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from sys import exc_info
from traceback import format_exception
from logging import ERROR, getLogger
from ptrace.logging_tools import getLogFunc, changeLogLevel
PTRACE_ERRORS = Exception
def writeBacktrace(logger, log_level=ERROR):
"""
Write a backtrace into the logger with the specified log level.
"""
log_func = getLogFunc(logger, log_level)
try:
info = exc_info()
trace = format_exception(*info)
if trace[0] != "None\n":
trace = ''.join(trace).rstrip()
for line in trace.split("\n"):
log_func(line.rstrip())
return
except Exception:
pass
log_func("Unable to get backtrace")
def formatError(error):
"""
Format an error as a string. Write the error type as prefix.
Eg. "[ValueError] invalid value".
"""
return "[%s] %s" % (error.__class__.__name__, error)
def writeError(logger, error, title="ERROR", log_level=ERROR):
"""
Write an error into the logger:
- logger: the logger (if None, use getLogger())
- error: the exception object
- title: error message prefix (e.g. title="Initialization error")
- log_level: log level of the error
If the exception is a SystemExit or a KeyboardInterrupt, re-emit
(raise) the exception and don't write it.
"""
if not logger:
logger = getLogger()
if error.__class__ in (SystemExit, KeyboardInterrupt):
raise error
log_func = getLogFunc(logger, log_level)
log_func("%s: %s" % (title, formatError(error)))
writeBacktrace(logger, log_level=changeLogLevel(log_level, -1))
class PtraceError(Exception):
"""
Ptrace error: have the optional attributes errno and pid.
"""
def __init__(self, message, errno=None, pid=None):
Exception.__init__(self, message)
self.errno = errno
self.pid = pid
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