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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
"""
Log formatters that output terse JSON.
"""
import json
import logging
_encoder = json.JSONEncoder(ensure_ascii=False, separators=(",", ":"))
# The properties of a standard LogRecord that should be ignored when generating
# JSON logs.
_IGNORED_LOG_RECORD_ATTRIBUTES = {
"args",
"asctime",
"created",
"exc_info",
# exc_text isn't a public attribute, but is used to cache the result of formatException.
"exc_text",
"filename",
"funcName",
"levelname",
"levelno",
"lineno",
"message",
"module",
"msecs",
"msg",
"name",
"pathname",
"process",
"processName",
"relativeCreated",
"stack_info",
"taskName",
"thread",
"threadName",
}
class JsonFormatter(logging.Formatter):
def format(self, record: logging.LogRecord) -> str:
event = {
"log": record.getMessage(),
"namespace": record.name,
"level": record.levelname,
}
return self._format(record, event)
def _format(self, record: logging.LogRecord, event: dict) -> str:
# Add attributes specified via the extra keyword to the logged event.
for key, value in record.__dict__.items():
if key not in _IGNORED_LOG_RECORD_ATTRIBUTES:
event[key] = value
if record.exc_info:
exc_type, exc_value, _ = record.exc_info
if exc_type:
event["exc_type"] = f"{exc_type.__name__}"
event["exc_value"] = f"{exc_value}"
return _encoder.encode(event)
class TerseJsonFormatter(JsonFormatter):
def format(self, record: logging.LogRecord) -> str:
event = {
"log": record.getMessage(),
"namespace": record.name,
"level": record.levelname,
"time": round(record.created, 2),
}
return self._format(record, event)
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