base on Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably. Set up once and forever. Centrifugo is an open-source scalable real-time messaging server. Centrifugo can instantly deliver messages to application online users connected over supported transports (WebSocket, HTTP-streaming, Server-Sent Events (aka EventSource), GRPC, WebTransport). Centrifugo has the concept of channel subscriptions – so it's a user-facing PUB/SUB server. Centrifugo is language-agnostic and can be used to build chat apps, live comments, multiplayer games, real-time data visualizations, collaborative tools, etc. in combination with any backend. It is well suited for modern architectures and allows decoupling the business logic from the real-time transport layer. Several official client SDKs for browser and mobile development wrap the bidirectional protocol. In addition, Centrifugo supports a unidirectional approach for simple use cases with no SDK dependency. ## Documentation * [Centrifugo official documentation site](https://centrifugal.dev) * [Installation instructions](https://centrifugal.dev/docs/getting-started/installation) * [Getting started tutorial](https://centrifugal.dev/docs/getting-started/quickstart) * [Design overview and idiomatic usage](https://centrifugal.dev/docs/getting-started/design) * [Build a WebSocket chat/messenger app with Centrifugo](https://centrifugal.dev/docs/tutorial/intro) tutorial * [Centrifugal blog](https://centrifugal.dev/blog) * [FAQ](https://centrifugal.dev/docs/faq) ## Join community * [Telegram](https://t.me/joinchat/ABFVWBE0AhkyyhREoaboXQ) * [Discord](https://discord.gg/tYgADKx) * [Twitter](https://twitter.com/centrifugalabs) ## Why Centrifugo The core idea of Centrifugo is simple – it's a PUB/SUB server on top of modern real-time transports: <img src="https://centrifugal.dev/img/protocol_pub_sub.png?v=2" /> The hard part is to make this concept production-ready, efficient, flexible and available from different application environments. Centrifugo is a mature solution that already helped many projects with adding real-time features and scale towards many concurrent connections. Centrifugo provides a set of features not available in other open-source solutions in the area: * Efficient real-time transports: WebSocket, HTTP-streaming, Server-Sent Events, GRPC, WebTransport * Built-in scalability with Redis (or Redis Cluster, or Redis-compatible storage – ex. AWS Elasticache, Valkey, KeyDB, DragonflyDB, etc), or Nats. * Simple HTTP and GRPC server API to communicate with Centrifugo from the app backend * Asynchronous PostgreSQL and Kafka consumers to support transactional outbox and CDC patterns * Flexible connection authentication mechanisms: JWT and proxy-like (via request from Centrifugo to the backend) * Channel subscription multiplexing over a single connection * Different types of subscriptions: client-side and server-side * Various channel permission strategies, channel namespace concept * Hot message history in channels, with automatic message recovery upon reconnect, cache recovery mode (deliver latest publication immediately upon subscription) * Delta compression in channels based on Fossil algorithm * Online channel presence information, with join/leave notifications * A way to send RPC calls to the backend over the real-time connection * Strict and effective client protocol wrapped by several official SDKs * JSON and binary Protobuf message transfer, with optimized serialization and built-in batching * Beautiful embedded admin web UI * Great observability with lots of Prometheus metrics exposed and official Grafana dashboard * And much more, visit [Centrifugo documentation site](https://centrifugal.dev) ## Backing This repository is hosted by [packagecloud.io](https://packagecloud.io/). <a href="https://packagecloud.io/"><img height="46" width="158" alt="Private NPM registry and Maven, RPM, DEB, PyPi and RubyGem Repository · packagecloud" src="https://packagecloud.io/images/packagecloud-badge.png" /></a> Also thanks to [JetBrains](https://www.jetbrains.com/) for supporting OSS (most of the code here written in Goland): <a href="https://www.jetbrains.com/"><img height="140" src="https://resources.jetbrains.com/storage/products/company/brand/logos/jb_beam.png" alt="JetBrains logo"></a> ", Assign "at most 3 tags" to the expected json: {"id":"12852","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"