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<article id="content">
<header>
<h1 class="title">Module <code>onionr.communicatorutils.downloadblocks</code></h1>
</header>
<section id="section-intro">
<p>Onionr - Private P2P Communication</p>
<p>Download blocks using the communicator instance</p>
<details class="source">
<summary>Source code</summary>
<pre><code class="python">&#39;&#39;&#39;
Onionr - Private P2P Communication
Download blocks using the communicator instance
&#39;&#39;&#39;
&#39;&#39;&#39;
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see &lt;https://www.gnu.org/licenses/&gt;.
&#39;&#39;&#39;
import communicator, onionrexceptions
import logger, onionrpeers
from onionrutils import blockmetadata, stringvalidators, validatemetadata
from coredb import blockmetadb
from . import shoulddownload
from communicator import peeraction, onlinepeers
import onionrcrypto, onionrstorage
from onionrblocks import onionrblacklist, storagecounter
def download_blocks_from_communicator(comm_inst):
&#39;&#39;&#39;Use Onionr communicator instance to download blocks in the communicator&#39;s queue&#39;&#39;&#39;
assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
blacklist = onionrblacklist.OnionrBlackList()
storage_counter = storagecounter.StorageCounter()
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(comm_inst.blockQueue):
count += 1
if len(comm_inst.onlinePeers) == 0:
break
triedQueuePeers = [] # List of peers we&#39;ve tried for a block
try:
blockPeers = list(comm_inst.blockQueue[blockHash])
except KeyError:
blockPeers = []
removeFromQueue = True
if not shoulddownload.should_download(comm_inst, blockHash):
continue
if comm_inst.shutdown or not comm_inst.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 comm_inst.currentDownloading:
#logger.debug(&#39;Already downloading block %s...&#39; % blockHash)
continue
comm_inst.currentDownloading.append(blockHash) # So we can avoid concurrent downloading in other threads of same block
if len(blockPeers) == 0:
peerUsed = onlinepeers.pick_online_peer(comm_inst)
else:
blockPeers = onionrcrypto.cryptoutils.random_shuffle(blockPeers)
peerUsed = blockPeers.pop(0)
if not comm_inst.shutdown and peerUsed.strip() != &#39;&#39;:
logger.info(&#34;Attempting to download %s from %s...&#34; % (blockHash[:12], peerUsed))
content = peeraction.peer_action(comm_inst, peerUsed, &#39;getdata/&#39; + blockHash, max_resp_size=3000000) # block content from random peer (includes metadata)
if content != False and len(content) &gt; 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(&#39;Attempting to save block %s...&#39; % blockHash[:12])
try:
onionrstorage.set_data(content)
except onionrexceptions.DataExists:
logger.warn(&#39;Data is already set for %s &#39; % (blockHash,))
except onionrexceptions.DiskAllocationReached:
logger.error(&#39;Reached disk allocation allowance, cannot save block %s.&#39; % (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
else:
logger.warn(&#39;POW failed for block %s.&#39; % (blockHash,))
else:
if blacklist.inBlacklist(realHash):
logger.warn(&#39;Block %s is blacklisted.&#39; % (realHash,))
else:
logger.warn(&#39;Metadata for block %s is invalid.&#39; % (blockHash,))
blacklist.addToDB(blockHash)
else:
# if block didn&#39;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 != &#39;ed55e34cb828232d6c14da0479709bfa10a0923dca2b380496e6b2ed4f7a0253&#39;:
# Dumb hack for 404 response from peer. Don&#39;t log it if 404 since its likely not malicious or a critical error.
logger.warn(&#39;Block hash validation failed for &#39; + blockHash + &#39; got &#39; + tempHash)
else:
removeFromQueue = False # Don&#39;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(&#39;%s blocks remaining in queue&#39; % [len(comm_inst.blockQueue)], terminal=True)
count = 0
except KeyError:
pass
comm_inst.currentDownloading.remove(blockHash)
comm_inst.decrementThreadCount(&#39;getBlocks&#39;)</code></pre>
</details>
</section>
<section>
<h2 class="section-title" id="header-submodules">Sub-modules</h2>
<dl>
<dt><code class="name"><a title="onionr.communicatorutils.downloadblocks.shoulddownload" href="shoulddownload.html">onionr.communicatorutils.downloadblocks.shoulddownload</a></code></dt>
<dd>
<section class="desc"><p>Onionr - Private P2P Communication …</p></section>
</dd>
</dl>
</section>
<section>
</section>
<section>
<h2 class="section-title" id="header-functions">Functions</h2>
<dl>
<dt id="onionr.communicatorutils.downloadblocks.download_blocks_from_communicator"><code class="name flex">
<span>def <span class="ident">download_blocks_from_communicator</span></span>(<span>comm_inst)</span>
</code></dt>
<dd>
<section class="desc"><p>Use Onionr communicator instance to download blocks in the communicator's queue</p></section>
<details class="source">
<summary>Source code</summary>
<pre><code class="python">def download_blocks_from_communicator(comm_inst):
&#39;&#39;&#39;Use Onionr communicator instance to download blocks in the communicator&#39;s queue&#39;&#39;&#39;
assert isinstance(comm_inst, communicator.OnionrCommunicatorDaemon)
blacklist = onionrblacklist.OnionrBlackList()
storage_counter = storagecounter.StorageCounter()
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(comm_inst.blockQueue):
count += 1
if len(comm_inst.onlinePeers) == 0:
break
triedQueuePeers = [] # List of peers we&#39;ve tried for a block
try:
blockPeers = list(comm_inst.blockQueue[blockHash])
except KeyError:
blockPeers = []
removeFromQueue = True
if not shoulddownload.should_download(comm_inst, blockHash):
continue
if comm_inst.shutdown or not comm_inst.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 comm_inst.currentDownloading:
#logger.debug(&#39;Already downloading block %s...&#39; % blockHash)
continue
comm_inst.currentDownloading.append(blockHash) # So we can avoid concurrent downloading in other threads of same block
if len(blockPeers) == 0:
peerUsed = onlinepeers.pick_online_peer(comm_inst)
else:
blockPeers = onionrcrypto.cryptoutils.random_shuffle(blockPeers)
peerUsed = blockPeers.pop(0)
if not comm_inst.shutdown and peerUsed.strip() != &#39;&#39;:
logger.info(&#34;Attempting to download %s from %s...&#34; % (blockHash[:12], peerUsed))
content = peeraction.peer_action(comm_inst, peerUsed, &#39;getdata/&#39; + blockHash, max_resp_size=3000000) # block content from random peer (includes metadata)
if content != False and len(content) &gt; 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(&#39;Attempting to save block %s...&#39; % blockHash[:12])
try:
onionrstorage.set_data(content)
except onionrexceptions.DataExists:
logger.warn(&#39;Data is already set for %s &#39; % (blockHash,))
except onionrexceptions.DiskAllocationReached:
logger.error(&#39;Reached disk allocation allowance, cannot save block %s.&#39; % (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
else:
logger.warn(&#39;POW failed for block %s.&#39; % (blockHash,))
else:
if blacklist.inBlacklist(realHash):
logger.warn(&#39;Block %s is blacklisted.&#39; % (realHash,))
else:
logger.warn(&#39;Metadata for block %s is invalid.&#39; % (blockHash,))
blacklist.addToDB(blockHash)
else:
# if block didn&#39;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 != &#39;ed55e34cb828232d6c14da0479709bfa10a0923dca2b380496e6b2ed4f7a0253&#39;:
# Dumb hack for 404 response from peer. Don&#39;t log it if 404 since its likely not malicious or a critical error.
logger.warn(&#39;Block hash validation failed for &#39; + blockHash + &#39; got &#39; + tempHash)
else:
removeFromQueue = False # Don&#39;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(&#39;%s blocks remaining in queue&#39; % [len(comm_inst.blockQueue)], terminal=True)
count = 0
except KeyError:
pass
comm_inst.currentDownloading.remove(blockHash)
comm_inst.decrementThreadCount(&#39;getBlocks&#39;)</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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