grpc-gateway python example

client.py

from __future__ import print_function

import grpc

import helloworld_pb2
import helloworld_pb2_grpc

def run():
    channel = grpc.insecure_channel('localhost:8000')
    stub = helloworld_pb2_grpc.GreeterStub(channel)
    response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
    print("Greeter client received: " + response.message)


if __name__ == '__main__':
    run()

helloworld.proto

syntax = "proto3";

import "google/api/annotations.proto";

package helloworld;

// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply) {
    option (google.api.http) = {
      post: "/v1/hello"
      body: "*"
    };
  }
}

// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}

// The response message containing the greetings
message HelloReply {
  string message = 1;
}

Makefile

GATEWAY_FLAGS := -I. -I/usr/local/include -I$(GOPATH)/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis -I/usr/local/include

GRPC_FLAGS := --python_out=. --grpc_python_out=.

code:
    python -m grpc_tools.protoc $(GRPC_FLAGS) $(GATEWAY_FLAGS) *.proto

gw:
    protoc $(GATEWAY_FLAGS) \
        --go_out=Mgoogle/api/annotations.proto=github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis/google/api,plugins=grpc:. \
        --grpc-gateway_out=logtostderr=true:. \
        *.proto

deps:
    go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
    go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
    go get -u github.com/golang/protobuf/protoc-gen-go

server.py

from concurrent import futures
import time

import grpc

import helloworld_pb2
import helloworld_pb2_grpc

class Greeter(helloworld_pb2_grpc.GreeterServicer):
    def SayHello(self, request, context):
        return helloworld_pb2.HelloReply(message='Hello, {}'.format(request.name))


def serve():
    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
    server.add_insecure_port('[::]:8000')
    server.start()
    try:
        while True:
            time.sleep(86400)
    except KeyboardInterrupt:
        server.stop(0)

if __name__ == '__main__':
    serve()

After execute all of above, how can i use http api?

@ciiii

gw:
protoc $(GATEWAY_FLAGS)
--go_out=plugins=grpc:.
--grpc-gateway_out=logtostderr=true:.
*.proto

make gw
u can got helloworld.pb.go helloworld.pb.gw.go
then use golang to start the gateway server

look this docs

Is there no way to use python server.py to start the gateway server?
I thought this example can do it...

@ciiii

gw:
protoc $(GATEWAY_FLAGS)
--go_out=plugins=grpc:.
--grpc-gateway_out=logtostderr=true:.
*.proto

make gw
u can got helloworld.pb.go helloworld.pb.gw.go
then use golang to start the gateway server

look this docs

you are right.

got the same issue, and it could be found in
grpc-ecosystem/grpc-gateway#338
philips/grpc-gateway-example@1491225

Can you give me a working Example. How Can we run?

@fcharmy you can't. Actually it's just a reverse proxy, you could do that by yourself.

https://grpc-ecosystem.github.io/grpc-gateway/docs/faq/#my-grpc-server-is-written-in-scala-or-c-or-ruby-or-haskell-etc-is-there-a-scala-or-c-or-ruby-or-haskell-etc-version-of-grpc-gateway

Thanks, this was really helpful.

How do I call the REST API? On which port is it running?

I created an example repo on how to run a python grpc server with grpc-gateway for REST. Check it out here:
https://github.com/angelkjos/grpc-gateway-python-example