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Add centralized retry/fallback policy with hard-coded endpoints

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Extract duplicated retry logic from OverpassService and RoutingService
into a shared resilience framework in service_policy.dart:

- ResiliencePolicy: configurable retries, backoff, and HTTP timeout
- executeWithFallback: retry loop with primary→fallback endpoint chain
- ErrorDisposition enum: abort / fallback / retry classification
- ServicePolicy + ServicePolicyResolver: per-service compliance rules
  (rate limits, caching, concurrency) for OSMF and third-party services
- ServiceRateLimiter: async semaphore-based concurrency and rate control

OverpassService now hits overpass.deflock.org first, falls back to
overpass-api.de. RoutingService hits api.dontgetflocked.com first,
falls back to alprwatch.org. Both use per-service error classifiers
to determine retry vs fallback vs abort behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Doug Borg
2026-03-11 23:13:52 -06:00
co-authored by Claude Opus 4.6
parent 4d1032e56d
commit 2833906c68
8 changed files with 968 additions and 270 deletions
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lib/dev_config.dart
-3
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@@ -64,9 +64,6 @@ const Duration kChangesetCloseMaxRetryDelay = Duration(minutes: 5); // Cap at 5
const Duration kChangesetAutoCloseTimeout = Duration(minutes: 59); // Give up and trust OSM auto-close
const double kChangesetCloseBackoffMultiplier = 2.0;
// Navigation routing configuration
const Duration kNavigationRoutingTimeout = Duration(seconds: 90); // HTTP timeout for routing requests
// Overpass API configuration
const Duration kOverpassQueryTimeout = Duration(seconds: 45); // Timeout for Overpass API queries (was 25s hardcoded)