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#!/usr/bin/env python3
"""
Minecraft log filter for Umbrella (vanilla, Paper, Spigot, Fabric, etc.)
Strips low-value noise:
- keepAlive packet spam (Paper/Spigot debug logs)
- Internal class/library log lines
- Advancement grant/revoke noise
- Saving chunks / autosave lines
- UUID cache loading lines
Strips the "[HH:MM:SS] [Thread/LEVEL]: " prefix from standard Minecraft
log format, since the daemon already timestamps output.
Install: /usr/lib/umbrella/filters/minecraft.py
Unit YAML: log_filter: /usr/lib/umbrella/filters/minecraft.py
"""
import sys
import re
# Standard Minecraft log prefix: [HH:MM:SS] [Server thread/INFO]:
PREFIX = re.compile(r'^\[\d{2}:\d{2}:\d{2}\] \[[^\]]+\]: ')
SKIP = re.compile(
r'keepAlive' # packet keepAlive debug
r'|Saving chunks for level' # periodic autosave
r'|Saving and pausing game'
r'|com\.mojang\.' # internal Mojang class logs
r'|RCON Client /' # RCON connection noise
r'|RCON Listener'
r'|Preparing spawn area'
r'|Loading libraries'
r'|Loaded \d+ recipes'
r'|Loaded \d+ advancements'
r'|\[uuid-cache\]'
r'|^\s*$'
)
for line in sys.stdin:
if SKIP.search(line):
continue
line = PREFIX.sub('', line)
sys.stdout.write(line)
sys.stdout.flush()
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