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Macula HTTP/3 Mesh SDK — connect, subscribe, publish, call, advertise
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src/macula_membership_system/README.md
# Macula Membership Subsystem
This directory contains all modules related to the SWIM-based membership and failure detection subsystem.
## Overview
The membership subsystem implements:
- SWIM protocol for failure detection
- Gossip-based membership propagation
- Node health monitoring
- Membership list management
- Failure detection with configurable timeouts
## Modules
| Module | Purpose |
|--------|---------|
| `macula_membership_list.erl` | Membership list management (alive, suspect, dead nodes) |
| `macula_membership_gossip.erl` | Gossip protocol for membership updates |
| `macula_membership_detector.erl` | Failure detection using SWIM pings |
| `macula_membership_member.erl` | Individual member state and metadata |
## Architecture
```
┌─────────────────────────────────────────────────┐
│ macula_membership_list │
│ (gen_server) │
└──────────────────────┬──────────────────────────┘
│
┌───────────────┼───────────────┐
│ │ │
┌──────▼──────┐ ┌──────▼──────┐ ┌──────▼──────┐
│ detector │ │ gossip │ │ member │
│ (SWIM ping) │ │ (propagate) │ │ (state) │
└─────────────┘ └─────────────┘ └─────────────┘
```
## SWIM Protocol
The Scalable Weakly-consistent Infection-style Membership (SWIM) protocol:
1. **Direct Ping**: Probe random member
2. **Indirect Ping**: If direct fails, ask other members to probe
3. **Suspect**: Mark unresponsive nodes as suspect
4. **Dead**: After timeout, mark suspect nodes as dead
## Message Types
| Type | ID | Purpose |
|------|-----|---------|
| SWIM_PING | 0x30 | Direct health check |
| SWIM_ACK | 0x31 | Response to ping |
| SWIM_PING_REQ | 0x32 | Indirect ping request |
## Member States
```
┌─────────┐ timeout ┌──────────┐ timeout ┌──────┐
│ ALIVE │─────────→│ SUSPECT │──────────→│ DEAD │
└────┬────┘ └────┬─────┘ └──────┘
│ │
│◄───────────────────┘
ACK received
```
## Configuration
| Key | Default | Description |
|-----|---------|-------------|
| `ping_interval` | 1000 | Ping interval (ms) |
| `ping_timeout` | 500 | Ping timeout (ms) |
| `suspect_timeout` | 3000 | Time before suspect → dead (ms) |
| `indirect_ping_count` | 3 | Members to ask for indirect ping |
## Usage
### Add a member
```erlang
macula_membership_list:add_member(ListPid, MemberInfo).
```
### Check membership
```erlang
Members = macula_membership_list:get_alive_members(ListPid).
```
### Get member state
```erlang
{ok, State} = macula_membership_list:get_member_state(ListPid, NodeId).
%% State :: alive | suspect | dead
```
## Integration
The membership subsystem integrates with:
- **Routing System**: Updates routing table when members change
- **Gateway System**: Tracks connected peers
- **DHT**: Node discovery and routing
## Tests
See: `test/macula_membership_system/`
Run membership tests:
```bash
rebar3 eunit --module=macula_membership_list_tests
rebar3 eunit --module=macula_membership_detector_tests
```