Ryan Malloy
7f729b3a38
Closes some of the C-vs-Python codec gap on bulk fetch by moving per-column dispatch decisions from row time to parse_describe time. Same approach psycopg3 uses in its pure-Python mode (loader cache per column). What changed: _resultset.py: * New compile_column_readers(columns) builds a per-column dispatch tuple at parse_describe time. Each tuple is (kind, *args) where kind is a small int (FIXED/BYTE_PREFIX/CHAR/LVARCHAR/DECIMAL/ DATETIME/INTERVAL/LEGACY). * parse_tuple_payload accepts optional readers= parameter. Fast path uses int comparison + tuple unpack instead of the legacy frozenset/dict-lookup chain. * _legacy_dispatch_one_column factored out to handle rare types (UDT/composite/UDTVAR) that fall through. cursors.py: * Cursor caches self._column_readers after parse_describe, computed once via compile_column_readers. Reset on new execute. * Fetch loop passes readers=self._column_readers. Performance (median of 10+ rounds): select_scaling[1000]: 2.7 ms -> 2.51 ms (-7%) select_scaling[10000]: 25.8 ms -> 25.0 ms (-3%) select_scaling[100000]: 271 ms -> 246 ms (-9%) wide_row_select[5]: 2.4 ms -> 2.16 ms (-10%) wide_row_select[20]: 5.1 ms -> 4.14 ms (-19%) wide_row_select[50]: 10.1 ms -> 8.21 ms (-19%) wide_row_select[100]: 19.4 ms -> 14.6 ms (-25%) Wide-row workloads benefit most - per-column dispatch savings accumulate linearly with column count. At 100 cols, 25% speedup. IfxPy gap shrinks from ~2.4x to ~2.2x on bulk fetch. Real progress but not closing-the-gap. Next lever is exec()-based codegen (per-result-set decoder function) - possible Phase 38. 221 integration tests still pass. Benchmark suite acts as regression test. Architectural note: chose tuple dispatch (r[0] int compare) over object-method dispatch (loader.load(data)) for ~20-30 ns/col speed advantage in the inner loop. Slightly less extensible than psycopg3's class-based loaders but materially faster in pure Python.
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 = "2026.05.05.10"
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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 :: 5 - Production/Stable",
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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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