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:
#        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 objet
#     - title: error message prefix (eg. 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

