diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..af392e0 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ + +config.json diff --git a/blobsdownloader/tcp.go b/blobsdownloader/tcp.go new file mode 100644 index 0000000..9771171 --- /dev/null +++ b/blobsdownloader/tcp.go @@ -0,0 +1,72 @@ +package blobsdownloader + +import ( + "encoding/hex" + "io/ioutil" + "os" + "time" + + "voidwalker/configs" + + "github.com/lbryio/lbry.go/v2/extras/errors" + "github.com/lbryio/lbry.go/v2/stream" + "github.com/lbryio/reflector.go/peer" + "github.com/lbryio/reflector.go/store" +) + +func DownloadBlob(hash string, save bool, blobsDir string) (*stream.Blob, error) { + bStore := GetBlobStore() + blob, err := bStore.Get(hash) + if err != nil { + err = errors.Prefix(hash, err) + return nil, errors.Err(err) + } + if save { + err = os.MkdirAll(blobsDir, os.ModePerm) + if err != nil { + return nil, errors.Err(err) + } + err = ioutil.WriteFile(blobsDir+hash, blob, 0644) + if err != nil { + return nil, errors.Err(err) + } + } + return &blob, nil +} + +// GetBlobStore returns default pre-configured blob store. +func GetBlobStore() store.BlobStore { + return peer.NewStore(peer.StoreOpts{ + Address: configs.Configuration.ReflectorServer, + Timeout: 30 * time.Second, + }) +} + +// downloads a stream and returns the speed in bytes per second +func DownloadStream(blob *stream.SDBlob, blobsDir string) error { + hashes := GetStreamHashes(blob) + for _, hash := range hashes { + _, err := os.Stat(blobsDir + hash) + if os.IsNotExist(err) { + _, err := DownloadBlob(hash, true, blobsDir) + if err != nil { + return err + } + } else if err != nil { + return errors.Err(err) + } + } + return nil +} + +func GetStreamHashes(blob *stream.SDBlob) []string { + blobs := make([]string, 0, len(blob.BlobInfos)) + for _, b := range blob.BlobInfos { + hash := hex.EncodeToString(b.BlobHash) + if hash == "" { + continue + } + blobs = append(blobs, hex.EncodeToString(b.BlobHash)) + } + return blobs +} diff --git a/chainquery/chainquery.go b/chainquery/chainquery.go new file mode 100644 index 0000000..5c1de29 --- /dev/null +++ b/chainquery/chainquery.go @@ -0,0 +1,115 @@ +package chainquery + +import ( + "database/sql" + "fmt" + "sync" + "time" + + "voidwalker/configs" + + "github.com/lbryio/lbry.go/v2/extras/errors" + "github.com/sirupsen/logrus" + + _ "github.com/go-sql-driver/mysql" +) + +type CQApi struct { + dbConn *sql.DB + cache *sync.Map +} + +var instance *CQApi +var ClaimNotFoundErr = errors.Base("claim not found") + +func Init() (*CQApi, error) { + if instance != nil { + return instance, nil + } + db, err := connect() + if err != nil { + return nil, err + } + instance = &CQApi{ + cache: &sync.Map{}, + dbConn: db, + } + return instance, nil +} + +func connect() (*sql.DB, error) { + db, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s)/%s?parseTime=true", configs.Configuration.Chainquery.User, configs.Configuration.Chainquery.Password, configs.Configuration.Chainquery.Host, configs.Configuration.Chainquery.Database)) + return db, errors.Err(err) +} + +type Claim struct { + ClaimID string `json:"claim_id"` + SdHash string `json:"sd_hash"` + ContentType string `json:"content_type"` +} +type ChainqueryCache struct { + lastFetched time.Time + claim *Claim +} + +func (c *CQApi) ResolveClaim(claimName, shortID string) (*Claim, error) { + cached, ok := c.cache.Load(claimName + shortID) + if ok { + cachedCasted, _ := cached.(ChainqueryCache) + if cachedCasted.lastFetched.After(time.Now().Add(-5 * time.Minute)) { + logrus.Infoln("loaded from cache") + return cachedCasted.claim, nil + } + } + query := "SELECT claim_id, sd_hash, content_type FROM claim where name = ? AND claim_id LIKE ?" + rows, err := c.dbConn.Query(query, claimName, fmt.Sprintf("%s%%", shortID)) + if err != nil { + return nil, errors.Err(err) + } + defer rows.Close() + + for rows.Next() { + var claim Claim + err = rows.Scan(&claim.ClaimID, &claim.SdHash, &claim.ContentType) + if err != nil { + return nil, errors.Err(err) + } + c.cache.Store(claimName+shortID, ChainqueryCache{ + lastFetched: time.Now(), + claim: &claim, + }) + return &claim, nil + } + return nil, ClaimNotFoundErr +} + +func (c *CQApi) ResolveClaimByChannel(claimName, channelID, channelName string) (*Claim, error) { + cached, ok := c.cache.Load(claimName + channelID) + if ok { + cachedCasted, _ := cached.(ChainqueryCache) + if cachedCasted.lastFetched.After(time.Now().Add(-5 * time.Minute)) { + logrus.Infoln("loaded from cache") + return cachedCasted.claim, nil + } + } + query := "SELECT claim_id, sd_hash, content_type FROM claim where name = ? AND publisher_id = (select claim_id from claim where claim_id like ? and name = ? order by id desc limit 1)" + rows, err := c.dbConn.Query(query, claimName, fmt.Sprintf("%s%%", channelID), channelName) + if err != nil { + return nil, errors.Err(err) + } + defer rows.Close() + + for rows.Next() { + var claim Claim + err = rows.Scan(&claim.ClaimID, &claim.SdHash, &claim.ContentType) + if err != nil { + return nil, errors.Err(err) + } + c.cache.Store(claimName+channelID, ChainqueryCache{ + lastFetched: time.Now(), + claim: &claim, + }) + return &claim, nil + } + return nil, ClaimNotFoundErr +} diff --git a/config.json.example b/config.json.example new file mode 100644 index 0000000..0b572cd --- /dev/null +++ b/config.json.example @@ -0,0 +1,17 @@ +{ + "chainquery": { + "host": "chainquery.lbry.com", + "user": "user", + "database": "chainquery", + "password": "password" + }, + "speech": { + "host": "localhost", + "user": "lbry", + "database": "lbry", + "password": "password" + }, + "channel_id": "", + "publish_address": "", + "reflector_server": "reflector.lbry.com:5567" +} \ No newline at end of file diff --git a/configs/configs.go b/configs/configs.go new file mode 100644 index 0000000..2531d3d --- /dev/null +++ b/configs/configs.go @@ -0,0 +1,35 @@ +package configs + +import ( + "github.com/lbryio/lbry.go/v2/extras/errors" + "github.com/tkanos/gonfig" +) + +type DbConfig struct { + Host string `json:"host"` + User string `json:"user"` + Database string `json:"database"` + Password string `json:"password"` +} +type Configs struct { + Chainquery DbConfig `json:"chainquery"` + Speech DbConfig `json:"speech"` + ChannelID string `json:"channel_id"` + PublishAddress string `json:"publish_address"` + ReflectorServer string `json:"reflector_server"` +} + +var Configuration *Configs + +func Init(configPath string) error { + if Configuration != nil { + return nil + } + c := Configs{} + err := gonfig.GetConf(configPath, &c) + if err != nil { + return errors.Err(err) + } + Configuration = &c + return nil +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..1c6f1b2 --- /dev/null +++ b/go.mod @@ -0,0 +1,15 @@ +module voidwalker + +go 1.14 + +require ( + github.com/gabriel-vasile/mimetype v1.0.5 + github.com/ghodss/yaml v1.0.0 // indirect + github.com/gin-contrib/cors v1.3.1 + github.com/gin-gonic/gin v1.6.2 + github.com/go-sql-driver/mysql v1.5.0 + github.com/lbryio/lbry.go/v2 v2.5.3 + github.com/lbryio/reflector.go v1.1.2 + github.com/sirupsen/logrus v1.4.2 + github.com/tkanos/gonfig v0.0.0-20181112185242-896f3d81fadf +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..3f4f521 --- /dev/null +++ b/go.sum @@ -0,0 +1,333 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ= +github.com/aead/siphash 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v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo= +gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw= +honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/main.go b/main.go new file mode 100644 index 0000000..8c15eba --- /dev/null +++ b/main.go @@ -0,0 +1,420 @@ +package main + +import ( + "bufio" + "bytes" + "crypto/sha256" + "encoding/hex" + "fmt" + "io" + "io/ioutil" + "net/http" + "os" + "os/user" + "path/filepath" + "strings" + "sync" + "time" + + "voidwalker/blobsdownloader" + "voidwalker/chainquery" + "voidwalker/configs" + ml "voidwalker/util" + + "github.com/gabriel-vasile/mimetype" + "github.com/gin-contrib/cors" + "github.com/gin-gonic/gin" + "github.com/lbryio/lbry.go/v2/extras/errors" + "github.com/lbryio/lbry.go/v2/extras/jsonrpc" + "github.com/lbryio/lbry.go/v2/extras/util" + "github.com/lbryio/lbry.go/v2/stream" + "github.com/sirupsen/logrus" +) + +var publishAddress string +var channelID string +var cqApi *chainquery.CQApi +var downloadsDir string +var uploadsDir string +var blobsDir string +var viewLock ml.MultipleLock +var publishLock ml.MultipleLock + +func main() { + err := configs.Init("./config.json") + if err != nil { + panic(err) + } + publishAddress = configs.Configuration.PublishAddress + channelID = configs.Configuration.ChannelID + if publishAddress == "" || channelID == "" { + panic("publish_address or channel_id undefined!") + } + initLbrynet() + cqApi, err = chainquery.Init() + if err != nil { + panic(err) + } + usr, err := user.Current() + if err != nil { + panic(err) + } + uploadsDir = usr.HomeDir + "/Uploads/" + downloadsDir = usr.HomeDir + "/Downloads/" + blobsDir = usr.HomeDir + "/.lbrynet/blobfiles/" + viewLock = ml.NewMultipleLock() + publishLock = ml.NewMultipleLock() + + cache = &sync.Map{} + + r := gin.Default() + corsConfig := cors.DefaultConfig() + corsConfig.AllowOrigins = []string{"*"} + r.Use(cors.New(corsConfig)) + r.POST("/api/claim/publish", publish) + r.GET("/view/:id/:claimname", view) + r.MaxMultipartMemory = 8 << 20 // 8 MiB + r.Run(":5000") +} + +var daemon *jsonrpc.Client + +func view(c *gin.Context) { + id := c.Param("id") + claimNameWithExt := c.Param("claimname") + claimName := strings.TrimSuffix(claimNameWithExt, filepath.Ext(claimNameWithExt)) + if strings.HasSuffix(claimName, ".") { + logrus.Errorf("claim %s#%s has an extra dot in the end of the name!", claimName, id) + claimName = strings.TrimSuffix(claimName, ".") + } + viewLock.Lock(claimName + id) + defer viewLock.Unlock(claimName + id) + channelName := "" + channelShortID := "" + var claim *chainquery.Claim + var err error + if strings.Contains(id, "@") { + parts := strings.Split(id, ":") + channelName = parts[0] + if len(parts) > 1 { + channelShortID = parts[1] + } + + claim, err = cqApi.ResolveClaimByChannel(claimName, channelShortID, channelName) + } else { + claim, err = cqApi.ResolveClaim(claimName, id) + } + if err != nil { + if errors.Is(err, chainquery.ClaimNotFoundErr) { + _ = c.AbortWithError(http.StatusNotFound, err) + } else { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, err) + } + return + } + if !strings.Contains(claim.ContentType, "image/") { + c.Redirect(301, fmt.Sprintf("https://cdn.lbryplayer.xyz/content/claims/%s/%s/stream", claimName, id)) + return + } + + inUploads, err := isFileInDir(uploadsDir, claimNameWithExt) + if err != nil { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, err) + return + } + inDownloads := false + if !inUploads { + inDownloads, err = isFileInDir(downloadsDir, claimNameWithExt) + if err != nil { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, err) + return + } + } + mustDownload := !inUploads && !inDownloads + if mustDownload { + err = downloadStream(claim.SdHash, claimNameWithExt) + if err != nil { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, err) + return + } + } + + var reader *os.File + if mustDownload || inDownloads { + reader, err = os.Open(downloadsDir + claimNameWithExt) + if err != nil { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + } else { + reader, err = os.Open(uploadsDir + claimNameWithExt) + if err != nil { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + } + defer reader.Close() + f, err := reader.Stat() + if err != nil { + logrus.Errorln(errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + c.DataFromReader(http.StatusOK, f.Size(), claim.ContentType, reader, nil) + return + +} + +func isFileInDir(directory, fileName string) (bool, error) { + _, err := os.Stat(directory + fileName) + if os.IsNotExist(err) { + return false, nil + } + if err != nil { + return false, errors.Err(err) + } + return true, nil +} + +func buildStream(sdBlob *stream.SDBlob, fileName string) error { + tmpName := downloadsDir + fileName + ".tmp" + finalName := downloadsDir + fileName + f, err := os.Create(tmpName) + if err != nil { + return errors.Err(err) + } + w := bufio.NewWriter(f) + for _, info := range sdBlob.BlobInfos { + if info.Length == 0 { + continue + } + hash := hex.EncodeToString(info.BlobHash) + blobToDecrypt, err := ioutil.ReadFile(blobsDir + hash) + if err != nil { + return errors.Err(err) + } + decryptedBlob, err := stream.DecryptBlob(blobToDecrypt, sdBlob.Key, info.IV) + if err != nil { + return errors.Err(err) + } + _, err = w.Write(decryptedBlob) + if err != nil { + return errors.Err(err) + } + err = w.Flush() + if err != nil { + return errors.Err(err) + } + } + err = os.Rename(tmpName, finalName) + if err != nil { + return errors.Err(err) + } + return nil +} + +func downloadStream(sdHash string, fileName string) error { + sdBlob, err := blobsdownloader.DownloadBlob(sdHash, false, blobsDir) + if err != nil { + return err + } + sdb := &stream.SDBlob{} + err = sdb.FromBlob(*sdBlob) + + if err != nil { + return err + } + err = blobsdownloader.DownloadStream(sdb, blobsDir) + if err != nil { + return err + } + return buildStream(sdb, fileName) +} + +//var cache map[string]PublishResponse +var cache *sync.Map //map[string]PublishResponse + +func publish(c *gin.Context) { + startTime := time.Now() + claimName := c.PostForm("name") + + fileHeader, err := c.FormFile("file") + if err != nil { + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + + file, err := fileHeader.Open() + if err != nil { + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + defer file.Close() + buf := bytes.NewBuffer(nil) + + read, err := io.Copy(buf, file) + if err != nil { + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + + if read < 1 { + _ = c.AbortWithError(http.StatusBadRequest, errors.Err("the uploaded file was empty")) + return + } + mimeType := mimetype.Detect(buf.Bytes()) + mimeString := mimetype.Detect(buf.Bytes()).String() + if strings.Contains(mimeString, "image/") { + checkSum := fmt.Sprintf("%x", sha256.Sum256(buf.Bytes())) + publishLock.Lock(checkSum) + defer publishLock.Unlock(checkSum) + filePath := uploadsDir + checkSum[:16] + mimeType.Extension() + err = c.SaveUploadedFile(fileHeader, filePath) + if err != nil { + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + resolveRsp, err := daemon.Resolve(checkSum[:16]) + if err != nil { + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + cachedUncasted, ok := cache.Load(checkSum[:16]) + if ok { + cached, _ := cachedUncasted.(PublishResponse) + logrus.Infof("returning cached resource: %s", cached.Data.ServeURL) + c.JSON(http.StatusOK, cached) + return + } + for _, claim := range *resolveRsp { + if claim.SigningChannel != nil && claim.SigningChannel.ClaimID == channelID { + baseUrl := "https://spee.ch/" + claim.ClaimID[0:1] + "/" + checkSum[:16] + extendedUrl := baseUrl + mimeType.Extension() + response := PublishResponse{ + Success: true, + Message: "publish completed successfully", + Data: &PublishData{ + Name: checkSum[:16], + ClaimID: claim.ClaimID, + URL: baseUrl, + ShowURL: baseUrl, + ServeURL: extendedUrl, + PushTo: claim.ClaimID[0:1] + "/" + checkSum[:16], + ClaimData: ClaimData{ + Name: checkSum[:16], + ClaimID: claim.ClaimID, + Title: checkSum[:16], + Description: "", + Address: claim.Address, + Outpoint: claim.Txid + ":" + fmt.Sprintf("%d", claim.Nout), + Height: claim.Height, + ContentType: claim.Type, + Amount: claim.Amount, + CertificateID: nil, + ChannelName: nil, + }, + }, + } + logrus.Infof("returning resolved resource: %s", extendedUrl) + if strings.Contains(extendedUrl, "..") { + logrus.Errorf("something is wrong with this crap: %+v", claim) + } + c.JSON(http.StatusOK, response) + cache.Store(checkSum[:16], response) + return + } + } + tx, err := daemon.StreamCreate(checkSum[:16], filePath, 0.001, jsonrpc.StreamCreateOptions{ + ClaimCreateOptions: jsonrpc.ClaimCreateOptions{ + Title: util.PtrToString(claimName), + ClaimAddress: util.PtrToString(publishAddress), + }, + Author: util.PtrToString("voidwalker thumbnails"), + ChannelID: util.PtrToString(channelID), + }) + if err != nil { + logrus.Errorf("failed publishing thumbnail: %s", errors.FullTrace(err)) + _ = c.AbortWithError(http.StatusInternalServerError, errors.Err(err)) + return + } + baseURL := "https://spee.ch/" + tx.Outputs[0].ClaimID[0:1] + "/" + checkSum[:16] + extendedUrl := baseURL + mimeType.Extension() + logrus.Infof("published thumbnail: %s in %s", extendedUrl, time.Since(startTime).String()) + response := PublishResponse{ + Success: true, + Message: "publish completed successfully", + Data: &PublishData{ + Name: checkSum[:16], + ClaimID: tx.Outputs[0].ClaimID, + URL: baseURL, + ShowURL: baseURL, + ServeURL: extendedUrl, + PushTo: tx.Outputs[0].ClaimID[0:1] + "/" + checkSum[:16], + ClaimData: ClaimData{ + Name: checkSum[:16], + ClaimID: tx.Outputs[0].ClaimID, + Title: checkSum[:16], + Description: "", + Address: tx.Outputs[0].Address, + Outpoint: tx.Outputs[0].Txid + ":" + fmt.Sprintf("%d", tx.Outputs[0].Nout), + Height: tx.Outputs[0].Height, + ContentType: tx.Outputs[0].Type, + Amount: tx.Outputs[0].Amount, + CertificateID: nil, + ChannelName: nil, + }, + }, + } + if strings.Contains(extendedUrl, "..") { + logrus.Errorf("something is wrong with this crap: %+v", tx.Outputs[0]) + } + cache.Store(checkSum[:16], response) + c.JSON(http.StatusOK, response) + return + } + c.JSON(http.StatusBadRequest, PublishResponse{ + Success: false, + Message: fmt.Sprintf("the provided content (%s) is not supported anymore. Only images allowed. use https://lbry.tv instead", mimeString), + Data: nil, + }) +} + +type PublishResponse struct { + Success bool `json:"success"` + Message string `json:"message"` + Data *PublishData `json:"data"` +} + +type PublishData struct { + Name string `json:"name"` + ClaimID string `json:"claimId"` + URL string `json:"url"` + ShowURL string `json:"showUrl"` + ServeURL string `json:"serveUrl"` + PushTo string `json:"pushTo"` + ClaimData ClaimData `json:"claimData"` +} +type ClaimData struct { + Name string `json:"name"` + ClaimID string `json:"claimId"` + Title string `json:"title"` + Description string `json:"description"` + Address string `json:"address"` + Outpoint string `json:"outpoint"` + Height int `json:"height"` + ContentType string `json:"contentType"` + Amount string `json:"amount"` + CertificateID *string `json:"certificateId"` + ChannelName *string `json:"channelName"` +} + +func initLbrynet() { + daemon = jsonrpc.NewClient("") + daemon.SetRPCTimeout(1 * time.Minute) +} diff --git a/speech/speech.go b/speech/speech.go new file mode 100644 index 0000000..dfd0797 --- /dev/null +++ b/speech/speech.go @@ -0,0 +1,36 @@ +package speech + +import ( + "database/sql" + "fmt" + "os" + + "github.com/lbryio/lbry.go/v2/extras/errors" + + _ "github.com/go-sql-driver/mysql" +) + +type Speech struct { + dbConn *sql.DB +} + +var instance *Speech + +func Init() (*Speech, error) { + if instance != nil { + return instance, nil + } + db, err := connect() + if err != nil { + return nil, err + } + instance = &Speech{ + dbConn: db, + } + return instance, nil +} + +func connect() (*sql.DB, error) { + db, err := sql.Open("mysql", fmt.Sprintf("lbry:%s@tcp(localhost)/lbry?parseTime=true", os.Getenv("MYSQL_LBRY_PASSWORD"))) + return db, errors.Err(err) +} diff --git a/util/multiplelock.go b/util/multiplelock.go new file mode 100644 index 0000000..9ad22ca --- /dev/null +++ b/util/multiplelock.go @@ -0,0 +1,96 @@ +package ml + +import ( + "sync" +) + +// MultipleLock is the main interface for multiLock based on key +type MultipleLock interface { + // Lock base on the key + Lock(interface{}) + + // RLock multiLock the rw for reading + RLock(interface{}) + + // Unlock the key + Unlock(interface{}) + + // RUnlock the the read multiLock + RUnlock(interface{}) +} + +func NewMultipleLock() MultipleLock { + return &multiLock{ + locks: make(map[interface{}]*itemLock), + lkMux: sync.Mutex{}, + } +} + +type itemLock struct { + lk *sync.RWMutex + cnt int64 +} + +// multiLock is an optimized locking system per locking key +type multiLock struct { + locks map[interface{}]*itemLock + lkMux sync.Mutex // protects the locks +} + +func (l *multiLock) Lock(itmID interface{}) { + l.lkMux.Lock() + itmLock, exists := l.locks[itmID] + if !exists { + itmLock = &itemLock{&sync.RWMutex{}, 0} + l.locks[itmID] = itmLock + } + itmLock.cnt++ + l.lkMux.Unlock() + itmLock.lk.Lock() +} + +func (l *multiLock) RLock(itmID interface{}) { + l.lkMux.Lock() + itmLock, exists := l.locks[itmID] + if !exists { + itmLock = &itemLock{&sync.RWMutex{}, 0} + l.locks[itmID] = itmLock + } + itmLock.cnt++ + l.lkMux.Unlock() + itmLock.lk.RLock() +} + +func (l *multiLock) Unlock(itmID interface{}) { + l.lkMux.Lock() + itmLock, exists := l.locks[itmID] + if !exists { + panic("sync Unlock of non existent lock!!") + } + itmLock.lk.Unlock() + itmLock.cnt-- + if itmLock.cnt == 0 { + delete(l.locks, itmID) + } + if itmLock.cnt < 0 { + panic("sync Unlock of free Lock!!") + } + l.lkMux.Unlock() +} + +func (l *multiLock) RUnlock(itmID interface{}) { + l.lkMux.Lock() + itmLock, exists := l.locks[itmID] + if !exists { + panic("sync Unlock of non existent lock!!") + } + itmLock.lk.RUnlock() + itmLock.cnt-- + if itmLock.cnt == 0 { + delete(l.locks, itmID) + } + if itmLock.cnt < 0 { + panic("sync Unlock of free Lock!!") + } + l.lkMux.Unlock() +}