GoAkt Examples

Examples for GoAkt v4. For the stable v3.14 examples, see the v3 branch.

Getting Started

git clone https://github.com/Tochemey/goakt-examples
cd goakt-examples

Build all examples (requires Earthly):

earthly +all

Examples Overview

Core Concepts

• goakt-hello-world — Minimal actor system: spawn an actor, send messages, graceful shutdown
• goakt-ping-pong — Actor-to-actor messaging: two actors exchanging messages (Tell pattern)
• goakt-behaviors — Stateful behaviors: actor with multiple states (authenticated, logged-in) and state transitions
• goakt-parent-child — Parent/child hierarchy: spawn children from inside an actor, observe Terminated
• goakt-supervision — Supervision directives: Stop, Resume, Restart side-by-side with retry budgets
• goakt-routers — Actor pools/routers: round-robin, fan-out, consistent-hash; runtime pool resize
• goakt-pubsub — Topic-based pub/sub via WithPubSub() and the system TopicActor
• goakt-scheduler — Scheduling messages: ScheduleOnce, recurring Schedule, cancellation by reference
• goakt-dead-letters — Subscribing to the system event stream to observe unhandled messages

Remoting & Location Transparency

• goakt-remoting — Actor remoting: Ping and Pong actors on separate processes, communicating over the network
• goakt-cluster/dynalloc — Location transparency: actors can live on any node; cluster routes messages automatically

Clustering & Discovery

• goakt-cluster/static — Static peer discovery: cluster nodes configured via fixed addresses
• goakt-cluster/dnssd — DNS-SD discovery: nodes discover each other via mDNS/DNS (protobuf messages)
• goakt-cluster/dnssd-v2 — DNS-SD + Go types: same as dnssd but with standard Go structs and PostgreSQL persistence
• goakt-cluster/k8s — Kubernetes discovery: cluster on K8s using the API to discover pods (gRPC, protobuf)
• goakt-luster/k8s-v2 — Production-ready K8s cluster: Go types, HTTP/JSON API, PostgreSQL persistence, OpenTelemetry tracing
• goakt-cluster/k8s-ebpf — k8s-v2 + eBPF: zero-instrumentation actor-level tracing via goakt-ebpf sidecar
• goakt-cluster/multi-dc — Multi-datacenter: two DCs (us-east-1, eu-west-1) with NATS JetStream control plane, cross-DC actor placement via SpawnOn + WithDataCenter, NATS discovery
• goakt-cluster/multi-dc-isolated — Multi-datacenter (network isolation): same as multi-dc but with two separate Kind clusters on a shared Docker network, simulating real network boundaries between DCs

Persistence & Extensions

• goakt-persistence — Persistence extension: actor state snapshots to a pluggable store (in-memory example)

Grains (Virtual Actors)

• goakt-grains — Grains model: virtual actors with automatic activation and passivation
• goakt-iot-twin — Device twins as grains: on-demand activation per device, idle passivation, state restored on reactivation
• goakt-grains-cluster/grains-dnssd — Grains clustering: grains across multiple nodes with DNS-SD discovery

Reactive Streams

• goakt-stream — Reactive streams: backpressure-aware pipelines with Sources, Flows, Sinks, fan-out/fan-in topologies, parallel processing, and actor integration

Applications

• goakt-chat — Multi-room chat: remoting, room-based messaging, message history (protobuf)
• goakt-chat-v2 — Chat with Go types: same chat app using standard Go structs instead of protobuf
• goakt-saga — Saga pattern: production-like money transfer with compensating transactions, Kubernetes/Kind, Go types only
• goakt-2pc — 2 phase commit pattern: The same production-like money transfer with 2 phase commit pattern, Kubernetes/Kind, Go types only
• goakt-ai — Distributed AI agents: multi-agent system with Orchestrator, Research, Summarizer, Tool agents; OpenAI/Anthropic/Google/Mistral; CLI + load balancer; Kubernetes/Kind
• goakt-game — Browser-playable Tetris: real-time stateful game where every match is a per-WS-connection actor. Demonstrates scheduled-tick game loop, Watch/*Terminated lifecycle cleanup, SpawnSingleton matchmaker, SpawnOn cluster-aware placement, CBOR serializers, and a TypeScript canvas client. Includes a docker compose two-node cluster setup
• goakt-pictograph — Browser-playable multiplayer drawing & guessing (Skribbl.io-style): per-room RoomActor with a Become-driven FSM (waiting → choosing → drawing → roundOver → gameOver), Stash for early guesses, pub/sub topic per room for stroke/chat fan-out (including spectators), PlayerProfileGrain for cross-session stats, and a cluster-wide CRDT PNCounter leaderboard. Same docker compose two-node story as goakt-game
• goakt-scrabble — Browser-playable multiplayer Scrabble (2–4 humans + bots, English): per-room RoomActor with a turn-based Become FSM (waiting → playing → gameOver), pure-Go Scrabble engine (DAWG dictionary, premium-square scoring, Appel/Jacobson move generator) wrapped in actors, child BotActor per AI seat using ScheduleOnce for a thinking delay, system Extensions for shared per-language dictionaries, and a per-(player, language) CRDT PNCounter leaderboard. Vanilla-TS SVG board client