Import the acceptor code from Cowboy

Modules were renamed. The 'cowboy_' prefix became 'ranch_'.
At the same time, ranch_ssl_transport became ranch_ssl,
and ranch_tcp_transport became ranch_tcp, because appending
'_transport' felt a bit redundant considering SSL and TCP
clearly are transports.

One test has been added to make sure everything is working.

11 files changed, 935 insertions, 0 deletions

diff --git a/src/ranch.app.src b/src/ranch.app.src
new file mode 100644
index 0000000..becbe4c
--- /dev/null
+++ b/src/ranch.app.src
@@ -0,0 +1,26 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+{application, ranch, [
+	{description, "Socket acceptor pool for TCP protocols."},
+	{vsn, "0.1.0"},
+	{modules, []},
+	{registered, [ranch_sup]},
+	{applications, [
+		kernel,
+		stdlib
+	]},
+	{mod, {ranch_app, []}},
+	{env, []}
+]}.
diff --git a/src/ranch.erl b/src/ranch.erl
new file mode 100644
index 0000000..ab9d767
--- /dev/null
+++ b/src/ranch.erl
@@ -0,0 +1,114 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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 Ranch API to start and stop listeners.
+-module(ranch).
+
+-export([start_listener/6, stop_listener/1, child_spec/6, accept_ack/1,
+	get_protocol_options/1, set_protocol_options/2]).
+
+%% @doc Start a listener for the given transport and protocol.
+%%
+%% A listener is effectively a pool of <em>NbAcceptors</em> acceptors.
+%% Acceptors accept connections on the given <em>Transport</em> and forward
+%% connections to the given <em>Protocol</em> handler. Both transport and
+%% protocol modules can be given options through the <em>TransOpts</em> and
+%% the <em>ProtoOpts</em> arguments. Available options are documented in the
+%% <em>listen</em> transport function and in the protocol module of your choice.
+%%
+%% All acceptor and connection processes are supervised by the listener.
+%%
+%% It is recommended to set a large enough number of acceptors to improve
+%% performance. The exact number depends of course on your hardware, on the
+%% protocol used and on the number of expected simultaneous connections.
+%%
+%% The <em>Transport</em> option <em>max_connections</em> allows you to define
+%% the maximum number of simultaneous connections for this listener. It defaults
+%% to 1024. See <em>ranch_listener</em> for more details on limiting the number
+%% of connections.
+%%
+%% <em>Ref</em> can be used to stop the listener later on.
+-spec start_listener(any(), non_neg_integer(), module(), any(), module(), any())
+	-> {ok, pid()}.
+start_listener(Ref, NbAcceptors, Transport, TransOpts, Protocol, ProtoOpts)
+		when is_integer(NbAcceptors) andalso is_atom(Transport)
+		andalso is_atom(Protocol) ->
+	supervisor:start_child(ranch_sup, child_spec(Ref, NbAcceptors,
+		Transport, TransOpts, Protocol, ProtoOpts)).
+
+%% @doc Stop a listener identified by <em>Ref</em>.
+%%
+%% Note that stopping the listener will close all currently running
+%% connections abruptly.
+-spec stop_listener(any()) -> ok | {error, not_found}.
+stop_listener(Ref) ->
+	case supervisor:terminate_child(ranch_sup, {ranch_listener_sup, Ref}) of
+		ok ->
+			supervisor:delete_child(ranch_sup, {ranch_listener_sup, Ref});
+		{error, Reason} ->
+			{error, Reason}
+	end.
+
+%% @doc Return a child spec suitable for embedding.
+%%
+%% When you want to embed Ranch in another application, you can use this
+%% function to create a <em>ChildSpec</em> suitable for use in a supervisor.
+%% The parameters are the same as in <em>start_listener/6</em> but rather
+%% than hooking the listener to the Ranch internal supervisor, it just returns
+%% the spec.
+-spec child_spec(any(), non_neg_integer(), module(), any(), module(), any())
+	-> supervisor:child_spec().
+child_spec(Ref, NbAcceptors, Transport, TransOpts, Protocol, ProtoOpts)
+		when is_integer(NbAcceptors) andalso is_atom(Transport)
+		andalso is_atom(Protocol) ->
+	{{ranch_listener_sup, Ref}, {ranch_listener_sup, start_link, [
+		NbAcceptors, Transport, TransOpts, Protocol, ProtoOpts
+	]}, permanent, 5000, supervisor, [ranch_listener_sup]}.
+
+%% @doc Acknowledge the accepted connection.
+%%
+%% Effectively used to make sure the socket control has been given to
+%% the protocol process before starting to use it.
+-spec accept_ack(pid()) -> ok.
+accept_ack(ListenerPid) ->
+	receive {shoot, ListenerPid} -> ok end.
+
+%% @doc Return the current protocol options for the given listener.
+-spec get_protocol_options(any()) -> any().
+get_protocol_options(Ref) ->
+	ListenerPid = ref_to_listener_pid(Ref),
+	{ok, ProtoOpts} = ranch_listener:get_protocol_options(ListenerPid),
+	ProtoOpts.
+
+%% @doc Upgrade the protocol options for the given listener.
+%%
+%% The upgrade takes place at the acceptor level, meaning that only the
+%% newly accepted connections receive the new protocol options. This has
+%% no effect on the currently opened connections.
+-spec set_protocol_options(any(), any()) -> ok.
+set_protocol_options(Ref, ProtoOpts) ->
+	ListenerPid = ref_to_listener_pid(Ref),
+	ok = ranch_listener:set_protocol_options(ListenerPid, ProtoOpts).
+
+%% Internal.
+
+-spec ref_to_listener_pid(any()) -> pid().
+ref_to_listener_pid(Ref) ->
+	Children = supervisor:which_children(ranch_sup),
+	{_, ListenerSupPid, _, _} = lists:keyfind(
+		{ranch_listener_sup, Ref}, 1, Children),
+	ListenerSupChildren = supervisor:which_children(ListenerSupPid),
+	{_, ListenerPid, _, _} = lists:keyfind(
+		ranch_listener, 1, ListenerSupChildren),
+	ListenerPid.
diff --git a/src/ranch_acceptor.erl b/src/ranch_acceptor.erl
new file mode 100644
index 0000000..f35b025
--- /dev/null
+++ b/src/ranch_acceptor.erl
@@ -0,0 +1,57 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+%% @private
+-module(ranch_acceptor).
+
+-export([start_link/6]). %% API.
+-export([acceptor/7]). %% Internal.
+
+%% API.
+
+-spec start_link(inet:socket(), module(), module(), any(),
+	pid(), pid()) -> {ok, pid()}.
+start_link(LSocket, Transport, Protocol, Opts,
+		ListenerPid, ConnsSup) ->
+	Pid = spawn_link(?MODULE, acceptor,
+		[LSocket, Transport, Protocol, Opts, 1, ListenerPid, ConnsSup]),
+	{ok, Pid}.
+
+%% Internal.
+
+-spec acceptor(inet:socket(), module(), module(), any(),
+	non_neg_integer(), pid(), pid()) -> no_return().
+acceptor(LSocket, Transport, Protocol, Opts, OptsVsn, ListenerPid, ConnsSup) ->
+	Res = case Transport:accept(LSocket, 2000) of
+		{ok, CSocket} ->
+			{ok, Pid} = supervisor:start_child(ConnsSup,
+				[ListenerPid, CSocket, Transport, Protocol, Opts]),
+			Transport:controlling_process(CSocket, Pid),
+			ranch_listener:add_connection(ListenerPid,
+				default, Pid, OptsVsn);
+		{error, timeout} ->
+			ranch_listener:check_upgrades(ListenerPid, OptsVsn);
+		{error, _Reason} ->
+			%% @todo Probably do something here. If the socket was closed,
+			%%       we may want to try and listen again on the port?
+			ok
+	end,
+	case Res of
+		ok ->
+			?MODULE:acceptor(LSocket, Transport, Protocol,
+				Opts, OptsVsn, ListenerPid, ConnsSup);
+		{upgrade, Opts2, OptsVsn2} ->
+			?MODULE:acceptor(LSocket, Transport, Protocol,
+				Opts2, OptsVsn2, ListenerPid, ConnsSup)
+	end.
diff --git a/src/ranch_acceptors_sup.erl b/src/ranch_acceptors_sup.erl
new file mode 100644
index 0000000..3b32668
--- /dev/null
+++ b/src/ranch_acceptors_sup.erl
@@ -0,0 +1,48 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+%% @private
+-module(ranch_acceptors_sup).
+-behaviour(supervisor).
+
+-export([start_link/7]). %% API.
+-export([init/1]). %% supervisor.
+
+%% API.
+
+-spec start_link(non_neg_integer(), module(), any(),
+	module(), any(), pid(), pid()) -> {ok, pid()}.
+start_link(NbAcceptors, Transport, TransOpts,
+		Protocol, ProtoOpts, ListenerPid, ConnsPid) ->
+	supervisor:start_link(?MODULE, [NbAcceptors, Transport, TransOpts,
+		Protocol, ProtoOpts, ListenerPid, ConnsPid]).
+
+%% supervisor.
+
+-spec init([any()]) -> {'ok', {{'one_for_one', 10, 10}, [{
+	any(), {atom() | tuple(), atom(), 'undefined' | [any()]},
+	'permanent' | 'temporary' | 'transient',
+	'brutal_kill' | 'infinity' | non_neg_integer(),
+	'supervisor' | 'worker',
+	'dynamic' | [atom() | tuple()]}]
+}}.
+init([NbAcceptors, Transport, TransOpts,
+		Protocol, ProtoOpts, ListenerPid, ConnsPid]) ->
+	{ok, LSocket} = Transport:listen(TransOpts),
+	Procs = [{{acceptor, self(), N}, {ranch_acceptor, start_link, [
+				LSocket, Transport, Protocol, ProtoOpts,
+				ListenerPid, ConnsPid
+      ]}, permanent, brutal_kill, worker, []}
+		|| N <- lists:seq(1, NbAcceptors)],
+	{ok, {{one_for_one, 10, 10}, Procs}}.
diff --git a/src/ranch_app.erl b/src/ranch_app.erl
new file mode 100644
index 0000000..0dc687c
--- /dev/null
+++ b/src/ranch_app.erl
@@ -0,0 +1,53 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+%% @private
+-module(ranch_app).
+-behaviour(application).
+
+-export([start/2, stop/1, profile_output/0]). %% API.
+
+-type application_start_type() :: normal
+	| {takeover, node()} | {failover, node()}.
+
+%% API.
+
+-spec start(application_start_type(), any()) -> {ok, pid()}.
+start(_Type, _Args) ->
+	consider_profiling(),
+	ranch_sup:start_link().
+
+-spec stop(any()) -> ok.
+stop(_State) ->
+	ok.
+
+-spec profile_output() -> ok.
+profile_output() ->
+	eprof:stop_profiling(),
+	eprof:log("procs.profile"),
+	eprof:analyze(procs),
+	eprof:log("total.profile"),
+	eprof:analyze(total).
+
+%% Internal.
+
+-spec consider_profiling() -> profiling | not_profiling.
+consider_profiling() ->
+	case application:get_env(profile) of
+		{ok, true} ->
+			{ok, _Pid} = eprof:start(),
+			eprof:start_profiling([self()]);
+		_ ->
+			not_profiling
+	end.
diff --git a/src/ranch_conns_sup.erl b/src/ranch_conns_sup.erl
new file mode 100644
index 0000000..41c1919
--- /dev/null
+++ b/src/ranch_conns_sup.erl
@@ -0,0 +1,44 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+%% @private
+-module(ranch_conns_sup).
+-behaviour(supervisor).
+
+-export([start_link/0, start_protocol/5]). %% API.
+-export([init/1]). %% supervisor.
+
+%% API.
+
+-spec start_link() -> {ok, pid()}.
+start_link() ->
+	supervisor:start_link(?MODULE, []).
+
+-spec start_protocol(pid(), inet:socket(), module(), module(), any())
+	-> {ok, pid()}.
+start_protocol(ListenerPid, Socket, Transport, Protocol, Opts) ->
+	Protocol:start_link(ListenerPid, Socket, Transport, Opts).
+
+%% supervisor.
+
+-spec init([]) -> {'ok', {{'simple_one_for_one', 0, 1}, [{
+	any(), {atom() | tuple(), atom(), 'undefined' | [any()]},
+	'permanent' | 'temporary' | 'transient',
+	'brutal_kill' | 'infinity' | non_neg_integer(),
+	'supervisor' | 'worker',
+	'dynamic' | [atom() | tuple()]}]
+}}.
+init([]) ->
+	{ok, {{simple_one_for_one, 0, 1}, [{?MODULE, {?MODULE, start_protocol, []},
+		temporary, brutal_kill, worker, [?MODULE]}]}}.
diff --git a/src/ranch_listener.erl b/src/ranch_listener.erl
new file mode 100644
index 0000000..fbcb87a
--- /dev/null
+++ b/src/ranch_listener.erl
@@ -0,0 +1,224 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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 Public API for managing listeners.
+-module(ranch_listener).
+-behaviour(gen_server).
+
+-export([start_link/2, stop/1,
+	add_connection/4, move_connection/3, remove_connection/2, check_upgrades/2,
+	get_protocol_options/1, set_protocol_options/2]). %% API.
+-export([init/1, handle_call/3, handle_cast/2,
+	handle_info/2, terminate/2, code_change/3]). %% gen_server.
+
+-type pools() :: [{atom(), non_neg_integer()}].
+
+-record(state, {
+	conn_pools = [] :: pools(),
+	conns_table :: ets:tid(),
+	queue = undefined :: queue(),
+	max_conns = undefined :: non_neg_integer(),
+	proto_opts :: any(),
+	proto_opts_vsn = 1 :: non_neg_integer()
+}).
+
+%% API.
+
+%% @private
+%%
+%% We set the process priority to high because ranch_listener is the central
+%% gen_server in Ranch and is used to manage all the incoming connections.
+%% Setting the process priority to high ensures the connection-related code
+%% will always be executed when a connection needs it, allowing Ranch to
+%% scale far beyond what it would with a normal priority.
+-spec start_link(non_neg_integer(), any()) -> {ok, pid()}.
+start_link(MaxConns, ProtoOpts) ->
+	gen_server:start_link(?MODULE, [MaxConns, ProtoOpts],
+		[{spawn_opt, [{priority, high}]}]).
+
+%% @private
+-spec stop(pid()) -> stopped.
+stop(ServerPid) ->
+	gen_server:call(ServerPid, stop).
+
+%% @doc Add a connection to the given pool in the listener.
+%%
+%% Pools of connections are used to restrict the maximum number of connections
+%% depending on their type. By default, Ranch add all connections to the
+%% pool <em>default</em>. It also checks for the maximum number of connections
+%% in that pool before accepting again. This function only returns when there
+%% is free space in the pool.
+%%
+%% When a process managing a connection dies, the process is removed from the
+%% pool. If the socket has been sent to another process, it is up to the
+%% protocol code to inform the listener of the new <em>ConnPid</em> by removing
+%% the previous and adding the new one.
+%%
+%% This function also returns whether the protocol options have been modified.
+%% If so, then an {upgrade, ProtoOpts, OptsVsn} will be returned instead of
+%% the atom 'ok'. The acceptor can then continue with the new protocol options.
+-spec add_connection(pid(), atom(), pid(), non_neg_integer())
+	-> ok | {upgrade, any(), non_neg_integer()}.
+add_connection(ServerPid, Pool, ConnPid, OptsVsn) ->
+	gen_server:call(ServerPid, {add_connection, Pool, ConnPid, OptsVsn},
+		infinity).
+
+%% @doc Move a connection from one pool to another.
+-spec move_connection(pid(), atom(), pid()) -> ok.
+move_connection(ServerPid, DestPool, ConnPid) ->
+	gen_server:cast(ServerPid, {move_connection, DestPool, ConnPid}).
+
+%% @doc Remove the given connection from its pool.
+-spec remove_connection(pid(), pid()) -> ok.
+remove_connection(ServerPid, ConnPid) ->
+	gen_server:cast(ServerPid, {remove_connection, ConnPid}).
+
+%% @doc Return whether a protocol upgrade is required.
+-spec check_upgrades(pid(), non_neg_integer())
+	-> ok | {upgrade, any(), non_neg_integer()}.
+check_upgrades(ServerPid, OptsVsn) ->
+	gen_server:call(ServerPid, {check_upgrades, OptsVsn}).
+
+%% @doc Return the current protocol options.
+-spec get_protocol_options(pid()) -> {ok, any()}.
+get_protocol_options(ServerPid) ->
+	gen_server:call(ServerPid, get_protocol_options).
+
+%% @doc Upgrade the protocol options.
+-spec set_protocol_options(pid(), any()) -> ok.
+set_protocol_options(ServerPid, ProtoOpts) ->
+	gen_server:call(ServerPid, {set_protocol_options, ProtoOpts}).
+
+%% gen_server.
+
+%% @private
+-spec init(list()) -> {ok, #state{}}.
+init([MaxConns, ProtoOpts]) ->
+	ConnsTable = ets:new(connections_table, [set, private]),
+	Queue = queue:new(),
+	{ok, #state{conns_table=ConnsTable, max_conns=MaxConns,
+		proto_opts=ProtoOpts, queue=Queue}}.
+
+%% @private
+-spec handle_call(_, _, State)
+	-> {reply, ignored, State} | {stop, normal, stopped, State}.
+handle_call({add_connection, Pool, ConnPid, AccOptsVsn}, From, State=#state{
+		conn_pools=Pools, conns_table=ConnsTable,
+		queue=Queue, max_conns=MaxConns,
+		proto_opts=ProtoOpts, proto_opts_vsn=LisOptsVsn}) ->
+	{NbConns, Pools2} = add_pid(ConnPid, Pool, Pools, ConnsTable),
+	State2 = State#state{conn_pools=Pools2},
+	if	AccOptsVsn =/= LisOptsVsn ->
+			{reply, {upgrade, ProtoOpts, LisOptsVsn}, State2};
+		NbConns > MaxConns ->
+			Queue2 = queue:in(From, Queue),
+			{noreply, State2#state{queue=Queue2}};
+		true ->
+			{reply, ok, State2}
+	end;
+handle_call({check_upgrades, AccOptsVsn}, _From, State=#state{
+		proto_opts=ProtoOpts, proto_opts_vsn=LisOptsVsn}) ->
+	if	AccOptsVsn =/= LisOptsVsn ->
+			{reply, {upgrade, ProtoOpts, LisOptsVsn}, State};
+		true ->
+			{reply, ok, State}
+	end;
+handle_call(get_protocol_options, _From, State=#state{proto_opts=ProtoOpts}) ->
+	{reply, {ok, ProtoOpts}, State};
+handle_call({set_protocol_options, ProtoOpts}, _From,
+		State=#state{proto_opts_vsn=OptsVsn}) ->
+	{reply, ok, State#state{proto_opts=ProtoOpts, proto_opts_vsn=OptsVsn + 1}};
+handle_call(stop, _From, State) ->
+	{stop, normal, stopped, State};
+handle_call(_, _From, State) ->
+	{reply, ignored, State}.
+
+%% @private
+-spec handle_cast(_, State) -> {noreply, State}.
+handle_cast({move_connection, DestPool, ConnPid}, State=#state{
+		conn_pools=Pools, conns_table=ConnsTable}) ->
+	Pools2 = move_pid(ConnPid, DestPool, Pools, ConnsTable),
+	{noreply, State#state{conn_pools=Pools2}};
+handle_cast({remove_connection, ConnPid}, State=#state{
+		conn_pools=Pools, conns_table=ConnsTable, queue=Queue}) ->
+	{Pools2, Queue2} = remove_pid(ConnPid, Pools, ConnsTable, Queue),
+	{noreply, State#state{conn_pools=Pools2, queue=Queue2}};
+handle_cast(_Msg, State) ->
+	{noreply, State}.
+
+%% @private
+-spec handle_info(_, State) -> {noreply, State}.
+handle_info({'DOWN', _Ref, process, Pid, _Info}, State=#state{
+		conn_pools=Pools, conns_table=ConnsTable, queue=Queue}) ->
+	{Pools2, Queue2} = remove_pid(Pid, Pools, ConnsTable, Queue),
+	{noreply, State#state{conn_pools=Pools2, queue=Queue2}};
+handle_info(_Info, State) ->
+	{noreply, State}.
+
+%% @private
+-spec terminate(_, _) -> ok.
+terminate(_Reason, _State) ->
+	ok.
+
+%% @private
+-spec code_change(_, State, _) -> {ok, State}.
+code_change(_OldVsn, State, _Extra) ->
+	{ok, State}.
+
+%% Internal.
+
+%% @private
+-spec add_pid(pid(), atom(), pools(), ets:tid())
+	-> {non_neg_integer(), pools()}.
+add_pid(ConnPid, Pool, Pools, ConnsTable) ->
+	MonitorRef = erlang:monitor(process, ConnPid),
+	ConnPid ! {shoot, self()},
+	{NbConnsRet, Pools2} = case lists:keyfind(Pool, 1, Pools) of
+		false ->
+			{1, [{Pool, 1}|Pools]};
+		{Pool, NbConns} ->
+			NbConns2 = NbConns + 1,
+			{NbConns2, [{Pool, NbConns2}|lists:keydelete(Pool, 1, Pools)]}
+	end,
+	ets:insert(ConnsTable, {ConnPid, {MonitorRef, Pool}}),
+	{NbConnsRet, Pools2}.
+
+%% @private
+-spec move_pid(pid(), atom(), pools(), ets:tid()) -> pools().
+move_pid(ConnPid, DestPool, Pools, ConnsTable) ->
+	{MonitorRef, SrcPool} = ets:lookup_element(ConnsTable, ConnPid, 2),
+	ets:insert(ConnsTable, {ConnPid, {MonitorRef, DestPool}}),
+	{SrcPool, SrcNbConns} = lists:keyfind(SrcPool, 1, Pools),
+	DestNbConns = case lists:keyfind(DestPool, 1, Pools) of
+		false -> 1;
+		{DestPool, NbConns} -> NbConns + 1
+	end,
+	Pools2 = lists:keydelete(SrcPool, 1, lists:keydelete(DestPool, 1, Pools)),
+	[{SrcPool, SrcNbConns - 1}, {DestPool, DestNbConns}|Pools2].
+
+%% @private
+-spec remove_pid(pid(), pools(), ets:tid(), queue()) -> {pools(), queue()}.
+remove_pid(Pid, Pools, ConnsTable, Queue) ->
+	{MonitorRef, Pool} = ets:lookup_element(ConnsTable, Pid, 2),
+	erlang:demonitor(MonitorRef, [flush]),
+	{Pool, NbConns} = lists:keyfind(Pool, 1, Pools),
+	Pools2 = [{Pool, NbConns - 1}|lists:keydelete(Pool, 1, Pools)],
+	ets:delete(ConnsTable, Pid),
+	case queue:out(Queue) of
+		{{value, Client}, Queue2} ->
+			gen_server:reply(Client, ok),
+			{Pools2, Queue2};
+		_ ->
+			{Pools2, Queue}
+	end.
diff --git a/src/ranch_listener_sup.erl b/src/ranch_listener_sup.erl
new file mode 100644
index 0000000..c33194f
--- /dev/null
+++ b/src/ranch_listener_sup.erl
@@ -0,0 +1,46 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+%% @private
+-module(ranch_listener_sup).
+-behaviour(supervisor).
+
+-export([start_link/5]). %% API.
+-export([init/1]). %% supervisor.
+
+%% API.
+
+-spec start_link(non_neg_integer(), module(), any(), module(), any())
+	-> {ok, pid()}.
+start_link(NbAcceptors, Transport, TransOpts, Protocol, ProtoOpts) ->
+	MaxConns = proplists:get_value(max_connections, TransOpts, 1024),
+	{ok, SupPid} = supervisor:start_link(?MODULE, []),
+	{ok, ListenerPid} = supervisor:start_child(SupPid,
+		{ranch_listener, {ranch_listener, start_link, [MaxConns, ProtoOpts]},
+		 permanent, 5000, worker, [ranch_listener]}),
+	{ok, ConnsPid} = supervisor:start_child(SupPid,
+		{ranch_conns_sup, {ranch_conns_sup, start_link, []},
+		 permanent, 5000, supervisor, [ranch_conns_sup]}),
+	{ok, _PoolPid} = supervisor:start_child(SupPid,
+		{ranch_acceptors_sup, {ranch_acceptors_sup, start_link, [
+			NbAcceptors, Transport, TransOpts,
+			Protocol, ProtoOpts, ListenerPid, ConnsPid
+		]}, permanent, 5000, supervisor, [ranch_acceptors_sup]}),
+	{ok, SupPid}.
+
+%% supervisor.
+
+-spec init([]) -> {ok, {{one_for_all, 10, 10}, []}}.
+init([]) ->
+	{ok, {{one_for_all, 10, 10}, []}}.
diff --git a/src/ranch_ssl.erl b/src/ranch_ssl.erl
new file mode 100644
index 0000000..10cba53
--- /dev/null
+++ b/src/ranch_ssl.erl
@@ -0,0 +1,170 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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 SSL transport API.
+%%
+%% Wrapper around <em>ssl</em> implementing the Ranch transport API.
+%%
+%% This transport requires the <em>crypto</em>, <em>public_key</em>
+%% and <em>ssl</em> applications to be started. If they aren't started,
+%% it will try to start them itself before opening a port to listen.
+%% Applications aren't stopped when the listening socket is closed, though.
+%%
+%% @see ssl
+-module(ranch_ssl).
+-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, <em>ssl</em>.
+-spec name() -> ssl.
+name() -> ssl.
+
+%% @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() -> {ssl, ssl_closed, ssl_error}.
+messages() -> {ssl, ssl_closed, ssl_error}.
+
+%% @doc Setup a socket to listen on the given port on the local host.
+%%
+%% The available options are:
+%% <dl>
+%%  <dt>port</dt><dd>Mandatory. TCP port number to open.</dd>
+%%  <dt>backlog</dt><dd>Maximum length of the pending connections queue.
+%%   Defaults to 1024.</dd>
+%%  <dt>ip</dt><dd>Interface to listen on. Listen on all interfaces
+%%   by default.</dd>
+%%  <dt>certfile</dt><dd>Mandatory. Path to a file containing the user's
+%%   certificate.</dd>
+%%  <dt>keyfile</dt><dd>Optional. Path to the file containing the user's
+%%   private PEM encoded key.</dd>
+%%  <dt>cacertfile</dt><dd>Optional. Path to file containing PEM encoded
+%%   CA certificates (trusted certificates used for verifying a peer
+%%   certificate).</dd>
+%%  <dt>password</dt><dd>Optional. String containing the user's password.
+%%   All private keyfiles must be password protected currently.</dd>
+%%  <dt>ciphers</dt><dd>Optional. The cipher suites that should be supported.
+%%  The function ssl:cipher_suites/0 can be used to find all available
+%%  ciphers.</dd>
+%% </dl>
+%%
+%% @see ssl:listen/2
+-spec listen([{port, inet:port_number()} | {certfile, string()}
+	| {keyfile, string()} | {password, string()}
+	| {cacertfile, string()} | {ip, inet:ip_address()}])
+	-> {ok, ssl:sslsocket()} | {error, atom()}.
+listen(Opts) ->
+	require([crypto, public_key, ssl]),
+	{port, Port} = lists:keyfind(port, 1, Opts),
+	Backlog = proplists:get_value(backlog, Opts, 1024),
+	{certfile, CertFile} = lists:keyfind(certfile, 1, Opts),
+
+	ListenOpts0 = [binary, {active, false},
+		{backlog, Backlog}, {packet, raw}, {reuseaddr, true},
+		{certfile, CertFile}],
+	ListenOpts = lists:foldl(fun
+		({ip, _} = Ip, Acc) -> [Ip | Acc];
+		({keyfile, _} = KeyFile, Acc) -> [KeyFile | Acc];
+		({cacertfile, _} = CACertFile, Acc) -> [CACertFile | Acc];
+		({password, _} = Password, Acc) -> [Password | Acc];
+		({ciphers, _} = Ciphers, Acc) -> [Ciphers | Acc];
+		(_, Acc) -> Acc
+	end, ListenOpts0, Opts),
+	ssl:listen(Port, ListenOpts).
+
+%% @doc Accept an incoming connection on a listen socket.
+%%
+%% Note that this function does both the transport accept and
+%% the SSL handshake.
+%%
+%% @see ssl:transport_accept/2
+%% @see ssl:ssl_accept/2
+-spec accept(ssl:sslsocket(), timeout())
+	-> {ok, ssl:sslsocket()} | {error, closed | timeout | atom()}.
+accept(LSocket, Timeout) ->
+	case ssl:transport_accept(LSocket, Timeout) of
+		{ok, CSocket} ->
+			ssl_accept(CSocket, Timeout);
+		{error, Reason} ->
+			{error, Reason}
+	end.
+
+%% @doc Receive a packet from a socket in passive mode.
+%% @see ssl:recv/3
+-spec recv(ssl:sslsocket(), non_neg_integer(), timeout())
+	-> {ok, any()} | {error, closed | atom()}.
+recv(Socket, Length, Timeout) ->
+	ssl:recv(Socket, Length, Timeout).
+
+%% @doc Send a packet on a socket.
+%% @see ssl:send/2
+-spec send(ssl:sslsocket(), iolist()) -> ok | {error, atom()}.
+send(Socket, Packet) ->
+	ssl:send(Socket, Packet).
+
+%% @doc Set one or more options for a socket.
+%% @see ssl:setopts/2
+-spec setopts(ssl:sslsocket(), list()) -> ok | {error, atom()}.
+setopts(Socket, Opts) ->
+	ssl:setopts(Socket, Opts).
+
+%% @doc Assign a new controlling process <em>Pid</em> to <em>Socket</em>.
+%% @see ssl:controlling_process/2
+-spec controlling_process(ssl:sslsocket(), pid())
+	-> ok | {error, closed | not_owner | atom()}.
+controlling_process(Socket, Pid) ->
+	ssl:controlling_process(Socket, Pid).
+
+%% @doc Return the address and port for the other end of a connection.
+%% @see ssl:peername/1
+-spec peername(ssl:sslsocket())
+	-> {ok, {inet:ip_address(), inet:port_number()}} | {error, atom()}.
+peername(Socket) ->
+	ssl:peername(Socket).
+
+%% @doc Close a TCP socket.
+%% @see ssl:close/1
+-spec close(ssl:sslsocket()) -> ok.
+close(Socket) ->
+	ssl:close(Socket).
+
+%% @doc Get the local address and port of a socket
+%% @see ssl:sockname/1
+-spec sockname(ssl:sslsocket())
+	-> {ok, {inet:ip_address(), inet:port_number()}} | {error, atom()}.
+sockname(Socket) ->
+	ssl:sockname(Socket).
+
+%% Internal.
+
+-spec require(list(module())) -> ok.
+require([]) ->
+	ok;
+require([App|Tail]) ->
+	case application:start(App) of
+		ok -> ok;
+		{error, {already_started, App}} -> ok
+	end,
+	require(Tail).
+
+-spec ssl_accept(ssl:sslsocket(), timeout())
+	-> {ok, ssl:sslsocket()} | {error, closed | timeout | atom()}.
+ssl_accept(Socket, Timeout) ->
+	case ssl:ssl_accept(Socket, Timeout) of
+		ok ->
+			{ok, Socket};
+		{error, Reason} ->
+			{error, Reason}
+	end.
diff --git a/src/ranch_sup.erl b/src/ranch_sup.erl
new file mode 100644
index 0000000..942522d
--- /dev/null
+++ b/src/ranch_sup.erl
@@ -0,0 +1,40 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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.
+
+%% @private
+-module(ranch_sup).
+-behaviour(supervisor).
+
+-export([start_link/0]). %% API.
+-export([init/1]). %% supervisor.
+
+-define(SUPERVISOR, ?MODULE).
+
+%% API.
+
+-spec start_link() -> {ok, pid()}.
+start_link() ->
+	supervisor:start_link({local, ?SUPERVISOR}, ?MODULE, []).
+
+%% supervisor.
+
+-spec init([]) -> {'ok', {{'one_for_one', 10, 10}, [{
+	any(), {atom() | tuple(), atom(), 'undefined' | [any()]},
+	'permanent' | 'temporary' | 'transient',
+	'brutal_kill' | 'infinity' | non_neg_integer(),
+	'supervisor' | 'worker',
+	'dynamic' | [atom() | tuple()]}]
+}}.
+init([]) ->
+	{ok, {{one_for_one, 10, 10}, []}}.
diff --git a/src/ranch_tcp.erl b/src/ranch_tcp.erl
new file mode 100644
index 0000000..5c2a61d
--- /dev/null
+++ b/src/ranch_tcp.erl
@@ -0,0 +1,113 @@
+%% Copyright (c) 2011-2012, Loïc Hoguin <[email protected]>
+%%
+%% 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 <em>gen_tcp</em> implementing the Ranch transport API.
+%%
+%% @see gen_tcp
+-module(ranch_tcp).
+
+-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, <em>tcp</em>.
+-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:
+%% <dl>
+%%  <dt>port</dt><dd>Mandatory. TCP port number to open.</dd>
+%%  <dt>backlog</dt><dd>Maximum length of the pending connections queue.
+%%   Defaults to 1024.</dd>
+%%  <dt>ip</dt><dd>Interface to listen on. Listen on all interfaces
+%%   by default.</dd>
+%% </dl>
+%%
+%% @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 <em>Pid</em> to <em>Socket</em>.
+%% @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).