Ryan Malloy
e9aed6ce59
Third-pass optimization on parse_tuple_payload's hot loop. Previous phases removed redundant work; this one removes correct-but-wasteful work: the if/elif chain checked branches in implementation order, not frequency order. Fixed-width types (INT, FLOAT, DATE, BIGINT - the most common columns in real queries) sat at the bottom, paying ~7 frozenset misses per column. Changes (src/informix_db/_resultset.py): * Added _FIXED_WIDTH_TYPES = frozenset(FIXED_WIDTHS.keys()) at module load. * New fast-path branch at the TOP of parse_tuple_payload's loop body that handles every _FIXED_WIDTH_TYPES column inline: one frozenset check, one dict lookup, one decode, continue. Skips every other branch. * Cleaned up the bottom fall-through; it now genuinely only catches unknown types. Performance vs Phase 24 baseline: * parse_tuple_5cols_iso8859: 1659 ns -> 1400 ns (-16%) * parse_tuple_5cols_utf8: 1649 ns -> 1341 ns (-19%) Cumulative vs Phase 21 baseline (before any optimization): * parse_tuple_5cols: 2796 ns -> 1400 ns (-50%) - HALF the time * decode_int: 230 ns -> 139 ns (-40%) Margaret Hamilton review surfaced one HIGH finding addressed before tagging: * H: The fast-path optimization assumes every FIXED_WIDTHS key is decodable WITHOUT qualifier inspection (encoded_length etc.). True today, but a future contributor adding a fixed-width type that needs qualifier bits (like DATETIME does) would silently get wrong decode behavior - Lauren-Bug class failure. Fix: added INVARIANT comment to FIXED_WIDTHS in converters.py AND added tests/test_resultset_invariants.py with three CI tripwire tests: - _FIXED_WIDTH_TYPES is disjoint from every other dispatch branch - Every FIXED_WIDTHS key has a DECODERS entry - DECODERS keys stay < 0x100 (Phase 24 collision-free guarantee) The tests carry instructions: if one fires, don't update the test to match - either restore the property or refactor the optimization. Comments rot when nobody reads them; tests fail loudly. baseline.json refreshed; 72 unit + 224 integration + 28 bench = 324 tests; ruff clean.
108 lines
3.4 KiB
TOML
108 lines
3.4 KiB
TOML
[project]
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name = "informix-db"
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version = "2026.05.04.10"
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description = "Pure-Python driver for IBM Informix IDS — speaks the SQLI wire protocol over raw sockets. No CSDK, no JVM, no native libraries."
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readme = "README.md"
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license = { text = "MIT" }
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authors = [{ name = "Ryan Malloy", email = "ryan@supported.systems" }]
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requires-python = ">=3.10"
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keywords = ["informix", "database", "sqli", "db-api", "pep-249", "asyncio", "async"]
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classifiers = [
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"Development Status :: 4 - Beta",
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"Framework :: AsyncIO",
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"Intended Audience :: Developers",
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"License :: OSI Approved :: MIT License",
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"Operating System :: OS Independent",
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"Programming Language :: Python :: 3",
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"Programming Language :: Python :: 3 :: Only",
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"Programming Language :: Python :: 3.10",
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"Programming Language :: Python :: 3.11",
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"Programming Language :: Python :: 3.12",
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"Programming Language :: Python :: 3.13",
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"Programming Language :: Python :: 3.14",
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"Topic :: Database",
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"Topic :: Database :: Front-Ends",
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"Typing :: Typed",
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]
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dependencies = []
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[project.urls]
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Homepage = "https://github.com/rsp2k/informix-db"
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Documentation = "https://github.com/rsp2k/informix-db/tree/main/docs"
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Issues = "https://github.com/rsp2k/informix-db/issues"
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[project.optional-dependencies]
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dev = [
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"pytest>=8.0",
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"ruff>=0.6",
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]
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[build-system]
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requires = ["hatchling"]
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build-backend = "hatchling.build"
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[tool.hatch.build.targets.wheel]
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packages = ["src/informix_db"]
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[tool.hatch.build.targets.sdist]
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# Defense in depth: exclude operator-private and dev-only artifacts from the sdist
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# (the wheel doesn't ship these by default, but the sdist would).
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# See ~/.claude/rules/python.md for the full pre-publish PII audit playbook.
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exclude = [
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"CLAUDE.md", # operator-private context
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".env", ".env.local", ".env.*",
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".mcp.json", # may contain local filesystem paths
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"build/", # decompiled JDBC, downloaded JARs
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"audits/",
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"docs/CAPTURES/", # spike artifacts; tests can re-capture against the dev container
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"tests/reference/", # Java reference client — spike infra
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".pytest_cache/", ".ruff_cache/", ".mypy_cache/",
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"dist/", "*.egg-info/",
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]
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[tool.ruff]
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line-length = 100
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target-version = "py310"
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src = ["src", "tests"]
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[tool.ruff.lint]
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select = [
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"E", # pycodestyle errors
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"W", # pycodestyle warnings
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"F", # pyflakes
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"I", # isort (import sorting)
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"B", # flake8-bugbear
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"C4", # flake8-comprehensions
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"UP", # pyupgrade
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"SIM", # flake8-simplify
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"PTH", # flake8-use-pathlib
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"RUF", # ruff-specific
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]
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ignore = [
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"E501", # line too long — handled by formatter
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]
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[tool.ruff.lint.per-file-ignores]
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"tests/**" = ["B011"] # allow assert False in tests
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[tool.pytest.ini_options]
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minversion = "8.0"
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testpaths = ["tests"]
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asyncio_mode = "auto" # pytest-asyncio: auto-detect ``async def`` tests
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addopts = [
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"-ra", # short summary for non-passing
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"--strict-markers",
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"--strict-config",
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"-m", "not integration and not benchmark", # default: unit-only. Override with: pytest -m integration / -m benchmark
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]
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markers = [
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"integration: requires a running Informix container (docker compose up); skipped by default",
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"benchmark: pytest-benchmark performance test; skipped by default. Run with `make bench`.",
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]
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[dependency-groups]
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dev = [
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"pytest-asyncio>=1.3.0",
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"pytest-benchmark>=5.2.3",
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]
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