/usr/share/pyshared/suds/cache.py is in python-suds 0.4.1-2ubuntu1.1.
This file is owned by root:root, with mode 0o644.
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# it under the terms of the (LGPL) GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library Lesser General Public License for more details at
# ( http://www.gnu.org/licenses/lgpl.html ).
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# written by: Jeff Ortel ( jortel@redhat.com )
"""
Contains basic caching classes.
"""
import os
import tempfile
import suds
from tempfile import gettempdir as tmp
from suds.transport import *
from suds.sax.parser import Parser
from suds.sax.element import Element
from datetime import datetime as dt
from datetime import timedelta
from cStringIO import StringIO
from logging import getLogger
try:
import cPickle as pickle
except:
import pickle
log = getLogger(__name__)
class Cache:
"""
An object object cache.
"""
def get(self, id):
"""
Get a object from the cache by ID.
@param id: The object ID.
@type id: str
@return: The object, else None
@rtype: any
"""
raise Exception('not-implemented')
def getf(self, id):
"""
Get a object from the cache by ID.
@param id: The object ID.
@type id: str
@return: The object, else None
@rtype: any
"""
raise Exception('not-implemented')
def put(self, id, object):
"""
Put a object into the cache.
@param id: The object ID.
@type id: str
@param object: The object to add.
@type object: any
"""
raise Exception('not-implemented')
def putf(self, id, fp):
"""
Write a fp into the cache.
@param id: The object ID.
@type id: str
@param fp: File pointer.
@type fp: file-like object.
"""
raise Exception('not-implemented')
def purge(self, id):
"""
Purge a object from the cache by id.
@param id: A object ID.
@type id: str
"""
raise Exception('not-implemented')
def clear(self):
"""
Clear all objects from the cache.
"""
raise Exception('not-implemented')
class NoCache(Cache):
"""
The passthru object cache.
"""
def get(self, id):
return None
def getf(self, id):
return None
def put(self, id, object):
pass
def putf(self, id, fp):
pass
class FileCache(Cache):
"""
A file-based URL cache.
@cvar fnprefix: The file name prefix.
@type fnsuffix: str
@ivar duration: The cached file duration which defines how
long the file will be cached.
@type duration: (unit, value)
@ivar location: The directory for the cached files.
@type location: str
"""
fnprefix = 'suds'
units = ('months', 'weeks', 'days', 'hours', 'minutes', 'seconds')
def __init__(self, location=None, **duration):
"""
@param location: The directory for the cached files.
@type location: str
@param duration: The cached file duration which defines how
long the file will be cached. A duration=0 means forever.
The duration may be: (months|weeks|days|hours|minutes|seconds).
@type duration: {unit:value}
"""
if location is None:
location = tempfile.mkdtemp()
self.location = location
self.duration = (None, 0)
self.setduration(**duration)
self.checkversion()
def fnsuffix(self):
"""
Get the file name suffix
@return: The suffix
@rtype: str
"""
return 'gcf'
def setduration(self, **duration):
"""
Set the caching duration which defines how long the
file will be cached.
@param duration: The cached file duration which defines how
long the file will be cached. A duration=0 means forever.
The duration may be: (months|weeks|days|hours|minutes|seconds).
@type duration: {unit:value}
"""
if len(duration) == 1:
arg = duration.items()[0]
if not arg[0] in self.units:
raise Exception('must be: %s' % str(self.units))
self.duration = arg
return self
def setlocation(self, location):
"""
Set the location (directory) for the cached files.
@param location: The directory for the cached files.
@type location: str
"""
self.location = location
def mktmp(self):
"""
Make the I{location} directory if it doesn't already exits.
"""
try:
if not os.path.isdir(self.location):
os.makedirs(self.location)
except:
log.debug(self.location, exc_info=1)
return self
def put(self, id, bfr):
try:
fn = self.__fn(id)
f = self.open(fn, 'w')
f.write(bfr)
f.close()
return bfr
except:
log.debug(id, exc_info=1)
return bfr
def putf(self, id, fp):
try:
fn = self.__fn(id)
f = self.open(fn, 'w')
f.write(fp.read())
fp.close()
f.close()
return open(fn)
except:
log.debug(id, exc_info=1)
return fp
def get(self, id):
try:
f = self.getf(id)
bfr = f.read()
f.close()
return bfr
except:
pass
def getf(self, id):
try:
fn = self.__fn(id)
self.validate(fn)
return self.open(fn)
except:
pass
def validate(self, fn):
"""
Validate that the file has not expired based on the I{duration}.
@param fn: The file name.
@type fn: str
"""
if self.duration[1] < 1:
return
created = dt.fromtimestamp(os.path.getctime(fn))
d = { self.duration[0]:self.duration[1] }
expired = created+timedelta(**d)
if expired < dt.now():
log.debug('%s expired, deleted', fn)
os.remove(fn)
def clear(self):
for fn in os.listdir(self.location):
if os.path.isdir(fn):
continue
if fn.startswith(self.fnprefix):
log.debug('deleted: %s', fn)
os.remove(os.path.join(self.location, fn))
def purge(self, id):
fn = self.__fn(id)
try:
os.remove(fn)
except:
pass
def open(self, fn, *args):
"""
Open the cache file making sure the directory is created.
"""
self.mktmp()
return open(fn, *args)
def checkversion(self):
path = os.path.join(self.location, 'version')
try:
f = self.open(path)
version = f.read()
f.close()
if version != suds.__version__:
raise Exception()
except:
self.clear()
f = self.open(path, 'w')
f.write(suds.__version__)
f.close()
def __fn(self, id):
name = id
suffix = self.fnsuffix()
fn = '%s-%s.%s' % (self.fnprefix, name, suffix)
return os.path.join(self.location, fn)
class DocumentCache(FileCache):
"""
Provides xml document caching.
"""
def fnsuffix(self):
return 'xml'
def get(self, id):
try:
fp = FileCache.getf(self, id)
if fp is None:
return None
p = Parser()
return p.parse(fp)
except:
FileCache.purge(self, id)
def put(self, id, object):
if isinstance(object, Element):
FileCache.put(self, id, str(object))
return object
class ObjectCache(FileCache):
"""
Provides pickled object caching.
@cvar protocol: The pickling protocol.
@type protocol: int
"""
protocol = 2
def fnsuffix(self):
return 'px'
def get(self, id):
try:
fp = FileCache.getf(self, id)
if fp is None:
return None
else:
return pickle.load(fp)
except:
FileCache.purge(self, id)
def put(self, id, object):
bfr = pickle.dumps(object, self.protocol)
FileCache.put(self, id, bfr)
return object
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