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Added WebSockets support. Use the {% comet %} tag to enable it.. the …
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| %% @author Marc Worrell <marc@worrell.nl> | ||
| %% @copyright 2010 Marc Worrell | ||
| %% @doc WebSocket connections | ||
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| %% Copyright 2010 Marc Worrell | ||
| %% | ||
| %% Licensed under the Apache License, Version 2.0 (the "License"); | ||
| %% you may not use this file except in compliance with the License. | ||
| %% You may obtain a copy of the License at | ||
| %% | ||
| %% http://www.apache.org/licenses/LICENSE-2.0 | ||
| %% | ||
| %% Unless required by applicable law or agreed to in writing, software | ||
| %% distributed under the License is distributed on an "AS IS" BASIS, | ||
| %% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| %% See the License for the specific language governing permissions and | ||
| %% limitations under the License. | ||
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| -module(resource_websocket). | ||
| -author("Marc Worrell <marc@worrell.nl>"). | ||
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| -export([ | ||
| init/1, | ||
| upgrades_provided/2, | ||
| websocket_start/1, | ||
| loop/3, | ||
| send_loop/2 | ||
| ]). | ||
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| -include_lib("webmachine_resource.hrl"). | ||
| -include_lib("include/zotonic.hrl"). | ||
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| init([]) -> {ok, []}. | ||
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| upgrades_provided(ReqData, State) -> | ||
| {[ | ||
| {"WebSocket", websocket_start} | ||
| ], ReqData, State}. | ||
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| %% @doc Initiate the websocket connection upgrade | ||
| websocket_start(ReqData) -> | ||
| Context = z_context:new(ReqData), | ||
| Context1 = z_context:ensure_all(Context), | ||
| Socket = webmachine_request:socket(ReqData), | ||
| Hostname = m_site:get(hostname, Context1), | ||
| WebSocketPath = z_dispatcher:url_for(websocket, Context1), | ||
| Data = ["HTTP/1.1 101 Web Socket Protocol Handshake", 13, 10, | ||
| "Upgrade: WebSocket", 13, 10, | ||
| "Connection: Upgrade", 13, 10, | ||
| "WebSocket-Origin: http://", Hostname, 13, 10, | ||
| "WebSocket-Location: ws://", Hostname, WebSocketPath, 13, 10, | ||
| 13, 10], | ||
| ok = send(Socket, Data), | ||
| spawn_link(fun() -> start_send_loop(Socket, Context1) end), | ||
| loop(none, Socket, Context1). | ||
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| %% @doc Start receiving messages from the websocket | ||
| loop(Buff, Socket, Context) -> | ||
| case gen_tcp:recv(Socket, 0) of | ||
| {ok, Received} -> | ||
| handle_data(Buff, Received, Socket, Context); | ||
| {error, Reason} -> | ||
| {error, Reason} | ||
| end. | ||
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| %% @doc Upack any data frames, send them to the handling functions. | ||
| handle_data(none, <<0,T/binary>>, Socket, Context) -> | ||
| handle_data(<<>>, T, Socket, Context); | ||
| handle_data(none, <<>>, Socket, Context) -> | ||
| resource_websocket:loop(none, Socket, Context); | ||
| handle_data(Msg, <<255,T/binary>>, Socket, Context) -> | ||
| handle_message(Msg, Context), | ||
| handle_data(none, T, Socket, Context); | ||
| handle_data(Msg, <<H,T/binary>>, Socket, Context) -> | ||
| handle_data(<<Msg/binary, H>>, T, Socket, Context); | ||
| handle_data(Msg, <<>>, Socket, Context) -> | ||
| resource_websocket:loop(Msg, Socket, Context). | ||
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| %% Handle a message from the browser, should contain an url encoded request. Sends result script back to browser. | ||
| handle_message(Msg, Context) -> | ||
| Qs = mochiweb_util:parse_qs(Msg), | ||
| Context1 = z_context:set('q', Qs, Context), | ||
| Postback = z_context:get_q("postback", Context1), | ||
| {EventType, TriggerId, TargetId, Tag, Module} = z_utils:depickle(Postback, Context1), | ||
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| TriggerId1 = case TriggerId of | ||
| undefined -> proplists:get_q("z_trigger_id", Context1); | ||
| _ -> TriggerId | ||
| end, | ||
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| ContextRsc = z_context:set_resource_module(Module, Context1), | ||
| EventContext = case EventType of | ||
| "submit" -> | ||
| case z_validation:validate_query_args(ContextRsc) of | ||
| {ok, ContextEval} -> | ||
| Module:event({submit, Tag, TriggerId1, TargetId}, ContextEval); | ||
| {error, ContextEval} -> | ||
| ContextEval | ||
| end; | ||
| _ -> | ||
| Module:event({postback, Tag, TriggerId1, TargetId}, ContextRsc) | ||
| end, | ||
| Script = iolist_to_binary(z_script:get_script(EventContext)), | ||
| z_session_page:add_script(Script, EventContext). | ||
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| %% @doc Start the loop passing data (scripts) from the page to the browser | ||
| start_send_loop(Socket, Context) -> | ||
| z_session_page:websocket_attach(self(), Context), | ||
| send_loop(Socket, Context). | ||
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| send_loop(Socket, Context) -> | ||
| receive | ||
| {send_data, Data} -> | ||
| case send(Socket, [0, Data, 255]) of | ||
| ok -> resource_websocket:send_loop(Socket, Context); | ||
| closed -> closed | ||
| end; | ||
| _ -> | ||
| resource_websocket:send_loop(Socket, Context) | ||
| end. | ||
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| %% @doc Send data to the user agent | ||
| send(undefined, _Data) -> | ||
| ok; | ||
| send(Socket, Data) -> | ||
| case gen_tcp:send(Socket, iolist_to_binary(Data)) of | ||
| ok -> ok; | ||
| {error, closed} -> closed; | ||
| _ -> exit(normal) | ||
| end. |
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