func doWatch(stream etcdserverpb.Watch_WatchClient, requests <-chan *etcdserverpb.WatchRequest) {
for r := range requests {
st := time.Now()
err := stream.Send(r)
var errStr string
if err != nil {
errStr = err.Error()
}
results <- &result{
errStr: errStr,
duration: time.Since(st),
}
bar.Increment()
}
wg.Done()
for {
_, err := stream.Recv()
var errStr string
if err != nil {
errStr = err.Error()
}
results <- &result{
errStr: errStr,
}
bar.Increment()
}
}
func doWatch(stream etcdserverpb.Watch_WatchClient, requests <-chan etcdserverpb.WatchRequest) {
for r := range requests {
st := time.Now()
err := stream.Send(&r)
var errStr string
if err != nil {
errStr = err.Error()
}
results <- result{errStr: errStr, duration: time.Since(st)}
bar.Increment()
}
atomic.AddInt32(&nrWatchCompleted, 1)
if atomic.LoadInt32(&nrWatchCompleted) == int32(watchTotalStreams) {
watchCompletedNotifier <- struct{}{}
}
<-putStartNotifier
for {
st := time.Now()
_, err := stream.Recv()
var errStr string
if err != nil {
errStr = err.Error()
}
results <- result{errStr: errStr, duration: time.Since(st)}
bar.Increment()
atomic.AddInt32(&nrRecvCompleted, 1)
if atomic.LoadInt32(&nrRecvCompleted) == int32(eventsTotal) {
recvCompletedNotifier <- struct{}{}
}
}
}
func recvLoop(wStream pb.Watch_WatchClient) {
for {
resp, err := wStream.Recv()
if err == io.EOF {
os.Exit(ExitSuccess)
}
if err != nil {
ExitWithError(ExitError, err)
}
fmt.Printf("%s: %s %s\n", resp.Event.Type, string(resp.Event.Kv.Key), string(resp.Event.Kv.Value))
}
}
func recvLoop(wStream pb.Watch_WatchClient) {
for {
resp, err := wStream.Recv()
if err == io.EOF {
os.Exit(0)
}
if err != nil {
panic(err)
}
fmt.Printf("%s: %s %s\n", resp.Event.Type, string(resp.Event.Kv.Key), string(resp.Event.Kv.Value))
}
}
// serveWatchClient forwards messages from the grpc stream to run()
func (w *watchGrpcStream) serveWatchClient(wc pb.Watch_WatchClient) {
for {
resp, err := wc.Recv()
if err != nil {
select {
case w.errc <- err:
case <-w.donec:
}
return
}
select {
case w.respc <- resp:
case <-w.donec:
return
}
}
}
// WaitResponse waits on the given stream for given duration.
// If there is no more events, true and a nil response will be
// returned closing the WatchClient stream. Or the response will
// be returned.
func WaitResponse(wc pb.Watch_WatchClient, timeout time.Duration) (bool, *pb.WatchResponse) {
rCh := make(chan *pb.WatchResponse)
go func() {
resp, _ := wc.Recv()
rCh <- resp
}()
select {
case nr := <-rCh:
return false, nr
case <-time.After(timeout):
}
wc.CloseSend()
rv, ok := <-rCh
if rv != nil || !ok {
return false, rv
}
return true, nil
}
// resumeWatchers rebuilds every registered watcher on a new client
func (w *watchGrpcStream) resumeWatchers(wc pb.Watch_WatchClient) error {
w.mu.RLock()
streams := make([]*watcherStream, 0, len(w.streams))
for _, ws := range w.streams {
streams = append(streams, ws)
}
w.mu.RUnlock()
for _, ws := range streams {
// drain recvc so no old WatchResponses (e.g., Created messages)
// are processed while resuming
ws.drain()
// pause serveStream
ws.resumec <- -1
// reconstruct watcher from initial request
if ws.lastRev != 0 {
ws.initReq.rev = ws.lastRev
}
if err := wc.Send(ws.initReq.toPB()); err != nil {
return err
}
// wait for request ack
resp, err := wc.Recv()
if err != nil {
return err
} else if len(resp.Events) != 0 || !resp.Created {
return fmt.Errorf("watcher: unexpected response (%+v)", resp)
}
// id may be different since new remote watcher; update map
w.mu.Lock()
delete(w.streams, ws.id)
ws.id = resp.WatchId
w.streams[ws.id] = ws
w.mu.Unlock()
// unpause serveStream
ws.resumec <- ws.lastRev
}
return nil
}
// waitResponse waits on the given stream for given duration.
// If there is no more events, true and a nil response will be
// returned closing the WatchClient stream. Or the response will
// be returned.
func waitResponse(wc pb.Watch_WatchClient, timeout time.Duration) (bool, *pb.WatchResponse) {
rCh := make(chan *pb.WatchResponse, 1)
donec := make(chan struct{})
defer close(donec)
go func() {
resp, _ := wc.Recv()
select {
case rCh <- resp:
case <-donec:
}
}()
select {
case nr := <-rCh:
return false, nr
case <-time.After(timeout):
}
// didn't get response
wc.CloseSend()
return true, nil
}
func recvLoop(wStream pb.Watch_WatchClient) {
for {
resp, err := wStream.Recv()
if err == io.EOF {
os.Exit(ExitSuccess)
}
if err != nil {
ExitWithError(ExitError, err)
}
switch {
// TODO: handle canceled/compacted and other control response types
case resp.Created:
fmt.Printf("watcher created: id %08x\n", resp.WatchId)
case resp.Canceled:
fmt.Printf("watcher canceled: id %08x\n", resp.WatchId)
default:
for _, ev := range resp.Events {
fmt.Printf("%s: %s %s\n", ev.Type, string(ev.Kv.Key), string(ev.Kv.Value))
}
}
}
}
// resumeWatchers rebuilds every registered watcher on a new client
func (w *watcher) resumeWatchers(wc pb.Watch_WatchClient) error {
streams := []*watcherStream{}
w.mu.RLock()
for _, ws := range w.streams {
streams = append(streams, ws)
}
w.mu.RUnlock()
for _, ws := range streams {
// reconstruct watcher from initial request
if ws.lastRev != 0 {
ws.initReq.rev = ws.lastRev
}
if err := wc.Send(ws.initReq.toPB()); err != nil {
return err
}
// wait for request ack
resp, err := wc.Recv()
if err != nil {
return err
} else if len(resp.Events) != 0 || resp.Created != true {
return fmt.Errorf("watcher: unexpected response (%+v)", resp)
}
// id may be different since new remote watcher; update map
w.mu.Lock()
delete(w.streams, ws.id)
ws.id = resp.WatchId
w.streams[ws.id] = ws
w.mu.Unlock()
ws.resumec <- ws.lastRev
}
return nil
}
