Merge pull request #52 from lbryio/ittt

Merge months of work including all sort of caches and O_DIRECT optimizations

cmd/cluster.go

@@ -7,6 +7,7 @@ import (
 	"syscall"
 
 	"github.com/lbryio/lbry.go/v2/extras/crypto"
+
 	"github.com/lbryio/reflector.go/cluster"
 
 	log "github.com/sirupsen/logrus"

cmd/decode.go

@@ -7,7 +7,7 @@ import (
 	"github.com/lbryio/lbry.go/v2/schema/stake"
 
 	"github.com/davecgh/go-spew/spew"
-	"github.com/golang/protobuf/jsonpb"
+	"github.com/gogo/protobuf/jsonpb"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )

cmd/getstream.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"time"
 
-	"github.com/lbryio/reflector.go/peer"
+	"github.com/lbryio/reflector.go/server/peer"
 	"github.com/lbryio/reflector.go/store"
 
 	"github.com/lbryio/lbry.go/v2/stream"
@@ -41,7 +41,7 @@ func getStreamCmd(cmd *cobra.Command, args []string) {
 
 	var sd stream.SDBlob
 
-	sdb, err := s.Get(sdHash)
+	sdb, _, err := s.Get(sdHash)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -62,7 +62,7 @@ func getStreamCmd(cmd *cobra.Command, args []string) {
 	}
 
 	for i := 0; i < len(sd.BlobInfos)-1; i++ {
-		b, err := s.Get(hex.EncodeToString(sd.BlobInfos[i].BlobHash))
+		b, _, err := s.Get(hex.EncodeToString(sd.BlobInfos[i].BlobHash))
 		if err != nil {
 			log.Fatal(err)
 		}

cmd/integrity.go

@@ -0,0 +1,94 @@
+package cmd
+
+import (
+	"crypto/sha512"
+	"encoding/hex"
+	"io/ioutil"
+	"os"
+	"path"
+	"runtime"
+	"sync/atomic"
+	"time"
+
+	"github.com/lbryio/reflector.go/meta"
+	"github.com/lbryio/reflector.go/store/speedwalk"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+var threads int
+
+func init() {
+	var cmd = &cobra.Command{
+		Use:   "check-integrity",
+		Short: "check blobs integrity for a given path",
+		Run:   integrityCheckCmd,
+	}
+	cmd.Flags().StringVar(&diskStorePath, "store-path", "", "path of the store where all blobs are cached")
+	cmd.Flags().IntVar(&threads, "threads", runtime.NumCPU()-1, "number of concurrent threads to process blobs")
+	rootCmd.AddCommand(cmd)
+}
+
+func integrityCheckCmd(cmd *cobra.Command, args []string) {
+	log.Printf("reflector %s", meta.VersionString())
+	if diskStorePath == "" {
+		log.Fatal("store-path must be defined")
+	}
+
+	blobs, err := speedwalk.AllFiles(diskStorePath, true)
+	if err != nil {
+		log.Fatalf("error while reading blobs from disk %s", errors.FullTrace(err))
+	}
+	tasks := make(chan string, len(blobs))
+	done := make(chan bool)
+	processed := new(int32)
+	go produce(tasks, blobs)
+	cpus := runtime.NumCPU()
+	for i := 0; i < cpus-1; i++ {
+		go consume(i, tasks, done, len(blobs), processed)
+	}
+	<-done
+}
+
+func produce(tasks chan<- string, blobs []string) {
+	for _, b := range blobs {
+		tasks <- b
+	}
+	close(tasks)
+}
+
+func consume(worker int, tasks <-chan string, done chan<- bool, totalTasks int, processed *int32) {
+	start := time.Now()
+
+	for b := range tasks {
+		processedSoFar := atomic.AddInt32(processed, 1)
+		if worker == 0 {
+			remaining := int32(totalTasks) - processedSoFar
+			timePerBlob := time.Since(start).Microseconds() / int64(processedSoFar)
+			remainingTime := time.Duration(int64(remaining)*timePerBlob) * time.Microsecond
+			log.Infof("[T%d] %d/%d blobs processed so far. ETA: %s", worker, processedSoFar, totalTasks, remainingTime.String())
+		}
+		blobPath := path.Join(diskStorePath, b[:2], b)
+		blob, err := ioutil.ReadFile(blobPath)
+		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			}
+			log.Errorf("[Worker %d] Error looking up blob %s: %s", worker, b, err.Error())
+			continue
+		}
+		hashBytes := sha512.Sum384(blob)
+		readHash := hex.EncodeToString(hashBytes[:])
+		if readHash != b {
+			log.Infof("[%s] found a broken blob while reading from disk. Actual hash: %s", b, readHash)
+			err := os.Remove(blobPath)
+			if err != nil {
+				log.Errorf("Error while deleting broken blob %s: %s", b, err.Error())
+			}
+		}
+	}
+	done <- true
+}

cmd/peer.go

@@ -7,7 +7,7 @@ import (
 	"syscall"
 
 	"github.com/lbryio/reflector.go/db"
-	"github.com/lbryio/reflector.go/peer"
+	"github.com/lbryio/reflector.go/server/peer"
 	"github.com/lbryio/reflector.go/store"
 
 	log "github.com/sirupsen/logrus"
@@ -33,11 +33,13 @@ func peerCmd(cmd *cobra.Command, args []string) {
 	peerServer := peer.NewServer(s3)
 
 	if !peerNoDB {
-		db := new(db.SQL)
+		db := &db.SQL{
+			LogQueries: log.GetLevel() == log.DebugLevel,
+		}
 		err = db.Connect(globalConfig.DBConn)
 		checkErr(err)
 
-		combo := store.NewDBBackedStore(s3, db)
+		combo := store.NewDBBackedStore(s3, db, false)
 		peerServer = peer.NewServer(combo)
 	}
 

cmd/populatedb.go

@@ -0,0 +1,51 @@
+package cmd
+
+import (
+	"github.com/lbryio/reflector.go/db"
+	"github.com/lbryio/reflector.go/meta"
+	"github.com/lbryio/reflector.go/store/speedwalk"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+var (
+	diskStorePath string
+)
+
+func init() {
+	var cmd = &cobra.Command{
+		Use:   "populate-db",
+		Short: "populate local database with blobs from a disk storage",
+		Run:   populateDbCmd,
+	}
+	cmd.Flags().StringVar(&diskStorePath, "store-path", "",
+		"path of the store where all blobs are cached")
+	rootCmd.AddCommand(cmd)
+}
+
+func populateDbCmd(cmd *cobra.Command, args []string) {
+	log.Printf("reflector %s", meta.VersionString())
+	if diskStorePath == "" {
+		log.Fatal("store-path must be defined")
+	}
+	localDb := &db.SQL{
+		SoftDelete:  true,
+		TrackAccess: db.TrackAccessBlobs,
+		LogQueries:  log.GetLevel() == log.DebugLevel,
+	}
+	err := localDb.Connect("reflector:reflector@tcp(localhost:3306)/reflector")
+	if err != nil {
+		log.Fatal(err)
+	}
+	blobs, err := speedwalk.AllFiles(diskStorePath, true)
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = localDb.AddBlobs(blobs)
+	if err != nil {
+		log.Errorf("error while storing to db: %s", errors.FullTrace(err))
+	}
+}

cmd/reflector.go

@@ -8,34 +8,62 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/lbryio/lbry.go/v2/extras/util"
 	"github.com/lbryio/reflector.go/db"
 	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/meta"
-	"github.com/lbryio/reflector.go/peer"
-	"github.com/lbryio/reflector.go/peer/http3"
 	"github.com/lbryio/reflector.go/reflector"
+	"github.com/lbryio/reflector.go/server/http"
+	http32 "github.com/lbryio/reflector.go/server/http3"
+	"github.com/lbryio/reflector.go/server/peer"
 	"github.com/lbryio/reflector.go/store"
 
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	"github.com/lbryio/lbry.go/v2/extras/stop"
+	"github.com/lbryio/lbry.go/v2/stream"
+
+	"github.com/c2h5oh/datasize"
 	log "github.com/sirupsen/logrus"
-	"github.com/spf13/cast"
 	"github.com/spf13/cobra"
 )
 
 var (
-	tcpPeerPort           int
+	//port configuration
-	http3PeerPort         int
+	tcpPeerPort   int
-	receiverPort          int
+	http3PeerPort int
-	metricsPort           int
+	httpPeerPort  int
-	disableUploads        bool
+	receiverPort  int
-	disableBlocklist      bool
+	metricsPort   int
-	proxyAddress          string
+
-	proxyPort             string
+	//flags configuration
-	proxyProtocol         string
+	disableUploads   bool
-	useDB                 bool
+	disableBlocklist bool
-	cloudFrontEndpoint    string
+	useDB            bool
-	reflectorCmdDiskCache string
+
-	reflectorCmdMemCache  int
+	//upstream configuration
+	upstreamReflector string
+	upstreamProtocol  string
+
+	//downstream configuration
+	requestQueueSize int
+
+	//upstream edge configuration (to "cold" storage)
+	originEndpoint         string
+	originEndpointFallback string
+
+	//cache configuration
+	diskCache          string
+	secondaryDiskCache string
+	memCache           int
 )
+var cacheManagers = []string{"localdb", "lfu", "arc", "lru", "simple"}
+
+var cacheMangerToGcache = map[string]store.EvictionStrategy{
+	"lfu":    store.LFU,
+	"arc":    store.ARC,
+	"lru":    store.LRU,
+	"simple": store.SIMPLE,
+}
 
 func init() {
 	var cmd = &cobra.Command{
@@ -43,20 +71,29 @@ func init() {
 		Short: "Run reflector server",
 		Run:   reflectorCmd,
 	}
-	cmd.Flags().StringVar(&proxyAddress, "proxy-address", "", "address of another reflector server where blobs are fetched from")
+
-	cmd.Flags().StringVar(&proxyPort, "proxy-port", "5567", "port of another reflector server where blobs are fetched from")
+	cmd.Flags().IntVar(&tcpPeerPort, "tcp-peer-port", 5567, "The port reflector will distribute content from for the TCP (LBRY) protocol")
-	cmd.Flags().StringVar(&proxyProtocol, "proxy-protocol", "http3", "protocol used to fetch blobs from another reflector server (tcp/http3)")
-	cmd.Flags().StringVar(&cloudFrontEndpoint, "cloudfront-endpoint", "", "CloudFront edge endpoint for standard HTTP retrieval")
-	cmd.Flags().IntVar(&tcpPeerPort, "tcp-peer-port", 5567, "The port reflector will distribute content from")
 	cmd.Flags().IntVar(&http3PeerPort, "http3-peer-port", 5568, "The port reflector will distribute content from over HTTP3 protocol")
+	cmd.Flags().IntVar(&httpPeerPort, "http-peer-port", 5569, "The port reflector will distribute content from over HTTP protocol")
 	cmd.Flags().IntVar(&receiverPort, "receiver-port", 5566, "The port reflector will receive content from")
-	cmd.Flags().IntVar(&metricsPort, "metrics-port", 2112, "The port reflector will use for metrics")
+	cmd.Flags().IntVar(&metricsPort, "metrics-port", 2112, "The port reflector will use for prometheus metrics")
+
 	cmd.Flags().BoolVar(&disableUploads, "disable-uploads", false, "Disable uploads to this reflector server")
 	cmd.Flags().BoolVar(&disableBlocklist, "disable-blocklist", false, "Disable blocklist watching/updating")
-	cmd.Flags().BoolVar(&useDB, "use-db", true, "whether to connect to the reflector db or not")
+	cmd.Flags().BoolVar(&useDB, "use-db", true, "Whether to connect to the reflector db or not")
-	cmd.Flags().StringVar(&reflectorCmdDiskCache, "disk-cache", "",
+
-		"enable disk cache, setting max size and path where to store blobs. format is 'MAX_BLOBS:CACHE_PATH'")
+	cmd.Flags().StringVar(&upstreamReflector, "upstream-reflector", "", "host:port of a reflector server where blobs are fetched from")
-	cmd.Flags().IntVar(&reflectorCmdMemCache, "mem-cache", 0, "enable in-memory cache with a max size of this many blobs")
+	cmd.Flags().StringVar(&upstreamProtocol, "upstream-protocol", "http", "protocol used to fetch blobs from another upstream reflector server (tcp/http3/http)")
+
+	cmd.Flags().IntVar(&requestQueueSize, "request-queue-size", 200, "How many concurrent requests from downstream should be handled at once (the rest will wait)")
+
+	cmd.Flags().StringVar(&originEndpoint, "origin-endpoint", "", "HTTP edge endpoint for standard HTTP retrieval")
+	cmd.Flags().StringVar(&originEndpointFallback, "origin-endpoint-fallback", "", "HTTP edge endpoint for standard HTTP retrieval if first origin fails")
+
+	cmd.Flags().StringVar(&diskCache, "disk-cache", "100GB:/tmp/downloaded_blobs:localdb", "Where to cache blobs on the file system. format is 'sizeGB:CACHE_PATH:cachemanager' (cachemanagers: localdb/lfu/arc/lru)")
+	cmd.Flags().StringVar(&secondaryDiskCache, "optional-disk-cache", "", "Optional secondary file system cache for blobs. format is 'sizeGB:CACHE_PATH:cachemanager' (cachemanagers: localdb/lfu/arc/lru) (this would get hit before the one specified in disk-cache)")
+	cmd.Flags().IntVar(&memCache, "mem-cache", 0, "enable in-memory cache with a max size of this many blobs")
+
 	rootCmd.AddCommand(cmd)
 }
 
@@ -64,11 +101,11 @@ func reflectorCmd(cmd *cobra.Command, args []string) {
 	log.Printf("reflector %s", meta.VersionString())
 
 	// the blocklist logic requires the db backed store to be the outer-most store
-	underlyingStore := setupStore()
+	underlyingStore := initStores()
-	outerStore := wrapWithCache(underlyingStore)
+	underlyingStoreWithCaches, cleanerStopper := initCaches(underlyingStore)
 
 	if !disableUploads {
-		reflectorServer := reflector.NewServer(underlyingStore)
+		reflectorServer := reflector.NewServer(underlyingStore, underlyingStoreWithCaches)
 		reflectorServer.Timeout = 3 * time.Minute
 		reflectorServer.EnableBlocklist = !disableBlocklist
 
@@ -79,117 +116,264 @@ func reflectorCmd(cmd *cobra.Command, args []string) {
 		defer reflectorServer.Shutdown()
 	}
 
-	peerServer := peer.NewServer(outerStore)
+	peerServer := peer.NewServer(underlyingStoreWithCaches)
 	err := peerServer.Start(":" + strconv.Itoa(tcpPeerPort))
 	if err != nil {
 		log.Fatal(err)
 	}
 	defer peerServer.Shutdown()
 
-	http3PeerServer := http3.NewServer(outerStore)
+	http3PeerServer := http32.NewServer(underlyingStoreWithCaches, requestQueueSize)
 	err = http3PeerServer.Start(":" + strconv.Itoa(http3PeerPort))
 	if err != nil {
 		log.Fatal(err)
 	}
 	defer http3PeerServer.Shutdown()
 
+	httpServer := http.NewServer(underlyingStoreWithCaches, requestQueueSize)
+	err = httpServer.Start(":" + strconv.Itoa(httpPeerPort))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer httpServer.Shutdown()
+
 	metricsServer := metrics.NewServer(":"+strconv.Itoa(metricsPort), "/metrics")
 	metricsServer.Start()
 	defer metricsServer.Shutdown()
+	defer underlyingStoreWithCaches.Shutdown()
+	defer underlyingStore.Shutdown() //do we actually need this? Oo
 
 	interruptChan := make(chan os.Signal, 1)
 	signal.Notify(interruptChan, os.Interrupt, syscall.SIGTERM)
 	<-interruptChan
 	// deferred shutdowns happen now
+	cleanerStopper.StopAndWait()
 }
 
-func setupStore() store.BlobStore {
+func initUpstreamStore() store.BlobStore {
+	var s store.BlobStore
+	if upstreamReflector == "" {
+		return nil
+	}
+	switch upstreamProtocol {
+	case "tcp":
+		s = peer.NewStore(peer.StoreOpts{
+			Address: upstreamReflector,
+			Timeout: 30 * time.Second,
+		})
+	case "http3":
+		s = http32.NewStore(http32.StoreOpts{
+			Address: upstreamReflector,
+			Timeout: 30 * time.Second,
+		})
+	case "http":
+		s = store.NewHttpStore(upstreamReflector)
+	default:
+		log.Fatalf("protocol is not recognized: %s", upstreamProtocol)
+	}
+	return s
+}
+func initEdgeStore() store.BlobStore {
+	var s3Store *store.S3Store
 	var s store.BlobStore
 
-	if proxyAddress != "" {
+	if conf != "none" {
-		switch proxyProtocol {
+		s3Store = store.NewS3Store(globalConfig.AwsID, globalConfig.AwsSecret, globalConfig.BucketRegion, globalConfig.BucketName)
-		case "tcp":
+	}
-			s = peer.NewStore(peer.StoreOpts{
+	if originEndpointFallback != "" && originEndpoint != "" {
-				Address: proxyAddress + ":" + proxyPort,
+		ittt := store.NewITTTStore(store.NewCloudFrontROStore(originEndpoint), store.NewCloudFrontROStore(originEndpointFallback))
-				Timeout: 30 * time.Second,
+		if s3Store != nil {
-			})
+			s = store.NewCloudFrontRWStore(ittt, s3Store)
-		case "http3":
-			s = http3.NewStore(http3.StoreOpts{
-				Address: proxyAddress + ":" + proxyPort,
-				Timeout: 30 * time.Second,
-			})
-		default:
-			log.Fatalf("protocol is not recognized: %s", proxyProtocol)
-		}
-	} else {
-		s3Store := store.NewS3Store(globalConfig.AwsID, globalConfig.AwsSecret, globalConfig.BucketRegion, globalConfig.BucketName)
-		if cloudFrontEndpoint != "" {
-			s = store.NewCloudFrontRWStore(store.NewCloudFrontROStore(cloudFrontEndpoint), s3Store)
 		} else {
-			s = s3Store
+			s = ittt
 		}
+	} else if s3Store != nil {
+		s = s3Store
+	} else {
+		log.Fatalf("this configuration does not include a valid upstream source")
 	}
-
-	if useDB {
-		db := new(db.SQL)
-		db.TrackAccessTime = true
-		err := db.Connect(globalConfig.DBConn)
-		if err != nil {
-			log.Fatal(err)
-		}
-
-		s = store.NewDBBackedStore(s, db)
-	}
-
 	return s
 }
 
-func wrapWithCache(s store.BlobStore) store.BlobStore {
+func initDBStore(s store.BlobStore) store.BlobStore {
-	wrapped := s
+	if useDB {
-
+		dbInst := &db.SQL{
-	diskCacheMaxSize, diskCachePath := diskCacheParams()
+			TrackAccess: db.TrackAccessStreams,
-	if diskCacheMaxSize > 0 {
+			LogQueries:  log.GetLevel() == log.DebugLevel,
-		err := os.MkdirAll(diskCachePath, os.ModePerm)
+		}
+		err := dbInst.Connect(globalConfig.DBConn)
 		if err != nil {
 			log.Fatal(err)
 		}
-		wrapped = store.NewCachingStore(
+		s = store.NewDBBackedStore(s, dbInst, false)
+	}
+	return s
+}
+
+func initStores() store.BlobStore {
+	s := initUpstreamStore()
+	if s == nil {
+		s = initEdgeStore()
+	}
+	s = initDBStore(s)
+	return s
+}
+
+// initCaches returns a store wrapped with caches and a stop group to execute a clean shutdown
+func initCaches(s store.BlobStore) (store.BlobStore, *stop.Group) {
+	stopper := stop.New()
+	diskStore := initDiskStore(s, diskCache, stopper)
+	finalStore := initDiskStore(diskStore, secondaryDiskCache, stopper)
+	stop.New()
+	if memCache > 0 {
+		finalStore = store.NewCachingStore(
 			"reflector",
-			wrapped,
+			finalStore,
-			store.NewLRUStore("peer_server", store.NewDiskStore(diskCachePath, 2), diskCacheMaxSize),
+			store.NewGcacheStore("mem", store.NewMemStore(), memCache, store.LRU),
 		)
 	}
+	return finalStore, stopper
+}
 
-	if reflectorCmdMemCache > 0 {
+func initDiskStore(upstreamStore store.BlobStore, diskParams string, stopper *stop.Group) store.BlobStore {
-		wrapped = store.NewCachingStore(
+	diskCacheMaxSize, diskCachePath, cacheManager := diskCacheParams(diskParams)
-			"reflector",
+	//we are tracking blobs in memory with a 1 byte long boolean, which means that for each 2MB (a blob) we need 1Byte
-			wrapped,
+	// so if the underlying cache holds 10MB, 10MB/2MB=5Bytes which is also the exact count of objects to restore on startup
-			store.NewLRUStore("peer_server", store.NewMemStore(), reflectorCmdMemCache),
+	realCacheSize := float64(diskCacheMaxSize) / float64(stream.MaxBlobSize)
-		)
+	if diskCacheMaxSize == 0 {
+		return upstreamStore
+	}
+	err := os.MkdirAll(diskCachePath, os.ModePerm)
+	if err != nil {
+		log.Fatal(err)
 	}
 
+	diskStore := store.NewDiskStore(diskCachePath, 2)
+	var unwrappedStore store.BlobStore
+	cleanerStopper := stop.New(stopper)
+
+	if cacheManager == "localdb" {
+		localDb := &db.SQL{
+			SoftDelete:  true,
+			TrackAccess: db.TrackAccessBlobs,
+			LogQueries:  log.GetLevel() == log.DebugLevel,
+		}
+		err = localDb.Connect("reflector:reflector@tcp(localhost:3306)/reflector")
+		if err != nil {
+			log.Fatal(err)
+		}
+		unwrappedStore = store.NewDBBackedStore(diskStore, localDb, true)
+		go cleanOldestBlobs(int(realCacheSize), localDb, unwrappedStore, cleanerStopper)
+	} else {
+		unwrappedStore = store.NewGcacheStore("nvme", store.NewDiskStore(diskCachePath, 2), int(realCacheSize), cacheMangerToGcache[cacheManager])
+	}
+
+	wrapped := store.NewCachingStore(
+		"reflector",
+		upstreamStore,
+		unwrappedStore,
+	)
 	return wrapped
 }
 
-func diskCacheParams() (int, string) {
+func diskCacheParams(diskParams string) (int, string, string) {
-	if reflectorCmdDiskCache == "" {
+	if diskParams == "" {
-		return 0, ""
+		return 0, "", ""
 	}
 
-	parts := strings.Split(reflectorCmdDiskCache, ":")
+	parts := strings.Split(diskParams, ":")
-	if len(parts) != 2 {
+	if len(parts) != 3 {
-		log.Fatalf("--disk-cache must be a number, followed by ':', followed by a string")
+		log.Fatalf("%s does is formatted incorrectly. Expected format: 'sizeGB:CACHE_PATH:cachemanager' for example: '100GB:/tmp/downloaded_blobs:localdb'", diskParams)
-	}
-
-	maxSize := cast.ToInt(parts[0])
-	if maxSize <= 0 {
-		log.Fatalf("--disk-cache max size must be more than 0")
 	}
 
+	diskCacheSize := parts[0]
 	path := parts[1]
+	cacheManager := parts[2]
+
 	if len(path) == 0 || path[0] != '/' {
-		log.Fatalf("--disk-cache path must start with '/'")
+		log.Fatalf("disk cache paths must start with '/'")
 	}
 
-	return maxSize, path
+	if !util.InSlice(cacheManager, cacheManagers) {
+		log.Fatalf("specified cache manager '%s' is not supported. Use one of the following: %v", cacheManager, cacheManagers)
+	}
+
+	var maxSize datasize.ByteSize
+	err := maxSize.UnmarshalText([]byte(diskCacheSize))
+	if err != nil {
+		log.Fatal(err)
+	}
+	if maxSize <= 0 {
+		log.Fatal("disk cache size must be more than 0")
+	}
+	return int(maxSize), path, cacheManager
+}
+
+func cleanOldestBlobs(maxItems int, db *db.SQL, store store.BlobStore, stopper *stop.Group) {
+	// this is so that it runs on startup without having to wait for 10 minutes
+	err := doClean(maxItems, db, store, stopper)
+	if err != nil {
+		log.Error(errors.FullTrace(err))
+	}
+	const cleanupInterval = 10 * time.Minute
+	for {
+		select {
+		case <-stopper.Ch():
+			log.Infoln("stopping self cleanup")
+			return
+		case <-time.After(cleanupInterval):
+			err := doClean(maxItems, db, store, stopper)
+			if err != nil {
+				log.Error(errors.FullTrace(err))
+			}
+		}
+	}
+}
+
+func doClean(maxItems int, db *db.SQL, store store.BlobStore, stopper *stop.Group) error {
+	blobsCount, err := db.Count()
+	if err != nil {
+		return err
+	}
+
+	if blobsCount >= maxItems {
+		itemsToDelete := blobsCount / 10
+		blobs, err := db.LeastRecentlyAccessedHashes(itemsToDelete)
+		if err != nil {
+			return err
+		}
+		blobsChan := make(chan string, len(blobs))
+		wg := &stop.Group{}
+		go func() {
+			for _, hash := range blobs {
+				select {
+				case <-stopper.Ch():
+					return
+				default:
+				}
+				blobsChan <- hash
+			}
+			close(blobsChan)
+		}()
+		for i := 0; i < 3; i++ {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				for h := range blobsChan {
+					select {
+					case <-stopper.Ch():
+						return
+					default:
+					}
+					err = store.Delete(h)
+					if err != nil {
+						log.Errorf("error pruning %s: %s", h, errors.FullTrace(err))
+						continue
+					}
+				}
+			}()
+		}
+		wg.Wait()
+	}
+	return nil
 }

cmd/root.go

@@ -6,10 +6,11 @@ import (
 	"os"
 	"strings"
 
+	"github.com/lbryio/reflector.go/updater"
+
 	"github.com/lbryio/lbry.go/v2/dht"
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/extras/util"
-	"github.com/lbryio/reflector.go/updater"
 
 	"github.com/johntdyer/slackrus"
 	"github.com/sirupsen/logrus"
@@ -164,8 +165,8 @@ func mustGetFlagInt64(cmd *cobra.Command, name string) int64 {
 	return v
 }
 
-func mustGetFlagBool(cmd *cobra.Command, name string) bool {
+//func mustGetFlagBool(cmd *cobra.Command, name string) bool {
-	v, err := cmd.Flags().GetBool(name)
+//	v, err := cmd.Flags().GetBool(name)
-	checkErr(err)
+//	checkErr(err)
-	return v
+//	return v
-}
+//}

cmd/start.go

@@ -7,15 +7,16 @@ import (
 	"strings"
 	"syscall"
 
-	"github.com/lbryio/lbry.go/v2/dht"
-	"github.com/lbryio/lbry.go/v2/dht/bits"
 	"github.com/lbryio/reflector.go/cluster"
 	"github.com/lbryio/reflector.go/db"
-	"github.com/lbryio/reflector.go/peer"
 	"github.com/lbryio/reflector.go/prism"
 	"github.com/lbryio/reflector.go/reflector"
+	"github.com/lbryio/reflector.go/server/peer"
 	"github.com/lbryio/reflector.go/store"
 
+	"github.com/lbryio/lbry.go/v2/dht"
+	"github.com/lbryio/lbry.go/v2/dht/bits"
+
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
@@ -52,11 +53,13 @@ func init() {
 }
 
 func startCmd(cmd *cobra.Command, args []string) {
-	db := new(db.SQL)
+	db := &db.SQL{
+		LogQueries: log.GetLevel() == log.DebugLevel,
+	}
 	err := db.Connect(globalConfig.DBConn)
 	checkErr(err)
 	s3 := store.NewS3Store(globalConfig.AwsID, globalConfig.AwsSecret, globalConfig.BucketRegion, globalConfig.BucketName)
-	comboStore := store.NewDBBackedStore(s3, db)
+	comboStore := store.NewDBBackedStore(s3, db, false)
 
 	conf := prism.DefaultConf()
 

cmd/test.go

@@ -9,8 +9,8 @@ import (
 	"time"
 
 	"github.com/lbryio/reflector.go/meta"
-	"github.com/lbryio/reflector.go/peer"
 	"github.com/lbryio/reflector.go/reflector"
+	"github.com/lbryio/reflector.go/server/peer"
 	"github.com/lbryio/reflector.go/store"
 
 	log "github.com/sirupsen/logrus"
@@ -31,7 +31,7 @@ func testCmd(cmd *cobra.Command, args []string) {
 
 	memStore := store.NewMemStore()
 
-	reflectorServer := reflector.NewServer(memStore)
+	reflectorServer := reflector.NewServer(memStore, memStore)
 	reflectorServer.Timeout = 3 * time.Minute
 
 	err := reflectorServer.Start(":" + strconv.Itoa(reflector.DefaultPort))

cmd/upload.go

@@ -9,6 +9,7 @@ import (
 	"github.com/lbryio/reflector.go/reflector"
 	"github.com/lbryio/reflector.go/store"
 
+	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
 
@@ -30,13 +31,15 @@ func init() {
 }
 
 func uploadCmd(cmd *cobra.Command, args []string) {
-	db := new(db.SQL)
+	db := &db.SQL{
+		LogQueries: log.GetLevel() == log.DebugLevel,
+	}
 	err := db.Connect(globalConfig.DBConn)
 	checkErr(err)
 
 	st := store.NewDBBackedStore(
 		store.NewS3Store(globalConfig.AwsID, globalConfig.AwsSecret, globalConfig.BucketRegion, globalConfig.BucketName),
-		db)
+		db, false)
 
 	uploader := reflector.NewUploader(db, st, uploadWorkers, uploadSkipExistsCheck, uploadDeleteBlobsAfterUpload)
 

cmd/version.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/lbryio/reflector.go/meta"
+
 	"github.com/spf13/cobra"
 )
 

db/db.go

@@ -3,16 +3,22 @@ package db
 import (
 	"context"
 	"database/sql"
+	"fmt"
+	"runtime"
+	"strings"
 	"time"
 
 	"github.com/lbryio/lbry.go/v2/dht/bits"
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	qt "github.com/lbryio/lbry.go/v2/extras/query"
+	"github.com/lbryio/lbry.go/v2/extras/stop"
+	"github.com/lbryio/lbry.go/v2/stream"
 
 	"github.com/go-sql-driver/mysql"
 	_ "github.com/go-sql-driver/mysql" // blank import for db driver ensures its imported even if its not used
 	log "github.com/sirupsen/logrus"
 	"github.com/volatiletech/null"
+	"go.uber.org/atomic"
 )
 
 // SdBlob is a special blob that contains information on the rest of the blobs in the stream
@@ -30,19 +36,38 @@ type SdBlob struct {
 	StreamHash        string `json:"stream_hash"`
 }
 
+type trackAccess int
+
+const (
+	TrackAccessNone    trackAccess = iota // Don't track accesses
+	TrackAccessStreams                    // Track accesses at the stream level
+	TrackAccessBlobs                      // Track accesses at the blob level
+)
+
 // SQL implements the DB interface
 type SQL struct {
 	conn *sql.DB
 
-	TrackAccessTime bool
+	// Track the approx last time a blob or stream was accessed
+	TrackAccess trackAccess
+
+	// Instead of deleting a blob, marked it as not stored in the db
+	SoftDelete bool
+
+	// Log executed queries. qt.InterpolateParams is cpu-heavy. This avoids that call if not needed.
+	LogQueries bool
 }
 
-func logQuery(query string, args ...interface{}) {
+func (s SQL) logQuery(query string, args ...interface{}) {
-	s, err := qt.InterpolateParams(query, args...)
+	if !s.LogQueries {
+		return
+	}
+
+	qStr, err := qt.InterpolateParams(query, args...)
 	if err != nil {
 		log.Errorln(err)
 	} else {
-		log.Debugln(s)
+		log.Debugln(qStr)
 	}
 }
 
@@ -73,16 +98,97 @@ func (s *SQL) AddBlob(hash string, length int, isStored bool) error {
 	return err
 }
 
+//AddBlobs adds blobs to the database.
+func (s *SQL) AddBlobs(hash []string) error {
+	if s.conn == nil {
+		return errors.Err("not connected")
+	}
+
+	batch := 10000
+	totalBlobs := int64(len(hash))
+	work := make(chan []string, 1000)
+	stopper := stop.New()
+	var totalInserted atomic.Int64
+	start := time.Now()
+
+	go func() {
+		for i := 0; i < len(hash); i += batch {
+			j := i + batch
+			if j > len(hash) {
+				j = len(hash)
+			}
+			work <- hash[i:j]
+		}
+		log.Infof("done loading %d hashes in the work queue", len(hash))
+		close(work)
+	}()
+
+	for i := 0; i < runtime.NumCPU(); i++ {
+		stopper.Add(1)
+		go func(worker int) {
+			log.Infof("starting worker %d", worker)
+			defer stopper.Done()
+			for hashes := range work {
+				inserted := totalInserted.Load()
+				remaining := totalBlobs - inserted
+				if inserted > 0 {
+					timePerBlob := time.Since(start).Microseconds() / inserted
+					remainingTime := time.Duration(remaining*timePerBlob) * time.Microsecond
+					log.Infof("[T%d] processing batch of %d items. ETA: %s", worker, len(hashes), remainingTime.String())
+				}
+				err := s.insertBlobs(hashes) // Process the batch.
+				if err != nil {
+					log.Errorf("error while inserting batch: %s", errors.FullTrace(err))
+				}
+				totalInserted.Add(int64(len(hashes)))
+			}
+		}(i)
+	}
+
+	stopper.Wait()
+	return nil
+}
+
+func (s *SQL) insertBlobs(hashes []string) error {
+	var (
+		q string
+		//args []interface{}
+	)
+	dayAgo := time.Now().AddDate(0, 0, -1).Format("2006-01-02 15:04:05")
+	q = "insert into blob_ (hash, is_stored, length, last_accessed_at) values "
+	for _, hash := range hashes {
+		// prepared statements slow everything down by a lot due to reflection
+		// for this specific instance we'll go ahead and hardcode the query to make it go faster
+		q += fmt.Sprintf("('%s',1,%d,'%s'),", hash, stream.MaxBlobSize, dayAgo)
+		//args = append(args, hash, true, stream.MaxBlobSize, dayAgo)
+	}
+	q = strings.TrimSuffix(q, ",")
+	_, err := s.exec(q)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (s *SQL) insertBlob(hash string, length int, isStored bool) (int64, error) {
 	if length <= 0 {
 		return 0, errors.Err("length must be positive")
 	}
 
-	args := []interface{}{hash, isStored, length}
+	var (
-	blobID, err := s.exec(
+		q    string
-		"INSERT INTO blob_ (hash, is_stored, length) VALUES ("+qt.Qs(len(args))+") ON DUPLICATE KEY UPDATE is_stored = (is_stored or VALUES(is_stored))",
+		args []interface{}
-		args...,
 	)
+	if s.TrackAccess == TrackAccessBlobs {
+		args = []interface{}{hash, isStored, length, time.Now()}
+		q = "INSERT INTO blob_ (hash, is_stored, length, last_accessed_at) VALUES (" + qt.Qs(len(args)) + ") ON DUPLICATE KEY UPDATE is_stored = (is_stored or VALUES(is_stored)), last_accessed_at = VALUES(last_accessed_at)"
+	} else {
+		args = []interface{}{hash, isStored, length}
+		q = "INSERT INTO blob_ (hash, is_stored, length) VALUES (" + qt.Qs(len(args)) + ") ON DUPLICATE KEY UPDATE is_stored = (is_stored or VALUES(is_stored))"
+	}
+
+	blobID, err := s.exec(q, args...)
 	if err != nil {
 		return 0, err
 	}
@@ -95,17 +201,33 @@ func (s *SQL) insertBlob(hash string, length int, isStored bool) (int64, error)
 		if blobID == 0 {
 			return 0, errors.Err("blob ID is 0 even after INSERTing and SELECTing")
 		}
+
+		if s.TrackAccess == TrackAccessBlobs {
+			err := s.touchBlobs([]uint64{uint64(blobID)})
+			if err != nil {
+				return 0, errors.Err(err)
+			}
+		}
 	}
 
 	return blobID, nil
 }
 
 func (s *SQL) insertStream(hash string, sdBlobID int64) (int64, error) {
-	args := []interface{}{hash, sdBlobID, time.Now()}
+	var (
-	streamID, err := s.exec(
+		q    string
-		"INSERT IGNORE INTO stream (hash, sd_blob_id, last_accessed_at) VALUES ("+qt.Qs(len(args))+")",
+		args []interface{}
-		args...,
 	)
+
+	if s.TrackAccess == TrackAccessStreams {
+		args = []interface{}{hash, sdBlobID, time.Now()}
+		q = "INSERT IGNORE INTO stream (hash, sd_blob_id, last_accessed_at) VALUES (" + qt.Qs(len(args)) + ")"
+	} else {
+		args = []interface{}{hash, sdBlobID}
+		q = "INSERT IGNORE INTO stream (hash, sd_blob_id) VALUES (" + qt.Qs(len(args)) + ")"
+	}
+
+	streamID, err := s.exec(q, args...)
 	if err != nil {
 		return 0, errors.Err(err)
 	}
@@ -119,8 +241,8 @@ func (s *SQL) insertStream(hash string, sdBlobID int64) (int64, error) {
 			return 0, errors.Err("stream ID is 0 even after INSERTing and SELECTing")
 		}
 
-		if s.TrackAccessTime {
+		if s.TrackAccess == TrackAccessStreams {
-			err := s.touch([]uint64{uint64(streamID)})
+			err := s.touchStreams([]uint64{uint64(streamID)})
 			if err != nil {
 				return 0, errors.Err(err)
 			}
@@ -130,8 +252,8 @@ func (s *SQL) insertStream(hash string, sdBlobID int64) (int64, error) {
 }
 
 // HasBlob checks if the database contains the blob information.
-func (s *SQL) HasBlob(hash string) (bool, error) {
+func (s *SQL) HasBlob(hash string, touch bool) (bool, error) {
-	exists, err := s.HasBlobs([]string{hash})
+	exists, err := s.HasBlobs([]string{hash}, touch)
 	if err != nil {
 		return false, err
 	}
@@ -139,13 +261,39 @@ func (s *SQL) HasBlob(hash string) (bool, error) {
 }
 
 // HasBlobs checks if the database contains the set of blobs and returns a bool map.
-func (s *SQL) HasBlobs(hashes []string) (map[string]bool, error) {
+func (s *SQL) HasBlobs(hashes []string, touch bool) (map[string]bool, error) {
-	exists, streamsNeedingTouch, err := s.hasBlobs(hashes)
+	exists, idsNeedingTouch, err := s.hasBlobs(hashes)
-	s.touch(streamsNeedingTouch)
+
+	if touch {
+		if s.TrackAccess == TrackAccessBlobs {
+			_ = s.touchBlobs(idsNeedingTouch)
+		} else if s.TrackAccess == TrackAccessStreams {
+			_ = s.touchStreams(idsNeedingTouch)
+		}
+	}
+
 	return exists, err
 }
 
-func (s *SQL) touch(streamIDs []uint64) error {
+func (s *SQL) touchBlobs(blobIDs []uint64) error {
+	if len(blobIDs) == 0 {
+		return nil
+	}
+
+	query := "UPDATE blob_ SET last_accessed_at = ? WHERE id IN (" + qt.Qs(len(blobIDs)) + ")"
+	args := make([]interface{}, len(blobIDs)+1)
+	args[0] = time.Now()
+	for i := range blobIDs {
+		args[i+1] = blobIDs[i]
+	}
+
+	startTime := time.Now()
+	_, err := s.exec(query, args...)
+	log.Debugf("touched %d blobs and took %s", len(blobIDs), time.Since(startTime))
+	return errors.Err(err)
+}
+
+func (s *SQL) touchStreams(streamIDs []uint64) error {
 	if len(streamIDs) == 0 {
 		return nil
 	}
@@ -159,7 +307,7 @@ func (s *SQL) touch(streamIDs []uint64) error {
 
 	startTime := time.Now()
 	_, err := s.exec(query, args...)
-	log.Debugf("stream access query touched %d streams and took %s", len(streamIDs), time.Since(startTime))
+	log.Debugf("touched %d streams and took %s", len(streamIDs), time.Since(startTime))
 	return errors.Err(err)
 }
 
@@ -170,14 +318,15 @@ func (s *SQL) hasBlobs(hashes []string) (map[string]bool, []uint64, error) {
 
 	var (
 		hash           string
-		streamID       uint64
+		blobID         uint64
+		streamID       null.Uint64
 		lastAccessedAt null.Time
 	)
 
 	var needsTouch []uint64
 	exists := make(map[string]bool)
 
-	touchDeadline := time.Now().AddDate(0, 0, -1) // touch blob if last accessed before this time
+	touchDeadline := time.Now().Add(-6 * time.Hour) // touch blob if last accessed before this time
 	maxBatchSize := 10000
 	doneIndex := 0
 
@@ -189,20 +338,29 @@ func (s *SQL) hasBlobs(hashes []string) (map[string]bool, []uint64, error) {
 		log.Debugf("getting hashes[%d:%d] of %d", doneIndex, sliceEnd, len(hashes))
 		batch := hashes[doneIndex:sliceEnd]
 
-		// TODO: this query doesn't work for SD blobs, which are not in the stream_blob table
+		var query string
-
+		if s.TrackAccess == TrackAccessBlobs {
-		query := `SELECT b.hash, s.id, s.last_accessed_at
+			query = `SELECT b.hash, b.id, NULL, b.last_accessed_at
+FROM blob_ b
+WHERE b.is_stored = 1 and b.hash IN (` + qt.Qs(len(batch)) + `)`
+		} else if s.TrackAccess == TrackAccessStreams {
+			query = `SELECT b.hash, b.id, s.id, s.last_accessed_at
 FROM blob_ b
 LEFT JOIN stream_blob sb ON b.id = sb.blob_id
 INNER JOIN stream s on (sb.stream_id = s.id or s.sd_blob_id = b.id)
-WHERE b.is_stored = ? and b.hash IN (` + qt.Qs(len(batch)) + `)`
+WHERE b.is_stored = 1 and b.hash IN (` + qt.Qs(len(batch)) + `)`
-		args := make([]interface{}, len(batch)+1)
+		} else {
-		args[0] = true
+			query = `SELECT b.hash, b.id, NULL, NULL
-		for i := range batch {
+FROM blob_ b
-			args[i+1] = batch[i]
+WHERE b.is_stored = 1 and b.hash IN (` + qt.Qs(len(batch)) + `)`
 		}
 
-		logQuery(query, args...)
+		args := make([]interface{}, len(batch))
+		for i := range batch {
+			args[i] = batch[i]
+		}
+
+		s.logQuery(query, args...)
 
 		err := func() error {
 			startTime := time.Now()
@@ -214,13 +372,17 @@ WHERE b.is_stored = ? and b.hash IN (` + qt.Qs(len(batch)) + `)`
 			defer closeRows(rows)
 
 			for rows.Next() {
-				err := rows.Scan(&hash, &streamID, &lastAccessedAt)
+				err := rows.Scan(&hash, &blobID, &streamID, &lastAccessedAt)
 				if err != nil {
 					return errors.Err(err)
 				}
 				exists[hash] = true
-				if s.TrackAccessTime && (!lastAccessedAt.Valid || lastAccessedAt.Time.Before(touchDeadline)) {
+				if !lastAccessedAt.Valid || lastAccessedAt.Time.Before(touchDeadline) {
-					needsTouch = append(needsTouch, streamID)
+					if s.TrackAccess == TrackAccessBlobs {
+						needsTouch = append(needsTouch, blobID)
+					} else if s.TrackAccess == TrackAccessStreams && !streamID.IsZero() {
+						needsTouch = append(needsTouch, streamID.Uint64)
+					}
 				}
 			}
 
@@ -240,8 +402,14 @@ WHERE b.is_stored = ? and b.hash IN (` + qt.Qs(len(batch)) + `)`
 	return exists, needsTouch, nil
 }
 
-// Delete will remove the blob from the db
+// Delete will remove (or soft-delete) the blob from the db
+// NOTE: If SoftDelete is enabled, streams will never be deleted
 func (s *SQL) Delete(hash string) error {
+	if s.SoftDelete {
+		_, err := s.exec("UPDATE blob_ SET is_stored = 0 WHERE hash = ?", hash)
+		return errors.Err(err)
+	}
+
 	_, err := s.exec("DELETE FROM stream WHERE sd_blob_id = (SELECT id FROM blob_ WHERE hash = ?)", hash)
 	if err != nil {
 		return errors.Err(err)
@@ -251,11 +419,59 @@ func (s *SQL) Delete(hash string) error {
 	return errors.Err(err)
 }
 
+//LeastRecentlyAccessedHashes gets the least recently accessed blobs
+func (s *SQL) LeastRecentlyAccessedHashes(maxBlobs int) ([]string, error) {
+	if s.conn == nil {
+		return nil, errors.Err("not connected")
+	}
+
+	if s.TrackAccess != TrackAccessBlobs {
+		return nil, errors.Err("blob access tracking is disabled")
+	}
+
+	query := "SELECT hash from blob_ where is_stored = 1 order by last_accessed_at limit ?"
+	s.logQuery(query, maxBlobs)
+
+	rows, err := s.conn.Query(query, maxBlobs)
+	if err != nil {
+		return nil, errors.Err(err)
+	}
+	defer closeRows(rows)
+
+	blobs := make([]string, 0, maxBlobs)
+	for rows.Next() {
+		var hash string
+		err := rows.Scan(&hash)
+		if err != nil {
+			return nil, errors.Err(err)
+		}
+		blobs = append(blobs, hash)
+	}
+
+	return blobs, nil
+}
+
+func (s *SQL) Count() (int, error) {
+	if s.conn == nil {
+		return 0, errors.Err("not connected")
+	}
+
+	query := "SELECT count(id) from blob_"
+	if s.SoftDelete {
+		query += " where is_stored = 1"
+	}
+	s.logQuery(query)
+
+	var count int
+	err := s.conn.QueryRow(query).Scan(&count)
+	return count, errors.Err(err)
+}
+
 // Block will mark a blob as blocked
 func (s *SQL) Block(hash string) error {
 	query := "INSERT IGNORE INTO blocked SET hash = ?"
 	args := []interface{}{hash}
-	logQuery(query, args...)
+	s.logQuery(query, args...)
 	_, err := s.conn.Exec(query, args...)
 	return errors.Err(err)
 }
@@ -263,7 +479,7 @@ func (s *SQL) Block(hash string) error {
 // GetBlocked will return a list of blocked hashes
 func (s *SQL) GetBlocked() (map[string]bool, error) {
 	query := "SELECT hash FROM blocked"
-	logQuery(query)
+	s.logQuery(query)
 	rows, err := s.conn.Query(query)
 	if err != nil {
 		return nil, errors.Err(err)
@@ -306,7 +522,7 @@ func (s *SQL) MissingBlobsForKnownStream(sdHash string) ([]string, error) {
 	`
 	args := []interface{}{sdHash}
 
-	logQuery(query, args...)
+	s.logQuery(query, args...)
 
 	rows, err := s.conn.Query(query, args...)
 	if err != nil {
@@ -385,7 +601,7 @@ func (s *SQL) GetHashRange() (string, string, error) {
 
 	query := "SELECT MIN(hash), MAX(hash) from blob_"
 
-	logQuery(query)
+	s.logQuery(query)
 
 	err := s.conn.QueryRow(query).Scan(&min, &max)
 	return min, max, err
@@ -409,7 +625,7 @@ func (s *SQL) GetStoredHashesInRange(ctx context.Context, start, end bits.Bitmap
 		query := "SELECT hash FROM blob_ WHERE hash >= ? AND hash <= ? AND is_stored = 1"
 		args := []interface{}{start.Hex(), end.Hex()}
 
-		logQuery(query, args...)
+		s.logQuery(query, args...)
 
 		rows, err := s.conn.Query(query, args...)
 		defer closeRows(rows)
@@ -490,7 +706,7 @@ func closeRows(rows *sql.Rows) {
 }
 
 func (s *SQL) exec(query string, args ...interface{}) (int64, error) {
-	logQuery(query, args...)
+	s.logQuery(query, args...)
 	attempt, maxAttempts := 0, 3
 Retry:
 	attempt++
@@ -528,8 +744,11 @@ CREATE TABLE blob_ (
   hash char(96) NOT NULL,
   is_stored TINYINT(1) NOT NULL DEFAULT 0,
   length bigint(20) unsigned DEFAULT NULL,
+  last_accessed_at TIMESTAMP NULL DEFAULT NULL,
   PRIMARY KEY (id),
-  UNIQUE KEY blob_hash_idx (hash)
+  UNIQUE KEY blob_hash_idx (hash),
+  KEY `blob_last_accessed_idx` (`last_accessed_at`),
+  KEY `is_stored_idx` (`is_stored`)
 );
 
 CREATE TABLE stream (

go.mod

@@ -2,45 +2,50 @@ module github.com/lbryio/reflector.go
 
 replace github.com/btcsuite/btcd => github.com/lbryio/lbrycrd.go v0.0.0-20200203050410-e1076f12bf19
 
-//replace github.com/lbryio/lbry.go/v2 => ../lbry.go
-
 require (
 	github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 // indirect
-	github.com/aws/aws-sdk-go v1.16.11
+	github.com/aws/aws-sdk-go v1.27.0
+	github.com/bluele/gcache v0.0.2
+	github.com/brk0v/directio v0.0.0-20190225130936-69406e757cf7
 	github.com/btcsuite/btcd v0.0.0-20190824003749-130ea5bddde3
 	github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
+	github.com/c2h5oh/datasize v0.0.0-20200825124411-48ed595a09d2
 	github.com/davecgh/go-spew v1.1.1
-	github.com/go-sql-driver/mysql v1.4.1
+	github.com/ekyoung/gin-nice-recovery v0.0.0-20160510022553-1654dca486db
-	github.com/golang/protobuf v1.4.2
+	github.com/gin-gonic/gin v1.7.1
-	github.com/google/btree v1.0.0 // indirect
+	github.com/go-sql-driver/mysql v1.6.0
-	github.com/google/gops v0.3.7
+	github.com/gogo/protobuf v1.2.1
-	github.com/gorilla/mux v1.7.4
+	github.com/golang/protobuf v1.5.2
+	github.com/google/go-cmp v0.5.6 // indirect
+	github.com/google/gops v0.3.18
+	github.com/gorilla/mux v1.8.0
 	github.com/hashicorp/go-msgpack v0.5.5 // indirect
-	github.com/hashicorp/golang-lru v0.5.4
+	github.com/hashicorp/golang-lru v0.5.4 // indirect
-	github.com/hashicorp/memberlist v0.1.4 // indirect
+	github.com/hashicorp/serf v0.9.5
-	github.com/hashicorp/serf v0.8.2
 	github.com/inconshreveable/go-update v0.0.0-20160112193335-8152e7eb6ccf
-	github.com/johntdyer/slackrus v0.0.0-20180518184837-f7aae3243a07
+	github.com/johntdyer/slackrus v0.0.0-20210521205746-42486fb4c48c
 	github.com/karrick/godirwalk v1.16.1
 	github.com/lbryio/chainquery v1.9.0
-	github.com/lbryio/lbry.go v1.1.2 // indirect
+	github.com/lbryio/lbry.go/v2 v2.7.2-0.20210416195322-6516df1418e3
-	github.com/lbryio/lbry.go/v2 v2.7.2-0.20210402181800-ec4d2cb37ce9
 	github.com/lbryio/types v0.0.0-20201019032447-f0b4476ef386
-	github.com/lucas-clemente/quic-go v0.18.1
+	github.com/lucas-clemente/quic-go v0.20.1
 	github.com/phayes/freeport v0.0.0-20171002185219-e27662a4a9d6
-	github.com/prometheus/client_golang v0.9.2
+	github.com/prometheus/client_golang v1.10.0
-	github.com/sirupsen/logrus v1.4.2
+	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/afero v1.4.1 // indirect
 	github.com/spf13/cast v1.3.0
-	github.com/spf13/cobra v0.0.3
+	github.com/spf13/cobra v1.1.3
-	github.com/spf13/pflag v1.0.3 // indirect
+	github.com/spf13/viper v1.7.1 // indirect
 	github.com/stretchr/testify v1.7.0
 	github.com/volatiletech/null v8.0.0+incompatible
-	go.uber.org/atomic v1.5.1
+	go.uber.org/atomic v1.7.0
-	golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f // indirect
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 // indirect
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/tools v0.0.0-20191227053925-7b8e75db28f4 // indirect
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
-	google.golang.org/appengine v1.6.2 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
 )
 
-go 1.15
+go 1.16

go.sum

@@ -2,30 +2,66 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
 dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
 dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
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 github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
-github.com/StackExchange/wmi v0.0.0-20170410192909-ea383cf3ba6e/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
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 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
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 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
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+github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 h1:EFSB7Zo9Eg91v7MJPVsifUysc/wPdN+NOnVe6bWbdBM=
 github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
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+github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
 github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/aws/aws-sdk-go v1.16.11 h1:g/c7gJeVyHoXCxM2fddS85bPGVkBF8s2q8t3fyElegc=
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-github.com/aws/aws-sdk-go v1.16.11/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
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-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
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+github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
+github.com/bluele/gcache v0.0.2 h1:WcbfdXICg7G/DGBh1PFfcirkWOQV+v077yF1pSy3DGw=
+github.com/bluele/gcache v0.0.2/go.mod h1:m15KV+ECjptwSPxKhOhQoAFQVtUFjTVkc3H8o0t/fp0=
 github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=
+github.com/brk0v/directio v0.0.0-20190225130936-69406e757cf7 h1:7gNKWnX6OF+ERiXVw4I9RsHhZ52aumXdFE07nEx5v20=
+github.com/brk0v/directio v0.0.0-20190225130936-69406e757cf7/go.mod h1:M/KA3XJG5PJaApPiv4gWNsgcSJquOQTqumZNLyYE0KM=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f h1:bAs4lUbRJpnnkd9VhRV3jjAVU7DJVjMaK+IsvSeZvFo=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
 github.com/btcsuite/btcutil v0.0.0-20190207003914-4c204d697803/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
@@ -39,77 +75,156 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792 h1:R8vQdOQdZ9Y3
 github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtEyQwv5/p4Mg4C0fgbePVuGr935/5ddU9Z3TmDRY=
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
+github.com/c2h5oh/datasize v0.0.0-20200825124411-48ed595a09d2 h1:t8KYCwSKsOEZBFELI4Pn/phbp38iJ1RRAkDFNin1aak=
+github.com/c2h5oh/datasize v0.0.0-20200825124411-48ed595a09d2/go.mod h1:S/7n9copUssQ56c7aAgHqftWO4LTf4xY6CGWt8Bc+3M=
+github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cheekybits/genny v1.0.0 h1:uGGa4nei+j20rOSeDeP5Of12XVm7TGUd4dJA9RDitfE=
 github.com/cheekybits/genny v1.0.0/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wXkRAgjxjQ=
 github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
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 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-rsc.io/goversion v1.0.0/go.mod h1:Eih9y/uIBS3ulggl7KNJ09xGSLcuNaLgmvvqa07sgfo=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+rsc.io/goversion v1.2.0/go.mod h1:Eih9y/uIBS3ulggl7KNJ09xGSLcuNaLgmvvqa07sgfo=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
 sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
 sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

internal/metrics/metrics.go

@@ -60,6 +60,7 @@ func (s *Server) Shutdown() {
 const (
 	ns             = "reflector"
 	subsystemCache = "cache"
+	subsystemITTT  = "ittt"
 
 	labelDirection = "direction"
 	labelErrorType = "error_type"
@@ -117,6 +118,11 @@ var (
 		Name:      "http3_blob_download_total",
 		Help:      "Total number of blobs downloaded from reflector through QUIC protocol",
 	})
+	HttpDownloadCount = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Name:      "http_blob_download_total",
+		Help:      "Total number of blobs downloaded from reflector through HTTP protocol",
+	})
 
 	CacheHitCount = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: ns,
@@ -124,6 +130,18 @@ var (
 		Name:      "hit_total",
 		Help:      "Total number of blobs retrieved from the cache storage",
 	}, []string{LabelCacheType, LabelComponent})
+	ThisHitCount = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Subsystem: subsystemITTT,
+		Name:      "this_hit_total",
+		Help:      "Total number of blobs retrieved from the this storage",
+	})
+	ThatHitCount = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Subsystem: subsystemITTT,
+		Name:      "that_hit_total",
+		Help:      "Total number of blobs retrieved from the that storage",
+	})
 	CacheMissCount = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: ns,
 		Subsystem: subsystemCache,
@@ -136,7 +154,7 @@ var (
 		Name:      "origin_requests_total",
 		Help:      "How many Get requests are in flight from the cache to the origin",
 	}, []string{LabelCacheType, LabelComponent})
-	// during thundering-herd situations, the metric below should be a lot smaller than the metric above
+	//during thundering-herd situations, the metric below should be a lot smaller than the metric above
 	CacheWaitingRequestsCount = promauto.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: ns,
 		Subsystem: subsystemCache,
@@ -181,11 +199,21 @@ var (
 		Name:      "udp_in_bytes",
 		Help:      "Total number of bytes downloaded through UDP",
 	})
+	MtrInBytesHttp = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Name:      "http_in_bytes",
+		Help:      "Total number of bytes downloaded through HTTP",
+	})
 	MtrOutBytesUdp = promauto.NewCounter(prometheus.CounterOpts{
 		Namespace: ns,
 		Name:      "udp_out_bytes",
 		Help:      "Total number of bytes streamed out through UDP",
 	})
+	MtrOutBytesHttp = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: ns,
+		Name:      "http_out_bytes",
+		Help:      "Total number of bytes streamed out through UDP",
+	})
 	MtrInBytesReflector = promauto.NewCounter(prometheus.CounterOpts{
 		Namespace: ns,
 		Name:      "reflector_in_bytes",
@@ -201,6 +229,21 @@ var (
 		Name:      "s3_in_bytes",
 		Help:      "Total number of incoming bytes (from S3-CF)",
 	})
+	Http3BlobReqQueue = promauto.NewGauge(prometheus.GaugeOpts{
+		Namespace: ns,
+		Name:      "http3_blob_request_queue_size",
+		Help:      "Blob requests of https queue size",
+	})
+	HttpBlobReqQueue = promauto.NewGauge(prometheus.GaugeOpts{
+		Namespace: ns,
+		Name:      "http_blob_request_queue_size",
+		Help:      "Blob requests queue size of the HTTP protocol",
+	})
+	RoutinesQueue = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: ns,
+		Name:      "routines",
+		Help:      "routines running by type",
+	}, []string{"package", "kind"})
 )
 
 func CacheLabels(name, component string) prometheus.Labels {

lite_db/db.go

@@ -0,0 +1,348 @@
+package lite_db
+
+import (
+	"database/sql"
+	"time"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	qt "github.com/lbryio/lbry.go/v2/extras/query"
+
+	"github.com/go-sql-driver/mysql"
+	_ "github.com/go-sql-driver/mysql" // blank import for db driver ensures its imported even if its not used
+	log "github.com/sirupsen/logrus"
+	"github.com/volatiletech/null"
+)
+
+// SdBlob is a special blob that contains information on the rest of the blobs in the stream
+type SdBlob struct {
+	StreamName string `json:"stream_name"`
+	Blobs      []struct {
+		Length   int    `json:"length"`
+		BlobNum  int    `json:"blob_num"`
+		BlobHash string `json:"blob_hash,omitempty"`
+		IV       string `json:"iv"`
+	} `json:"blobs"`
+	StreamType        string `json:"stream_type"`
+	Key               string `json:"key"`
+	SuggestedFileName string `json:"suggested_file_name"`
+	StreamHash        string `json:"stream_hash"`
+}
+
+// SQL implements the DB interface
+type SQL struct {
+	conn *sql.DB
+
+	TrackAccessTime bool
+}
+
+func logQuery(query string, args ...interface{}) {
+	s, err := qt.InterpolateParams(query, args...)
+	if err != nil {
+		log.Errorln(err)
+	} else {
+		log.Debugln(s)
+	}
+}
+
+// Connect will create a connection to the database
+func (s *SQL) Connect(dsn string) error {
+	var err error
+	// interpolateParams is necessary. otherwise uploading a stream with thousands of blobs
+	// will hit MySQL's max_prepared_stmt_count limit because the prepared statements are all
+	// opened inside a transaction. closing them manually doesn't seem to help
+	dsn += "?parseTime=1&collation=utf8mb4_unicode_ci&interpolateParams=1"
+	s.conn, err = sql.Open("mysql", dsn)
+	if err != nil {
+		return errors.Err(err)
+	}
+
+	s.conn.SetMaxIdleConns(12)
+
+	return errors.Err(s.conn.Ping())
+}
+
+// AddBlob adds a blob to the database.
+func (s *SQL) AddBlob(hash string, length int) error {
+	if s.conn == nil {
+		return errors.Err("not connected")
+	}
+
+	_, err := s.insertBlob(hash, length)
+	return err
+}
+
+func (s *SQL) insertBlob(hash string, length int) (int64, error) {
+	if length <= 0 {
+		return 0, errors.Err("length must be positive")
+	}
+	const isStored = true
+	now := time.Now()
+	args := []interface{}{hash, isStored, length, now}
+	blobID, err := s.exec(
+		"INSERT INTO blob_ (hash, is_stored, length, last_accessed_at) VALUES ("+qt.Qs(len(args))+") ON DUPLICATE KEY UPDATE is_stored = (is_stored or VALUES(is_stored)), last_accessed_at=VALUES(last_accessed_at)",
+		args...,
+	)
+	if err != nil {
+		return 0, err
+	}
+
+	if blobID == 0 {
+		err = s.conn.QueryRow("SELECT id FROM blob_ WHERE hash = ?", hash).Scan(&blobID)
+		if err != nil {
+			return 0, errors.Err(err)
+		}
+		if blobID == 0 {
+			return 0, errors.Err("blob ID is 0 even after INSERTing and SELECTing")
+		}
+	}
+
+	return blobID, nil
+}
+
+// HasBlob checks if the database contains the blob information.
+func (s *SQL) HasBlob(hash string) (bool, error) {
+	exists, err := s.HasBlobs([]string{hash})
+	if err != nil {
+		return false, err
+	}
+	return exists[hash], nil
+}
+
+// HasBlobs checks if the database contains the set of blobs and returns a bool map.
+func (s *SQL) HasBlobs(hashes []string) (map[string]bool, error) {
+	exists, streamsNeedingTouch, err := s.hasBlobs(hashes)
+	s.touch(streamsNeedingTouch)
+	return exists, err
+}
+
+func (s *SQL) touch(blobIDs []uint64) error {
+	if len(blobIDs) == 0 {
+		return nil
+	}
+
+	query := "UPDATE blob_ SET last_accessed_at = ? WHERE id IN (" + qt.Qs(len(blobIDs)) + ")"
+	args := make([]interface{}, len(blobIDs)+1)
+	args[0] = time.Now()
+	for i := range blobIDs {
+		args[i+1] = blobIDs[i]
+	}
+
+	startTime := time.Now()
+	_, err := s.exec(query, args...)
+	log.Debugf("blobs access query touched %d blobs and took %s", len(blobIDs), time.Since(startTime))
+	return errors.Err(err)
+}
+
+func (s *SQL) hasBlobs(hashes []string) (map[string]bool, []uint64, error) {
+	if s.conn == nil {
+		return nil, nil, errors.Err("not connected")
+	}
+
+	var (
+		hash           string
+		blobID         uint64
+		lastAccessedAt null.Time
+	)
+
+	var needsTouch []uint64
+	exists := make(map[string]bool)
+
+	touchDeadline := time.Now().AddDate(0, 0, -1) // touch blob if last accessed before this time
+	maxBatchSize := 10000
+	doneIndex := 0
+
+	for len(hashes) > doneIndex {
+		sliceEnd := doneIndex + maxBatchSize
+		if sliceEnd > len(hashes) {
+			sliceEnd = len(hashes)
+		}
+		log.Debugf("getting hashes[%d:%d] of %d", doneIndex, sliceEnd, len(hashes))
+		batch := hashes[doneIndex:sliceEnd]
+
+		// TODO: this query doesn't work for SD blobs, which are not in the stream_blob table
+
+		query := `SELECT hash, id, last_accessed_at
+FROM blob_ 
+WHERE is_stored = ? and hash IN (` + qt.Qs(len(batch)) + `)`
+		args := make([]interface{}, len(batch)+1)
+		args[0] = true
+		for i := range batch {
+			args[i+1] = batch[i]
+		}
+
+		logQuery(query, args...)
+
+		err := func() error {
+			startTime := time.Now()
+			rows, err := s.conn.Query(query, args...)
+			log.Debugf("hashes query took %s", time.Since(startTime))
+			if err != nil {
+				return errors.Err(err)
+			}
+			defer closeRows(rows)
+
+			for rows.Next() {
+				err := rows.Scan(&hash, &blobID, &lastAccessedAt)
+				if err != nil {
+					return errors.Err(err)
+				}
+				exists[hash] = true
+				if s.TrackAccessTime && (!lastAccessedAt.Valid || lastAccessedAt.Time.Before(touchDeadline)) {
+					needsTouch = append(needsTouch, blobID)
+				}
+			}
+
+			err = rows.Err()
+			if err != nil {
+				return errors.Err(err)
+			}
+
+			doneIndex += len(batch)
+			return nil
+		}()
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
+	return exists, needsTouch, nil
+}
+
+// Delete will remove the blob from the db
+func (s *SQL) Delete(hash string) error {
+	_, err := s.exec("UPDATE blob_ set is_stored = ? WHERE hash = ?", 0, hash)
+	return errors.Err(err)
+}
+
+// AddSDBlob insert the SD blob and all the content blobs. The content blobs are marked as "not stored",
+// but they are tracked so reflector knows what it is missing.
+func (s *SQL) AddSDBlob(sdHash string, sdBlobLength int) error {
+	if s.conn == nil {
+		return errors.Err("not connected")
+	}
+
+	_, err := s.insertBlob(sdHash, sdBlobLength)
+	return err
+}
+
+// GetHashRange gets the smallest and biggest hashes in the db
+func (s *SQL) GetLRUBlobs(maxBlobs int) ([]string, error) {
+	if s.conn == nil {
+		return nil, errors.Err("not connected")
+	}
+
+	query := "SELECT hash from blob_ where is_stored = ? order by last_accessed_at limit ?"
+	const isStored = true
+	logQuery(query, isStored, maxBlobs)
+	rows, err := s.conn.Query(query, isStored, maxBlobs)
+	if err != nil {
+		return nil, errors.Err(err)
+	}
+	defer closeRows(rows)
+	blobs := make([]string, 0, maxBlobs)
+	for rows.Next() {
+		var hash string
+		err := rows.Scan(&hash)
+		if err != nil {
+			return nil, errors.Err(err)
+		}
+		blobs = append(blobs, hash)
+	}
+	return blobs, nil
+}
+
+func (s *SQL) AllBlobs() ([]string, error) {
+	if s.conn == nil {
+		return nil, errors.Err("not connected")
+	}
+
+	query := "SELECT hash from blob_ where is_stored = ?" //TODO: maybe sorting them makes more sense?
+	const isStored = true
+	logQuery(query, isStored)
+	rows, err := s.conn.Query(query, isStored)
+	if err != nil {
+		return nil, errors.Err(err)
+	}
+	defer closeRows(rows)
+	totalBlobs, err := s.BlobsCount()
+	if err != nil {
+		return nil, err
+	}
+	blobs := make([]string, 0, totalBlobs)
+	for rows.Next() {
+		var hash string
+		err := rows.Scan(&hash)
+		if err != nil {
+			return nil, errors.Err(err)
+		}
+		blobs = append(blobs, hash)
+	}
+	return blobs, nil
+}
+
+func (s *SQL) BlobsCount() (int, error) {
+	if s.conn == nil {
+		return 0, errors.Err("not connected")
+	}
+
+	query := "SELECT count(id) from blob_ where is_stored = ?" //TODO: maybe sorting them makes more sense?
+	const isStored = true
+	logQuery(query, isStored)
+	var count int
+	err := s.conn.QueryRow(query, isStored).Scan(&count)
+	return count, errors.Err(err)
+}
+
+func closeRows(rows *sql.Rows) {
+	if rows != nil {
+		err := rows.Close()
+		if err != nil {
+			log.Error("error closing rows: ", err)
+		}
+	}
+}
+
+func (s *SQL) exec(query string, args ...interface{}) (int64, error) {
+	logQuery(query, args...)
+	attempt, maxAttempts := 0, 3
+Retry:
+	attempt++
+	result, err := s.conn.Exec(query, args...)
+	if isLockTimeoutError(err) {
+		if attempt <= maxAttempts {
+			//Error 1205: Lock wait timeout exceeded; try restarting transaction
+			goto Retry
+		}
+		err = errors.Prefix("Lock timeout for query "+query, err)
+	}
+
+	if err != nil {
+		return 0, errors.Err(err)
+	}
+
+	lastID, err := result.LastInsertId()
+	return lastID, errors.Err(err)
+}
+
+func isLockTimeoutError(err error) bool {
+	e, ok := err.(*mysql.MySQLError)
+	return ok && e != nil && e.Number == 1205
+}
+
+/*  SQL schema
+
+in prod make sure you use latin1 or utf8 charset, NOT utf8mb4. that's a waste of space.
+
+CREATE TABLE `blob_` (
+  `id` bigint unsigned NOT NULL AUTO_INCREMENT,
+  `hash` char(96) NOT NULL,
+  `is_stored` tinyint(1) NOT NULL DEFAULT '0',
+  `length` bigint unsigned DEFAULT NULL,
+  `last_accessed_at` datetime DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `id` (`id`),
+  UNIQUE KEY `blob_hash_idx` (`hash`),
+  KEY `blob_last_accessed_idx` (`last_accessed_at`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+
+*/

prism/prism.go

@@ -5,14 +5,14 @@ import (
 	"strconv"
 	"sync"
 
-	"github.com/lbryio/lbry.go/v2/dht"
-	"github.com/lbryio/lbry.go/v2/dht/bits"
 	"github.com/lbryio/reflector.go/cluster"
 	"github.com/lbryio/reflector.go/db"
-	"github.com/lbryio/reflector.go/peer"
 	"github.com/lbryio/reflector.go/reflector"
+	"github.com/lbryio/reflector.go/server/peer"
 	"github.com/lbryio/reflector.go/store"
 
+	"github.com/lbryio/lbry.go/v2/dht"
+	"github.com/lbryio/lbry.go/v2/dht/bits"
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/extras/stop"
 
@@ -79,7 +79,7 @@ func New(conf *Config) *Prism {
 		dht:       d,
 		cluster:   c,
 		peer:      peer.NewServer(conf.Blobs),
-		reflector: reflector.NewServer(conf.Blobs),
+		reflector: reflector.NewServer(conf.Blobs, conf.Blobs),
 
 		grp: stop.New(),
 	}

prism/prism_test.go

@@ -4,8 +4,9 @@ import (
 	"math/big"
 	"testing"
 
-	"github.com/davecgh/go-spew/spew"
 	"github.com/lbryio/lbry.go/v2/dht/bits"
+
+	"github.com/davecgh/go-spew/spew"
 )
 
 func TestAnnounceRange(t *testing.T) {

publish/publish.go

@@ -22,24 +22,23 @@ import (
 	"github.com/golang/protobuf/proto"
 )
 
-var TODO = `
+/* TODO:
-	import cert from wallet
+import cert from wallet
-	get all utxos from chainquery
+get all utxos from chainquery
-	create transaction
+create transaction
-	sign it with the channel
+sign it with the channel
-	track state of utxos across publishes from this channel so that we can just do one query to get utxos
+track state of utxos across publishes from this channel so that we can just do one query to get utxos
-	prioritize only confirmed utxos
+prioritize only confirmed utxos
 
-	Handling all the issues we handle currently with lbrynet:
+Handling all the issues we handle currently with lbrynet:
-		"Couldn't find private key for id",
+	"Couldn't find private key for id",
-		"You already have a stream claim published under the name",
+	"You already have a stream claim published under the name",
-		"Cannot publish using channel",
+	"Cannot publish using channel",
-		"txn-mempool-conflict",
+	"txn-mempool-conflict",
-		"too-long-mempool-chain",
+	"too-long-mempool-chain",
-		"Missing inputs",
+	"Missing inputs",
-		"Not enough funds to cover this transaction",
+	"Not enough funds to cover this transaction",
-}
+*/
-`
 
 type Details struct {
 	Title       string

readme.md

@@ -1,19 +1,104 @@
 # Reflector
 
-A reflector cluster to accept LBRY content for hosting en masse, rehost the content, and make money on data fees (TODO). 
+Reflector is a central piece of software that providers LBRY with the following features:
-This code includes Go implementations of the LBRY peer protocol, reflector protocol, and DHT.
+- Blobs reflection: when something is published, we capture the data and store it on our servers for quicker retrieval
+- Blobs distribution: when a piece of content is requested and the LBRY network doesn't have it, reflector will retrieve it from its storage and distribute it
+- Blobs caching: reflectors can be chained together in multiple regions or servers to form a chain of cached content. We call those "blobcaches". They are layered so that content distribution is favorable in all the regions we deploy it to
+
+There are a few other features embedded in reflector.go including publishing streams from Go, downloading or upload blobs, resolving content and more unfinished tools.
+
+This code includes a Go implementations of the LBRY peer protocol, reflector protocol, and DHT.
 
 ## Installation
 
-coming soon
+- Install mysql 8 (5.7 might work too)
+- add a reflector user and database with password `reflector` with localhost access only
+- Create the tables as described [here](https://github.com/lbryio/reflector.go/blob/ittt/db/db.go#L735) (the link might not update as the code does so just look for the schema in that file)
+
+#### We do not support running reflector.go as a blob receiver, however if you want to run it as a private blobcache you may compile it yourself and run it as following:
+```bash
+./prism-bin reflector \
+--conf="none" \
+--disable-uploads=true \
+--use-db=false \
+--upstream-reflector="reflector.lbry.com" \
+--upstream-protocol="http" \
+--request-queue-size=200 \
+--disk-cache="2GB:/path/to/your/storage/:localdb" \
+```
+
+Create a systemd script if you want to run it automatically on startup or as a service.
 
 ## Usage
 
-coming soon
+Usage as reflector/blobcache:
+```bash
+Run reflector server
 
+Usage:
+  prism reflector [flags]
+
+Flags:
+      --disable-blocklist                 Disable blocklist watching/updating
+      --disable-uploads                   Disable uploads to this reflector server
+      --disk-cache string                 Where to cache blobs on the file system. format is 'sizeGB:CACHE_PATH:cachemanager' (cachemanagers: localdb/lfuda/lru) (default "100GB:/tmp/downloaded_blobs:localdb")
+  -h, --help                              help for reflector
+      --http-peer-port int                The port reflector will distribute content from over HTTP protocol (default 5569)
+      --http3-peer-port int               The port reflector will distribute content from over HTTP3 protocol (default 5568)
+      --mem-cache int                     enable in-memory cache with a max size of this many blobs
+      --metrics-port int                  The port reflector will use for prometheus metrics (default 2112)
+      --optional-disk-cache string        Optional secondary file system cache for blobs. format is 'sizeGB:CACHE_PATH:cachemanager' (cachemanagers: localdb/lfuda/lru) (this would get hit before the one specified in disk-cache)
+      --origin-endpoint string            HTTP edge endpoint for standard HTTP retrieval
+      --origin-endpoint-fallback string   HTTP edge endpoint for standard HTTP retrieval if first origin fails
+      --receiver-port int                 The port reflector will receive content from (default 5566)
+      --request-queue-size int            How many concurrent requests from downstream should be handled at once (the rest will wait) (default 200)
+      --tcp-peer-port int                 The port reflector will distribute content from for the TCP (LBRY) protocol (default 5567)
+      --upstream-protocol string          protocol used to fetch blobs from another upstream reflector server (tcp/http3/http) (default "http")
+      --upstream-reflector string         host:port of a reflector server where blobs are fetched from
+      --use-db                            Whether to connect to the reflector db or not (default true)
+
+Global Flags:
+      --conf string       Path to config. Use 'none' to disable (default "config.json")
+  -v, --verbose strings   Verbose logging for specific components
+```
+
+Other uses:
+
+```bash
+Prism is a single entry point application with multiple sub modules which can be leveraged individually or together
+
+Usage:
+  prism [command]
+
+Available Commands:
+  check-integrity check blobs integrity for a given path
+  cluster         Start(join) to or Start a new cluster
+  decode          Decode a claim value
+  dht             Run dht node
+  getstream       Get a stream from a reflector server
+  help            Help about any command
+  peer            Run peer server
+  populate-db     populate local database with blobs from a disk storage
+  publish         Publish a file
+  reflector       Run reflector server
+  resolve         Resolve a URL
+  send            Send a file to a reflector
+  sendblob        Send a random blob to a reflector server
+  start           Runs full prism application with cluster, dht, peer server, and reflector server.
+  test            Test things
+  upload          Upload blobs to S3
+  version         Print the version
+
+Flags:
+      --conf string       Path to config. Use 'none' to disable (default "config.json")
+  -h, --help              help for prism
+  -v, --verbose strings   Verbose logging for specific components
+```
 ## Running from Source
 
-This project requires [Go v1.11](https://golang.org/doc/install) or higher because it uses Go modules.
+This project requires [Go v1.16](https://golang.org/doc/install).
+
+On Ubuntu you can install it with `sudo snap install go --classic`
 
 ```
 git clone git@github.com:lbryio/reflector.go.git
@@ -36,5 +121,4 @@ We take security seriously. Please contact security@lbry.com regarding any secur
 Our PGP key is [here](https://keybase.io/lbry/key.asc) if you need it.
 
 ## Contact
-
+The primary contact for this project is [@Nikooo777](https://github.com/Nikooo777) (niko-at-lbry.com)
-The primary contact for this project is [@lyoshenka](https://github.com/lyoshenka) (grin@lbry.com)

reflector/blocklist.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/store"
 	"github.com/lbryio/reflector.go/wallet"
 
@@ -109,8 +110,9 @@ func sdHashesForOutpoints(walletServers, outpoints []string, stopper stop.Chan)
 	}
 
 	done := make(chan bool)
-
+	metrics.RoutinesQueue.WithLabelValues("reflector", "sdhashesforoutput").Inc()
 	go func() {
+		defer metrics.RoutinesQueue.WithLabelValues("reflector", "sdhashesforoutput").Dec()
 		select {
 		case <-done:
 		case <-stopper:

reflector/server.go

@@ -40,16 +40,18 @@ type Server struct {
 
 	EnableBlocklist bool // if true, blocklist checking and blob deletion will be enabled
 
-	store store.BlobStore
+	underlyingStore store.BlobStore
-	grp   *stop.Group
+	outerStore      store.BlobStore
+	grp             *stop.Group
 }
 
 // NewServer returns an initialized reflector server pointer.
-func NewServer(store store.BlobStore) *Server {
+func NewServer(underlying store.BlobStore, outer store.BlobStore) *Server {
 	return &Server{
-		Timeout: DefaultTimeout,
+		Timeout:         DefaultTimeout,
-		store:   store,
+		underlyingStore: underlying,
-		grp:     stop.New(),
+		outerStore:      outer,
+		grp:             stop.New(),
 	}
 }
 
@@ -67,9 +69,10 @@ func (s *Server) Start(address string) error {
 		return errors.Err(err)
 	}
 	log.Println("reflector listening on " + address)
-
 	s.grp.Add(1)
+	metrics.RoutinesQueue.WithLabelValues("reflector", "listener").Inc()
 	go func() {
+		defer metrics.RoutinesQueue.WithLabelValues("reflector", "listener").Dec()
 		<-s.grp.Ch()
 		err := l.Close()
 		if err != nil {
@@ -79,15 +82,19 @@ func (s *Server) Start(address string) error {
 	}()
 
 	s.grp.Add(1)
+	metrics.RoutinesQueue.WithLabelValues("reflector", "start").Inc()
 	go func() {
+		defer metrics.RoutinesQueue.WithLabelValues("reflector", "start").Dec()
 		s.listenAndServe(l)
 		s.grp.Done()
 	}()
 
 	if s.EnableBlocklist {
-		if b, ok := s.store.(store.Blocklister); ok {
+		if b, ok := s.underlyingStore.(store.Blocklister); ok {
 			s.grp.Add(1)
+			metrics.RoutinesQueue.WithLabelValues("reflector", "enableblocklist").Inc()
 			go func() {
+				defer metrics.RoutinesQueue.WithLabelValues("reflector", "enableblocklist").Dec()
 				s.enableBlocklist(b)
 				s.grp.Done()
 			}()
@@ -110,7 +117,9 @@ func (s *Server) listenAndServe(listener net.Listener) {
 			log.Error(err)
 		} else {
 			s.grp.Add(1)
+			metrics.RoutinesQueue.WithLabelValues("reflector", "server-listenandserve").Inc()
 			go func() {
+				defer metrics.RoutinesQueue.WithLabelValues("reflector", "server-listenandserve").Dec()
 				s.handleConn(conn)
 				s.grp.Done()
 			}()
@@ -125,7 +134,9 @@ func (s *Server) handleConn(conn net.Conn) {
 		close(connNeedsClosing)
 	}()
 	s.grp.Add(1)
+	metrics.RoutinesQueue.WithLabelValues("reflector", "server-handleconn").Inc()
 	go func() {
+		defer metrics.RoutinesQueue.WithLabelValues("reflector", "server-handleconn").Dec()
 		defer s.grp.Done()
 		select {
 		case <-connNeedsClosing:
@@ -190,13 +201,13 @@ func (s *Server) receiveBlob(conn net.Conn) error {
 	}
 
 	var wantsBlob bool
-	if bl, ok := s.store.(store.Blocklister); ok {
+	if bl, ok := s.underlyingStore.(store.Blocklister); ok {
 		wantsBlob, err = bl.Wants(blobHash)
 		if err != nil {
 			return err
 		}
 	} else {
-		blobExists, err := s.store.Has(blobHash)
+		blobExists, err := s.underlyingStore.Has(blobHash)
 		if err != nil {
 			return err
 		}
@@ -206,7 +217,7 @@ func (s *Server) receiveBlob(conn net.Conn) error {
 	var neededBlobs []string
 
 	if isSdBlob && !wantsBlob {
-		if nbc, ok := s.store.(neededBlobChecker); ok {
+		if nbc, ok := s.underlyingStore.(neededBlobChecker); ok {
 			neededBlobs, err = nbc.MissingBlobsForKnownStream(blobHash)
 			if err != nil {
 				return err
@@ -249,9 +260,9 @@ func (s *Server) receiveBlob(conn net.Conn) error {
 	log.Debugln("Got blob " + blobHash[:8])
 
 	if isSdBlob {
-		err = s.store.PutSD(blobHash, blob)
+		err = s.outerStore.PutSD(blobHash, blob)
 	} else {
-		err = s.store.Put(blobHash, blob)
+		err = s.outerStore.Put(blobHash, blob)
 	}
 	if err != nil {
 		return err

reflector/server_test.go

@@ -9,9 +9,10 @@ import (
 	"testing"
 	"time"
 
-	"github.com/lbryio/lbry.go/v2/dht/bits"
 	"github.com/lbryio/reflector.go/store"
 
+	"github.com/lbryio/lbry.go/v2/dht/bits"
+
 	"github.com/davecgh/go-spew/spew"
 	"github.com/phayes/freeport"
 )
@@ -22,7 +23,7 @@ func startServerOnRandomPort(t *testing.T) (*Server, int) {
 		t.Fatal(err)
 	}
 
-	srv := NewServer(store.NewMemStore())
+	srv := NewServer(store.NewMemStore(), store.NewMemStore())
 	err = srv.Start("127.0.0.1:" + strconv.Itoa(port))
 	if err != nil {
 		t.Fatal(err)
@@ -119,7 +120,7 @@ func TestServer_Timeout(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	srv := NewServer(store.NewMemStore())
+	srv := NewServer(store.NewMemStore(), store.NewMemStore())
 	srv.Timeout = testTimeout
 	err = srv.Start("127.0.0.1:" + strconv.Itoa(port))
 	if err != nil {
@@ -190,7 +191,7 @@ func TestServer_PartialUpload(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	srv := NewServer(st)
+	srv := NewServer(st, st)
 	err = srv.Start("127.0.0.1:" + strconv.Itoa(port))
 	if err != nil {
 		t.Fatal(err)

reflector/uploader.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/lbryio/reflector.go/db"
+	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/store"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
@@ -74,7 +75,7 @@ func (u *Uploader) Upload(dirOrFilePath string) error {
 
 	var exists map[string]bool
 	if !u.skipExistsCheck {
-		exists, err = u.db.HasBlobs(hashes)
+		exists, err = u.db.HasBlobs(hashes, false)
 		if err != nil {
 			return err
 		}
@@ -88,7 +89,9 @@ func (u *Uploader) Upload(dirOrFilePath string) error {
 
 	for i := 0; i < u.workers; i++ {
 		workerWG.Add(1)
+		metrics.RoutinesQueue.WithLabelValues("reflector", "upload").Inc()
 		go func(i int) {
+			defer metrics.RoutinesQueue.WithLabelValues("reflector", "upload").Dec()
 			defer workerWG.Done()
 			defer func(i int) { log.Debugf("worker %d quitting", i) }(i)
 			u.worker(pathChan)
@@ -97,7 +100,9 @@ func (u *Uploader) Upload(dirOrFilePath string) error {
 
 	countWG := sync.WaitGroup{}
 	countWG.Add(1)
+	metrics.RoutinesQueue.WithLabelValues("reflector", "uploader").Inc()
 	go func() {
+		defer metrics.RoutinesQueue.WithLabelValues("reflector", "uploader").Dec()
 		defer countWG.Done()
 		u.counter()
 	}()

server/http/routes.go

@@ -0,0 +1,92 @@
+package http
+
+import (
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
+	"github.com/lbryio/reflector.go/store"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (s *Server) getBlob(c *gin.Context) {
+	waiter := &sync.WaitGroup{}
+	waiter.Add(1)
+	enqueue(&blobRequest{c: c, finished: waiter})
+	waiter.Wait()
+}
+
+func (s *Server) HandleGetBlob(c *gin.Context) {
+	start := time.Now()
+	hash := c.Query("hash")
+
+	if s.missesCache.Has(hash) {
+		serialized, err := shared.NewBlobTrace(time.Since(start), "http").Serialize()
+		c.Header("Via", serialized)
+		if err != nil {
+			_ = c.Error(errors.Err(err))
+			c.String(http.StatusInternalServerError, err.Error())
+			return
+		}
+		c.AbortWithStatus(http.StatusNotFound)
+		return
+	}
+	blob, trace, err := s.store.Get(hash)
+	if err != nil {
+		serialized, serializeErr := trace.Serialize()
+		if serializeErr != nil {
+			_ = c.Error(errors.Prefix(serializeErr.Error(), err))
+			c.String(http.StatusInternalServerError, errors.Prefix(serializeErr.Error(), err).Error())
+			return
+		}
+		c.Header("Via", serialized)
+
+		if errors.Is(err, store.ErrBlobNotFound) {
+			_ = s.missesCache.Set(hash, true)
+			c.AbortWithStatus(http.StatusNotFound)
+			return
+		}
+		_ = c.Error(err)
+		c.String(http.StatusInternalServerError, err.Error())
+		return
+	}
+	serialized, err := trace.Serialize()
+	if err != nil {
+		_ = c.Error(err)
+		c.String(http.StatusInternalServerError, err.Error())
+		return
+	}
+	metrics.MtrOutBytesHttp.Add(float64(len(blob)))
+	metrics.BlobDownloadCount.Inc()
+	metrics.HttpDownloadCount.Inc()
+	c.Header("Via", serialized)
+	c.Header("Content-Disposition", "filename="+hash)
+	c.Data(http.StatusOK, "application/octet-stream", blob)
+}
+
+func (s *Server) hasBlob(c *gin.Context) {
+	hash := c.Query("hash")
+	has, err := s.store.Has(hash)
+	if err != nil {
+		_ = c.Error(err)
+		c.String(http.StatusInternalServerError, err.Error())
+		return
+	}
+	if has {
+		c.Status(http.StatusNoContent)
+		return
+	}
+	c.Status(http.StatusNotFound)
+}
+
+func (s *Server) recoveryHandler(c *gin.Context, err interface{}) {
+	c.JSON(500, gin.H{
+		"title": "Error",
+		"err":   err,
+	})
+}

server/http/server.go

@@ -0,0 +1,79 @@
+package http
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/lbryio/reflector.go/store"
+
+	"github.com/lbryio/lbry.go/v2/extras/stop"
+
+	"github.com/bluele/gcache"
+	nice "github.com/ekyoung/gin-nice-recovery"
+	"github.com/gin-gonic/gin"
+	log "github.com/sirupsen/logrus"
+)
+
+// Server is an instance of a peer server that houses the listener and store.
+type Server struct {
+	store              store.BlobStore
+	grp                *stop.Group
+	concurrentRequests int
+	missesCache        gcache.Cache
+}
+
+// NewServer returns an initialized Server pointer.
+func NewServer(store store.BlobStore, requestQueueSize int) *Server {
+	return &Server{
+		store:              store,
+		grp:                stop.New(),
+		concurrentRequests: requestQueueSize,
+		missesCache:        gcache.New(2000).Expiration(5 * time.Minute).ARC().Build(),
+	}
+}
+
+// Shutdown gracefully shuts down the peer server.
+func (s *Server) Shutdown() {
+	log.Debug("shutting down HTTP server")
+	s.grp.StopAndWait()
+	log.Debug("HTTP server stopped")
+}
+
+// Start starts the server listener to handle connections.
+func (s *Server) Start(address string) error {
+	gin.SetMode(gin.ReleaseMode)
+	router := gin.Default()
+	router.GET("/blob", s.getBlob)
+	router.HEAD("/blob", s.hasBlob)
+	// Install nice.Recovery, passing the handler to call after recovery
+	router.Use(nice.Recovery(s.recoveryHandler))
+	srv := &http.Server{
+		Addr:    address,
+		Handler: router,
+	}
+	go s.listenForShutdown(srv)
+	go InitWorkers(s, s.concurrentRequests)
+	// Initializing the server in a goroutine so that
+	// it won't block the graceful shutdown handling below
+	s.grp.Add(1)
+	go func() {
+		defer s.grp.Done()
+		log.Println("HTTP server listening on " + address)
+		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			log.Fatalf("listen: %s\n", err)
+		}
+	}()
+	return nil
+}
+
+func (s *Server) listenForShutdown(listener *http.Server) {
+	<-s.grp.Ch()
+	// The context is used to inform the server it has 5 seconds to finish
+	// the request it is currently handling
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	if err := listener.Shutdown(ctx); err != nil {
+		log.Fatal("Server forced to shutdown:", err)
+	}
+}

server/http/worker.go

@@ -0,0 +1,46 @@
+package http
+
+import (
+	"sync"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
+
+	"github.com/lbryio/lbry.go/v2/extras/stop"
+
+	"github.com/gin-gonic/gin"
+)
+
+type blobRequest struct {
+	c        *gin.Context
+	finished *sync.WaitGroup
+}
+
+var getReqCh = make(chan *blobRequest, 20000)
+
+func InitWorkers(server *Server, workers int) {
+	stopper := stop.New(server.grp)
+	for i := 0; i < workers; i++ {
+		metrics.RoutinesQueue.WithLabelValues("http", "worker").Inc()
+		go func(worker int) {
+			defer metrics.RoutinesQueue.WithLabelValues("http", "worker").Dec()
+			for {
+				select {
+				case <-stopper.Ch():
+				case r := <-getReqCh:
+					process(server, r)
+					metrics.HttpBlobReqQueue.Dec()
+				}
+			}
+		}(i)
+	}
+}
+
+func enqueue(b *blobRequest) {
+	metrics.HttpBlobReqQueue.Inc()
+	getReqCh <- b
+}
+
+func process(server *Server, r *blobRequest) {
+	server.HandleGetBlob(r.c)
+	r.finished.Done()
+}

server/http3/client.go

@@ -9,12 +9,15 @@ import (
 	"sync"
 	"time"
 
-	"github.com/lbryio/lbry.go/v2/extras/errors"
-	"github.com/lbryio/lbry.go/v2/stream"
 	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
 	"github.com/lbryio/reflector.go/store"
 
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	"github.com/lbryio/lbry.go/v2/stream"
+
 	"github.com/lucas-clemente/quic-go/http3"
+	log "github.com/sirupsen/logrus"
 )
 
 // Client is an instance of a client connected to a server.
@@ -35,7 +38,7 @@ func (c *Client) Close() error {
 func (c *Client) GetStream(sdHash string, blobCache store.BlobStore) (stream.Stream, error) {
 	var sd stream.SDBlob
 
-	b, err := c.GetBlob(sdHash)
+	b, _, err := c.GetBlob(sdHash)
 	if err != nil {
 		return nil, err
 	}
@@ -49,10 +52,12 @@ func (c *Client) GetStream(sdHash string, blobCache store.BlobStore) (stream.Str
 	s[0] = b
 
 	for i := 0; i < len(sd.BlobInfos)-1; i++ {
-		s[i+1], err = c.GetBlob(hex.EncodeToString(sd.BlobInfos[i].BlobHash))
+		var trace shared.BlobTrace
+		s[i+1], trace, err = c.GetBlob(hex.EncodeToString(sd.BlobInfos[i].BlobHash))
 		if err != nil {
 			return nil, err
 		}
+		log.Debug(trace.String())
 	}
 
 	return s, nil
@@ -75,26 +80,35 @@ func (c *Client) HasBlob(hash string) (bool, error) {
 }
 
 // GetBlob gets a blob
-func (c *Client) GetBlob(hash string) (stream.Blob, error) {
+func (c *Client) GetBlob(hash string) (stream.Blob, shared.BlobTrace, error) {
-	resp, err := c.conn.Get(fmt.Sprintf("https://%s/get/%s", c.ServerAddr, hash))
+	start := time.Now()
+	resp, err := c.conn.Get(fmt.Sprintf("https://%s/get/%s?trace=true", c.ServerAddr, hash))
 	if err != nil {
-		return nil, errors.Err(err)
+		return nil, shared.NewBlobTrace(time.Since(start), "http3"), errors.Err(err)
 	}
 	defer resp.Body.Close()
 
 	if resp.StatusCode == http.StatusNotFound {
 		fmt.Printf("%s blob not found %d\n", hash, resp.StatusCode)
-		return nil, errors.Err(store.ErrBlobNotFound)
+		return nil, shared.NewBlobTrace(time.Since(start), "http3"), errors.Err(store.ErrBlobNotFound)
 	} else if resp.StatusCode != http.StatusOK {
-		return nil, errors.Err("non 200 status code returned: %d", resp.StatusCode)
+		return nil, shared.NewBlobTrace(time.Since(start), "http3"), errors.Err("non 200 status code returned: %d", resp.StatusCode)
 	}
 
 	tmp := getBuffer()
 	defer putBuffer(tmp)
-
+	serialized := resp.Header.Get("Via")
+	trace := shared.NewBlobTrace(time.Since(start), "http3")
+	if serialized != "" {
+		parsedTrace, err := shared.Deserialize(serialized)
+		if err != nil {
+			return nil, shared.NewBlobTrace(time.Since(start), "http3"), err
+		}
+		trace = *parsedTrace
+	}
 	written, err := io.Copy(tmp, resp.Body)
 	if err != nil {
-		return nil, errors.Err(err)
+		return nil, trace.Stack(time.Since(start), "http3"), errors.Err(err)
 	}
 
 	blob := make([]byte, written)
@@ -102,7 +116,7 @@ func (c *Client) GetBlob(hash string) (stream.Blob, error) {
 
 	metrics.MtrInBytesUdp.Add(float64(len(blob)))
 
-	return blob, nil
+	return blob, trace.Stack(time.Since(start), "http3"), nil
 }
 
 // buffer pool to reduce GC

server/http3/server.go

@@ -10,6 +10,8 @@ import (
 	"fmt"
 	"math/big"
 	"net/http"
+	"strconv"
+	"sync"
 	"time"
 
 	"github.com/lbryio/reflector.go/internal/metrics"
@@ -26,15 +28,17 @@ import (
 
 // Server is an instance of a peer server that houses the listener and store.
 type Server struct {
-	store store.BlobStore
+	store              store.BlobStore
-	grp   *stop.Group
+	grp                *stop.Group
+	concurrentRequests int
 }
 
 // NewServer returns an initialized Server pointer.
-func NewServer(store store.BlobStore) *Server {
+func NewServer(store store.BlobStore, requestQueueSize int) *Server {
 	return &Server{
-		store: store,
+		store:              store,
-		grp:   stop.New(),
+		grp:                stop.New(),
+		concurrentRequests: requestQueueSize,
 	}
 }
 
@@ -63,33 +67,21 @@ type availabilityResponse struct {
 // Start starts the server listener to handle connections.
 func (s *Server) Start(address string) error {
 	log.Println("HTTP3 peer listening on " + address)
+	window500M := 500 * 1 << 20
+
 	quicConf := &quic.Config{
-		HandshakeTimeout: 4 * time.Second,
+		MaxStreamReceiveWindow:     uint64(window500M),
-		MaxIdleTimeout:   10 * time.Second,
+		MaxConnectionReceiveWindow: uint64(window500M),
+		EnableDatagrams:            true,
+		HandshakeIdleTimeout:       4 * time.Second,
+		MaxIdleTimeout:             20 * time.Second,
 	}
 	r := mux.NewRouter()
 	r.HandleFunc("/get/{hash}", func(w http.ResponseWriter, r *http.Request) {
-		vars := mux.Vars(r)
+		waiter := &sync.WaitGroup{}
-		requestedBlob := vars["hash"]
+		waiter.Add(1)
-		blob, err := s.store.Get(requestedBlob)
+		enqueue(&blobRequest{request: r, reply: w, finished: waiter})
-		if err != nil {
+		waiter.Wait()
-			if errors.Is(err, store.ErrBlobNotFound) {
-				http.Error(w, err.Error(), http.StatusNotFound)
-				return
-			}
-			fmt.Printf("%s: %s", requestedBlob, errors.FullTrace(err))
-			s.logError(err)
-			http.Error(w, err.Error(), http.StatusBadRequest)
-			return
-		}
-
-		_, err = w.Write(blob)
-		if err != nil {
-			s.logError(err)
-		}
-		metrics.MtrOutBytesUdp.Add(float64(len(blob)))
-		metrics.BlobDownloadCount.Inc()
-		metrics.Http3DownloadCount.Inc()
 	})
 	r.HandleFunc("/has/{hash}", func(w http.ResponseWriter, r *http.Request) {
 		vars := mux.Vars(r)
@@ -127,7 +119,7 @@ func (s *Server) Start(address string) error {
 		},
 		QuicConfig: quicConf,
 	}
-
+	go InitWorkers(s, s.concurrentRequests)
 	go s.listenForShutdown(&server)
 	s.grp.Add(1)
 	go func() {
@@ -176,3 +168,47 @@ func (s *Server) listenForShutdown(listener *http3.Server) {
 		log.Error("error closing listener for peer server - ", err)
 	}
 }
+
+func (s *Server) HandleGetBlob(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	requestedBlob := vars["hash"]
+	traceParam := r.URL.Query().Get("trace")
+	var err error
+	wantsTrace := false
+	if traceParam != "" {
+		wantsTrace, err = strconv.ParseBool(traceParam)
+		if err != nil {
+			wantsTrace = false
+		}
+	}
+
+	blob, trace, err := s.store.Get(requestedBlob)
+
+	if wantsTrace {
+		serialized, err := trace.Serialize()
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusNotFound)
+			return
+		}
+		w.Header().Add("Via", serialized)
+		log.Debug(trace.String())
+	}
+	if err != nil {
+		if errors.Is(err, store.ErrBlobNotFound) {
+			http.Error(w, err.Error(), http.StatusNotFound)
+			return
+		}
+		fmt.Printf("%s: %s", requestedBlob, errors.FullTrace(err))
+		s.logError(err)
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	_, err = w.Write(blob)
+	if err != nil {
+		s.logError(err)
+	}
+	metrics.MtrOutBytesUdp.Add(float64(len(blob)))
+	metrics.BlobDownloadCount.Inc()
+	metrics.Http3DownloadCount.Inc()
+}

server/http3/store.go

@@ -4,10 +4,16 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"net/http"
+	"strings"
+	"sync"
 	"time"
 
+	"github.com/lbryio/reflector.go/shared"
+	"github.com/lbryio/reflector.go/store"
+
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
+
 	"github.com/lucas-clemente/quic-go"
 	"github.com/lucas-clemente/quic-go/http3"
 )
@@ -15,7 +21,8 @@ import (
 // Store is a blob store that gets blobs from a peer.
 // It satisfies the store.BlobStore interface but cannot put or delete blobs.
 type Store struct {
-	opts StoreOpts
+	opts          StoreOpts
+	NotFoundCache *sync.Map
 }
 
 // StoreOpts allows to set options for a new Store.
@@ -26,13 +33,17 @@ type StoreOpts struct {
 
 // NewStore makes a new peer store.
 func NewStore(opts StoreOpts) *Store {
-	return &Store{opts: opts}
+	return &Store{opts: opts, NotFoundCache: &sync.Map{}}
 }
 
 func (p *Store) getClient() (*Client, error) {
 	var qconf quic.Config
-	qconf.HandshakeTimeout = 4 * time.Second
+	window500M := 500 * 1 << 20
-	qconf.MaxIdleTimeout = 10 * time.Second
+	qconf.MaxStreamReceiveWindow = uint64(window500M)
+	qconf.MaxConnectionReceiveWindow = uint64(window500M)
+	qconf.EnableDatagrams = true
+	qconf.HandshakeIdleTimeout = 4 * time.Second
+	qconf.MaxIdleTimeout = 20 * time.Second
 	pool, err := x509.SystemCertPool()
 	if err != nil {
 		return nil, err
@@ -68,10 +79,19 @@ func (p *Store) Has(hash string) (bool, error) {
 }
 
 // Get downloads the blob from the peer
-func (p *Store) Get(hash string) (stream.Blob, error) {
+func (p *Store) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
+	if lastChecked, ok := p.NotFoundCache.Load(hash); ok {
+		if lastChecked.(time.Time).After(time.Now().Add(-5 * time.Minute)) {
+			return nil, shared.NewBlobTrace(time.Since(start), p.Name()+"-notfoundcache"), store.ErrBlobNotFound
+		}
+	}
 	c, err := p.getClient()
+	if err != nil && strings.Contains(err.Error(), "blob not found") {
+		p.NotFoundCache.Store(hash, time.Now())
+	}
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), p.Name()), err
 	}
 	defer c.Close()
 	return c.GetBlob(hash)
@@ -79,15 +99,19 @@ func (p *Store) Get(hash string) (stream.Blob, error) {
 
 // Put is not supported
 func (p *Store) Put(hash string, blob stream.Blob) error {
-	panic("http3Store cannot put or delete blobs")
+	return errors.Err(shared.ErrNotImplemented)
 }
 
 // PutSD is not supported
 func (p *Store) PutSD(hash string, blob stream.Blob) error {
-	panic("http3Store cannot put or delete blobs")
+	return errors.Err(shared.ErrNotImplemented)
 }
 
 // Delete is not supported
 func (p *Store) Delete(hash string) error {
-	panic("http3Store cannot put or delete blobs")
+	return errors.Err(shared.ErrNotImplemented)
+}
+
+// Shutdown is not supported
+func (p *Store) Shutdown() {
 }

server/http3/worker.go

@@ -0,0 +1,46 @@
+package http3
+
+import (
+	"net/http"
+	"sync"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
+
+	"github.com/lbryio/lbry.go/v2/extras/stop"
+)
+
+type blobRequest struct {
+	request  *http.Request
+	reply    http.ResponseWriter
+	finished *sync.WaitGroup
+}
+
+var getReqCh = make(chan *blobRequest, 20000)
+
+func InitWorkers(server *Server, workers int) {
+	stopper := stop.New(server.grp)
+	for i := 0; i < workers; i++ {
+		metrics.RoutinesQueue.WithLabelValues("http3", "worker").Inc()
+		go func(worker int) {
+			defer metrics.RoutinesQueue.WithLabelValues("http3", "worker").Dec()
+			for {
+				select {
+				case <-stopper.Ch():
+				case r := <-getReqCh:
+					metrics.Http3BlobReqQueue.Dec()
+					process(server, r)
+				}
+			}
+		}(i)
+	}
+}
+
+func enqueue(b *blobRequest) {
+	metrics.Http3BlobReqQueue.Inc()
+	getReqCh <- b
+}
+
+func process(server *Server, r *blobRequest) {
+	server.HandleGetBlob(r.reply, r.request)
+	r.finished.Done()
+}

server/peer/client.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
 	"github.com/lbryio/reflector.go/store"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
@@ -17,9 +18,6 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-// ErrBlobExists is a default error for when a blob already exists on the reflector server.
-var ErrBlobExists = errors.Base("blob exists on server")
-
 // Client is an instance of a client connected to a server.
 type Client struct {
 	Timeout   time.Duration
@@ -57,10 +55,11 @@ func (c *Client) GetStream(sdHash string, blobCache store.BlobStore) (stream.Str
 
 	var sd stream.SDBlob
 
-	b, err := c.GetBlob(sdHash)
+	b, trace, err := c.GetBlob(sdHash)
 	if err != nil {
 		return nil, err
 	}
+	log.Debug(trace.String())
 
 	err = sd.FromBlob(b)
 	if err != nil {
@@ -71,10 +70,11 @@ func (c *Client) GetStream(sdHash string, blobCache store.BlobStore) (stream.Str
 	s[0] = b
 
 	for i := 0; i < len(sd.BlobInfos)-1; i++ {
-		s[i+1], err = c.GetBlob(hex.EncodeToString(sd.BlobInfos[i].BlobHash))
+		s[i+1], trace, err = c.GetBlob(hex.EncodeToString(sd.BlobInfos[i].BlobHash))
 		if err != nil {
 			return nil, err
 		}
+		log.Debug(trace.String())
 	}
 
 	return s, nil
@@ -114,47 +114,52 @@ func (c *Client) HasBlob(hash string) (bool, error) {
 }
 
 // GetBlob gets a blob
-func (c *Client) GetBlob(hash string) (stream.Blob, error) {
+func (c *Client) GetBlob(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
 	if !c.connected {
-		return nil, errors.Err("not connected")
+		return nil, shared.NewBlobTrace(time.Since(start), "tcp"), errors.Err("not connected")
 	}
 
 	sendRequest, err := json.Marshal(blobRequest{
 		RequestedBlob: hash,
 	})
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), "tcp"), err
 	}
 
 	err = c.write(sendRequest)
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), "tcp"), err
 	}
 
 	var resp blobResponse
 	err = c.read(&resp)
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), "tcp"), err
 	}
 
+	trace := shared.NewBlobTrace(time.Since(start), "tcp")
+	if resp.RequestTrace != nil {
+		trace = *resp.RequestTrace
+	}
 	if resp.IncomingBlob.Error != "" {
-		return nil, errors.Prefix(hash[:8], resp.IncomingBlob.Error)
+		return nil, trace, errors.Prefix(hash[:8], resp.IncomingBlob.Error)
 	}
 	if resp.IncomingBlob.BlobHash != hash {
-		return nil, errors.Prefix(hash[:8], "blob hash in response does not match requested hash")
+		return nil, trace.Stack(time.Since(start), "tcp"), errors.Prefix(hash[:8], "blob hash in response does not match requested hash")
 	}
 	if resp.IncomingBlob.Length <= 0 {
-		return nil, errors.Prefix(hash[:8], "length reported as <= 0")
+		return nil, trace, errors.Prefix(hash[:8], "length reported as <= 0")
 	}
 
 	log.Debugf("receiving blob %s from %s", hash[:8], c.conn.RemoteAddr())
 
 	blob, err := c.readRawBlob(resp.IncomingBlob.Length)
 	if err != nil {
-		return nil, err
+		return nil, (*resp.RequestTrace).Stack(time.Since(start), "tcp"), err
 	}
 	metrics.MtrInBytesTcp.Add(float64(len(blob)))
-	return blob, nil
+	return blob, trace.Stack(time.Since(start), "tcp"), nil
 }
 
 func (c *Client) read(v interface{}) error {

server/peer/server.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/reflector"
+	"github.com/lbryio/reflector.go/shared"
 	"github.com/lbryio/reflector.go/store"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
@@ -88,7 +89,9 @@ func (s *Server) listenAndServe(listener net.Listener) {
 			log.Error(errors.Prefix("accepting conn", err))
 		} else {
 			s.grp.Add(1)
+			metrics.RoutinesQueue.WithLabelValues("peer", "server-handleconn").Inc()
 			go func() {
+				defer metrics.RoutinesQueue.WithLabelValues("peer", "server-handleconn").Dec()
 				s.handleConnection(conn)
 				s.grp.Done()
 			}()
@@ -253,6 +256,7 @@ func (s *Server) handleCompositeRequest(data []byte) ([]byte, error) {
 	}
 
 	var blob []byte
+	var trace shared.BlobTrace
 	if request.RequestedBlob != "" {
 		if len(request.RequestedBlob) != stream.BlobHashHexLength {
 			return nil, errors.Err("Invalid blob hash length")
@@ -260,7 +264,8 @@ func (s *Server) handleCompositeRequest(data []byte) ([]byte, error) {
 
 		log.Debugln("Sending blob " + request.RequestedBlob[:8])
 
-		blob, err = s.store.Get(request.RequestedBlob)
+		blob, trace, err = s.store.Get(request.RequestedBlob)
+		log.Debug(trace.String())
 		if errors.Is(err, store.ErrBlobNotFound) {
 			response.IncomingBlob = incomingBlob{
 				Error: err.Error(),
@@ -382,6 +387,7 @@ type incomingBlob struct {
 }
 type blobResponse struct {
 	IncomingBlob incomingBlob `json:"incoming_blob"`
+	RequestTrace *shared.BlobTrace
 }
 
 type compositeRequest struct {

server/peer/store.go

@@ -1,8 +1,12 @@
 package peer
 
 import (
+	"strings"
 	"time"
 
+	"github.com/lbryio/reflector.go/shared"
+	"github.com/lbryio/reflector.go/store"
+
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
 )
@@ -43,26 +47,36 @@ func (p *Store) Has(hash string) (bool, error) {
 }
 
 // Get downloads the blob from the peer
-func (p *Store) Get(hash string) (stream.Blob, error) {
+func (p *Store) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
 	c, err := p.getClient()
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), p.Name()), err
 	}
 	defer c.Close()
-	return c.GetBlob(hash)
+	blob, trace, err := c.GetBlob(hash)
+	if err != nil && strings.Contains(err.Error(), "blob not found") {
+		return nil, trace, store.ErrBlobNotFound
+	}
+
+	return blob, trace, err
 }
 
 // Put is not supported
 func (p *Store) Put(hash string, blob stream.Blob) error {
-	panic("PeerStore cannot put or delete blobs")
+	return errors.Err(shared.ErrNotImplemented)
 }
 
 // PutSD is not supported
 func (p *Store) PutSD(hash string, blob stream.Blob) error {
-	panic("PeerStore cannot put or delete blobs")
+	return errors.Err(shared.ErrNotImplemented)
 }
 
 // Delete is not supported
 func (p *Store) Delete(hash string) error {
-	panic("PeerStore cannot put or delete blobs")
+	return errors.Err(shared.ErrNotImplemented)
+}
+
+// Shutdown is not supported
+func (p *Store) Shutdown() {
 }

shared/errors.go

@@ -0,0 +1,6 @@
+package shared
+
+import "github.com/lbryio/lbry.go/v2/extras/errors"
+
+//ErrNotImplemented is a standard error when a store that implements the store interface does not implement a method
+var ErrNotImplemented = errors.Base("this store does not implement this method")

shared/shared.go

@@ -0,0 +1,82 @@
+package shared
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+)
+
+type BlobStack struct {
+	Timing     time.Duration `json:"timing"`
+	OriginName string        `json:"origin_name"`
+	HostName   string        `json:"host_name"`
+}
+type BlobTrace struct {
+	Stacks []BlobStack `json:"stacks"`
+}
+
+var hostName *string
+
+func getHostName() string {
+	if hostName == nil {
+		hn, err := os.Hostname()
+		if err != nil {
+			hn = "unknown"
+		}
+		hostName = &hn
+	}
+	return *hostName
+}
+func (b *BlobTrace) Stack(timing time.Duration, originName string) BlobTrace {
+	b.Stacks = append(b.Stacks, BlobStack{
+		Timing:     timing,
+		OriginName: originName,
+		HostName:   getHostName(),
+	})
+	return *b
+}
+func (b *BlobTrace) Merge(otherTrance BlobTrace) BlobTrace {
+	b.Stacks = append(b.Stacks, otherTrance.Stacks...)
+	return *b
+}
+func NewBlobTrace(timing time.Duration, originName string) BlobTrace {
+	b := BlobTrace{}
+	b.Stacks = append(b.Stacks, BlobStack{
+		Timing:     timing,
+		OriginName: originName,
+		HostName:   getHostName(),
+	})
+	return b
+}
+
+func (b BlobTrace) String() string {
+	var fullTrace string
+	for i, stack := range b.Stacks {
+		delta := time.Duration(0)
+		if i > 0 {
+			delta = stack.Timing - b.Stacks[i-1].Timing
+		}
+		fullTrace += fmt.Sprintf("[%d](%s) origin: %s - timing: %s - delta: %s\n", i, stack.HostName, stack.OriginName, stack.Timing.String(), delta.String())
+	}
+	return fullTrace
+}
+
+func (b BlobTrace) Serialize() (string, error) {
+	t, err := json.Marshal(b)
+	if err != nil {
+		return "", errors.Err(err)
+	}
+	return string(t), nil
+}
+
+func Deserialize(serializedData string) (*BlobTrace, error) {
+	var trace BlobTrace
+	err := json.Unmarshal([]byte(serializedData), &trace)
+	if err != nil {
+		return nil, errors.Err(err)
+	}
+	return &trace, nil
+}

shared/shared_test.go

@@ -0,0 +1,36 @@
+package shared
+
+import (
+	"testing"
+	"time"
+
+	"github.com/lbryio/lbry.go/v2/extras/util"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBlobTrace_Serialize(t *testing.T) {
+	hostName = util.PtrToString("test_machine")
+	stack := NewBlobTrace(10*time.Second, "test")
+	stack.Stack(20*time.Second, "test2")
+	stack.Stack(30*time.Second, "test3")
+	serialized, err := stack.Serialize()
+	assert.NoError(t, err)
+	t.Log(serialized)
+	expected := "{\"stacks\":[{\"timing\":10000000000,\"origin_name\":\"test\",\"host_name\":\"test_machine\"},{\"timing\":20000000000,\"origin_name\":\"test2\",\"host_name\":\"test_machine\"},{\"timing\":30000000000,\"origin_name\":\"test3\",\"host_name\":\"test_machine\"}]}"
+	assert.Equal(t, expected, serialized)
+}
+
+func TestBlobTrace_Deserialize(t *testing.T) {
+	hostName = util.PtrToString("test_machine")
+	serialized := "{\"stacks\":[{\"timing\":10000000000,\"origin_name\":\"test\"},{\"timing\":20000000000,\"origin_name\":\"test2\"},{\"timing\":30000000000,\"origin_name\":\"test3\"}]}"
+	stack, err := Deserialize(serialized)
+	assert.NoError(t, err)
+	assert.Len(t, stack.Stacks, 3)
+	assert.Equal(t, stack.Stacks[0].Timing, 10*time.Second)
+	assert.Equal(t, stack.Stacks[1].Timing, 20*time.Second)
+	assert.Equal(t, stack.Stacks[2].Timing, 30*time.Second)
+	assert.Equal(t, stack.Stacks[0].OriginName, "test")
+	assert.Equal(t, stack.Stacks[1].OriginName, "test2")
+	assert.Equal(t, stack.Stacks[2].OriginName, "test3")
+}

store/caching.go

@@ -3,10 +3,13 @@ package store
 import (
 	"time"
 
+	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
+
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
 
-	"github.com/lbryio/reflector.go/internal/metrics"
+	log "github.com/sirupsen/logrus"
 )
 
 // CachingStore combines two stores, typically a local and a remote store, to improve performance.
@@ -22,7 +25,7 @@ func NewCachingStore(component string, origin, cache BlobStore) *CachingStore {
 	return &CachingStore{
 		component: component,
 		origin:    WithSingleFlight(component, origin),
-		cache:     cache,
+		cache:     WithSingleFlight(component, cache),
 	}
 }
 
@@ -42,9 +45,9 @@ func (c *CachingStore) Has(hash string) (bool, error) {
 
 // Get tries to get the blob from the cache first, falling back to the origin. If the blob comes
 // from the origin, it is also stored in the cache.
-func (c *CachingStore) Get(hash string) (stream.Blob, error) {
+func (c *CachingStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
 	start := time.Now()
-	blob, err := c.cache.Get(hash)
+	blob, trace, err := c.cache.Get(hash)
 	if err == nil || !errors.Is(err, ErrBlobNotFound) {
 		metrics.CacheHitCount.With(metrics.CacheLabels(c.cache.Name(), c.component)).Inc()
 		rate := float64(len(blob)) / 1024 / 1024 / time.Since(start).Seconds()
@@ -53,18 +56,21 @@ func (c *CachingStore) Get(hash string) (stream.Blob, error) {
 			metrics.LabelComponent: c.component,
 			metrics.LabelSource:    "cache",
 		}).Set(rate)
-		return blob, err
+		return blob, trace.Stack(time.Since(start), c.Name()), err
 	}
 
 	metrics.CacheMissCount.With(metrics.CacheLabels(c.cache.Name(), c.component)).Inc()
 
-	blob, err = c.origin.Get(hash)
+	blob, trace, err = c.origin.Get(hash)
 	if err != nil {
-		return nil, err
+		return nil, trace.Stack(time.Since(start), c.Name()), err
 	}
-
+	// do not do this async unless you're prepared to deal with mayhem
 	err = c.cache.Put(hash, blob)
-	return blob, err
+	if err != nil {
+		log.Errorf("error saving blob to underlying cache: %s", errors.FullTrace(err))
+	}
+	return blob, trace.Stack(time.Since(start), c.Name()), nil
 }
 
 // Put stores the blob in the origin and the cache
@@ -93,3 +99,9 @@ func (c *CachingStore) Delete(hash string) error {
 	}
 	return c.cache.Delete(hash)
 }
+
+// Shutdown shuts down the store gracefully
+func (c *CachingStore) Shutdown() {
+	c.origin.Shutdown()
+	c.cache.Shutdown()
+}

store/caching_test.go

@@ -6,6 +6,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/lbryio/reflector.go/shared"
+
 	"github.com/lbryio/lbry.go/v2/stream"
 )
 
@@ -51,13 +53,14 @@ func TestCachingStore_CacheMiss(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	res, err := s.Get(hash)
+	res, stack, err := s.Get(hash)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if !bytes.Equal(b, res) {
 		t.Errorf("expected Get() to return %s, got %s", string(b), string(res))
 	}
+	time.Sleep(10 * time.Millisecond) //storing to cache is done async so let's give it some time
 
 	has, err := cache.Has(hash)
 	if err != nil {
@@ -66,14 +69,16 @@ func TestCachingStore_CacheMiss(t *testing.T) {
 	if !has {
 		t.Errorf("Get() did not copy blob to cache")
 	}
+	t.Logf("stack: %s", stack.String())
 
-	res, err = cache.Get(hash)
+	res, stack, err = cache.Get(hash)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if !bytes.Equal(b, res) {
 		t.Errorf("expected cached Get() to return %s, got %s", string(b), string(res))
 	}
+	t.Logf("stack: %s", stack.String())
 }
 
 func TestCachingStore_ThunderingHerd(t *testing.T) {
@@ -92,7 +97,7 @@ func TestCachingStore_ThunderingHerd(t *testing.T) {
 	wg := &sync.WaitGroup{}
 
 	getNoErr := func() {
-		res, err := s.Get(hash)
+		res, _, err := s.Get(hash)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -148,7 +153,7 @@ func (s *SlowBlobStore) Has(hash string) (bool, error) {
 	return s.mem.Has(hash)
 }
 
-func (s *SlowBlobStore) Get(hash string) (stream.Blob, error) {
+func (s *SlowBlobStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
 	time.Sleep(s.delay)
 	return s.mem.Get(hash)
 }
@@ -167,3 +172,7 @@ func (s *SlowBlobStore) Delete(hash string) error {
 	time.Sleep(s.delay)
 	return s.mem.Delete(hash)
 }
+
+func (s *SlowBlobStore) Shutdown() {
+	return
+}

store/cloudfront_ro.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/lbryio/reflector.go/internal/metrics"
 	"github.com/lbryio/reflector.go/meta"
+	"github.com/lbryio/reflector.go/shared"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
@@ -49,30 +50,30 @@ func (c *CloudFrontROStore) Has(hash string) (bool, error) {
 }
 
 // Get gets the blob from Cloudfront.
-func (c *CloudFrontROStore) Get(hash string) (stream.Blob, error) {
+func (c *CloudFrontROStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
 	log.Debugf("Getting %s from S3", hash[:8])
+	start := time.Now()
 	defer func(t time.Time) {
 		log.Debugf("Getting %s from S3 took %s", hash[:8], time.Since(t).String())
-	}(time.Now())
+	}(start)
 
 	status, body, err := c.cfRequest(http.MethodGet, hash)
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), c.Name()), err
 	}
 	defer body.Close()
-
 	switch status {
 	case http.StatusNotFound, http.StatusForbidden:
-		return nil, errors.Err(ErrBlobNotFound)
+		return nil, shared.NewBlobTrace(time.Since(start), c.Name()), errors.Err(ErrBlobNotFound)
 	case http.StatusOK:
 		b, err := ioutil.ReadAll(body)
 		if err != nil {
-			return nil, errors.Err(err)
+			return nil, shared.NewBlobTrace(time.Since(start), c.Name()), errors.Err(err)
 		}
 		metrics.MtrInBytesS3.Add(float64(len(b)))
-		return b, nil
+		return b, shared.NewBlobTrace(time.Since(start), c.Name()), nil
 	default:
-		return nil, errors.Err("unexpected status %d", status)
+		return nil, shared.NewBlobTrace(time.Since(start), c.Name()), errors.Err("unexpected status %d", status)
 	}
 }
 
@@ -93,13 +94,17 @@ func (c *CloudFrontROStore) cfRequest(method, hash string) (int, io.ReadCloser,
 }
 
 func (c *CloudFrontROStore) Put(_ string, _ stream.Blob) error {
-	panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
+	return errors.Err(shared.ErrNotImplemented)
 }
 
 func (c *CloudFrontROStore) PutSD(_ string, _ stream.Blob) error {
-	panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
+	return errors.Err(shared.ErrNotImplemented)
 }
 
 func (c *CloudFrontROStore) Delete(_ string) error {
-	panic("CloudFrontROStore cannot do writes. Use CloudFrontRWStore")
+	return errors.Err(shared.ErrNotImplemented)
+}
+
+// Shutdown shuts down the store gracefully
+func (c *CloudFrontROStore) Shutdown() {
 }

store/cloudfront_rw.go

@@ -1,18 +1,22 @@
 package store
 
 import (
+	"time"
+
+	"github.com/lbryio/reflector.go/shared"
+
 	"github.com/lbryio/lbry.go/v2/stream"
 )
 
-// CloudFrontRWStore combines a Cloudfront and an S3 store. Reads go to Cloudfront, writes go to S3.
+// CloudFrontRWStore combines a Cloudfront and an S3 store. Reads go to Cloudfront/Wasabi, writes go to S3.
 type CloudFrontRWStore struct {
-	cf *CloudFrontROStore
+	cf *ITTTStore
 	s3 *S3Store
 }
 
 // NewCloudFrontRWStore returns an initialized CloudFrontRWStore store pointer.
 // NOTE: It panics if either argument is nil.
-func NewCloudFrontRWStore(cf *CloudFrontROStore, s3 *S3Store) *CloudFrontRWStore {
+func NewCloudFrontRWStore(cf *ITTTStore, s3 *S3Store) *CloudFrontRWStore {
 	if cf == nil || s3 == nil {
 		panic("both stores must be set")
 	}
@@ -30,8 +34,10 @@ func (c *CloudFrontRWStore) Has(hash string) (bool, error) {
 }
 
 // Get gets the blob from Cloudfront.
-func (c *CloudFrontRWStore) Get(hash string) (stream.Blob, error) {
+func (c *CloudFrontRWStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
-	return c.cf.Get(hash)
+	start := time.Now()
+	blob, trace, err := c.cf.Get(hash)
+	return blob, trace.Stack(time.Since(start), c.Name()), err
 }
 
 // Put stores the blob on S3
@@ -48,3 +54,9 @@ func (c *CloudFrontRWStore) PutSD(hash string, blob stream.Blob) error {
 func (c *CloudFrontRWStore) Delete(hash string) error {
 	return c.s3.Delete(hash)
 }
+
+// Shutdown shuts down the store gracefully
+func (c *CloudFrontRWStore) Shutdown() {
+	c.s3.Shutdown()
+	c.cf.Shutdown()
+}

store/dbbacked.go

@@ -3,8 +3,10 @@ package store
 import (
 	"encoding/json"
 	"sync"
+	"time"
 
 	"github.com/lbryio/reflector.go/db"
+	"github.com/lbryio/reflector.go/shared"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
@@ -14,15 +16,16 @@ import (
 
 // DBBackedStore is a store that's backed by a DB. The DB contains data about what's in the store.
 type DBBackedStore struct {
-	blobs     BlobStore
+	blobs        BlobStore
-	db        *db.SQL
+	db           *db.SQL
-	blockedMu sync.RWMutex
+	blockedMu    sync.RWMutex
-	blocked   map[string]bool
+	blocked      map[string]bool
+	deleteOnMiss bool
 }
 
 // NewDBBackedStore returns an initialized store pointer.
-func NewDBBackedStore(blobs BlobStore, db *db.SQL) *DBBackedStore {
+func NewDBBackedStore(blobs BlobStore, db *db.SQL, deleteOnMiss bool) *DBBackedStore {
-	return &DBBackedStore{blobs: blobs, db: db}
+	return &DBBackedStore{blobs: blobs, db: db, deleteOnMiss: deleteOnMiss}
 }
 
 const nameDBBacked = "db-backed"
@@ -32,20 +35,29 @@ func (d *DBBackedStore) Name() string { return nameDBBacked }
 
 // Has returns true if the blob is in the store
 func (d *DBBackedStore) Has(hash string) (bool, error) {
-	return d.db.HasBlob(hash)
+	return d.db.HasBlob(hash, false)
 }
 
 // Get gets the blob
-func (d *DBBackedStore) Get(hash string) (stream.Blob, error) {
+func (d *DBBackedStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
-	has, err := d.db.HasBlob(hash)
+	start := time.Now()
+	has, err := d.db.HasBlob(hash, true)
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), d.Name()), err
 	}
 	if !has {
-		return nil, ErrBlobNotFound
+		return nil, shared.NewBlobTrace(time.Since(start), d.Name()), ErrBlobNotFound
 	}
 
-	return d.blobs.Get(hash)
+	b, stack, err := d.blobs.Get(hash)
+	if d.deleteOnMiss && errors.Is(err, ErrBlobNotFound) {
+		e2 := d.Delete(hash)
+		if e2 != nil {
+			log.Errorf("error while deleting blob from db: %s", errors.FullTrace(err))
+		}
+	}
+
+	return b, stack.Stack(time.Since(start), d.Name()), err
 }
 
 // Put stores the blob in the S3 store and stores the blob information in the DB.
@@ -100,7 +112,7 @@ func (d *DBBackedStore) Block(hash string) error {
 		return err
 	}
 
-	has, err := d.db.HasBlob(hash)
+	has, err := d.db.HasBlob(hash, false)
 	if err != nil {
 		return err
 	}
@@ -182,3 +194,8 @@ func (d *DBBackedStore) initBlocked() error {
 
 	return err
 }
+
+// Shutdown shuts down the store gracefully
+func (d *DBBackedStore) Shutdown() {
+	d.blobs.Shutdown()
+}

store/disk.go

@@ -1,13 +1,25 @@
 package store
 
 import (
+	"bytes"
+	"crypto/sha512"
+	"encoding/hex"
+	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"path"
+	"time"
+
+	"github.com/lbryio/reflector.go/shared"
+	"github.com/lbryio/reflector.go/store/speedwalk"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
-	"github.com/lbryio/reflector.go/store/speedwalk"
+
+	"github.com/brk0v/directio"
+	log "github.com/sirupsen/logrus"
+	"go.uber.org/atomic"
 )
 
 // DiskStore stores blobs on a local disk
@@ -19,8 +31,12 @@ type DiskStore struct {
 
 	// true if initOnce ran, false otherwise
 	initialized bool
+
+	concurrentChecks atomic.Int32
 }
 
+const maxConcurrentChecks = 30
+
 // NewDiskStore returns an initialized file disk store pointer.
 func NewDiskStore(dir string, prefixLength int) *DiskStore {
 	return &DiskStore{
@@ -52,21 +68,40 @@ func (d *DiskStore) Has(hash string) (bool, error) {
 }
 
 // Get returns the blob or an error if the blob doesn't exist.
-func (d *DiskStore) Get(hash string) (stream.Blob, error) {
+func (d *DiskStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
 	err := d.initOnce()
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), d.Name()), err
 	}
 
 	blob, err := ioutil.ReadFile(d.path(hash))
 	if err != nil {
 		if os.IsNotExist(err) {
-			return nil, errors.Err(ErrBlobNotFound)
+			return nil, shared.NewBlobTrace(time.Since(start), d.Name()), errors.Err(ErrBlobNotFound)
 		}
-		return nil, errors.Err(err)
+		return nil, shared.NewBlobTrace(time.Since(start), d.Name()), errors.Err(err)
 	}
 
-	return blob, nil
+	// this is a rather poor yet effective way of throttling how many blobs can be checked concurrently
+	// poor because there is a possible race condition between the check and the actual +1
+	if d.concurrentChecks.Load() < maxConcurrentChecks {
+		d.concurrentChecks.Add(1)
+		defer d.concurrentChecks.Sub(1)
+		hashBytes := sha512.Sum384(blob)
+		readHash := hex.EncodeToString(hashBytes[:])
+		if hash != readHash {
+			message := fmt.Sprintf("[%s] found a broken blob while reading from disk. Actual hash: %s", hash, readHash)
+			log.Errorf("%s", message)
+			err := d.Delete(hash)
+			if err != nil {
+				return nil, shared.NewBlobTrace(time.Since(start), d.Name()), err
+			}
+			return nil, shared.NewBlobTrace(time.Since(start), d.Name()), errors.Err(message)
+		}
+	}
+
+	return blob, shared.NewBlobTrace(time.Since(start), d.Name()), nil
 }
 
 // Put stores the blob on disk
@@ -81,7 +116,25 @@ func (d *DiskStore) Put(hash string, blob stream.Blob) error {
 		return err
 	}
 
-	err = ioutil.WriteFile(d.path(hash), blob, 0644)
+	// Open file with O_DIRECT
+	f, err := os.OpenFile(d.tmpPath(hash), openFileFlags, 0644)
+	if err != nil {
+		return errors.Err(err)
+	}
+	defer f.Close()
+
+	// Use directio writer
+	dio, err := directio.New(f)
+	if err != nil {
+		return errors.Err(err)
+	}
+	defer dio.Flush()
+	// Write the body to file
+	_, err = io.Copy(dio, bytes.NewReader(blob))
+	if err != nil {
+		return errors.Err(err)
+	}
+	err = os.Rename(d.tmpPath(hash), d.path(hash))
 	return errors.Err(err)
 }
 
@@ -125,11 +178,15 @@ func (d *DiskStore) dir(hash string) string {
 	}
 	return path.Join(d.blobDir, hash[:d.prefixLength])
 }
-
+func (d *DiskStore) tmpDir(hash string) string {
+	return path.Join(d.blobDir, "tmp")
+}
 func (d *DiskStore) path(hash string) string {
 	return path.Join(d.dir(hash), hash)
 }
-
+func (d *DiskStore) tmpPath(hash string) string {
+	return path.Join(d.tmpDir(hash), hash)
+}
 func (d *DiskStore) ensureDirExists(dir string) error {
 	return errors.Err(os.MkdirAll(dir, 0755))
 }
@@ -143,7 +200,14 @@ func (d *DiskStore) initOnce() error {
 	if err != nil {
 		return err
 	}
-
+	err = d.ensureDirExists(path.Join(d.blobDir, "tmp"))
+	if err != nil {
+		return err
+	}
 	d.initialized = true
 	return nil
 }
+
+// Shutdown shuts down the store gracefully
+func (d *DiskStore) Shutdown() {
+}

store/disk_test.go

@@ -19,7 +19,7 @@ func TestDiskStore_Get(t *testing.T) {
 	defer os.RemoveAll(tmpDir)
 	d := NewDiskStore(tmpDir, 2)
 
-	hash := "1234567890"
+	hash := "f428b8265d65dad7f8ffa52922bba836404cbd62f3ecfe10adba6b444f8f658938e54f5981ac4de39644d5b93d89a94b"
 	data := []byte("oyuntyausntoyaunpdoyruoyduanrstjwfjyuwf")
 
 	expectedPath := path.Join(tmpDir, hash[:2], hash)
@@ -28,7 +28,7 @@ func TestDiskStore_Get(t *testing.T) {
 	err = ioutil.WriteFile(expectedPath, data, os.ModePerm)
 	require.NoError(t, err)
 
-	blob, err := d.Get(hash)
+	blob, _, err := d.Get(hash)
 	assert.NoError(t, err)
 	assert.EqualValues(t, data, blob)
 }
@@ -39,7 +39,7 @@ func TestDiskStore_GetNonexistentBlob(t *testing.T) {
 	defer os.RemoveAll(tmpDir)
 	d := NewDiskStore(tmpDir, 2)
 
-	blob, err := d.Get("nonexistent")
+	blob, _, err := d.Get("nonexistent")
 	assert.Nil(t, blob)
 	assert.True(t, errors.Is(err, ErrBlobNotFound))
 }

store/flags_darwin.go

@@ -0,0 +1,9 @@
+// +build darwin
+
+package store
+
+import (
+	"os"
+)
+
+var openFileFlags = os.O_WRONLY | os.O_CREATE

store/flags_linux.go

@@ -0,0 +1,10 @@
+// +build linux
+
+package store
+
+import (
+	"os"
+	"syscall"
+)
+
+var openFileFlags = os.O_WRONLY | os.O_CREATE | syscall.O_DIRECT

store/gcache.go

@@ -0,0 +1,159 @@
+package store
+
+import (
+	"time"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	"github.com/lbryio/lbry.go/v2/stream"
+
+	"github.com/bluele/gcache"
+	"github.com/sirupsen/logrus"
+)
+
+// GcacheStore adds a max cache size and Greedy-Dual-Size-Frequency cache eviction strategy to a BlobStore
+type GcacheStore struct {
+	// underlying store
+	store BlobStore
+	// cache implementation
+	cache gcache.Cache
+}
+type EvictionStrategy int
+
+const (
+	//LFU Discards the least frequently used items first.
+	LFU EvictionStrategy = iota
+	//ARC Constantly balances between LRU and LFU, to improve the combined result.
+	ARC
+	//LRU Discards the least recently used items first.
+	LRU
+	//SIMPLE has no clear priority for evict cache. It depends on key-value map order.
+	SIMPLE
+)
+
+// NewGcacheStore initialize a new LRUStore
+func NewGcacheStore(component string, store BlobStore, maxSize int, strategy EvictionStrategy) *GcacheStore {
+	cacheBuilder := gcache.New(maxSize)
+	var cache gcache.Cache
+	evictFunc := func(key interface{}, value interface{}) {
+		logrus.Infof("evicting %s", key)
+		metrics.CacheLRUEvictCount.With(metrics.CacheLabels(store.Name(), component)).Inc()
+		_ = store.Delete(key.(string)) // TODO: log this error. may happen if underlying entry is gone but cache entry still there
+	}
+	switch strategy {
+	case LFU:
+		cache = cacheBuilder.LFU().EvictedFunc(evictFunc).Build()
+	case ARC:
+		cache = cacheBuilder.ARC().EvictedFunc(evictFunc).Build()
+	case LRU:
+		cache = cacheBuilder.LRU().EvictedFunc(evictFunc).Build()
+	case SIMPLE:
+		cache = cacheBuilder.Simple().EvictedFunc(evictFunc).Build()
+
+	}
+	l := &GcacheStore{
+		store: store,
+		cache: cache,
+	}
+	go func() {
+		if lstr, ok := store.(lister); ok {
+			err := l.loadExisting(lstr, int(maxSize))
+			if err != nil {
+				panic(err) // TODO: what should happen here? panic? return nil? just keep going?
+			}
+		}
+	}()
+
+	return l
+}
+
+const nameGcache = "gcache"
+
+// Name is the cache type name
+func (l *GcacheStore) Name() string { return nameGcache }
+
+// Has returns whether the blob is in the store, without updating the recent-ness.
+func (l *GcacheStore) Has(hash string) (bool, error) {
+	return l.cache.Has(hash), nil
+}
+
+// Get returns the blob or an error if the blob doesn't exist.
+func (l *GcacheStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
+	_, err := l.cache.Get(hash)
+	if err != nil {
+		return nil, shared.NewBlobTrace(time.Since(start), l.Name()), errors.Err(ErrBlobNotFound)
+	}
+	blob, stack, err := l.store.Get(hash)
+	if errors.Is(err, ErrBlobNotFound) {
+		// Blob disappeared from underlying store
+		l.cache.Remove(hash)
+	}
+	return blob, stack.Stack(time.Since(start), l.Name()), err
+}
+
+// Put stores the blob. Following LFUDA rules it's not guaranteed that a SET will store the value!!!
+func (l *GcacheStore) Put(hash string, blob stream.Blob) error {
+	_ = l.cache.Set(hash, true)
+	has, _ := l.Has(hash)
+	if has {
+		err := l.store.Put(hash, blob)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// PutSD stores the sd blob. Following LFUDA rules it's not guaranteed that a SET will store the value!!!
+func (l *GcacheStore) PutSD(hash string, blob stream.Blob) error {
+	_ = l.cache.Set(hash, true)
+	has, _ := l.Has(hash)
+	if has {
+		err := l.store.PutSD(hash, blob)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Delete deletes the blob from the store
+func (l *GcacheStore) Delete(hash string) error {
+	err := l.store.Delete(hash)
+	if err != nil {
+		return err
+	}
+
+	// This must come after store.Delete()
+	// Remove triggers onEvict function, which also tries to delete blob from store
+	// We need to delete it manually first so any errors can be propagated up
+	l.cache.Remove(hash)
+	return nil
+}
+
+// loadExisting imports existing blobs from the underlying store into the LRU cache
+func (l *GcacheStore) loadExisting(store lister, maxItems int) error {
+	logrus.Infof("loading at most %d items", maxItems)
+	existing, err := store.list()
+	if err != nil {
+		return err
+	}
+	logrus.Infof("read %d files from underlying store", len(existing))
+
+	added := 0
+	for _, h := range existing {
+		_ = l.cache.Set(h, true)
+		added++
+		if maxItems > 0 && added >= maxItems { // underlying cache is bigger than the cache
+			break
+		}
+	}
+	return nil
+}
+
+// Shutdown shuts down the store gracefully
+func (l *GcacheStore) Shutdown() {
+}

store/gcache_test.go

@@ -1,10 +1,12 @@
 package store
 
 import (
+	"fmt"
 	"io/ioutil"
 	"os"
 	"reflect"
 	"testing"
+	"time"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 
@@ -12,93 +14,80 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-const cacheMaxBlobs = 3
+const cacheMaxSize = 3
 
-func getTestLRUStore() (*LRUStore, *MemStore) {
+func getTestGcacheStore() (*GcacheStore, *MemStore) {
 	m := NewMemStore()
-	return NewLRUStore("test", m, 3), m
+	return NewGcacheStore("test", m, cacheMaxSize, LFU), m
 }
 
-func TestLRUStore_Eviction(t *testing.T) {
+func TestGcacheStore_Eviction(t *testing.T) {
-	lru, mem := getTestLRUStore()
+	lfu, mem := getTestGcacheStore()
 	b := []byte("x")
-	err := lru.Put("one", b)
+	for i := 0; i < 3; i++ {
-	require.NoError(t, err)
+		err := lfu.Put(fmt.Sprintf("%d", i), b)
-	err = lru.Put("two", b)
+		require.NoError(t, err)
-	require.NoError(t, err)
+		for j := 0; j < 3-i; j++ {
-	err = lru.Put("three", b)
+			_, _, err = lfu.Get(fmt.Sprintf("%d", i))
-	require.NoError(t, err)
+			require.NoError(t, err)
-	err = lru.Put("four", b)
+		}
-	require.NoError(t, err)
+	}
-	err = lru.Put("five", b)
-	require.NoError(t, err)
-
-	assert.Equal(t, cacheMaxBlobs, len(mem.Debug()))
-
 	for k, v := range map[string]bool{
-		"one":   false,
+		"0": true,
-		"two":   false,
+		"1": true,
-		"three": true,
+		"2": true,
-		"four":  true,
-		"five":  true,
-		"six":   false,
 	} {
-		has, err := lru.Has(k)
+		has, err := lfu.Has(k)
 		assert.NoError(t, err)
 		assert.Equal(t, v, has)
 	}
-
+	err := lfu.Put("3", b)
-	lru.Get("three") // touch so it stays in cache
+	require.NoError(t, err)
-	lru.Put("six", b)
-
-	assert.Equal(t, cacheMaxBlobs, len(mem.Debug()))
-
 	for k, v := range map[string]bool{
-		"one":   false,
+		"0": true,
-		"two":   false,
+		"1": true,
-		"three": true,
+		"2": false,
-		"four":  false,
+		"3": true,
-		"five":  true,
-		"six":   true,
 	} {
-		has, err := lru.Has(k)
+		has, err := lfu.Has(k)
 		assert.NoError(t, err)
 		assert.Equal(t, v, has)
 	}
+	assert.Equal(t, cacheMaxSize, len(mem.Debug()))
 
-	err = lru.Delete("three")
+	err = lfu.Delete("0")
 	assert.NoError(t, err)
-	err = lru.Delete("five")
+	err = lfu.Delete("1")
 	assert.NoError(t, err)
-	err = lru.Delete("six")
+	err = lfu.Delete("3")
 	assert.NoError(t, err)
 	assert.Equal(t, 0, len(mem.Debug()))
 }
 
-func TestLRUStore_UnderlyingBlobMissing(t *testing.T) {
+func TestGcacheStore_UnderlyingBlobMissing(t *testing.T) {
-	lru, mem := getTestLRUStore()
+	lfu, mem := getTestGcacheStore()
 	hash := "hash"
 	b := []byte("this is a blob of stuff")
-	err := lru.Put(hash, b)
+	err := lfu.Put(hash, b)
 	require.NoError(t, err)
 
 	err = mem.Delete(hash)
 	require.NoError(t, err)
 
 	// hash still exists in lru
-	assert.True(t, lru.lru.Contains(hash))
+	assert.True(t, lfu.cache.Has(hash))
 
-	blob, err := lru.Get(hash)
+	blob, _, err := lfu.Get(hash)
 	assert.Nil(t, blob)
 	assert.True(t, errors.Is(err, ErrBlobNotFound), "expected (%s) %s, got (%s) %s",
 		reflect.TypeOf(ErrBlobNotFound).String(), ErrBlobNotFound.Error(),
 		reflect.TypeOf(err).String(), err.Error())
 
 	// lru.Get() removes hash if underlying store doesn't have it
-	assert.False(t, lru.lru.Contains(hash))
+	assert.False(t, lfu.cache.Has(hash))
 }
 
-func TestLRUStore_loadExisting(t *testing.T) {
+func TestGcacheStore_loadExisting(t *testing.T) {
 	tmpDir, err := ioutil.TempDir("", "reflector_test_*")
 	require.NoError(t, err)
 	defer os.RemoveAll(tmpDir)
@@ -114,8 +103,9 @@ func TestLRUStore_loadExisting(t *testing.T) {
 	require.Equal(t, 1, len(existing), "blob should exist in cache")
 	assert.Equal(t, hash, existing[0])
 
-	lru := NewLRUStore("test", d, 3) // lru should load existing blobs when it's created
+	lfu := NewGcacheStore("test", d, 3, LFU) // lru should load existing blobs when it's created
-	has, err := lru.Has(hash)
+	time.Sleep(100 * time.Millisecond)       // async load so let's wait...
+	has, err := lfu.Has(hash)
 	require.NoError(t, err)
 	assert.True(t, has, "hash should be loaded from disk store but it's not")
 }

store/http.go

@@ -0,0 +1,160 @@
+package store
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	"github.com/lbryio/lbry.go/v2/stream"
+)
+
+// HttpStore is a store that works on top of the HTTP protocol
+type HttpStore struct {
+	upstream   string
+	httpClient *http.Client
+}
+
+func NewHttpStore(upstream string) *HttpStore {
+	return &HttpStore{
+		upstream:   "http://" + upstream,
+		httpClient: getClient(),
+	}
+}
+
+const nameHttp = "http"
+
+func (n *HttpStore) Name() string { return nameHttp }
+func (n *HttpStore) Has(hash string) (bool, error) {
+	url := n.upstream + "/blob?hash=" + hash
+
+	req, err := http.NewRequest("HEAD", url, nil)
+	if err != nil {
+		return false, errors.Err(err)
+	}
+
+	res, err := n.httpClient.Do(req)
+	if err != nil {
+		return false, errors.Err(err)
+	}
+	defer res.Body.Close()
+	if res.StatusCode == http.StatusNotFound {
+		return false, nil
+	}
+	if res.StatusCode == http.StatusNoContent {
+		return true, nil
+	}
+	var body []byte
+	if res.Body != nil {
+		body, _ = ioutil.ReadAll(res.Body)
+	}
+	return false, errors.Err("upstream error. Status code: %d (%s)", res.StatusCode, string(body))
+}
+
+func (n *HttpStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
+	url := n.upstream + "/blob?hash=" + hash
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, shared.NewBlobTrace(time.Since(start), n.Name()), errors.Err(err)
+	}
+
+	res, err := n.httpClient.Do(req)
+	if err != nil {
+		return nil, shared.NewBlobTrace(time.Since(start), n.Name()), errors.Err(err)
+	}
+	defer res.Body.Close()
+	tmp := getBuffer()
+	defer putBuffer(tmp)
+	serialized := res.Header.Get("Via")
+	trace := shared.NewBlobTrace(time.Since(start), n.Name())
+	if serialized != "" {
+		parsedTrace, err := shared.Deserialize(serialized)
+		if err != nil {
+			return nil, shared.NewBlobTrace(time.Since(start), n.Name()), err
+		}
+		trace = *parsedTrace
+	}
+
+	if res.StatusCode == http.StatusNotFound {
+		return nil, trace.Stack(time.Since(start), n.Name()), ErrBlobNotFound
+	}
+	if res.StatusCode == http.StatusOK {
+		written, err := io.Copy(tmp, res.Body)
+		if err != nil {
+			return nil, trace.Stack(time.Since(start), n.Name()), errors.Err(err)
+		}
+
+		blob := make([]byte, written)
+		copy(blob, tmp.Bytes())
+		metrics.MtrInBytesHttp.Add(float64(len(blob)))
+		return blob, trace.Stack(time.Since(start), n.Name()), nil
+	}
+	var body []byte
+	if res.Body != nil {
+		body, _ = ioutil.ReadAll(res.Body)
+	}
+
+	return nil, trace.Stack(time.Since(start), n.Name()), errors.Err("upstream error. Status code: %d (%s)", res.StatusCode, string(body))
+}
+
+func (n *HttpStore) Put(string, stream.Blob) error {
+	return shared.ErrNotImplemented
+}
+func (n *HttpStore) PutSD(string, stream.Blob) error {
+	return shared.ErrNotImplemented
+}
+func (n *HttpStore) Delete(string) error {
+	return shared.ErrNotImplemented
+}
+func (n *HttpStore) Shutdown() {}
+
+// buffer pool to reduce GC
+// https://www.captaincodeman.com/2017/06/02/golang-buffer-pool-gotcha
+var buffers = sync.Pool{
+	// New is called when a new instance is needed
+	New: func() interface{} {
+		buf := make([]byte, 0, stream.MaxBlobSize)
+		return bytes.NewBuffer(buf)
+	},
+}
+
+// getBuffer fetches a buffer from the pool
+func getBuffer() *bytes.Buffer {
+	return buffers.Get().(*bytes.Buffer)
+}
+
+// putBuffer returns a buffer to the pool
+func putBuffer(buf *bytes.Buffer) {
+	buf.Reset()
+	buffers.Put(buf)
+}
+
+// getClient gets an http client that's customized to be more performant when dealing with blobs of 2MB in size (most of our blobs)
+func getClient() *http.Client {
+	// Customize the Transport to have larger connection pool
+	defaultTransport := &http.Transport{
+		DialContext: (&net.Dialer{
+			Timeout:   30 * time.Second,
+			KeepAlive: 30 * time.Second,
+		}).DialContext,
+		ForceAttemptHTTP2:     true,
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+		DisableCompression:    true,
+		MaxIdleConnsPerHost:   100,
+		ReadBufferSize:        stream.MaxBlobSize + 1024*10, //add an extra few KBs to make sure it fits the extra information
+	}
+
+	return &http.Client{Transport: defaultTransport}
+}

store/ittt.go

@@ -0,0 +1,73 @@
+package store
+
+import (
+	"time"
+
+	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
+
+	"github.com/lbryio/lbry.go/v2/extras/errors"
+	"github.com/lbryio/lbry.go/v2/stream"
+)
+
+// ITTTStore performs an operation on this storage, if this fails, it attempts to run it on that
+type ITTTStore struct {
+	this, that BlobStore
+}
+
+// NewITTTStore returns a new instance of the IF THIS THAN THAT store
+func NewITTTStore(this, that BlobStore) *ITTTStore {
+	return &ITTTStore{
+		this: this,
+		that: that,
+	}
+}
+
+const nameIttt = "ittt"
+
+// Name is the cache type name
+func (c *ITTTStore) Name() string { return nameIttt }
+
+// Has checks in this for a hash, if it fails it checks in that. It returns true if either store has it.
+func (c *ITTTStore) Has(hash string) (bool, error) {
+	has, err := c.this.Has(hash)
+	if err != nil || !has {
+		has, err = c.that.Has(hash)
+	}
+	return has, err
+}
+
+// Get tries to get the blob from this first, falling back to that.
+func (c *ITTTStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
+	blob, trace, err := c.this.Get(hash)
+	if err == nil {
+		metrics.ThisHitCount.Inc()
+		return blob, trace.Stack(time.Since(start), c.Name()), err
+	}
+
+	blob, trace, err = c.that.Get(hash)
+	if err != nil {
+		return nil, trace.Stack(time.Since(start), c.Name()), err
+	}
+	metrics.ThatHitCount.Inc()
+	return blob, trace.Stack(time.Since(start), c.Name()), nil
+}
+
+// Put not implemented
+func (c *ITTTStore) Put(hash string, blob stream.Blob) error {
+	return errors.Err(shared.ErrNotImplemented)
+}
+
+// PutSD not implemented
+func (c *ITTTStore) PutSD(hash string, blob stream.Blob) error {
+	return errors.Err(shared.ErrNotImplemented)
+}
+
+// Delete not implemented
+func (c *ITTTStore) Delete(hash string) error {
+	return errors.Err(shared.ErrNotImplemented)
+}
+
+// Shutdown shuts down the store gracefully
+func (c *ITTTStore) Shutdown() {}

store/lru.go

@@ -1,120 +0,0 @@
-package store
-
-import (
-	"github.com/lbryio/lbry.go/v2/extras/errors"
-	"github.com/lbryio/lbry.go/v2/stream"
-	"github.com/lbryio/reflector.go/internal/metrics"
-
-	golru "github.com/hashicorp/golang-lru"
-)
-
-// LRUStore adds a max cache size and LRU eviction to a BlobStore
-type LRUStore struct {
-	// underlying store
-	store BlobStore
-	// lru implementation
-	lru *golru.Cache
-}
-
-// NewLRUStore initialize a new LRUStore
-func NewLRUStore(component string, store BlobStore, maxItems int) *LRUStore {
-	lru, err := golru.NewWithEvict(maxItems, func(key interface{}, value interface{}) {
-		metrics.CacheLRUEvictCount.With(metrics.CacheLabels(store.Name(), component)).Inc()
-		_ = store.Delete(key.(string)) // TODO: log this error. may happen if underlying entry is gone but cache entry still there
-	})
-	if err != nil {
-		panic(err)
-	}
-
-	l := &LRUStore{
-		store: store,
-		lru:   lru,
-	}
-
-	if lstr, ok := store.(lister); ok {
-		err = l.loadExisting(lstr, maxItems)
-		if err != nil {
-			panic(err) // TODO: what should happen here? panic? return nil? just keep going?
-		}
-	}
-
-	return l
-}
-
-const nameLRU = "lru"
-
-// Name is the cache type name
-func (l *LRUStore) Name() string { return nameLRU }
-
-// Has returns whether the blob is in the store, without updating the recent-ness.
-func (l *LRUStore) Has(hash string) (bool, error) {
-	return l.lru.Contains(hash), nil
-}
-
-// Get returns the blob or an error if the blob doesn't exist.
-func (l *LRUStore) Get(hash string) (stream.Blob, error) {
-	_, has := l.lru.Get(hash)
-	if !has {
-		return nil, errors.Err(ErrBlobNotFound)
-	}
-	blob, err := l.store.Get(hash)
-	if errors.Is(err, ErrBlobNotFound) {
-		// Blob disappeared from underlying store
-		l.lru.Remove(hash)
-	}
-	return blob, err
-}
-
-// Put stores the blob
-func (l *LRUStore) Put(hash string, blob stream.Blob) error {
-	err := l.store.Put(hash, blob)
-	if err != nil {
-		return err
-	}
-
-	l.lru.Add(hash, true)
-	return nil
-}
-
-// PutSD stores the sd blob
-func (l *LRUStore) PutSD(hash string, blob stream.Blob) error {
-	err := l.store.PutSD(hash, blob)
-	if err != nil {
-		return err
-	}
-
-	l.lru.Add(hash, true)
-	return nil
-}
-
-// Delete deletes the blob from the store
-func (l *LRUStore) Delete(hash string) error {
-	err := l.store.Delete(hash)
-	if err != nil {
-		return err
-	}
-
-	// This must come after store.Delete()
-	// Remove triggers onEvict function, which also tries to delete blob from store
-	// We need to delete it manually first so any errors can be propagated up
-	l.lru.Remove(hash)
-	return nil
-}
-
-// loadExisting imports existing blobs from the underlying store into the LRU cache
-func (l *LRUStore) loadExisting(store lister, maxItems int) error {
-	existing, err := store.list()
-	if err != nil {
-		return err
-	}
-
-	added := 0
-	for _, h := range existing {
-		l.lru.Add(h, true)
-		added++
-		if maxItems > 0 && added >= maxItems { // underlying cache is bigger than LRU cache
-			break
-		}
-	}
-	return nil
-}

store/memory.go

@@ -2,6 +2,9 @@ package store
 
 import (
 	"sync"
+	"time"
+
+	"github.com/lbryio/reflector.go/shared"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
@@ -34,14 +37,15 @@ func (m *MemStore) Has(hash string) (bool, error) {
 }
 
 // Get returns the blob byte slice if present and errors if the blob is not found.
-func (m *MemStore) Get(hash string) (stream.Blob, error) {
+func (m *MemStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
 	m.mu.RLock()
 	defer m.mu.RUnlock()
 	blob, ok := m.blobs[hash]
 	if !ok {
-		return nil, errors.Err(ErrBlobNotFound)
+		return nil, shared.NewBlobTrace(time.Since(start), m.Name()), errors.Err(ErrBlobNotFound)
 	}
-	return blob, nil
+	return blob, shared.NewBlobTrace(time.Since(start), m.Name()), nil
 }
 
 // Put stores the blob in memory
@@ -71,3 +75,6 @@ func (m *MemStore) Debug() map[string]stream.Blob {
 	defer m.mu.RUnlock()
 	return m.blobs
 }
+
+// Shutdown shuts down the store gracefully
+func (m *MemStore) Shutdown() {}

store/memory_test.go

@@ -25,7 +25,7 @@ func TestMemStore_Get(t *testing.T) {
 		t.Error("error getting memory blob - ", err)
 	}
 
-	gotBlob, err := s.Get(hash)
+	gotBlob, _, err := s.Get(hash)
 	if err != nil {
 		t.Errorf("Expected no error, got %v", err)
 	}
@@ -33,7 +33,7 @@ func TestMemStore_Get(t *testing.T) {
 		t.Error("Got blob that is different from expected blob")
 	}
 
-	missingBlob, err := s.Get("nonexistent hash")
+	missingBlob, _, err := s.Get("nonexistent hash")
 	if err == nil {
 		t.Errorf("Expected ErrBlobNotFound, got nil")
 	}

store/noop.go

@@ -1,15 +1,24 @@
 package store
 
-import "github.com/lbryio/lbry.go/v2/stream"
+import (
+	"time"
+
+	"github.com/lbryio/reflector.go/shared"
+
+	"github.com/lbryio/lbry.go/v2/stream"
+)
 
 // NoopStore is a store that does nothing
 type NoopStore struct{}
 
 const nameNoop = "noop"
 
-func (n *NoopStore) Name() string                        { return nameNoop }
+func (n *NoopStore) Name() string               { return nameNoop }
-func (n *NoopStore) Has(_ string) (bool, error)          { return false, nil }
+func (n *NoopStore) Has(_ string) (bool, error) { return false, nil }
-func (n *NoopStore) Get(_ string) (stream.Blob, error)   { return nil, nil }
+func (n *NoopStore) Get(_ string) (stream.Blob, shared.BlobTrace, error) {
+	return nil, shared.NewBlobTrace(time.Since(time.Now()), n.Name()), nil
+}
 func (n *NoopStore) Put(_ string, _ stream.Blob) error   { return nil }
 func (n *NoopStore) PutSD(_ string, _ stream.Blob) error { return nil }
 func (n *NoopStore) Delete(_ string) error               { return nil }
+func (n *NoopStore) Shutdown()                           { return }

store/s3.go

@@ -5,9 +5,11 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
+
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
-	"github.com/lbryio/reflector.go/internal/metrics"
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/awserr"
@@ -65,17 +67,18 @@ func (s *S3Store) Has(hash string) (bool, error) {
 }
 
 // Get returns the blob slice if present or errors on S3.
-func (s *S3Store) Get(hash string) (stream.Blob, error) {
+func (s *S3Store) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
+	start := time.Now()
 	//Todo-Need to handle error for blob doesn't exist for consistency.
 	err := s.initOnce()
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), s.Name()), err
 	}
 
 	log.Debugf("Getting %s from S3", hash[:8])
 	defer func(t time.Time) {
 		log.Debugf("Getting %s from S3 took %s", hash[:8], time.Since(t).String())
-	}(time.Now())
+	}(start)
 
 	buf := &aws.WriteAtBuffer{}
 	_, err = s3manager.NewDownloader(s.session).Download(buf, &s3.GetObjectInput{
@@ -86,15 +89,15 @@ func (s *S3Store) Get(hash string) (stream.Blob, error) {
 		if aerr, ok := err.(awserr.Error); ok {
 			switch aerr.Code() {
 			case s3.ErrCodeNoSuchBucket:
-				return nil, errors.Err("bucket %s does not exist", s.bucket)
+				return nil, shared.NewBlobTrace(time.Since(start), s.Name()), errors.Err("bucket %s does not exist", s.bucket)
 			case s3.ErrCodeNoSuchKey:
-				return nil, errors.Err(ErrBlobNotFound)
+				return nil, shared.NewBlobTrace(time.Since(start), s.Name()), errors.Err(ErrBlobNotFound)
 			}
 		}
-		return buf.Bytes(), err
+		return buf.Bytes(), shared.NewBlobTrace(time.Since(start), s.Name()), err
 	}
 
-	return buf.Bytes(), nil
+	return buf.Bytes(), shared.NewBlobTrace(time.Since(start), s.Name()), nil
 }
 
 // Put stores the blob on S3 or errors if S3 connection errors.
@@ -110,10 +113,11 @@ func (s *S3Store) Put(hash string, blob stream.Blob) error {
 	}(time.Now())
 
 	_, err = s3manager.NewUploader(s.session).Upload(&s3manager.UploadInput{
-		Bucket:       aws.String(s.bucket),
+		Bucket: aws.String(s.bucket),
-		Key:          aws.String(hash),
+		Key:    aws.String(hash),
-		Body:         bytes.NewBuffer(blob),
+		Body:   bytes.NewBuffer(blob),
-		StorageClass: aws.String(s3.StorageClassIntelligentTiering),
+		ACL:    aws.String("public-read"),
+		//StorageClass: aws.String(s3.StorageClassIntelligentTiering),
 	})
 	metrics.MtrOutBytesReflector.Add(float64(blob.Size()))
 
@@ -150,6 +154,7 @@ func (s *S3Store) initOnce() error {
 	sess, err := session.NewSession(&aws.Config{
 		Credentials: credentials.NewStaticCredentials(s.awsID, s.awsSecret, ""),
 		Region:      aws.String(s.region),
+		Endpoint:    aws.String("https://s3.wasabisys.com"),
 	})
 	if err != nil {
 		return err
@@ -158,3 +163,8 @@ func (s *S3Store) initOnce() error {
 	s.session = sess
 	return nil
 }
+
+// Shutdown shuts down the store gracefully
+func (s *S3Store) Shutdown() {
+	return
+}

store/singleflight.go

@@ -4,7 +4,9 @@ import (
 	"time"
 
 	"github.com/lbryio/reflector.go/internal/metrics"
+	"github.com/lbryio/reflector.go/shared"
 
+	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
 
 	"golang.org/x/sync/singleflight"
@@ -29,39 +31,98 @@ func (s *singleflightStore) Name() string {
 	return "sf_" + s.BlobStore.Name()
 }
 
+type getterResponse struct {
+	blob  stream.Blob
+	stack shared.BlobTrace
+}
+
 // Get ensures that only one request per hash is sent to the origin at a time,
 // thereby protecting against https://en.wikipedia.org/wiki/Thundering_herd_problem
-func (s *singleflightStore) Get(hash string) (stream.Blob, error) {
+func (s *singleflightStore) Get(hash string) (stream.Blob, shared.BlobTrace, error) {
-	metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Inc()
+	start := time.Now()
-	defer metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Dec()
+	metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Inc()
+	defer metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Dec()
 
-	blob, err, _ := s.sf.Do(hash, s.getter(hash))
+	gr, err, _ := s.sf.Do(hash, s.getter(hash))
 	if err != nil {
-		return nil, err
+		return nil, shared.NewBlobTrace(time.Since(start), s.Name()), err
 	}
-	return blob.(stream.Blob), nil
+	if gr == nil {
+		return nil, shared.NewBlobTrace(time.Since(start), s.Name()), errors.Err("getter response is nil")
+	}
+	rsp := gr.(getterResponse)
+	return rsp.blob, rsp.stack, nil
 }
 
 // getter returns a function that gets a blob from the origin
 // only one getter per hash will be executing at a time
 func (s *singleflightStore) getter(hash string) func() (interface{}, error) {
 	return func() (interface{}, error) {
-		metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Inc()
+		metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Inc()
-		defer metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.BlobStore.Name(), s.component)).Dec()
+		defer metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Dec()
 
 		start := time.Now()
-		blob, err := s.BlobStore.Get(hash)
+		blob, stack, err := s.BlobStore.Get(hash)
+		if err != nil {
+			return getterResponse{
+				blob:  nil,
+				stack: stack.Stack(time.Since(start), s.Name()),
+			}, err
+		}
+
+		rate := float64(len(blob)) / 1024 / 1024 / time.Since(start).Seconds()
+		metrics.CacheRetrievalSpeed.With(map[string]string{
+			metrics.LabelCacheType: s.Name(),
+			metrics.LabelComponent: s.component,
+			metrics.LabelSource:    "origin",
+		}).Set(rate)
+
+		return getterResponse{
+			blob:  blob,
+			stack: stack.Stack(time.Since(start), s.Name()),
+		}, nil
+	}
+}
+
+// Put ensures that only one request per hash is sent to the origin at a time,
+// thereby protecting against https://en.wikipedia.org/wiki/Thundering_herd_problem
+func (s *singleflightStore) Put(hash string, blob stream.Blob) error {
+	metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Inc()
+	defer metrics.CacheWaitingRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Dec()
+
+	_, err, _ := s.sf.Do(hash, s.putter(hash, blob))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// putter returns a function that puts a blob from the origin
+// only one putter per hash will be executing at a time
+func (s *singleflightStore) putter(hash string, blob stream.Blob) func() (interface{}, error) {
+	return func() (interface{}, error) {
+		metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Inc()
+		defer metrics.CacheOriginRequestsCount.With(metrics.CacheLabels(s.Name(), s.component)).Dec()
+
+		start := time.Now()
+		err := s.BlobStore.Put(hash, blob)
 		if err != nil {
 			return nil, err
 		}
 
 		rate := float64(len(blob)) / 1024 / 1024 / time.Since(start).Seconds()
 		metrics.CacheRetrievalSpeed.With(map[string]string{
-			metrics.LabelCacheType: s.BlobStore.Name(),
+			metrics.LabelCacheType: s.Name(),
 			metrics.LabelComponent: s.component,
 			metrics.LabelSource:    "origin",
 		}).Set(rate)
 
-		return blob, nil
+		return nil, nil
 	}
 }
+
+// Shutdown shuts down the store gracefully
+func (s *singleflightStore) Shutdown() {
+	s.BlobStore.Shutdown()
+	return
+}

store/speedwalk/speedwalk.go

@@ -6,6 +6,8 @@ import (
 	"runtime"
 	"sync"
 
+	"github.com/lbryio/reflector.go/internal/metrics"
+
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 
 	"github.com/karrick/godirwalk"
@@ -24,6 +26,7 @@ func AllFiles(startDir string, basename bool) ([]string, error) {
 	paths := make([]string, 0, 1000)
 	pathWG := &sync.WaitGroup{}
 	pathWG.Add(1)
+	metrics.RoutinesQueue.WithLabelValues("speedwalk", "worker").Inc()
 	go func() {
 		defer pathWG.Done()
 		for {
@@ -60,7 +63,6 @@ func AllFiles(startDir string, basename bool) ([]string, error) {
 				walkerWG.Done()
 				goroutineLimiter <- struct{}{}
 			}()
-
 			err = godirwalk.Walk(filepath.Join(startDir, dir), &godirwalk.Options{
 				Unsorted: true, // faster this way
 				Callback: func(osPathname string, de *godirwalk.Dirent) error {
@@ -84,6 +86,5 @@ func AllFiles(startDir string, basename bool) ([]string, error) {
 
 	close(pathChan)
 	pathWG.Wait()
-
 	return paths, nil
 }

store/store.go

@@ -1,6 +1,8 @@
 package store
 
 import (
+	"github.com/lbryio/reflector.go/shared"
+
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 	"github.com/lbryio/lbry.go/v2/stream"
 )
@@ -9,16 +11,18 @@ import (
 type BlobStore interface {
 	// Name of blob store (useful for metrics)
 	Name() string
-	// Does blob exist in the store.
+	// Has Does blob exist in the store.
 	Has(hash string) (bool, error)
 	// Get the blob from the store. Must return ErrBlobNotFound if blob is not in store.
-	Get(hash string) (stream.Blob, error)
+	Get(hash string) (stream.Blob, shared.BlobTrace, error)
 	// Put the blob into the store.
 	Put(hash string, blob stream.Blob) error
-	// Put an SD blob into the store.
+	// PutSD an SD blob into the store.
 	PutSD(hash string, blob stream.Blob) error
 	// Delete the blob from the store.
 	Delete(hash string) error
+	// Shutdown the store gracefully
+	Shutdown()
 }
 
 // Blocklister is a store that supports blocking blobs to prevent their inclusion in the store.