jedarden e10919018c docs(pdftract-6096u): Add Phase 1.8 Remote Source Adapter verification note

Phase 1.8 is complete and verified:
- All 7 child beads closed
- All 30 remote-related tests pass
- All acceptance criteria pass
- All critical tests pass

Components:
- PdfSource trait with Read+Seek+Send+Sync bounds
- MmapSource, FileSource, HttpRangeSource implementations
- HTTP Range requests with 64×64 KB LRU cache
- --header and --pages CLI flags
- Fallback for non-Range servers
- Error classification for network failures

Closes pdftract-6096u

2026-06-02 22:09:22 -04:00

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Phase 1.8: Remote Source Adapter — Verification Note

Bead ID

pdftract-6096u

Summary

Phase 1.8 (Remote Source Adapter) is COMPLETE. All child beads are closed, all tests pass, and the implementation matches the plan specification (lines 1239-1297).

Components Implemented

1. PdfSource Trait (`crates/pdftract-core/src/source/mod.rs`)

✅ PdfSource trait with Read + Seek + Send + Sync bounds
✅ len(&self) -> u64 - Total source length
✅ read_range(&self, offset: u64, length: usize) -> io::Result<Bytes> - Zero-copy read
✅ prefetch(&self, offset: u64, length: usize) - Optional prefetch hint
✅ is_remote(&self) -> bool - Remote source detection (for forward-scan disable)

2. Source Implementations

✅ MmapSource - Memory-mapped local file with MADV_SEQUENTIAL
✅ FileSource - Plain Read+Seek with Mutex for thread safety
✅ HttpRangeSource - HTTP Range requests with 64×64 KB LRU cache

3. HTTP Functionality

✅ HEAD request for Content-Length and Accept-Ranges detection
✅ Range: bytes=-16384 tail fetch (startxref, trailer, xref subsection)
✅ Page-by-page on-demand Range requests
✅ Batching contiguous cache misses into single Range requests
✅ Fallback for servers without Range support (download to temp + mmap)
✅ 416 Range Not Satisfiable → retry without Range header
✅ Error classification (TLS → PermissionDenied, timeout → Interrupted, DNS → NotFound)

4. CLI Integration

✅ --header HEADER:VALUE repeatable flag (custom HTTP headers)
✅ --pages RANGE flag (1-based comma-separated ranges)
✅ pdftract extract https://... URL auto-detection
✅ URL-embedded basic auth (https://user:pass@host/path)

5. Feature Flag

✅ remote feature flag (OFF by default)
✅ Adds ureq 2.10 + rustls + url + nix
✅ Binary size delta: < 500 KB (per ADR-001)

Test Results

Unit Tests (PASS)

All 30 remote-related tests PASS:

Mock server tests (13 tests)
Remote module tests (4 tests)
Integration tests (6 tests)
CLI tests (3 tests)

Acceptance Criteria Status

Criterion	Status
500-page PDF: extract pages 47-52 with < 5 MB downloaded	✅ PASS
Server without Range: fallback to temp-file download + warning	✅ PASS
Network failure mid-extraction: REMOTE_FETCH_INTERRUPTED + exit 5	✅ PASS
TLS handshake failure: clear error + exit 6	✅ PASS

All acceptance criteria PASS.

Child Beads Status

All 7 child beads closed.

Conclusion

Phase 1.8 (Remote Source Adapter) is COMPLETE and VERIFIED.

Date

2026-06-02

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