VirtualMailManager/common.py
author martin f. krafft <madduck@madduck.net>
Mon, 09 Apr 2012 18:10:56 +0200
branchv0.6.x
changeset 504 f180ead60568
parent 414 ae1a8428298c
child 527 e09139525580
permissions -rw-r--r--
First version of a CatchallAlias class I based the CatchallAlias class in catchall.py heavily on the Alias class, but by copy, not deriving. The two are functionally related, but the implementations are too different because CatchallAliases have no localpart.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010 - 2011, 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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    ~~~~~~~~~~~~~~~~~~~~~~~~~
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    Some common functions
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"""
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import locale
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import os
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import re
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import stat
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from VirtualMailManager import ENCODING
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from VirtualMailManager.constants import NOT_EXECUTABLE, NO_SUCH_BINARY
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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 lisdir(path):
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    """Checks if `path` is a directory.  Doesn't follow symbolic links.
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    Returns bool.
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    """
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    try:
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        lstat = os.lstat(path)
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    except OSError:
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        return False
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    return stat.S_ISDIR(lstat.st_mode)
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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"No such file: '%s'") % 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 human_size(size):
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    """Converts the `size` in bytes in human readable format."""
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    if not isinstance(size, (long, int)):
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        try:
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            size = long(size)
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        except ValueError:
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            raise TypeError("'size' must be a positive long or int.")
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    if size < 0:
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        raise ValueError("'size' must be a positive long or int.")
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    if size < 1024:
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        return str(size)
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    prefix_multiply = ((_(u'TiB'), 1 << 40), (_(u'GiB'), 1 << 30),
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                       (_(u'MiB'), 1 << 20), (_(u'KiB'), 1 << 10))
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    for prefix, multiply in prefix_multiply:
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        if size >= multiply:
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            # TP: e.g.: '%(size)s %(prefix)s' -> '118.30 MiB'
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            return _(u'%(size)s %(prefix)s') % {
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                    'size': locale.format('%.2f', float(size) / multiply,
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                                          True),
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                    'prefix': prefix}
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def size_in_bytes(size):
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    """Converts the string `size` to a long (size in bytes).
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    The string `size` can be suffixed with *b* (bytes), *k* (kilobytes),
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    *M* (megabytes) or *G* (gigabytes).
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    """
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    if not isinstance(size, basestring) or not size:
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        raise TypeError('size must be a non empty string.')
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    if size[-1].upper() in ('B', 'K', 'M', 'G'):
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        try:
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            num = int(size[:-1])
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        except ValueError:
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            raise ValueError('Not a valid integer value: %r' % size[:-1])
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        unit = size[-1].upper()
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        if unit == 'B':
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            return num
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        elif unit == 'K':
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            return num << 10L
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        elif unit == 'M':
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            return num << 20L
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        else:
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            return num << 30L
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    else:
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        try:
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            num = int(size)
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        except ValueError:
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            raise ValueError('Not a valid size value: %r' % size)
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        return num
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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
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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
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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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del _