本文整理汇总了Golang中github.com/coreos/etcd/store.Watcher类的典型用法代码示例。如果您正苦于以下问题：Golang Watcher类的具体用法？Golang Watcher怎么用？Golang Watcher使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了Watcher类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: waitForEvent
// waitForEvent waits for a given Watcher to return its associated
// event. It returns a non-nil error if the given Context times out
// or the given ResponseWriter triggers a CloseNotify.
func waitForEvent(ctx context.Context, w http.ResponseWriter, wa store.Watcher) (*store.Event, error) {
// TODO(bmizerany): support streaming?
defer wa.Remove()
var nch <-chan bool
if x, ok := w.(http.CloseNotifier); ok {
nch = x.CloseNotify()
}
select {
case ev := <-wa.EventChan():
return ev, nil
case <-nch:
elog.TODO()
return nil, errClosed
case <-ctx.Done():
return nil, ctx.Err()
}
}示例2: handleKeyWatch
func handleKeyWatch(ctx context.Context, w http.ResponseWriter, wa store.Watcher, stream bool, rt etcdserver.RaftTimer) {
defer wa.Remove()
ech := wa.EventChan()
var nch <-chan bool
if x, ok := w.(http.CloseNotifier); ok {
nch = x.CloseNotify()
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("X-Etcd-Index", fmt.Sprint(wa.StartIndex()))
w.Header().Set("X-Raft-Index", fmt.Sprint(rt.Index()))
w.Header().Set("X-Raft-Term", fmt.Sprint(rt.Term()))
w.WriteHeader(http.StatusOK)
// Ensure headers are flushed early, in case of long polling
w.(http.Flusher).Flush()
for {
select {
case <-nch:
// Client closed connection. Nothing to do.
return
case <-ctx.Done():
// Timed out. net/http will close the connection for us, so nothing to do.
return
case ev, ok := <-ech:
if !ok {
// If the channel is closed this may be an indication of
// that notifications are much more than we are able to
// send to the client in time. Then we simply end streaming.
return
}
ev = trimEventPrefix(ev, etcdserver.StoreKeysPrefix)
if err := json.NewEncoder(w).Encode(ev); err != nil {
// Should never be reached
plog.Warningf("error writing event (%v)", err)
return
}
if !stream {
return
}
w.(http.Flusher).Flush()
}
}
}