shopify-ai-backup/CONTAINER_HEALTH_FIXES_SUMMARY.md

Container Health Fixes - Implementation Summary

Overview

This PR addresses three critical issues that were causing container health failures and functionality problems.

Issues Fixed

1. Tracking Error: "uniqueVisitors.add is not a function" ✅

Problem: The application was logging repeated errors:

[2026-01-12T08:26:20.032Z] Tracking error {"error":"TypeError: trackingData.summary.dailyVisits[dateKey].uniqueVisitors.add is not a function"}

Root Cause: When tracking data was persisted to JSON and loaded back, the dailyVisits[dateKey].uniqueVisitors Sets were serialized as arrays. On reload, they remained as arrays instead of being converted back to Sets, causing .add() method calls to fail.

Solution:

• Modified loadTrackingData() (lines 1055-1098) to iterate through dailyVisits and convert uniqueVisitors arrays back to Sets
• Modified persistTrackingData() (lines 1100-1124) to explicitly serialize Sets to arrays before JSON stringification
• Simplified conditional logic per code review feedback

Files Changed:

• chat/server.js (lines 1055-1124)

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2. Invalid URL Error: "TypeError: Invalid URL" ✅

Problem: The application was crashing with errors:

TypeError: Invalid URL
    at new URL (node:internal/url:806:29)
    at route (/opt/webchat/server.js:6853:15)
  code: 'ERR_INVALID_URL',
  input: '//?author=1',

Root Cause: Malformed HTTP requests with URLs like //?author=1 (double leading slashes) caused the native URL constructor to throw unhandled exceptions, crashing request handlers.

Solution:

• Created sanitizeUrl() utility function (lines 1136-1145) to detect and fix URLs starting with //
• Updated route() function (lines 6887-6910) to:
  • Use sanitizeUrl before URL parsing
  • Catch URL parsing errors and return 400 Bad Request
  • Log invalid URLs for monitoring
• Updated trackVisit() function (lines 1137-1153) to:
  • Use sanitizeUrl before URL parsing
  • Gracefully skip tracking on invalid URLs
  • Log skipped tracking attempts

Files Changed:

• chat/server.js (lines 1136-1145, 1147-1153, 6887-6910)

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3. Model Dropdown Not Showing Up ✅

Problem: Users reported that the model dropdown in the builder (/builder) was not displaying any options.

Root Cause: The model dropdown functionality was working correctly, but the system only had 2 test models configured with outdated model identifiers. The dropdown requires properly configured models in admin-models.json to display options.

Solution: Added comprehensive default model configurations with 5 modern, widely-available models:

1. GPT-4o Mini (free tier) - Fast, cost-effective OpenAI model
2. GPT-4o (plus tier) - Latest flagship OpenAI model
3. Claude 3.5 Sonnet (plus tier) - High-performance Anthropic model
4. Claude 3.5 Haiku (free tier) - Fast, efficient Anthropic model
5. Gemini 2.0 Flash (free tier) - Latest Google experimental model

Each model is properly configured with:

• Unique ID and name
• Display label
• CLI type (opencode)
• Provider mapping (openai, anthropic, google)
• Usage tier (free, plus, pro)

Files Changed:

• .data/.opencode-chat/admin-models.json

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Testing

Manual Testing

Created /tmp/test-fixes.js script that validates:

• ✅ Tracking data serialization/deserialization
• ✅ Set operations after deserialization
• ✅ URL sanitization for various edge cases

All tests passed successfully.

Syntax Validation

node -c chat/server.js  # ✅ Passed

Code Review

• Addressed all code review feedback
• Extracted duplicated URL sanitization into shared utility function (DRY principle)
• Simplified conditional logic in loadTrackingData
• Improved documentation and comments

Security Check

codeql_checker  # ✅ No alerts found

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Impact

Before:

• Container health checks failing due to repeated tracking errors
• Application crashes on malformed URL requests
• Model dropdown showing no options for users
• Poor user experience and system instability

After:

• ✅ Tracking system working correctly with proper Set serialization
• ✅ Robust URL handling preventing crashes from malformed requests
• ✅ Model dropdown populated with 5 modern, widely-available models
• ✅ Improved stability and user experience

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Code Quality Improvements

1. DRY Principle: Extracted duplicated URL sanitization logic into shared sanitizeUrl() utility
2. Error Handling: Added comprehensive try-catch blocks and graceful degradation
3. Logging: Enhanced logging for debugging and monitoring
4. Documentation: Added clear comments explaining the purpose of each fix
5. Maintainability: Simplified conditional logic and improved code readability

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Deployment Notes

Configuration Requirements

• Models are configured in .data/.opencode-chat/admin-models.json
• File is loaded at server startup via loadAdminModelStore()
• No environment variables need to be changed

Backward Compatibility

• ✅ All changes are backward compatible
• ✅ Existing tracking data will be properly migrated on load
• ✅ No breaking changes to API endpoints

Monitoring

Watch for these log messages to confirm fixes are working:

• Loaded tracking data - Confirms tracking data loaded with Sets intact
• Invalid URL - Confirms malformed URLs are being handled gracefully
• Tracking skipped - invalid URL - Confirms tracking gracefully handles bad URLs
• Models loaded successfully - Confirms model dropdown will populate

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Related Documentation

• BUILDER_MODEL_DROPDOWN_FIX.md - Detailed investigation of dropdown functionality
• Model configuration schema documented in BUILDER_MODEL_DROPDOWN_FIX.md

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Security Summary

Vulnerabilities Discovered: 0 Vulnerabilities Fixed: 0 Security Scan Results: ✅ Clean (CodeQL found no alerts)

Security Improvements:

• Added input validation for URLs to prevent crashes
• Proper error handling prevents information leakage
• Sanitization applied before URL parsing

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Conclusion

All three issues have been successfully resolved with minimal, surgical changes to the codebase. The fixes improve system stability, enhance error handling, and provide a better user experience. No security vulnerabilities were introduced, and all code quality standards have been maintained.