Python: logging module - globally?

Use logging. GetLogger(name) to create a named global logger. ( docs.python.org/py3k/library/logging.htm... ) main.Py import log logger = log.

Setup_custom_logger('root') logger. Debug('main message') import submodule log.Py import logging def setup_custom_logger(name): formatter = logging. Formatter(fmt='%(asctime)s - %(levelname)s - %(module)s - %(message)s') handler = logging.StreamHandler() handler.

SetFormatter(formatter) logger = logging. GetLogger(name) logger. SetLevel(logging.

DEBUG) logger. AddHandler(handler) return logger submodule. Py import logging logger = logging.

GetLogger('root') logger. Debug('submodule message') Output 2011-10-01 20:08:40,049 - DEBUG - main - main message 2011-10-01 20:08:40,050 - DEBUG - submodule - submodule message.

Create an instance of customLogger in your log module and use it as a singleton - just use the imported instance, rather than the class.

You can just pass it a string with a common sub-string before the first period. The parts of the string separated by the period (". ") can be used for different classes / modules / files / etc.Like so (specifically the logger = logging.

GetLogger(loggerName) part): def getLogger(name, logdir=LOGDIR_DEFAULT, level=logging. DEBUG, logformat=FORMAT): base = os.path. Basename(__file__) loggerName = "%s.

%s" % (base, name) logFileName = os.path. Join(logdir, "%s. Log" % loggerName) logger = logging.

GetLogger(loggerName) logger. SetLevel(level) I = 0 while os.path. Exists(logFileName) and not os.

Access(logFileName, os. R_OK | os. W_OK): I += 1 logFileName = "%s.

%s. Log" % (logFileName. Replace(".

Log", ""), str(i). Zfill((len(str(i)) + 1))) try: #fh = logging. FileHandler(logFileName) fh = RotatingFileHandler(filename=logFileName, mode="a", maxBytes=1310720, backupCount=50) except IOError, exc: errOut = "Unable to create/open log file \"%s\".

" % logFileName if exc. Errno is 13: # Permission denied exception errOut = "ERROR ** Permission Denied ** - %s" % errOut elif exc. Errno is 2: # No such directory errOut = "ERROR ** No such directory \"%s\"** - %s" % (os.path.

Split(logFileName)0, errOut) elif exc. Errno is 24: # Too many open files errOut = "ERROR ** Too many open files ** - Check open file descriptors in /proc//fd/ (PID: %s)" % os.getpid() else: errOut = "Unhandled Exception ** %s ** - %s" % (str(exc), errOut) raise LogException(errOut) else: formatter = logging. Formatter(logformat) fh.

SetLevel(level) fh. SetFormatter(formatter) logger. AddHandler(fh) return logger class MainThread: def __init__(self, cfgdefaults, configdir, pidfile, logdir, test=False): self.

Logdir = logdir logLevel = logging. DEBUG logPrefix = "MainThread_TEST" if self. Test else "MainThread" try: self.

Logger = getLogger(logPrefix, self. Logdir, logLevel, FORMAT) except LogException, exc: sys.stderr. Write("%s\n" % exc) sys.stderr.flush() os.

_exit(0) else: self.logger. Debug("-------------------- MainThread created. Starting __init__() --------------------") def run(self): self.logger.

Debug("Initializing ReportThreads..") for (group, cfg) in self.config.items(): self.logger. Debug(" ------------------------------ GROUP '%s' CONFIG ------------------------------ " % group) for k2, v2 in cfg.items(): self.logger. Debug("%s %s: %s" % (group, k2, v2)) try: rt = ReportThread(self, group, cfg, self.

Logdir, self. Test) except LogException, exc: sys.stderr. Write("%s\n" % exc) sys.stderr.flush() self.logger.

Exception("Exception when creating ReportThread (%s)" % group) logging.shutdown() os. _exit(1) else: self.threads. Append(rt) self.logger.

Debug("Threads initialized.. \"%s\"" % ", ". Join(t.Name for t in self. Threads)) for t in self.

Threads: t.Start() if not self. Test: self.loop() class ReportThread: def __init__(self, mainThread, name, config, logdir, test): self. MainThread = mainThread self.

Name = name logLevel = logging. DEBUG self. Logger = getLogger("MainThread%s.

ReportThread_%s" % ("_TEST" if self. Test else "", self. Name), logdir, logLevel, FORMAT) self.logger.

Info("init database...") self.initDB() # etc.... if __name__ == "__main__": # ..... MainThread(cfgdefaults=options. Cfgdefaults, configdir=options. Configdir, pidfile=options.

Pidfile, logdir=options. Logdir, test=options. Test).

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