Feature/context

[rmichela]

No description provided.

[codecov]

Codecov Report

Merging #54 into master will increase coverage by 4.98%.
The diff coverage is 83.89%.

@@             Coverage Diff              @@
##             master      #54      +/-   ##
============================================
+ Coverage     53.26%   58.25%   +4.98%     
- Complexity      138      188      +50     
============================================
  Files            34       40       +6     
  Lines           766      915     +149     
  Branches         43       67      +24     
============================================
+ Hits            408      533     +125     
- Misses          341      359      +18     
- Partials         17       23       +6

Impacted Files	Coverage Δ	Complexity Δ
...alesforce/grpc/contrib/context/AmbientContext.java	77.5% <77.5%> (ø)	22 <22> (?)
...context/AmbientContextFreezeServerInterceptor.java	80% <80%> (ø)	2 <2> (?)
...ntrib/context/AmbientContextServerInterceptor.java	86.66% <86.66%> (ø)	9 <9> (?)
...ntext/AmbientContextEnforcerClientInterceptor.java	87.5% <87.5%> (ø)	7 <7> (?)
...ntext/AmbientContextEnforcerServerInterceptor.java	87.5% <87.5%> (ø)	7 <7> (?)
...ntrib/context/AmbientContextClientInterceptor.java	88.88% <88.88%> (ø)	3 <3> (?)
... and 2 more

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[cbornet]

I understand that the AmbientContext is a helper to get Metadata values from endpoint methods, is that correct ?
Do you know if there's a way to add metadata values to responses ?

[rmichela]

Request trailers can contain additional Metadata, although trailer metadata isn't readily accessible from stub API. Individual response messages cannot have their own metadata.

[cbornet]

The question is: can I get metadata in a Rxgrpc stub API from the Ambient context ?

[rmichela]

I haven't tried that yet, but it should work in theory. You would have to add the ambient context interceptors when using ManagedChannelBuilder and ServerBuilder. Since ambient context leverages the standard grpc Context, and RxGrpc correctly handles the Context, it should "just work".

[cbornet]

Great ! This can be very helpful !