seaweedfs/weed/server/filer_grpc_server_sub_meta.go
2021-08-31 23:23:08 -07:00

252 lines
7.4 KiB
Go

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