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<style media="print">@media print{#sidebar h1{page-break-before:always}.source{display:none}}@media print{*{background:transparent !important;color:#000 !important;box-shadow:none !important;text-shadow:none !important}a[href]:after{content:" (" attr(href) ")";font-size:90%}a[href][title]:after{content:none}abbr[title]:after{content:" (" attr(title) ")"}.ir a:after,a[href^="javascript:"]:after,a[href^="#"]:after{content:""}pre,blockquote{border:1px solid #999;page-break-inside:avoid}thead{display:table-header-group}tr,img{page-break-inside:avoid}img{max-width:100% !important}@page{margin:0.5cm}p,h2,h3{orphans:3;widows:3}h1,h2,h3,h4,h5,h6{page-break-after:avoid}}</style>
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<article id="content">
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<header>
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<h1 class="title">Module <code>onionr.communicatorutils.lookupblocks</code></h1>
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</header>
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<section id="section-intro">
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<p>Onionr - Private P2P Communication</p>
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<p>Lookup new blocks with the communicator using a random connected peer</p>
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<details class="source">
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<summary>Source code</summary>
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<pre><code class="python">'''
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Onionr - Private P2P Communication
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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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from onionrutils import stringvalidators, epoch
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from communicator import peeraction, onlinepeers
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from coredb import blockmetadb
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from utils import reconstructhash
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from onionrblocks import onionrblacklist
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blacklist = onionrblacklist.OnionrBlackList()
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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 = blockmetadb.get_block_list() # List of existing saved blocks
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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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new_block_count = 0
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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.storage_counter.is_full():
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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 = onlinepeers.pick_online_peer(comm_inst) # 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 = peeraction.peer_action(comm_inst, 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] = epoch.get_rounded_epoch(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 stringvalidators.validate_hash(i):
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i = reconstructhash.reconstruct_hash(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 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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new_block_count += 1
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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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if new_block_count > 0:
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block_string = ""
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if new_block_count > 1:
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block_string = "s"
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logger.info('Discovered %s new block%s' % (new_block_count, block_string), terminal=True)
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comm_inst.download_blocks_timer.count = int(comm_inst.download_blocks_timer.frequency * 0.99)
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comm_inst.decrementThreadCount('lookup_blocks_from_communicator')
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return</code></pre>
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</details>
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</section>
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<section>
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</section>
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<section>
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</section>
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<section>
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<h2 class="section-title" id="header-functions">Functions</h2>
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<dl>
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<dt id="onionr.communicatorutils.lookupblocks.lookup_blocks_from_communicator"><code class="name flex">
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<span>def <span class="ident">lookup_blocks_from_communicator</span></span>(<span>comm_inst)</span>
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</code></dt>
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<dd>
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<section class="desc"></section>
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<details class="source">
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<summary>Source code</summary>
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<pre><code class="python">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 = blockmetadb.get_block_list() # List of existing saved blocks
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triedPeers = [] # list of peers we've tried this time around
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|
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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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new_block_count = 0
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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.storage_counter.is_full():
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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 = onlinepeers.pick_online_peer(comm_inst) # 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 = peeraction.peer_action(comm_inst, 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] = epoch.get_rounded_epoch(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 stringvalidators.validate_hash(i):
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i = reconstructhash.reconstruct_hash(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 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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new_block_count += 1
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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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if new_block_count > 0:
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block_string = ""
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if new_block_count > 1:
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block_string = "s"
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logger.info('Discovered %s new block%s' % (new_block_count, block_string), terminal=True)
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comm_inst.download_blocks_timer.count = int(comm_inst.download_blocks_timer.frequency * 0.99)
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comm_inst.decrementThreadCount('lookup_blocks_from_communicator')
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return</code></pre>
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</details>
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</dd>
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</dl>
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</section>
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<section>
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</section>
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</article>
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<nav id="sidebar">
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<h1>Index</h1>
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<div class="toc">
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<ul></ul>
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</div>
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<ul id="index">
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<li><h3>Super-module</h3>
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<ul>
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<li><code><a title="onionr.communicatorutils" href="index.html">onionr.communicatorutils</a></code></li>
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</ul>
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</li>
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<li><h3><a href="#header-functions">Functions</a></h3>
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<ul class="">
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<li><code><a title="onionr.communicatorutils.lookupblocks.lookup_blocks_from_communicator" href="#onionr.communicatorutils.lookupblocks.lookup_blocks_from_communicator">lookup_blocks_from_communicator</a></code></li>
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</ul>
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</li>
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