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Macula HTTP/3 Mesh SDK — connect, subscribe, publish, call, advertise
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src/macula_peer_system/README.md
# Macula Peer Subsystem
This directory contains all modules related to peer-to-peer connection management.
## Overview
The peer subsystem provides:
- Direct P2P QUIC connections between nodes
- Fire-and-forget connection establishment
- Connection pooling integration
- NAT traversal coordination
## Modules
| Module | Purpose |
|--------|---------|
| `macula_peer_connector.erl` | Fire-and-forget P2P QUIC connections |
| `macula_peer_system.erl` | Peer subsystem supervisor |
| `macula_peer_connection_pool.erl` | Connection pool with LRU eviction |
## Architecture
```
┌─────────────────────────────────────────────────┐
│ macula_peer_system │
│ (supervisor) │
└──────────────────────┬──────────────────────────┘
│
┌───────────────┼───────────────┐
│ │ │
┌──────▼──────┐ ┌──────▼──────┐ ┌──────▼──────┐
│ peer_conn_ │ │ connector │ │ NAT │
│ pool │ │ (outbound) │ │ traversal │
└─────────────┘ └─────────────┘ └─────────────┘
```
## Connection Flow
### Outbound Connection (peer_connector)
```
1. Request connection to endpoint
2. Check connection pool for existing connection
3. If not found:
a. Try direct QUIC connect
b. If NAT blocked, coordinate hole punch
c. If punch fails, use relay
4. Cache connection in pool
5. Send message
```
### Connection Pool
```
Pool State:
┌─────────────────────────────────────┐
│ endpoint → {connection_pid, last_used} │
│ ... │
│ Max: 1000 connections (LRU evicted) │
└─────────────────────────────────────┘
```
## Usage
### Send message to peer
```erlang
%% Fire-and-forget - returns immediately
macula_peer_connector:send_to_peer(Endpoint, MessageType, Message).
%% With options
macula_peer_connector:send_to_peer(Endpoint, MessageType, Message, #{
timeout => 5000,
retry => 1
}).
```
### Pool operations
```erlang
%% Get pooled connection
case macula_peer_connection_pool:get(Endpoint) of
{ok, ConnPid} -> use_connection(ConnPid);
not_found -> establish_new()
end.
%% Add to pool
macula_peer_connection_pool:put(Endpoint, ConnPid).
%% Pool stats
Stats = macula_peer_connection_pool:get_stats().
%% => #{size => 450, hits => 9450, misses => 550, hit_rate => 0.945}
```
## NAT Traversal Integration
The peer connector integrates with the NAT traversal subsystem:
1. **Detection**: NAT type detected on startup
2. **Hole Punching**: Coordinated via bootstrap node
3. **Relay Fallback**: If direct fails, use relay
See `src/macula_nat_system/` for NAT traversal details.
## Configuration
| Key | Default | Description |
|-----|---------|-------------|
| `pool_max_size` | 1000 | Max pooled connections |
| `connect_timeout` | 5000 | Connection timeout (ms) |
| `idle_timeout` | 300000 | Close idle connections after (ms) |
## Tests
See: `test/macula_peer_system/`
Run peer tests:
```bash
rebar3 eunit --module=macula_peer_connector_tests
rebar3 eunit --module=macula_peer_connection_pool_tests
```