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replace gen_server and fsm with gen_lockstep behaviour and callback api
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%% Copyright (c) 2011 | ||
%% Orion Henry <orion@heroku.com> | ||
%% Jacob Vorreuter <jacob.vorreuter@gmail.com> | ||
%% | ||
%% Permission is hereby granted, free of charge, to any person | ||
%% obtaining a copy of this software and associated documentation | ||
%% files (the "Software"), to deal in the Software without | ||
%% restriction, including without limitation the rights to use, | ||
%% copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
%% copies of the Software, and to permit persons to whom the | ||
%% Software is furnished to do so, subject to the following | ||
%% conditions: | ||
%% | ||
%% The above copyright notice and this permission notice shall be | ||
%% included in all copies or substantial portions of the Software. | ||
%% | ||
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
%% EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | ||
%% OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
%% NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | ||
%% HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
%% WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
%% FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
%% OTHER DEALINGS IN THE SOFTWARE. | ||
-module(gen_lockstep). | ||
-behaviour(gen_server). | ||
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%% API | ||
-export([start_link/3]). | ||
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%% Behavior callbacks | ||
-export([behaviour_info/1]). | ||
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%% gen_server callbacks | ||
-export([init/1, | ||
handle_call/3, | ||
handle_cast/2, | ||
handle_info/2, | ||
terminate/2, | ||
code_change/3]). | ||
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%% @hidden | ||
behaviour_info(callbacks) -> | ||
[{init, 1}, | ||
{handle_msg, 2}, | ||
{terminate, 2}]; | ||
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behaviour_info(_) -> | ||
undefined. | ||
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-record(state, {uri, cb_state, cb_mod, seq_num, sock, sock_mod, encoding, buffer}). | ||
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%%==================================================================== | ||
%% API functions | ||
%%==================================================================== | ||
-spec start_link(atom(), list(), [any()]) -> ok | ignore | {error, any()}. | ||
start_link(CallbackModule, LockstepUrl, InitParams) -> | ||
gen_server:start_link(?MODULE, [CallbackModule, LockstepUrl, InitParams], [{fullsweep_after, 0}]). | ||
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%%==================================================================== | ||
%% gen_server callbacks | ||
%%==================================================================== | ||
init([Callback, LockstepUrl, InitParams]) -> | ||
process_flag(trap_exit, true), | ||
case http_uri:parse(LockstepUrl) of | ||
{error, Err} -> | ||
{stop, {error, Err}, undefined}; | ||
Uri -> | ||
case catch Callback:init(InitParams) of | ||
{ok, SeqNum, CbState} -> | ||
State = #state{ | ||
cb_state = CbState, | ||
cb_mod = Callback, | ||
seq_num = SeqNum, | ||
uri = Uri, | ||
buffer = <<>> | ||
}, | ||
{ok, State, 0}; | ||
{stop, Err} -> | ||
{stop, Err}; | ||
{'EXIT', Err} -> | ||
{stop, Err} | ||
end | ||
end. | ||
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handle_call(_Message, _From, State) -> | ||
{reply, error, State}. | ||
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handle_cast(_Message, State) -> | ||
{noreply, State}. | ||
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handle_info({Proto, Sock, {http_response, _Vsn, Status, _}}, #state{sock_mod=Mod, cb_mod=Callback}=State) when Proto == tcp; Proto == ssl -> | ||
case Status >= 200 andalso Status < 300 of | ||
true -> | ||
Mod:setopts(Sock, [{active, once}]), | ||
{noreply, State}; | ||
false -> | ||
catch Callback:terminate({http_status, Status}, State#state.cb_state), | ||
{stop, {http_status, Status}, State} | ||
end; | ||
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handle_info({Proto, Sock, {http_header, _, Key, _, Val}}, #state{sock_mod=Mod}=State) when Proto == tcp; Proto == ssl -> | ||
Mod:setopts(Sock, [{active, once}]), | ||
case [Key, Val] of | ||
['Transfer-Encoding', <<"chunked">>] -> | ||
{noreply, State#state{encoding=chunked}}; | ||
_ -> | ||
{noreply, State} | ||
end; | ||
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handle_info({Proto, Sock, http_eoh}, #state{cb_mod=Callback, sock=Sock, sock_mod=Mod, encoding=Enc}=State) when Proto == tcp; Proto == ssl -> | ||
case Enc of | ||
chunked -> | ||
Mod:setopts(Sock, [{active, once}, {packet, raw}]), | ||
{noreply, State}; | ||
_ -> | ||
catch Callback:terminate({error, expected_chunked_encoding}, State#state.cb_state), | ||
{stop, {error, expected_chunked_encoding}, State} | ||
end; | ||
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handle_info({Proto, Sock, Data}, #state{cb_mod=Callback, sock_mod=Mod, buffer=Buffer}=State) when Proto == tcp; Proto == ssl -> | ||
case parse_msgs(<<Buffer/binary, Data/binary>>, Callback, State#state.cb_state) of | ||
{ok, CbState, Rest} -> | ||
Mod:setopts(Sock, [{active, once}]), | ||
{noreply, State#state{cb_state=CbState, buffer=Rest}}; | ||
{Err, CbState} -> | ||
catch Callback:terminate(Err, CbState), | ||
{stop, Err, State} | ||
end; | ||
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handle_info({Closed, _Sock}, #state{cb_mod=Callback}=State) when Closed == tcp_closed; Closed == ssl_closed -> | ||
catch Callback:terminate({error, closed}, State#state.cb_state), | ||
{stop, {error, closed}, State}; | ||
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handle_info({Err, _Sock, Reason}, #state{cb_mod=Callback}=State) when Err == tcp_error; Err == ssl_error -> | ||
catch Callback:terminate({error, Reason}, State#state.cb_state), | ||
{stop, {error, Reason}, State}; | ||
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handle_info(timeout, #state{uri=Uri, seq_num=SeqNum, cb_mod=Callback, cb_state=CbState}=State) -> | ||
case connect(Uri) of | ||
{ok, Mod, Sock} -> | ||
case send_req(Sock, Mod, Uri, SeqNum, Callback, CbState) of | ||
{ok, CbState1} -> | ||
{noreply, State#state{sock=Sock, sock_mod=Mod, cb_state=CbState1}}; | ||
{Err, CbState1} -> | ||
catch Callback:terminate(Err, CbState1), | ||
{stop, Err, State} | ||
end; | ||
Err -> | ||
catch Callback:terminate(Err, State#state.cb_state), | ||
{stop, Err, State} | ||
end; | ||
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handle_info(_Message, State) -> | ||
{noreply, State}. | ||
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terminate(_Reason, _State) -> | ||
ok. | ||
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code_change(_OldVersion, State, _Extra) -> | ||
{ok, State}. | ||
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%% Internal functions | ||
connect({Proto, _Pass, Host, Port, _Path, _}) -> | ||
Opts = [binary, {packet, http_bin}, {packet_size, 1024 * 1024}, {recbuf, 1024 * 1024}, {active, once}], | ||
case gen_tcp:connect(Host, Port, Opts, 5000) of | ||
{ok, Sock} -> | ||
case ssl_upgrade(Proto, Sock) of | ||
{ok, Mod, Sock1} -> | ||
{ok, Mod, Sock1}; | ||
Err -> | ||
Err | ||
end; | ||
Err -> | ||
Err | ||
end. | ||
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ssl_upgrade(https, Sock) -> | ||
case ssl:connect(Sock, []) of | ||
{ok, SslSock} -> | ||
{ok, ssl, SslSock}; | ||
Err -> | ||
Err | ||
end; | ||
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ssl_upgrade(http, Sock) -> | ||
{ok, gen_tcp, Sock}. | ||
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req(Pass, Host, Path, SeqNum) -> | ||
iolist_to_binary([ | ||
<<"GET ">>, Path, qs(SeqNum), <<" HTTP/1.1\r\n">>, | ||
authorization(Pass), | ||
<<"Host: ">>, Host ,<<"\r\n\r\n">> | ||
]). | ||
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qs(0) -> ""; | ||
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qs(SeqNum) -> | ||
[<<"?update=true&since=">>, SeqNum]. | ||
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authorization([]) -> []; | ||
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authorization(UserPass) -> | ||
Auth = | ||
case string:tokens(UserPass, ":") of | ||
[User] -> base64:encode(User ++ ":"); | ||
[User, Pass] -> base64:encode(User ++ ":" ++ Pass) | ||
end, | ||
[<<"Authorization: Basic ">>, Auth, <<"\r\n">>]. | ||
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send_req(Sock, Mod, {_Proto, Pass, Host, _Port, Path, _}, SeqNum, Callback, CbState) -> | ||
Req = req(Pass, Host, Path, integer_to_list(SeqNum)), | ||
case catch Callback:handle_msg({connect, Req}, CbState) of | ||
{noreply, CbState1} -> | ||
case Mod:send(Sock, Req) of | ||
ok -> | ||
{ok, CbState1}; | ||
Err -> | ||
{Err, CbState1} | ||
end; | ||
{stop, Reason, CbState1} -> | ||
{Reason, CbState1}; | ||
{'EXIT', Err} -> | ||
{Err, CbState} | ||
end. | ||
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parse_msgs(<<>>, _Callback, CbState) -> | ||
{ok, CbState, <<>>}; | ||
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parse_msgs(Data, Callback, CbState) -> | ||
case read_size(Data) of | ||
{ok, Size, Rest} -> | ||
case read_chunk(Rest, Size) of | ||
{ok, <<"\r\n">>, Rest1} -> | ||
parse_msgs(Rest1, Callback, CbState); | ||
{ok, Chunk, Rest1} -> | ||
case (catch mochijson2:decode(Chunk)) of | ||
{struct, Props} -> | ||
case catch Callback:handle_msg({msg, Props}, CbState) of | ||
{noreply, CbState1} -> | ||
parse_msgs(Rest1, Callback, CbState1); | ||
{stop, Reason, CbState1} -> | ||
{Reason, CbState1}; | ||
{'EXIT', Err} -> | ||
{Err, CbState} | ||
end; | ||
{'EXIT', Err} -> | ||
{Err, CbState}; | ||
Err -> | ||
{Err, CbState} | ||
end; | ||
eof -> | ||
{ok, CbState, Data}; | ||
Err -> | ||
{Err, CbState} | ||
end; | ||
eof -> | ||
{ok, CbState, Data}; | ||
Err -> | ||
{Err, CbState} | ||
end. | ||
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read_size(Data) -> | ||
case read_size(Data, [], true) of | ||
{ok, Line, Rest} -> | ||
case io_lib:fread("~16u", Line) of | ||
{ok, [Size], []} -> | ||
{ok, Size, Rest}; | ||
_ -> | ||
{error, {poorly_formatted_size, Line}} | ||
end; | ||
Err -> | ||
Err | ||
end. | ||
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read_size(<<>>, _, _) -> | ||
eof; | ||
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read_size(<<"\r\n", Rest/binary>>, Acc, _) -> | ||
{ok, lists:reverse(Acc), Rest}; | ||
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read_size(<<$;, Rest/binary>>, Acc, _) -> | ||
read_size(Rest, Acc, false); | ||
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read_size(<<C, Rest/binary>>, Acc, AddToAcc) -> | ||
case AddToAcc of | ||
true -> | ||
read_size(Rest, [C|Acc], AddToAcc); | ||
false -> | ||
read_size(Rest, Acc, AddToAcc) | ||
end. | ||
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read_chunk(Data, Size) -> | ||
case Data of | ||
<<Chunk:Size/binary, "\r\n", Rest/binary>> -> | ||
{ok, Chunk, Rest}; | ||
_ -> | ||
eof | ||
end. | ||
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|
@@ -8,6 +8,7 @@ | |
stdlib, | ||
sasl, | ||
crypto, | ||
public_key | ||
public_key, | ||
ssl | ||
]} | ||
]}. |
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