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"""
"""
from datetime import datetime, timedelta
from dateutil import parser as DateParser
import errno
import fuse
import grp
import logging
import pwd
import stat
class Base(object):
"""
Base class for filesystem nodes.
"""
def __init__(self, root, name):
self.logger = logging.getLogger()
self.root = root
self.bsock = root.bsock
self.id = None
self.set_name(name)
self.stat = fuse.Stat()
self.xattr = {}
self.content = None
self.subnodes = {}
self.subnodes_old = self.subnodes.copy()
self.static = False
self.lastupdate = None
# timeout for caching
self.cache_timeout = timedelta(seconds=60)
@classmethod
def get_id(cls, *args, **kwargs):
"""
To enable reusing instances at different places in the filesystem,
this method must be overwritten
and return a unique id (string) for this class.
The parameter of this must be identical to the parameter
of the __init__ method must be identical to the parameter of get_id,
except that the "root" parameter is excluded.
"""
return None
# Interface
# =========
def get_name(self):
return self.name
def set_name(self, name):
self.name = name
def set_static(self, value=True):
self.static = value
def get_stat(self):
return self.stat
def set_stat(self, stat):
try:
if stat['mode'] > 0:
self.stat.st_mode = stat['mode']
self.stat.st_size = stat['size']
self.stat.st_atime = stat['atime']
self.stat.st_ctime = stat['ctime']
self.stat.st_mtime = stat['mtime']
except KeyError as e:
self.logger.warning(str(e))
pass
try:
uid = pwd.getpwnam(stat['user']).pw_uid
self.stat.st_uid = uid
except KeyError as e:
self.logger.info("user %s not known on this system, fall back to uid 0" % (stat['user']))
pass
try:
gid = grp.getgrnam(stat['group']).gr_gid
self.stat.st_gid = gid
except KeyError as e:
self.logger.info("group %s not known on this system, fall back to gid 0" % (stat['group']))
pass
#"stat": {
#"atime": 1441134679,
#"ino": 3689524,
#"dev": 2051,
#"mode": 33256,
#"nlink": 1,
#"user": "joergs",
#"group": "joergs",
#"ctime": 1441134679,
#"rdev": 0,
#"size": 1613,
#"mtime": 1441134679
#},
def add_subnode(self, classtype, *args, **kwargs):
instance = self.root.factory.get_instance(classtype, *args, **kwargs)
name = instance.get_name()
if not self.subnodes.has_key(name):
self.subnodes[name] = instance
else:
if self.subnodes_old.has_key(name):
del(self.subnodes_old[name])
def update(self):
# update status, content, ...
now = datetime.now()
if self.lastupdate == None:
self.logger.debug("reason: first time")
self.do_update()
self.lastupdate = now
elif not self.static and (self.lastupdate + self.cache_timeout) < now:
diff = now - self.lastupdate
self.logger.debug("reason: non-static and timeout (%d seconds)" % (diff.seconds))
# store current subnodes
# and delete all not updated subnodes after do_update()
self.subnodes_old = self.subnodes.copy()
self.do_update()
for i in self.subnodes_old.keys():
self.logger.debug("%s: removing outdated node %s" % (self.get_name(), i))
del(self.subnodes[i])
self.lastupdate = datetime.now()
else:
self.logger.debug("skipped (lastupdate: %s, static: %s)" % ( str(self.lastupdate), str(self.static)))
def do_update(self):
"""
dummy, to be overwritten (not inherited!) by inherented classes
"""
# if no node specific do_update exists,
# remove marker for nodes to be deleted after update
self.subnodes_old = {}
# Filesystem methods
# ==================
def getattr(self, path):
#self.logger.debug("%s(\"%s\")" % (str(self), str(path)))
result = -errno.ENOENT
if path.len() == 0:
self.update()
result = self.get_stat()
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].getattr(path)
return result
def read(self, path, size, offset):
#self.logger.debug("%s(\"%s\", %d, %d)" % (str(self), str(path), size, offset))
result = -errno.ENOENT
if path.len() == 0:
self.logger.debug( "content: " + str(self.content) )
self.update()
if self.content != None:
result = self.content[offset:offset+size]
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].read(path, size, offset)
return result
def readlink(self, path):
#self.logger.debug("%s(\"%s\", %d, %d)" % (str(self), str(path), size, offset))
result = -errno.ENOENT
if path.len() == 0:
pass
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].readlink(path)
return result
def listxattr(self, path):
'''
list extended attributes
'''
#self.logger.debug("%s(\"%s\", %s)" % (str(self.get_name()), str(path), str(size)))
result = []
if path.len() == 0:
result = self.xattr.keys()
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].listxattr(path)
return result
def getxattr(self, path, key):
'''
get value of extended attribute
'''
#self.logger.debug("%s(\"%s\")" % (str(self), str(path)))
result = None
if path.len() == 0:
try:
result = self.xattr[key]
except KeyError:
pass
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].getxattr(path, key)
return result
def setxattr(self, path, key, value, flags):
'''
set value of extended attribute
'''
#self.logger.debug("%s(\"%s\")" % (str(self), str(path)))
#result = -errno.EOPNOTSUPP
result = 0
if path.len() == 0:
self.xattr[key] = value
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].setxattr(path, key, value, flags)
return result
def rename(self, oldpath, newpath):
self.logger.debug("%s(\"%s %s\")" % (str(self), str(oldpath), str(newpath)))
result = -errno.ENOENT
if path.len() == 0:
#self.update()
#result = self.get_stat()
pass
else:
if path.get(0) in self.subnodes:
topdir = path.shift()
result = self.subnodes[topdir].rename(oldpath, newpath)
return result
# Helpers
# =======
def _convert_date_bareos_unix(self, bareosdate):
unixtimestamp = 0
try:
unixtimestamp = int(DateParser.parse(bareosdate).strftime("%s"))
self.logger.debug( "unix timestamp: %d" % (unixtimestamp))
except ValueError:
pass
return unixtimestamp
|
