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‎.gitignore

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ebin/

‎LICENSE

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Copyright (c) 2012, Grzegorz Junka
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

‎README.md

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charreada
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=========
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Simple Erlang reverse proxy leveraging Cowboy

‎priv/app.config

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% -*- mode: erlang -*-
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[{charreada,
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[{nb_acceptors, 50},
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{port, 8088}
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]
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}
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].

‎rebar.config

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%% -*- mode: erlang -*-
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{deps,
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[
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{cowboy, ".*", {git, "git://github.com/extend/cowboy.git", "master"}},
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{ibrowse, ".*", {git, "git://github.com/cmullaparthi/ibrowse.git", "master"}}
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]
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}.

‎src/charreada.app.src

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{application, charreada,
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[
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{description, "Simple Erlang reverse proxy leveraging Cowboy"},
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{vsn, "0.1.0"},
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{applications, [kernel, stdlib, cowboy, ibrowse]},
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{registered, [charreada_config]},
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{mod, {charreada_app, []}}
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]
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}.

‎src/charreada.erl

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-module(charreada).
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%% API
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-export([start_http_proxy/3, stop_proxy/0]).
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start_http_proxy(NbAcceptors, TransOpts, Timeout) ->
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Dispatch = [{'_', [ {'_', charreada_handler, []} ]} ],
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Fun = fun(Req) -> charreada_handler:onrequest(Req, Timeout) end,
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ProtoOpts = [ {dispatch, Dispatch}, {onrequest, Fun} ],
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{ok, _} = cowboy:start_http(http, NbAcceptors, TransOpts, ProtoOpts),
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ok.
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stop_proxy() ->
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ok = cowboy:stop_listener(http),
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ok.

‎src/charreada_app.erl

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-module(charreada_app).
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-behaviour(application).
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%% API.
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-export([start/2, stop/1]).
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%% API.
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start(_Type, _Args) ->
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NbAcceptors = get_nb_acceptors(application:get_env(nb_acceptors)),
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Port = get_port(application:get_env(port)),
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Timeout = get_timeout(application:get_env(timeout_seconds)),
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charreada:start_http_proxy(NbAcceptors, [{port, Port}], Timeout),
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charreada_sup:start_link().
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stop(_State) ->
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charreada:stop_proxy(),
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ok.
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get_nb_acceptors(undefined) -> 100;
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get_nb_acceptors({ok, Value}) -> Value.
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get_port(undefined) -> 8080;
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get_port({ok, Value}) -> Value.
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get_timeout(undefined) -> 30*1000;
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get_timeout({ok, Value}) -> Value*1000.

‎src/charreada_config.erl

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-module(charreada_config).
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-behaviour(gen_server).
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%% API
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-export([start_link/1]).
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-export([add_proxy/1, remove_proxy/1, redirect_req/6]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
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%% Internal functions
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-export([wait_for_connect/6]).
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-define(SERVER, ?MODULE).
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%%% API
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start_link(Tid) ->
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gen_server:start_link({local, ?SERVER}, ?MODULE, Tid, []).
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-spec add_proxy ({atom(), term()}) -> ok; ({binary(), term()}) -> ok.
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add_proxy(Proxy) ->
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gen_server:cast(?SERVER, {add, Proxy}).
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-spec remove_proxy (atom()) -> ok; (binary()) -> ok.
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remove_proxy(Name) ->
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gen_server:cast(?SERVER, {remove, Name}).
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-spec redirect_req(
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binary(), binary(), binary(), [{binary(), binary()}], function(), timeout()) ->
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ok | {error, cowboy_http:status()}.
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redirect_req(Method, Host, Path, Headers, BodyFun, Timeout) ->
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Msg = {redirect, self(), Method, Host, Path, Headers, BodyFun, Timeout},
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gen_server:call(?SERVER, Msg).
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%%% gen_server callbacks
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init(Tid) ->
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{ok, Tid}.
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handle_call({redirect, Pid, Method, Host, Path, Headers, BodyFun, Timeout}, _From, Tid) ->
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Proxy = match_host(Tid, binary:split(Host, <<".">>)),
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Reply = start_redirect(Proxy, Pid, Method, Path, Headers, BodyFun, Timeout),
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{reply, Reply, Tid}.
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handle_cast({add, Proxy}, Tid) ->
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ets:insert(Tid, normalize(Proxy)),
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{noreply, Tid};
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handle_cast({remove, Name}, Tid) ->
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ets:delete(Tid, normalize_key(Name)),
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{noreply, Tid}.
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handle_info(_, State) ->
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{noreply, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%% Internal methods
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normalize({Name, Transport, Host, Port, User, Password}) ->
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{to_lower_binary(Name), Transport, Host, Port, User, Password}.
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normalize_key(Name) ->
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to_lower_binary(Name).
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match_host(Tid, [Subdomain | _T]) ->
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ets:lookup(Tid, to_lower_binary(Subdomain));
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match_host(_Tid, []) ->
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[].
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start_redirect([], _Pid, _Method, _Path, _Headers, _BodyFun, _Timeout) ->
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{error, 404};
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start_redirect([{_, Transport, Host, Port, User, Password}],
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Pid, OrgMethod, Path, OrgHeaders, BodyFun, Timeout) ->
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Url = url(Transport, Host, Port, Path),
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Headers = to_strings(OrgHeaders, []),
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Method = to_atom(OrgMethod),
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Options = to_ibrowse_options(Pid, User, Password),
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Params = [Url, Headers, Method, BodyFun, Options, Timeout],
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proc_lib:spawn(?MODULE, wait_for_connect, Params),
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ok.
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wait_for_connect(Url, Headers, Method, BodyFun, Options, Timeout) ->
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ibrowse:send_req(Url, Headers, Method, BodyFun, Options, Timeout).
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url(Transport, Host, Port, Path) ->
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to_string(Transport) ++ "://" ++ to_string(Host) ++ ":" ++ to_string(Port) ++ to_string(Path).
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to_lower_binary(Value) when is_binary(Value) ->
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list_to_binary(string:to_lower(binary_to_list(Value)));
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to_lower_binary(Value) when is_atom(Value) ->
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list_to_binary(string:to_lower(atom_to_list(Value)));
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to_lower_binary(Value) when is_list(Value) ->
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list_to_binary(string:to_lower(Value)).
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to_string(Value) when is_binary(Value) ->
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binary_to_list(Value);
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to_string(Value) when is_atom(Value) ->
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atom_to_list(Value);
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to_string(Value) when is_integer(Value) ->
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integer_to_list(Value);
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to_string({IP1, IP2, IP3, IP4}) ->
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to_string(IP1) ++ "." ++ to_string(IP2) ++ "." ++ to_string(IP3) ++ "." ++ to_string(IP4).
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to_atom(<<"GET">>) -> get;
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to_atom(<<"POST">>) -> post;
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to_atom(<<"HEAD">>) -> head;
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to_atom(<<"OPTIONS">>) -> options;
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to_atom(<<"PUT">>) -> put;
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to_atom(<<"DELETE">>) -> delete;
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to_atom(<<"TRACE">>) -> trace;
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to_atom(<<"MKCOL">>) -> mkcol;
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to_atom(<<"PROPFIND">>) -> propfind;
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to_atom(<<"PROPPATCH">>) -> proppatch;
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to_atom(<<"LOCK">>) -> lock;
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to_atom(<<"UNLOCK">>) -> unlock;
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to_atom(<<"MOVE">>) -> move;
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to_atom(<<"COPY">>) -> copy.
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to_strings([{Key, Value}|T], Acc) ->
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to_strings(T, [{to_string(Key), to_string(Value)}|Acc]);
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to_strings([], Acc) ->
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lists:reverse(Acc).
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to_ibrowse_options(Pid, undefined, _Password) ->
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to_ibrowse_options([], Pid);
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to_ibrowse_options(Pid, _User, undefined) ->
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to_ibrowse_options([], Pid);
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to_ibrowse_options(Pid, User, Password) ->
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to_ibrowse_options([{basic_auth, {to_string(User), to_string(Password)}}], Pid).
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to_ibrowse_options(Acc, Pid) ->
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[{stream_to, {Pid, once}}|Acc].

‎src/charreada_handler.erl

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-module(charreada_handler).
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%% Cowboy handler
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-export([onrequest/2]).
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-export([init/3]).
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-export([info/3]).
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-export([terminate/2]).
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onrequest(Req, Timeout) ->
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proxy_host(cowboy_req:header(<<"host">>, Req), Timeout).
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proxy_host({undefined, Req}, _Timeout) ->
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{ok, ReplyReq} = cowboy_req:reply(404, Req),
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ReplyReq;
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proxy_host({Host, Req}, Timeout) ->
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{Method, Req} = cowboy_req:method(Req),
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{Path, Req} = cowboy_req:path(Req),
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{OrgHeaders, Req} = cowboy_req:headers(Req),
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Headers = lists:keydelete(<<"host">>, 1, OrgHeaders),
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BodyFun = {fun post_body/1, self()},
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Resp = charreada_config:redirect_req(Method, Host, Path, Headers, BodyFun, Timeout),
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handle_redirect(Resp, Req, Timeout).
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handle_redirect(ok, Req, Timeout) ->
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cowboy_req:set_meta(timeout, Timeout, Req);
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handle_redirect({error, Status}, Req, _Timeout) ->
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{ok, ReplyReq} = cowboy_req:reply(Status, Req),
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ReplyReq.
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init(_Transport, OrgReq, []) ->
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{Timeout, Req} = cowboy_req:meta(timeout, OrgReq),
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{loop, Req, {Timeout, undefined}, Timeout}.
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info({ibrowse_get_body, Pid}, Req, State) ->
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stream(cowboy_req:stream_body(Req), Req, Pid, State);
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info({ibrowse_async_headers, RequestId, Code, HeadersOrg}, Req, {Timeout, undefined}) ->
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{Headers, Length} = process_headers(HeadersOrg, [], 0),
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{ok, Transport, Socket} = cowboy_req:transport(Req),
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Fun = fun() -> stream_reply({RequestId, Transport, Socket, Length}, Length) end,
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{ok, ReplyReq} = cowboy_req:reply(list_to_integer(Code), Headers, {Length, Fun}, Req),
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{loop, ReplyReq, {Timeout, Length}};
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info({ibrowse_async_response, _RequestId, []}, Req, State) ->
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{loop, Req, State};
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info({ibrowse_async_response_end, _RequestId}, Req, State) ->
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{ok, Req, State};
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info({cowboy_req, resp_sent}, Req, State) ->
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{loop, Req, State};
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info({error, _Reason}, Req, State) ->
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reply(502, Req, State).
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terminate(_Req, _State) ->
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ok.
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post_body(Pid) ->
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Pid ! {ibrowse_get_body, self()},
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receive
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{ok, Data} ->
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{ok, Data, Pid};
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eof ->
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eof
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end.
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stream({done, Req}, _Req, Pid, State) ->
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Pid ! eof,
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{loop, Req, State};
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stream({ok, Data, Req}, _Req, Pid, State) ->
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Pid ! {ok, Data},
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{loop, Req, State};
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stream({error, _Reason}, Req, Pid, State) ->
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Pid ! eof,
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reply(502, Req, State).
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process_headers([{Key, Value}|T], Acc, Length) ->
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BKey = list_to_binary(string:to_lower(Key)),
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process_headers(BKey, Value, T, Acc, Length);
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process_headers([], Acc, Length) ->
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{lists:reverse(Acc), Length}.
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process_headers(<<"content-length">>, Value, Headers, Acc, _Length) ->
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process_headers(Headers, Acc, list_to_integer(Value));
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process_headers(Key, Value, Headers, Acc, Length) ->
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process_headers(Headers, [{Key, Value}|Acc], Length).
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stream_reply({RequestId, Transport, Socket, _Length} = ReqInfo, ToSend) ->
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ibrowse:stream_next(RequestId),
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receive
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{ibrowse_async_response, RequestId, Data} ->
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ChunkLength = length(Data),
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Result = Transport:send(Socket, Data),
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check_send(Result, ReqInfo, ToSend, ChunkLength)
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end.
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check_send(ok, ReqInfo, ToSend, ChunkLength) ->
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check_send(ReqInfo, ToSend - ChunkLength);
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check_send({error, _}, {RequestId, Transport, Socket, Length}, ToSend, _ChunkLength) ->
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ibrowse:stream_close(RequestId),
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Transport:close(Socket),
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{sent, Length - ToSend}.
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check_send({_RequestId, _Transport, _Socket, Length}, ToSend) when ToSend =< 0 ->
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{sent, Length};
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check_send(ReqInfo, ToSend) ->
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stream_reply(ReqInfo, ToSend).
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reply({ok, Req}, State) ->
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{ok, Req, State}.
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reply(Code, Req, State) ->
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reply(cowboy_req:reply(Code, Req), State).

‎src/charreada_sup.erl

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-module(charreada_sup).
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-behaviour(supervisor).
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%% API.
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-export([start_link/0]).
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%% Supervisor callbacks
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-export([init/1]).
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%% Helper macro for declaring supervisor worker
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-define(WORKER(I, P), {I, {I, start_link, [P]}, permanent, 5000, worker, [I]}).
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%% API
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start_link() ->
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supervisor:start_link(?MODULE, []).
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%% Supervisor callbacks
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init([]) ->
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Tid = ets:new(?MODULE, [public, {read_concurrency, true}]),
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Procs = [?WORKER(charreada_config, Tid)],
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{ok, {{one_for_one, 5, 15}, Procs}}.

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