A Dart-native turnkey solution for painless network synchronization.
crdt_sync takes care of the network plumbing between your app and backend to build products that are:
- Offline-first: Apps primarily work with a local store independent of network connectivity.
- Real-time: When online, the local store immediately and continuously synchronizes with the backend.
- Efficient: Synchronization relies on delta changesets to optimize the amount of data sent over the wire.
- Portable: All communication happens over a single standard WebSocket making it compatible with most network configurations.
This library is compatible with the crdt package and all of its implementations. It uses a standard communication protocol which abstracts the underlying storage method. This results in the dubious ability to synchronize SQL nodes with No-SQL ones. I don't judge.
See crdt for more details and a list of existing implementations.
You'll most likely want to use a persistent crdt store, however the following sample code uses an ephemeral MapCrdt for the sake of simplicity:
final crdt = MapCrdt(['chat']);Start listening for connections:
listen(crdt, 8080);Alternatively, you can use upgrade() to adopt an HttpRequest, or CrdtSync.server() to manage a WebSocket directly making it easy to integrate with Shelf and other server frameworks.
See tudo_server for a real world example.
Instantiate a CrdtSyncClient and order it to start connecting:
final client = CrdtSyncClient(crdt, Uri.parse('ws://localhost:8080'));
client.connect();Once connect() is called, the client will continuously attempt to establish or resume a connection until it succeeds, or until disconnect() is called.
See the included example for a more complete solution, or tudo for a real-world application.
Please file feature requests and bugs in the issue tracker.