# Copyright 2001-2004 by Vinay Sajip. All Rights Reserved. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose and without fee is hereby granted, # provided that the above copyright notice appear in all copies and that # both that copyright notice and this permission notice appear in # supporting documentation, and that the name of Vinay Sajip # not be used in advertising or publicity pertaining to distribution # of the software without specific, written prior permission. # VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING # ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL # VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR # ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER # IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """ Additional handlers for the logging package for Python. The core package is based on PEP 282 and comments thereto in comp.lang.python, and influenced by Apache's log4j system. Should work under Python versions >= 1.5.2, except that source line information is not available unless 'sys._getframe()' is. Copyright (C) 2001-2004 Vinay Sajip. All Rights Reserved. To use, simply 'import logging' and log away! """ import sys, logging, socket, types, os, string, cPickle, struct, time # # Some constants... # DEFAULT_TCP_LOGGING_PORT = 9020 DEFAULT_UDP_LOGGING_PORT = 9021 DEFAULT_HTTP_LOGGING_PORT = 9022 DEFAULT_SOAP_LOGGING_PORT = 9023 SYSLOG_UDP_PORT = 514 class RotatingFileHandler(logging.FileHandler): def __init__(self, filename, mode="a", maxBytes=0, backupCount=0): """ Open the specified file and use it as the stream for logging. By default, the file grows indefinitely. You can specify particular values of maxBytes and backupCount to allow the file to rollover at a predetermined size. Rollover occurs whenever the current log file is nearly maxBytes in length. If backupCount is >= 1, the system will successively create new files with the same pathname as the base file, but with extensions ".1", ".2" etc. appended to it. For example, with a backupCount of 5 and a base file name of "app.log", you would get "app.log", "app.log.1", "app.log.2", ... through to "app.log.5". The file being written to is always "app.log" - when it gets filled up, it is closed and renamed to "app.log.1", and if files "app.log.1", "app.log.2" etc. exist, then they are renamed to "app.log.2", "app.log.3" etc. respectively. If maxBytes is zero, rollover never occurs. """ logging.FileHandler.__init__(self, filename, mode) self.maxBytes = maxBytes self.backupCount = backupCount if maxBytes > 0: self.mode = "a" def doRollover(self): """ Do a rollover, as described in __init__(). """ self.stream.close() if self.backupCount > 0: for i in range(self.backupCount - 1, 0, -1): sfn = "%s.%d" % (self.baseFilename, i) dfn = "%s.%d" % (self.baseFilename, i + 1) if os.path.exists(sfn): #print "%s -> %s" % (sfn, dfn) if os.path.exists(dfn): os.remove(dfn) os.rename(sfn, dfn) dfn = self.baseFilename + ".1" if os.path.exists(dfn): os.remove(dfn) os.rename(self.baseFilename, dfn) #print "%s -> %s" % (self.baseFilename, dfn) self.stream = open(self.baseFilename, "w") def emit(self, record): """ Emit a record. Output the record to the file, catering for rollover as described in doRollover(). """ if self.maxBytes > 0: # are we rolling over? msg = "%s\n" % self.format(record) self.stream.seek(0, 2) #due to non-posix-compliant Windows feature if self.stream.tell() + len(msg) >= self.maxBytes: self.doRollover() logging.FileHandler.emit(self, record) class SocketHandler(logging.Handler): """ A handler class which writes logging records, in pickle format, to a streaming socket. The socket is kept open across logging calls. If the peer resets it, an attempt is made to reconnect on the next call. The pickle which is sent is that of the LogRecord's attribute dictionary (__dict__), so that the receiver does not need to have the logging module installed in order to process the logging event. To unpickle the record at the receiving end into a LogRecord, use the makeLogRecord function. """ def __init__(self, host, port): """ Initializes the handler with a specific host address and port. The attribute 'closeOnError' is set to 1 - which means that if a socket error occurs, the socket is silently closed and then reopened on the next logging call. """ logging.Handler.__init__(self) self.host = host self.port = port self.sock = None self.closeOnError = 0 self.retryTime = None # # Exponential backoff parameters. # self.retryStart = 1.0 self.retryMax = 30.0 self.retryFactor = 2.0 def makeSocket(self): """ A factory method which allows subclasses to define the precise type of socket they want. """ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((self.host, self.port)) return s def createSocket(self): """ Try to create a socket, using an exponential backoff with a max retry time. Thanks to Robert Olson for the original patch (SF #815911) which has been slightly refactored. """ now = time.time() # Either retryTime is None, in which case this # is the first time back after a disconnect, or # we've waited long enough. if self.retryTime is None: attempt = 1 else: attempt = (now >= self.retryTime) if attempt: try: self.sock = self.makeSocket() self.retryTime = None # next time, no delay before trying except: #Creation failed, so set the retry time and return. if self.retryTime is None: self.retryPeriod = self.retryStart else: self.retryPeriod = self.retryPeriod * self.retryFactor if self.retryPeriod > self.retryMax: self.retryPeriod = self.retryMax self.retryTime = now + self.retryPeriod def send(self, s): """ Send a pickled string to the socket. This function allows for partial sends which can happen when the network is busy. """ if self.sock is None: self.createSocket() #self.sock can be None either because we haven't reached the retry #time yet, or because we have reached the retry time and retried, #but are still unable to connect. if self.sock: try: if hasattr(self.sock, "sendall"): self.sock.sendall(s) else: sentsofar = 0 left = len(s) while left > 0: sent = self.sock.send(s[sentsofar:]) sentsofar = sentsofar + sent left = left - sent except socket.error: self.sock.close() self.sock = None # so we can call createSocket next time def makePickle(self, record): """ Pickles the record in binary format with a length prefix, and returns it ready for transmission across the socket. """ ei = record.exc_info if ei: dummy = self.format(record) # just to get traceback text into record.exc_text record.exc_info = None # to avoid Unpickleable error s = cPickle.dumps(record.__dict__, 1) if ei: record.exc_info = ei # for next handler slen = struct.pack(">L", len(s)) return slen + s def handleError(self, record): """ Handle an error during logging. An error has occurred during logging. Most likely cause - connection lost. Close the socket so that we can retry on the next event. """ if self.closeOnError and self.sock: self.sock.close() self.sock = None #try to reconnect next time else: logging.Handler.handleError(self, record) def emit(self, record): """ Emit a record. Pickles the record and writes it to the socket in binary format. If there is an error with the socket, silently drop the packet. If there was a problem with the socket, re-establishes the socket. """ try: s = self.makePickle(record) self.send(s) except: self.handleError(record) def close(self): """ Closes the socket. """ if self.sock: self.sock.close() self.sock = None logging.Handler.close(self) class DatagramHandler(SocketHandler): """ A handler class which writes logging records, in pickle format, to a datagram socket. The pickle which is sent is that of the LogRecord's attribute dictionary (__dict__), so that the receiver does not need to have the logging module installed in order to process the logging event. To unpickle the record at the receiving end into a LogRecord, use the makeLogRecord function. """ def __init__(self, host, port): """ Initializes the handler with a specific host address and port. """ SocketHandler.__init__(self, host, port) self.closeOnError = 0 def makeSocket(self): """ The factory method of SocketHandler is here overridden to create a UDP socket (SOCK_DGRAM). """ s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) return s def send(self, s): """ Send a pickled string to a socket. This function no longer allows for partial sends which can happen when the network is busy - UDP does not guarantee delivery and can deliver packets out of sequence. """ self.sock.sendto(s, (self.host, self.port)) class SysLogHandler(logging.Handler): """ A handler class which sends formatted logging records to a syslog server. Based on Sam Rushing's syslog module: http://www.nightmare.com/squirl/python-ext/misc/syslog.py Contributed by Nicolas Untz (after which minor refactoring changes have been made). """ # from : # ====================================================================== # priorities/facilities are encoded into a single 32-bit quantity, where # the bottom 3 bits are the priority (0-7) and the top 28 bits are the # facility (0-big number). Both the priorities and the facilities map # roughly one-to-one to strings in the syslogd(8) source code. This # mapping is included in this file. # # priorities (these are ordered) LOG_EMERG = 0 # system is unusable LOG_ALERT = 1 # action must be taken immediately LOG_CRIT = 2 # critical conditions LOG_ERR = 3 # error conditions LOG_WARNING = 4 # warning conditions LOG_NOTICE = 5 # normal but significant condition LOG_INFO = 6 # informational LOG_DEBUG = 7 # debug-level messages # facility codes LOG_KERN = 0 # kernel messages LOG_USER = 1 # random user-level messages LOG_MAIL = 2 # mail system LOG_DAEMON = 3 # system daemons LOG_AUTH = 4 # security/authorization messages LOG_SYSLOG = 5 # messages generated internally by syslogd LOG_LPR = 6 # line printer subsystem LOG_NEWS = 7 # network news subsystem LOG_UUCP = 8 # UUCP subsystem LOG_CRON = 9 # clock daemon LOG_AUTHPRIV = 10 # security/authorization messages (private) # other codes through 15 reserved for system use LOG_LOCAL0 = 16 # reserved for local use LOG_LOCAL1 = 17 # reserved for local use LOG_LOCAL2 = 18 # reserved for local use LOG_LOCAL3 = 19 # reserved for local use LOG_LOCAL4 = 20 # reserved for local use LOG_LOCAL5 = 21 # reserved for local use LOG_LOCAL6 = 22 # reserved for local use LOG_LOCAL7 = 23 # reserved for local use priority_names = { "alert": LOG_ALERT, "crit": LOG_CRIT, "critical": LOG_CRIT, "debug": LOG_DEBUG, "emerg": LOG_EMERG, "err": LOG_ERR, "error": LOG_ERR, # DEPRECATED "info": LOG_INFO, "notice": LOG_NOTICE, "panic": LOG_EMERG, # DEPRECATED "warn": LOG_WARNING, # DEPRECATED "warning": LOG_WARNING, } facility_names = { "auth": LOG_AUTH, "authpriv": LOG_AUTHPRIV, "cron": LOG_CRON, "daemon": LOG_DAEMON, "kern": LOG_KERN, "lpr": LOG_LPR, "mail": LOG_MAIL, "news": LOG_NEWS, "security": LOG_AUTH, # DEPRECATED "syslog": LOG_SYSLOG, "user": LOG_USER, "uucp": LOG_UUCP, "local0": LOG_LOCAL0, "local1": LOG_LOCAL1, "local2": LOG_LOCAL2, "local3": LOG_LOCAL3, "local4": LOG_LOCAL4, "local5": LOG_LOCAL5, "local6": LOG_LOCAL6, "local7": LOG_LOCAL7, } def __init__(self, address=('localhost', SYSLOG_UDP_PORT), facility=LOG_USER): """ Initialize a handler. If address is specified as a string, UNIX socket is used. If facility is not specified, LOG_USER is used. """ logging.Handler.__init__(self) self.address = address self.facility = facility if type(address) == types.StringType: self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM) # syslog may require either DGRAM or STREAM sockets try: self.socket.connect(address) except socket.error: self.socket.close() self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) self.socket.connect(address) self.unixsocket = 1 else: self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self.unixsocket = 0 self.formatter = None # curious: when talking to the unix-domain '/dev/log' socket, a # zero-terminator seems to be required. this string is placed # into a class variable so that it can be overridden if # necessary. log_format_string = '<%d>%s\000' def encodePriority (self, facility, priority): """ Encode the facility and priority. You can pass in strings or integers - if strings are passed, the facility_names and priority_names mapping dictionaries are used to convert them to integers. """ if type(facility) == types.StringType: facility = self.facility_names[facility] if type(priority) == types.StringType: priority = self.priority_names[priority] return (facility << 3) | priority def close (self): """ Closes the socket. """ if self.unixsocket: self.socket.close() logging.Handler.close(self) def emit(self, record): """ Emit a record. The record is formatted, and then sent to the syslog server. If exception information is present, it is NOT sent to the server. """ msg = self.format(record) """ We need to convert record level to lowercase, maybe this will change in the future. """ msg = self.log_format_string % ( self.encodePriority(self.facility, string.lower(record.levelname)), msg) try: if self.unixsocket: self.socket.send(msg) else: self.socket.sendto(msg, self.address) except: self.handleError(record) class SMTPHandler(logging.Handler): """ A handler class which sends an SMTP email for each logging event. """ def __init__(self, mailhost, fromaddr, toaddrs, subject): """ Initialize the handler. Initialize the instance with the from and to addresses and subject line of the email. To specify a non-standard SMTP port, use the (host, port) tuple format for the mailhost argument. """ logging.Handler.__init__(self) if type(mailhost) == types.TupleType: host, port = mailhost self.mailhost = host self.mailport = port else: self.mailhost = mailhost self.mailport = None self.fromaddr = fromaddr if type(toaddrs) == types.StringType: toaddrs = [toaddrs] self.toaddrs = toaddrs self.subject = subject def getSubject(self, record): """ Determine the subject for the email. If you want to specify a subject line which is record-dependent, override this method. """ return self.subject weekdayname = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'] monthname = [None, 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] def date_time(self): """Return the current date and time formatted for a MIME header.""" year, month, day, hh, mm, ss, wd, y, z = time.gmtime(time.time()) s = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % ( self.weekdayname[wd], day, self.monthname[month], year, hh, mm, ss) return s def emit(self, record): """ Emit a record. Format the record and send it to the specified addressees. """ try: import smtplib port = self.mailport if not port: port = smtplib.SMTP_PORT smtp = smtplib.SMTP(self.mailhost, port) msg = self.format(record) msg = "From: %s\r\nTo: %s\r\nSubject: %s\r\nDate: %s\r\n\r\n%s" % ( self.fromaddr, string.join(self.toaddrs, ","), self.getSubject(record), self.date_time(), msg) smtp.sendmail(self.fromaddr, self.toaddrs, msg) smtp.quit() except: self.handleError(record) class NTEventLogHandler(logging.Handler): """ A handler class which sends events to the NT Event Log. Adds a registry entry for the specified application name. If no dllname is provided, win32service.pyd (which contains some basic message placeholders) is used. Note that use of these placeholders will make your event logs big, as the entire message source is held in the log. If you want slimmer logs, you have to pass in the name of your own DLL which contains the message definitions you want to use in the event log. """ def __init__(self, appname, dllname=None, logtype="Application"): logging.Handler.__init__(self) try: import win32evtlogutil, win32evtlog self.appname = appname self._welu = win32evtlogutil if not dllname: dllname = os.path.split(self._welu.__file__) dllname = os.path.split(dllname[0]) dllname = os.path.join(dllname[0], r'win32service.pyd') self.dllname = dllname self.logtype = logtype self._welu.AddSourceToRegistry(appname, dllname, logtype) self.deftype = win32evtlog.EVENTLOG_ERROR_TYPE self.typemap = { logging.DEBUG : win32evtlog.EVENTLOG_INFORMATION_TYPE, logging.INFO : win32evtlog.EVENTLOG_INFORMATION_TYPE, logging.WARNING : win32evtlog.EVENTLOG_WARNING_TYPE, logging.ERROR : win32evtlog.EVENTLOG_ERROR_TYPE, logging.CRITICAL: win32evtlog.EVENTLOG_ERROR_TYPE, } except ImportError: print "The Python Win32 extensions for NT (service, event "\ "logging) appear not to be available." self._welu = None def getMessageID(self, record): """ Return the message ID for the event record. If you are using your own messages, you could do this by having the msg passed to the logger being an ID rather than a formatting string. Then, in here, you could use a dictionary lookup to get the message ID. This version returns 1, which is the base message ID in win32service.pyd. """ return 1 def getEventCategory(self, record): """ Return the event category for the record. Override this if you want to specify your own categories. This version returns 0. """ return 0 def getEventType(self, record): """ Return the event type for the record. Override this if you want to specify your own types. This version does a mapping using the handler's typemap attribute, which is set up in __init__() to a dictionary which contains mappings for DEBUG, INFO, WARNING, ERROR and CRITICAL. If you are using your own levels you will either need to override this method or place a suitable dictionary in the handler's typemap attribute. """ return self.typemap.get(record.levelno, self.deftype) def emit(self, record): """ Emit a record. Determine the message ID, event category and event type. Then log the message in the NT event log. """ if self._welu: try: id = self.getMessageID(record) cat = self.getEventCategory(record) type = self.getEventType(record) msg = self.format(record) self._welu.ReportEvent(self.appname, id, cat, type, [msg]) except: self.handleError(record) def close(self): """ Clean up this handler. You can remove the application name from the registry as a source of event log entries. However, if you do this, you will not be able to see the events as you intended in the Event Log Viewer - it needs to be able to access the registry to get the DLL name. """ #self._welu.RemoveSourceFromRegistry(self.appname, self.logtype) logging.Handler.close(self) class HTTPHandler(logging.Handler): """ A class which sends records to a Web server, using either GET or POST semantics. """ def __init__(self, host, url, method="GET"): """ Initialize the instance with the host, the request URL, and the method ("GET" or "POST") """ logging.Handler.__init__(self) method = string.upper(method) if method not in ["GET", "POST"]: raise ValueError, "method must be GET or POST" self.host = host self.url = url self.method = method def mapLogRecord(self, record): """ Default implementation of mapping the log record into a dict that is sent as the CGI data. Overwrite in your class. Contributed by Franz Glasner. """ return record.__dict__ def emit(self, record): """ Emit a record. Send the record to the Web server as an URL-encoded dictionary """ try: import httplib, urllib h = httplib.HTTP(self.host) url = self.url data = urllib.urlencode(self.mapLogRecord(record)) if self.method == "GET": if (string.find(url, '?') >= 0): sep = '&' else: sep = '?' url = url + "%c%s" % (sep, data) h.putrequest(self.method, url) if self.method == "POST": h.putheader("Content-length", str(len(data))) h.endheaders() if self.method == "POST": h.send(data) h.getreply() #can't do anything with the result except: self.handleError(record) class BufferingHandler(logging.Handler): """ A handler class which buffers logging records in memory. Whenever each record is added to the buffer, a check is made to see if the buffer should be flushed. If it should, then flush() is expected to do what's needed. """ def __init__(self, capacity): """ Initialize the handler with the buffer size. """ logging.Handler.__init__(self) self.capacity = capacity self.buffer = [] def shouldFlush(self, record): """ Should the handler flush its buffer? Returns true if the buffer is up to capacity. This method can be overridden to implement custom flushing strategies. """ return (len(self.buffer) >= self.capacity) def emit(self, record): """ Emit a record. Append the record. If shouldFlush() tells us to, call flush() to process the buffer. """ self.buffer.append(record) if self.shouldFlush(record): self.flush() def flush(self): """ Override to implement custom flushing behaviour. This version just zaps the buffer to empty. """ self.buffer = [] def close(self): """ Close the handler. This version just flushes and chains to the parent class' close(). """ self.flush() logging.Handler.close(self) class MemoryHandler(BufferingHandler): """ A handler class which buffers logging records in memory, periodically flushing them to a target handler. Flushing occurs whenever the buffer is full, or when an event of a certain severity or greater is seen. """ def __init__(self, capacity, flushLevel=logging.ERROR, target=None): """ Initialize the handler with the buffer size, the level at which flushing should occur and an optional target. Note that without a target being set either here or via setTarget(), a MemoryHandler is no use to anyone! """ BufferingHandler.__init__(self, capacity) self.flushLevel = flushLevel self.target = target def shouldFlush(self, record): """ Check for buffer full or a record at the flushLevel or higher. """ return (len(self.buffer) >= self.capacity) or \ (record.levelno >= self.flushLevel) def setTarget(self, target): """ Set the target handler for this handler. """ self.target = target def flush(self): """ For a MemoryHandler, flushing means just sending the buffered records to the target, if there is one. Override if you want different behaviour. """ if self.target: for record in self.buffer: self.target.handle(record) self.buffer = [] def close(self): """ Flush, set the target to None and lose the buffer. """ self.flush() self.target = None BufferingHandler.close(self)