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%% This module behaves differently depending on a specific header.
-module(stream_handler_h).
-behavior(cowboy_stream).
-export([init/3]).
-export([data/4]).
-export([info/3]).
-export([terminate/3]).
-export([early_error/5]).
-record(state, {
pid,
test
}).
init(StreamID, Req, Opts) ->
Pid = list_to_pid(binary_to_list(cowboy_req:header(<<"x-test-pid">>, Req))),
Test = binary_to_atom(cowboy_req:header(<<"x-test-case">>, Req), latin1),
State = #state{pid=Pid, test=Test},
Pid ! {Pid, self(), init, StreamID, Req, Opts},
{init_commands(StreamID, Req, State), State}.
init_commands(_, _, State=#state{test=shutdown_on_stream_stop}) ->
Spawn = init_process(false, State),
[{headers, 200, #{}}, {spawn, Spawn, 5000}, stop];
init_commands(_, _, State=#state{test=shutdown_on_socket_close}) ->
Spawn = init_process(false, State),
[{headers, 200, #{}}, {spawn, Spawn, 5000}];
init_commands(_, _, State=#state{test=shutdown_timeout_on_stream_stop}) ->
Spawn = init_process(true, State),
[{headers, 200, #{}}, {spawn, Spawn, 2000}, stop];
init_commands(_, _, State=#state{test=shutdown_timeout_on_socket_close}) ->
Spawn = init_process(true, State),
[{headers, 200, #{}}, {spawn, Spawn, 2000}];
init_commands(_, _, _) ->
[{headers, 200, #{}}].
init_process(TrapExit, #state{pid=Pid}) ->
Self = self(),
Spawn = spawn_link(fun() ->
process_flag(trap_exit, TrapExit),
Pid ! {Pid, Self, spawned, self()},
receive {Pid, ready} -> ok after 1000 -> error(timeout) end,
Self ! {self(), ready},
receive after 5000 ->
Pid ! {Pid, Self, still_alive, self()}
end
end),
receive {Spawn, ready} -> ok after 1000 -> error(timeout) end,
Spawn.
data(StreamID, IsFin, Data, State=#state{pid=Pid}) ->
Pid ! {Pid, self(), data, StreamID, IsFin, Data, State},
{[], State}.
info(StreamID, Info, State=#state{pid=Pid}) ->
Pid ! {Pid, self(), info, StreamID, Info, State},
{[], State}.
terminate(StreamID, Reason, State=#state{pid=Pid}) ->
Pid ! {Pid, self(), terminate, StreamID, Reason, State},
ok.
%% This clause can only test for early errors that reached the required header.
early_error(StreamID, Reason, PartialReq, Resp, Opts) ->
Pid = list_to_pid(binary_to_list(cowboy_req:header(<<"x-test-pid">>, PartialReq))),
Pid ! {Pid, self(), early_error, StreamID, Reason, PartialReq, Resp, Opts},
Resp.
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