from binascii import hexlify, unhexlify from os import listdir, makedirs, path, remove, rmdir import string from threading import RLock import time import traceback from paths import lookupAppdataFolder from storage import InventoryStorage, InventoryItem class FilesystemInventory(InventoryStorage): topDir = "inventory" objectDir = "objects" metadataFilename = "metadata" dataFilename = "data" def __init__(self): super(self.__class__, 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) self.lock = RLock() # Guarantees that two receiveDataThreads don't receive and process the same message concurrently (probably sent by a malicious individual) self._inventory = {} self._load() def __contains__(self, hash): retval = False for streamDict in self._inventory.values(): if hash in streamDict: return True return False def __getitem__(self, hash): for streamDict in self._inventory.values(): try: retval = streamDict[hash] except KeyError: continue if retval.payload is None: retval = InventoryItem(retval.type, retval.stream, self.getData(hash), retval.expires, retval.tag) return retval raise KeyError(hash) def __setitem__(self, hash, value): with self.lock: value = InventoryItem(*value) try: makedirs(path.join(self.baseDir, FilesystemInventory.objectDir, hexlify(hash))) except OSError: pass try: with open(path.join(self.baseDir, FilesystemInventory.objectDir, hexlify(hash), 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(hash), FilesystemInventory.dataFilename), 'w') as f: f.write(value.payload) except IOError: raise KeyError try: self._inventory[value.stream][hash] = value except KeyError: self._inventory[value.stream] = {} self._inventory[value.stream][hash] = value def __delitem__(self, hash): for stream in self._inventory.keys(): try: del self._inventory[stream][hash] except KeyError: pass with self.lock: try: remove(path.join(self.baseDir, FilesystemInventory.objectDir, hexlify(hash), FilesystemInventory.metadataFilename)) except IOError: pass try: remove(path.join(self.baseDir, FilesystemInventory.objectDir, hexlify(hash), FilesystemInventory.dataFilename)) except IOError: pass try: rmdir(path.join(self.baseDir, FilesystemInventory.objectDir, hexlify(hash))) 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: print "error loading %s" % (hexlify(hashId)) pass self._inventory = newInventory # for i, v in self._inventory.items(): # print "loaded stream: %s, %i items" % (i, len(v)) def stream_list(self): return self._inventory.keys() def object_list(self): return [unhexlify(x) for x in listdir(path.join(self.baseDir, FilesystemInventory.objectDir))] def getData(self, hashId): 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): try: with open(path.join(self.baseDir, FilesystemInventory.objectDir, hexlify(hashId), FilesystemInventory.metadataFilename), 'r') as f: objectType, streamNumber, expiresTime, tag, undef = string.split(f.read(), ",", 4) return [int(objectType), int(streamNumber), int(expiresTime), unhexlify(tag)] except IOError: raise KeyError def by_type_and_tag(self, objectType, tag): retval = [] for stream, streamDict in self._inventory: 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): try: return self._inventory[stream].keys() except KeyError: return [] def unexpired_hashes_by_stream(self, 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): self._load() def clean(self): minTime = int(time.time()) - (60 * 60 * 30) deletes = [] for stream, streamDict in self._inventory.items(): for hashId, item in streamDict.items(): if item.expires < minTime: deletes.append(hashId) for hashId in deletes: del self[hashId]