Allow HTTP protocol upgrades to use keepalive

REST needed this to be allowed to chain requests on the same connection.

4 files changed, 79 insertions, 48 deletions

diff --git a/src/cowboy_http_protocol.erl b/src/cowboy_http_protocol.erl
index 54df29f..3a6522f 100644
--- a/src/cowboy_http_protocol.erl
+++ b/src/cowboy_http_protocol.erl
@@ -219,8 +219,8 @@ dispatch(Next, Req=#http_req{host=Host, path=Path},
 	end.
 
 -spec handler_init(#http_req{}, #state{}) -> ok | none().
-handler_init(Req, State=#state{listener=ListenerPid,
-		transport=Transport, handler={Handler, Opts}}) ->
+handler_init(Req, State=#state{transport=Transport,
+		handler={Handler, Opts}}) ->
 	try Handler:init({Transport:name(), http}, Req, Opts) of
 		{ok, Req2, HandlerState} ->
 			handler_handle(HandlerState, Req2, State);
@@ -239,7 +239,7 @@ handler_init(Req, State=#state{listener=ListenerPid,
 			handler_terminate(HandlerState, Req2, State);
 		%% @todo {upgrade, transport, Module}
 		{upgrade, protocol, Module} ->
-			Module:upgrade(ListenerPid, Handler, Opts, Req)
+			upgrade_protocol(Req, State, Module)
 	catch Class:Reason ->
 		error_terminate(500, State),
 		error_logger:error_msg(
@@ -250,11 +250,19 @@ handler_init(Req, State=#state{listener=ListenerPid,
 			[Handler, Class, Reason, Opts, Req, erlang:get_stacktrace()])
 	end.
 
+-spec upgrade_protocol(#http_req{}, #state{}, atom()) -> ok | none().
+upgrade_protocol(Req, State=#state{listener=ListenerPid,
+		handler={Handler, Opts}}, Module) ->
+	case Module:upgrade(ListenerPid, Handler, Opts, Req) of
+		{UpgradeRes, Req2} -> next_request(Req2, State, UpgradeRes);
+		_Any -> terminate(State)
+	end.
+
 -spec handler_handle(any(), #http_req{}, #state{}) -> ok | none().
 handler_handle(HandlerState, Req, State=#state{handler={Handler, Opts}}) ->
 	try Handler:handle(Req, HandlerState) of
 		{ok, Req2, HandlerState2} ->
-			next_request(HandlerState2, Req2, State)
+			terminate_request(HandlerState2, Req2, State)
 	catch Class:Reason ->
 		error_logger:error_msg(
 			"** Handler ~p terminating in handle/2~n"
@@ -294,7 +302,7 @@ handler_loop_timeout(State=#state{loop_timeout=Timeout,
 handler_loop(HandlerState, Req, State=#state{loop_timeout_ref=TRef}) ->
 	receive
 		{?MODULE, timeout, TRef} ->
-			next_request(HandlerState, Req, State);
+			terminate_request(HandlerState, Req, State);
 		{?MODULE, timeout, OlderTRef} when is_reference(OlderTRef) ->
 			handler_loop(HandlerState, Req, State);
 		Message ->
@@ -306,7 +314,7 @@ handler_call(HandlerState, Req, State=#state{handler={Handler, Opts}},
 		Message) ->
 	try Handler:info(Message, Req, HandlerState) of
 		{ok, Req2, HandlerState2} ->
-			next_request(HandlerState2, Req2, State);
+			terminate_request(HandlerState2, Req2, State);
 		{loop, Req2, HandlerState2} ->
 			handler_before_loop(HandlerState2, Req2, State);
 		{loop, Req2, HandlerState2, hibernate} ->
@@ -336,10 +344,14 @@ handler_terminate(HandlerState, Req, #state{handler={Handler, Opts}}) ->
 			 HandlerState, Req, erlang:get_stacktrace()])
 	end.
 
--spec next_request(any(), #http_req{}, #state{}) -> ok | none().
-next_request(HandlerState, Req=#http_req{connection=Conn, buffer=Buffer},
-		State) ->
+-spec terminate_request(any(), #http_req{}, #state{}) -> ok | none().
+terminate_request(HandlerState, Req, State) ->
 	HandlerRes = handler_terminate(HandlerState, Req, State),
+	next_request(Req, State, HandlerRes).
+
+-spec next_request(#http_req{}, #state{}, any()) -> ok | none().
+next_request(Req=#http_req{connection=Conn, buffer=Buffer},
+		State, HandlerRes) ->
 	BodyRes = ensure_body_processed(Req),
 	RespRes = ensure_response(Req),
 	case {HandlerRes, BodyRes, RespRes, Conn} of
diff --git a/src/cowboy_http_rest.erl b/src/cowboy_http_rest.erl
index 9bb66fa..3ef730f 100644
--- a/src/cowboy_http_rest.erl
+++ b/src/cowboy_http_rest.erl
@@ -53,7 +53,7 @@
 %% You do not need to call this function manually. To upgrade to the REST
 %% protocol, you simply need to return <em>{upgrade, protocol, {@module}}</em>
 %% in your <em>cowboy_http_handler:init/3</em> handler function.
--spec upgrade(pid(), module(), any(), #http_req{}) -> ok.
+-spec upgrade(pid(), module(), any(), #http_req{}) -> {ok, #http_req{}}.
 upgrade(_ListenerPid, Handler, Opts, Req) ->
 	try
 		case erlang:function_exported(Handler, rest_init, 2) of
@@ -753,6 +753,8 @@ respond(Req, State, StatusCode) ->
 
 terminate(Req, #state{handler=Handler, handler_state=HandlerState}) ->
 	case erlang:function_exported(Handler, rest_terminate, 2) of
-		true -> ok = Handler:rest_terminate(Req, HandlerState);
+		true -> ok = Handler:rest_terminate(
+			Req#http_req{resp_state=locked}, HandlerState);
 		false -> ok
-	end.
+	end,
+	{ok, Req}.
diff --git a/src/cowboy_http_websocket.erl b/src/cowboy_http_websocket.erl
index d40e7af..7013d7f 100644
--- a/src/cowboy_http_websocket.erl
+++ b/src/cowboy_http_websocket.erl
@@ -64,7 +64,7 @@
 %% You do not need to call this function manually. To upgrade to the WebSocket
 %% protocol, you simply need to return <em>{upgrade, protocol, {@module}}</em>
 %% in your <em>cowboy_http_handler:init/3</em> handler function.
--spec upgrade(pid(), module(), any(), #http_req{}) -> ok | none().
+-spec upgrade(pid(), module(), any(), #http_req{}) -> closed | none().
 upgrade(ListenerPid, Handler, Opts, Req) ->
 	cowboy_listener:move_connection(ListenerPid, websocket, self()),
 	case catch websocket_upgrade(#state{handler=Handler, opts=Opts}, Req) of
@@ -113,7 +113,7 @@ websocket_upgrade(Version, State, Req)
 	IntVersion = list_to_integer(binary_to_list(Version)),
 	{ok, State#state{version=IntVersion, challenge=Challenge}, Req2}.
 
--spec handler_init(#state{}, #http_req{}) -> ok | none().
+-spec handler_init(#state{}, #http_req{}) -> closed | none().
 handler_init(State=#state{handler=Handler, opts=Opts},
 		Req=#http_req{transport=Transport}) ->
 	try Handler:websocket_init(Transport:name(), Req, Opts) of
@@ -139,31 +139,27 @@ handler_init(State=#state{handler=Handler, opts=Opts},
 			[Handler, Class, Reason, Opts, Req, erlang:get_stacktrace()])
 	end.
 
--spec upgrade_error(#http_req{}) -> ok.
+-spec upgrade_error(#http_req{}) -> closed.
 upgrade_error(Req) ->
-	{ok, Req2} = cowboy_http_req:reply(400, [], [],
+	{ok, _Req2} = cowboy_http_req:reply(400, [], [],
 		Req#http_req{resp_state=waiting}),
-	upgrade_terminate(Req2).
+	closed.
 
 %% @see cowboy_http_protocol:ensure_response/1
--spec upgrade_denied(#http_req{}) -> ok.
-upgrade_denied(Req=#http_req{resp_state=done}) ->
-	upgrade_terminate(Req);
+-spec upgrade_denied(#http_req{}) -> closed.
+upgrade_denied(#http_req{resp_state=done}) ->
+	closed;
 upgrade_denied(Req=#http_req{resp_state=waiting}) ->
-	{ok, Req2} = cowboy_http_req:reply(400, [], [], Req),
-	upgrade_terminate(Req2);
-upgrade_denied(Req=#http_req{method='HEAD', resp_state=chunks}) ->
-	upgrade_terminate(Req);
-upgrade_denied(Req=#http_req{socket=Socket, transport=Transport,
+	{ok, _Req2} = cowboy_http_req:reply(400, [], [], Req),
+	closed;
+upgrade_denied(#http_req{method='HEAD', resp_state=chunks}) ->
+	closed;
+upgrade_denied(#http_req{socket=Socket, transport=Transport,
 		resp_state=chunks}) ->
 	Transport:send(Socket, <<"0\r\n\r\n">>),
-	upgrade_terminate(Req).
+	closed.
 
--spec upgrade_terminate(#http_req{}) -> ok.
-upgrade_terminate(#http_req{socket=Socket, transport=Transport}) ->
-	Transport:close(Socket).
-
--spec websocket_handshake(#state{}, #http_req{}, any()) -> ok | none().
+-spec websocket_handshake(#state{}, #http_req{}, any()) -> closed | none().
 websocket_handshake(State=#state{version=0, origin=Origin,
 		challenge={Key1, Key2}}, Req=#http_req{socket=Socket,
 		transport=Transport, raw_host=Host, port=Port,
@@ -185,7 +181,7 @@ websocket_handshake(State=#state{version=0, origin=Origin,
 			handler_before_loop(State#state{messages=Transport:messages()},
 				Req3, HandlerState, <<>>);
 		_Any ->
-			ok %% If an error happened reading the body, stop there.
+			closed %% If an error happened reading the body, stop there.
 	end;
 websocket_handshake(State=#state{challenge=Challenge},
 		Req=#http_req{transport=Transport}, HandlerState) ->
@@ -197,7 +193,7 @@ websocket_handshake(State=#state{challenge=Challenge},
 	handler_before_loop(State#state{messages=Transport:messages()},
 		Req2, HandlerState, <<>>).
 
--spec handler_before_loop(#state{}, #http_req{}, any(), binary()) -> ok | none().
+-spec handler_before_loop(#state{}, #http_req{}, any(), binary()) -> closed | none().
 handler_before_loop(State=#state{hibernate=true},
 		Req=#http_req{socket=Socket, transport=Transport},
 		HandlerState, SoFar) ->
@@ -222,7 +218,7 @@ handler_loop_timeout(State=#state{timeout=Timeout, timeout_ref=PrevRef}) ->
 	State#state{timeout_ref=TRef}.
 
 %% @private
--spec handler_loop(#state{}, #http_req{}, any(), binary()) -> ok | none().
+-spec handler_loop(#state{}, #http_req{}, any(), binary()) -> closed | none().
 handler_loop(State=#state{messages={OK, Closed, Error}, timeout_ref=TRef},
 		Req=#http_req{socket=Socket}, HandlerState, SoFar) ->
 	receive
@@ -242,7 +238,7 @@ handler_loop(State=#state{messages={OK, Closed, Error}, timeout_ref=TRef},
 				SoFar, websocket_info, Message, fun handler_before_loop/4)
 	end.
 
--spec websocket_data(#state{}, #http_req{}, any(), binary()) -> ok | none().
+-spec websocket_data(#state{}, #http_req{}, any(), binary()) -> closed | none().
 %% No more data.
 websocket_data(State, Req, HandlerState, <<>>) ->
 	handler_before_loop(State, Req, HandlerState, <<>>);
@@ -296,14 +292,14 @@ websocket_data(State, Req, HandlerState, _Bad) ->
 
 %% hybi unmasking.
 -spec websocket_unmask(#state{}, #http_req{}, any(), binary(),
-	opcode(), binary(), mask_key()) -> ok | none().
+	opcode(), binary(), mask_key()) -> closed | none().
 websocket_unmask(State, Req, HandlerState, RemainingData,
 		Opcode, Payload, MaskKey) ->
 	websocket_unmask(State, Req, HandlerState, RemainingData,
 		Opcode, Payload, MaskKey, <<>>).
 
 -spec websocket_unmask(#state{}, #http_req{}, any(), binary(),
-	opcode(), binary(), mask_key(), binary()) -> ok | none().
+	opcode(), binary(), mask_key(), binary()) -> closed | none().
 websocket_unmask(State, Req, HandlerState, RemainingData,
 		Opcode, << O:32, Rest/bits >>, MaskKey, Acc) ->
 	T = O bxor MaskKey,
@@ -334,7 +330,7 @@ websocket_unmask(State, Req, HandlerState, RemainingData,
 
 %% hybi dispatching.
 -spec websocket_dispatch(#state{}, #http_req{}, any(), binary(),
-	opcode(), binary()) -> ok | none().
+	opcode(), binary()) -> closed | none().
 %% @todo Fragmentation.
 %~ websocket_dispatch(State, Req, HandlerState, RemainingData, 0, Payload) ->
 %% Text frame.
@@ -362,7 +358,7 @@ websocket_dispatch(State, Req, HandlerState, RemainingData, 10, Payload) ->
 		websocket_handle, {pong, Payload}, fun websocket_data/4).
 
 -spec handler_call(#state{}, #http_req{}, any(), binary(),
-	atom(), any(), fun()) -> ok | none().
+	atom(), any(), fun()) -> closed | none().
 handler_call(State=#state{handler=Handler, opts=Opts}, Req, HandlerState,
 		RemainingData, Callback, Message, NextState) ->
 	try Handler:Callback(Message, Req, HandlerState) of
@@ -391,7 +387,7 @@ handler_call(State=#state{handler=Handler, opts=Opts}, Req, HandlerState,
 		websocket_close(State, Req, HandlerState, {error, handler})
 	end.
 
--spec websocket_send(binary(), #state{}, #http_req{}) -> ok | ignore.
+-spec websocket_send(binary(), #state{}, #http_req{}) -> closed | ignore.
 %% hixie-76 text frame.
 websocket_send({text, Payload}, #state{version=0},
 		#http_req{socket=Socket, transport=Transport}) ->
@@ -411,21 +407,19 @@ websocket_send({Type, Payload}, _State,
 	Transport:send(Socket, [<< 1:1, 0:3, Opcode:4, 0:1, Len/bits >>,
 		Payload]).
 
--spec websocket_close(#state{}, #http_req{}, any(), {atom(), atom()}) -> ok.
+-spec websocket_close(#state{}, #http_req{}, any(), {atom(), atom()}) -> closed.
 websocket_close(State=#state{version=0}, Req=#http_req{socket=Socket,
 		transport=Transport}, HandlerState, Reason) ->
 	Transport:send(Socket, << 255, 0 >>),
-	Transport:close(Socket),
 	handler_terminate(State, Req, HandlerState, Reason);
 %% @todo Send a Payload? Using Reason is usually good but we're quite careless.
 websocket_close(State, Req=#http_req{socket=Socket,
 		transport=Transport}, HandlerState, Reason) ->
 	Transport:send(Socket, << 1:1, 0:3, 8:4, 0:8 >>),
-	Transport:close(Socket),
 	handler_terminate(State, Req, HandlerState, Reason).
 
 -spec handler_terminate(#state{}, #http_req{},
-	any(), atom() | {atom(), atom()}) -> ok.
+	any(), atom() | {atom(), atom()}) -> closed.
 handler_terminate(#state{handler=Handler, opts=Opts},
 		Req, HandlerState, TerminateReason) ->
 	try
@@ -438,7 +432,8 @@ handler_terminate(#state{handler=Handler, opts=Opts},
 			"** Request was ~p~n** Stacktrace: ~p~n~n",
 			[Handler, Class, Reason, TerminateReason, Opts,
 			 HandlerState, Req, erlang:get_stacktrace()])
-	end.
+	end,
+	closed.
 
 %% hixie-76 specific.
 
diff --git a/test/http_SUITE.erl b/test/http_SUITE.erl
index 8fdc52d..61c66ff 100644
--- a/test/http_SUITE.erl
+++ b/test/http_SUITE.erl
@@ -25,7 +25,7 @@
 	set_resp_overwrite/1, set_resp_body/1, response_as_req/1]). %% http.
 -export([http_200/1, http_404/1]). %% http and https.
 -export([http_10_hostless/1]). %% misc.
--export([rest_simple/1]). %% rest.
+-export([rest_simple/1, rest_keepalive/1]). %% rest.
 
 %% ct.
 
@@ -41,7 +41,7 @@ groups() ->
 		set_resp_body, response_as_req] ++ BaseTests},
 	{https, [], BaseTests},
 	{misc, [], [http_10_hostless]},
-	{rest, [], [rest_simple]}].
+	{rest, [], [rest_simple, rest_keepalive]}].
 
 init_per_suite(Config) ->
 	application:start(inets),
@@ -299,7 +299,12 @@ ws0(Config) ->
 	{ok, << 0, "websocket_handle", 255 >>} = gen_tcp:recv(Socket, 0, 6000),
 	{ok, << 0, "websocket_handle", 255 >>} = gen_tcp:recv(Socket, 0, 6000),
 	{ok, << 0, "websocket_handle", 255 >>} = gen_tcp:recv(Socket, 0, 6000),
-	ok = gen_tcp:send(Socket, << 255, 0 >>),
+	%% We try to send another HTTP request to make sure
+	%% the server closed the request.
+	ok = gen_tcp:send(Socket, [
+		<< 255, 0 >>, %% Close websocket command.
+		"GET / HTTP/1.1\r\nHost: localhost\r\n\r\n" %% Server should ignore it.
+	]),
 	{ok, << 255, 0 >>} = gen_tcp:recv(Socket, 0, 6000),
 	{error, closed} = gen_tcp:recv(Socket, 0, 6000),
 	ok.
@@ -574,3 +579,20 @@ http_10_hostless(Config) ->
 rest_simple(Config) ->
 	Packet = "GET /simple HTTP/1.1\r\nHost: localhost\r\n\r\n",
 	{Packet, 200} = raw_req(Packet, Config).
+
+rest_keepalive(Config) ->
+	{port, Port} = lists:keyfind(port, 1, Config),
+	{ok, Socket} = gen_tcp:connect("localhost", Port,
+		[binary, {active, false}, {packet, raw}]),
+	ok = rest_keepalive_loop(Socket, 100),
+	ok = gen_tcp:close(Socket).
+
+rest_keepalive_loop(_Socket, 0) ->
+	ok;
+rest_keepalive_loop(Socket, N) ->
+	ok = gen_tcp:send(Socket, "GET /simple HTTP/1.1\r\n"
+		"Host: localhost\r\nConnection: keep-alive\r\n\r\n"),
+	{ok, Data} = gen_tcp:recv(Socket, 0, 6000),
+	{0, 12} = binary:match(Data, <<"HTTP/1.1 200">>),
+	nomatch = binary:match(Data, <<"Connection: close">>),
+	rest_keepalive_loop(Socket, N - 1).