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client/v3 fix watch API blocked forever even with WithRequireLeader option #17622

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client/v3 fix watch API blocked forever even with WithRequireLeader option #17622

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5 changes: 3 additions & 2 deletions client/v3/watch.go
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Original file line number Diff line number Diff line change
Expand Up @@ -455,12 +455,13 @@ func (w *watcher) closeStream(wgs *watchGRPCStream) {
w.mu.Unlock()
}

func (w *watchGRPCStream) addSubstream(resp *pb.WatchResponse, ws *watcherStream) {
func (w *watchGRPCStream) addSubstream(resp *pb.WatchResponse, ws *watcherStream, closing map[*watcherStream]struct{}) {
// check watch ID for backward compatibility (<= v3.3)
if resp.WatchId == InvalidWatchID || (resp.Canceled && resp.CancelReason != "") {
w.closeErr = v3rpc.Error(errors.New(resp.CancelReason))
// failed; no channel
close(ws.recvc)
closing[ws] = struct{}{}
return
}
ws.id = resp.WatchId
Expand Down Expand Up @@ -591,7 +592,7 @@ func (w *watchGRPCStream) run() {
// response to head of queue creation
if len(w.resuming) != 0 {
if ws := w.resuming[0]; ws != nil {
w.addSubstream(pbresp, ws)
w.addSubstream(pbresp, ws, closing)
w.dispatchEvent(pbresp)
w.resuming[0] = nil
}
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