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>
Create UserAgentClient (http.BaseClient wrapper) that injects a
User-Agent header into every request, reading app name and version
from VersionService and contact/homepage from dev_config.dart.
Format follows OSM tile usage policy:
DeFlock/<version> (+https://deflock.org; contact: admin@stopflock.com)
Replaces 4 inconsistent hardcoded UA strings and adds UA to the 9
call sites that previously sent none.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Switch the second Overpass pass (ways/relations) from out meta to out skel,
dropping unused tags/version/changeset fields from the response. The app only
reads structural references (node lists, relation members) from these elements.
Also inject http.Client into OverpassService for testability (matching
RoutingService pattern) and add close() for client lifecycle management.
14 tests covering query building, constraint detection, and error handling.
Fixes#108
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Doug Borg