def import_block_from_data(content):
blacklist = onionrblacklist.OnionrBlackList()
ret_data = False
try:
content = content.encode()
except AttributeError:
pass
data_hash = crypto.hashers.sha3_hash(content)
if blacklist.inBlacklist(data_hash):
raise BlacklistedBlock(f'%s is a blacklisted block {data_hash}')
# returns tuple(metadata, meta), meta is also in metadata
metas = blockmetadata.get_block_metadata_from_data(content)
metadata = metas[0]
# check if metadata is valid
if validatemetadata.validate_metadata(metadata, metas[2]):
# check if POW is enough/correct
if crypto.cryptoutils.verify_POW(content):
logger.info(f'Imported block passed proof, saving: {data_hash}.',
terminal=True)
try:
blockHash = onionrstorage.set_data(content)
except DiskAllocationReached:
logger.warn('Failed to save block due to full disk allocation')
raise
else:
blockmetadb.add_to_block_DB(blockHash, dataSaved=True)
# caches block metadata values to block database
blockmetadata.process_block_metadata(blockHash)
ret_data = blockHash
else:
raise InvalidProof
else:
raise InvalidMetadata
return ret_data
def download_blocks_from_communicator(comm_inst: "OnionrCommunicatorDaemon"):
"""Use communicator instance to download blocks in the comms's queue"""
blacklist = onionrblacklist.OnionrBlackList()
kv: "DeadSimpleKV" = comm_inst.shared_state.get_by_string("DeadSimpleKV")
LOG_SKIP_COUNT = 50 # for how many iterations we skip logging the counter
count: int = 0
metadata_validation_result: bool = False
# Iterate the block queue in the communicator
for blockHash in list(kv.get('blockQueue')):
count += 1
try:
blockPeers = list(kv.get('blockQueue')[blockHash])
except KeyError:
blockPeers = []
removeFromQueue = True
if not shoulddownload.should_download(comm_inst, blockHash):
continue
if kv.get('shutdown') or not kv.get('isOnline') or \
storage_counter.is_full():
# Exit loop if shutting down or offline, or disk allocation reached
break
# Do not download blocks being downloaded
if blockHash in kv.get('currentDownloading'):
continue
if len(kv.get('onlinePeers')) == 0:
break
# So we can avoid concurrent downloading in other threads of same block
kv.get('currentDownloading').append(blockHash)
if len(blockPeers) == 0:
try:
peerUsed = onlinepeers.pick_online_peer(comm_inst)
except onionrexceptions.OnlinePeerNeeded:
continue
else:
blockPeers = onionrcrypto.cryptoutils.random_shuffle(blockPeers)
peerUsed = blockPeers.pop(0)
if not kv.get('shutdown') and peerUsed.strip() != '':
logger.info(
f"Attempting to download %s from {peerUsed}..." % (blockHash[:12],))
content = peeraction.peer_action(
comm_inst, peerUsed,
'getdata/' + blockHash,
max_resp_size=3000000) # block content from random peer
if content is not False and len(content) > 0:
try:
content = content.encode()
except AttributeError:
pass
realHash = onionrcrypto.hashers.sha3_hash(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
metadata = metas[0]
try:
metadata_validation_result = \
validatemetadata.validate_metadata(metadata, metas[2])
except onionrexceptions.DataExists:
metadata_validation_result = False
if metadata_validation_result: # check if metadata is valid, and verify nonce
if onionrcrypto.cryptoutils.verify_POW(content): # check if POW is enough/correct
logger.info('Attempting to save block %s...' % blockHash[:12])
try:
onionrstorage.set_data(content)
except onionrexceptions.DataExists:
logger.warn('Data is already set for %s ' % (blockHash,))
except onionrexceptions.DiskAllocationReached:
logger.error('Reached disk allocation allowance, cannot save block %s.' % (blockHash,))
removeFromQueue = False
else:
blockmetadb.add_to_block_DB(blockHash, dataSaved=True) # add block to meta db
blockmetadata.process_block_metadata(blockHash) # caches block metadata values to block database
spawn(
local_command,
f'/daemon-event/upload_event',
post=True,
is_json=True,
post_data={'block': blockHash}
)
else:
logger.warn('POW failed for block %s.' % (blockHash,))
else:
if blacklist.inBlacklist(realHash):
logger.warn('Block %s is blacklisted.' % (realHash,))
else:
logger.warn('Metadata for block %s is invalid.' % (blockHash,))
blacklist.addToDB(blockHash)
else:
# if block didn't meet expected hash
tempHash = onionrcrypto.hashers.sha3_hash(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).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 kv.get('blockQueue')[blockHash] # remove from block queue both if success or false
if count == LOG_SKIP_COUNT:
logger.info('%s blocks remaining in queue' %
[len(kv.get('blockQueue'))], terminal=True)
count = 0
except KeyError:
pass
kv.get('currentDownloading').remove(blockHash)
comm_inst.decrementThreadCount('getBlocks')