Go gRPC Services

gRPC's contract-first model only pays off if the contract is treated as an API: versioned packages, deliberate error codes, deadlines everywhere, and interceptors for everything cross-cutting.

1. Proto Design Rules

syntax = "proto3";

package payment.v1;                            // version IN the package
option go_package = "github.com/acme/payment-service/gen/payment/v1;paymentv1";

service PaymentService {
  rpc CreatePayment(CreatePaymentRequest) returns (CreatePaymentResponse);
}