package command import ( "context" "errors" "fmt" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/replication" "github.com/chrislusf/seaweedfs/weed/replication/sink/filersink" "github.com/chrislusf/seaweedfs/weed/replication/source" "github.com/chrislusf/seaweedfs/weed/security" "github.com/chrislusf/seaweedfs/weed/util" "github.com/chrislusf/seaweedfs/weed/util/grace" "google.golang.org/grpc" "io" "strings" "time" ) type SyncOptions struct { isActivePassive *bool filerA *string filerB *string aPath *string bPath *string aReplication *string bReplication *string aCollection *string bCollection *string aTtlSec *int bTtlSec *int aDebug *bool bDebug *bool } var ( syncOptions SyncOptions syncCpuProfile *string syncMemProfile *string ) func init() { cmdFilerSynchronize.Run = runFilerSynchronize // break init cycle syncOptions.isActivePassive = cmdFilerSynchronize.Flag.Bool("isActivePassive", false, "one directional follow if true") syncOptions.filerA = cmdFilerSynchronize.Flag.String("a", "", "filer A in one SeaweedFS cluster") syncOptions.filerB = cmdFilerSynchronize.Flag.String("b", "", "filer B in the other SeaweedFS cluster") syncOptions.aPath = cmdFilerSynchronize.Flag.String("a.path", "/", "directory to sync on filer A") syncOptions.bPath = cmdFilerSynchronize.Flag.String("b.path", "/", "directory to sync on filer B") syncOptions.aReplication = cmdFilerSynchronize.Flag.String("a.replication", "", "replication on filer A") syncOptions.bReplication = cmdFilerSynchronize.Flag.String("b.replication", "", "replication on filer B") syncOptions.aCollection = cmdFilerSynchronize.Flag.String("a.collection", "", "collection on filer A") syncOptions.bCollection = cmdFilerSynchronize.Flag.String("b.collection", "", "collection on filer B") syncOptions.aTtlSec = cmdFilerSynchronize.Flag.Int("a.ttlSec", 0, "ttl in seconds on filer A") syncOptions.bTtlSec = cmdFilerSynchronize.Flag.Int("b.ttlSec", 0, "ttl in seconds on filer B") syncOptions.aDebug = cmdFilerSynchronize.Flag.Bool("a.debug", false, "debug mode to print out filer A received files") syncOptions.bDebug = cmdFilerSynchronize.Flag.Bool("b.debug", false, "debug mode to print out filer B received files") syncCpuProfile = cmdFilerSynchronize.Flag.String("cpuprofile", "", "cpu profile output file") syncMemProfile = cmdFilerSynchronize.Flag.String("memprofile", "", "memory profile output file") } var cmdFilerSynchronize = &Command{ UsageLine: "filer.sync -a=: -b=:", Short: "continuously synchronize between two active-active or active-passive SeaweedFS clusters", Long: `continuously synchronize file changes between two active-active or active-passive filers filer.sync listens on filer notifications. If any file is updated, it will fetch the updated content, and write to the other destination. Different from filer.replicate: * filer.sync only works between two filers. * filer.sync does not need any special message queue setup. * filer.sync supports both active-active and active-passive modes. If restarted, the synchronization will resume from the previous checkpoints, persisted every minute. `, } func runFilerSynchronize(cmd *Command, args []string) bool { grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client") grace.SetupProfiling(*syncCpuProfile, *syncMemProfile) go func() { for { err := doSubscribeFilerMetaChanges(grpcDialOption, *syncOptions.filerA, *syncOptions.aPath, *syncOptions.filerB, *syncOptions.bPath, *syncOptions.bReplication, *syncOptions.bCollection, *syncOptions.bTtlSec, *syncOptions.bDebug) if err != nil { glog.Errorf("sync from %s to %s: %v", *syncOptions.filerA, *syncOptions.filerB, err) time.Sleep(1747 * time.Millisecond) } } }() if !*syncOptions.isActivePassive { go func() { for { err := doSubscribeFilerMetaChanges(grpcDialOption, *syncOptions.filerB, *syncOptions.bPath, *syncOptions.filerA, *syncOptions.aPath, *syncOptions.aReplication, *syncOptions.aCollection, *syncOptions.aTtlSec, *syncOptions.aDebug) if err != nil { glog.Errorf("sync from %s to %s: %v", *syncOptions.filerB, *syncOptions.filerA, err) time.Sleep(2147 * time.Millisecond) } } }() } select {} return true } func doSubscribeFilerMetaChanges(grpcDialOption grpc.DialOption, sourceFiler, sourcePath, targetFiler, targetPath string, replicationStr, collection string, ttlSec int, debug bool) error { // read source filer signature sourceFilerSignature, sourceErr := replication.ReadFilerSignature(grpcDialOption, sourceFiler) if sourceErr != nil { return sourceErr } // read target filer signature targetFilerSignature, targetErr := replication.ReadFilerSignature(grpcDialOption, targetFiler) if targetErr != nil { return targetErr } // if first time, start from now // if has previously synced, resume from that point of time sourceFilerOffsetTsNs, err := readSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature) if err != nil { return err } glog.V(0).Infof("start sync %s(%d) => %s(%d) from %v(%d)", sourceFiler, sourceFilerSignature, targetFiler, targetFilerSignature, time.Unix(0, sourceFilerOffsetTsNs), sourceFilerOffsetTsNs) // create filer sink filerSource := &source.FilerSource{} filerSource.DoInitialize(pb.ServerToGrpcAddress(sourceFiler), sourcePath) filerSink := &filersink.FilerSink{} filerSink.DoInitialize(pb.ServerToGrpcAddress(targetFiler), targetPath, replicationStr, collection, ttlSec, grpcDialOption) filerSink.SetSourceFiler(filerSource) processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error { message := resp.EventNotification var sourceOldKey, sourceNewKey util.FullPath if message.OldEntry != nil { sourceOldKey = util.FullPath(resp.Directory).Child(message.OldEntry.Name) } if message.NewEntry != nil { sourceNewKey = util.FullPath(message.NewParentPath).Child(message.NewEntry.Name) } for _, sig := range message.Signatures { if sig == targetFilerSignature && targetFilerSignature != 0 { fmt.Printf("%s skipping %s change to %v\n", targetFiler, sourceFiler, message) return nil } } if debug { fmt.Printf("%s check %s change %s,%s sig %v, target sig: %v\n", targetFiler, sourceFiler, sourceOldKey, sourceNewKey, message.Signatures, targetFilerSignature) } if !strings.HasPrefix(resp.Directory, sourcePath) { return nil } // handle deletions if message.OldEntry != nil && message.NewEntry == nil { if !strings.HasPrefix(string(sourceOldKey), sourcePath) { return nil } key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):]) return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures) } // handle new entries if message.OldEntry == nil && message.NewEntry != nil { if !strings.HasPrefix(string(sourceNewKey), sourcePath) { return nil } key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):]) return filerSink.CreateEntry(key, message.NewEntry, message.Signatures) } // this is something special? if message.OldEntry == nil && message.NewEntry == nil { return nil } // handle updates if strings.HasPrefix(string(sourceOldKey), sourcePath) { // old key is in the watched directory if strings.HasPrefix(string(sourceNewKey), sourcePath) { // new key is also in the watched directory oldKey := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):]) message.NewParentPath = util.Join(targetPath, message.NewParentPath[len(sourcePath):]) foundExisting, err := filerSink.UpdateEntry(string(oldKey), message.OldEntry, message.NewParentPath, message.NewEntry, message.DeleteChunks, message.Signatures) if foundExisting { return err } // not able to find old entry if err = filerSink.DeleteEntry(string(oldKey), message.OldEntry.IsDirectory, false, message.Signatures); err != nil { return fmt.Errorf("delete old entry %v: %v", oldKey, err) } // create the new entry newKey := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):]) return filerSink.CreateEntry(newKey, message.NewEntry, message.Signatures) } else { // new key is outside of the watched directory key := util.Join(targetPath, string(sourceOldKey)[len(sourcePath):]) return filerSink.DeleteEntry(key, message.OldEntry.IsDirectory, message.DeleteChunks, message.Signatures) } } else { // old key is outside of the watched directory if strings.HasPrefix(string(sourceNewKey), sourcePath) { // new key is in the watched directory key := util.Join(targetPath, string(sourceNewKey)[len(sourcePath):]) return filerSink.CreateEntry(key, message.NewEntry, message.Signatures) } else { // new key is also outside of the watched directory // skip } } return nil } return pb.WithFilerClient(sourceFiler, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { ctx, cancel := context.WithCancel(context.Background()) defer cancel() stream, err := client.SubscribeMetadata(ctx, &filer_pb.SubscribeMetadataRequest{ ClientName: "syncTo_" + targetFiler, PathPrefix: sourcePath, SinceNs: sourceFilerOffsetTsNs, Signature: targetFilerSignature, }) if err != nil { return fmt.Errorf("listen: %v", err) } var counter int64 var lastWriteTime time.Time for { resp, listenErr := stream.Recv() if listenErr == io.EOF { return nil } if listenErr != nil { return listenErr } if err := processEventFn(resp); err != nil { return err } counter++ if lastWriteTime.Add(3 * time.Second).Before(time.Now()) { glog.V(0).Infof("sync %s => %s progressed to %v %0.2f/sec", sourceFiler, targetFiler, time.Unix(0, resp.TsNs), float64(counter)/float64(3)) counter = 0 lastWriteTime = time.Now() if err := writeSyncOffset(grpcDialOption, targetFiler, sourceFilerSignature, resp.TsNs); err != nil { return err } } } }) } const ( SyncKeyPrefix = "sync." ) func readSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32) (lastOffsetTsNs int64, readErr error) { readErr = pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { syncKey := []byte(SyncKeyPrefix + "____") util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature)) resp, err := client.KvGet(context.Background(), &filer_pb.KvGetRequest{Key: syncKey}) if err != nil { return err } if len(resp.Error) != 0 { return errors.New(resp.Error) } if len(resp.Value) < 8 { return nil } lastOffsetTsNs = int64(util.BytesToUint64(resp.Value)) return nil }) return } func writeSyncOffset(grpcDialOption grpc.DialOption, filer string, filerSignature int32, offsetTsNs int64) error { return pb.WithFilerClient(filer, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { syncKey := []byte(SyncKeyPrefix + "____") util.Uint32toBytes(syncKey[len(SyncKeyPrefix):len(SyncKeyPrefix)+4], uint32(filerSignature)) valueBuf := make([]byte, 8) util.Uint64toBytes(valueBuf, uint64(offsetTsNs)) resp, err := client.KvPut(context.Background(), &filer_pb.KvPutRequest{ Key: syncKey, Value: valueBuf, }) if err != nil { return err } if len(resp.Error) != 0 { return errors.New(resp.Error) } return nil }) }