simple-tcp-ip-server

simple-tcp-ip-server example

Using the standard net package to build a simple tcp server to handle requests concurrently over ip (tcp/ip).

Table of Contents,

• REST vs TCP/IP
• HOW IT WORKS
• RUN
  • USING NETCAT

GitHub Webpage

REST vs TCP/IP

REST does not have state, whereas tcp has an open connection and you can assume a lot about the server.

HOW IT WORKS

The net package lets us listen for tcp connections and handle those requests over that connection.

1. Set which IP and port you would like to listen on,

   server, err := net.Listen("tcp", "127.0.0.1:1234")
   

2. Create a connection for each request (concurrently),

   conn, err := server.Accept()
   go handleRequest(conn)
   

3. Create your handler handleRequest(),

   rw := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
   cmd, err := rw.ReadString('\n')
   

4. Create your handler functions like handleAdd(),

    handleAdd(rw)
   

This illustration may help,

RUN

go run simple-tcp-ip-server.go \
       requests.go handlers.go

Press return to exit.

You can interact with the tcp server in many ways

USING NETCAT

In another terminal, use the nc command which runs Netcat, a utility for sending raw data over a network connection.

netcat -q -1 localhost 1234
nc -q -1 localhost 1234

Now you can issue commands such as,

ADD
4
5
SUBTRACT
5
4

You can have as many connections as you like open.