gRPC-Interceptors-using-go

prerequisites

• Go (https://go.dev/doc/install)
• protoc (https://grpc.io/docs/protoc-installation/)
• Evans CLI (https://github.com/ktr0731/evans#from-github-releases)
• code editor [I prefer Visual Studio Code]

Demo for gRPC Interceptors, I have created logging middleware using interceptors using go.

• To run this code, please clone this repository using below commands.

  git clone https://github.com/intelops/go-interceptors-demo.git

• Navigate to go-interceptors-demo

  cd go-interceptors-demo

• Update the go.mod file with each dependency that is required by your source files by downloading them all.

  go mod tidy

• Check Makefile for the common commands which I have used frequently.

  # to install grpc
  make install 
  
  # if path was not set, use
  make path
  
  # if proto gets updated, first remove pb folder using
  make clean
  
  # and run this command to recompile the proto file
  make protoc

• Run the server using

  go run main.go
  
  # if you see this in terminal, your server is working fine, else please check if anything is missing from above steps.
  
  #    Starting server in port :50051

• Open a new terminal and run the evans cli which works like a client:

  evans -r repl -p 50051
  
  # This command helps to choose the package 
  package demo
  
  # To check the services defined 
  show services
  
  :'
  # Output generated
  +-----------+------------+--------------+---------------+
  |  SERVICE  |    RPC     | REQUEST TYPE | RESPONSE TYPE |
  +-----------+------------+--------------+---------------+
  | MyService | DemoMethod | DemoRequest  | DemoResponse  |
  +-----------+------------+--------------+---------------+
  '
  # To call this method use this command
  call DemoMethod
  
  :'
  # Output generated
  # Example 1
  [email protected]:50051> call DemoMethod
  message (TYPE_STRING) => Dr.Strange
  {
    "message": "Hello Dr.Strange"
  }
  # Example 2
  [email protected]:50051> call DemoMethod
  message (TYPE_STRING) => Compage
  {
    "message": "Hello Compage"
  }
  
  #logs generated from server
  2023/03/31 23:37:40 Received request: message:"Dr.Strange"
  2023/03/31 23:39:16 Received request: message:"Compage"
  '
  # To stop CLI use this command
  exit