def __init__(self,*args,**kwargs):
self.logger = logging.getLogger("MysteryMachine.store.file_store")
self.logger.debug( args)
super(filestore,self).__init__(*args,**kwargs)
uri = args[0]
create = kwargs.setdefault('create',False)
self.path = self.GetCanonicalUri(GetPath(uri))
self._lock = RRwLock()
if create:
os.mkdir(self.path)
#Create a transaction Log object
self.tlog = FileLogger(self.path, track_state = False)
self.newobjs = []
self.newcat = []
self.newattr = {}
class filestore(Base):
"""
A basic persistent Store which is designed to be simple but complaint
with the Mysterymachine interface.
There are no SCM methods attached to this store - will we
create a mixin for the SCM actions.
Reading data during a transaction yields undefined values. It can
return pre-xaction values or current balues.
"""
uriScheme = "attrfile"
supports_txn = True
invalidobj = re.compile("^\.")
@staticmethod
def GetCanonicalUri(uri):
#Canonical filepath.
return os.path.normcase(os.path.normpath(os.path.realpath(os.path.expanduser(uri))))
def __init__(self,*args,**kwargs):
self.logger = logging.getLogger("MysteryMachine.store.file_store")
self.logger.debug( args)
super(filestore,self).__init__(*args,**kwargs)
uri = args[0]
create = kwargs.setdefault('create',False)
self.path = self.GetCanonicalUri(GetPath(uri))
self._lock = RRwLock()
if create:
os.mkdir(self.path)
#Create a transaction Log object
self.tlog = FileLogger(self.path, track_state = False)
self.newobjs = []
self.newcat = []
self.newattr = {}
def close(self,):
self.tlog.close()
def get_path(self):
return self.path
def start_store_transaction(self,):
self._lock.acquire_read()
try:
self.tx = self.tlog.start_transaction()
except:
self._lock.release()
raise
def commit_store_transaction(self,):
self.tlog.commit_transaction(self.tx)
self.newobjs = []
self.newcat = []
self.newattr = {}
self._lock.release()
def abort_store_transaction(self,):
self.tlog.abort_transaction(self.tx)
self.newobjs = []
self.newcat = []
self.newattr = {}
self._lock.release()
def EnumCategories(self):
for dentry in os.listdir(self.path):
#Skip directories which we don't manage.
#Current plan is to have one directory per store inside the
# system if multiple stores are used.
if os.path.isdir(os.path.join(self.path , dentry )):
#Ignore hidden directories
if dentry[0] != '.':
if os.path.isfile(os.path.join(self.path,dentry,CATEGORY_SENTINEL_NAME)):
yield dentry
def EnumObjects(self,category):
catpath = self.canonicalise(category)
if catpath not in self.newcat:
for dentry in os.listdir(os.path.join(self.path,*catpath)):
objpath = catpath + [ dentry ]
if not os.path.isdir(os.path.join(self.path,*objpath)) : continue
sentinelpath = objpath + [ OBJECT_SENTINEL_NAME ]
if not os.path.isfile(os.path.join(self.path,*sentinelpath)): continue
yield dentry
for obj in self.newobjs:
#Search for obj created this txn, in this category.
if obj[:len(catpath)] == catpath:
yield obj[len(catpath)]
def NewCategory(self,category):
can_catpath = self.canonicalise(category)
catpath = os.path.join( *can_catpath)
try:
self.tlog.Create_Dir(self.tx,catpath)
except OSError, e:
#Ignore Directory already exists errors .
if e.errno != errno.EEXIST: raise
except WindowsError, e:
#Ignore Directory already exists errors .
if e.errno != 183: raise
