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Merge pull request #5795 from xiang90/filter

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*: support watch with filters
This commit is contained in:
Xiang Li 2016-06-28 14:07:12 -07:00 committed by GitHub
commit bc6d7659af
8 changed files with 459 additions and 215 deletions
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16
Documentation/dev-guide/apispec/swagger/rpc.swagger.json
View File

@ -181,6 +181,15 @@
],
"default": "KEY"
},
"WatchCreateRequestFilterType": {
"type": "string",
"enum": [
"NOPUT",
"NODELETE"
],
"default": "NOPUT",
"description": "- NOPUT: filter out put event.\n - NODELETE: filter out delete event."
},
"authpbPermission": {
"type": "object",
"properties": {
@ -1171,6 +1180,13 @@
"etcdserverpbWatchCreateRequest": {
"type": "object",
"properties": {
"filters": {
"type": "array",
"items": {
"$ref": "#/definitions/WatchCreateRequestFilterType"
},
"description": "filters filter the events at server side before it sends back to the watcher."
},
"key": {
"type": "string",
"format": "byte",

21
etcdserver/api/v3rpc/watch.go
View File

@ -164,12 +164,23 @@ func (sws *serverWatchStream) recvLoop() error {
// support >= key queries
creq.RangeEnd = []byte{}
}
filters := make([]mvcc.FilterFunc, 0, len(creq.Filters))
for _, ft := range creq.Filters {
switch ft {
case pb.WatchCreateRequest_NOPUT:
filters = append(filters, filterNoPut)
case pb.WatchCreateRequest_NODELETE:
filters = append(filters, filterNoDelete)
default:
}
}
wsrev := sws.watchStream.Rev()
rev := creq.StartRevision
if rev == 0 {
rev = wsrev + 1
}
id := sws.watchStream.Watch(creq.Key, creq.RangeEnd, rev)
id := sws.watchStream.Watch(creq.Key, creq.RangeEnd, rev, filters...)
if id != -1 && creq.ProgressNotify {
sws.progress[id] = true
}
@ -322,3 +333,11 @@ func (sws *serverWatchStream) newResponseHeader(rev int64) *pb.ResponseHeader {
RaftTerm: sws.raftTimer.Term(),
}
}
func filterNoDelete(e mvccpb.Event) bool {
return e.Type == mvccpb.DELETE
}
func filterNoPut(e mvccpb.Event) bool {
return e.Type == mvccpb.PUT
}

451
etcdserver/etcdserverpb/rpc.pb.go
View File

@ -154,6 +154,31 @@ func (x Compare_CompareTarget) String() string {
}
func (Compare_CompareTarget) EnumDescriptor() ([]byte, []int) { return fileDescriptorRpc, []int{9, 1} }
type WatchCreateRequest_FilterType int32
const (
// filter out put event.
WatchCreateRequest_NOPUT WatchCreateRequest_FilterType = 0
// filter out delete event.
WatchCreateRequest_NODELETE WatchCreateRequest_FilterType = 1
)
var WatchCreateRequest_FilterType_name = map[int32]string{
0: "NOPUT",
1: "NODELETE",
}
var WatchCreateRequest_FilterType_value = map[string]int32{
"NOPUT": 0,
"NODELETE": 1,
}
func (x WatchCreateRequest_FilterType) String() string {
return proto.EnumName(WatchCreateRequest_FilterType_name, int32(x))
}
func (WatchCreateRequest_FilterType) EnumDescriptor() ([]byte, []int) {
return fileDescriptorRpc, []int{19, 0}
}
type AlarmRequest_AlarmAction int32
const (
@ -1119,6 +1144,8 @@ type WatchCreateRequest struct {
// wish to recover a disconnected watcher starting from a recent known revision.
// The etcd server may decide how often it will send notifications based on current load.
ProgressNotify bool `protobuf:"varint,4,opt,name=progress_notify,json=progressNotify,proto3" json:"progress_notify,omitempty"`
// filters filter the events at server side before it sends back to the watcher.
Filters []WatchCreateRequest_FilterType `protobuf:"varint,5,rep,name=filters,enum=etcdserverpb.WatchCreateRequest_FilterType" json:"filters,omitempty"`
}
func (m *WatchCreateRequest) Reset() { *m = WatchCreateRequest{} }
@ -2044,6 +2071,7 @@ func init() {
proto.RegisterEnum("etcdserverpb.RangeRequest_SortTarget", RangeRequest_SortTarget_name, RangeRequest_SortTarget_value)
proto.RegisterEnum("etcdserverpb.Compare_CompareResult", Compare_CompareResult_name, Compare_CompareResult_value)
proto.RegisterEnum("etcdserverpb.Compare_CompareTarget", Compare_CompareTarget_name, Compare_CompareTarget_value)
proto.RegisterEnum("etcdserverpb.WatchCreateRequest_FilterType", WatchCreateRequest_FilterType_name, WatchCreateRequest_FilterType_value)
proto.RegisterEnum("etcdserverpb.AlarmRequest_AlarmAction", AlarmRequest_AlarmAction_name, AlarmRequest_AlarmAction_value)
}
@ -4433,6 +4461,13 @@ func (m *WatchCreateRequest) MarshalTo(data []byte) (int, error) {
}
i++
}
if len(m.Filters) > 0 {
for _, num := range m.Filters {
data[i] = 0x28
i++
i = encodeVarintRpc(data, i, uint64(num))
}
}
return i, nil
}
@ -6585,6 +6620,11 @@ func (m *WatchCreateRequest) Size() (n int) {
if m.ProgressNotify {
n += 2
}
if len(m.Filters) > 0 {
for _, e := range m.Filters {
n += 1 + sovRpc(uint64(e))
}
}
return n
}
@ -9770,6 +9810,26 @@ func (m *WatchCreateRequest) Unmarshal(data []byte) error {
}
}
m.ProgressNotify = bool(v != 0)
case 5:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field Filters", wireType)
}
var v WatchCreateRequest_FilterType
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowRpc
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := data[iNdEx]
iNdEx++
v |= (WatchCreateRequest_FilterType(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
m.Filters = append(m.Filters, v)
default:
iNdEx = preIndex
skippy, err := skipRpc(data[iNdEx:])
@ -15125,200 +15185,203 @@ var (
)
var fileDescriptorRpc = []byte{
// 3116 bytes of a gzipped FileDescriptorProto
// 3167 bytes of a gzipped FileDescriptorProto
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}

9
etcdserver/etcdserverpb/rpc.proto
View File

@ -558,6 +558,15 @@ message WatchCreateRequest {
// wish to recover a disconnected watcher starting from a recent known revision.
// The etcd server may decide how often it will send notifications based on current load.
bool progress_notify = 4;
enum FilterType {
// filter out put event.
NOPUT = 0;
// filter out delete event.
NODELETE = 1;
}
// filters filter the events at server side before it sends back to the watcher.
repeated FilterType filters = 5;
}
message WatchCancelRequest {

68
integration/v3_watch_test.go
View File

@ -1011,3 +1011,71 @@ func TestV3WatchClose(t *testing.T) {
clus.Members[0].DropConnections()
wg.Wait()
}
// TestV3WatchWithFilter ensures watcher filters out the events correctly.
func TestV3WatchWithFilter(t *testing.T) {
clus := NewClusterV3(t, &ClusterConfig{Size: 1})
defer clus.Terminate(t)
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
ws, werr := toGRPC(clus.RandClient()).Watch.Watch(ctx)
if werr != nil {
t.Fatal(werr)
}
req := &pb.WatchRequest{RequestUnion: &pb.WatchRequest_CreateRequest{
CreateRequest: &pb.WatchCreateRequest{
Key: []byte("foo"),
Filters: []pb.WatchCreateRequest_FilterType{pb.WatchCreateRequest_NOPUT},
}}}
if err := ws.Send(req); err != nil {
t.Fatal(err)
}
if _, err := ws.Recv(); err != nil {
t.Fatal(err)
}
recv := make(chan *pb.WatchResponse)
go func() {
// check received PUT
resp, rerr := ws.Recv()
if rerr != nil {
t.Fatal(rerr)
}
recv <- resp
}()
// put a key with empty value
kvc := toGRPC(clus.RandClient()).KV
preq := &pb.PutRequest{Key: []byte("foo")}
if _, err := kvc.Put(context.TODO(), preq); err != nil {
t.Fatal(err)
}
select {
case <-recv:
t.Fatal("failed to filter out put event")
case <-time.After(100 * time.Millisecond):
}
dreq := &pb.DeleteRangeRequest{Key: []byte("foo")}
if _, err := kvc.DeleteRange(context.TODO(), dreq); err != nil {
t.Fatal(err)
}
select {
case resp := <-recv:
wevs := []*mvccpb.Event{
{
Type: mvccpb.DELETE,
Kv: &mvccpb.KeyValue{Key: []byte("foo"), ModRevision: 3},
},
}
if !reflect.DeepEqual(resp.Events, wevs) {
t.Fatalf("got %v, expected %v", resp.Events, wevs)
}
case <-time.After(100 * time.Millisecond):
t.Fatal("failed to receive delete event")
}
}

63
mvcc/watchable_store.go
View File

@ -35,7 +35,7 @@ const (
)
type watchable interface {
watch(key, end []byte, startRev int64, id WatchID, ch chan<- WatchResponse) (*watcher, cancelFunc)
watch(key, end []byte, startRev int64, id WatchID, ch chan<- WatchResponse, fcs ...FilterFunc) (*watcher, cancelFunc)
progress(w *watcher)
rev() int64
}
@ -185,7 +185,7 @@ func (s *watchableStore) NewWatchStream() WatchStream {
}
}
func (s *watchableStore) watch(key, end []byte, startRev int64, id WatchID, ch chan<- WatchResponse) (*watcher, cancelFunc) {
func (s *watchableStore) watch(key, end []byte, startRev int64, id WatchID, ch chan<- WatchResponse, fcs ...FilterFunc) (*watcher, cancelFunc) {
s.mu.Lock()
defer s.mu.Unlock()
@ -195,6 +195,7 @@ func (s *watchableStore) watch(key, end []byte, startRev int64, id WatchID, ch c
minRev: startRev,
id: id,
ch: ch,
fcs: fcs,
}
s.store.mu.Lock()
@ -325,10 +326,9 @@ func (s *watchableStore) moveVictims() (moved int) {
for w, eb := range wb {
// watcher has observed the store up to, but not including, w.minRev
rev := w.minRev - 1
select {
case w.ch <- WatchResponse{WatchID: w.id, Events: eb.evs, Revision: rev}:
if w.send(WatchResponse{WatchID: w.id, Events: eb.evs, Revision: rev}) {
pendingEventsGauge.Add(float64(len(eb.evs)))
default:
} else {
if newVictim == nil {
newVictim = make(watcherBatch)
}
@ -419,10 +419,9 @@ func (s *watchableStore) syncWatchers() {
w.minRev = eb.moreRev
}
select {
case w.ch <- WatchResponse{WatchID: w.id, Events: eb.evs, Revision: curRev}:
if w.send(WatchResponse{WatchID: w.id, Events: eb.evs, Revision: curRev}) {
pendingEventsGauge.Add(float64(len(eb.evs)))
default:
} else {
if victims == nil {
victims = make(watcherBatch)
}
@ -480,10 +479,10 @@ func (s *watchableStore) notify(rev int64, evs []mvccpb.Event) {
if eb.revs != 1 {
plog.Panicf("unexpected multiple revisions in notification")
}
select {
case w.ch <- WatchResponse{WatchID: w.id, Events: eb.evs, Revision: rev}:
if w.send(WatchResponse{WatchID: w.id, Events: eb.evs, Revision: rev}) {
pendingEventsGauge.Add(float64(len(eb.evs)))
default:
} else {
// move slow watcher to victims
w.minRev = rev + 1
if victim == nil {
@ -516,12 +515,9 @@ func (s *watchableStore) progress(w *watcher) {
defer s.mu.Unlock()
if _, ok := s.synced.watchers[w]; ok {
select {
case w.ch <- WatchResponse{WatchID: w.id, Revision: s.rev()}:
default:
// If the ch is full, this watcher is receiving events.
// We do not need to send progress at all.
}
w.send(WatchResponse{WatchID: w.id, Revision: s.rev()})
// If the ch is full, this watcher is receiving events.
// We do not need to send progress at all.
}
}
@ -542,7 +538,40 @@ type watcher struct {
minRev int64
id WatchID
fcs []FilterFunc
// a chan to send out the watch response.
// The chan might be shared with other watchers.
ch chan<- WatchResponse
}
func (w *watcher) send(wr WatchResponse) bool {
progressEvent := len(wr.Events) == 0
if len(w.fcs) != 0 {
ne := make([]mvccpb.Event, 0, len(wr.Events))
for i := range wr.Events {
filtered := false
for _, filter := range w.fcs {
if filter(wr.Events[i]) {
filtered = true
break
}
}
if !filtered {
ne = append(ne, wr.Events[i])
}
}
wr.Events = ne
}
// if all events are filtered out, we should send nothing.
if !progressEvent && len(wr.Events) == 0 {
return true
}
select {
case w.ch <- wr:
return true
default:
return false
}
}

9
mvcc/watcher.go
View File

@ -27,6 +27,9 @@ var (
type WatchID int64
// FilterFunc returns true if the given event should be filtered out.
type FilterFunc func(e mvccpb.Event) bool
type WatchStream interface {
// Watch creates a watcher. The watcher watches the events happening or
// happened on the given key or range [key, end) from the given startRev.
@ -37,7 +40,7 @@ type WatchStream interface {
// The returned `id` is the ID of this watcher. It appears as WatchID
// in events that are sent to the created watcher through stream channel.
//
Watch(key, end []byte, startRev int64) WatchID
Watch(key, end []byte, startRev int64, fcs ...FilterFunc) WatchID
// Chan returns a chan. All watch response will be sent to the returned chan.
Chan() <-chan WatchResponse
@ -95,7 +98,7 @@ type watchStream struct {
// Watch creates a new watcher in the stream and returns its WatchID.
// TODO: return error if ws is closed?
func (ws *watchStream) Watch(key, end []byte, startRev int64) WatchID {
func (ws *watchStream) Watch(key, end []byte, startRev int64, fcs ...FilterFunc) WatchID {
ws.mu.Lock()
defer ws.mu.Unlock()
if ws.closed {
@ -105,7 +108,7 @@ func (ws *watchStream) Watch(key, end []byte, startRev int64) WatchID {
id := ws.nextID
ws.nextID++
w, c := ws.watchable.watch(key, end, startRev, id, ws.ch)
w, c := ws.watchable.watch(key, end, startRev, id, ws.ch, fcs...)
ws.cancels[id] = c
ws.watchers[id] = w

37
mvcc/watcher_test.go
View File

@ -283,3 +283,40 @@ func TestWatcherRequestProgress(t *testing.T) {
t.Fatal("failed to receive progress")
}
}
func TestWatcherWatchWithFilter(t *testing.T) {
b, tmpPath := backend.NewDefaultTmpBackend()
s := WatchableKV(newWatchableStore(b, &lease.FakeLessor{}, nil))
defer cleanup(s, b, tmpPath)
w := s.NewWatchStream()
defer w.Close()
filterPut := func(e mvccpb.Event) bool {
return e.Type == mvccpb.PUT
}
w.Watch([]byte("foo"), nil, 0, filterPut)
done := make(chan struct{})
go func() {
<-w.Chan()
done <- struct{}{}
}()
s.Put([]byte("foo"), []byte("bar"), 0)
select {
case <-done:
t.Fatal("failed to filter put request")
case <-time.After(100 * time.Millisecond):
}
s.DeleteRange([]byte("foo"), nil)
select {
case <-done:
case <-time.After(100 * time.Millisecond):
t.Fatal("failed to receive delete request")
}
}