etcd watch function support asynchronous method

[MJEdwin]

when i use dotnet-etcd some watch method,it was blocked my code and i can not run code after watch method invoked

code:

etcdClient.Watch("services", WatchDelegate, cancellationToken: cancellationTokenSource.Token); //blocked

//Set
await etcdClient.PutAsync(new PutRequest { Key = ByteString.CopyFromUtf8("services"), Value = ByteString.CopyFromUtf8("test") });
await etcdClient.PutAsync("services/demo", "test");

future:

add asynchronous method

Task watchTask = etcdClient.WatchAsync("services", WatchDelegate, cancellationToken: cancellationTokenSource.Token); //unblocked
//Set
await etcdClient.PutAsync(new PutRequest { Key = ByteString.CopyFromUtf8("services"), Value = ByteString.CopyFromUtf8("test") });
await etcdClient.PutAsync("services/demo", "test");
await watchTask;   //blocked

[shubhamranjan]

Hi, With the current implementation you can use other watch overloads which accept WatchRequest instead of a string param. You can create a watch request like this:

            WatchRequest request = new WatchRequest()
            {
                CreateRequest = new WatchCreateRequest()
                {
                    Key = ByteString.CopyFromUtf8(services)
                }
            };

and pass it over.

There are a lot of async overloads here.

I agree that there should be overloads for string params as well since there is one for sync calls. I will keep this open until I provide one.