VirtualMailManager/common.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 28 Jul 2010 01:03:56 +0000
branchv0.6.x
changeset 319 f4956b4ceba1
parent 316 31d8931dc535
child 320 011066435e6f
permissions -rw-r--r--
VMM//{,cli/}Handler: PEP-8-ified the Handler classes: * converted CamelCase method names to lower_case_with_underscores * eliminated __names * added missing docstrings
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.common
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    Some common functions
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"""
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import os
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import re
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from VirtualMailManager import ENCODING
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from VirtualMailManager.constants import \
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     NOT_EXECUTABLE, NO_SUCH_BINARY, NO_SUCH_DIRECTORY
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from VirtualMailManager.errors import VMMError
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_version_re = re.compile(r'^(\d+)\.(\d+)\.(?:(\d+)|(alpha|beta|rc)(\d+))$')
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_version_level = dict(alpha=0xA, beta=0xB, rc=0xC)
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_version_cache = {}
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_ = lambda msg: msg
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def expand_path(path):
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    """Expands paths, starting with ``.`` or ``~``, to an absolute path."""
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    if path.startswith('.'):
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        return os.path.abspath(path)
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    if path.startswith('~'):
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        return os.path.expanduser(path)
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    return path
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def get_unicode(string):
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    """Converts `string` to `unicode`, if necessary."""
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    if isinstance(string, unicode):
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        return string
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    return unicode(string, ENCODING, 'replace')
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def is_dir(path):
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    """Checks if `path` is a directory.
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    Throws a `VMMError` if `path` is not a directory.
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    """
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    path = expand_path(path)
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    if not os.path.isdir(path):
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        raise VMMError(_(u"'%s' is not a directory") % get_unicode(path),
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                       NO_SUCH_DIRECTORY)
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    return path
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def exec_ok(binary):
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    """Checks if the `binary` exists and if it is executable.
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    Throws a `VMMError` if the `binary` isn't a file or is not
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    executable.
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    """
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    binary = expand_path(binary)
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    if not os.path.isfile(binary):
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        raise VMMError(_(u"'%s' is not a file") % get_unicode(binary),
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                       NO_SUCH_BINARY)
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    if not os.access(binary, os.X_OK):
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        raise VMMError(_(u"File is not executable: '%s'") %
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                       get_unicode(binary), NOT_EXECUTABLE)
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    return binary
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def version_hex(version_string):
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    """Converts a Dovecot version, e.g.: '1.2.3' or '2.0.beta4', to an int.
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    Raises a `ValueError` if the *version_string* has the wrongâ„¢ format.
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    version_hex('1.2.3') -> 270548736
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    hex(version_hex('1.2.3')) -> '0x10203f00'
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    """
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    global _version_cache, _version_level, _version_re
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    if version_string in _version_cache:
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        return _version_cache[version_string]
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    version = 0
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    version_mo = _version_re.match(version_string)
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    if not version_mo:
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        raise ValueError('Invalid version string: %r' % version_string)
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    major, minor, patch, level, serial = version_mo.groups()
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    major = int(major)
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    minor = int(minor)
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    if patch:
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        patch = int(patch)
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    if serial:
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        serial = int(serial)
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    if major > 0xFF or minor > 0xFF or \
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      patch and patch > 0xFF or serial and serial > 0xFF:
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        raise ValueError('Invalid version string: %r' % version_string)
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    version += major << 28
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    version += minor << 20
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    if patch:
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        version += patch << 12
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    version += _version_level.get(level, 0xF) << 8
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    if serial:
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        version += serial
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    _version_cache[version_string] = version
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    return version
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def version_str(version):
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    """Converts a Dovecot version previously converted with version_hex back to
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    a string.
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    Raises a `TypeError` if *version* is not an int/long.
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    Raises a `ValueError` if *version* is an incorrect int version.
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    """
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    global _version_cache, _version_level
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    if version in _version_cache:
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        return _version_cache[version]
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    if not isinstance(version, (int, long)):
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        raise TypeError('Argument is not a int/long: %r', version)
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    major = (version >> 28) & 0xFF
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    minor = (version >> 20) & 0xFF
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    patch = (version >> 12) & 0xFF
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    level = (version >> 8) & 0x0F
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    serial = version & 0xFF
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    levels = dict(zip(_version_level.values(), _version_level.keys()))
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    if level == 0xF and not serial:
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        version_string = '%u.%u.%u' % (major, minor, patch)
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    elif level in levels and not patch:
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        version_string = '%u.%u.%s%u' % (major, minor, levels[level], serial)
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    else:
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        raise ValueError('Invalid version: %r' % hex(version))
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    _version_cache[version] = version_string
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    return version_string
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   136
del _