mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-13 17:56:44 +08:00
337 lines
11 KiB
Go
337 lines
11 KiB
Go
package weed_server
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import (
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/stats"
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"strings"
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"sync/atomic"
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"time"
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"google.golang.org/protobuf/proto"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/util"
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"github.com/seaweedfs/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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isReplacing, alreadyKnown, clientName := fs.addClient("", req.ClientName, peerAddress, req.ClientId, req.ClientEpoch)
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if isReplacing {
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fs.filer.MetaAggregator.ListenersCond.Broadcast() // nudges the subscribers that are waiting
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} else if alreadyKnown {
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return fmt.Errorf("duplicated subscription detected for client %s id %d", clientName, req.ClientId)
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}
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defer fs.deleteClient("", clientName, req.ClientId, req.ClientEpoch)
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lastReadTime := log_buffer.NewMessagePosition(req.SinceNs, -2)
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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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var isDone bool
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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, isDone, readPersistedLogErr = fs.filer.ReadPersistedLogBuffer(lastReadTime, req.UntilNs, 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 isDone {
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return nil
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}
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if processedTsNs != 0 {
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lastReadTime = log_buffer.NewMessagePosition(processedTsNs, -2)
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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, isDone, readInMemoryLogErr = fs.filer.MetaAggregator.MetaLogBuffer.LoopProcessLogData("aggMeta:"+clientName, lastReadTime, req.UntilNs, 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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if !fs.hasClient(req.ClientId, req.ClientEpoch) {
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return false
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}
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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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if readInMemoryLogErr != log_buffer.ResumeError {
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break
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}
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}
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if isDone {
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return nil
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}
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if !fs.hasClient(req.ClientId, req.ClientEpoch) {
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glog.V(0).Infof("client %v is closed", clientName)
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return nil
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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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// use negative client id to differentiate from addClient()/deleteClient() used in SubscribeMetadata()
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req.ClientId = -req.ClientId
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isReplacing, alreadyKnown, clientName := fs.addClient("local", req.ClientName, peerAddress, req.ClientId, req.ClientEpoch)
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if isReplacing {
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fs.listenersCond.Broadcast() // nudges the subscribers that are waiting
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} else if alreadyKnown {
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return fmt.Errorf("duplicated local subscription detected for client %s clientId:%d", clientName, req.ClientId)
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}
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defer func() {
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glog.V(0).Infof("disconnect %v local subscriber %s clientId:%d", clientName, req.PathPrefix, req.ClientId)
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fs.deleteClient("local", clientName, req.ClientId, req.ClientEpoch)
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}()
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lastReadTime := log_buffer.NewMessagePosition(req.SinceNs, -2)
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glog.V(0).Infof(" + %v local subscribe %s from %+v clientId:%d", clientName, req.PathPrefix, lastReadTime, req.ClientId)
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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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var isDone bool
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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, isDone, readPersistedLogErr = fs.filer.ReadPersistedLogBuffer(lastReadTime, req.UntilNs, 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 isDone {
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return nil
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}
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if processedTsNs != 0 {
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lastReadTime = log_buffer.NewMessagePosition(processedTsNs, -2)
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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, isDone, readInMemoryLogErr = fs.filer.LocalMetaLogBuffer.LoopProcessLogData("localMeta:"+clientName, lastReadTime, req.UntilNs, func() bool {
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fs.listenersLock.Lock()
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atomic.AddInt64(&fs.listenersWaits, 1)
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fs.listenersCond.Wait()
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atomic.AddInt64(&fs.listenersWaits, -1)
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fs.listenersLock.Unlock()
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if !fs.hasClient(req.ClientId, req.ClientEpoch) {
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return false
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}
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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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if readInMemoryLogErr != log_buffer.ResumeError {
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break
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}
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}
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if isDone {
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return nil
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}
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if !fs.hasClient(req.ClientId, req.ClientEpoch) {
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return nil
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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) log_buffer.EachLogEntryFuncType {
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return func(logEntry *filer_pb.LogEntry) (bool, 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 false, 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 false, err
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}
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return false, 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 if matchByDirectory(dirPath, req.Directories) {
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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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// collect timestamps for path
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stats.FilerServerLastSendTsOfSubscribeGauge.WithLabelValues(fs.option.Host.String(), req.ClientName, req.PathPrefix).Set(float64(tsNs))
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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 matchByDirectory(dirPath string, directories []string) bool {
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for _, dir := range directories {
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if dirPath == dir {
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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(prefix string, clientType string, clientAddress string, clientId int32, clientEpoch int32) (isReplacing, alreadyKnown bool, clientName string) {
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clientName = clientType + "@" + clientAddress
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glog.V(0).Infof("+ %v listener %v clientId %v clientEpoch %v", prefix, clientName, clientId, clientEpoch)
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if clientId != 0 {
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fs.knownListenersLock.Lock()
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defer fs.knownListenersLock.Unlock()
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epoch, found := fs.knownListeners[clientId]
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if !found || epoch < clientEpoch {
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fs.knownListeners[clientId] = clientEpoch
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isReplacing = true
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} else {
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alreadyKnown = true
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}
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}
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return
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}
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func (fs *FilerServer) deleteClient(prefix string, clientName string, clientId int32, clientEpoch int32) {
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glog.V(0).Infof("- %v listener %v clientId %v clientEpoch %v", prefix, clientName, clientId, clientEpoch)
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if clientId != 0 {
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fs.knownListenersLock.Lock()
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defer fs.knownListenersLock.Unlock()
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epoch, found := fs.knownListeners[clientId]
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if found && epoch <= clientEpoch {
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delete(fs.knownListeners, clientId)
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}
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}
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}
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func (fs *FilerServer) hasClient(clientId int32, clientEpoch int32) bool {
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if clientId != 0 {
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fs.knownListenersLock.Lock()
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defer fs.knownListenersLock.Unlock()
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epoch, found := fs.knownListeners[clientId]
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if found && epoch <= clientEpoch {
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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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