增加监听一次key变化的处理

middleware/etcd/string_test.go

@@ -114,3 +114,48 @@ func TestWatchKeyWithCancelByChangeCallback(t *testing.T) {
 	}()
 	WatchKeyWithCancel(nil, key, dealFunc, cancelChan, cancelFunc)
 }
+
+// TestWatchKeyOnce ...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 4:50 下午 2021/11/23
+func TestWatchKeyOnce(t *testing.T) {
+	key := "name"
+	dealFunc := func(data *clientv3.Event) {
+		fmt.Println(string(data.Kv.Key), string(data.Kv.Value), data.Kv.Version, data.Kv.CreateRevision, data.Kv.ModRevision)
+	}
+
+	timeoutFunc := func(key string, timeout time.Duration) {
+		fmt.Println("监听超时", key, timeout)
+	}
+
+	timeout := 10 * time.Second
+	go func() {
+		for i := 0; i < 30; i++ {
+			_ = Put(nil, key, fmt.Sprintf("test-%d", i), 0)
+			time.Sleep(time.Second)
+		}
+	}()
+	WatchKeyOnce(nil, key, dealFunc, timeout, timeoutFunc)
+}
+
+// TestWatchKeyOnceForTimeout ...
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 4:53 下午 2021/11/23
+func TestWatchKeyOnceForTimeout(t *testing.T) {
+	key := "name"
+	dealFunc := func(data *clientv3.Event) {
+		fmt.Println(string(data.Kv.Key), string(data.Kv.Value), data.Kv.Version, data.Kv.CreateRevision, data.Kv.ModRevision)
+	}
+
+	timeoutFunc := func(key string, timeout time.Duration) {
+		fmt.Println("监听超时", key, timeout)
+	}
+
+	timeout := time.Second
+
+	WatchKeyOnce(nil, key, dealFunc, timeout, timeoutFunc)
+}