PyBitmessage-2021-04-27/src/storage/filesystem.py

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