PyBitmessage-2021-04-27/src/storage/filesystem.py
2020-12-30 20:01:33 +05:30

270 lines
9.0 KiB
Python

"""
Module for using filesystem (directory with files) for inventory storage
"""
import logging
import string
import time
from binascii import hexlify, unhexlify
from os import listdir, makedirs, path, remove, rmdir
from threading import RLock
from paths import lookupAppdataFolder
from storage import InventoryItem, InventoryStorage
logger = logging.getLogger('default')
class FilesystemInventory(InventoryStorage):
"""Filesystem for inventory storage"""
# pylint: disable=too-many-ancestors, abstract-method
topDir = "inventory"
objectDir = "objects"
metadataFilename = "metadata"
dataFilename = "data"
def __init__(self):
super(FilesystemInventory, self).__init__()
self.baseDir = path.join(
lookupAppdataFolder(), FilesystemInventory.topDir)
for createDir in [self.baseDir, path.join(self.baseDir, "objects")]:
if path.exists(createDir):
if not path.isdir(createDir):
raise IOError(
"%s exists but it's not a directory" % createDir)
else:
makedirs(createDir)
# Guarantees that two receiveDataThreads
# don't receive and process the same message
# concurrently (probably sent by a malicious individual)
self.lock = RLock()
self._inventory = {}
self._load()
def __contains__(self, hashval):
for streamDict in self._inventory.values():
if hashval in streamDict:
return True
return False
def __getitem__(self, hashval):
for streamDict in self._inventory.values():
try:
retval = streamDict[hashval]
except KeyError:
continue
if retval.payload is None:
retval = InventoryItem(
retval.type,
retval.stream,
self.getData(hashval),
retval.expires,
retval.tag)
return retval
raise KeyError(hashval)
def __setitem__(self, hashval, value):
with self.lock:
value = InventoryItem(*value)
try:
makedirs(path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashval)))
except OSError:
pass
try:
with open(
path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashval),
FilesystemInventory.metadataFilename,
),
"w",
) as f:
f.write("%s,%s,%s,%s," % (
value.type,
value.stream,
value.expires,
hexlify(value.tag)))
with open(
path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashval),
FilesystemInventory.dataFilename,
),
"w",
) as f:
f.write(value.payload)
except IOError:
raise KeyError
try:
self._inventory[value.stream][hashval] = value
except KeyError:
self._inventory[value.stream] = {}
self._inventory[value.stream][hashval] = value
def delHashId(self, hashval):
"""Remove object from inventory"""
for stream in self._inventory:
try:
del self._inventory[stream][hashval]
except KeyError:
pass
with self.lock:
try:
remove(
path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashval),
FilesystemInventory.metadataFilename))
except IOError:
pass
try:
remove(
path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashval),
FilesystemInventory.dataFilename))
except IOError:
pass
try:
rmdir(path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashval)))
except IOError:
pass
def __iter__(self):
elems = []
for streamDict in self._inventory.values():
elems.extend(streamDict.keys())
return elems.__iter__()
def __len__(self):
retval = 0
for streamDict in self._inventory.values():
retval += len(streamDict)
return retval
def _load(self):
newInventory = {}
for hashId in self.object_list():
try:
objectType, streamNumber, expiresTime, tag = self.getMetadata(
hashId)
try:
newInventory[streamNumber][hashId] = InventoryItem(
objectType, streamNumber, None, expiresTime, tag)
except KeyError:
newInventory[streamNumber] = {}
newInventory[streamNumber][hashId] = InventoryItem(
objectType, streamNumber, None, expiresTime, tag)
except KeyError:
logger.debug(
'error loading %s', hexlify(hashId), exc_info=True)
self._inventory = newInventory
# for i, v in self._inventory.items():
# print "loaded stream: %s, %i items" % (i, len(v))
def stream_list(self):
"""Return list of streams"""
return self._inventory.keys()
def object_list(self):
"""Return inventory vectors (hashes) from a directory"""
return [unhexlify(x) for x in listdir(path.join(
self.baseDir, FilesystemInventory.objectDir))]
def getData(self, hashId):
"""Get object data"""
try:
with open(
path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashId),
FilesystemInventory.dataFilename,
),
"r",
) as f:
return f.read()
except IOError:
raise AttributeError
def getMetadata(self, hashId):
"""Get object metadata"""
try:
with open(
path.join(
self.baseDir,
FilesystemInventory.objectDir,
hexlify(hashId),
FilesystemInventory.metadataFilename,
),
"r",
) as f:
objectType, streamNumber, expiresTime, tag = string.split(
f.read(), ",", 4)[:4]
return [
int(objectType),
int(streamNumber),
int(expiresTime),
unhexlify(tag)]
except IOError:
raise KeyError
def by_type_and_tag(self, objectType, tag):
"""Get a list of objects filtered by object type and tag"""
retval = []
for streamDict in self._inventory.values():
for hashId, item in streamDict:
if item.type == objectType and item.tag == tag:
try:
if item.payload is None:
item.payload = self.getData(hashId)
except IOError:
continue
retval.append(InventoryItem(
item.type,
item.stream,
item.payload,
item.expires,
item.tag))
return retval
def hashes_by_stream(self, stream):
"""Return inventory vectors (hashes) for a stream"""
try:
return self._inventory[stream].keys()
except KeyError:
return []
def unexpired_hashes_by_stream(self, stream):
"""Return unexpired hashes in the inventory for a particular stream"""
t = int(time.time())
try:
return [x for x, value in self._inventory[stream].items()
if value.expires > t]
except KeyError:
return []
def flush(self):
"""Flush the inventory and create a new, empty one"""
self._load()
def clean(self):
"""Clean out old items from the inventory"""
minTime = int(time.time()) - (60 * 60 * 30)
deletes = []
for streamDict in self._inventory.values():
for hashId, item in streamDict.items():
if item.expires < minTime:
deletes.append(hashId)
for hashId in deletes:
self.delHashId(hashId)