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centrifuge

0.9.0

Dart client to communicate with Centrifuge and Centrifugo from Flutter and VM over dart:io WebSocket

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Websocket client for Centrifugo server and Centrifuge library.

There is no v1 release of this library yet – API still evolves. At the moment patch version updates only contain backwards compatible changes, minor version updates can have backwards incompatible API changes.

Check out client SDK API specification to learn how this SDK behaves. It's recommended to read that before starting to work with this SDK as the spec covers common SDK behavior - describes client and subscription state transitions, main options and methods. Also check out examples folder.

The features implemented by this SDK can be found in SDK feature matrix.

Example

  • example\flutter_app simple chat application
  • example\chat_app one more chat example
  • example\console simple console application
  • example\console_server_subs demonstrates working with server-side subscriptions

Usage in background

When a mobile application goes to the background there are OS-specific limitations for established persistent connections - which can be silently closed shortly. Thus in most cases you need to disconnect from a server when app moves to the background and connect again when app goes to the foreground.

Instructions for maintainers/contributors

How to update protobuf definitions

  1. Install protoc compiler
  2. Install protoc_plugin https://pub.dev/packages/protoc_plugin (dart pub global activate protoc_plugin)
  3. cd lib/src/proto and run protoc --dart_out=. -I . client.proto
  4. cd to root and run dartfmt -w lib/ test/ (install dartfmt with dart pub global activate dart_style)

How to release

  1. Update changelog
  2. Bump version in pubspec.yaml, push, create new tag
  3. pub publish

Author

German Saprykin, saprykin.h@gmail.com

Changelog

[0.9.0]

Breaking changes

This release adopts a new iteration of Centrifugal protocol and a new iteration of API. Client now behaves according to the client SDK API specification. The work has been done according to Centrifugo v4 roadmap.

Check out Centrifugo v4 release post that covers the reasoning behind changes.

All the current core features of Centrifugal client protocol are now supported here.

New release only works with Centrifugo >= v4.0.0 and Centrifuge >= 0.25.0. See Centrifugo v4 migration guide for details about the changes in the ecosystem.

Note, that Centrifugo v4 supports clients working over the previous protocol iteration, so you can update Centrifugo to v4 without any changes on the client side (but you need to turn on use_client_protocol_v1_by_default option in the configuration of Centrifugo, see Centrifugo v4 migration guide for details).

[0.8.0]

Version 0.8.0 is the next iteration of centrifuge-dart development. It pushes client closer to other clients in the ecosystem. It also contains several backwards incompatible changes.

  • Return Futures from Client.connect, Client.disconnect, Subscription.subscribe, Subscription.unsubscribe methods - addresses #31.
  • On initial connect fire DisconnectEvent on connection error - this makes behavior of centrifuge-dart similar to all other our clients - addresses #56.
  • Add client error stream to consume ErrorEvent - each transport failure will emit error to this stream - addresses #56.
  • Refactor subscription statuses - add subscribing and error statuses. This change is mostly internal should not affect working with Subscriptions.
  • Do not call UnsubscribeEvent if subscription is not successfully subscribed (i.e. in subscribed state). This makes behavior of centrifuge-dart similar to all other our clients.
  • Update disconnect reasons due to failed connection and calling Client.Disconnect method - make it more similar to all other connector libraries in ecosystem.
  • Add default transport timeout (10 sec) – on connect and subscribe timeouts client will auto reconnect, calls like publish, history, rpc can now throw TimeoutException. Also - properly pass timeout to the transport (was not before!). Again – this makes client behave similarly to all other connectors.
  • Add presence and presenceStats methods for Subscription and on client top level (for server-side subscriptions).
  • Support streamPosition in SubscribeSuccessEvent.
  • Support streamPosition in ServerSubscribeEvent.
  • Support data in ServerSubscribeEvent.
  • Implement send method to send async messages to a server.
  • Fix deletion during iteration over map when working with server-side subscriptions.
  • Better event String representations.
  • Improvements and fixes in examples.

[0.7.1]

  • Add support for data in SubscribeSuccessEvent. This is a custom data which can be sent by a server towards client connection in subscribe result. Note that due to the bug in Centrifugo server this feature only works in Centrifugo >= v3.0.3.

[0.7.0]

Update to work with Centrifuge >= v0.18.0 and Centrifugo v3.

Breaking change in server behavior. Client History API behavior changed in Centrifuge >= v0.18.0 and Centrifugo >= v3.0.0. When using history call it won't return all publications in a stream by default. See Centrifuge v0.18.0 release notes or Centrifugo v3 migration guide for more information and workaround on server-side.

  • Protocol definitions updated to the latest version
  • History method now accepts optional limit, since and reverse arguments and returns HistoryResult
  • RPC call now requires method name as first argument (you can pass empty string to mimic previous behavior)
  • Publish now returns PublishResult
  • When working with Centrifugo v3 or Centrifuge >= v0.18.0 it's now possible to avoid using ?format=protobuf in connection URL. Client will negotiate Protobuf protocol with a server using WebSocket subprotocol mechanism (in request headers).

[0.6.0]

Null safety migration

  • library dependencies updated to null safe versions
  • library code updated to support null safety in places where required

See issue #47 and pull request #48 for details.

[0.5.1]

  • Skip handling for events from server-side subscriptions resulted in null pointer dereference

[0.5.0]

  • Update protobuf dependency to ^1.0.1, thanks @Holofox

[0.4.1]

  • Implement removeSubscription method, thanks @tiamo

[0.4.0]

  • Breaking changes connected property removed

[0.3.0]

  • Breaking changes Changed API to avoid returning futures where they do not make sense – in connect and subscribe methods.
  • Client now uses Websocket Ping/Pong frames to find broken connection
  • Support for private channel subscription using onPrivateSub configuration callback function
  • Fix several null pointer dereferences in edge cases, throw ClientDisconnectedError when there is an attempt to send protocol request over non-connected client.
  • Fix examples where subscribe could happen before stream handlers set

[0.2.0]

  • Breaking changes Replaced subscribe method with getSubscription in Client.
  • Added reconnection.
  • Added history method to Subscription. Thanks vanelizarov.
  • Added rpc method.

[0.1.0]

  • Added authorization with JWT
  • Added subscription to private channel with JWT

[0.0.1]

  • Initial release

Installing

export PUB_HOSTED_URL=https://pub.mirror.p-hatan.ir
flutter pub add 'centrifuge:0.9.0'
pubspec.yaml
name: centrifuge
version: 0.9.0

description: >
  Dart client to communicate with Centrifuge and Centrifugo from Flutter and VM over dart:io WebSocket

homepage: http://github.com/centrifugal/centrifuge-dart

environment:
 sdk: '>=2.12.0 <3.0.0'

dependencies:
 meta: ^1.3.0
 protobuf: ^2.0.0
 fixnum: ^1.0.0

dev_dependencies:
  test: ^1.17.4
  mockito: ^5.0.7
  build_runner: ^2.0.3

Version history

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0.0.1Cached · Upstream SHA-256 matchedDownloaddb3faacd…bd6395
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Dependencies

fixnum "^1.0.0"

meta "^1.3.0"

protobuf "^2.0.0"