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trezor-firmware/python/trezorlib/log.py
2019-05-29 18:48:15 +02:00

52 lines
1.8 KiB
Python

# This file is part of the Trezor project.
#
# Copyright (C) 2012-2019 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
import logging
from typing import Optional, Set, Type
from . import protobuf
OMITTED_MESSAGES = set() # type: Set[Type[protobuf.MessageType]]
class PrettyProtobufFormatter(logging.Formatter):
def format(self, record: logging.LogRecord) -> str:
time = self.formatTime(record)
message = "[{time}] {source} {level}: {msg}".format(
time=time,
level=record.levelname.upper(),
source=record.name,
msg=super().format(record),
)
if hasattr(record, "protobuf"):
if type(record.protobuf) in OMITTED_MESSAGES:
message += " ({} bytes)".format(record.protobuf.ByteSize())
else:
message += "\n" + protobuf.format_message(record.protobuf)
return message
def enable_debug_output(handler: Optional[logging.Handler] = None):
if handler is None:
handler = logging.StreamHandler()
formatter = PrettyProtobufFormatter()
handler.setFormatter(formatter)
logger = logging.getLogger("trezorlib")
logger.setLevel(logging.DEBUG)
logger.addHandler(handler)