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

Task	Est. Hours	Status
Python SDK	12h	✅ DONE
Redis IPC	4-6h	⏸️ Deferred
C# SDK	12h	⏳ As needed
Java SDK	12h	⏳ As needed
Message compression	2h	⏳ Low priority
Historical replay	8h	⏳ Low priority
Metrics dashboard	4h	⏳ Low priority

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