Elixir sockets made decent 
==========================
This library wraps `gen_tcp`, `gen_udp` and `gen_sctp`, `ssl` and implements
websockets and socks.
Sockets2 is a fork from the zombie project at: https://github.com/meh/elixir-socket updated for OTP20+ and with PRs from other forks merged.
Installation
--------
In your `mix.exs` file
```elixir
defp deps do
[
# ...
{:socket2, "~> 1.0"},
# ...
]
end
```
Then run `mix deps.get` to install
Examples
--------
```elixir
defmodule HTTP do
def get(uri) when is_binary(uri) or is_list(uri) do
get(URI.parse(uri))
end
def get(%URI{host: host, port: port, path: path}) do
sock = Socket.TCP.connect!(host, port, packet: :line)
sock |> Socket.Stream.send!("GET #{path || "/"} HTTP/1.1\r\nHost: #{host}\r\n\r\n")
[_, code, text] = Regex.run(~r"HTTP/1.1 (.*?) (.*?)\s*$", sock |> Socket.Stream.recv!())
headers = headers([], sock) |> Enum.into(%{})
sock |> Socket.packet!(:raw)
body = sock |> Socket.Stream.recv!(String.to_integer(headers["Content-Length"]))
{{String.to_integer(code), text}, headers, body}
end
defp headers(acc, sock) do
case sock |> Socket.Stream.recv!() do
"\r\n" ->
acc
line ->
[_, name, value] = Regex.run(~r/^(.*?):\s*(.*?)\s*$/, line)
headers([{name, value} | acc], sock)
end
end
end
```
Websockets
----------
### Client
```elixir
socket = Socket.Web.connect!("echo.websocket.org")
socket |> Socket.Web.send!({ :text, "test" })
socket |> Socket.Web.recv!() # => {:text, "test"}
```
In order to connect to a TLS websocket, use the `secure: true` option:
```elixir
socket = Socket.Web.connect!("echo.websocket.org", secure: true)
```
The `connect!` function also accepts other parameters, most notably the `path` parameter, which is used when the websocket server endpoint exists on a path below the domain ie. "example.com/websocket":
```elixir
socket = Socket.Web.connect!("example.com", path: "/websocket")
```
Note that websocket servers send ping messages. A pong reply from your client tells the server to keep the connection open and to send more data. If your client doesn't send a pong reply then the server will close the connection. Here's an example of how to get get both the data you want and reply to a server's pings:
```elixir
socket = Socket.Web.connect!("echo.websocket.org")
case socket |> Socket.Web.recv!() do
{:text, data} ->
# process data
{:ping, _ } ->
socket |> Socket.Web.send!({:pong, ""})
end
```
### Server
```elixir
server = Socket.Web.listen!(80)
client = server |> Socket.Web.accept!()
# here you can verify if you want to accept the request or not, call
# `Socket.Web.close!` if you don't want to accept it, or else call
# `Socket.Web.accept!`
client |> Socket.Web.accept!()
# echo the first message
client |> Socket.Web.send!(client |> Socket.Web.recv!())
```
