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# Copyright (c) 2017–2018 crocoite contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
Simple logger inspired by structlog.
It is usually used like this: Classes are passed a logger instance. They bind
context to their name, so identifying the source of messages is easier. Every
log message carries a unique id (uuid) for automated identification as well as
a short human-readable message (msg) and arbitrary payload.
"""
import sys, json
from datetime import datetime
from functools import partial
from enum import IntEnum
from pytz import utc
class Level(IntEnum):
DEBUG = 0
INFO = 1
WARNING = 2
ERROR = 3
class Logger:
def __init__ (self, consumer=[], bindings={}):
self.bindings = bindings
self.consumer = consumer
def __call__ (self, level, *args, **kwargs):
if not isinstance (level, Level):
level = Level[level.upper ()]
kwargs['level'] = level
if args:
if len (args) == 1:
args, = args
kwargs['msg'] = args
# do not overwrite arguments
for k, v in self.bindings.items ():
if k not in kwargs:
kwargs[k] = v
for c in self.consumer:
kwargs = c (**kwargs)
return kwargs
def __getattr__ (self, k):
""" Bind all method names to level, so Logger.info, Logger.warning, … work """
return partial (self.__call__, k)
def bind (self, **kwargs):
d = self.bindings.copy ()
d.update (kwargs)
# consumer is not a copy intentionally, so attaching to the parent
# logger will attach to all children as well
return self.__class__ (consumer=self.consumer, bindings=d)
def unbind (self, **kwargs):
d = self.bindings.copy ()
for k in kwargs.keys ():
del d[k]
return self.__class__ (consumer=self.consumer, bindings=d)
def connect (self, consumer):
self.consumer.append (consumer)
def disconnect (self, consumer):
self.consumer.remove (consumer)
class Consumer:
def __call__ (self, level, *args, **kwargs):
raise NotImplementedError ()
class NullConsumer (Consumer):
def __call__ (self, **kwargs):
return kwargs
class PrintConsumer (Consumer):
"""
Simple printing consumer
"""
def __call__ (self, **kwargs):
sys.stderr.write (str (kwargs))
sys.stderr.write ('\n')
sys.stderr.flush ()
return kwargs
class JsonEncoder (json.JSONEncoder):
def default (self, obj):
if isinstance (obj, datetime):
return obj.isoformat ()
# make sure serialization always succeeds
try:
return json.JSONEncoder.default(self, obj)
except TypeError:
return str (obj)
class JsonPrintConsumer (Consumer):
def __init__ (self, minLevel=Level.INFO):
self.minLevel = minLevel
def __call__ (self, **kwargs):
if kwargs['level'] >= self.minLevel:
json.dump (kwargs, sys.stdout, cls=JsonEncoder)
sys.stdout.write ('\n')
sys.stdout.flush ()
return kwargs
class DatetimeConsumer (Consumer):
def __call__ (self, **kwargs):
kwargs['date'] = datetime.utcnow ().replace (tzinfo=utc)
return kwargs
class WarcHandlerConsumer (Consumer):
def __init__ (self, warc, minLevel=Level.INFO):
self.warc = warc
self.minLevel = minLevel
def __call__ (self, **kwargs):
if kwargs['level'] >= self.minLevel:
self.warc._writeLog (json.dumps (kwargs, cls=JsonEncoder))
return kwargs
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