Ryan Malloy
87b5b7c354
Data corruption affecting every Informix version including 15. Two of the
three silently corrupt columns AFTER the offending one, so the damage
shows up far from its cause.
BOOLEAN: described as UDTFIXED(41) with encoded_length=1, but carries the
full UDT envelope on the wire — [1-byte indicator][4-byte length][data],
six bytes for a one-byte value. We read one byte and left five behind.
Captured payload for (INT, BOOLEAN 't', INT, VARCHAR 'tail'):
00 01 b2 07 | 00 00 00 00 01 74 | 00 03 64 0e | 04 74 61 69 6c
Before: (111111, b'\x00', 1, '\x00\x03d\x0e\x04tail')
After: (111111, True, 222222, 'tail')
NCHAR: fixed-width and space-padded like CHAR, but we had it grouped with
the byte-length-prefixed types. NCHAR(10) holding 'nch' read 0x6E ('n') as
a 110-byte length. Silent truncation alone, struct.error with any column
following. NVARCHAR really is length-prefixed and is unchanged; there's a
test guarding both sides now.
INT8/SERIAL8: absent from FIXED_WIDTHS, fell through to the unknown-type
path and surfaced as raw bytes. INT8 is not BIGINT — 10 bytes,
sign-magnitude, halves stored high-last:
bytes 0-1 sign word (0=NULL, 1=pos, 0xFFFF=neg)
bytes 2-5 LOW 32 bits, bytes 6-9 HIGH 32 bits
+n and -n share magnitude bytes, so a two's-complement read is wrong for
every negative while looking correct for every positive.
Not a version bug. Reported against Informix 12, but the same 28-type
round-trip against 12.10.FC12W1DE and 15.0.1.0.3DE produced byte-identical
wire output. It read as version-specific only because INT8/SERIAL8 dominate
12-era schemas while our fixtures use BIGINT.
251 tests missed all three because no fixture used these types. Added
tests/test_type_framing.py (20 integration) and tests/test_int8_unit.py
(14 unit, wire vectors from both servers). Each type is tested twice —
alone, and with trailing columns, since only the latter catches desync.
Verified: 271/271 integration on 15; 241/241 non-smart-LOB on 12.10 (the
LOB tests need an sbspace that image lacks); 20/20 framing tests on both.
Also corrected README and _fastpath docstring, which asserted 12.10
compatibility that had never been tested. The claims held up, but they
were guesses when written and cost a user debugging time.
112 lines
3.8 KiB
TOML
112 lines
3.8 KiB
TOML
[project]
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name = "informix-driver"
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version = "2026.05.08.2"
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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://informix-driver.warehack.ing"
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Documentation = "https://informix-driver.warehack.ing"
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Source = "https://git.supported.systems/warehack.ing/informix-db"
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Issues = "https://git.supported.systems/warehack.ing/informix-db/issues"
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Changelog = "https://git.supported.systems/warehack.ing/informix-db/src/branch/main/CHANGELOG.md"
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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/**", # protocol notes / decision log / captures — go to GitHub for the depth
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"docs-site/**", # Astro/Starlight site sources — published at informix-driver.warehack.ing
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"tests/reference/**", # Java reference client — spike infra
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"tests/benchmarks/.results/**", # pytest-benchmark cache (gitignored, but still ships unless excluded)
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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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