Stomp Dart
This library provides an implementation for a STOMP client connecting to a remote server. It should work for both pure dart and flutter.
Usage
Initialize
The client gets created the specified config, please see the Config section to see all available options
StompClient client = StompClient(
config: StompConfig(
url: 'wss://yourserver',
onConnect: onConnectCallback
)
);
The connect callback should be used to make sure that we are actually connected before we subscribe or send messages
void onConnectCallback(StompClient client, StompFrame connectFrame) {
// use the client object passed.
}
Connect
client.activate();
Subscribe
client.subscribe(destination: '/foo/bar', headers: {}, callback: (frame) {
// Received a frame for this subscription
print(frame.body);
})
Ack/Nack
client.ack(id: message-id, headers: headers);
client.nack(id: message-id, headers: headers);
Unsubscribe
client.subscribe(...) returns a function which can be called with an optional map of headers
dynamic unsubscribeFn = client.subscribe(destination: '/foo/bar', headers: {}, callback: (frame) {
// Received a frame for this subscription
print(frame.body);
})
...
unsubscribeFn(unsubscribeHeaders: {});
Send
client.send(destination: '/foo/bar', body: 'Your message body', headers: {});
Disconnect
client.deactivate();
StompConfig
This table shows all available options in StompConfig
| Option | Description |
|---|---|
| url: String | The url of the server you want connect to (required) |
| reconnectDelay: int | The time in milliseconds between reconnect attempts. Set to 0 if you don't want to reconnect automatically |
| heartbeatOutgoing: int | The time in milliseconds between outgoing heartbeat messages. Set to 0 to not send any heartbeats |
| heartbeatIncoming: int | The time in milliseconds between incoming heartbeat messages. Set to 0 to not receive any heartbeats |
| connectionTimeout: Duration | Time duration it waits until a connection attempt is aborted |
| stompConnectHeaders: Map<String, String> | The header values which will be used on the STOMP connect frame |
| webSocketConnectHeaders: Map<String, dynamic> | The header values which will be used when connecting to the underyling WebSocket |
| beforeConnect: Future | A async function which will be awaited before a connection is established. |
| onConnect: Function(StompClient, StompFrame) | Function to be called when the client successfully connected to the server. |
| onDisconnect: Function(StompFrame) | Function to be called when the client disconnects expectedly |
| onStompError: Function(StompFrame) | Function to be called when the stomp server sends an error frame |
| onUnhandledFrame: Function(StompFrame) | Function to be called when the server sends a unrecognized frame |
| onUnhandledMessage: Function(StompFrame) | Function to be called when a subscription message does not have a handler |
| onUnhandledReceipt: Function(StompFrame) | Function to be called when a receipt message does not have a registered watcher |
| onWebSocketError: Function(dynamic) | Function to be called when the underyling WebSocket throws an error |
| onWebSocketDone: Function() | Function to be called when the underyling WebSocket is done/disconnected |
| onDebugMessage: Function(String) | Function to be called for debug messages generated by the internal message handler |
Use Stomp with SockJS
Use StompConfig.SockJS constructor instead of default StompConfig constructor.
StompClient client = StompClient(
config: StompConfig.SockJS(
url: 'https://yourserver',
onConnect: onConnectCallback
)
);
Development
Running unit tests
pub run test -p "chrome,vm" test/
Generating coverage data
pub global activate coverage
pub global run coverage:collect_coverage --port=8111 --out=coverage.json --wait-paused --resume-isolates & dart --disable-service-auth-codes --enable-vm-service=8111 --pause-isolates-on-exit test/test_all.dart
And to convert to lcov
pub global run coverage:format_coverage --lcov --in=coverage.json --out=lcov.info --packages=.packages --report-on=lib