[ANN] Go gRPC Middleware and Prometheus monitoring

[michal.w....@gmail.com]

Hi,

First of all, I'd like to thank the gRPC Go team for the amazing community outreach during the design of Go gRPC server interceptors. It was a pleasure participating in the design process and I hope that future discussions will follow along similar lines.

Now that Go gRPC has support for server-side interceptors, we can use the API to do interesting things. 

https://github.com/mwitkow/go-grpc-middleware

Contains HTTP-like Middleware tools based on Interceptors, e.g. chaining, easy context modification etc.

I hope the repo to gather other futures that make writing gRPC middleware easy, ones that wouldn't belong in grpc-go upstream (like PR#653 that this repo's existence is inspired by).

https://github.com/mwitkow/go-grpc-prometheus

Contains a generic server-side Prometheus monitoring interceptor. Improbable.io has been using that code (from PR#299) for about a year. I'm working to incorporate feedback from Prometheus devs in the hope of standardizing the conventions. A Java implementation of Prometheus interceptor that follows these conventions is soon to follow.

Bug reports, PRs and idea contributions are very much welcome.

Michal Witkowski

Head of Infrastructure

Improbable