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hackney_stream.erl
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hackney_stream.erl
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%%% -*- erlang -*-
%%%
%%% This file is part of hackney released under the Apache 2 license.
%%% See the NOTICE for more information.
%%%
-module(hackney_stream).
-export([start_link/3]).
%% internal
-export([async_recv/5, maybe_continue/4]).
-export([init/4,
system_continue/3,
system_terminate/4,
system_code_change/4]).
-include("hackney.hrl").
-include_lib("hackney_internal.hrl").
start_link(Owner, Ref, Client) ->
proc_lib:start_link(?MODULE, init, [self(), Owner, Ref, Client]).
init(Parent, Owner, Ref, Client) ->
%% register the stream
ok = proc_lib:init_ack(Parent, {ok, self()}),
ok = wait_for_controlling_process(),
_MRef = erlang:monitor(process, Owner),
Parser = hackney_http:parser([response]),
try
stream_loop(Parent, Owner, Ref, Client#client{parser=Parser,
response_state=on_status})
catch _:Reason ->
Owner ! {hackney_response, Ref, {error, {unknown_error, Reason}}}
end.
wait_for_controlling_process() ->
receive
controlling_process_done ->
ok
after 10000 ->
timeout
end.
stream_loop(Parent, Owner, Ref, #client{transport=Transport,
socket=Socket,
response_state=on_body,
method= <<"HEAD">>,
parser=Parser}=Client) ->
Buffer = hackney_http:get(Parser, buffer),
hackney_manager:store_state(finish_response(Buffer, Client)),
%% remove ant message in the socket
_ = flush(Transport, Socket),
%% pass the control of the socket to the manager so we make
%% sure a new request will be able to use it
Transport:controlling_process(Socket, Parent),
%% tell the client we are done
Owner ! {hackney_response, Ref, done};
stream_loop(Parent, Owner, Ref, #client{transport=Transport,
socket=Socket,
response_state=on_body,
clen=0, te=TE,
parser=Parser}=Client)
when TE /= <<"chunked">> ->
Buffer = hackney_http:get(Parser, buffer),
hackney_manager:store_state(finish_response(Buffer, Client)),
%% remove ant message in the socket
_ = flush(Transport, Socket),
%% pass the control of the socket to the manager so we make
%% sure a new request will be able to use it
Transport:controlling_process(Socket, Parent),
%% tell the client we are done
Owner ! {hackney_response, Ref, done};
stream_loop(Parent, Owner, Ref, #client{transport=Transport,
socket=Socket}=Client) ->
case parse(Client) of
{loop, Client2} ->
stream_loop(Parent, Owner, Ref, Client2);
{more, Client2, Rest} ->
async_recv(Parent, Owner, Ref, Client2, Rest);
{ok, StatusInt, Reason, Client2} ->
maybe_redirect(Parent, Owner, Ref, StatusInt, Reason,
Client2);
{ok, {headers, Headers}, Client2} ->
Owner ! {hackney_response, Ref, {headers, Headers}},
maybe_continue(Parent, Owner, Ref, Client2);
{ok, Data, Client2} ->
Owner ! {hackney_response, Ref, Data},
maybe_continue(Parent, Owner, Ref, Client2);
done ->
%% remove ant message in the socket
_ = flush(Transport, Socket),
%% pass the control of the socket to the manager so we make
%% sure a new request will be able to use it
Transport:controlling_process(Socket, Parent),
Owner ! {hackney_response, Ref, done};
{error, _Reason} = Error ->
Owner ! {hackney_response, Ref, Error},
hackney_manager:handle_error(Client)
end.
maybe_continue(Parent, Owner, Ref, #client{transport=Transport,
socket=Socket,
async=true}=Client) ->
receive
{Ref, resume} ->
stream_loop(Parent, Owner, Ref, Client);
{Ref, pause} ->
Transport:setopts(Socket, [{active, false}]),
proc_lib:hibernate(?MODULE, maybe_continue, [Parent, Owner, Ref,
Client]);
{Ref, stop_async, From} ->
hackney_manager:store_state(Client#client{async=false}),
Transport:setopts(Socket, [{active, false}]),
Transport:controlling_process(Socket, From),
From ! {Ref, ok};
{Ref, close} ->
hackney_response:close(Client);
{'DOWN', _MRef, process, Owner, Reason} ->
exit({owner_down, Owner, Reason});
{system, From, Request} ->
sys:handle_system_msg(Request, From, Parent, ?MODULE, [],
{stream_loop, Parent, Owner, Ref, Client});
Else ->
?report_trace("stream: unexpected message", [{message, Else}]),
error_logger:error_msg("Unexpected message: ~w~n", [Else])
after 0 ->
stream_loop(Parent, Owner, Ref, Client)
end;
maybe_continue(Parent, Owner, Ref, #client{transport=Transport,
socket=Socket,
async=once}=Client) ->
receive
{Ref, stream_next} ->
stream_loop(Parent, Owner, Ref, Client);
{Ref, stop_async, From} ->
hackney_manager:store_state(Client),
Transport:setopts(Socket, [{active, false}]),
Transport:controlling_process(Socket, From),
From ! {Ref, ok};
{Ref, close} ->
hackney_response:close(Client);
{'DOWN', _MRef, process, Owner, Reason} ->
exit({owner_down, Owner, Reason});
{system, From, Request} ->
sys:handle_system_msg(Request, From, Parent, ?MODULE, [],
{maybe_continue, Parent, Owner, Ref,
Client});
Else ->
?report_trace("stream: unexpected message", [{message, Else}]),
error_logger:error_msg("Unexpected message: ~w~n", [Else])
after 5000 ->
Transport:setopts(Socket, [{active, false}]),
proc_lib:hibernate(?MODULE, maybe_continue, [Parent, Owner, Ref,
Client])
end.
%% if follow_redirect is true, we are parsing the headers to fetch the
%% location. If we can still redirect, send a message with the location
%% to the receiver so he can eventually start a new request.
%%
%% redirect messages:
%% - {redirect, To, Headers}
%% - {see_other, To, Headers} for status 303 and POST requests.
maybe_redirect(Parent, Owner, Ref, StatusInt, Reason,
#client{method=Method, follow_redirect=true}=Client) ->
case lists:member(StatusInt, [301, 302, 307, 308]) of
true ->
maybe_redirect_1(Parent, Owner, Ref, Reason, Client);
false when StatusInt =:= 303, Method =:= <<"POST">> ->
maybe_redirect_2(Parent, Owner, Ref, Reason, Client);
_ ->
Owner ! {hackney_response, Ref, {status, StatusInt, Reason}},
maybe_continue(Parent, Owner, Ref, Client)
end;
maybe_redirect(Parent, Owner, Ref, StatusInt, Reason, Client) ->
Owner ! {hackney_response, Ref, {status, StatusInt, Reason}},
maybe_continue(Parent, Owner, Ref, Client).
%% The first case for redirections are status codes 301, 302, 307 and 308.
%% In this case {redirect, Location, Headers} is sent to the owner if
%% the request is valid.
maybe_redirect_1(Parent, Owner, Ref, Reason,
#client{transport=Transport, socket=Socket}=Client) ->
Transport:setopts(Socket, [{active, false}]),
case parse(Client) of
{loop, Client2} ->
maybe_redirect_1(Parent, Owner, Ref, Reason, Client2);
{more, Client2, Rest} ->
Continuation = fun(Client3) ->
maybe_redirect_1(Parent, Owner, Ref, Reason, Client3)
end,
async_recv(Parent, Owner, Ref, Client2, Rest, Continuation);
{ok, {headers, Headers}, Client2} ->
Location = hackney:redirect_location(Headers),
case Location of
undefined ->
Owner ! {hackney_response, Ref, {error,invalid_redirection}},
hackney_manager:handle_error(Client2);
_ ->
case hackney_response:skip_body(Client2) of
{skip, Client3} ->
hackney_manager:store_state(Client3),
Owner ! {hackney_response, Ref,
{redirect, Location, Headers}};
Error ->
Owner ! {hackney_response, Ref, Error},
hackney_manager:handle_error(Client2)
end
end;
{error, Error} ->
Owner ! {hackney_response, Ref, {error, Error}},
hackney_manager:handle_error(Client)
end.
%% The second case is for status code 303 and POST requests.
%% This results in sending {see_other, Location, Headers} to the owner.
maybe_redirect_2(Parent, Owner, Ref, Reason,
#client{transport=Transport,
socket=Socket}=Client) ->
Transport:setopts(Socket, [{active, false}]),
case parse(Client) of
{loop, Client2} ->
maybe_redirect_2(Parent, Owner, Ref, Reason, Client2);
{more, Client2, Rest} ->
Continuation = fun(Client3) ->
maybe_redirect_2(Parent, Owner, Ref, Reason, Client3)
end,
async_recv(Parent, Owner, Ref, Client2, Rest, Continuation);
{ok, {headers, Headers}, Client2} ->
case hackney:redirect_location(Headers) of
undefined ->
Owner ! {hackney_response, Ref,
{error, invalid_redirection}},
hackney_manager:handle_error(Client2);
Location ->
case hackney_response:skip_body(Client2) of
{skip, Client3} ->
hackney_manager:store_state(Client3),
Owner ! {hackney_response, Ref,
{see_other, Location, Headers}};
Error ->
Owner ! {hackney_response, Ref, Error},
hackney_manager:handle_error(Client2)
end
end;
{error, Error} ->
Owner ! {hackney_response, Ref, {error, Error}},
hackney_manager:handle_error(Client)
end.
async_recv(Parent, Owner, Ref, Client, Buffer) ->
Continuation = fun(Client2) ->
stream_loop(Parent, Owner, Ref, Client2)
end,
async_recv(Parent, Owner, Ref, Client, Buffer, Continuation).
async_recv(Parent, Owner, Ref,
#client{transport=Transport,
socket=TSock,
recv_timeout=Timeout}=Client, Buffer, Continuation) ->
{OK, Closed, Error} = Transport:messages(TSock),
Sock = raw_sock(TSock),
Transport:setopts(TSock, [{active, once}]),
%% some useful info
#client{version=Version, clen=CLen, te=TE} = Client,
receive
{Ref, resume} ->
async_recv(Parent, Owner, Ref, Client, Buffer);
{Ref, stream_next} ->
async_recv(Parent, Owner, Ref, Client, Buffer);
{Ref, pause} ->
%% make sure that the process won't be awoken by a tcp msg
Transport:setopts(TSock, [{active, false}]),
proc_lib:hibernate(?MODULE, async_recv, [Parent, Owner, Ref,
Client, Buffer]);
{Ref, close} ->
Transport:close(TSock);
{Ref, stop_async, From} ->
hackney_manager:store_state(Client#client{async=false}),
Transport:setopts(TSock, [{active, false}]),
Transport:controlling_process(TSock, From),
From ! {Ref, ok};
{OK, Sock, Data} ->
Continuation(Client#client{buffer=Data});
{Closed, Sock} ->
case Client#client.response_state of
on_body when (Version =:= {1, 0} orelse Version =:= {1, 1})
andalso (CLen =:= undefined orelse CLen =:= nil) ->
Owner ! {hackney_response, Ref, Buffer},
Owner ! {hackney_response, Ref, done},
ok;
on_body when TE =:= <<"identity">> ->
Owner ! {hackney_response, Ref, Buffer},
Owner ! {hackney_response, Ref, done},
ok;
on_body ->
Owner ! {hackney_response, Ref, {error, {closed, Buffer}}},
ok;
_ ->
Owner ! {hackney_response, Ref, {error, closed}},
ok
end,
Transport:close(Sock);
{Error, Sock, Reason} ->
Owner ! {hackney_response, Ref, {error, Reason}},
Transport:close(TSock);
{'DOWN', _MRef, process, Owner, Reason} ->
exit({owner_down, Owner, Reason});
{system, From, Request} ->
sys:handle_system_msg(Request, From, Parent, ?MODULE, [],
{async_recv, Parent, Owner, Ref, Client});
Else ->
?report_trace("stream: unexpected message", [{message, Else},
{sock, TSock}]),
error_logger:error_msg("Unexpected message: ~w~n", [Else])
after Timeout ->
Owner ! {hackney_response, Ref, {error, {closed, timeout}}},
Transport:close(TSock)
end.
system_continue(_, _, {maybe_continue, Parent, Owner, Ref, Client}) ->
maybe_continue(Parent, Owner, Ref, Client);
system_continue(_, _, {stream_loop, Parent, Owner, Ref, Client}) ->
stream_loop(Parent, Owner, Ref, Client);
system_continue(_, _, {async_recv, Parent, Owner, Ref, Client, Buffer}) ->
async_recv(Parent, Owner, Ref, Client, Buffer).
-spec system_terminate(any(), _, _, _) -> no_return().
system_terminate(Reason, _, _, {_, _, _, _Ref, _}) ->
exit(Reason).
system_code_change(Misc, _, _, _) ->
{ok, Misc}.
parse(#client{parser=Parser, buffer=Buffer}=Client) ->
Res = hackney_http:execute(Parser, Buffer),
process(Res, Client#client{buffer= <<>>}).
process({more, NParser}, Client) ->
NClient = update_client(NParser, Client),
{more, NClient, <<>>};
process({more, NParser, Buffer}, Client) ->
NClient = update_client(NParser, Client),
{more, NClient, Buffer};
process({response, Version, Status, Reason, Parser}, Client0) ->
Client1 = update_client(Parser, Client0#client{version=Version,
response_state=on_header}),
Client2 = case Status of
S when S =:= 204 orelse S =:= 304 ->
Client1#client{clen = 0};
_Otherwise ->
Client1
end,
{ok, Status, Reason, Client2};
process({header, {Key, Value}=KV, NParser},
#client{partial_headers=Headers}=Client) ->
%% store useful headers
Client1 = case hackney_bstr:to_lower(Key) of
<<"content-length">> ->
case hackney_util:to_int(Value) of
{ok, CLen} -> Client#client{clen=CLen};
false -> Client#client{clen=bad_int}
end;
<<"transfer-encoding">> ->
Client#client{te=hackney_bstr:to_lower(Value)};
<<"connection">> ->
Client#client{connection=hackney_bstr:to_lower(Value)};
<<"content-type">> ->
Client#client{ctype=hackney_bstr:to_lower(Value)};
<<"location">> ->
Client#client{location=Value};
_ ->
Client
end,
NHeaders = [KV | Headers],
NClient = update_client(NParser, Client1#client{partial_headers=NHeaders}),
{loop, NClient};
process({headers_complete, NParser},
#client{partial_headers=Headers}=Client) ->
NClient = update_client(NParser, Client#client{partial_headers=[],
response_state=on_body}),
{ok, {headers, lists:reverse(Headers)}, NClient};
process({ok, Data, NParser}, Client) ->
NClient = update_client(NParser, Client),
{ok, Data, NClient};
process({done, Rest}, Client) ->
Client2 = finish_response(Rest, Client),
hackney_manager:store_state(Client2),
done;
process(done, Client) ->
Client2 = finish_response(<<>>, Client),
hackney_manager:store_state(Client2),
done;
process({error, Reason}, _Client) ->
{error, Reason};
process(Error, _Client) ->
{error, Error}.
update_client(Parser, Client) ->
Client#client{parser=Parser}.
finish_response(Rest, Client0) ->
Client = Client0#client{response_state=done,
body_state=done,
parser=nil,
buffer=Rest,
async=false,
stream_to=false},
Pool = hackney_connect:is_pool(Client),
case hackney_response:maybe_close(Client) of
true ->
hackney_response:close(Client);
false when Pool /= false ->
#client{socket=Socket,
socket_ref=Ref,
pool_handler=Handler}=Client,
Handler:checkin(Ref, Socket),
Client#client{state=closed, socket=nil, socket_ref=nil};
false ->
Client
end.
raw_sock({hackney_ssl, RawSock}) ->
RawSock;
raw_sock({hackney_tcp, RawSock}) ->
RawSock;
raw_sock(RawSock) ->
RawSock.
%% check that no events from the sockets is received
%% after giving the control back.
flush(Transport, Socket) ->
{Msg, MsgClosed, MsgError} = Transport:messages(Socket),
receive
{Msg, Socket, _} -> flush(Transport, Socket) ;
{MsgClosed, Socket} -> flush(Transport, Socket) ;
{MsgError, Socket, _} -> flush(Transport, Socket)
after 0 ->
ok
end.