Onionr/onionr/communicatorutils/downloadblocks.py

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'''
Onionr - Private P2P Communication
Download blocks using the communicator instance
'''
'''
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
'''
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import communicator, onionrexceptions
import logger, onionrpeers
from onionrutils import blockmetadata, stringvalidators, validatemetadata
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def download_blocks_from_communicator(comm_inst):
assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
for blockHash in list(comm_inst.blockQueue):
if len(comm_inst.onlinePeers) == 0:
break
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triedQueuePeers = [] # List of peers we've tried for a block
try:
blockPeers = list(comm_inst.blockQueue[blockHash])
except KeyError:
blockPeers = []
removeFromQueue = True
if comm_inst.shutdown or not comm_inst.isOnline:
# Exit loop if shutting down or offline
break
# Do not download blocks being downloaded or that are already saved (edge cases)
if blockHash in comm_inst.currentDownloading:
#logger.debug('Already downloading block %s...' % blockHash)
continue
if blockHash in comm_inst._core.getBlockList():
#logger.debug('Block %s is already saved.' % (blockHash,))
try:
del comm_inst.blockQueue[blockHash]
except KeyError:
pass
continue
if comm_inst._core._blacklist.inBlacklist(blockHash):
continue
if comm_inst._core.storage_counter.isFull():
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break
comm_inst.currentDownloading.append(blockHash) # So we can avoid concurrent downloading in other threads of same block
if len(blockPeers) == 0:
peerUsed = comm_inst.pickOnlinePeer()
else:
blockPeers = comm_inst._core._crypto.randomShuffle(blockPeers)
peerUsed = blockPeers.pop(0)
if not comm_inst.shutdown and peerUsed.strip() != '':
logger.info("Attempting to download %s from %s..." % (blockHash[:12], peerUsed))
content = comm_inst.peerAction(peerUsed, 'getdata/' + blockHash) # block content from random peer (includes metadata)
if content != False and len(content) > 0:
try:
content = content.encode()
except AttributeError:
pass
realHash = comm_inst._core._crypto.sha3Hash(content)
try:
realHash = realHash.decode() # bytes on some versions for some reason
except AttributeError:
pass
if realHash == blockHash:
content = content.decode() # decode here because sha3Hash needs bytes above
metas = blockmetadata.get_block_metadata_from_data(content) # returns tuple(metadata, meta), meta is also in metadata
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metadata = metas[0]
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
logger.info('Attempting to save block %s...' % blockHash[:12])
try:
comm_inst._core.setData(content)
except onionrexceptions.DiskAllocationReached:
logger.error('Reached disk allocation allowance, cannot save block %s.' % blockHash)
removeFromQueue = False
else:
comm_inst._core.addToBlockDB(blockHash, dataSaved=True)
blockmetadata.process_block_metadata(comm_inst._core, blockHash) # caches block metadata values to block database
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else:
logger.warn('POW failed for block %s.' % blockHash)
else:
if comm_inst._core._blacklist.inBlacklist(realHash):
logger.warn('Block %s is blacklisted.' % (realHash,))
else:
logger.warn('Metadata for block %s is invalid.' % blockHash)
comm_inst._core._blacklist.addToDB(blockHash)
else:
# if block didn't meet expected hash
tempHash = comm_inst._core._crypto.sha3Hash(content) # lazy hack, TODO use var
try:
tempHash = tempHash.decode()
except AttributeError:
pass
# Punish peer for sharing invalid block (not always malicious, but is bad regardless)
onionrpeers.PeerProfiles(peerUsed, comm_inst._core).addScore(-50)
if tempHash != 'ed55e34cb828232d6c14da0479709bfa10a0923dca2b380496e6b2ed4f7a0253':
# Dumb hack for 404 response from peer. Don't log it if 404 since its likely not malicious or a critical error.
logger.warn('Block hash validation failed for ' + blockHash + ' got ' + tempHash)
else:
removeFromQueue = False # Don't remove from queue if 404
if removeFromQueue:
try:
del comm_inst.blockQueue[blockHash] # remove from block queue both if success or false
logger.info('%s blocks remaining in queue' % [len(comm_inst.blockQueue)], terminal=True)
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except KeyError:
pass
comm_inst.currentDownloading.remove(blockHash)
comm_inst.decrementThreadCount('getBlocks')