%% Copyright (c) 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(cowboy_client).
-export([init/1]).
-export([state/1]).
-export([transport/1]).
-export([connect/4]).
-export([raw_request/2]).
-export([request/3]).
-export([request/4]).
-export([request/5]).
-export([response/1]).
-export([response_body/1]).
-export([skip_body/1]).
-export([stream_status/1]).
-export([stream_headers/1]).
-export([stream_header/1]).
-export([stream_body/1]).
-record(client, {
state = wait :: wait | request | response | response_body,
opts = [] :: [any()],
socket = undefined :: undefined | inet:socket(),
transport = undefined :: module(),
timeout = 5000 :: timeout(), %% @todo Configurable.
buffer = <<>> :: binary(),
connection = keepalive :: keepalive | close,
version = {1, 1} :: cowboy_http:version(),
response_body = undefined :: undefined | non_neg_integer()
}).
init(Opts) ->
{ok, #client{opts=Opts}}.
state(#client{state=State}) ->
State.
transport(#client{socket=undefined}) ->
{error, notconnected};
transport(#client{transport=Transport, socket=Socket}) ->
{ok, Transport, Socket}.
connect(Transport, Host, Port, Client)
when is_binary(Host) ->
connect(Transport, binary_to_list(Host), Port, Client);
connect(Transport, Host, Port, Client=#client{state=State, opts=Opts})
when is_atom(Transport), is_list(Host),
is_integer(Port), is_record(Client, client),
State =:= wait ->
{ok, Socket} = Transport:connect(Host, Port, Opts),
{ok, Client#client{state=request, socket=Socket, transport=Transport}}.
raw_request(Data, Client=#client{state=response_body}) ->
{done, Client2} = skip_body(Client),
raw_request(Data, Client2);
raw_request(Data, Client=#client{
state=State, socket=Socket, transport=Transport})
when State =:= request ->
ok = Transport:send(Socket, Data),
{ok, Client}.
request(Method, URL, Client) ->
request(Method, URL, [], <<>>, Client).
request(Method, URL, Headers, Client) ->
request(Method, URL, Headers, <<>>, Client).
request(Method, URL, Headers, Body, Client=#client{state=response_body}) ->
{done, Client2} = skip_body(Client),
request(Method, URL, Headers, Body, Client2);
request(Method, URL, Headers, Body, Client=#client{
state=State, version=Version})
when State =:= wait; State =:= request ->
{Transport, FullHost, Host, Port, Path} = parse_url(URL),
{ok, Client2} = case State of
wait -> connect(Transport, Host, Port, Client);
request -> {ok, Client}
end,
VersionBin = cowboy_http:version_to_binary(Version),
%% @todo do keepalive too, allow override...
Headers2 = [
{<<"host">>, FullHost},
{<<"user-agent">>, <<"Cow">>}
|Headers],
Headers3 = case iolist_size(Body) of
0 -> Headers2;
Length -> [{<<"content-length">>, integer_to_list(Length)}|Headers2]
end,
HeadersData = [[Name, <<": ">>, Value, <<"\r\n">>]
|| {Name, Value} <- Headers3],
Data = [Method, <<" ">>, Path, <<" ">>, VersionBin, <<"\r\n">>,
HeadersData, <<"\r\n">>, Body],
raw_request(Data, Client2).
parse_url(<< "https://", Rest/binary >>) ->
parse_url(Rest, cowboy_ssl_transport);
parse_url(<< "http://", Rest/binary >>) ->
parse_url(Rest, cowboy_tcp_transport);
parse_url(URL) ->
parse_url(URL, cowboy_tcp_transport).
parse_url(URL, Transport) ->
case binary:split(URL, <<"/">>) of
[Peer] ->
{Host, Port} = parse_peer(Peer, Transport),
{Transport, Peer, Host, Port, <<"/">>};
[Peer, Path] ->
{Host, Port} = parse_peer(Peer, Transport),
{Transport, Peer, Host, Port, [<<"/">>, Path]}
end.
parse_peer(Peer, Transport) ->
case binary:split(Peer, <<":">>) of
[Host] when Transport =:= cowboy_tcp_transport ->
{binary_to_list(Host), 80};
[Host] when Transport =:= cowboy_ssl_transport ->
{binary_to_list(Host), 443};
[Host, Port] ->
{binary_to_list(Host), list_to_integer(binary_to_list(Port))}
end.
response(Client=#client{state=response_body}) ->
{done, Client2} = skip_body(Client),
response(Client2);
response(Client=#client{state=request}) ->
case stream_status(Client) of
{ok, Status, _, Client2} ->
case stream_headers(Client2) of
{ok, Headers, Client3} ->
{ok, Status, Headers, Client3};
{error, Reason} ->
{error, Reason}
end;
{error, Reason} ->
{error, Reason}
end.
response_body(Client=#client{state=response_body}) ->
response_body_loop(Client, <<>>).
response_body_loop(Client, Acc) ->
case stream_body(Client) of
{ok, Data, Client2} ->
response_body_loop(Client2, << Acc/binary, Data/binary >>);
{done, Client2} ->
{ok, Acc, Client2}
end.
skip_body(Client=#client{state=response_body}) ->
case stream_body(Client) of
{ok, _, Client2} -> skip_body(Client2);
Done -> Done
end.
stream_status(Client=#client{state=State, buffer=Buffer})
when State =:= request ->
case binary:split(Buffer, <<"\r\n">>) of
[Line, Rest] ->
parse_status(Client#client{state=response, buffer=Rest}, Line);
_ ->
case recv(Client) of
{ok, Data} ->
Buffer2 = << Buffer/binary, Data/binary >>,
stream_status(Client#client{buffer=Buffer2});
{error, Reason} ->
{error, Reason}
end
end.
parse_status(Client, << "HTTP/", High, ".", Low, " ",
S3, S2, S1, " ", StatusStr/binary >>)
when High >= $0, High =< $9, Low >= $0, Low =< $9,
S3 >= $0, S3 =< $9, S2 >= $0, S2 =< $9, S1 >= $0, S1 =< $9 ->
Version = {High - $0, Low - $0},
Status = (S3 - $0) * 100 + (S2 - $0) * 10 + S1 - $0,
{ok, Status, StatusStr, Client#client{version=Version}}.
stream_headers(Client=#client{state=State})
when State =:= response ->
stream_headers(Client, []).
stream_headers(Client, Acc) ->
case stream_header(Client) of
{ok, Name, Value, Client2} ->
stream_headers(Client2, [{Name, Value}|Acc]);
{done, Client2} ->
{ok, Acc, Client2};
{error, Reason} ->
{error, Reason}
end.
stream_header(Client=#client{state=State, buffer=Buffer,
response_body=RespBody}) when State =:= response ->
case binary:split(Buffer, <<"\r\n">>) of
[<<>>, Rest] ->
%% If we have a body, set response_body.
Client2 = case RespBody of
undefined -> Client#client{state=request};
0 -> Client#client{state=request};
_ -> Client#client{state=response_body}
end,
{done, Client2#client{buffer=Rest}};
[Line, Rest] ->
%% @todo Do a better parsing later on.
[Name, Value] = binary:split(Line, <<": ">>),
Name2 = cowboy_bstr:to_lower(Name),
Client2 = case Name2 of
<<"content-length">> ->
Length = list_to_integer(binary_to_list(Value)),
if Length >= 0 -> ok end,
Client#client{response_body=Length};
_ ->
Client
end,
{ok, Name2, Value, Client2#client{buffer=Rest}};
_ ->
case recv(Client) of
{ok, Data} ->
Buffer2 = << Buffer/binary, Data/binary >>,
stream_header(Client#client{buffer=Buffer2});
{error, Reason} ->
{error, Reason}
end
end.
stream_body(Client=#client{state=response_body, response_body=RespBody})
when RespBody =:= undefined; RespBody =:= 0 ->
{done, Client#client{state=request, response_body=undefined}};
stream_body(Client=#client{state=response_body, buffer=Buffer,
response_body=Length}) when is_integer(Length) ->
case byte_size(Buffer) of
0 ->
case recv(Client) of
{ok, Body} when byte_size(Body) =< Length ->
Length2 = Length - byte_size(Body),
{ok, Body, Client#client{response_body=Length2}};
{ok, Data} ->
<< Body:Length/binary, Rest/binary >> = Data,
{ok, Body, Client#client{buffer=Rest,
response_body=undefined}};
{error, Reason} ->
{error, Reason}
end;
N when N =< Length ->
Length2 = Length - N,
{ok, Buffer, Client#client{buffer= <<>>, response_body=Length2}};
_ ->
<< Body:Length/binary, Rest/binary >> = Buffer,
{ok, Body, Client#client{buffer=Rest, response_body=undefined}}
end.
recv(#client{socket=Socket, transport=Transport, timeout=Timeout}) ->
Transport:recv(Socket, 0, Timeout).
