115 lines
5.9 KiB
Python
Executable File
115 lines
5.9 KiB
Python
Executable File
'''
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Onionr - Private P2P Communication
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Download blocks using the communicator instance
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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 communicator, onionrexceptions
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import logger, onionrpeers
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from onionrutils import blockmetadata, stringvalidators, validatemetadata
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from . import shoulddownload
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def download_blocks_from_communicator(comm_inst):
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assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
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for blockHash in list(comm_inst.blockQueue):
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if len(comm_inst.onlinePeers) == 0:
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break
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triedQueuePeers = [] # List of peers we've tried for a block
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try:
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blockPeers = list(comm_inst.blockQueue[blockHash])
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except KeyError:
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blockPeers = []
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removeFromQueue = True
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if shoulddownload.should_download(comm_inst, blockHash):
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continue
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if comm_inst.shutdown or not comm_inst.isOnline or comm_inst._core.storage_counter.isFull():
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# Exit loop if shutting down or offline, or disk allocation reached
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break
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# Do not download blocks being downloaded
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if blockHash in comm_inst.currentDownloading:
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#logger.debug('Already downloading block %s...' % blockHash)
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continue
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comm_inst.currentDownloading.append(blockHash) # So we can avoid concurrent downloading in other threads of same block
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if len(blockPeers) == 0:
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peerUsed = comm_inst.pickOnlinePeer()
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else:
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blockPeers = comm_inst._core._crypto.randomShuffle(blockPeers)
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peerUsed = blockPeers.pop(0)
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if not comm_inst.shutdown and peerUsed.strip() != '':
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logger.info("Attempting to download %s from %s..." % (blockHash[:12], peerUsed))
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content = comm_inst.peerAction(peerUsed, 'getdata/' + blockHash, max_resp_size=3000000) # block content from random peer (includes metadata)
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if content != False and len(content) > 0:
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try:
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content = content.encode()
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except AttributeError:
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pass
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realHash = comm_inst._core._crypto.sha3Hash(content)
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try:
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realHash = realHash.decode() # bytes on some versions for some reason
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except AttributeError:
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pass
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if realHash == blockHash:
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content = content.decode() # decode here because sha3Hash needs bytes above
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metas = blockmetadata.get_block_metadata_from_data(content) # returns tuple(metadata, meta), meta is also in metadata
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metadata = metas[0]
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if validatemetadata.validate_metadata(comm_inst._core, metadata, metas[2]): # check if metadata is valid, and verify nonce
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if comm_inst._core._crypto.verifyPow(content): # check if POW is enough/correct
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logger.info('Attempting to save block %s...' % blockHash[:12])
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try:
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comm_inst._core.setData(content)
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except onionrexceptions.DataExists:
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logger.warn('Data is already set for %s ' % (blockHash,))
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except onionrexceptions.DiskAllocationReached:
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logger.error('Reached disk allocation allowance, cannot save block %s.' % (blockHash,))
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removeFromQueue = False
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else:
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comm_inst._core.addToBlockDB(blockHash, dataSaved=True)
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blockmetadata.process_block_metadata(comm_inst._core, blockHash) # caches block metadata values to block database
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else:
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logger.warn('POW failed for block %s.' % (blockHash,))
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else:
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if comm_inst._core._blacklist.inBlacklist(realHash):
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logger.warn('Block %s is blacklisted.' % (realHash,))
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else:
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logger.warn('Metadata for block %s is invalid.' % (blockHash,))
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comm_inst._core._blacklist.addToDB(blockHash)
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else:
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# if block didn't meet expected hash
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tempHash = comm_inst._core._crypto.sha3Hash(content) # lazy hack, TODO use var
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try:
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tempHash = tempHash.decode()
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except AttributeError:
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pass
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# Punish peer for sharing invalid block (not always malicious, but is bad regardless)
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onionrpeers.PeerProfiles(peerUsed, comm_inst._core).addScore(-50)
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if tempHash != 'ed55e34cb828232d6c14da0479709bfa10a0923dca2b380496e6b2ed4f7a0253':
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# Dumb hack for 404 response from peer. Don't log it if 404 since its likely not malicious or a critical error.
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logger.warn('Block hash validation failed for ' + blockHash + ' got ' + tempHash)
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else:
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removeFromQueue = False # Don't remove from queue if 404
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if removeFromQueue:
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try:
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del comm_inst.blockQueue[blockHash] # remove from block queue both if success or false
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logger.info('%s blocks remaining in queue' % [len(comm_inst.blockQueue)], terminal=True)
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except KeyError:
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pass
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comm_inst.currentDownloading.remove(blockHash)
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comm_inst.decrementThreadCount('getBlocks') |