gRPC Kit

This repository contains helpers working with gRPC.

gRPC Duplex

For cases where you would like to serve both the gRPC endpoint and a gRPC Gateway, the chainguard.dev/grpc/pkg/duplex package is a helpful wrapper.

First, define the REST endpoints in the .proto file. Then change to use the duplex object to start and build up the gRPC server. Example:

d := duplex.New(8080)

pb.Register<Type>Server(d.Server, impl.New<Type>Server())
if err := d.RegisterHandler(ctx, impl.Register<Type>ServiceHandlerFromEndpoint); err != nil {
    log.Panicf("Failed to register gateway endpoint: %v", err)
}

...

if err := d.ListenAndServe(ctx); err != nil {
    log.Panicf("ListenAndServe() = %v", err)
}

Run this and you should see a message like:

Duplex gRPC/HTTP server starting at ::8080

Options

You can pass grpc.ServerOption and runtime.NewServeMux into duplex.New.

For example, if you wanted to make a duplex server with a unary interceptor:

d := duplex.New(port, grpc.UnaryInterceptor(myInterceptorFn))