From e24b25de784daf42a15daf573249d608ebc2b44a Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Tue, 21 Apr 2020 21:16:13 -0700
Subject: [PATCH] async meta caching: can stream updates now

---
 other/java/client/src/main/proto/filer.proto  |   1 +
 weed/filer2/entry.go                          |   8 +
 weed/filer2/filer_notify.go                   |   1 +
 weed/filesys/meta_cache/meta_cache.go         |   6 +-
 weed/filesys/meta_cache/meta_cache_init.go    |  10 +
 .../meta_cache/meta_cache_subscribe.go        |  71 +++++
 weed/filesys/wfs.go                           |   8 +
 weed/pb/filer.proto                           |   1 +
 weed/pb/filer_pb/filer.pb.go                  | 252 +++++++++---------
 weed/server/filer_grpc_server_listen.go       |   5 +-
 10 files changed, 236 insertions(+), 127 deletions(-)
 create mode 100644 weed/filesys/meta_cache/meta_cache_init.go
 create mode 100644 weed/filesys/meta_cache/meta_cache_subscribe.go

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index bc159fd14..6d890861d 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -253,6 +253,7 @@ message SubscribeMetadataRequest {
 message SubscribeMetadataResponse {
     string directory = 1;
     EventNotification event_notification = 2;
+    int64 ts_ns = 3;
 }
 
 message LogEntry {
diff --git a/weed/filer2/entry.go b/weed/filer2/entry.go
index 6dff99af9..00b9b132d 100644
--- a/weed/filer2/entry.go
+++ b/weed/filer2/entry.go
@@ -73,3 +73,11 @@ func (entry *Entry) ToProtoFullEntry() *filer_pb.FullEntry {
 		Entry: entry.ToProtoEntry(),
 	}
 }
+
+func FromPbEntry(dir string, entry *filer_pb.Entry) *Entry {
+	return &Entry{
+		FullPath: util.NewFullPath(dir, entry.Name),
+		Attr:     PbToEntryAttribute(entry.Attributes),
+		Chunks:   entry.Chunks,
+	}
+}
diff --git a/weed/filer2/filer_notify.go b/weed/filer2/filer_notify.go
index e5356472a..a55e1724b 100644
--- a/weed/filer2/filer_notify.go
+++ b/weed/filer2/filer_notify.go
@@ -56,6 +56,7 @@ func (f *Filer) logMetaEvent(fullpath string, eventNotification *filer_pb.EventN
 	event := &filer_pb.SubscribeMetadataResponse{
 		Directory:         dir,
 		EventNotification: eventNotification,
+		TsNs:              time.Now().UnixNano(),
 	}
 	data, err := proto.Marshal(event)
 	if err != nil {
diff --git a/weed/filesys/meta_cache/meta_cache.go b/weed/filesys/meta_cache/meta_cache.go
index 4f047e824..0aea69050 100644
--- a/weed/filesys/meta_cache/meta_cache.go
+++ b/weed/filesys/meta_cache/meta_cache.go
@@ -14,11 +14,11 @@ type MetaCache struct {
 
 func NewMetaCache(dbFolder string) *MetaCache {
 	return &MetaCache{
-		FilerStore: OpenMetaStore(dbFolder),
+		FilerStore: openMetaStore(dbFolder),
 	}
 }
 
-func OpenMetaStore(dbFolder string) filer2.FilerStore {
+func openMetaStore(dbFolder string) filer2.FilerStore {
 
 	os.MkdirAll(dbFolder, 0755)
 
@@ -31,4 +31,4 @@ func OpenMetaStore(dbFolder string) filer2.FilerStore {
 
 	return store
 
-}
+}
\ No newline at end of file
diff --git a/weed/filesys/meta_cache/meta_cache_init.go b/weed/filesys/meta_cache/meta_cache_init.go
new file mode 100644
index 000000000..8591f190a
--- /dev/null
+++ b/weed/filesys/meta_cache/meta_cache_init.go
@@ -0,0 +1,10 @@
+package meta_cache
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func InitMetaCache(mc *MetaCache, client filer_pb.FilerClient) error {
+
+	return nil
+}
diff --git a/weed/filesys/meta_cache/meta_cache_subscribe.go b/weed/filesys/meta_cache/meta_cache_subscribe.go
new file mode 100644
index 000000000..da3085fcb
--- /dev/null
+++ b/weed/filesys/meta_cache/meta_cache_subscribe.go
@@ -0,0 +1,71 @@
+package meta_cache
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func SubscribeMetaEvents(mc *MetaCache, client filer_pb.FilerClient, dir string) error {
+
+	processEventFn := func(resp *filer_pb.SubscribeMetadataResponse) error {
+		message := resp.EventNotification
+		ctx := context.Background()
+		var err error
+		if message.OldEntry != nil {
+			key := util.NewFullPath(resp.Directory, message.OldEntry.Name)
+			glog.V(4).Infof("deleting %v", key)
+			err = mc.DeleteEntry(ctx, key)
+		}
+
+		if message.NewEntry != nil {
+			dir := resp.Directory
+			if message.NewParentPath != "" {
+				dir = message.NewParentPath
+			}
+			key := util.NewFullPath(dir, message.NewEntry.Name)
+			glog.V(4).Infof("creating %v", key)
+			err = mc.InsertEntry(ctx, filer2.FromPbEntry(dir, message.NewEntry))
+		}
+		return err
+	}
+
+	var lastTsNs int64
+	for {
+		err := client.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+			stream, err := client.SubscribeMetadata(context.Background(), &filer_pb.SubscribeMetadataRequest{
+				ClientName: "mount",
+				PathPrefix: dir,
+				SinceNs:    lastTsNs,
+			})
+			if err != nil {
+				return fmt.Errorf("subscribe: %v", err)
+			}
+
+			for {
+				resp, listenErr := stream.Recv()
+				if listenErr == io.EOF {
+					return nil
+				}
+				if listenErr != nil {
+					return listenErr
+				}
+
+				if err := processEventFn(resp); err != nil {
+					return fmt.Errorf("process %v: %v", resp, err)
+				}
+				lastTsNs = resp.TsNs
+			}
+		})
+		if err != nil {
+			glog.V(0).Infof("subscribing filer meta change: %v", err)
+			time.Sleep(time.Second)
+		}
+	}
+}
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index b27ac440d..e67e77613 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -95,6 +95,14 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 	}
 	if wfs.option.AsyncMetaDataCaching {
 		wfs.metaCache = meta_cache.NewMetaCache(path.Join(option.CacheDir, "meta"))
+		if err := meta_cache.InitMetaCache(wfs.metaCache, wfs); err != nil{
+			glog.V(0).Infof("failed to init meta cache: %v", err)
+		} else {
+			go meta_cache.SubscribeMetaEvents(wfs.metaCache, wfs, wfs.option.FilerMountRootPath)
+			util.OnInterrupt(func() {
+				wfs.metaCache.Shutdown()
+			})
+		}
 	}
 
 	wfs.root = &Dir{name: wfs.option.FilerMountRootPath, wfs: wfs}
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index bc159fd14..6d890861d 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -253,6 +253,7 @@ message SubscribeMetadataRequest {
 message SubscribeMetadataResponse {
     string directory = 1;
     EventNotification event_notification = 2;
+    int64 ts_ns = 3;
 }
 
 message LogEntry {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 2f254d22f..83f0eae0d 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1167,6 +1167,7 @@ func (m *SubscribeMetadataRequest) GetSinceNs() int64 {
 type SubscribeMetadataResponse struct {
 	Directory         string             `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
 	EventNotification *EventNotification `protobuf:"bytes,2,opt,name=event_notification,json=eventNotification" json:"event_notification,omitempty"`
+	TsNs              int64              `protobuf:"varint,3,opt,name=ts_ns,json=tsNs" json:"ts_ns,omitempty"`
 }
 
 func (m *SubscribeMetadataResponse) Reset()                    { *m = SubscribeMetadataResponse{} }
@@ -1188,6 +1189,13 @@ func (m *SubscribeMetadataResponse) GetEventNotification() *EventNotification {
 	return nil
 }
 
+func (m *SubscribeMetadataResponse) GetTsNs() int64 {
+	if m != nil {
+		return m.TsNs
+	}
+	return 0
+}
+
 type LogEntry struct {
 	TsNs             int64  `protobuf:"varint,1,opt,name=ts_ns,json=tsNs" json:"ts_ns,omitempty"`
 	PartitionKeyHash int32  `protobuf:"varint,2,opt,name=partition_key_hash,json=partitionKeyHash" json:"partition_key_hash,omitempty"`
@@ -1784,128 +1792,128 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1956 bytes of a gzipped FileDescriptorProto
+	// 1957 bytes of a gzipped FileDescriptorProto
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+	0x81, 0x15, 0xa1, 0xe1, 0xe7, 0x54, 0xec, 0x69, 0x4c, 0x7f, 0x0e, 0x68, 0xd3, 0x5b, 0x9e, 0xc8,
+	0xe4, 0xa4, 0x8d, 0x7f, 0x7c, 0x7f, 0xf2, 0xbf, 0x00, 0x00, 0x00, 0xff, 0xff, 0x39, 0x78, 0xfe,
+	0x97, 0x00, 0x16, 0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server_listen.go b/weed/server/filer_grpc_server_listen.go
index 6dd423007..1da257202 100644
--- a/weed/server/filer_grpc_server_listen.go
+++ b/weed/server/filer_grpc_server_listen.go
@@ -26,7 +26,7 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 		lastReadTime = time.Unix(0, req.SinceNs)
 	}
 
-	eachEventNotificationFn := func(dirPath string, eventNotification *filer_pb.EventNotification) error {
+	eachEventNotificationFn := func(dirPath string, eventNotification *filer_pb.EventNotification, tsNs int64) error {
 
 		// get complete path to the file or directory
 		var entryName string
@@ -50,6 +50,7 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 		message := &filer_pb.SubscribeMetadataResponse{
 			Directory:         dirPath,
 			EventNotification: eventNotification,
+			TsNs:              tsNs,
 		}
 		if err := stream.Send(message); err != nil {
 			glog.V(0).Infof("=> client %v: %+v", clientName, err)
@@ -70,7 +71,7 @@ func (fs *FilerServer) SubscribeMetadata(req *filer_pb.SubscribeMetadataRequest,
 			return fmt.Errorf("unexpected unmarshal filer_pb.SubscribeMetadataResponse: %v", err)
 		}
 
-		if err := eachEventNotificationFn(event.Directory, event.EventNotification); err != nil {
+		if err := eachEventNotificationFn(event.Directory, event.EventNotification, event.TsNs); err != nil {
 			return err
 		}