79 lines
3.9 KiB
Python
79 lines
3.9 KiB
Python
'''
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Onionr - P2P Microblogging Platform & Social network
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Lookup new blocks with the communicator using a random connected peer
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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 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 |