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We don't use the PEP 282 logger implementation in the stdlib ('logging') because it's idiosyncratic and a bit slow for our purposes (we don't use threads). """ # This module must not depend on any non-stdlib modules to # avoid circular import problems import os import errno import sys import time import traceback from supervisor.compat import syslog from supervisor.compat import long from supervisor.compat import is_text_stream from supervisor.compat import as_string class LevelsByName: CRIT = 50 # messages that probably require immediate user attention ERRO = 40 # messages that indicate a potentially ignorable error condition WARN = 30 # messages that indicate issues which aren't errors INFO = 20 # normal informational output DEBG = 10 # messages useful for users trying to debug configurations TRAC = 5 # messages useful to developers trying to debug plugins BLAT = 3 # messages useful for developers trying to debug supervisor class LevelsByDescription: critical = LevelsByName.CRIT error = LevelsByName.ERRO warn = LevelsByName.WARN info = LevelsByName.INFO debug = LevelsByName.DEBG trace = LevelsByName.TRAC blather = LevelsByName.BLAT def _levelNumbers(): bynumber = {} for name, number in LevelsByName.__dict__.items(): if not name.startswith('_'): bynumber[number] = name return bynumber LOG_LEVELS_BY_NUM = _levelNumbers() def getLevelNumByDescription(description): num = getattr(LevelsByDescription, description, None) return num class Handler: fmt = '%(message)s' level = LevelsByName.INFO def __init__(self, stream=None): self.stream = stream self.closed = False def setFormat(self, fmt): self.fmt = fmt def setLevel(self, level): self.level = level def flush(self): try: self.stream.flush() except IOError as why: # if supervisor output is piped, EPIPE can be raised at exit if why.args[0] != errno.EPIPE: raise def close(self): if not self.closed: if hasattr(self.stream, 'fileno'): try: fd = self.stream.fileno() except IOError: # on python 3, io.IOBase objects always have fileno() # but calling it may raise io.UnsupportedOperation pass else: if fd < 3: # don't ever close stdout or stderr return self.stream.close() self.closed = True def emit(self, record): try: binary = (self.fmt == '%(message)s' and isinstance(record.msg, bytes) and (not record.kw or record.kw == {'exc_info': None})) binary_stream = not is_text_stream(self.stream) if binary: msg = record.msg else: msg = self.fmt % record.asdict() if binary_stream: msg = msg.encode('utf-8') try: self.stream.write(msg) except UnicodeError: # TODO sort out later # this only occurs because of a test stream type # which deliberately raises an exception the first # time it's called. So just do it again self.stream.write(msg) self.flush() except: self.handleError() def handleError(self): ei = sys.exc_info() traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr) del ei class StreamHandler(Handler): def __init__(self, strm=None): Handler.__init__(self, strm) def remove(self): if hasattr(self.stream, 'clear'): self.stream.clear() def reopen(self): pass class BoundIO: def __init__(self, maxbytes, buf=b''): self.maxbytes = maxbytes self.buf = buf def flush(self): pass def close(self): self.clear() def write(self, b): blen = len(b) if len(self.buf) + blen > self.maxbytes: self.buf = self.buf[blen:] self.buf += b def getvalue(self): return self.buf def clear(self): self.buf = b'' class FileHandler(Handler): """File handler which supports reopening of logs. """ def __init__(self, filename, mode='ab'): Handler.__init__(self) try: self.stream = open(filename, mode) except OSError as e: if mode == 'ab' and e.errno == errno.ESPIPE: # Python 3 can't open special files like # /dev/stdout in 'a' mode due to an implicit seek call # that fails with ESPIPE. Retry in 'w' mode. # See: http://bugs.python.org/issue27805 mode = 'wb' self.stream = open(filename, mode) else: raise self.baseFilename = filename self.mode = mode def reopen(self): self.close() self.stream = open(self.baseFilename, self.mode) self.closed = False def remove(self): self.close() try: os.remove(self.baseFilename) except OSError as why: if why.args[0] != errno.ENOENT: raise class RotatingFileHandler(FileHandler): def __init__(self, filename, mode='ab', maxBytes=512*1024*1024, backupCount=10): """ 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. """ if maxBytes > 0: mode = 'ab' # doesn't make sense otherwise! FileHandler.__init__(self, filename, mode) self.maxBytes = maxBytes self.backupCount = backupCount self.counter = 0 self.every = 10 def emit(self, record): """ Emit a record. Output the record to the file, catering for rollover as described in doRollover(). """ FileHandler.emit(self, record) self.doRollover() def _remove(self, fn): # pragma: no cover # this is here to service stubbing in unit tests return os.remove(fn) def _rename(self, src, tgt): # pragma: no cover # this is here to service stubbing in unit tests return os.rename(src, tgt) def _exists(self, fn): # pragma: no cover # this is here to service stubbing in unit tests return os.path.exists(fn) def removeAndRename(self, sfn, dfn): if self._exists(dfn): try: self._remove(dfn) except OSError as why: # catch race condition (destination already deleted) if why.args[0] != errno.ENOENT: raise try: self._rename(sfn, dfn) except OSError as why: # catch exceptional condition (source deleted) # E.g. cleanup script removes active log. if why.args[0] != errno.ENOENT: raise def doRollover(self): """ Do a rollover, as described in __init__(). """ if self.maxBytes <= 0: return if not (self.stream.tell() >= self.maxBytes): return 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): self.removeAndRename(sfn, dfn) dfn = self.baseFilename + ".1" self.removeAndRename(self.baseFilename, dfn) self.stream = open(self.baseFilename, 'wb') class LogRecord: def __init__(self, level, msg, **kw): self.level = level self.msg = msg self.kw = kw self.dictrepr = None def asdict(self): if self.dictrepr is None: now = time.time() msecs = (now - long(now)) * 1000 part1 = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(now)) asctime = '%s,%03d' % (part1, msecs) levelname = LOG_LEVELS_BY_NUM[self.level] msg = as_string(self.msg) if self.kw: msg = msg % self.kw self.dictrepr = {'message':msg, 'levelname':levelname, 'asctime':asctime} return self.dictrepr class Logger: def __init__(self, level=None, handlers=None): if level is None: level = LevelsByName.INFO self.level = level if handlers is None: handlers = [] self.handlers = handlers def close(self): for handler in self.handlers: handler.close() def blather(self, msg, **kw): if LevelsByName.BLAT >= self.level: self.log(LevelsByName.BLAT, msg, **kw) def trace(self, msg, **kw): if LevelsByName.TRAC >= self.level: self.log(LevelsByName.TRAC, msg, **kw) def debug(self, msg, **kw): if LevelsByName.DEBG >= self.level: self.log(LevelsByName.DEBG, msg, **kw) def info(self, msg, **kw): if LevelsByName.INFO >= self.level: self.log(LevelsByName.INFO, msg, **kw) def warn(self, msg, **kw): if LevelsByName.WARN >= self.level: self.log(LevelsByName.WARN, msg, **kw) def error(self, msg, **kw): if LevelsByName.ERRO >= self.level: self.log(LevelsByName.ERRO, msg, **kw) def critical(self, msg, **kw): if LevelsByName.CRIT >= self.level: self.log(LevelsByName.CRIT, msg, **kw) def log(self, level, msg, **kw): record = LogRecord(level, msg, **kw) for handler in self.handlers: if level >= handler.level: handler.emit(record) def addHandler(self, hdlr): self.handlers.append(hdlr) def getvalue(self): raise NotImplementedError class SyslogHandler(Handler): def __init__(self): Handler.__init__(self) assert syslog is not None, "Syslog module not present" def close(self): pass def reopen(self): pass def _syslog(self, msg): # pragma: no cover # this exists only for unit test stubbing syslog.syslog(msg) def emit(self, record): try: params = record.asdict() message = params['message'] for line in message.rstrip('\n').split('\n'): params['message'] = line msg = self.fmt % params try: self._syslog(msg) except UnicodeError: self._syslog(msg.encode("UTF-8")) except: self.handleError() def getLogger(level=None): return Logger(level) _2MB = 1<<21 def handle_boundIO(logger, fmt, maxbytes=_2MB): io = BoundIO(maxbytes) handler = StreamHandler(io) handler.setLevel(logger.level) handler.setFormat(fmt) logger.addHandler(handler) logger.getvalue = io.getvalue return logger def handle_stdout(logger, fmt): handler = StreamHandler(sys.stdout) handler.setFormat(fmt) handler.setLevel(logger.level) logger.addHandler(handler) def handle_syslog(logger, fmt): handler = SyslogHandler() handler.setFormat(fmt) handler.setLevel(logger.level) logger.addHandler(handler) def handle_file(logger, filename, fmt, rotating=False, maxbytes=0, backups=0): if filename == 'syslog': handler = SyslogHandler() else: if rotating is False: handler = FileHandler(filename) else: handler = RotatingFileHandler(filename, 'a', maxbytes, backups) handler.setFormat(fmt) handler.setLevel(logger.level) logger.addHandler(handler) return logger