mirror of
https://github.com/seaweedfs/seaweedfs.git
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249 lines
7.5 KiB
Go
249 lines
7.5 KiB
Go
package weed_server
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import (
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"fmt"
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"strings"
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"time"
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"github.com/golang/protobuf/proto"
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"github.com/chrislusf/seaweedfs/weed/filer"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/chrislusf/seaweedfs/weed/util/log_buffer"
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)
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const (
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// MaxUnsyncedEvents send empty notification with timestamp when certain amount of events have been filtered
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MaxUnsyncedEvents = 1e3
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)
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func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest, stream filer_pb.SeaweedFiler_SubscribeMetadataServer) error {
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peerAddress := findClientAddress(stream.Context(), 0)
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clientName := fs.addClient(req.ClientName, peerAddress)
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defer fs.deleteClient(clientName)
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lastReadTime := time.Unix(0, req.SinceNs)
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glog.V(0).Infof(" %v starts to subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
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eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName)
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eachLogEntryFn := eachLogEntryFn(eachEventNotificationFn)
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var processedTsNs int64
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var readPersistedLogErr error
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var readInMemoryLogErr error
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for {
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glog.V(4).Infof("read on disk %v aggregated subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
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processedTsNs, readPersistedLogErr = fs.filer.ReadPersistedLogBuffer(lastReadTime, eachLogEntryFn)
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if readPersistedLogErr != nil {
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return fmt.Errorf("reading from persisted logs: %v", readPersistedLogErr)
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}
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if processedTsNs != 0 {
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lastReadTime = time.Unix(0, processedTsNs)
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}
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glog.V(4).Infof("read in memory %v aggregated subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
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lastReadTime, readInMemoryLogErr = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData("aggMeta:"+clientName, lastReadTime, func() bool {
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fs.filer.MetaAggregator.ListenersLock.Lock()
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fs.filer.MetaAggregator.ListenersCond.Wait()
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fs.filer.MetaAggregator.ListenersLock.Unlock()
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return true
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}, eachLogEntryFn)
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if readInMemoryLogErr != nil {
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if readInMemoryLogErr == log_buffer.ResumeFromDiskError {
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time.Sleep(1127 * time.Millisecond)
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continue
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}
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glog.Errorf("processed to %v: %v", lastReadTime, readInMemoryLogErr)
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if readInMemoryLogErr != log_buffer.ResumeError {
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break
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}
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}
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time.Sleep(1127 * time.Millisecond)
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}
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return readInMemoryLogErr
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}
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func (fs *FilerServer) SubscribeLocalMetadata(req *filer_pb.SubscribeMetadataRequest, stream filer_pb.SeaweedFiler_SubscribeLocalMetadataServer) error {
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peerAddress := findClientAddress(stream.Context(), 0)
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clientName := fs.addClient(req.ClientName, peerAddress)
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defer fs.deleteClient(clientName)
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lastReadTime := time.Unix(0, req.SinceNs)
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glog.V(0).Infof(" %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
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eachEventNotificationFn := fs.eachEventNotificationFn(req, stream, clientName)
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eachLogEntryFn := eachLogEntryFn(eachEventNotificationFn)
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var processedTsNs int64
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var readPersistedLogErr error
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var readInMemoryLogErr error
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for {
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// println("reading from persisted logs ...")
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glog.V(0).Infof("read on disk %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
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processedTsNs, readPersistedLogErr = fs.filer.ReadPersistedLogBuffer(lastReadTime, eachLogEntryFn)
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if readPersistedLogErr != nil {
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glog.V(0).Infof("read on disk %v local subscribe %s from %+v: %v", clientName, req.PathPrefix, lastReadTime, readPersistedLogErr)
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return fmt.Errorf("reading from persisted logs: %v", readPersistedLogErr)
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}
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if processedTsNs != 0 {
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lastReadTime = time.Unix(0, processedTsNs)
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} else {
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if readInMemoryLogErr == log_buffer.ResumeFromDiskError {
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time.Sleep(1127 * time.Millisecond)
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continue
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}
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}
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glog.V(0).Infof("read in memory %v local subscribe %s from %+v", clientName, req.PathPrefix, lastReadTime)
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lastReadTime, readInMemoryLogErr = fs.filer.LocalMetaLogBuffer.LoopProcessLogData("localMeta:"+clientName, lastReadTime, func() bool {
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fs.listenersLock.Lock()
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fs.listenersCond.Wait()
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fs.listenersLock.Unlock()
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return true
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}, eachLogEntryFn)
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if readInMemoryLogErr != nil {
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if readInMemoryLogErr == log_buffer.ResumeFromDiskError {
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continue
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}
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glog.Errorf("processed to %v: %v", lastReadTime, readInMemoryLogErr)
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time.Sleep(1127 * time.Millisecond)
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if readInMemoryLogErr != log_buffer.ResumeError {
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break
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}
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}
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}
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return readInMemoryLogErr
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}
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func eachLogEntryFn(eachEventNotificationFn func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error) func(logEntry *filer_pb.LogEntry) error {
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return func(logEntry *filer_pb.LogEntry) error {
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event := &filer_pb.SubscribeMetadataResponse{}
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if err := proto.Unmarshal(logEntry.Data, event); err != nil {
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glog.Errorf("unexpected unmarshal filer_pb.SubscribeMetadataResponse: %v", err)
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return fmt.Errorf("unexpected unmarshal filer_pb.SubscribeMetadataResponse: %v", err)
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}
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if err := eachEventNotificationFn(event.Directory, event.EventNotification, event.TsNs); err != nil {
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return err
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}
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return nil
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}
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}
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func (fs *FilerServer) eachEventNotificationFn(req *filer_pb.SubscribeMetadataRequest, stream filer_pb.SeaweedFiler_SubscribeMetadataServer, clientName string) func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error {
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filtered := 0
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return func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error {
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defer func() {
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if filtered > MaxUnsyncedEvents {
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if err := stream.Send(&filer_pb.SubscribeMetadataResponse{
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EventNotification: &filer_pb.EventNotification{},
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TsNs: tsNs,
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}); err == nil {
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filtered = 0
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}
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}
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}()
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filtered++
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foundSelf := false
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for _, sig := range eventNotification.Signatures {
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if sig == req.Signature && req.Signature != 0 {
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return nil
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}
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if sig == fs.filer.Signature {
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foundSelf = true
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}
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}
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if !foundSelf {
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eventNotification.Signatures = append(eventNotification.Signatures, fs.filer.Signature)
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}
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// get complete path to the file or directory
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var entryName string
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if eventNotification.OldEntry != nil {
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entryName = eventNotification.OldEntry.Name
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} else if eventNotification.NewEntry != nil {
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entryName = eventNotification.NewEntry.Name
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}
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fullpath := util.Join(dirPath, entryName)
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// skip on filer internal meta logs
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if strings.HasPrefix(fullpath, filer.SystemLogDir) {
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return nil
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}
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if hasPrefixIn(fullpath, req.PathPrefixes) {
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// good
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} else {
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if !strings.HasPrefix(fullpath, req.PathPrefix) {
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if eventNotification.NewParentPath != "" {
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newFullPath := util.Join(eventNotification.NewParentPath, entryName)
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if !strings.HasPrefix(newFullPath, req.PathPrefix) {
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return nil
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}
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} else {
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return nil
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}
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}
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}
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message := &filer_pb.SubscribeMetadataResponse{
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Directory: dirPath,
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EventNotification: eventNotification,
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TsNs: tsNs,
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}
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// println("sending", dirPath, entryName)
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if err := stream.Send(message); err != nil {
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glog.V(0).Infof("=> client %v: %+v", clientName, err)
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return err
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}
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filtered = 0
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return nil
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}
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}
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func hasPrefixIn(text string, prefixes []string) bool {
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for _, p := range prefixes {
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if strings.HasPrefix(text, p) {
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return true
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}
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}
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return false
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}
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func (fs *FilerServer) addClient(clientType string, clientAddress string) (clientName string) {
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clientName = clientType + "@" + clientAddress
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glog.V(0).Infof("+ listener %v", clientName)
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return
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}
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func (fs *FilerServer) deleteClient(clientName string) {
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glog.V(0).Infof("- listener %v", clientName)
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}
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