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Macula HTTP/3 Mesh SDK — connect, subscribe, publish, call, advertise
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src/macula_pubsub_system/README.md
# Macula PubSub Subsystem
This directory contains all modules related to the publish/subscribe messaging subsystem.
## Overview
The PubSub subsystem provides:
- Topic-based publish/subscribe messaging
- DHT-based subscriber discovery
- Multiple QoS levels (0, 1, 2)
- Message retention support
- Wildcard topic matching
- Delivery metrics and monitoring
## Modules
| Module | Purpose |
|--------|---------|
| `macula_pubsub_handler.erl` | Main pub/sub handler - manages subscriptions and publishes |
| `macula_pubsub_server.erl` | Gen_server for pub/sub operations |
| `macula_pubsub_dht.erl` | DHT integration for subscriber discovery |
| `macula_pubsub_discovery.erl` | Subscriber endpoint discovery |
| `macula_pubsub_delivery.erl` | Message delivery with metrics tracking |
| `macula_pubsub_routing.erl` | Multi-hop message routing |
| `macula_pubsub_subscription.erl` | Subscription management |
| `macula_pubsub_topic.erl` | Topic validation and wildcard matching |
| `macula_pubsub_qos.erl` | Quality of service implementation |
| `macula_pubsub_cache.erl` | Subscriber cache for performance |
| `macula_pubsub_registry.erl` | Local subscription registry |
## Architecture
```
┌─────────────────────────────────────────────────┐
│ macula_pubsub_handler │
│ (gen_server) │
└──────────────────────┬──────────────────────────┘
│
┌───────────────┼───────────────┐
│ │ │
┌──────▼──────┐ ┌──────▼──────┐ ┌──────▼──────┐
│ pubsub_dht │ │ pubsub_cache │ │pubsub_topic │
│ (discovery) │ │ (LRU) │ │ (matching) │
└─────────────┘ └─────────────┘ └─────────────┘
│
▼
┌─────────────┐
│ DHT/ │
│ routing_ │
│ server │
└─────────────┘
```
## Message Flow
### Subscribe
```
1. Client sends SUBSCRIBE(topic)
2. Handler registers local subscription
3. Advertisement stored in DHT: topic → {node_id, endpoint}
4. DHT propagates to k=20 closest nodes
```
### Publish
```
1. Publisher sends PUBLISH(topic, payload)
2. Handler queries DHT for subscribers
3. For each subscriber:
- Direct QUIC connection (via peer_connector)
- Send pubsub_route message
4. Track delivery metrics
```
## QoS Levels
| Level | Description |
|-------|-------------|
| 0 | At most once (fire-and-forget) |
| 1 | At least once (with ACK) |
| 2 | Exactly once (four-way handshake) |
## Topic Wildcards
| Pattern | Matches |
|---------|---------|
| `+` | Single level: `sensor/+/temp` matches `sensor/1/temp` |
| `#` | Multi-level: `sensor/#` matches `sensor/1/temp/celsius` |
## Delivery Metrics
The delivery module tracks:
- Messages sent/received
- Delivery success/failure rates
- Latency percentiles
- Retry counts
Access metrics via:
```erlang
macula_pubsub_delivery:get_metrics().
```
## Configuration
| Key | Default | Description |
|-----|---------|-------------|
| `pubsub_cache_size` | 10000 | Max cached subscribers |
| `pubsub_cache_ttl` | 300 | Cache TTL in seconds |
| `default_qos` | 0 | Default QoS level |
## Tests
See: `test/macula_pubsub_system/`
Run pubsub tests:
```bash
rebar3 eunit --module=macula_pubsub_handler_tests
rebar3 eunit --module=macula_pubsub_delivery_tests
rebar3 eunit --module=macula_pubsub_topic_tests
```