|
|
"""
|
|
|
A simple logger object that consolidates messages incoming from ipcluster processes.
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* MinRK
|
|
|
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2011 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
import logging
|
|
|
import sys
|
|
|
|
|
|
import zmq
|
|
|
from zmq.eventloop import ioloop, zmqstream
|
|
|
|
|
|
from IPython.config.configurable import LoggingConfigurable
|
|
|
from IPython.utils.localinterfaces import LOCALHOST
|
|
|
from IPython.utils.traitlets import Int, Unicode, Instance, List
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Classes
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class LogWatcher(LoggingConfigurable):
|
|
|
"""A simple class that receives messages on a SUB socket, as published
|
|
|
by subclasses of `zmq.log.handlers.PUBHandler`, and logs them itself.
|
|
|
|
|
|
This can subscribe to multiple topics, but defaults to all topics.
|
|
|
"""
|
|
|
|
|
|
# configurables
|
|
|
topics = List([''], config=True,
|
|
|
help="The ZMQ topics to subscribe to. Default is to subscribe to all messages")
|
|
|
url = Unicode('tcp://%s:20202' % LOCALHOST, config=True,
|
|
|
help="ZMQ url on which to listen for log messages")
|
|
|
|
|
|
# internals
|
|
|
stream = Instance('zmq.eventloop.zmqstream.ZMQStream')
|
|
|
|
|
|
context = Instance(zmq.Context)
|
|
|
def _context_default(self):
|
|
|
return zmq.Context.instance()
|
|
|
|
|
|
loop = Instance(zmq.eventloop.ioloop.IOLoop)
|
|
|
def _loop_default(self):
|
|
|
return ioloop.IOLoop.instance()
|
|
|
|
|
|
def __init__(self, **kwargs):
|
|
|
super(LogWatcher, self).__init__(**kwargs)
|
|
|
s = self.context.socket(zmq.SUB)
|
|
|
s.bind(self.url)
|
|
|
self.stream = zmqstream.ZMQStream(s, self.loop)
|
|
|
self.subscribe()
|
|
|
self.on_trait_change(self.subscribe, 'topics')
|
|
|
|
|
|
def start(self):
|
|
|
self.stream.on_recv(self.log_message)
|
|
|
|
|
|
def stop(self):
|
|
|
self.stream.stop_on_recv()
|
|
|
|
|
|
def subscribe(self):
|
|
|
"""Update our SUB socket's subscriptions."""
|
|
|
self.stream.setsockopt(zmq.UNSUBSCRIBE, '')
|
|
|
if '' in self.topics:
|
|
|
self.log.debug("Subscribing to: everything")
|
|
|
self.stream.setsockopt(zmq.SUBSCRIBE, '')
|
|
|
else:
|
|
|
for topic in self.topics:
|
|
|
self.log.debug("Subscribing to: %r"%(topic))
|
|
|
self.stream.setsockopt(zmq.SUBSCRIBE, topic)
|
|
|
|
|
|
def _extract_level(self, topic_str):
|
|
|
"""Turn 'engine.0.INFO.extra' into (logging.INFO, 'engine.0.extra')"""
|
|
|
topics = topic_str.split('.')
|
|
|
for idx,t in enumerate(topics):
|
|
|
level = getattr(logging, t, None)
|
|
|
if level is not None:
|
|
|
break
|
|
|
|
|
|
if level is None:
|
|
|
level = logging.INFO
|
|
|
else:
|
|
|
topics.pop(idx)
|
|
|
|
|
|
return level, '.'.join(topics)
|
|
|
|
|
|
|
|
|
def log_message(self, raw):
|
|
|
"""receive and parse a message, then log it."""
|
|
|
if len(raw) != 2 or '.' not in raw[0]:
|
|
|
self.log.error("Invalid log message: %s"%raw)
|
|
|
return
|
|
|
else:
|
|
|
topic, msg = raw
|
|
|
# don't newline, since log messages always newline:
|
|
|
topic,level_name = topic.rsplit('.',1)
|
|
|
level,topic = self._extract_level(topic)
|
|
|
if msg[-1] == '\n':
|
|
|
msg = msg[:-1]
|
|
|
self.log.log(level, "[%s] %s" % (topic, msg))
|
|
|
|
|
|
|
