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# -*- coding: utf-8 -*- import warnings import json from tarfile import TarFile from pkgutil import get_data from io import BytesIO from dateutil.tz import tzfile as _tzfile __all__ = ["get_zonefile_instance", "gettz", "gettz_db_metadata"] ZONEFILENAME = "dateutil-zoneinfo.tar.gz" METADATA_FN = 'METADATA' 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 TarFile.open(fileobj=zonefile_stream) as tf: self.zones = {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()} 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 = {} 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 = [] 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