Edit File: logs.py
import atexit import logging import logging.handlers import os import os.path import inspect import tuned.consts as consts import random import string import threading try: from StringIO import StringIO except: from io import StringIO __all__ = ["get"] root_logger = None log_handlers = {} log_handlers_lock = threading.Lock() class LogHandler(object): def __init__(self, handler, stream): self.handler = handler self.stream = stream def _random_string(length): r = random.SystemRandom() chars = string.ascii_letters + string.digits res = "" for i in range(length): res += r.choice(chars) return res def log_capture_start(log_level): with log_handlers_lock: for i in range(10): token = _random_string(16) if token not in log_handlers: break else: return None stream = StringIO() handler = logging.StreamHandler(stream) handler.setLevel(log_level) formatter = logging.Formatter( "%(levelname)-8s %(name)s: %(message)s") handler.setFormatter(formatter) root_logger.addHandler(handler) log_handler = LogHandler(handler, stream) log_handlers[token] = log_handler root_logger.debug("Added log handler %s." % token) return token def log_capture_finish(token): with log_handlers_lock: try: log_handler = log_handlers[token] except KeyError: return None content = log_handler.stream.getvalue() log_handler.stream.close() root_logger.removeHandler(log_handler.handler) del log_handlers[token] root_logger.debug("Removed log handler %s." % token) return content def get(): global root_logger if root_logger is None: root_logger = logging.getLogger("tuned") calling_module = inspect.currentframe().f_back name = calling_module.f_locals["__name__"] if name == "__main__": name = "tuned" return root_logger elif name.startswith("tuned."): (root, child) = name.split(".", 1) child_logger = root_logger.getChild(child) child_logger.remove_all_handlers() child_logger.setLevel("NOTSET") return child_logger else: assert False class TunedLogger(logging.getLoggerClass()): """Custom TuneD daemon logger class.""" _formatter = logging.Formatter("%(asctime)s %(levelname)-8s %(name)s: %(message)s") _console_handler = None _file_handler = None def __init__(self, *args, **kwargs): super(TunedLogger, self).__init__(*args, **kwargs) self.setLevel(logging.INFO) self.switch_to_console() def console(self, msg, *args, **kwargs): self.log(consts.LOG_LEVEL_CONSOLE, msg, *args, **kwargs) def switch_to_console(self): self._setup_console_handler() self.remove_all_handlers() self.addHandler(self._console_handler) def switch_to_file(self, filename = consts.LOG_FILE, maxBytes = consts.LOG_FILE_MAXBYTES, backupCount = consts.LOG_FILE_COUNT): self._setup_file_handler(filename, maxBytes, backupCount) self.remove_all_handlers() self.addHandler(self._file_handler) def remove_all_handlers(self): _handlers = self.handlers for handler in _handlers: self.removeHandler(handler) @classmethod def _setup_console_handler(cls): if cls._console_handler is not None: return cls._console_handler = logging.StreamHandler() cls._console_handler.setFormatter(cls._formatter) @classmethod def _setup_file_handler(cls, filename, maxBytes, backupCount): if cls._file_handler is not None: return log_directory = os.path.dirname(filename) if log_directory == '': log_directory = '.' if not os.path.exists(log_directory): os.makedirs(log_directory) cls._file_handler = logging.handlers.RotatingFileHandler( filename, maxBytes = int(maxBytes), backupCount = int(backupCount)) cls._file_handler.setFormatter(cls._formatter) logging.addLevelName(consts.LOG_LEVEL_CONSOLE, consts.LOG_LEVEL_CONSOLE_NAME) logging.setLoggerClass(TunedLogger) atexit.register(logging.shutdown)
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