Go’s RPC Package

https://pkg.go.dev/net/rpc

methods used pkg-functions

For a function to be called remotely for RPC

• should be method i.e., should have receiver as per Go
• should be public (name starts with uppercase)
• should have 2 args
  • 1st arg can be interpreted as request body
  • 2nd arg is pointer to response body struct, called as reply
• return error type
  • when method reaches end return nil

Now we can call our struct/type which acts as receiver for these procedures/methods

Server

• create obj from struct which can be called remotely

• start listening :port (this step can be done afterwards)

• server way

  • server obj need to be created
  • register struct obj with rpc server
  • in an infinite loop, continuously
    • accept connections from listener with Accept()
    • server connection with server obj

• raw-dogging way

  • register struct obj with net/rpc
  • handle http and start serving

  // ignore err handling
   
  var obj = new(type)
  lis, err := net.Listen("tcp", ":port")
  defer lis.close()
   
  // server way
  svr := rpc.NewServer()
  svr.Register(obj)
  for {
  	conn, err := lis.Accept()
  	svr.ServeConn(conn)
  }
   
  // raw-dogging way
  rpc.Register(obj)
  rpc.HandleHTTP()
  http.Serve(lis, nil)
   
  // either way, rpc will be served on :port 

Client

• we’ll have same types/structs as used in server
• additional to those, reqBody and resp struct(s) should be created accordingly
• response of function call will in resp

client, err := rpc.DialHTTP("tcp", ":port")
 
client.Call("Type.Method", reqBody, &resp)