%% Copyright (c) 2011, Loïc Hoguin %% %% Permission to use, copy, modify, and/or distribute this software for any %% purpose with or without fee is hereby granted, provided that the above %% copyright notice and this permission notice appear in all copies. %% %% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES %% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF %% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR %% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES %% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN %% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF %% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. %% @doc TCP transport API. %% %% Wrapper around gen_tcp implementing the Cowboy transport API. %% %% @see gen_tcp -module(cowboy_tcp_transport). -export([name/0, messages/0, listen/1, accept/2, recv/3, send/2, setopts/2, controlling_process/2, peername/1, close/1, sockname/1]). %% @doc Name of this transport API, tcp. -spec name() -> tcp. name() -> tcp. %% @doc Atoms used in the process messages sent by this API. %% %% They identify incoming data, closed connection and errors when receiving %% data in active mode. -spec messages() -> {tcp, tcp_closed, tcp_error}. messages() -> {tcp, tcp_closed, tcp_error}. %% @doc Setup a socket to listen on the given port on the local host. %% %% The available options are: %%
%%
port
Mandatory. TCP port number to open.
%%
backlog
Maximum length of the pending connections queue. %% Defaults to 1024.
%%
ip
Interface to listen on. Listen on all interfaces %% by default.
%%
%% %% @see gen_tcp:listen/2 -spec listen([{port, inet:port_number()} | {ip, inet:ip_address()}]) -> {ok, inet:socket()} | {error, atom()}. listen(Opts) -> {port, Port} = lists:keyfind(port, 1, Opts), Backlog = proplists:get_value(backlog, Opts, 1024), ListenOpts0 = [binary, {active, false}, {backlog, Backlog}, {packet, raw}, {reuseaddr, true}], ListenOpts = case lists:keyfind(ip, 1, Opts) of false -> ListenOpts0; Ip -> [Ip|ListenOpts0] end, gen_tcp:listen(Port, ListenOpts). %% @doc Accept an incoming connection on a listen socket. %% @see gen_tcp:accept/2 -spec accept(inet:socket(), timeout()) -> {ok, inet:socket()} | {error, closed | timeout | atom()}. accept(LSocket, Timeout) -> gen_tcp:accept(LSocket, Timeout). %% @doc Receive a packet from a socket in passive mode. %% @see gen_tcp:recv/3 -spec recv(inet:socket(), non_neg_integer(), timeout()) -> {ok, any()} | {error, closed | atom()}. recv(Socket, Length, Timeout) -> gen_tcp:recv(Socket, Length, Timeout). %% @doc Send a packet on a socket. %% @see gen_tcp:send/2 -spec send(inet:socket(), iolist()) -> ok | {error, atom()}. send(Socket, Packet) -> gen_tcp:send(Socket, Packet). %% @doc Set one or more options for a socket. %% @see inet:setopts/2 -spec setopts(inet:socket(), list()) -> ok | {error, atom()}. setopts(Socket, Opts) -> inet:setopts(Socket, Opts). %% @doc Assign a new controlling process Pid to Socket. %% @see gen_tcp:controlling_process/2 -spec controlling_process(inet:socket(), pid()) -> ok | {error, closed | not_owner | atom()}. controlling_process(Socket, Pid) -> gen_tcp:controlling_process(Socket, Pid). %% @doc Return the address and port for the other end of a connection. %% @see inet:peername/1 -spec peername(inet:socket()) -> {ok, {inet:ip_address(), inet:port_number()}} | {error, atom()}. peername(Socket) -> inet:peername(Socket). %% @doc Close a TCP socket. %% @see gen_tcp:close/1 -spec close(inet:socket()) -> ok. close(Socket) -> gen_tcp:close(Socket). %% @doc Get the local address and port of a socket %% @see inet:sockname/1 -spec sockname(inet:socket()) -> {ok, {inet:ip_address(), inet:port_number()}} | {error, atom()}. sockname(Socket) -> inet:sockname(Socket).