Fix the stream sending reliability

[abel-von]

Currently the send() method of stream implemented by send the value to an unbounded channel, so even the connection is closed for a long time, the send function still return succeed.

In this PR I add a channel to the message so that we can wait until the message is truely written to the connection.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 39 lines in your changes are missing coverage. Please review.

Project coverage is 25.08%. Comparing base (a9198f2) to head (c09e90f).
Report is 11 commits behind head on master.

❗ Current head c09e90f differs from pull request most recent head 3355f7d. Consider uploading reports for the commit 3355f7d to get more accurate results

Files	Patch %	Lines
src/asynchronous/stream.rs	0.00%	27 Missing ⚠️
src/asynchronous/connection.rs	0.00%	6 Missing ⚠️
src/asynchronous/client.rs	0.00%	3 Missing ⚠️
src/asynchronous/server.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
+ Coverage   24.97%   25.08%   +0.11%     
==========================================
  Files          16       16              
  Lines        2651     2719      +68     
==========================================
+ Hits          662      682      +20     
- Misses       1989     2037      +48     

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[jsturtevant]

Is this something that where check could be added in https://github.com/containerd/ttrpc-rust/blob/master/example/async-client.rs? Similar to what was done in

ttrpc-rust/example/async-stream-server.rs

Lines 138 to 139 in 6f12d9c

	// It verifies PR #208
	async fn echo_default_value(

[jsturtevant]

looks like ci is failing with #219

[abel-von]

Is this something that where check could be added in https://github.com/containerd/ttrpc-rust/blob/master/example/async-client.rs? Similar to what was done in

ttrpc-rust/example/async-stream-server.rs

Lines 138 to 139 in 6f12d9c

	// It verifies PR #208
	async fn echo_default_value(

I think it is hard to write test here because it is some exceptional cases, for example server side restart. or we can do it by disconnecting the underlying connection, but it seems we have no way to do it in client directly.

[abel-von]

looks like ci is failing with #219

I think it is now fixed.

[wllenyj]

This would make send synchronous, and it feels like this behavior should be implemented by the upper level user.
Or make it optional?

[abel-von]

I think maybe it is the best if ttrpc-rust behaves the same with https://github.com/containerd/ttrpc. The send in ttrpc golang seems synchronized as the channel is a blocking channel, as defined in https://github.com/containerd/ttrpc/blob/main/server.go#L338. so if underlying connection is closed, the send will also failed.

I think maybe we can not say this is "synchronized" as we don't really waiting for a acknowledgement from the other endpoint. we just make sure that the data is written into the connection.