50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
#!/usr/bin/env python3
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"""Rebuild data/misc/loglevel.tsv from RFC 5424's severity table.
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data-import/loglevel.py [--source URL_OR_FILE] [--cache DIR] [--out FILE]
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Table 2 is the whole set, read between the facility table's caption and its own. The
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RFC describes both tables for informational purposes, so a severity is what an
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originator writes rather than something a collector rejects.
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"""
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import argparse
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import re
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import sys
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from pathlib import Path
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import source
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import tsv
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SOURCE = "https://www.rfc-editor.org/rfc/rfc5424.txt"
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OUT = Path(__file__).resolve().parent.parent / "data" / "misc" / "loglevel.tsv"
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CACHE = Path(__file__).resolve().parent / "cache"
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COLUMNS = ["code", "severity"]
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TABLE = re.compile(r"Table 1\.\s+Syslog Message Facilities(.*?)Table 2\.\s+Syslog Message Severities", re.S)
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ROW = re.compile(r"^ +(\d) +([A-Z][a-z]+): ", re.M)
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EXPECTED = 8
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def rows(text):
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table = TABLE.search(text)
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if not table:
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sys.exit("the RFC holds no text between the facility and the severity caption; its tables have moved")
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for code, severity in ROW.findall(table.group(1)):
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yield {"code": code, "severity": severity}
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def main():
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p = argparse.ArgumentParser(description=__doc__.splitlines()[0])
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p.add_argument("--cache", default=str(CACHE))
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p.add_argument("--source", default=SOURCE)
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p.add_argument("--out", default=str(OUT))
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a = p.parse_args()
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table = sorted(rows(source.fetch(a.source, a.cache, "rfc5424.txt").decode("utf-8")), key=lambda r: r["code"])
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codes = [r["code"] for r in table]
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if codes != [str(i) for i in range(EXPECTED)]:
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sys.exit(f"the severity table numbers {codes}, not 0 through {EXPECTED - 1}")
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tsv.write(a.out, COLUMNS, table)
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if __name__ == "__main__":
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main()
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