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Edit File : __init__.py \| Size : 6.59 KB
# -- coding: utf-8 -- import warnings import json from tarfile import TarFile from pkgutil import get_data from io import BytesIO from contextlib import closing from dateutil.tz import tzfile __all__ = ["get_zonefile_instance", "gettz", "gettz_db_metadata", "rebuild"] ZONEFILENAME = "dateutil-zoneinfo.tar.gz" METADATA_FN = 'METADATA' # python2.6 compatability. Note that TarFile.__exit__ != TarFile.close, but # it's close enough for python2.6 tar_open = TarFile.open if not hasattr(TarFile, '__exit__'): def tar_open(args, kwargs): return closing(TarFile.open(args, *kwargs)) class tzfile(tzfile): def __reduce__(self): return (gettz, (self._filename,)) def getzoneinfofile_stream(): try: return BytesIO(get_data(__name__, ZONEFILENAME)) except IOError as e: # TODO switch to FileNotFoundError? warnings.warn("I/O error({0}): {1}".format(e.errno, e.strerror)) return None class ZoneInfoFile(object): def __init__(self, zonefile_stream=None): if zonefile_stream is not None: with tar_open(fileobj=zonefile_stream, mode='r') as tf: # dict comprehension does not work on python2.6 # TODO: get back to the nicer syntax when we ditch python2.6 # self.zones = {zf.name: tzfile(tf.extractfile(zf), # filename = zf.name) # for zf in tf.getmembers() if zf.isfile()} self.zones = dict((zf.name, tzfile(tf.extractfile(zf), filename=zf.name)) for zf in tf.getmembers() if zf.isfile() and zf.name != METADATA_FN) # deal with links: They'll point to their parent object. Less # waste of memory # links = {zl.name: self.zones[zl.linkname] # for zl in tf.getmembers() if zl.islnk() or zl.issym()} links = dict((zl.name, self.zones[zl.linkname]) for zl in tf.getmembers() if zl.islnk() or zl.issym()) self.zones.update(links) try: metadata_json = tf.extractfile(tf.getmember(METADATA_FN)) metadata_str = metadata_json.read().decode('UTF-8') self.metadata = json.loads(metadata_str) except KeyError: # no metadata in tar file self.metadata = None else: self.zones = dict() self.metadata = None def get(self, name, default=None): """ Wrapper for :func:`ZoneInfoFile.zones.get`. This is a convenience method for retrieving zones from the zone dictionary. :param name: The name of the zone to retrieve. (Generally IANA zone names) :param default: The value to return in the event of a missing key. .. versionadded:: 2.6.0 """ return self.zones.get(name, default) # The current API has gettz as a module function, although in fact it taps into # a stateful class. So as a workaround for now, without changing the API, we # will create a new "global" class instance the first time a user requests a # timezone. Ugly, but adheres to the api. # # TODO: Remove after deprecation period. _CLASS_ZONE_INSTANCE = list() def get_zonefile_instance(new_instance=False): """ This is a convenience function which provides a :class:`ZoneInfoFile` instance using the data provided by the ``dateutil`` package. By default, it caches a single instance of the ZoneInfoFile object and returns that. :param new_instance: If ``True``, a new instance of :class:`ZoneInfoFile` is instantiated and used as the cached instance for the next call. Otherwise, new instances are created only as necessary. :return: Returns a :class:`ZoneInfoFile` object. .. versionadded:: 2.6 """ if new_instance: zif = None else: zif = getattr(get_zonefile_instance, '_cached_instance', None) if zif is None: zif = ZoneInfoFile(getzoneinfofile_stream()) get_zonefile_instance._cached_instance = zif return zif def gettz(name): """ This retrieves a time zone from the local zoneinfo tarball that is packaged with dateutil. :param name: An IANA-style time zone name, as found in the zoneinfo file. :return: Returns a :class:`dateutil.tz.tzfile` time zone object. .. warning:: It is generally inadvisable to use this function, and it is only provided for API compatibility with earlier versions. This is not* equivalent to ``dateutil.tz.gettz()``, which selects an appropriate time zone based on the inputs, favoring system zoneinfo. This is ONLY for accessing the dateutil-specific zoneinfo (which may be out of date compared to the system zoneinfo). .. deprecated:: 2.6 If you need to use a specific zoneinfofile over the system zoneinfo, instantiate a :class:`dateutil.zoneinfo.ZoneInfoFile` object and call :func:`dateutil.zoneinfo.ZoneInfoFile.get(name)` instead. Use :func:`get_zonefile_instance` to retrieve an instance of the dateutil-provided zoneinfo. """ warnings.warn("zoneinfo.gettz() will be removed in future versions, " "to use the dateutil-provided zoneinfo files, instantiate a " "ZoneInfoFile object and use ZoneInfoFile.zones.get() " "instead. See the documentation for details.", DeprecationWarning) if len(_CLASS_ZONE_INSTANCE) == 0: _CLASS_ZONE_INSTANCE.append(ZoneInfoFile(getzoneinfofile_stream())) return _CLASS_ZONE_INSTANCE[0].zones.get(name) def gettz_db_metadata(): """ Get the zonefile metadata See `zonefile_metadata`_ :returns: A dictionary with the database metadata .. deprecated:: 2.6 See deprecation warning in :func:`zoneinfo.gettz`. To get metadata, query the attribute ``zoneinfo.ZoneInfoFile.metadata``. """ warnings.warn("zoneinfo.gettz_db_metadata() will be removed in future " "versions, to use the dateutil-provided zoneinfo files, " "ZoneInfoFile object and query the 'metadata' attribute " "instead. See the documentation for details.", DeprecationWarning) if len(_CLASS_ZONE_INSTANCE) == 0: _CLASS_ZONE_INSTANCE.append(ZoneInfoFile(getzoneinfofile_stream())) return _CLASS_ZONE_INSTANCE[0].metadata Back

Edit File : __init__.py | Size : 6.59 KB

# -*- coding: utf-8 -*-
import warnings
import json

from tarfile import TarFile
from pkgutil import get_data
from io import BytesIO
from contextlib import closing

from dateutil.tz import tzfile

__all__ = ["get_zonefile_instance", "gettz", "gettz_db_metadata", "rebuild"]

ZONEFILENAME = "dateutil-zoneinfo.tar.gz"
METADATA_FN = 'METADATA'

# python2.6 compatability. Note that TarFile.__exit__ != TarFile.close, but
# it's close enough for python2.6
tar_open = TarFile.open
if not hasattr(TarFile, '__exit__'):
    def tar_open(*args, **kwargs):
        return closing(TarFile.open(*args, **kwargs))

class tzfile(tzfile):
    def __reduce__(self):
        return (gettz, (self._filename,))

def getzoneinfofile_stream():
    try:
        return BytesIO(get_data(__name__, ZONEFILENAME))
    except IOError as e:  # TODO  switch to FileNotFoundError?
        warnings.warn("I/O error({0}): {1}".format(e.errno, e.strerror))
        return None

class ZoneInfoFile(object):
    def __init__(self, zonefile_stream=None):
        if zonefile_stream is not None:
            with tar_open(fileobj=zonefile_stream, mode='r') as tf:
                # dict comprehension does not work on python2.6
                # TODO: get back to the nicer syntax when we ditch python2.6
                # self.zones = {zf.name: tzfile(tf.extractfile(zf),
                #               filename = zf.name)
                #              for zf in tf.getmembers() if zf.isfile()}
                self.zones = dict((zf.name, tzfile(tf.extractfile(zf),
                                                   filename=zf.name))
                                  for zf in tf.getmembers()
                                  if zf.isfile() and zf.name != METADATA_FN)
                # deal with links: They'll point to their parent object. Less
                # waste of memory
                # links = {zl.name: self.zones[zl.linkname]
                #        for zl in tf.getmembers() if zl.islnk() or zl.issym()}
                links = dict((zl.name, self.zones[zl.linkname])
                             for zl in tf.getmembers() if
                             zl.islnk() or zl.issym())
                self.zones.update(links)
                try:
                    metadata_json = tf.extractfile(tf.getmember(METADATA_FN))
                    metadata_str = metadata_json.read().decode('UTF-8')
                    self.metadata = json.loads(metadata_str)
                except KeyError:
                    # no metadata in tar file
                    self.metadata = None
        else:
            self.zones = dict()
            self.metadata = None

def get(self, name, default=None):
        """
        Wrapper for :func:`ZoneInfoFile.zones.get`. This is a convenience method
        for retrieving zones from the zone dictionary.

:param name:
            The name of the zone to retrieve. (Generally IANA zone names)

:param default:
            The value to return in the event of a missing key.

.. versionadded:: 2.6.0

"""
        return self.zones.get(name, default)

# The current API has gettz as a module function, although in fact it taps into
# a stateful class. So as a workaround for now, without changing the API, we
# will create a new "global" class instance the first time a user requests a
# timezone. Ugly, but adheres to the api.
#
# TODO: Remove after deprecation period.
_CLASS_ZONE_INSTANCE = list()

def get_zonefile_instance(new_instance=False):
    """
    This is a convenience function which provides a :class:`ZoneInfoFile`
    instance using the data provided by the ``dateutil`` package. By default, it
    caches a single instance of the ZoneInfoFile object and returns that.

:param new_instance:
        If ``True``, a new instance of :class:`ZoneInfoFile` is instantiated and
        used as the cached instance for the next call. Otherwise, new instances
        are created only as necessary.

:return:
        Returns a :class:`ZoneInfoFile` object.

.. versionadded:: 2.6
    """
    if new_instance:
        zif = None
    else:
        zif = getattr(get_zonefile_instance, '_cached_instance', None)

if zif is None:
        zif = ZoneInfoFile(getzoneinfofile_stream())

get_zonefile_instance._cached_instance = zif

return zif

def gettz(name):
    """
    This retrieves a time zone from the local zoneinfo tarball that is packaged
    with dateutil.

:param name:
        An IANA-style time zone name, as found in the zoneinfo file.

:return:
        Returns a :class:`dateutil.tz.tzfile` time zone object.

.. warning::
        It is generally inadvisable to use this function, and it is only
        provided for API compatibility with earlier versions. This is *not*
        equivalent to ``dateutil.tz.gettz()``, which selects an appropriate
        time zone based on the inputs, favoring system zoneinfo. This is ONLY
        for accessing the dateutil-specific zoneinfo (which may be out of
        date compared to the system zoneinfo).

.. deprecated:: 2.6
        If you need to use a specific zoneinfofile over the system zoneinfo,
        instantiate a :class:`dateutil.zoneinfo.ZoneInfoFile` object and call
        :func:`dateutil.zoneinfo.ZoneInfoFile.get(name)` instead.

Use :func:`get_zonefile_instance` to retrieve an instance of the
        dateutil-provided zoneinfo.
    """
    warnings.warn("zoneinfo.gettz() will be removed in future versions, "
                  "to use the dateutil-provided zoneinfo files, instantiate a "
                  "ZoneInfoFile object and use ZoneInfoFile.zones.get() "
                  "instead. See the documentation for details.",
                  DeprecationWarning)

if len(_CLASS_ZONE_INSTANCE) == 0:
        _CLASS_ZONE_INSTANCE.append(ZoneInfoFile(getzoneinfofile_stream()))
    return _CLASS_ZONE_INSTANCE[0].zones.get(name)

def gettz_db_metadata():
    """ Get the zonefile metadata

See `zonefile_metadata`_

:returns:
        A dictionary with the database metadata

.. deprecated:: 2.6
        See deprecation warning in :func:`zoneinfo.gettz`. To get metadata,
        query the attribute ``zoneinfo.ZoneInfoFile.metadata``.
    """
    warnings.warn("zoneinfo.gettz_db_metadata() will be removed in future "
                  "versions, to use the dateutil-provided zoneinfo files, "
                  "ZoneInfoFile object and query the 'metadata' attribute "
                  "instead. See the documentation for details.",
                  DeprecationWarning)

if len(_CLASS_ZONE_INSTANCE) == 0:
        _CLASS_ZONE_INSTANCE.append(ZoneInfoFile(getzoneinfofile_stream()))
    return _CLASS_ZONE_INSTANCE[0].metadata

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