Concurrent, rate-limited feed ingestion wired end to end: 'scrape' pulls
live security news into the SQLite store, idempotent across re-runs.
- internal/fetch: per-host token-bucket rate limiting, conditional GET
(ETag/Last-Modified with 304 handling), retry+backoff that honors
Retry-After and treats timeouts/cancellation as non-retryable, per-source
deadline, honest User-Agent, 16MB body cap. robots.txt is enforced only via
Client.Allowed() for the future HTML article-scrape path, not on subscribed
feed fetches (user-directed retrieval; several publishers blanket-disallow
generic bots yet serve a public feed).
- internal/parse: gofeed RSS/Atom to a normalized Item; RFC1123Z/RFC822Z/
RFC3339 time fallbacks (CISA emits RFC822Z, not RFC1123Z as first researched).
- internal/normalize: canonical URL (lowercase scheme+host, drop fragment,
strip utm_*/gclid/fbclid/ref/mc_cid/mc_eid, drop trailing slash), title
normalization, goquery HTML strip, sha256 content+title hashes.
- internal/ingest: errgroup fan-out over sources, fail-soft per source, fetch
-> parse -> normalize -> InsertArticle dedup via store.ErrDuplicate, plus
fetch_state upsert for conditional GET.
- store: migration 0002 adds articles.title_hash; GetFetchState/UpsertFetchState.
- Trimmed testdata/feeds fixtures (3 items each) back golden parse tests; full
suite is offline and passes under -race. Proven live: cold run 215 new across
7 sources, warm run 0 new (304s + dedup).
Ctrl-C aborts scrape cleanly via signal-aware context.
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