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Original file line number | Diff line number | Diff line change |
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import itertools | ||
import logging | ||
import re | ||
from datetime import datetime | ||
from pathlib import Path | ||
from typing import Iterator | ||
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from dissect.target.helpers.fsutil import open_decompress | ||
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log = logging.getLogger(__name__) | ||
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RE_TS = re.compile(r"^[A-Za-z]{3}\s*\d{1,2}\s\d{1,2}:\d{2}:\d{2}") | ||
RE_TS_ISO = re.compile(r"^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{6}\+\d{2}:\d{2}") | ||
RE_LINE = re.compile( | ||
r""" | ||
\d{2}:\d{2}\s # First match on the similar ending of the different timestamps | ||
(?:\S+)\s # The hostname, but do not capture it | ||
(?P<service>\S+?)(\[(?P<pid>\d+)\])?: # The service / daemon with optionally the PID between brackets | ||
\s*(?P<message>.+?)\s*$ # The log message stripped from spaces left and right | ||
""", | ||
re.VERBOSE, | ||
) | ||
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def iso_readlines(file: Path) -> Iterator[tuple[datetime, str]]: | ||
"""Iterator reading the provided log file in ISO format. Mimics ``year_rollover_helper`` behaviour.""" | ||
with open_decompress(file, "rt") as fh: | ||
for line in fh: | ||
if not (match := RE_TS_ISO.match(line)): | ||
log.warning("No timestamp found in one of the lines in %s!", file) | ||
log.debug("Skipping line: %s", line) | ||
continue | ||
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try: | ||
ts = datetime.strptime(match[0], "%Y-%m-%dT%H:%M:%S.%f%z") | ||
except ValueError as e: | ||
log.warning("Unable to parse ISO timestamp in line: %s", line) | ||
log.debug("", exc_info=e) | ||
continue | ||
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yield ts, line | ||
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def is_iso_fmt(file: Path) -> bool: | ||
"""Determine if the provided log file uses ISO 8601 timestamp format logging or not.""" | ||
return any(itertools.islice(iso_readlines(file), 0, 2)) |
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