feat: implement data delta transmission for Mesh v2 #81
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- Only send data items that have actually changed since the last successful transmission - Reduces the number of mutations and payload size for better cost-effectiveness - Added unit tests to verify delta transmission logic Part of #79 (Phase 2) Co-Authored-By: Gemini <noreply@google.com>
- Removed unused 'maxPerSecond' from RateLimiter - Added interval logging for Mesh v2 timers (data update, event batch, heartbeat, periodic sync) - Updated unit tests to match RateLimiter constructor changes Co-Authored-By: Gemini <noreply@google.com>
- Added MESH_PERIODIC_DATA_SYNC_INTERVAL_MS environment variable - Default and production value set to 15000ms (15 seconds) - Updated MeshV2Service to use the new environment variable - Updated .env.example Part of #79 Co-Authored-By: Gemini <noreply@google.com>
- Introduced latestQueuedData to track the most recent data sent to RateLimiter - Added final delta check in _reportData to skip mutations if data matches lastSentData - Added reproduction unit tests to verify the fix Co-Authored-By: Gemini <noreply@google.com>
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Summary
This PR implements data delta transmission for Mesh v2 (Phase 2 of #79) to reduce infrastructure costs.
Implementation Details
MeshV2Service.sendDatato filter out items that haven't changed since the last successful transmission.lastSentDatain_reportDataonly after a successful mutation.Test Coverage
test/unit/extension_mesh_v2_delta.jswith comprehensive test cases:sendDatacalls common inindex.js.Cost Impact
This change is expected to reduce AppSync mutation costs by 50-70% in typical usage scenarios where many variables are registered but only few change frequently.
Part of #79
Co-Authored-By: Gemini noreply@google.com