90 lines
3.0 KiB
Python
90 lines
3.0 KiB
Python
'''
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Onionr - P2P Anonymous Storage Network
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This file handles block storage, providing an abstraction for storing blocks between file system and database
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'''
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'''
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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import core, sys, sqlite3, os, dbcreator
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DB_ENTRY_SIZE_LIMIT = 10000 # Will be a config option
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class BlockCache:
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def __init__(self):
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self.blocks = {}
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def cleanCache(self):
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while sys.getsizeof(self.blocks) > 100000000:
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self.blocks.pop(list(self.blocks.keys())[0])
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def dbCreate(coreInst):
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try:
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dbcreator.DBCreator(coreInst).createBlockDataDB()
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except FileExistsError:
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pass
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def _dbInsert(coreInst, blockHash, data):
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assert isinstance(coreInst, core.Core)
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dbCreate(coreInst)
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conn = sqlite3.connect(coreInst.blockDataDB, timeout=10)
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c = conn.cursor()
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data = (blockHash, data)
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c.execute('INSERT INTO blockData (hash, data) VALUES(?, ?);', data)
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conn.commit()
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conn.close()
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def _dbFetch(coreInst, blockHash):
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assert isinstance(coreInst, core.Core)
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dbCreate(coreInst)
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conn = sqlite3.connect(coreInst.blockDataDB, timeout=10)
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c = conn.cursor()
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for i in c.execute('SELECT data from blockData where hash = ?', (blockHash,)):
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return i[0]
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conn.commit()
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conn.close()
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return None
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def store(coreInst, data, blockHash=''):
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assert isinstance(coreInst, core.Core)
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assert coreInst._utils.validateHash(blockHash)
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ourHash = coreInst._crypto.sha3Hash(data)
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if blockHash != '':
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assert ourHash == blockHash
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else:
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blockHash = ourHash
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if DB_ENTRY_SIZE_LIMIT >= sys.getsizeof(data):
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_dbInsert(coreInst, blockHash, data)
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else:
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with open('%s/%s.dat' % (coreInst.blockDataLocation, blockHash), 'wb') as blockFile:
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blockFile.write(data)
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coreInst.blockCache.cleanCache()
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def getData(coreInst, bHash):
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assert isinstance(coreInst, core.Core)
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assert coreInst._utils.validateHash(bHash)
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bHash = coreInst._utils.bytesToStr(bHash)
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# First check DB for data entry by hash
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# if no entry, check disk
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# If no entry in either, raise an exception
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retData = None
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fileLocation = '%s/%s.dat' % (coreInst.blockDataLocation, bHash)
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if os.path.exists(fileLocation):
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with open(fileLocation, 'rb') as block:
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retData = block.read()
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else:
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retData = _dbFetch(coreInst, bHash)
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return retData |