Synnefo » ./kamaki

# Copyright 2011 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from kamaki.cli.logger import get_logger

log = get_logger('kamaki.cli')

class CLIError(Exception):

    def __init__(self, message, details=[], importance=0):

        """

        @message is the main message of the Error

        @detauls is a list of previous errors

        @importance of the output for the user

            Suggested values: 0, 1, 2, 3

        """

        message += '' if message and message[-1] == '\n' else '\n'

        super(CLIError, self).__init__(message)

        self.details = list(details) if isinstance(details, list)\

            else [] if details is None else ['%s' % details]

        try:

            self.importance = int(importance)

        except ValueError:

            self.importance = 0

class CLISyntaxError(CLIError):

    def __init__(self, message='Syntax Error', details=[], importance=1):

        super(CLISyntaxError, self).__init__(message, details, importance)

class CLIUnknownCommand(CLIError):

    def __init__(self, message='Unknown Command', details=[], importance=1):

        super(CLIUnknownCommand, self).__init__(message, details, importance)

class CLICmdSpecError(CLIError):

    def __init__(

            self, message='Command Specification Error',

            details=[], importance=0):

        super(CLICmdSpecError, self).__init__(message, details, importance)

class CLICmdIncompleteError(CLICmdSpecError):

    def __init__(

            self, message='Incomplete Command Error',

            details=[], importance=1):

        super(CLICmdSpecError, self).__init__(message, details, importance)

def raiseCLIError(err, message='', importance=0, details=[]):

    """

    :param err: (Exception) the original error message, if None, a new

        CLIError is born which is conceptually bind to raiser

    :param message: (str) a custom error message that overrides err's

    :param importance: (int) instruction to called application (e.g. for

        coloring printed error messages)

    :param details: (list) various information on the error

    :raises CLIError: it is the purpose of this method

    """

    from traceback import format_stack

    stack = ['%s' % type(err)] if err else ['<kamaki.cli.errors.CLIError>']

    stack += format_stack()

    try:

        stack = [e for e in stack if e != stack[1]]

    except KeyError:

        log.debug('\n   < '.join(stack))

    details = ['%s' % details] if not isinstance(details, list)\

        else list(details)

    details += getattr(err, 'details', [])

    if err:

        origerr = '%s' % err

        origerr = origerr if origerr else '%s' % type(err)

    else:

        origerr = stack[0]

    message = '%s' % (message if message else origerr)

    try:

        status = err.status or err.errno

    except AttributeError:

        status = None

    if origerr not in details + [message]:

        details.append(origerr)

    message += '' if message and message[-1] == '\n' else '\n'

    if status:

        message = '(%s) %s' % (err.status, message)

        try:

            status = int(err.status)

        except ValueError:

            raise CLIError(message, details, importance)

        importance = importance if importance else status // 100

    importance = getattr(err, 'importance', importance)

    raise CLIError(message, details, importance)