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See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # __all__ = [ "LogTarget", "FileLog", "Logger", "log" ] import sys import types import time import inspect import fnmatch import syslog import traceback import fcntl import os.path import os # --------------------------------------------------------------------------- # abstract class for logging targets class LogTarget(object): """ Abstract class for logging targets. """ def __init__(self): self.fd = None def write(self, data, level, logger, is_debug=0): raise NotImplementedError("LogTarget.write is an abstract method") def flush(self): raise NotImplementedError("LogTarget.flush is an abstract method") def close(self): raise NotImplementedError("LogTarget.close is an abstract method") # --------------------------------------------------------------------------- # private class for stdout class _StdoutLog(LogTarget): def __init__(self): LogTarget.__init__(self) self.fd = sys.stdout def write(self, data, level, logger, is_debug=0): # ignore level self.fd.write(data) self.flush() def close(self): self.flush() def flush(self): self.fd.flush() # --------------------------------------------------------------------------- # private class for stderr class _StderrLog(_StdoutLog): def __init__(self): _StdoutLog.__init__(self) self.fd = sys.stderr # --------------------------------------------------------------------------- # private class for syslog class _SyslogLog(LogTarget): def __init__(self): # Only initialize LogTarget here as fs should be None LogTarget.__init__(self) # # Derived from: https://github.com/canvon/firewalld/commit/af0edfee1cc1891b7b13f302ca5911b24e9b0f13 # # Work around Python issue 27875, "Syslogs /usr/sbin/foo as /foo # instead of as foo" # (but using openlog explicitly might be better anyway) # # Set ident to basename, log PID as well, and log to facility "daemon". syslog.openlog(os.path.basename(sys.argv[0]), syslog.LOG_PID, syslog.LOG_DAEMON) def write(self, data, level, logger, is_debug=0): priority = None if is_debug: priority = syslog.LOG_DEBUG else: if level >= logger.INFO1: priority = syslog.LOG_INFO elif level == logger.WARNING: priority = syslog.LOG_WARNING elif level == logger.ERROR: priority = syslog.LOG_ERR elif level == logger.FATAL: priority = syslog.LOG_CRIT if data.endswith("\n"): data = data[:len(data)-1] if len(data) > 0: if priority is None: syslog.syslog(data) else: syslog.syslog(priority, data) def close(self): syslog.closelog() def flush(self): pass # --------------------------------------------------------------------------- class FileLog(LogTarget): """ FileLog class. File will be opened on the first write. """ def __init__(self, filename, mode="w"): LogTarget.__init__(self) self.filename = filename self.mode = mode def open(self): if self.fd: return flags = os.O_CREAT | os.O_WRONLY if self.mode.startswith('a'): flags |= os.O_APPEND self.fd = os.open(self.filename, flags, 0o640) # Make sure that existing file has correct perms os.fchmod(self.fd, 0o640) # Make it an object self.fd = os.fdopen(self.fd, self.mode) fcntl.fcntl(self.fd, fcntl.F_SETFD, fcntl.FD_CLOEXEC) def write(self, data, level, logger, is_debug=0): if not self.fd: self.open() self.fd.write(data) self.fd.flush() def close(self): if not self.fd: return self.fd.close() self.fd = None def flush(self): if not self.fd: return self.fd.flush() # --------------------------------------------------------------------------- class Logger(object): r""" Format string: %(class)s Calling class the function belongs to, else empty %(date)s Date using Logger.date_format, see time module %(domain)s Full Domain: %(module)s.%(class)s.%(function)s %(file)s Filename of the module %(function)s Function name, empty in __main__ %(label)s Label according to log function call from Logger.label %(level)d Internal logging level %(line)d Line number in module %(module)s Module name %(message)s Log message Standard levels: FATAL Fatal error messages ERROR Error messages WARNING Warning messages INFOx, x in [1..5] Information DEBUGy, y in [1..10] Debug messages NO_INFO No info output NO_DEBUG No debug output INFO_MAX Maximum info level DEBUG_MAX Maximum debug level x and y depend on info_max and debug_max from Logger class initialization. See __init__ function. Default logging targets: stdout Logs to stdout stderr Logs to stderr syslog Logs to syslog Additional arguments for logging functions (fatal, error, warning, info and debug): nl Disable newline at the end with nl=0, default is nl=1. fmt Format string for this logging entry, overloads global format string. Example: fmt="%(file)s:%(line)d %(message)s" nofmt Only output message with nofmt=1. The nofmt argument wins over the fmt argument. Example: from logger import log log.setInfoLogLevel(log.INFO1) log.setDebugLogLevel(log.DEBUG1) for i in range(1, log.INFO_MAX+1): log.setInfoLogLabel(i, "INFO%d: " % i) log.setFormat("%(date)s %(module)s:%(line)d [%(domain)s] %(label)s: " "%(level)d %(message)s") log.setDateFormat("%Y-%m-%d %H:%M:%S") fl = FileLog("/tmp/log", "a") log.addInfoLogging("*", fl) log.addDebugLogging("*", fl) log.addInfoLogging("*", log.syslog, fmt="%(label)s%(message)s") log.debug3("debug3") log.debug2("debug2") log.debug1("debug1") log.info2("info2") log.info1("info1") log.warning("warning\n", nl=0) log.error("error\n", nl=0) log.fatal("fatal") log.info(log.INFO1, "nofmt info", nofmt=1) """ ALL = -5 NOTHING = -4 FATAL = -3 TRACEBACK = -2 ERROR = -1 WARNING = 0 # Additional levels are generated in class initilization stdout = _StdoutLog() stderr = _StderrLog() syslog = _SyslogLog() def __init__(self, info_max=5, debug_max=10): """ Logger class initialization """ self._level = { } self._debug_level = { } self._format = "" self._date_format = "" self._label = { } self._debug_label = { } self._logging = { } self._debug_logging = { } self._domains = { } self._debug_domains = { } # INFO1 is required for standard log level if info_max < 1: raise ValueError("Logger: info_max %d is too low" % info_max) if debug_max < 0: raise ValueError("Logger: debug_max %d is too low" % debug_max) self.NO_INFO = self.WARNING # = 0 self.INFO_MAX = info_max self.NO_DEBUG = 0 self.DEBUG_MAX = debug_max self.setInfoLogLabel(self.FATAL, "FATAL ERROR: ") self.setInfoLogLabel(self.TRACEBACK, "") self.setInfoLogLabel(self.ERROR, "ERROR: ") self.setInfoLogLabel(self.WARNING, "WARNING: ") # generate info levels and infox functions for _level in range(1, self.INFO_MAX+1): setattr(self, "INFO%d" % _level, _level) self.setInfoLogLabel(_level, "") setattr(self, "info%d" % (_level), (lambda self, x: lambda message, *args, **kwargs: self.info(x, message, *args, **kwargs))(self, _level)) # pylint: disable=E0602 # generate debug levels and debugx functions for _level in range(1, self.DEBUG_MAX+1): setattr(self, "DEBUG%d" % _level, _level) self.setDebugLogLabel(_level, "DEBUG%d: " % _level) setattr(self, "debug%d" % (_level), (lambda self, x: lambda message, *args, **kwargs: self.debug(x, message, *args, **kwargs))(self, _level)) # pylint: disable=E0602 # set initial log levels, formats and targets self.setInfoLogLevel(self.INFO1) self.setDebugLogLevel(self.NO_DEBUG) self.setFormat("%(label)s%(message)s") self.setDateFormat("%d %b %Y %H:%M:%S") self.setInfoLogging("*", self.stderr, [ self.FATAL, self.ERROR, self.WARNING ]) self.setInfoLogging("*", self.stdout, [ i for i in range(self.INFO1, self.INFO_MAX+1) ]) self.setDebugLogging("*", self.stdout, [ i for i in range(1, self.DEBUG_MAX+1) ]) def close(self): """ Close all logging targets """ for level in range(self.FATAL, self.DEBUG_MAX+1): if level not in self._logging: continue for (dummy, target, dummy) in self._logging[level]: target.close() def getInfoLogLevel(self, domain="*"): """ Get info log level. """ self._checkDomain(domain) if domain in self._level: return self._level[domain] return self.NOTHING def setInfoLogLevel(self, level, domain="*"): """ Set log level [NOTHING .. INFO_MAX] """ self._checkDomain(domain) if level < self.NOTHING: level = self.NOTHING if level > self.INFO_MAX: level = self.INFO_MAX self._level[domain] = level def getDebugLogLevel(self, domain="*"): """ Get debug log level. """ self._checkDomain(domain) if domain in self._debug_level: return self._debug_level[domain] + self.NO_DEBUG return self.NO_DEBUG def setDebugLogLevel(self, level, domain="*"): """ Set debug log level [NO_DEBUG .. DEBUG_MAX] """ self._checkDomain(domain) if level < 0: level = 0 if level > self.DEBUG_MAX: level = self.DEBUG_MAX self._debug_level[domain] = level - self.NO_DEBUG def getFormat(self): return self._format def setFormat(self, _format): self._format = _format def getDateFormat(self): return self._date_format def setDateFormat(self, _format): self._date_format = _format def setInfoLogLabel(self, level, label): """ Set log label for level. Level can be a single level or an array of levels. """ levels = self._getLevels(level) for level in levels: self._checkLogLevel(level, min_level=self.FATAL, max_level=self.INFO_MAX) self._label[level] = label def setDebugLogLabel(self, level, label): """ Set log label for level. Level can be a single level or an array of levels. """ levels = self._getLevels(level, is_debug=1) for level in levels: self._checkLogLevel(level, min_level=self.INFO1, max_level=self.DEBUG_MAX) self._debug_label[level] = label def setInfoLogging(self, domain, target, level=ALL, fmt=None): """ Set info log target for domain and level. Level can be a single level or an array of levels. Use level ALL to set for all levels. If no format is specified, the default format will be used. """ self._setLogging(domain, target, level, fmt, is_debug=0) def setDebugLogging(self, domain, target, level=ALL, fmt=None): """ Set debug log target for domain and level. Level can be a single level or an array of levels. Use level ALL to set for all levels. If no format is specified, the default format will be used. """ self._setLogging(domain, target, level, fmt, is_debug=1) def addInfoLogging(self, domain, target, level=ALL, fmt=None): """ Add info log target for domain and level. Level can be a single level or an array of levels. Use level ALL to set for all levels. If no format is specified, the default format will be used. """ self._addLogging(domain, target, level, fmt, is_debug=0) def addDebugLogging(self, domain, target, level=ALL, fmt=None): """ Add debg log target for domain and level. Level can be a single level or an array of levels. Use level ALL to set for all levels. If no format is specified, the default format will be used. """ self._addLogging(domain, target, level, fmt, is_debug=1) def delInfoLogging(self, domain, target, level=ALL, fmt=None): """ Delete info log target for domain and level. Level can be a single level or an array of levels. Use level ALL to set for all levels. If no format is specified, the default format will be used. """ self._delLogging(domain, target, level, fmt, is_debug=0) def delDebugLogging(self, domain, target, level=ALL, fmt=None): """ Delete debug log target for domain and level. Level can be a single level or an array of levels. Use level ALL to set for all levels. If no format is specified, the default format will be used. """ self._delLogging(domain, target, level, fmt, is_debug=1) def isInfoLoggingHere(self, level): """ Is there currently any info logging for this log level (and domain)? """ return self._isLoggingHere(level, is_debug=0) def isDebugLoggingHere(self, level): """ Is there currently any debug logging for this log level (and domain)? """ return self._isLoggingHere(level, is_debug=1) ### log functions def fatal(self, _format, *args, **kwargs): """ Fatal error log. """ self._checkKWargs(kwargs) kwargs["is_debug"] = 0 self._log(self.FATAL, _format, *args, **kwargs) def error(self, _format, *args, **kwargs): """ Error log. """ self._checkKWargs(kwargs) kwargs["is_debug"] = 0 self._log(self.ERROR, _format, *args, **kwargs) def warning(self, _format, *args, **kwargs): """ Warning log. """ self._checkKWargs(kwargs) kwargs["is_debug"] = 0 self._log(self.WARNING, _format, *args, **kwargs) def info(self, level, _format, *args, **kwargs): """ Information log using info level [1..info_max]. There are additional infox functions according to info_max from __init__""" self._checkLogLevel(level, min_level=1, max_level=self.INFO_MAX) self._checkKWargs(kwargs) kwargs["is_debug"] = 0 self._log(level+self.NO_INFO, _format, *args, **kwargs) def debug(self, level, _format, *args, **kwargs): """ Debug log using debug level [1..debug_max]. There are additional debugx functions according to debug_max from __init__""" self._checkLogLevel(level, min_level=1, max_level=self.DEBUG_MAX) self._checkKWargs(kwargs) kwargs["is_debug"] = 1 self._log(level, _format, *args, **kwargs) def exception(self): self._log(self.TRACEBACK, traceback.format_exc(), args=[], kwargs={}) ### internal functions def _checkLogLevel(self, level, min_level, max_level): if level < min_level or level > max_level: raise ValueError("Level %d out of range, should be [%d..%d]." % \ (level, min_level, max_level)) def _checkKWargs(self, kwargs): if not kwargs: return for key in kwargs.keys(): if key not in [ "nl", "fmt", "nofmt" ]: raise ValueError("Key '%s' is not allowed as argument for logging." % key) def _checkDomain(self, domain): if not domain or domain == "": raise ValueError("Domain '%s' is not valid." % domain) def _getLevels(self, level, is_debug=0): """ Generate log level array. """ if level != self.ALL: if isinstance(level, list) or isinstance(level, tuple): levels = level else: levels = [ level ] for level in levels: if is_debug: self._checkLogLevel(level, min_level=1, max_level=self.DEBUG_MAX) else: self._checkLogLevel(level, min_level=self.FATAL, max_level=self.INFO_MAX) else: if is_debug: levels = [ i for i in range(self.DEBUG1, self.DEBUG_MAX) ] else: levels = [ i for i in range(self.FATAL, self.INFO_MAX) ] return levels def _getTargets(self, target): """ Generate target array. """ if isinstance(target, list) or isinstance(target, tuple): targets = target else: targets = [ target ] for _target in targets: if not issubclass(_target.__class__, LogTarget): raise ValueError("'%s' is no valid logging target." % \ _target.__class__.__name__) return targets def _genDomains(self, is_debug=0): # private method for self._domains array creation, speeds up """ Generate dict with domain by level. """ if is_debug: _domains = self._debug_domains _logging = self._debug_logging _range = ( 1, self.DEBUG_MAX+1 ) else: _domains = self._domains _logging = self._logging _range = ( self.FATAL, self.INFO_MAX+1 ) if len(_domains) > 0: _domains.clear() for level in range(_range[0], _range[1]): if level not in _logging: continue for (domain, dummy, dummy) in _logging[level]: if domain not in _domains: _domains.setdefault(level, [ ]).append(domain) def _setLogging(self, domain, target, level=ALL, fmt=None, is_debug=0): self._checkDomain(domain) levels = self._getLevels(level, is_debug) targets = self._getTargets(target) if is_debug: _logging = self._debug_logging else: _logging = self._logging for level in levels: for target in targets: _logging[level] = [ (domain, target, fmt) ] self._genDomains(is_debug) def _addLogging(self, domain, target, level=ALL, fmt=None, is_debug=0): self._checkDomain(domain) levels = self._getLevels(level, is_debug) targets = self._getTargets(target) if is_debug: _logging = self._debug_logging else: _logging = self._logging for level in levels: for target in targets: _logging.setdefault(level, [ ]).append((domain, target, fmt)) self._genDomains(is_debug) def _delLogging(self, domain, target, level=ALL, fmt=None, is_debug=0): self._checkDomain(domain) levels = self._getLevels(level, is_debug) targets = self._getTargets(target) if is_debug: _logging = self._debug_logging else: _logging = self._logging for _level in levels: for target in targets: if _level not in _logging: continue if (domain, target, fmt) in _logging[_level]: _logging[_level].remove( (domain, target, fmt) ) if len(_logging[_level]) == 0: del _logging[_level] continue if level != self.ALL: raise ValueError("No mathing logging for " \ "level %d, domain %s, target %s and format %s." % \ (_level, domain, target.__class__.__name__, fmt)) self._genDomains(is_debug) def _isLoggingHere(self, level, is_debug=0): _dict = self._genDict(level, is_debug) if not _dict: return False point_domain = _dict["domain"] + "." if is_debug: _logging = self._debug_logging else: _logging = self._logging # do we need to log? for (domain, dummy, dummy) in _logging[level]: if domain == "*" or \ point_domain.startswith(domain) or \ fnmatch.fnmatchcase(_dict["domain"], domain): return True return False def _getClass(self, frame): """ Function to get calling class. Returns class or None. """ # get class by first function argument, if there are any if frame.f_code.co_argcount > 0: selfname = frame.f_code.co_varnames[0] if selfname in frame.f_locals: _self = frame.f_locals[selfname] obj = self._getClass2(_self.__class__, frame.f_code) if obj: return obj module = inspect.getmodule(frame.f_code) code = frame.f_code # function in module? if code.co_name in module.__dict__: if hasattr(module.__dict__[code.co_name], "func_code") and \ module.__dict__[code.co_name].__code__ == code: return None # class in module for (dummy, obj) in module.__dict__.items(): if isinstance(obj, types.ClassType): if hasattr(obj, code.co_name): value = getattr(obj, code.co_name) if isinstance(value, types.FunctionType): if value.__code__ == code: return obj # nothing found return None def _getClass2(self, obj, code): """ Internal function to get calling class. Returns class or None. """ for value in obj.__dict__.values(): if isinstance(value, types.FunctionType): if value.__code__ == code: return obj for base in obj.__bases__: _obj = self._getClass2(base, code) if _obj: return _obj return None # internal log class def _log(self, level, _format, *args, **kwargs): is_debug = 0 if "is_debug" in kwargs: is_debug = kwargs["is_debug"] nl = 1 if "nl" in kwargs: nl = kwargs["nl"] nofmt = 0 if "nofmt" in kwargs: nofmt = kwargs["nofmt"] _dict = self._genDict(level, is_debug) if not _dict: return if len(args) > 1: _dict['message'] = _format % args elif len(args) == 1: # needed for _format % _dict _dict['message'] = _format % args[0] else: _dict['message'] = _format point_domain = _dict["domain"] + "." if is_debug: _logging = self._debug_logging else: _logging = self._logging used_targets = [ ] # log to target(s) for (domain, target, _format) in _logging[level]: if target in used_targets: continue if domain == "*" \ or point_domain.startswith(domain+".") \ or fnmatch.fnmatchcase(_dict["domain"], domain): if not _format: _format = self._format if "fmt" in kwargs: _format = kwargs["fmt"] if nofmt: target.write(_dict["message"], level, self, is_debug) else: target.write(_format % _dict, level, self, is_debug) if nl: # newline target.write("\n", level, self, is_debug) used_targets.append(target) # internal function to generate the dict, needed for logging def _genDict(self, level, is_debug=0): """ Internal function. """ check_domains = [ ] simple_match = False if is_debug: _dict = self._debug_level _domains = self._debug_domains _label = self._debug_label else: _dict = self._level _domains = self._domains _label = self._label # no debug for domain in _dict: if domain == "*": # '*' matches everything: simple match if _dict[domain] >= level: simple_match = True if len(check_domains) > 0: check_domains = [ ] break else: if _dict[domain] >= level: check_domains.append(domain) if not simple_match and len(check_domains) < 1: return None if level not in _domains: return None f = inspect.currentframe() # go outside of logger module as long as there is a lower frame while f and f.f_back and f.f_globals["__name__"] == self.__module__: f = f.f_back if not f: raise ValueError("Frame information not available.") # get module name module_name = f.f_globals["__name__"] # simple module match test for all entries of check_domain point_module = module_name + "." for domain in check_domains: if point_module.startswith(domain): # found domain in module name check_domains = [ ] break # get code co = f.f_code # optimization: bail out early if domain can not match at all _len = len(module_name) for domain in _domains[level]: i = domain.find("*") if i == 0: continue elif i > 0: d = domain[:i] else: d = domain if _len >= len(d): if not module_name.startswith(d): return None else: if not d.startswith(module_name): return None # generate _dict for format output level_str = "" if level in _label: level_str = _label[level] _dict = { 'file': co.co_filename, 'line': f.f_lineno, 'module': module_name, 'class': '', 'function': co.co_name, 'domain': '', 'label' : level_str, 'level' : level, 'date' : time.strftime(self._date_format, time.localtime()) } if _dict["function"] == "?": _dict["function"] = "" # domain match needed? domain_needed = False for domain in _domains[level]: # standard domain, matches everything if domain == "*": continue # domain is needed domain_needed = True break # do we need to get the class object? if self._format.find("%(domain)") >= 0 or \ self._format.find("%(class)") >= 0 or \ domain_needed or \ len(check_domains) > 0: obj = self._getClass(f) if obj: _dict["class"] = obj.__name__ # build domain string _dict["domain"] = "" + _dict["module"] if _dict["class"] != "": _dict["domain"] += "." + _dict["class"] if _dict["function"] != "": _dict["domain"] += "." + _dict["function"] if len(check_domains) < 1: return _dict point_domain = _dict["domain"] + "." for domain in check_domains: if point_domain.startswith(domain) or \ fnmatch.fnmatchcase(_dict["domain"], domain): return _dict return None # --------------------------------------------------------------------------- # Global logging object. log = Logger() # --------------------------------------------------------------------------- """ # Example if __name__ == '__main__': log.setInfoLogLevel(log.INFO2) log.setDebugLogLevel(log.DEBUG5) for i in range(log.INFO1, log.INFO_MAX+1): log.setInfoLogLabel(i, "INFO%d: " % i) for i in range(log.DEBUG1, log.DEBUG_MAX+1): log.setDebugLogLabel(i, "DEBUG%d: " % i) log.setFormat("%(date)s %(module)s:%(line)d %(label)s" "%(message)s") log.setDateFormat("%Y-%m-%d %H:%M:%S") fl = FileLog("/tmp/log", "a") log.addInfoLogging("*", fl) log.delDebugLogging("*", log.stdout) log.setDebugLogging("*", log.stdout, [ log.DEBUG1, log.DEBUG2 ] ) log.addDebugLogging("*", fl) # log.addInfoLogging("*", log.syslog, fmt="%(label)s%(message)s") # log.addDebugLogging("*", log.syslog, fmt="%(label)s%(message)s") log.debug10("debug10") log.debug9("debug9") log.debug8("debug8") log.debug7("debug7") log.debug6("debug6") log.debug5("debug5") log.debug4("debug4") log.debug3("debug3") log.debug2("debug2", fmt="%(file)s:%(line)d %(message)s") log.debug1("debug1", nofmt=1) log.info5("info5") log.info4("info4") log.info3("info3") log.info2("info2") log.info1("info1") log.warning("warning\n", nl=0) log.error("error ", nl=0) log.error("error", nofmt=1) log.fatal("fatal") log.info(log.INFO1, "nofmt info", nofmt=1) log.info(log.INFO2, "info2 fmt", fmt="%(file)s:%(line)d %(message)s") try: a = b except Exception as e: log.exception() """ # vim:ts=4:sw=4:showmatch:expandtab