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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(StompFrame connectFrame) {
    // client is connected and ready
}

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: Duration Time duration between reconnect attempts. Set to 0 ms if you don't want to reconnect automatically. The default value is 5 seconds
heartbeatOutgoing: Duration Time duration between outgoing heartbeat messages. Set to 0 ms to not send any heartbeats. The default value is 5 seconds
heartbeatIncoming: Duration Time duration between incoming heartbeat messages. Set to 0 ms to not receive any heartbeats. The default value is 5 seconds
connectionTimeout: Duration Time duration it waits until a connection attempt is aborted. Set to 0 ms to not set a timeout. The default value is 0 ms
stompConnectHeaders: Map<String, String> Optional header values which will be used on the STOMP connect frame
webSocketConnectHeaders: Map<String, dynamic> Optional header values which will be used when connecting to the underlying WebSocket (not supported in Web)
beforeConnect: Future Function() An async function which will be awaited before a connection is established
onConnect: Function(StompFrame) Function to be called when the client successfully connects 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. Note: This library does not use SockJS as its underlying connection protocol. It uses normal WebSockets, but supports SockJS URLs and data packets (https://sockjs.github.io/sockjs-protocol/sockjs-protocol-0.3.3.html#section-36 & https://sockjs.github.io/sockjs-protocol/sockjs-protocol-0.3.3.html#section-42)

StompClient client = StompClient(
    config: StompConfig.sockJS(
        url: 'https://yourserver',
        onConnect: onConnectCallback
    )
);

Evaluation of headers

The STOMP client checks the content-type while parsing a received message. If the header contains the value application/octet-stream the message body will be treated as binary data. The resulting StompFrame will have a binaryBody. The body of the frame will be empty in this case. The same is true if the content-type header is missing.

Token Authentication (browser-based clients)

Browser clients can only use standard authentication headers (that is, basic HTTP authentication) or cookies and cannot provide custom headers (such as "Authorization" to use a Bearer token). Thus webSocketConnectHeaders will do nothing in a browser environment. Alternatives are:

  • Use the STOMP client to pass authentication headers at connect time. (recommended)
    • Use stompConnectHeaders to pass your headers in the CONNECT frame. Parse those headers on the server (i.e. by using a ChannelInterceptor in Spring)
  • Pass your authentication token/credentials as query parameter.

Development

Running unit tests

dart run test -p "chrome,vm" test/

Generating coverage data

dart pub global activate coverage
dart 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

dart pub global run coverage:format_coverage --lcov --in=coverage.json --out=lcov.info --packages=.packages --report-on=lib