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venv/Lib/site-packages/zmq/log/handlers.py

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+"""pyzmq logging handlers.
+
+This mainly defines the PUBHandler object for publishing logging messages over
+a zmq.PUB socket.
+
+The PUBHandler can be used with the regular logging module, as in::
+
+    >>> import logging
+    >>> handler = PUBHandler('tcp://127.0.0.1:12345')
+    >>> handler.root_topic = 'foo'
+    >>> logger = logging.getLogger('foobar')
+    >>> logger.setLevel(logging.DEBUG)
+    >>> logger.addHandler(handler)
+
+After this point, all messages logged by ``logger`` will be published on the
+PUB socket.
+
+Code adapted from StarCluster:
+
+    http://github.com/jtriley/StarCluster/blob/master/starcluster/logger.py
+"""
+
+# Copyright (C) PyZMQ Developers
+# Distributed under the terms of the Modified BSD License.
+
+
+import logging
+from logging import INFO, DEBUG, WARN, ERROR, FATAL
+
+import zmq
+from zmq.utils.strtypes import bytes, unicode, cast_bytes
+
+
+TOPIC_DELIM="::" # delimiter for splitting topics on the receiving end.
+
+
+class PUBHandler(logging.Handler):
+    """A basic logging handler that emits log messages through a PUB socket.
+
+    Takes a PUB socket already bound to interfaces or an interface to bind to.
+
+    Example::
+
+        sock = context.socket(zmq.PUB)
+        sock.bind('inproc://log')
+        handler = PUBHandler(sock)
+
+    Or::
+
+        handler = PUBHandler('inproc://loc')
+
+    These are equivalent.
+
+    Log messages handled by this handler are broadcast with ZMQ topics
+    ``this.root_topic`` comes first, followed by the log level
+    (DEBUG,INFO,etc.), followed by any additional subtopics specified in the
+    message by: log.debug("subtopic.subsub::the real message")
+    """
+
+    socket = None
+    
+    
+    def __init__(self, interface_or_socket, context=None, root_topic=''):
+        logging.Handler.__init__(self)
+        self._root_topic = root_topic
+        self.formatters = {
+            logging.DEBUG: logging.Formatter(
+            "%(levelname)s %(filename)s:%(lineno)d - %(message)s\n"),
+            logging.INFO: logging.Formatter("%(message)s\n"),
+            logging.WARN: logging.Formatter(
+            "%(levelname)s %(filename)s:%(lineno)d - %(message)s\n"),
+            logging.ERROR: logging.Formatter(
+            "%(levelname)s %(filename)s:%(lineno)d - %(message)s - %(exc_info)s\n"),
+            logging.CRITICAL: logging.Formatter(
+            "%(levelname)s %(filename)s:%(lineno)d - %(message)s\n")}
+        if isinstance(interface_or_socket, zmq.Socket):
+            self.socket = interface_or_socket
+            self.ctx = self.socket.context
+        else:
+            self.ctx = context or zmq.Context()
+            self.socket = self.ctx.socket(zmq.PUB)
+            self.socket.bind(interface_or_socket)
+
+    @property
+    def root_topic(self):
+        return self._root_topic
+
+    @root_topic.setter
+    def root_topic(self, value):
+        self.setRootTopic(value)
+
+    def setRootTopic(self, root_topic):
+        """Set the root topic for this handler.
+
+        This value is prepended to all messages published by this handler, and it
+        defaults to the empty string ''. When you subscribe to this socket, you must
+        set your subscription to an empty string, or to at least the first letter of
+        the binary representation of this string to ensure you receive any messages
+        from this handler.
+
+        If you use the default empty string root topic, messages will begin with
+        the binary representation of the log level string (INFO, WARN, etc.).
+        Note that ZMQ SUB sockets can have multiple subscriptions.
+        """
+        self._root_topic = root_topic
+
+    def setFormatter(self, fmt, level=logging.NOTSET):
+        """Set the Formatter for this handler.
+
+        If no level is provided, the same format is used for all levels. This
+        will overwrite all selective formatters set in the object constructor.
+        """
+        if level==logging.NOTSET:
+            for fmt_level in self.formatters.keys():
+                self.formatters[fmt_level] = fmt
+        else:
+            self.formatters[level] = fmt
+
+    def format(self,record):
+        """Format a record."""
+        return self.formatters[record.levelno].format(record)
+
+    def emit(self, record):
+        """Emit a log message on my socket."""
+        try:
+            topic, record.msg = record.msg.split(TOPIC_DELIM,1)
+        except Exception:
+            topic = ""
+        try:
+            bmsg = cast_bytes(self.format(record))
+        except Exception:
+            self.handleError(record)
+            return
+        
+        topic_list = []
+
+        if self.root_topic:
+            topic_list.append(self.root_topic)
+
+        topic_list.append(record.levelname)
+
+        if topic:
+            topic_list.append(topic)
+
+        btopic = b'.'.join(cast_bytes(t) for t in topic_list)
+
+        self.socket.send_multipart([btopic, bmsg])
+
+
+class TopicLogger(logging.Logger):
+    """A simple wrapper that takes an additional argument to log methods.
+
+    All the regular methods exist, but instead of one msg argument, two
+    arguments: topic, msg are passed.
+
+    That is::
+
+        logger.debug('msg')
+
+    Would become::
+
+        logger.debug('topic.sub', 'msg')
+    """
+    def log(self, level, topic, msg, *args, **kwargs):
+        """Log 'msg % args' with level and topic.
+
+        To pass exception information, use the keyword argument exc_info
+        with a True value::
+
+            logger.log(level, "zmq.fun", "We have a %s", 
+                    "mysterious problem", exc_info=1)
+        """
+        logging.Logger.log(self, level, '%s::%s'%(topic,msg), *args, **kwargs)
+
+# Generate the methods of TopicLogger, since they are just adding a
+# topic prefix to a message.
+for name in "debug warn warning error critical fatal".split():
+    meth = getattr(logging.Logger,name)
+    setattr(TopicLogger, name, 
+            lambda self, level, topic, msg, *args, **kwargs: 
+                meth(self, level, topic+TOPIC_DELIM+msg,*args, **kwargs))
+