dart_nats 0.1.8

A Dart client for the NATS messaging system. Design to use with Dart and flutter.

Dart-NATS

A Dart client for the NATS messaging system. Design to use with Dart and flutter.

Dart Examples:

Run the example/main.dart:

dart example/main.dart

import 'package:dart_nats/dart_nats.dart';

void main() async {
  var client = Client();
  client.connect('localhost');
  var sub = client.sub('subject1');
  client.pubString('subject1', 'message1');
  var msg = await sub.stream.first;

  print(msg.string);
  client.unSub(sub);
  client.close();
}

Flutter Examples:

Import and Declare object

import 'package:dart_nats/dart_nats.dart' as nats;

  nats.Client natsClient;
  nats.Subscription fooSub, barSub;

Simply connect to server and subscribe to subject

  void connect() {
    natsClient = nats.Client();
    natsClient.connect('demo.nats.io');
    fooSub = natsClient.sub('foo');
    barSub = natsClient.sub('bar');
  }

Use as Stream in StreamBuilder

          StreamBuilder(
            stream: fooSub.stream,
            builder: (context, AsyncSnapshot<nats.Message> snapshot) {
              return Text(snapshot.hasData ? '${snapshot.data.string}' : '');
            },
          ),

Publish Message

      natsClient.pubString('subject','message string');

Dispose

  void dispose() {
    natsClient.close();
    super.dispose();
  }

Full Flutter sample code example/flutter/main.dart

Features

The following is a list of features currently supported and planned by this client:

• • Publish
• • Subscribe, unsubscribe
• • NUID, Inbox
• • Reconnect to single server when connection lost and resume subscription
• • Unsubscribe after N message
• • Request, Respond
• • Queue subscribe
• • caches, flush, drain
• • Request timeout
• • structured data
• • Connection option (cluster, timeout,ping interval, max ping, echo,... )
• • Random automatic reconnection, disable reconnect, number of attempts, pausing
• • Connect to cluster,randomize, Automatic reconnect upon connection failure base server info
• • Events/status disconnect handler, reconnect handler
• • Buffering message during reconnect atempts
• • All authentication models, including NATS 2.0 JWT and seed keys
• • TLS support