cowboy/src/cowboy.erl

%% Copyright (c) 2011-2014, Loïc Hoguin <essen@ninenines.eu>
%%
%% 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.

-module(cowboy).

-export([start_clear/4]).
-export([start_tls/4]).
-export([stop_listener/1]).
-export([set_env/3]).

%% @todo Detailed opts.
-type opts() :: map().
-export_type([opts/0]).

-type fields() :: [atom()
	| {atom(), cowboy_constraints:constraint() | [cowboy_constraints:constraint()]}
	| {atom(), cowboy_constraints:constraint() | [cowboy_constraints:constraint()], any()}].
-export_type([fields/0]).

-type http_headers() :: #{binary() => iodata()}.
-export_type([http_headers/0]).

-type http_status() :: non_neg_integer() | binary().
-export_type([http_status/0]).

-type http_version() :: 'HTTP/2' | 'HTTP/1.1' | 'HTTP/1.0'.
-export_type([http_version/0]).

%% @todo We should hide NbAcceptors in a socket variable, even if Ranch
%% doesn't let us do that yet.
-spec start_clear(ranch:ref(), non_neg_integer(), ranch_tcp:opts(), opts())
	-> {ok, pid()} | {error, any()}.
start_clear(Ref, NbAcceptors, TransOpts0, ProtoOpts)
		when is_integer(NbAcceptors), NbAcceptors > 0 ->
	TransOpts = [connection_type(ProtoOpts)|TransOpts0],
	ranch:start_listener(Ref, NbAcceptors, ranch_tcp, TransOpts, cowboy_clear, ProtoOpts).

-spec start_tls(ranch:ref(), non_neg_integer(), ranch_ssl:opts(), opts())
	-> {ok, pid()} | {error, any()}.
start_tls(Ref, NbAcceptors, TransOpts0, ProtoOpts)
		when is_integer(NbAcceptors), NbAcceptors > 0 ->
	TransOpts = [
		connection_type(ProtoOpts),
		{next_protocols_advertised, [<<"h2">>, <<"http/1.1">>]},
		{alpn_preferred_protocols, [<<"h2">>, <<"http/1.1">>]}
	|TransOpts0],
	ranch:start_listener(Ref, NbAcceptors, ranch_ssl, TransOpts, cowboy_tls, ProtoOpts).

-spec connection_type(opts()) -> {connection_type, worker | supervisor}.
connection_type(ProtoOpts) ->
	{_, Type} = maps:get(stream_handler, ProtoOpts, {cowboy_stream_h, supervisor}),
	{connection_type, Type}.

-spec stop_listener(ranch:ref()) -> ok | {error, not_found}.
stop_listener(Ref) ->
	ranch:stop_listener(Ref).

-spec set_env(ranch:ref(), atom(), any()) -> ok.
set_env(Ref, Name, Value) ->
	Opts = ranch:get_protocol_options(Ref),
	{_, Env} = lists:keyfind(env, 1, Opts),
	Opts2 = lists:keyreplace(env, 1, Opts,
		{env, lists:keystore(Name, 1, Env, {Name, Value})}),
	ok = ranch:set_protocol_options(Ref, Opts2).