gRPC to gRPC

This recipe is a proxy gateway for gRPC end points.

Installation

• Install Go
• Install protoc-gen-go library

go get github.com/golang/protobuf/protoc-gen-go

• Download protoc for your respective OS from here.
  Extract protoc-$VERSION-$PLATFORM.zip file get the protoc binary from bin folder and configure it in PATH.

Setup

git clone https://github.com/project-flogo/grpc
cd grpc
go install
cd examples/json/grpc-to-grpc

Create the gateway:

flogo create -f flogo.json
cd MyProxy
flogo install github.com/project-flogo/grpc/proto/grpc2grpc
flogo build

Testing

Start proxy gateway.

FLOGO_RUNNER_TYPE=DIRECT bin/MyProxy

Start sample gRPC server.

go run main.go -server

#1 Testing PetById method

Run sample gRPC client.

go run main.go -client -port 9096 -method pet -param 2

Now you should see logs in proxy gateway terminal and sample gRPC server terminal. Sample output in client terminal can be seen as below.

res : pet:<id:2 name:"cat2" >

#2 Testing UserByName method

Run sample gRPC client.

go run main.go -client -port 9096 -method user -param user2

Output can be seen as below.

res : user:<id:2 username:"user2" email:"email2" phone:"phone2" >

#3 Testing ListUsers(Server Streaming) method

Run sample gRPC client.

go run main.go -client -port 9096 -method listusers

Streaming data can be observed at client side. Interrupt the sample server to stop streaming.

#4 Testing StoreUsers(Client Streaming) method

Run sample gRPC client.

go run main.go -client -port 9096 -method storeusers

Streaming data can be observed at server side. Interrupt the client to stop streaming.

#5 Testing BulkUsers(Bidirectional Streaming) method

Run sample gRPC client.

go run main.go -client -port 9096 -method bulkusers

Streaming data can be observed at both client and server side. One second delay is kept for veiwing purpose.