handle_error.py

在 linux平台上的网页编程的模板

import traceback, sys, string, time, socket, os
import who_calls

#DUMP_DIR = "/neo/data/bugs"
DUMP_DIR = "/tmp/bugs"

Warning = "handle_error.Warning"

# levels
LV_MESSAGE = "LV_MESSAGE"
LV_WARNING = "LV_WARNING"
LV_ERROR   = "LV_ERROR"

Count = 0

gErrorCount = 0
DISABLE_DUMP = 0

def exceptionReason():
  return "%s.%s" % (str(sys.exc_type), str(sys.exc_value))

def exceptionString():
  tb_list = traceback.format_exception(sys.exc_type,sys.exc_value,sys.exc_traceback)
  return string.join(tb_list,"")

  #### old way
  import StringIO
  ## get the traceback message  
  sfp = StringIO.StringIO()
  traceback.print_exc(file=sfp)
  exception = sfp.getvalue()
  sfp.close()

  return exception


def handleException (msg=None, lvl=LV_ERROR, dump = 1):
  global gErrorCount
  gErrorCount = gErrorCount + 1

  tb_list = traceback.format_exception(sys.exc_type,sys.exc_value,sys.exc_traceback)
  if msg:
    sys.stderr.write ("%s\n" % msg)
  else:
    msg = "Unhandled Exception"
        
  sys.stderr.write (string.join(tb_list,""))
  try:
    if dump: dump_bug(lvl, "handleException", msg, string.join(tb_list, ""))
  except:
    handleException("Unable to dump_bug", dump = 0)

def handleWarning (msg=""):
  header = "*** handleWarning: %s\n" % msg
  sys.stderr.write(header)
  tb = who_calls.pretty_who_calls(strip=1) + "\n"
  sys.stderr.write(tb)

  try:
    dump_bug(LV_WARNING, "handleException", msg, tb)
  except:
    handleException("Unable to dump_bug", dump = 0)

def checkPaths():
  paths = (DUMP_DIR, 
           os.path.join (DUMP_DIR, "tmp"),
           os.path.join (DUMP_DIR, "new"))
  for path in paths:
    if not os.path.isdir(path):
      os.mkdir(path, 0755)


def dump_bug (level, etype, msg, location=None, nhdf=None):
    global DISABLE_DUMP
    if DISABLE_DUMP: return

    now = int(time.time())
    pid = os.getpid()

    import neo_cgi, neo_util
    hdf = neo_util.HDF()
    hdf.setValue("Required.Level", level)
    hdf.setValue("Required.When", str(int(time.time())))
    hdf.setValue("Required.Type", etype)
    hdf.setValue("Required.Title", msg)
    hdf.setValue("Optional.Hostname", socket.gethostname())
    if location:
        hdf.setValue("Optional.Location", location)

    for (key, value) in os.environ.items():
        hdf.setValue ("Environ.%s" % key, value)

    global Count
    Count = Count + 1
    fname = "%d.%d_%d.%s" % (now, pid, Count, socket.gethostname())
    checkPaths()

    tpath = os.path.join (DUMP_DIR, "tmp", fname)
    npath = os.path.join (DUMP_DIR, "new", fname)
    hdf.writeFile(tpath)
    os.rename(tpath, npath)