LBRYCommunity/reflector.go
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when reflecting a sdblob, insert all the stream and intermediate blobs using a transaction #50

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shyba wants to merge 39 commits from insert_under_tx into master
pull from: insert_under_tx
merge into: LBRYCommunity:master
Conversation 5 Commits 39 Files changed 51 +357 -447
7 changed files with 357 additions and 447 deletions
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Showing only changes of commit 04f6859c74 - Show all commits

76
cmd/reflector.go
View file

@ -8,9 +8,10 @@ import (
"syscall"
"time"
"github.com/lbryio/lbry.go/v2/extras/errors"
"github.com/lbryio/lbry.go/v2/extras/stop"
"github.com/lbryio/reflector.go/db"
"github.com/lbryio/reflector.go/internal/metrics"
"github.com/lbryio/reflector.go/lite_db"
"github.com/lbryio/reflector.go/meta"
"github.com/lbryio/reflector.go/peer"
"github.com/lbryio/reflector.go/peer/http3"
@ -68,10 +69,11 @@ func init() {
func reflectorCmd(cmd *cobra.Command, args []string) {
log.Printf("reflector %s", meta.VersionString())
cleanerStopper := stop.New()
// the blocklist logic requires the db backed store to be the outer-most store
underlyingStore := setupStore()
outerStore := wrapWithCache(underlyingStore)
outerStore := wrapWithCache(underlyingStore, cleanerStopper)
if !disableUploads {
reflectorServer := reflector.NewServer(underlyingStore)
@ -102,13 +104,14 @@ func reflectorCmd(cmd *cobra.Command, args []string) {
metricsServer := metrics.NewServer(":"+strconv.Itoa(metricsPort), "/metrics")
metricsServer.Start()
defer metricsServer.Shutdown()
defer underlyingStore.Shutdown()
defer outerStore.Shutdown()
defer underlyingStore.Shutdown()
interruptChan := make(chan os.Signal, 1)
signal.Notify(interruptChan, os.Interrupt, syscall.SIGTERM)
<-interruptChan
// deferred shutdowns happen now
cleanerStopper.StopAndWait()
}
func setupStore() store.BlobStore {
@ -149,20 +152,20 @@ func setupStore() store.BlobStore {
}
if useDB {
db := new(db.SQL)
db.TrackAccessTime = true
err := db.Connect(globalConfig.DBConn)
dbInst := new(db.SQL)
dbInst.TrackAccess = db.TrackAccessStreams
err := dbInst.Connect(globalConfig.DBConn)
if err != nil {
log.Fatal(err)
}
s = store.NewDBBackedStore(s, db, false)
s = store.NewDBBackedStore(s, dbInst, false)
}
return s
}
func wrapWithCache(s store.BlobStore) store.BlobStore {
func wrapWithCache(s store.BlobStore, cleanerStopper *stop.Group) store.BlobStore {
wrapped := s
diskCacheMaxSize, diskCachePath := diskCacheParams(reflectorCmdDiskCache)
@ -174,17 +177,22 @@ func wrapWithCache(s store.BlobStore) store.BlobStore {
if err != nil {
log.Fatal(err)
}
localDb := new(lite_db.SQL)
localDb.TrackAccessTime = true
localDb := new(db.SQL)
localDb.SoftDelete = true
localDb.TrackAccess = db.TrackAccessBlobs
err = localDb.Connect("reflector:reflector@tcp(localhost:3306)/reflector")
if err != nil {
log.Fatal(err)
}
dbBackedDiskStore := store.NewDBBackedStore(store.NewDiskStore(diskCachePath, 2), localDb, false)
wrapped = store.NewCachingStore(
"reflector",
wrapped,
store.NewLiteDBBackedStore("hdd", store.NewDiskStore(diskCachePath, 2), localDb, int(realCacheSize)),
store.NewDBBackedStore(store.NewDiskStore(diskCachePath, 2), localDb, false),
)
go cleanOldestBlobs(int(realCacheSize), localDb, dbBackedDiskStore, cleanerStopper)
}
diskCacheMaxSize, diskCachePath = diskCacheParams(bufferReflectorCmdDiskCache)
@ -238,3 +246,49 @@ func diskCacheParams(diskParams string) (int, string) {
}
return int(maxSize), path
}
func cleanOldestBlobs(maxItems int, db *db.SQL, store store.BlobStore, stopper *stop.Group) {
const cleanupInterval = 10 * time.Second
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
}
for _, hash := range blobs {
select {
case <-stopper.Ch():
return nil
default:
}
err = store.Delete(hash)
if err != nil {
return err
}
}
}
return nil
}

264
db/db.go
View file

@ -30,11 +30,26 @@ type SdBlob struct {
StreamHash string `json:"stream_hash"`
}
type trackAccess int
const (
// Don't track accesses
TrackAccessNone trackAccess = iota
// Track accesses at the stream level
TrackAccessStreams
// Track accesses at the blob level
TrackAccessBlobs
)
// 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
}
func logQuery(query string, args ...interface{}) {
@ -78,11 +93,19 @@ func (s *SQL) insertBlob(hash string, length int, isStored bool) (int64, error)
return 0, errors.Err("length must be positive")
}
args := []interface{}{hash, isStored, length}
blobID, err := s.exec(
"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...,
var (
q string
args []interface{}
)
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 +118,33 @@ 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()}
streamID, err := s.exec(
"INSERT IGNORE INTO stream (hash, sd_blob_id, last_accessed_at) VALUES ("+qt.Qs(len(args))+")",
args...,
var (
q string
args []interface{}
)
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 +158,8 @@ 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 {
err := s.touch([]uint64{uint64(streamID)})
if s.TrackAccess == TrackAccessStreams {
err := s.touchStreams([]uint64{uint64(streamID)})
if err != nil {
return 0, errors.Err(err)
}
@ -140,12 +179,36 @@ 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) {
exists, streamsNeedingTouch, err := s.hasBlobs(hashes)
s.touch(streamsNeedingTouch)
exists, idsNeedingTouch, err := s.hasBlobs(hashes)
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 +222,7 @@ 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)
}
@ -170,7 +233,8 @@ func (s *SQL) hasBlobs(hashes []string) (map[string]bool, []uint64, error) {
var (
hash string
streamID uint64
blobID uint64
streamID null.Uint64
lastAccessedAt null.Time
)
@ -189,17 +253,23 @@ 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 lastAccessedAtSelect string
if s.TrackAccess == TrackAccessBlobs {
lastAccessedAtSelect = "b.last_accessed_at"
} else if s.TrackAccess == TrackAccessStreams {
lastAccessedAtSelect = "s.last_accessed_at"
} else {
lastAccessedAtSelect = "NULL"
}
query := `SELECT b.hash, s.id, s.last_accessed_at
query := `SELECT b.hash, b.id, s.id, ` + lastAccessedAtSelect + `
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)) + `)`
args := make([]interface{}, len(batch)+1)
args[0] = true
LEFT JOIN stream s on (sb.stream_id = s.id or s.sd_blob_id = b.id)
WHERE b.is_stored = 1 and b.hash IN (` + qt.Qs(len(batch)) + `)`
args := make([]interface{}, len(batch))
for i := range batch {
args[i+1] = batch[i]
args[i] = batch[i]
}
logQuery(query, args...)
@ -214,13 +284,17 @@ 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)) {
needsTouch = append(needsTouch, streamID)
if !lastAccessedAt.Valid || lastAccessedAt.Time.Before(touchDeadline) {
if s.TrackAccess == TrackAccessBlobs {
needsTouch = append(needsTouch, blobID)
} else if s.TrackAccess == TrackAccessStreams && !streamID.IsZero() {
needsTouch = append(needsTouch, streamID.Uint64)
}
}
}
@ -240,8 +314,14 @@ 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)
@ -251,6 +331,88 @@ func (s *SQL) Delete(hash string) error {
return errors.Err(err)
}
// GetHashRange gets the smallest and biggest hashes in the db
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 ?"
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
}
// AllHashes writes all hashes from the db into the channel.
// It does not close the channel when it finishes.
//func (s *SQL) AllHashes(ch chan<- string) error {
// if s.conn == nil {
// return errors.Err("not connected")
// }
//
// query := "SELECT hash from blob_"
// if s.SoftDelete {
// query += " where is_stored = 1"
// }
// logQuery(query)
//
// rows, err := s.conn.Query(query)
// if err != nil {
// return errors.Err(err)
// }
// defer closeRows(rows)
//
// for rows.Next() {
// var hash string
// err := rows.Scan(&hash)
// if err != nil {
// return errors.Err(err)
// }
// ch <- hash
// // TODO: this needs testing
// // TODO: need a way to cancel this early (e.g. in case of shutdown)
// }
//
// close(ch)
// return 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"
}
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 = ?"
@ -528,8 +690,10 @@ 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`)
);
CREATE TABLE stream (
@ -560,3 +724,47 @@ CREATE TABLE blocked (
);
*/
//func (d *LiteDBBackedStore) selfClean() {
// d.stopper.Add(1)
// defer d.stopper.Done()
// lastCleanup := time.Now()
// const cleanupInterval = 10 * time.Second
// for {
// select {
// case <-d.stopper.Ch():
// log.Infoln("stopping self cleanup")
// return
// default:
// time.Sleep(1 * time.Second)
// }
// if time.Since(lastCleanup) < cleanupInterval {
// continue
//
// blobsCount, err := d.db.BlobsCount()
// if err != nil {
// log.Errorf(errors.FullTrace(err))
// }
// if blobsCount >= d.maxItems {
// itemsToDelete := blobsCount / 100 * 10
// blobs, err := d.db.GetLRUBlobs(itemsToDelete)
// if err != nil {
// log.Errorf(errors.FullTrace(err))
// }
// for _, hash := range blobs {
// select {
// case <-d.stopper.Ch():
// return
// default:
//
// }
// err = d.Delete(hash)
// if err != nil {
// log.Errorf(errors.FullTrace(err))
// }
// metrics.CacheLRUEvictCount.With(metrics.CacheLabels(d.Name(), d.component)).Inc()
// }
// }
// lastCleanup = time.Now()
// }
//}

4
go.mod
View file

@ -12,8 +12,7 @@ require (
github.com/davecgh/go-spew v1.1.1
github.com/go-sql-driver/mysql v1.4.1
github.com/golang/protobuf v1.4.2
github.com/google/btree v1.0.0 // indirect
github.com/google/gops v0.3.7 // indirect
github.com/google/gops v0.3.7
github.com/gorilla/mux v1.7.4
github.com/hashicorp/go-msgpack v0.5.5 // indirect
github.com/hashicorp/golang-lru v0.5.4
@ -33,7 +32,6 @@ require (
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/pflag v1.0.3 // indirect
github.com/spf13/viper v1.7.1 // indirect
github.com/stretchr/testify v1.4.0
github.com/volatiletech/null v8.0.0+incompatible

348
lite_db/db.go
View file

@ -1,348 +0,0 @@
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
*/

4
store/caching_test.go
View file

@ -168,3 +168,7 @@ func (s *SlowBlobStore) Delete(hash string) error {
time.Sleep(s.delay)
return s.mem.Delete(hash)
}
func (s *SlowBlobStore) Shutdown() {
return
}

3
store/dbbacked.go
View file

@ -4,10 +4,9 @@ import (
"encoding/json"
"sync"
"github.com/lbryio/reflector.go/db"
"github.com/lbryio/lbry.go/v2/extras/errors"
"github.com/lbryio/lbry.go/v2/stream"
"github.com/lbryio/reflector.go/db"
log "github.com/sirupsen/logrus"
)

105
store/litedbbacked.go
View file

@ -2,12 +2,9 @@ package store
import (
"encoding/json"
"time"
"github.com/lbryio/lbry.go/v2/extras/stop"
"github.com/lbryio/reflector.go/db"
"github.com/lbryio/reflector.go/internal/metrics"
"github.com/lbryio/reflector.go/lite_db"
"github.com/lbryio/lbry.go/v2/extras/errors"
"github.com/lbryio/lbry.go/v2/stream"
@ -18,18 +15,15 @@ import (
// DBBackedStore is a store that's backed by a DB. The DB contains data about what's in the store.
type LiteDBBackedStore struct {
blobs BlobStore
db *lite_db.SQL
db *db.SQL
maxItems int
stopper *stop.Stopper
component string
}
// NewDBBackedStore returns an initialized store pointer.
func NewLiteDBBackedStore(component string, blobs BlobStore, db *lite_db.SQL, maxItems int) *LiteDBBackedStore {
func NewLiteDBBackedStore(component string, blobs BlobStore, db *db.SQL, maxItems int) *LiteDBBackedStore {
instance := &LiteDBBackedStore{blobs: blobs, db: db, maxItems: maxItems, stopper: stop.New(), component: component}
go func() {
instance.selfClean()
}()
return instance
}
@ -71,7 +65,7 @@ func (d *LiteDBBackedStore) Put(hash string, blob stream.Blob) error {
return err
}
return d.db.AddBlob(hash, len(blob))
return d.db.AddBlob(hash, len(blob), true)
}
// PutSD stores the SDBlob in the S3 store. It will return an error if the sd blob is missing the stream hash or if
@ -91,7 +85,7 @@ func (d *LiteDBBackedStore) PutSD(hash string, blob stream.Blob) error {
return err
}
return d.db.AddSDBlob(hash, len(blob))
return d.db.AddSDBlob(hash, len(blob), blobContents)
}
func (d *LiteDBBackedStore) Delete(hash string) error {
@ -105,53 +99,54 @@ func (d *LiteDBBackedStore) Delete(hash string) error {
// list returns the hashes of blobs that already exist in the database
func (d *LiteDBBackedStore) list() ([]string, error) {
blobs, err := d.db.AllBlobs()
return blobs, err
//blobs, err := d.db.AllBlobs()
//return blobs, err
return nil, nil
}
func (d *LiteDBBackedStore) selfClean() {
d.stopper.Add(1)
defer d.stopper.Done()
lastCleanup := time.Now()
const cleanupInterval = 10 * time.Second
for {
select {
case <-d.stopper.Ch():
log.Infoln("stopping self cleanup")
return
default:
time.Sleep(1 * time.Second)
}
if time.Since(lastCleanup) < cleanupInterval {
continue
}
blobsCount, err := d.db.BlobsCount()
if err != nil {
log.Errorf(errors.FullTrace(err))
}
if blobsCount >= d.maxItems {
itemsToDelete := blobsCount / 100 * 10
blobs, err := d.db.GetLRUBlobs(itemsToDelete)
if err != nil {
log.Errorf(errors.FullTrace(err))
}
for _, hash := range blobs {
select {
case <-d.stopper.Ch():
return
default:
}
err = d.Delete(hash)
if err != nil {
log.Errorf(errors.FullTrace(err))
}
metrics.CacheLRUEvictCount.With(metrics.CacheLabels(d.Name(), d.component)).Inc()
}
}
lastCleanup = time.Now()
}
}
//func (d *LiteDBBackedStore) selfClean() {
// d.stopper.Add(1)
// defer d.stopper.Done()
// lastCleanup := time.Now()
// const cleanupInterval = 10 * time.Second
// for {
// select {
// case <-d.stopper.Ch():
// log.Infoln("stopping self cleanup")
// return
// default:
// time.Sleep(1 * time.Second)
// }
// if time.Since(lastCleanup) < cleanupInterval {
// continue
// }
// blobsCount, err := d.db.BlobsCount()
// if err != nil {
// log.Errorf(errors.FullTrace(err))
// }
// if blobsCount >= d.maxItems {
// itemsToDelete := blobsCount / 100 * 10
// blobs, err := d.db.GetLRUBlobs(itemsToDelete)
// if err != nil {
// log.Errorf(errors.FullTrace(err))
// }
// for _, hash := range blobs {
// select {
// case <-d.stopper.Ch():
// return
// default:
//
// }
// err = d.Delete(hash)
// if err != nil {
// log.Errorf(errors.FullTrace(err))
// }
// metrics.CacheLRUEvictCount.With(metrics.CacheLabels(d.Name(), d.component)).Inc()
// }
// }
// lastCleanup = time.Now()
// }
//}
// Shutdown shuts down the store gracefully
func (d *LiteDBBackedStore) Shutdown() {