65 lines
1.9 KiB
Dart
65 lines
1.9 KiB
Dart
part of angel_websocket.server;
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/// Represents a WebSocket session, with the original
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/// [RequestContext] and [ResponseContext] attached.
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class WebSocketContext {
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/// Use this to listen for events.
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_WebSocketEventTable on = new _WebSocketEventTable();
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/// The underlying [StreamChannel].
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final StreamChannel channel;
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/// The original [RequestContext].
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final RequestContext request;
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/// The original [ResponseContext].
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final ResponseContext response;
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StreamController<WebSocketAction> _onAction =
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new StreamController<WebSocketAction>();
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StreamController<Null> _onClose = new StreamController<Null>();
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StreamController _onData = new StreamController();
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/// Fired on any [WebSocketAction];
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Stream<WebSocketAction> get onAction => _onAction.stream;
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/// Fired once the underlying [WebSocket] closes.
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Stream<Null> get onClose => _onClose.stream;
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/// Fired when any data is sent through [channel].
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Stream get onData => _onData.stream;
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WebSocketContext(this.channel, this.request, this.response);
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/// Closes the underlying [StreamChannel].
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Future close() async {
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await channel.sink.close();
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_onAction.close();
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_onData.close();
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_onClose.add(null);
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_onClose.close();
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}
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/// Sends an arbitrary [WebSocketEvent];
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void send(String eventName, data) {
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channel.sink
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.add(json.encode(new WebSocketEvent(eventName: eventName, data: data)));
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}
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/// Sends an error event.
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void sendError(AngelHttpException error) => send(EVENT_ERROR, error.toJson());
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}
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class _WebSocketEventTable {
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Map<String, StreamController<Map>> _handlers = {};
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StreamController<Map> _getStreamForEvent(String eventName) {
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if (!_handlers.containsKey(eventName))
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_handlers[eventName] = new StreamController<Map>();
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return _handlers[eventName];
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}
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Stream<Map> operator [](String key) => _getStreamForEvent(key).stream;
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}
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