How to implement gRPC Gateway in a node backend

Question

I'm trying to implement gRPC gateway in a Node.JS server following the installation guide.

The steps are writen for golang but I tried to do in Node.JS.

I found this response, and also some packages like this one so is possible implement in node.

After read "insatallation guide", the main problem seems to be get the binary files:

• protoc-gen-grpc-gateway
• protoc-gen-openapiv2
• protoc-gen-go
• protoc-gen-go-grpc

I have downloaded first two binaries from here so the problem maybe are last two.

I assume go is from golang so I have to search something like protoc-gen-node-grpc. And I've seen this npm package, but, I want to implement by myself as much as is possible. I don't want to depends from third-party people.

At this point I have first to binaries into my path but no the last two.

Once defined gRPC service, next step is generate gRPC stubs. I have this line:

RUN protoc -I=. mygrpc.proto --js_out=import_style=commonjs,binary:./my/folder/ --grpc-web_out=import_style=commonjs,mode=grpcwebtext:./my/folder/

And this generate the files ok. I don't know if I have to use --js_out and --grpc-web_out to create client and service files.

Then, next step is to generate reverse-proxy using protoc-gen-grpc-gateway.

I do (as guide says):

protoc -I=./my/path/ myproto.proto 
  --grpc-gateway_out ./my/path/ 
    --grpc-gateway_opt logtostderr=true 
    --grpc-gateway_opt paths=source_relative 
    --grpc-gateway_opt generate_unbound_methods=true

And this generate a .go file: myproto.pb.gw.go.

Into the file says:

// Code generated by protoc-gen-grpc-gateway. DO NOT EDIT.
// source: myproto.proto

/*
Package myproto is a reverse proxy.

It translates gRPC into RESTful JSON APIs.
*/

So I assume steps are correctly done but: How can I execute this into my Node.JS server?

I have a node project using a Express API, I want to use grpc-gateway instead of express API endpoint... but I only have a .go file.

My proto version is:

libprotoc 3.14.0

Thanks in advance.

question from:https://stackoverflow.com/questions/65617258/how-to-implement-grpc-gateway-in-a-node-backend

Answer 1

As the issue comment, grpc-gateway only generate Go code. Feel free to use Go, there only need generate code from proto and add service. You can reference my sample code in Java helloworlde/grpc-gateway; And buf is better than protoc to generate code. If you want write all by yourself, you can reference ReflectionCall.java wirte in Java, it can call server without generate code.