go-caatsm/README.md

go-caatsm

Civil Aviation Authority Telegram Message Processor.

High-performance processing for aviation telegrams using Clean Architecture, NATS JetStream, and PostgreSQL/TimescaleDB.

Architecture

Clean Architecture with clear separation of concerns:

• cmd: application entry points
• internal/domain: core domain types
• internal/port: interfaces/contracts
• internal/app: application orchestration
• internal/adapter: parsing, mapping, DTOs
• internal/infra: NATS, PostgreSQL, config, logging, metrics, telemetry
• pkg/di: dependency injection (Wire)

Features

• JetStream ingestion with retries and DLQ support
• PostgreSQL/TimescaleDB persistence
• Structured logging (Zap)
• OpenTelemetry tracing and Prometheus metrics
• Optional AFTN protocol validation
• Batch processing and health monitoring
• Weather report parsing (METAR, SPECI, TAF)

Prerequisites

• Go 1.24+
• PostgreSQL 12+
• NATS Server with JetStream enabled
• Docker (integration tests)

Quick Start

1. Start dependencies:

   docker compose -f docker-compose.dev.yml up -d postgres nats nats-box
   

2. Configure the application:

   • Copy configs/config.dev.toml and edit as needed
   • Or set environment variables with the CAATSM_ prefix

3. Run in dev mode:

   make run-dev
   

Build and Run

• Build: make build
• Run (dev): make run-dev
• Run (prod): make run-prod
• Run (local go run): make run-local

Configuration

Configuration loads from configs/config.{env}.toml, where {env} is GO_ENV (default: dev).

Required values:

• nats.url
• postgres.url
• publisher.topic

Defaults:

• nats.stream defaults to TELEGRAM
• subscription.topic defaults to telegram.>
• nats.mode must be jetstream or empty (defaults to JetStream)

Minimal example:

[nats]
url = "nats://localhost:4222"
mode = "jetstream"
stream = "TELEGRAM"
consumer = "telegram-consumer"

[publisher]
topic = "telegram.json"

[subscription]
topic = "telegram.serial"

[postgres]
url = "postgres://user:password@localhost:5432/aviation?sslmode=disable"

[app]
batch_size = 50
batch_timeout = "2s"
monitor_interval = "30s"

[log]
level = "info"
format = "json"

Timeouts and Ack Wait

[timeouts] is optional. To tune redelivery, set timeouts.ack_wait and/or nats.consumer_rules.ack_wait. When neither is specified the application defaults to 30s.

JetStream Notes

• JetStream is required; other modes are not supported.
• In dev/test (GO_ENV=dev or GO_ENV=test), the stream and consumer are auto-created.
• In production, ensure the stream and consumer exist before starting the service.
• Configure retention and delivery behavior under [nats.stream_limits] and [nats.consumer_rules].

AFTN Validation

AFTN validation is optional and disabled by default. Enable it with:

[aftn]
validation_enabled = true
message_gap_threshold = "2m"
enable_sequence_gap_detection = true

When enabled, invalid telegrams are logged, recorded with error details, and can be routed to a DLQ if configured.

Observability

• Metrics: GET /metrics
• Liveness: GET /livez
• Readiness: GET /readyz

Monitoring server settings are under [monitoring]. Tracing is configured via [telemetry].

CLI

./bin/receiver listen --help

Common flags:

• --nats-url
• --subject
• --stream
• --consumer
• --publisher-topic
• --postgres-url
• --log-level
• --replay-from
• --ack-wait
• --telemetry-enabled, --telemetry-endpoint, --telemetry-insecure

Testing

• Unit tests (Ginkgo): make test
• Integration tests (Docker): make test-int
• All tests: make test-all
• Lint: make lint
• Coverage: make coverage

Single test example:

ginkgo -r -v --focus "Test Description" ./path/to/package

Seed Tool

cmd/seed-telegrams publishes synthetic telegrams for development and testing.

Example:

go run ./cmd/seed-telegrams \
  --nats-url nats://localhost:4222 \
  --jetstream \
  --stream TELEGRAM \
  --js-subject telegram.serial \
  --count 10 \
  --category mixed \
  --status random

Documentation

• docs/dev-guide.md
• docs/prod-guide.md
• docs/nats.md
• docs/observability.md
• docs/performance.md
• docs/migrations.md
• docs/secret-management.md
• docs/reliability.md

Contributing

See AGENTS.md for coding standards, testing expectations, and release hygiene.

License

This repository has not declared a public license yet.