An Elixir Websocket Client with some basic http proxy support.
A simple implemenation would be
defmodule WebSocketExample do
use WebSockex
def start_link(url, state) do
WebSockex.start_link(url, __MODULE__, state)
end
def handle_frame({type, msg}, state) do
IO.puts "Received Message - Type: #{inspect type} -- Message: #{inspect msg}"
{:ok, state}
end
endSee the examples/ directory for other examples or take a look at the documentation.
Add websockex to your list of dependencies in mix.exs:
def deps do
[{:websockex, "~> 0.4.0"}]
endEnsure websockex is started before your application:
def application do
[applications: [:websockex]]
endWebSockex supports the debugging mechanism for OTP Special Processes provided through the :sys module.
Since WebSockex rolls its own Special Process implementation, it's able to provide a lot more information than a regular
GenServer.
If, for example, I enable tracing with EchoClient from the examples (with Logger off), I would get this:
iex> {:ok, pid} = EchoClient.start_link(debug: [:trace])
*DBG* #PID<0.371.0> attempting to connect
*DBG* #PID<0.371.0> sucessfully connected
{:ok, #PID<0.371.0>}
iex> EchoClient.echo(pid, "Hello")
*DBG* #PID<0.371.0> sending frame: {:text, "Hello"}
:ok
*DBG* #PID<0.371.0> received frame: {:text, "Hello"}
*DBG* #PID<0.371.0> received frame: :ping
*DBG* #PID<0.371.0> replying from :handle_ping with :pong
iex> EchoClient.echo(pid, "Close the things!")
*DBG* #PID<0.371.0> sending frame: {:text, "Close the things!"}
:ok
*DBG* #PID<0.371.0> received frame: {:text, "Close the things!"}
*DBG* #PID<0.371.0> closing with local reason: {:local, :normal}
*DBG* #PID<0.371.0> sending close frame: {:local, :normal}
*DBG* #PID<0.371.0> forcefully closed the connection because the server was taking too long closeI could also enable tracing after a process has started like this:
iex> {:ok, pid} = EchoClient.start_link()
iex> :sys.trace(pid, true)
:ok
iex> EchoClient.echo(pid, "Hi")
*DBG* #PID<0.379.0> sending frame: {:text, "Hi"}
:ok
*DBG* #PID<0.379.0> received frame: {:text, "Hi"}