Merge pull request #1 from yixinguo-ssc/fix/grpc-gateway-proto3-optional

fix(grpc): Fix error "proto3 disallow 'optional' label"

Author: yixinguo-ssc

kong/tools/grpc.lua

@@ -77,6 +77,7 @@ function _M.new()
     protoc_instance:addpath(v)
   end
   protoc_instance.include_imports = true
+  protoc_instance.proto3_optional = true
 
   return setmetatable({
     protoc_instance = protoc_instance,

spec/fixtures/grpc/targetservice.proto

@@ -56,7 +56,7 @@ service Bouncer {
 
 message HelloRequest {
   string greeting = 1;
-  bool boolean_test = 2;
+  optional bool boolean_test = 2;
 }
 
 message HelloResponse {