Three call sites in webclaw-fetch used .expect("semaphore closed") on
`Semaphore::acquire()`. Under normal operation they never fire, but
under a shutdown race or adversarial runtime state the spawned task
would panic and be silently dropped from the batch / crawl run — the
caller would see fewer results than URLs with no indication why.
Rewritten to match on the acquire result:
- client::fetch_batch and client::fetch_and_extract_batch_with_options
now emit BatchResult/BatchExtractResult carrying
FetchError::Build("semaphore closed before acquire").
- crawler's inner loop emits a failed PageResult with the same error
string instead of panicking.
Behaviorally a no-op for the happy path. Fixes the silent-dropped-task
class of bug noted in the 2026-04-16 audit.
Version: 0.3.14 -> 0.3.15
CHANGELOG updated.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Crawls are same-origin by default. Enable allow_subdomains to follow
sibling/child subdomains (blog.example.com from example.com), or
allow_external_links for full cross-origin crawling.
Root domain extraction uses a heuristic that handles two-part TLDs
(co.uk, com.au). Includes 5 unit tests for root_domain().
Bump to 0.3.12.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Crawl:
- Real-time progress on stderr as pages complete
- --crawl-state saves progress on Ctrl+C, resumes from saved state
- Visited set + remaining frontier persisted for accurate resume
MCP server:
- Reads WEBCLAW_PROXY and WEBCLAW_PROXY_FILE env vars
- Falls back to proxies.txt in CWD (existing behavior)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
