azaion/satellite-provider

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Oleksandr Bezdieniezhnykh 51b572108a

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[AZ-484] Cycle 1 Steps 12-16: docs, security, perf, deploy report

Captures the post-implementation autodev gates for AZ-484 multi-source
tile storage:

- Step 12 (Test-Spec Sync): added 7 AC rows (AZ-484 AC-1..AC-7) and a
  PT-07 NFR row to traceability-matrix.md; added PT-07 scenario to
  performance-tests.md.
- Step 13 (Update Docs): refreshed data_model.md (tiles columns +
  indexes + selection rule + UPSERT contract + migrations 012/013),
  module-layout.md (Common/Enums section with L-001 guidance,
  DataAccess imports-from now lists 6 sites), 6 module / component
  docs to reflect the new repo signatures, source/captured_at fields,
  and Dapper enum bypass workaround. ripple_log_cycle1.md records
  zero out-of-scope ripple.
- Step 14 (Security Audit): PASS_WITH_WARNINGS - 0 Critical, 0 High,
  5 Medium, 5 Low. AZ-484 itself added zero new findings. Hardening
  items (Postgres default creds, .env in build context, GMaps key
  rotation, ASP.NET Core 8.0.21 -> 8.0.25, rate limiter) recorded
  for separate tickets.
- Step 15 (Performance Test): all PT-01..PT-07 scenarios Unverified
  (non-blocking); PT-07 baseline-comparison harness deferred to a
  leftover for next cycle.
- Step 16 (Deploy): cycle deploy report covering migration safety,
  rollback path, post-deploy verification, security caveats.

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-05-11 10:03:05 +03:00

3.6 KiB

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Module: Services/TileService

Purpose

Orchestrates tile downloading and persistence. Bridges the downloader (Google Maps) with the tile repository (PostgreSQL), handling in-memory caching, entity creation, and metadata mapping. Single ownership point for all tile read/write business logic — both region-batch and single-tile API endpoints route through this service.

csproj: SatelliteProvider.Services.TileDownloader/TileService.cs

Public Interface

TileService (implements ITileService)

DownloadAndStoreTilesAsync(double lat, double lon, double sizeMeters, int zoomLevel, CancellationToken) → Task<List<TileMetadata>>:
1. Queries existing tiles in the region from the repository — most-recent across sources per (latitude, longitude, tile_zoom, tile_size_meters) (AZ-484 selection rule applied by TileRepository.GetTilesByRegionAsync via DISTINCT ON)
2. Calls ISatelliteDownloader.GetTilesWithMetadataAsync with existing tiles to skip
3. Creates TileEntity for each newly downloaded tile and inserts via repository (per-source UPSERT keyed on (latitude, longitude, tile_zoom, tile_size_meters, source))
4. Returns combined list of existing + new tile metadata
GetTileAsync(Guid id) → Task<TileMetadata?>: single tile lookup
GetTilesByRegionAsync(double lat, double lon, double sizeMeters, int zoomLevel) → Task<IEnumerable<TileMetadata>>: query tiles in a region
GetOrDownloadTileAsync(int z, int x, int y, CancellationToken) → Task<TileBytes> (AZ-310): cache → repository → downloader fallback for single Z/X/Y serving
DownloadAndStoreSingleTileAsync(double latitude, double longitude, int zoomLevel, CancellationToken) → Task<TileMetadata> (AZ-311): download one tile by lat/lon, persist, return metadata

Internal Logic

New rows write Version = null and MapsVersion = null (post-AZ-357 / AZ-373); the version and maps_version columns are retained for backward compatibility with pre-existing rows
AZ-484: BuildTileEntity stamps every newly downloaded row with Source = TileSourceConverter.ToWireValue(TileSource.GoogleMaps) (wire value "google_maps") and CapturedAt = DateTime.UtcNow. The Google Maps download path is the only producer of 'google_maps' rows; UAV ingestion (separate task) is the only producer of 'uav' rows.
MapToMetadata(TileEntity) → TileMetadata: entity-to-DTO mapping (static helper); MapsVersion is no longer projected onto TileMetadata / DownloadTileResponse. Source and CapturedAt are not currently projected to the public DTO (no API contract change observable for AZ-484).
TileSizePixels sourced from MapConfig.TileSizePixels (default 256, post-AZ-371); image type fixed at "jpg"
IMemoryCache keyed by (z, x, y) with 1h absolute / 30min sliding expiration; populated on first hit and on downloader fallback

Dependencies

ISatelliteDownloader (resolved via DI; concrete is GoogleMapsDownloaderV2)
ITileRepository
IMemoryCache (registered by AddTileDownloader())
SatelliteProvider.Common.DTO — GeoPoint, TileMetadata, TileBytes
SatelliteProvider.Common.Enums — TileSource, TileSourceConverter (AZ-484)
SatelliteProvider.DataAccess.Models — TileEntity

Consumers

RegionService.ProcessRegionAsync — downloads and retrieves tiles for a region

Data Models

Transforms between TileEntity (persistence) and TileMetadata (DTO).

Configuration

None directly; relies on GoogleMapsDownloaderV2's configuration.

External Integrations

Indirect: Google Maps (via downloader), PostgreSQL (via repository).

Security

None.

Tests

No dedicated tests.

3.6 KiB Raw Blame History