SWIM WebSocket Phase 2/3 Transition Summary

Last Updated: 2026-01-16 14:00 UTC
Status: Phase 2 COMPLETE ✅ | Phase 3 Python SDK complete

🎉 Phase 2 Complete!

All WebSocket functionality is production-ready:

Session Log (2026-01-16)

Session 3 - Rate Limits + Completion

Completed:

1. Tier-based connection limits in WebSocketServer.php

   • Tracks connectionsByTier counts
   • Enforces limits on connect, decrements on disconnect
   • Rejects with CONNECTION_LIMIT error when at max
   • Shows tier in connect/disconnect logs

2. Tier limits: | Tier | Max Connections | |------|-----------------| | public | 5 | | developer | 50 | | partner | 500 | | system | 10,000 |

3. Documentation updated - All SWIM docs reflect completion

Session 2 - DB Auth + Python SDK

Completed:

1. Database authentication in WebSocketServer.php

   • Validates API keys against dbo.swim_api_keys
   • 5-minute key cache to reduce DB queries
   • Checks is_active and expires_at
   • Updates last_used_at on success

2. Python SDK - sdk/python/swim_client/

   • Async WebSocket client with auto-reconnect
   • Typed event data classes
   • 4 example scripts

3. Poll interval reduced from 500ms to 100ms

Session 1 - Core Deployment

Completed:

• WebSocket server deployed (port 8090)
• Apache proxy configured
• Event detection integrated
• External WSS verified working

Architecture

┌─────────────────┐      ┌─────────────────┐      ┌─────────────────┐
│   ADL Daemon    │─────▶│   Event File    │◀────▶│  WebSocket Hub  │
│  (15s refresh)  │ emit │  (IPC queue)    │ poll │  (Ratchet PHP)  │
└─────────────────┘      └─────────────────┘      └────────┬────────┘
                              100ms polling                │
                                                           │
              ┌────────────────┬───────────────┬───────────┤
              ▼                ▼               ▼           ▼
         ┌────────┐      ┌────────┐      ┌────────┐  ┌────────┐
         │  CRC   │      │  vNAS  │      │SimAware│  │ Custom │
         └────────┘      └────────┘      └────────┘  └────────┘

Phase 3 Status

Redis Decision

Redis ($16/mo) deferred indefinitely. Current file-based IPC:

• 100ms polling interval
• ~50ms average latency added to 15-second cycle (0.3%)
• Deploy Redis only when API caching layer needed

File Reference

Core WebSocket Files

Python SDK Files

Database Reference

swim_api_keys Table

CREATE TABLE dbo.swim_api_keys (
    id INT IDENTITY(1,1) PRIMARY KEY,
    api_key NVARCHAR(64) NOT NULL UNIQUE,
    tier NVARCHAR(20) NOT NULL DEFAULT 'public',
    owner_name NVARCHAR(100) NOT NULL,
    owner_email NVARCHAR(255),
    description NVARCHAR(500),
    expires_at DATETIME2,
    created_at DATETIME2 NOT NULL DEFAULT GETUTCDATE(),
    last_used_at DATETIME2,
    is_active BIT NOT NULL DEFAULT 1
);

Current Keys

Create New Key

INSERT INTO dbo.swim_api_keys (api_key, tier, owner_name, owner_email, description)
VALUES (
    'swim_' + LOWER(CONVERT(VARCHAR(36), NEWID())),
    'developer',
    'Name',
    'email@example.com',
    'Description'
);

Operations Reference

Restart WebSocket Server

pkill -f swim_ws_server
rm -f /home/site/wwwroot/scripts/swim_ws.lock
nohup php /home/site/wwwroot/scripts/swim_ws_server.php --debug > /home/LogFiles/swim_ws.log 2>&1 &

Monitor Logs

tail -f /home/LogFiles/swim_ws.log

Test Python SDK

cd sdk/python
pip install -e .
python examples/basic_example.py swim_dev_hp_test

Event Types

Success Metrics

Next Steps

1. Deploy rate limits - Files need to sync, then restart WS server
2. C#/Java SDKs - Build when consumers request
3. Metrics dashboard - Track usage patterns
4. Redis - Deploy when caching layer needed

Cost Summary