import time
import traceback
import sys

timeformat = "%Y-%m-%d %H:%M:%S %Z"

pri_low = 1
pri_normal = 2
pri_high = 3

def log(msg, priority = pri_normal):
    print "[%s] %s" % (time.strftime(timeformat), msg)
    sys.stdout.flush()

def logexception(msg, priority = pri_normal, args = None, kwargs = None):
    log(msg + "\n" +
        "args = %s\n" % repr(args) +
        "kwargs = %s\n" % repr(kwargs) +
        traceback.format_exc(), priority)

class FunctionLogger:
    def __init__(function, msg = None, priority = pri_normal):
        self.function = function
        if msg is not None:
            self.msg = msg
        else:
            self.msg = "Exception in %s:" % function.__name__
        self.priority = priority
    
    def __call__(*args, **kwargs):
        try:
            self.function(*args, **kwargs)
        except KeyboardInterrupt:
            raise
        except:
            logexception(self.msg, self.priority, args, kwargs)