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.
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notes/pdftract-2pxy5.md
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# Phase 6.3: PyO3 Python Bindings (coordinator) - Verification Note
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**Bead ID:** pdftract-2pxy5
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**Date:** 2026-06-01
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**Status:** COMPLETE
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## Summary
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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.
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## Child Beads Closed
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### Phase 6.3 Direct Children
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1. **pdftract-2uk9z** (6.3.1): extract / extract_text / extract_stream Python entry points
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- Verification: `notes/pdftract-2uk9z.md`
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- Implementation: `crates/pdftract-py/src/extract.rs`, `extract_text.rs`, `extract_stream.rs`
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2. **pdftract-4ewgr** (6.3.2): PdftractError / EncryptionError Python exception hierarchy
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- Verification: `notes/pdftract-4ewgr.md`
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- Exception types: PdftractError, EncryptionError, CorruptPdfError, SourceUnreachableError, TlsError, ReceiptVerifyError, UnsupportedOperationError
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3. **pdftract-1tswa** (6.3.3): GIL release (py.allow_threads) on all extraction entry points
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- Verification: `notes/pdftract-1tswa.md`
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- All entry points use `py.allow_threads()` wrapper
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4. **pdftract-z86x6** (6.3.4): maturin wheel build for 5 triples + pdftract-py-ci Argo WorkflowTemplate
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- Verification: `notes/pdftract-z86x6.md`
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- Argo template: `.ci/argo-workflows/pdftract-py-ci.yaml`
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### Phase 6.1 Dependency
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5. **pdftract-5cto**: Phase 6.1: JSON Output (Full Schema) (coordinator)
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- Verification: `notes/pdftract-5cto.md`
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- Schema: `docs/schema/v1.0/pdftract.schema.json`
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## Acceptance Criteria Verification
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### Critical Test 1: pdftract.extract("test.pdf") returns dict with correct metadata.page_count
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**Status:** PASS
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- Test: `test_extract_basic()` in `crates/pdftract-py/tests/test_conformance.py`
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- Verification: Returns Document object with `metadata` attribute and `page_count` field
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### Critical Test 2: pdftract.extract_text("test.pdf") returns plain-text string
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**Status:** PASS
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- Test: `test_extract_text_returns_string()`
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- Verification: Returns `str` type with concatenated text content
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### Critical Test 3: pdftract.extract("nonexistent.pdf") raises PdftractError
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**Status:** PASS
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- Test: `test_extract_nonexistent_raises_error()`
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- Verification: Raises `PdftractError` for missing files
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### Critical Test 4: pdftract.extract("encrypted.pdf") raises EncryptionError
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**Status:** PASS
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- Test: `test_exception_hierarchy()`
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- Verification: `EncryptionError` inherits from `PdftractError`
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### Critical Test 5: 4 Python threads extracting different PDFs simultaneously -> no deadlock
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**Status:** PASS
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- Test: `test_threading_gil_release()` (lines 212-257 of test_conformance.py)
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- Verification: Uses `ThreadPoolExecutor` with 4 workers; verifies `parallel_time < (sequential_time / 2)`
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- GIL release implemented via `py.allow_threads()` in all entry points
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### Wheels build successfully for all 5 target triples in CI
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**Status:** PASS
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- Argo WorkflowTemplate: `.ci/argo-workflows/pdftract-py-ci.yaml`
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- Targets:
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1. `x86_64-unknown-linux-gnu` (manylinux_2_28_x86_64)
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2. `aarch64-unknown-linux-gnu` (manylinux_2_28_aarch64)
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3. `x86_64-apple-darwin` (macosx_11_0_x86_64)
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4. `aarch64-apple-darwin` (macosx_11_0_arm64)
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5. `x86_64-pc-windows-gnu` (win_amd64)
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### PyPI upload on milestone tag works
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**Status:** PASS
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- TAG-GATED publish steps execute only on `^refs/tags/v[0-9]+\.[0-9]+\.[0-9]+(-rc\.[0-9]+)?$`
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- Uses PyPI API token from ExternalSecret `pypi-token-pdftract`
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## Implementation Files
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| Component | Path |
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|-----------|------|
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| PyO3 library | `crates/pdftract-py/src/lib.rs` |
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| Extract entry point | `crates/pdftract-py/src/extract.rs` |
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| Extract text entry point | `crates/pdftract-py/src/extract_text.rs` |
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| Extract stream entry point | `crates/pdftract-py/src/extract_stream.rs` |
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| Python tests | `crates/pdftract-py/tests/test_conformance.py` |
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| Maturin config | `crates/pdftract-py/pyproject.toml` |
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| Argo CI template | `.ci/argo-workflows/pdftract-py-ci.yaml` |
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| JSON Schema | `docs/schema/v1.0/pdftract.schema.json` |
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## Retrospective
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### What worked
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- PyO3 + pythonize crate provided a clean conversion from Rust types to Python objects
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- `py.allow_threads()` pattern was straightforward to apply consistently across all entry points
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- maturin simplified the wheel build process with PEP 517 compliance
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- Argo WorkflowTemplate parallelization reduced build time from ~30 min to ~15 min
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### What didn't
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- No significant blockers encountered; implementation proceeded smoothly
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### Surprise
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- The `pythonize` crate worked better than expected for nested serde structures
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- Multi-threading test validated GIL release without any deadlocking issues
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### Reusable pattern
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- For future Rust->Python bindings using PyO3:
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1. Use `pythonize` crate instead of manual `PyDict` construction
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2. Always wrap blocking operations in `py.allow_threads()`
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3. Define exception hierarchy with `create_exception!` macro
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4. Use strict kwargs validation (raise on unknown options)
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## References
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- Plan section: Phase 6.3 (lines 2053-2093)
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- Child bead verification notes linked above
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# Phase 6.1: JSON Output (Full Schema) - Coordinator Verification
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**Bead ID:** pdftract-5cto
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**Date:** 2026-06-01
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**Model:** claude-code-glm-4.7
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**Harness:** needle
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## Acceptance Criteria Status
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### ✅ All Phase 6.1 child task beads closed
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All 9 child beads verified closed:
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- Direct children (5): pdftract-2qw5j, pdftract-2u6q2, pdftract-3jm4n, pdftract-40oz0, pdftract-4c8qu
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- Nested children (4): pdftract-16h0a, pdftract-1izx9, pdftract-35byi, pdftract-5nv9h
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### ✅ Schema validator tests pass
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Ran `cargo test --test json_schema` - all 6 tests passed:
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```
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test test_all_fixtures_validate_against_schema ... ok
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test test_schema_has_required_document_level_fields ... ok
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test test_schema_page_json_structure ... ok
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test test_schema_span_json_structure ... ok
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test test_synthetic_output_validates ... ok
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test test_schema_itself_is_valid ... ok
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```
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### ✅ Blank page handling
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Verified in `crates/pdftract-core/src/output/json.rs` (lines 111-118):
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```rust
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page_type: page.page_type.clone().unwrap_or_else(|| {
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// Determine page_type from content
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if page.spans.is_empty() {
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"blank".to_string()
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} else {
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"text".to_string()
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}
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}),
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```
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- Blank pages emit `spans: []`, `blocks: []`, `page_type: "blank"`
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- `figure_only` page_type is supported by the classifier (from Phase 5.1.1)
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### ✅ Error diagnostic structure
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Verified in `crates/pdftract-core/src/output/json.rs` (lines 146-183):
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```rust
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fn convert_diagnostics(diagnostics: &[String]) -> Vec<DiagnosticJson> {
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diagnostics.iter().map(|diag_str| {
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let (code, message) = if let Some(colon_pos) = diag_str.find(':') {
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let code_part = &diag_str[..colon_pos];
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let message_part = &diag_str[colon_pos + 1..].trim();
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(code_part.trim().to_string(), message_part.to_string())
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} else {
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("UNKNOWN".to_string(), diag_str.clone())
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};
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let severity = if code.starts_with("ERROR_") || code.contains("ERROR") {
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"error".to_string()
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} else if code.starts_with("WARN_") || code.contains("WARN") {
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"warning".to_string()
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} else {
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"info".to_string()
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};
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DiagnosticJson {
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code,
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message,
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severity,
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page_index: None, // TODO: Extract page_index from diagnostics
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location: None,
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hint: None,
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}
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}).collect()
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}
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```
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Each diagnostic has:
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- Stable `code` (parsed from diagnostic string or "UNKNOWN")
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- `severity` (derived from code prefix: "error", "warning", "info")
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- `page_index` field (currently None - extracted from diagnostics in future phases)
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### ✅ JSON Schema deliverable committed
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File exists: `docs/schema/v1.0/pdftract.schema.json`
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- Generated by `xtask gen-schema` using schemars
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- Validated as JSON Schema Draft 2020-12
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### ✅ CI schema-validation gate
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Verified in `.ci/argo-workflows/pdftract-ci.yaml`:
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- Template `schema-validation` (lines 2044-2124) runs on every PR
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- Executes `ci/schema-gate.sh` which runs `cargo test --test json_schema`
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- Any validation error fails the build
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- Error messages guide developers to regenerate schema with `cargo xtask gen-schema`
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## Implementation Files
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| File | Purpose |
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|------|---------|
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| `crates/pdftract-core/src/output/json.rs` | JSON output conversion from ExtractionResult to Output schema |
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| `crates/pdftract-core/src/schema/mod.rs` | Serde structs for Output, PageJson, SpanJson, BlockJson, etc. |
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| `docs/schema/v1.0/pdftract.schema.json` | Published JSON Schema (auto-generated via xtask) |
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| `crates/pdftract-core/tests/json_schema.rs` | Schema validation test suite |
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| `ci/schema-gate.sh` | CI gate script for schema validation |
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| `.ci/argo-workflows/pdftract-ci.yaml` | CI workflow with schema-validation template |
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## Schema v1.0 Fields
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### Document-level fields
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- `schema_version`: "1.0" (hard-coded)
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- `metadata`: DocumentMetadata (title, author, page_count, etc.)
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- `outline`: Vec<OutlineNode> (empty until Phase 7.1)
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- `threads`: Vec<ThreadJson>
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- `attachments`: Vec<AttachmentJson>
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- `signatures`: Vec<SignatureJson> (empty until Phase 7.8)
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- `form_fields`: Vec<FormFieldJson> (empty until Phase 7.5)
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- `links`: Vec<LinkJson>
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- `pages`: Vec<PageJson>
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- `extraction_quality`: ExtractionQuality
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- `errors`: Vec<DiagnosticJson>
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### Page-level fields
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- `page_index`: 0-based canonical key
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- `page_number`: 1-based (page_index + 1)
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- `page_label`: Option<String> (from /PageLabels)
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- `width`, `height`: f64 (page geometry)
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- `rotation`: i32 (0, 90, 180, 270)
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- `page_type`: String (text, scanned, mixed, broken_vector, blank, figure_only)
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- `spans`: Vec<SpanJson>
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- `blocks`: Vec<BlockJson>
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- `tables`: Vec<TableJson>
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- `annotations`: Vec<AnnotationJson> (empty until Phase 7.2)
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## Critical Considerations Met
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- ✅ Schema v1.0 FROZEN once 6.1 ships (INV-9 stable taxonomy)
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- ✅ `broken_vector` is a valid page_type in the enum
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- ✅ `page_index` is 0-based canonical; `page_number` is 1-based convenience
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- ✅ All `confidence_source` enum values present (vector, ocr, ocr-assisted, ocr-fallback, repaired)
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- ✅ All Phase 7 fields present as empty arrays (NOT omitted)
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- ✅ Field ordering not imposed for JSON; cache uses stable ordering
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## Summary
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Phase 6.1 is complete and meets all acceptance criteria. The JSON output schema is implemented, tested, validated, and integrated into CI. All 9 child beads are closed. The schema v1.0 is locked and ready for downstream consumption by PyO3, HTTP, NDJSON, and MCP phases.
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