Add waterfall streaming functionality with tests and linting fixes #247
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lucaspar
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Pull request overview
This PR implements on-demand streaming functionality for waterfall visualizations, eliminating lengthy preprocessing times by computing FFTs in real-time as needed. The implementation adds a caching layer with intelligent prefetching to ensure smooth user experience.
Changes:
- Added streaming API endpoints (
waterfall_metadata_streamandwaterfall_slices_stream) that compute FFT on-demand without preprocessing - Implemented persistent DRF file caching in
MEDIA_ROOT/drf_cacheto avoid repeated downloads from MinIO - Added JavaScript components for LRU slice caching (
WaterfallSliceCache) and intelligent batch loading with retry logic (WaterfallSliceLoader)
Reviewed changes
Copilot reviewed 16 out of 16 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
gateway/sds_gateway/visualizations/processing/waterfall.py |
Added on-demand slice computation functions and fixed FFT shift bug for correct frequency display |
gateway/sds_gateway/visualizations/processing/utils.py |
Implemented persistent DRF cache with helper functions for cache lookup and reconstruction |
gateway/sds_gateway/api_methods/views/capture_endpoints.py |
Added three new endpoints: waterfall_slices, waterfall_metadata_stream, waterfall_slices_stream with validation |
gateway/sds_gateway/api_methods/tests/test_capture_endpoints.py |
Added comprehensive tests for waterfall_slices endpoint covering authentication, validation, and edge cases |
gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallSliceCache.js |
New LRU cache implementation for waterfall slices with eviction policies |
gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallSliceLoader.js |
New API loader with batching, retry logic, request deduplication, and debouncing |
gateway/sds_gateway/static/js/visualizations/waterfall/__tests__/WaterfallSliceLoader.test.js |
Comprehensive Jest tests for slice loader covering all major functionality |
gateway/sds_gateway/static/js/visualizations/waterfall/__tests__/WaterfallSliceCache.test.js |
Jest tests for cache implementation including LRU eviction and edge cases |
gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallVisualization.js |
Integrated streaming mode with fallback to preprocessed data, added loading states and prefetching |
gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallRenderer.js |
Added loading placeholder rendering for missing slices during streaming |
gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallControls.js |
Added loading state management for scroll buttons |
gateway/sds_gateway/static/js/visualizations/waterfall/PeriodogramChart.js |
Fixed frequency axis calculation to include center frequency offset |
gateway/sds_gateway/static/js/visualizations/waterfall/constants.js |
Added cache, batch, and prefetch strategy constants |
gateway/sds_gateway/static/js/visualizations/waterfall/index.js |
Added imports for new cache and loader modules |
gateway/sds_gateway/context_processors.py |
Added context processor to expose VISUALIZATIONS_ENABLED setting |
gateway/config/settings/base.py |
Registered new context processor |
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gateway/sds_gateway/static/js/visualizations/waterfall/constants.js
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gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallVisualization.js
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gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallSliceLoader.js
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gateway/sds_gateway/static/js/visualizations/waterfall/__tests__/WaterfallSliceLoader.test.js
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gateway/sds_gateway/static/js/visualizations/waterfall/WaterfallVisualization.js
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Summary
Implements on-demand streaming for waterfall visualizations, eliminating the need for lengthy preprocessing times. Added test
https://crc-dev.atlassian.net/jira/software/c/projects/SFDS/boards/87?selectedIssue=SFDS-280