[fix] [issue 877] Fix ctx in partitionProducer.Send() is not performing as expected

[Gleiphir2769]

Fixes #877

Motivation

The original PR is #878. Because the original author @billowqiu has not continued to reply to the review comments for a long time, resubmit the fix here.

Modifications

• Add select for ctx and doneCh in partitionProducer.Send()

Verifying this change

• Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / GoDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[RobertIndie]

Could you add a test?

[Gleiphir2769]

Could you add a test?

Hi @RobertIndie , a unit test has been added.