Onionr/onionr/communicatorutils/downloadblocks/__init__.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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from . import shoulddownload
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from communicator import peeraction, onlinepeers
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import onionrcrypto, onionrstorage, onionrblacklist, storagecounter
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def download_blocks_from_communicator(comm_inst):
assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
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crypto = onionrcrypto.OnionrCrypto()
blacklist = onionrblacklist.OnionrBlackList()
storage_counter = storagecounter.StorageCounter()
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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 not shoulddownload.should_download(comm_inst, blockHash):
continue
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if comm_inst.shutdown or not comm_inst.isOnline or storage_counter.isFull():
# 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:
#logger.debug('Already downloading block %s...' % blockHash)
continue
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comm_inst.currentDownloading.append(blockHash) # So we can avoid concurrent downloading in other threads of same block
if len(blockPeers) == 0:
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peerUsed = onlinepeers.pick_online_peer(comm_inst)
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else:
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blockPeers = crypto.randomShuffle(blockPeers)
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peerUsed = blockPeers.pop(0)
if not comm_inst.shutdown and peerUsed.strip() != '':
logger.info("Attempting to download %s from %s..." % (blockHash[:12], peerUsed))
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content = peeraction.peer_action(comm_inst, 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:
try:
content = content.encode()
except AttributeError:
pass
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realHash = ccrypto.sha3Hash(content)
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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]
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if validatemetadata.validate_metadata(metadata, metas[2]): # check if metadata is valid, and verify nonce
if crypto.verifyPow(content): # check if POW is enough/correct
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logger.info('Attempting to save block %s...' % blockHash[:12])
try:
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onionrstorage.setdata.set_data(content)
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except onionrexceptions.DataExists:
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
else:
blockmetadb.add_to_block_DB(blockHash, dataSaved=True) # add block to meta db
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blockmetadata.process_block_metadata(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 blacklist.inBlacklist(realHash):
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logger.warn('Block %s is blacklisted.' % (realHash,))
else:
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logger.warn('Metadata for block %s is invalid.' % (blockHash,))
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blacklist.addToDB(blockHash)
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else:
# if block didn't meet expected hash
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tempHash = crypto.sha3Hash(content) # lazy hack, TODO use var
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try:
tempHash = tempHash.decode()
except AttributeError:
pass
# Punish peer for sharing invalid block (not always malicious, but is bad regardless)
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onionrpeers.PeerProfiles(peerUsed).addScore(-50)
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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')