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# -*- coding: utf-8 -*-
"""
Copyright (c) 2003-2005 Gustavo Niemeyer <gustavo@niemeyer.net>
This module offers extensions to the standard Python
datetime module.
"""
from dateutil.tz import tzfile
from tarfile import TarFile
import os
__author__ = "Tomi Pieviläinen <tomi.pievilainen@iki.fi>"
__license__ = "Simplified BSD"
__all__ = ["setcachesize", "gettz", "rebuild"]
CACHE = []
CACHESIZE = 10
class tzfile(tzfile):
def __reduce__(self):
return (gettz, (self._filename,))
def getzoneinfofile():
filenames = sorted(os.listdir(os.path.join(os.path.dirname(__file__))))
filenames.reverse()
for entry in filenames:
if entry.startswith("zoneinfo") and ".tar." in entry:
return os.path.join(os.path.dirname(__file__), entry)
return None
ZONEINFOFILE = getzoneinfofile()
del getzoneinfofile
def setcachesize(size):
global CACHESIZE, CACHE
CACHESIZE = size
del CACHE[size:]
def gettz(name):
tzinfo = None
if ZONEINFOFILE:
for cachedname, tzinfo in CACHE:
if cachedname == name:
break
else:
tf = TarFile.open(ZONEINFOFILE)
try:
zonefile = tf.extractfile(name)
except KeyError:
tzinfo = None
else:
tzinfo = tzfile(zonefile)
tf.close()
CACHE.insert(0, (name, tzinfo))
del CACHE[CACHESIZE:]
return tzinfo
def rebuild(filename, tag=None, format="gz"):
import tempfile, shutil
tmpdir = tempfile.mkdtemp()
zonedir = os.path.join(tmpdir, "zoneinfo")
moduledir = os.path.dirname(__file__)
if tag: tag = "-"+tag
targetname = "zoneinfo%s.tar.%s" % (tag, format)
try:
tf = TarFile.open(filename)
# The "backwards" zone file contains links to other files, so must be
# processed as last
for name in sorted(tf.getnames(),
key=lambda k: k != "backward" and k or "z"):
if not (name.endswith(".sh") or
name.endswith(".tab") or
name == "leapseconds"):
tf.extract(name, tmpdir)
filepath = os.path.join(tmpdir, name)
os.system("zic -d %s %s" % (zonedir, filepath))
tf.close()
target = os.path.join(moduledir, targetname)
for entry in os.listdir(moduledir):
if entry.startswith("zoneinfo") and ".tar." in entry:
os.unlink(os.path.join(moduledir, entry))
tf = TarFile.open(target, "w:%s" % format)
for entry in os.listdir(zonedir):
entrypath = os.path.join(zonedir, entry)
tf.add(entrypath, entry)
tf.close()
finally:
shutil.rmtree(tmpdir)
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