grpc-js: Rearrange some function calls to revert event order changes #2683
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This fixes #2681, according to manual testing. The goal is to ensure that the
cancelled
event is emitted after thefinish
event. First, insendStatus
, thenotifyOnCancel
call is moved to after actually sending the status. The most important part of that is moving it into thewantTrailers
event handler, so that it is only called after the stream is flushed, but it also needs to be in the other branches in that function. In addition, the callback in the_final
implementations is moved to before thesendStatus
call to get the right ordering if there is a trailers-only response, which will be sent synchronously.