rethink-public/log_setup
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fix: JSON extra cannot clobber canonical time/level/module fields (v0.3.1)

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guard the extra-merge loop with the formatter's own output keys (time/level/module/
message). stdlib LogRecord rejects extra keys colliding with real attribute names, but
time/level are NOT LogRecord attrs, so a caller's extra={"time":...}/{"level":...}
previously overwrote the UTC timestamp / levelname — the two fields Loki/Grafana alert
on. now those keys are reserved and a colliding extra is dropped.

Signed-off-by: disqualifier <dev@disqualifier.me>
This commit is contained in:
disqualifier 2026-06-29 17:11:45 -04:00
parent 73007fe900
commit ff29e05322
4 changed files with 9 additions and 4 deletions
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2
README.md
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@ -13,7 +13,7 @@ and emit; their records flow into the handlers `log_setup` wired.
## Install
```
log_setup @ git+ssh://git@git.rethinkstudios.io/rethink-public/log_setup.git@v0.3.0
log_setup @ git+ssh://git@git.rethinkstudios.io/rethink-public/log_setup.git@v0.3.1
```
No dependencies — stdlib only.

2
pyproject.toml
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@ -4,7 +4,7 @@ build-backend = "hatchling.build"
[project]
name = "log_setup"
version = "0.3.0"
version = "0.3.1"
description = "stdlib app-entry-point logging setup: live run.log, rotation, gzip, retention, consistent format"
requires-python = ">=3.10"
dependencies = []

2
src/log_setup/__init__.py
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@ -19,4 +19,4 @@ from .setup import setup_logging
__all__ = ["setup_logging"]
__version__ = "0.3.0"
__version__ = "0.3.1"

7
src/log_setup/formats.py
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@ -15,6 +15,11 @@ DEFAULT_FORMAT = "%(asctime)s | %(name)s | %(levelname)s | %(message)s"
DEFAULT_DATEFMT = "%Y-%m-%d %H:%M:%S"
_RESERVED = frozenset(vars(logging.makeLogRecord({})).keys()) | {"message", "asctime"}
# this formatter's own canonical output keys — stdlib's LogRecord rejects `extra` keys
# colliding with real attribute names (e.g. `module`), but `time`/`level` are NOT
# LogRecord attrs, so a caller's extra={"time":...}/{"level":...} would otherwise
# overwrite the UTC timestamp / levelname. guard them explicitly
_OUTPUT_KEYS = frozenset({"time", "level", "module", "message"})
class JsonLinesFormatter(logging.Formatter):
@ -38,7 +43,7 @@ class JsonLinesFormatter(logging.Formatter):
"message": record.getMessage(),
}
for key, value in record.__dict__.items():
if key not in _RESERVED and not key.startswith("_"):
if key not in _RESERVED and key not in _OUTPUT_KEYS and not key.startswith("_"):
payload[key] = value
if record.exc_info:
payload["exc_info"] = self.formatException(record.exc_info)