Fix for referenced enums in field params

[sgtsquiggs]

Fixes #1203

Basically this compares the Enum's source file to the source of the Service instead of the source of the Message. Enum & Message could be from an external source, but Service will always be current source.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 54.09%. Comparing base (7988867) to head (0997306).

Files with missing lines	Patch %	Lines
examples/internal/server/a_bit_of_everything.go	0.00%	4 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1453      +/-   ##
==========================================
- Coverage   54.14%   54.09%   -0.05%     
==========================================
  Files          42       42              
  Lines        4375     4379       +4     
==========================================
  Hits         2369     2369              
- Misses       1750     1754       +4     
  Partials      256      256              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[johanbrandhorst]

Hi Matthew, thanks a lot for this fix! I would appreciate if we could create a test case that fails before this fix is applied. It could just be a matter of adding an imported enum to one of the messages that is used in one of the example proto files in such a way that it would have triggered this bug before the fix. Maybe somewhere in https://github.com/grpc-ecosystem/grpc-gateway/blob/master/examples/internal/proto/examplepb/a_bit_of_everything.proto? See https://github.com/grpc-ecosystem/grpc-gateway/blob/master/CONTRIBUTING.md#i-want-to-regenerate-the-files-after-making-changes for how to regenerate the files after changing them.

Thanks!

[sgtsquiggs]

Let me know if the tests aren't sufficient. They do recreate the situation I was experiencing.

[johanbrandhorst]

Perfect, thank you so much!

[johanbrandhorst]

Thanks for your contribution! Could you please cherry pick this against the v2 branch as well?