Working example for Elixir EchoServer

The Elixir's sample code for Echo server doesn't exactly work for me. So i created my own EchoServer with some modification here and there. This supports multiple client request.


Here's the sample code

defmodule Processboy do

require Logger

@doc """

Starts accepting connections on the given `port`.

Processboy.Supervisor.start(nil, nil)

"""

def accept(port) do

{:ok, socket} = :gen_tcp.listen(port,

[:binary, packet: :line, active: false, reuseaddr: true])

Logger.info "Accepting connections on port #{port}"

loop_acceptor(socket)

end

def init() do

import Supervisor.Spec

children = [

supervisor(Task.Supervisor, [[name: Processboy, restart: :transient]])

]

#opts = [strategy: :one_for_one, name: Processboy]

{:ok, pid} = Supervisor.start_link(children, strategy: :one_for_one)

end

defp loop_acceptor(socket) do

{:ok, client} = :gen_tcp.accept(socket)

Logger.info "getting connections from client"

{:ok, pid} = Task.Supervisor.start_child(Processboy, fn -> serve(client) end)

:ok = :gen_tcp.controlling_process(client, pid)

loop_acceptor(socket)

end

defp serve(socket) do

socket

|> read_line()

|> write_line(socket)

serve(socket)

end

defp read_line(socket) do

{:ok, data} = :gen_tcp.recv(socket, 0)

data

end

defp write_line(line, socket) do

:gen_tcp.send(socket, line)

end

end

Running instruction.


Please fire up your Elixir command prompt using the following command :- iex -S mix.

Get the apps to start listening, you need to do the following :-

ProceProcessboy.init()

Processboy.accept(3001)

3001 is the default port and then you can simple telnet localhost 3001 to this port.