etcdserver/api/v3rpc: clean up godoc

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

etcdserver/api/v3rpc/watch.go

@@ -42,6 +42,7 @@ type watchServer struct {
 	lg *zap.Logger
 }
 
+// NewWatchServer returns a new watch server.
 func NewWatchServer(s *etcdserver.EtcdServer) pb.WatchServer {
 	return &watchServer{
 		clusterID: int64(s.Cluster().ID()),
@@ -61,6 +62,7 @@ var (
 	progressReportIntervalMu sync.RWMutex
 )
 
+// GetProgressReportInterval returns the current progress report interval (for testing).
 func GetProgressReportInterval() time.Duration {
 	progressReportIntervalMu.RLock()
 	interval := progressReportInterval
@@ -74,20 +76,19 @@ func GetProgressReportInterval() time.Duration {
 	return interval + jitter
 }
 
+// SetProgressReportInterval updates the current progress report interval (for testing).
 func SetProgressReportInterval(newTimeout time.Duration) {
 	progressReportIntervalMu.Lock()
 	defer progressReportIntervalMu.Unlock()
 	progressReportInterval = newTimeout
 }
 
-const (
-	// We send ctrl response inside the read loop. We do not want
-	// send to block read, but we still want ctrl response we sent to
-	// be serialized. Thus we use a buffered chan to solve the problem.
-	// A small buffer should be OK for most cases, since we expect the
-	// ctrl requests are infrequent.
-	ctrlStreamBufLen = 16
-)
+// We send ctrl response inside the read loop. We do not want
+// send to block read, but we still want ctrl response we sent to
+// be serialized. Thus we use a buffered chan to solve the problem.
+// A small buffer should be OK for most cases, since we expect the
+// ctrl requests are infrequent.
+const ctrlStreamBufLen = 16
 
 // serverWatchStream is an etcd server side stream. It receives requests
 // from client side gRPC stream. It receives watch events from mvcc.WatchStream,
@@ -362,7 +363,7 @@ func (sws *serverWatchStream) sendLoop() {
 				Canceled:        canceled,
 			}
 
-			if _, hasId := ids[wresp.WatchID]; !hasId {
+			if _, okID := ids[wresp.WatchID]; !okID {
 				// buffer if id not yet announced
 				wrs := append(pending[wresp.WatchID], wr)
 				pending[wresp.WatchID] = wrs
@@ -446,6 +447,7 @@ func (sws *serverWatchStream) sendLoop() {
 				}
 				delete(pending, wid)
 			}
+
 		case <-progressTicker.C:
 			sws.mu.Lock()
 			for id, ok := range sws.progress {
@@ -455,6 +457,7 @@ func (sws *serverWatchStream) sendLoop() {
 				sws.progress[id] = true
 			}
 			sws.mu.Unlock()
+
 		case <-sws.closec:
 			return
 		}
@@ -484,6 +487,7 @@ func filterNoPut(e mvccpb.Event) bool {
 	return e.Type == mvccpb.PUT
 }
 
+// FiltersFromRequest returns "mvcc.FilterFunc" from a given watch create request.
 func FiltersFromRequest(creq *pb.WatchCreateRequest) []mvcc.FilterFunc {
 	filters := make([]mvcc.FilterFunc, 0, len(creq.Filters))
 	for _, ft := range creq.Filters {