expose incoming call deadline to the server handler

[hugebdu]

Is your feature request related to a problem? Please describe.

Being able to access incoming request deadline might help with traceability and allow one to implement multi-transport SLA features - in our case we have several transports aside with gRPC and have our own SLA abstraction, which is mapped to gRPC deadlines for gRPC flows.

And it is available for java-grpc, didn't check other implementations.

Describe the solution you'd like

The value is available on the event.new_call. I guess it is just a matter of passing it into ServerUnaryCall (and friends).

Describe alternatives you've considered

none

Additional context

none

[murgatroid99]

We are not making any more feature changes to the Node grpc library, so it is unlikely that we will make this change there.

On the other hand, I would have no objection to making this change in the @grpc/grpc-js library, which you should use instead. However, that will be a bit more work because we will have to add in the conversion from the relative time representation on the wire to the absolute "deadline" representation.

[hugebdu]

@murgatroid99 thanks for your response.
would you consider accepting a PR?
IMO shouldn't be a breaking change

[murgatroid99]

I ended up implementing this in @grpc/grpc-js version 1.2.0 incidentally while addressing #1542. The server call classes now have a getDeadline method that returns the deadline.

[hugebdu]

@murgatroid99 thanks a lot, that's really helpful.

cc @alexandervain

[murgatroid99]

The grpc package is now deprecated so this change will not be made there. This change has been made in @grpc/grpc-js, so I consider this resolved.

[hugebdu]

perfect. thanks