AXON Rust Native Runtime (v1.0.0)

The compiled Rust implementation of the AXON cognitive language with 282 HTTP routes, 47/47 cognitive primitives, and production-grade systems:

• Observability: Structured JSON logging with request tracing (Phase K)
• Resilience: Circuit breakers, exponential backoff, fallback chains (Phase K)
• Persistence: PostgreSQL backend with 12 domain tables and embedded migrations (Phase K)

Directory Structure

axon-rs/
├── Cargo.toml              # Rust dependencies & metadata
├── src/
│   ├── main.rs             # Server entry point (AxonServer)
│   ├── lib.rs              # Public module exports (11 Phase K modules)
│   ├── axon_server.rs      # HTTP server & route handlers (282 routes)
│   ├── backend.rs          # LLM backend calls (7 providers)
│   ├── compiler/           # IR compilation to backend prompts
│   ├── executor/           # Flow execution engine
│   ├── logging.rs          # Tracing subscriber configuration (K1)
│   ├── request_tracing.rs  # Tower middleware for request ID correlation (K1)
│   ├── backend_error.rs    # Error classification & retry logic (K2)
│   ├── retry_policy.rs     # Exponential backoff with jitter (K2)
│   ├── circuit_breaker.rs  # Per-provider state machine (K2)
│   ├── resilient_backend.rs # Composition layer (K2)
│   ├── storage.rs          # StorageBackend trait & dispatcher (K3)
│   ├── storage_postgres.rs # PostgreSQL implementation (K4)
│   ├── db_pool.rs          # Connection pool management (K4)
│   └── migrations.rs       # Embedded migration runner (K4)
├── migrations/
│   ├── 001_initial_schema.sql     # 12 tables (traces, sessions, daemons, etc.)
│   └── 002_indexes.sql            # 15 performance indexes
├── tests/
│   └── integration.rs      # End-to-end tests (753 total)
└── README.md               # This file

Build

Release Build

cd axon-rs
cargo build --release

Binary: target/release/axon (or axon.exe on Windows)

Development Build

cargo build

Binary: target/debug/axon

Run

In-Memory Storage (Development)

cargo run --release -- --port 3000

Logs to stdout, no persistence.

With PostgreSQL (Production)

# Create database
createdb axon

# Run with persistence & structured logging
DATABASE_URL="postgresql://user:pass@localhost/axon" \
cargo run --release -- \
  --port 3000 \
  --log-format json \
  --log-file ./logs \
  --database-url "$DATABASE_URL"

Options:

• --port — HTTP server port (default: 3000)
• --log-format — json or pretty (default: pretty)
• --log-file — Directory for daily-rotated logs
• --database-url — PostgreSQL connection string; if unset, uses in-memory storage

Quick Test

# Health check
curl http://localhost:3000/v1/health

# Deploy a flow
curl -X POST http://localhost:3000/v1/deploy \
  -H "Content-Type: application/json" \
  -d '{"source": "flow test { step reason { prompt: \"hello\" } }", "backend": "stub"}'

# Execute
curl -X POST http://localhost:3000/v1/execute/test

Tests

# Full test suite (1,466 tests)
cargo test

# Specific test groups
cargo test test_k5_          # Phase K tests only (15 tests)
cargo test --lib            # Unit tests (713 tests)
cargo test --test integration # Integration tests (753 tests)

# With output
cargo test -- --nocapture

All tests pass with zero failures. Tests work with in-memory storage (no DB required).

Phase K Features

K1: Observability

• tracing subscriber: JSON or pretty formatting to stdout
• Request tracing: UUID request_id per request, propagated in x-request-id header
• Log rotation: Daily files via tracing-appender
• Configurable levels: Via AXON_LOG env or --log-level CLI

K2: Resilience

• Exponential backoff: 500ms base, 2.0x multiplier, 30s max, deterministic jitter
• Circuit breaker: Per-provider state machine (5 failures → Open, 30s cooldown, 2 successes → Closed)
• Fallback chains: e.g., anthropic → openrouter → ollama
• Error classification: Determines if errors are retryable or terminal
• Supports 7 backends: Anthropic, OpenAI, Gemini, Kimi, GLM, OpenRouter, Ollama

K3-K4: Persistence

• PostgreSQL backend: Full ACID semantics with embedded migrations
• 12 domain tables: traces, sessions, daemons, audit_log, axon_stores, dataspaces, hibernations, event_history, execution_cache, cost_tracking, schedules, backend_registry
• 15 indexes: Query optimization
• UPSERT semantics: Idempotent writes
• JSONB storage: Nested structures without extra joins
• In-memory fallback: Graceful degradation when DB unavailable

Troubleshooting

Database connection fails

Without DATABASE_URL set, the server automatically falls back to in-memory storage. Check logs for details:

RUST_LOG=debug cargo run --release -- --port 3000

Compilation error: "could not compile"

Ensure you have Rust 1.70+:

rustup update
cargo clean
cargo build --release

Performance: slow requests

Check database pool status via /v1/health. If pool is exhausted, increase max_connections in db_pool.rs or reduce concurrent requests.

Dependencies (Phase K)

• tokio — async runtime
• axum — HTTP framework
• sqlx — runtime SQL queries (no compile-time macros needed)
• tracing, tracing-subscriber, tracing-appender — structured logging
• uuid — request IDs
• chrono — timestamps
• And 30+ others (see Cargo.toml)

For Complete Documentation

See the main README.md at the project root for:

• Language specification
• Paradigm shifts (epistemic directives, forge, agent, shield, etc.)
• Design principles and comparison
• Full roadmap (Phases 0–K)