web_socket_channel 2.4.4 copy "web_socket_channel: ^2.4.4" to clipboard
web_socket_channel: ^2.4.4 copied to clipboard

StreamChannel wrappers for WebSockets. Provides a cross-platform WebSocketChannel API, a cross-platform implementation of that API that communicates over an underlying StreamChannel.

CI pub package package publisher

package:web_socket_channel provides cross-platform StreamChannel wrappers for WebSocket connections.

Docs and Usage #

It provides a cross-platform WebSocketChannel API, a cross-platform implementation of that API that communicates over an underlying StreamChannel, an implementation that wraps dart:io's WebSocket class, and a similar implementation that wraps dart:html's.

It also provides constants for the WebSocket protocol's pre-defined status codes in the status.dart library. It's strongly recommended that users import this library with the prefix status.

import 'package:web_socket_channel/web_socket_channel.dart';
import 'package:web_socket_channel/status.dart' as status;

main() async {
  final wsUrl = Uri.parse('ws://example.com');
  final channel = WebSocketChannel.connect(wsUrl);

  await channel.ready;

  channel.stream.listen((message) {
    channel.sink.add('received!');
    channel.sink.close(status.goingAway);
  });
}

WebSocketChannel #

The WebSocketChannel class's most important role is as the interface for WebSocket stream channels across all implementations and all platforms. In addition to the base StreamChannel interface, it adds a protocol getter that returns the negotiated protocol for the socket, as well as closeCode and closeReason getters that provide information about why the socket closed.

The channel's sink property is also special. It returns a WebSocketSink, which is just like a StreamSink except that its close() method supports optional closeCode and closeReason parameters. These parameters allow the caller to signal to the other socket exactly why they're closing the connection.

WebSocketChannel also works as a cross-platform implementation of the WebSocket protocol. The WebSocketChannel.connect constructor connects to a listening server using the appropriate implementation for the platform. The WebSocketChannel() constructor takes an underlying StreamChannel over which it communicates using the WebSocket protocol. It also provides the static signKey() method to make it easier to implement the initial WebSocket handshake. These are used in the shelf_web_socket package to support WebSockets in a cross-platform way.

1171
likes
130
pub points
100%
popularity

Publisher

verified publishertools.dart.dev

StreamChannel wrappers for WebSockets. Provides a cross-platform WebSocketChannel API, a cross-platform implementation of that API that communicates over an underlying StreamChannel.

Repository (GitHub)
View/report issues
Contributing

Documentation

API reference

License

BSD-3-Clause (LICENSE)

Dependencies

async, crypto, stream_channel, web

More

Packages that depend on web_socket_channel