326 lines
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326 lines
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<style>.flex{display:flex !important}body{line-height:1.5em}#content{padding:20px}#sidebar{padding:30px;overflow:hidden}.http-server-breadcrumbs{font-size:130%;margin:0 0 15px 0}#footer{font-size:.75em;padding:5px 30px;border-top:1px solid #ddd;text-align:right}#footer p{margin:0 0 0 1em;display:inline-block}#footer p:last-child{margin-right:30px}h1,h2,h3,h4,h5{font-weight:300}h1{font-size:2.5em;line-height:1.1em}h2{font-size:1.75em;margin:1em 0 .50em 0}h3{font-size:1.4em;margin:25px 0 10px 0}h4{margin:0;font-size:105%}a{color:#058;text-decoration:none;transition:color .3s ease-in-out}a:hover{color:#e82}.title code{font-weight:bold}h2[id^="header-"]{margin-top:2em}.ident{color:#900}pre code{background:#f8f8f8;font-size:.8em;line-height:1.4em}code{background:#f2f2f1;padding:1px 4px;overflow-wrap:break-word}h1 code{background:transparent}pre{background:#f8f8f8;border:0;border-top:1px solid #ccc;border-bottom:1px solid #ccc;margin:1em 0;padding:1ex}#http-server-module-list{display:flex;flex-flow:column}#http-server-module-list div{display:flex}#http-server-module-list dt{min-width:10%}#http-server-module-list p{margin-top:0}.toc ul,#index{list-style-type:none;margin:0;padding:0}#index code{background:transparent}#index h3{border-bottom:1px solid #ddd}#index ul{padding:0}#index h4{font-weight:bold}#index h4 + ul{margin-bottom:.6em}@media (min-width:200ex){#index .two-column{column-count:2}}@media (min-width:300ex){#index .two-column{column-count:3}}dl{margin-bottom:2em}dl dl:last-child{margin-bottom:4em}dd{margin:0 0 1em 3em}#header-classes + dl > dd{margin-bottom:3em}dd dd{margin-left:2em}dd p{margin:10px 0}.name{background:#eee;font-weight:bold;font-size:.85em;padding:5px 10px;display:inline-block;min-width:40%}.name:hover{background:#e0e0e0}.name > span:first-child{white-space:nowrap}.name.class > span:nth-child(2){margin-left:.4em}.inherited{color:#999;border-left:5px solid #eee;padding-left:1em}.inheritance em{font-style:normal;font-weight:bold}.desc h2{font-weight:400;font-size:1.25em}.desc h3{font-size:1em}.desc dt code{background:inherit}.source summary{color:#666;text-align:right;font-weight:400;font-size:.8em;text-transform:uppercase;cursor:pointer}.source pre{max-height:500px;overflow:auto;margin:0}.source pre code{font-size:12px;overflow:visible}.hlist{list-style:none}.hlist li{display:inline}.hlist li:after{content:',\2002'}.hlist li:last-child:after{content:none}.hlist .hlist{display:inline;padding-left:1em}img{max-width:100%}.admonition{padding:.1em .5em;margin-bottom:1em}.admonition-title{font-weight:bold}.admonition.note,.admonition.info,.admonition.important{background:#aef}.admonition.todo,.admonition.versionadded,.admonition.tip,.admonition.hint{background:#dfd}.admonition.warning,.admonition.versionchanged,.admonition.deprecated{background:#fd4}.admonition.error,.admonition.danger,.admonition.caution{background:lightpink}</style>
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<main>
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<article id="content">
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<header>
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<h1 class="title">Module <code>onionr.communicatorutils.downloadblocks</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>Download blocks using the communicator instance</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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Download blocks using the communicator instance
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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 communicator, onionrexceptions
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import logger, onionrpeers
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from onionrutils import blockmetadata, stringvalidators, validatemetadata
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from coredb import blockmetadb
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from . import shoulddownload
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from communicator import peeraction, onlinepeers
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import onionrcrypto, onionrstorage
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from onionrblocks import onionrblacklist, storagecounter
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def download_blocks_from_communicator(comm_inst):
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'''Use Onionr communicator instance to download blocks in the communicator's queue'''
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assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
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blacklist = onionrblacklist.OnionrBlackList()
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storage_counter = storagecounter.StorageCounter()
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LOG_SKIP_COUNT = 50 # for how many iterations we skip logging the counter
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count: int = 0
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metadata_validation_result: bool = False
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# Iterate the block queue in the communicator
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for blockHash in list(comm_inst.blockQueue):
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count += 1
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if len(comm_inst.onlinePeers) == 0:
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break
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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 not shoulddownload.should_download(comm_inst, blockHash):
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continue
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if comm_inst.shutdown or not comm_inst.isOnline or storage_counter.is_full():
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# 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:
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#logger.debug('Already downloading block %s...' % blockHash)
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continue
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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 = onlinepeers.pick_online_peer(comm_inst)
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else:
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blockPeers = onionrcrypto.cryptoutils.random_shuffle(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 = 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:
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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 = onionrcrypto.hashers.sha3_hash(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 = 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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try:
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metadata_validation_result = validatemetadata.validate_metadata(metadata, metas[2])
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except onionrexceptions.DataExists:
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metadata_validation_result = False
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if metadata_validation_result: # check if metadata is valid, and verify nonce
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if onionrcrypto.cryptoutils.verify_POW(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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onionrstorage.set_data(content)
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except onionrexceptions.DataExists:
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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
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else:
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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,))
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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:
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# if block didn't meet expected hash
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tempHash = onionrcrypto.hashers.sha3_hash(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).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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if count == LOG_SKIP_COUNT:
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logger.info('%s blocks remaining in queue' % [len(comm_inst.blockQueue)], terminal=True)
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count = 0
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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')</code></pre>
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</details>
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</section>
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<section>
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<h2 class="section-title" id="header-submodules">Sub-modules</h2>
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<dl>
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<dt><code class="name"><a title="onionr.communicatorutils.downloadblocks.shoulddownload" href="shoulddownload.html">onionr.communicatorutils.downloadblocks.shoulddownload</a></code></dt>
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<dd>
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<section class="desc"><p>Onionr - Private P2P Communication …</p></section>
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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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<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.downloadblocks.download_blocks_from_communicator"><code class="name flex">
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<span>def <span class="ident">download_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"><p>Use Onionr communicator instance to download blocks in the communicator's queue</p></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 download_blocks_from_communicator(comm_inst):
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'''Use Onionr communicator instance to download blocks in the communicator's queue'''
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assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
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blacklist = onionrblacklist.OnionrBlackList()
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storage_counter = storagecounter.StorageCounter()
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LOG_SKIP_COUNT = 50 # for how many iterations we skip logging the counter
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count: int = 0
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metadata_validation_result: bool = False
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# Iterate the block queue in the communicator
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for blockHash in list(comm_inst.blockQueue):
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count += 1
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if len(comm_inst.onlinePeers) == 0:
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break
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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 not shoulddownload.should_download(comm_inst, blockHash):
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continue
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if comm_inst.shutdown or not comm_inst.isOnline or storage_counter.is_full():
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# 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:
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#logger.debug('Already downloading block %s...' % blockHash)
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continue
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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 = onlinepeers.pick_online_peer(comm_inst)
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else:
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blockPeers = onionrcrypto.cryptoutils.random_shuffle(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 = 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:
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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 = onionrcrypto.hashers.sha3_hash(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 = 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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try:
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metadata_validation_result = validatemetadata.validate_metadata(metadata, metas[2])
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except onionrexceptions.DataExists:
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metadata_validation_result = False
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if metadata_validation_result: # check if metadata is valid, and verify nonce
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if onionrcrypto.cryptoutils.verify_POW(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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onionrstorage.set_data(content)
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except onionrexceptions.DataExists:
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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
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else:
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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,))
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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:
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# if block didn't meet expected hash
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tempHash = onionrcrypto.hashers.sha3_hash(content) # lazy hack, TODO use var
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try:
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||
|
|
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 comm_inst.blockQueue[blockHash] # remove from block queue both if success or false
|
||
|
|
if count == LOG_SKIP_COUNT:
|
||
|
|
logger.info('%s blocks remaining in queue' % [len(comm_inst.blockQueue)], terminal=True)
|
||
|
|
count = 0
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
comm_inst.currentDownloading.remove(blockHash)
|
||
|
|
comm_inst.decrementThreadCount('getBlocks')</code></pre>
|
||
|
|
</details>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
</section>
|
||
|
|
<section>
|
||
|
|
</section>
|
||
|
|
</article>
|
||
|
|
<nav id="sidebar">
|
||
|
|
<h1>Index</h1>
|
||
|
|
<div class="toc">
|
||
|
|
<ul></ul>
|
||
|
|
</div>
|
||
|
|
<ul id="index">
|
||
|
|
<li><h3>Super-module</h3>
|
||
|
|
<ul>
|
||
|
|
<li><code><a title="onionr.communicatorutils" href="../index.html">onionr.communicatorutils</a></code></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
<li><h3><a href="#header-submodules">Sub-modules</a></h3>
|
||
|
|
<ul>
|
||
|
|
<li><code><a title="onionr.communicatorutils.downloadblocks.shoulddownload" href="shoulddownload.html">onionr.communicatorutils.downloadblocks.shoulddownload</a></code></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
<li><h3><a href="#header-functions">Functions</a></h3>
|
||
|
|
<ul class="">
|
||
|
|
<li><code><a title="onionr.communicatorutils.downloadblocks.download_blocks_from_communicator" href="#onionr.communicatorutils.downloadblocks.download_blocks_from_communicator">download_blocks_from_communicator</a></code></li>
|
||
|
|
</ul>
|
||
|
|
</li>
|
||
|
|
</ul>
|
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|
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|
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