PLC/Debug.py

   1 # log system for PLCAPI
   2 import time
   3 import sys
   4 import syslog
   5
   6 class unbuffered:
   7     """
   8     Write to /var/log/httpd/error_log. See
   9
  10     http://www.modpython.org/FAQ/faqw.py?req=edit&file=faq02.003.htp
  11     """
  12
  13     def write(self, data):
  14         sys.stderr.write(data)
  15         sys.stderr.flush()
  16
  17 log = unbuffered()
  18
  19 def profile(callable):
  20     """
  21     Prints the runtime of the specified callable. Use as a decorator, e.g.,
  22
  23         @profile
  24         def foo(...):
  25             ...
  26
  27     Or, equivalently,
  28
  29         def foo(...):
  30             ...
  31         foo = profile(foo)
  32
  33     Or inline:
  34
  35         result = profile(foo)(...)
  36     """
  37
  38     def wrapper(*args, **kwds):
  39         start = time.time()
  40         result = callable(*args, **kwds)
  41         end = time.time()
  42         params = map(str, args)
  43         params += ["{} = {}".format(name, value) for (name, value) in kwds.items()]
  44         params = ", ".join(params)
  45         print >> log, "{} ({}) {:f}s -> {}".format(callable.__name__, params, end - start, result)
  46         return result
  47
  48     return wrapper
  49
  50 if __name__ == "__main__":
  51     def sleep(seconds = 1):
  52         time.sleep(seconds)
  53
  54     sleep = profile(sleep)
  55
  56     sleep(1)