refactored communicator a bit
Kevin Froman
parent
a4d6dc5fa5
commit
2879595c66
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@ -0,0 +1,95 @@
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import communicator, onionrexceptions
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import logger
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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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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 comm_inst.shutdown or not comm_inst.isOnline:
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# Exit loop if shutting down or offline
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break
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# Do not download blocks being downloaded or that are already saved (edge cases)
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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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if blockHash in comm_inst._core.getBlockList():
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#logger.debug('Block %s is already saved.' % (blockHash,))
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try:
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del comm_inst.blockQueue[blockHash]
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except KeyError:
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pass
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continue
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if comm_inst._core._blacklist.inBlacklist(blockHash):
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continue
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if comm_inst._core._utils.storageCounter.isFull():
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break
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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) # 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 = comm_inst._core._utils.getBlockMetadataFromData(content) # returns tuple(metadata, meta), meta is also in metadata
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metadata = metas[0]
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if comm_inst._core._utils.validateMetadata(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.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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comm_inst._core._utils.processBlockMetadata(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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except KeyError:
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pass
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comm_inst.currentDownloading.remove(blockHash)
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comm_inst.decrementThreadCount('getBlocks')
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@ -0,0 +1,60 @@
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import logger, onionrproofs
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def lookup_blocks_from_communicator(comm_inst):
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logger.info('Looking up new blocks...')
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tryAmount = 2
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newBlocks = ''
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existingBlocks = comm_inst._core.getBlockList()
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triedPeers = [] # list of peers we've tried this time around
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maxBacklog = 1560 # Max amount of *new* block hashes to have already in queue, to avoid memory exhaustion
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lastLookupTime = 0 # Last time we looked up a particular peer's list
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for i in range(tryAmount):
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listLookupCommand = 'getblocklist' # This is defined here to reset it each time
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if len(comm_inst.blockQueue) >= maxBacklog:
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break
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if not comm_inst.isOnline:
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break
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# check if disk allocation is used
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if comm_inst._core._utils.storageCounter.isFull():
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logger.debug('Not looking up new blocks due to maximum amount of allowed disk space used')
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break
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peer = comm_inst.pickOnlinePeer() # select random online peer
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# if we've already tried all the online peers this time around, stop
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if peer in triedPeers:
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if len(comm_inst.onlinePeers) == len(triedPeers):
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break
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else:
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continue
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triedPeers.append(peer)
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# Get the last time we looked up a peer's stamp to only fetch blocks since then.
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# Saved in memory only for privacy reasons
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try:
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lastLookupTime = comm_inst.dbTimestamps[peer]
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except KeyError:
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lastLookupTime = 0
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else:
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listLookupCommand += '?date=%s' % (lastLookupTime,)
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try:
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newBlocks = comm_inst.peerAction(peer, listLookupCommand) # get list of new block hashes
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except Exception as error:
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logger.warn('Could not get new blocks from %s.' % peer, error = error)
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newBlocks = False
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else:
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comm_inst.dbTimestamps[peer] = comm_inst._core._utils.getRoundedEpoch(roundS=60)
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if newBlocks != False:
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# if request was a success
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for i in newBlocks.split('\n'):
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if comm_inst._core._utils.validateHash(i):
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# if newline seperated string is valid hash
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if not i in existingBlocks:
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# if block does not exist on disk and is not already in block queue
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if i not in comm_inst.blockQueue:
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if onionrproofs.hashMeetsDifficulty(i) and not comm_inst._core._blacklist.inBlacklist(i):
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if len(comm_inst.blockQueue) <= 1000000:
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comm_inst.blockQueue[i] = [peer] # add blocks to download queue
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else:
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if peer not in comm_inst.blockQueue[i]:
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if len(comm_inst.blockQueue[i]) < 10:
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comm_inst.blockQueue[i].append(peer)
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comm_inst.decrementThreadCount('lookupBlocks')
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return
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