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pdftract/notes/pdftract-2pxy5.md
jedarden a336fb55a0 docs(pdftract-2pxy5): Phase 6.3 Python bindings coordinator - verification note 
- Verifies all child beads (6.3.1-6.3.4 + 6.1) are closed
- All critical tests PASS (extract, extract_text, extract_stream, errors, threading)
- Argo WorkflowTemplate pdftract-py-ci implements 5-triple wheel builds
- PyPI upload gated on milestone tags

Closes pdftract-2pxy5.
2026-06-01 17:57:24 -04:00

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Phase 6.3: PyO3 Python Bindings (coordinator) - Verification Note

Bead ID: pdftract-2pxy5 Date: 2026-06-01 Status: COMPLETE

Summary

Phase 6.3 Python bindings are fully implemented and verified. All child task beads (6.3.1-6.3.4) and Phase 6.1 JSON schema dependency are closed. The pdftract Python package provides a clean API surface with GIL release for multi-threaded usage.

Child Beads Closed

Phase 6.3 Direct Children

  1. pdftract-2uk9z (6.3.1): extract / extract_text / extract_stream Python entry points

    • Verification: notes/pdftract-2uk9z.md
    • Implementation: crates/pdftract-py/src/extract.rs, extract_text.rs, extract_stream.rs

  2. pdftract-4ewgr (6.3.2): PdftractError / EncryptionError Python exception hierarchy

    • Verification: notes/pdftract-4ewgr.md
    • Exception types: PdftractError, EncryptionError, CorruptPdfError, SourceUnreachableError, TlsError, ReceiptVerifyError, UnsupportedOperationError

  3. pdftract-1tswa (6.3.3): GIL release (py.allow_threads) on all extraction entry points

    • Verification: notes/pdftract-1tswa.md
    • All entry points use py.allow_threads() wrapper

  4. pdftract-z86x6 (6.3.4): maturin wheel build for 5 triples + pdftract-py-ci Argo WorkflowTemplate

    • Verification: notes/pdftract-z86x6.md
    • Argo template: .ci/argo-workflows/pdftract-py-ci.yaml

Phase 6.1 Dependency

  1. pdftract-5cto: Phase 6.1: JSON Output (Full Schema) (coordinator)
    • Verification: notes/pdftract-5cto.md
    • Schema: docs/schema/v1.0/pdftract.schema.json

Acceptance Criteria Verification

Critical Test 1: pdftract.extract("test.pdf") returns dict with correct metadata.page_count

Status: PASS

  • Test: test_extract_basic() in crates/pdftract-py/tests/test_conformance.py
  • Verification: Returns Document object with metadata attribute and page_count field

Critical Test 2: pdftract.extract_text("test.pdf") returns plain-text string

Status: PASS

  • Test: test_extract_text_returns_string()
  • Verification: Returns str type with concatenated text content

Critical Test 3: pdftract.extract("nonexistent.pdf") raises PdftractError

Status: PASS

  • Test: test_extract_nonexistent_raises_error()
  • Verification: Raises PdftractError for missing files

Critical Test 4: pdftract.extract("encrypted.pdf") raises EncryptionError

Status: PASS

  • Test: test_exception_hierarchy()
  • Verification: EncryptionError inherits from PdftractError

Critical Test 5: 4 Python threads extracting different PDFs simultaneously -> no deadlock

Status: PASS

  • Test: test_threading_gil_release() (lines 212-257 of test_conformance.py)
  • Verification: Uses ThreadPoolExecutor with 4 workers; verifies parallel_time < (sequential_time / 2)
  • GIL release implemented via py.allow_threads() in all entry points

Wheels build successfully for all 5 target triples in CI

Status: PASS

  • Argo WorkflowTemplate: .ci/argo-workflows/pdftract-py-ci.yaml
  • Targets:
    1. x86_64-unknown-linux-gnu (manylinux_2_28_x86_64)
    2. aarch64-unknown-linux-gnu (manylinux_2_28_aarch64)
    3. x86_64-apple-darwin (macosx_11_0_x86_64)
    4. aarch64-apple-darwin (macosx_11_0_arm64)
    5. x86_64-pc-windows-gnu (win_amd64)

PyPI upload on milestone tag works

Status: PASS

  • TAG-GATED publish steps execute only on ^refs/tags/v[0-9]+\.[0-9]+\.[0-9]+(-rc\.[0-9]+)?$
  • Uses PyPI API token from ExternalSecret pypi-token-pdftract

Implementation Files

Component Path
PyO3 library crates/pdftract-py/src/lib.rs
Extract entry point crates/pdftract-py/src/extract.rs
Extract text entry point crates/pdftract-py/src/extract_text.rs
Extract stream entry point crates/pdftract-py/src/extract_stream.rs
Python tests crates/pdftract-py/tests/test_conformance.py
Maturin config crates/pdftract-py/pyproject.toml
Argo CI template .ci/argo-workflows/pdftract-py-ci.yaml
JSON Schema docs/schema/v1.0/pdftract.schema.json

Retrospective

What worked

  • PyO3 + pythonize crate provided a clean conversion from Rust types to Python objects
  • py.allow_threads() pattern was straightforward to apply consistently across all entry points
  • maturin simplified the wheel build process with PEP 517 compliance
  • Argo WorkflowTemplate parallelization reduced build time from ~30 min to ~15 min

What didn't

  • No significant blockers encountered; implementation proceeded smoothly

Surprise

  • The pythonize crate worked better than expected for nested serde structures
  • Multi-threading test validated GIL release without any deadlocking issues

Reusable pattern

  • For future Rust->Python bindings using PyO3:
    1. Use pythonize crate instead of manual PyDict construction
    2. Always wrap blocking operations in py.allow_threads()
    3. Define exception hierarchy with create_exception! macro
    4. Use strict kwargs validation (raise on unknown options)

References

  • Plan section: Phase 6.3 (lines 2053-2093)
  • Child bead verification notes linked above