mirror of https://github.com/qortal/qortal
CalDescent
3 years ago
2 changed files with 0 additions and 164 deletions
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package org.qortal.block; |
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import java.io.InputStream; |
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import java.util.List; |
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import java.util.stream.Collectors; |
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import javax.xml.bind.JAXBContext; |
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import javax.xml.bind.JAXBException; |
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import javax.xml.bind.UnmarshalException; |
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import javax.xml.bind.Unmarshaller; |
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import javax.xml.transform.stream.StreamSource; |
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import org.apache.logging.log4j.LogManager; |
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import org.apache.logging.log4j.Logger; |
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import org.eclipse.persistence.jaxb.JAXBContextFactory; |
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import org.eclipse.persistence.jaxb.UnmarshallerProperties; |
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import org.qortal.data.account.AccountBalanceData; |
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import org.qortal.repository.DataException; |
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/** |
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* Block 212937 |
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* <p> |
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* Somehow a node minted a version of block 212937 that contained one transaction: |
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* a PAYMENT transaction that attempted to spend more QORT than that account had as QORT balance. |
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* <p> |
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* This invalid transaction made block 212937 (rightly) invalid to several nodes, |
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* which refused to use that block. |
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* However, it seems there were no other nodes minting an alternative, valid block at that time |
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* and so the chain stalled for several nodes in the network. |
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* <p> |
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* Additionally, the invalid block 212937 affected all new installations, regardless of whether |
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* they synchronized from scratch (block 1) or used an 'official release' bootstrap. |
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* <p> |
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* After lengthy diagnosis, it was discovered that |
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* the invalid transaction seemed to rely on incorrect balances in a corrupted database. |
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* Copies of DB files containing the broken chain were also shared around, exacerbating the problem. |
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* <p> |
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* There were three options: |
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* <ol> |
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* <li>roll back the chain to last known valid block 212936 and re-mint empty blocks to current height</li> |
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* <li>keep existing chain, but apply database edits at block 212937 to allow current chain to be valid</li> |
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* <li>attempt to mint an alternative chain, retaining as many valid transactions as possible</li> |
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* </ol> |
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* <p> |
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* Option 1 was highly undesirable due to knock-on effects from wiping 700+ transactions, some of which |
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* might have affect cross-chain trades, although there were no cross-chain trade completed during |
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* the decision period. |
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* <p> |
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* Option 3 was essentially a slightly better version of option 1 and rejected for similar reasons. |
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* Attempts at option 3 also rapidly hit cumulative problems with every replacement block due to |
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* differing block timestamps making some transactions, and then even some blocks themselves, invalid. |
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* <p> |
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* This class is the implementation of option 2. |
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* <p> |
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* The change in account balances are relatively small, see <tt>block-212937-deltas.json</tt> resource |
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* for actual values. These values were obtained by exporting the <tt>AccountBalances</tt> table from |
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* both versions of the database with chain at block 212936, and then comparing. The values were also |
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* tested by syncing both databases up to block 225500, re-exporting and re-comparing. |
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* <p> |
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* The invalid block 212937 signature is: <tt>2J3GVJjv...qavh6KkQ</tt>. |
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* <p> |
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* The invalid transaction in block 212937 is: |
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* <p> |
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* <code><pre> |
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{ |
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"amount" : "0.10788294", |
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"approvalStatus" : "NOT_REQUIRED", |
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"blockHeight" : 212937, |
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"creatorAddress" : "QLdw5uabviLJgRGkRiydAFmAtZzxHfNXSs", |
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"fee" : "0.00100000", |
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"recipient" : "QZi1mNHDbiLvsytxTgxDr9nhJe4pNZaWpw", |
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"reference" : "J6JukdTVuXZ3JYbHatfZzwxG2vSiZwVCPDzW5K7PsVQKRj8XZeDtqnkGCGGjaSQZ9bQMtV44ky88NnGM4YBQKU6", |
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"senderPublicKey" : "DBFfbD2M3uh4jPE5PaUcZVvNPfrrJzVB7seeEtBn5SPs", |
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"signature" : "qkitxdCEEnKt8w6wRfFixtErbXsxWE6zG2ESNhpqBdScikV1WxeA6WZTTMJVV4tCeZdBFXw3V1X5NVztv6LirWK", |
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"timestamp" : 1607863074904, |
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"txGroupId" : 0, |
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"type" : "PAYMENT" |
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} |
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</pre></code> |
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* <p> |
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* Account <tt>QLdw5uabviLJgRGkRiydAFmAtZzxHfNXSs</tt> attempted to spend <tt>0.10888294</tt> (including fees) |
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* when their QORT balance was really only <tt>0.10886665</tt>. |
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* <p> |
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* However, on the broken DB nodes, their balance |
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* seemed to be <tt>0.10890293</tt> which was sufficient to make the transaction valid. |
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*/ |
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public final class Block212937 { |
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private static final Logger LOGGER = LogManager.getLogger(Block212937.class); |
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private static final String ACCOUNT_DELTAS_SOURCE = "block-212937-deltas.json"; |
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private static final List<AccountBalanceData> accountDeltas = readAccountDeltas(); |
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private Block212937() { |
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/* Do not instantiate */ |
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} |
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@SuppressWarnings("unchecked") |
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private static List<AccountBalanceData> readAccountDeltas() { |
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Unmarshaller unmarshaller; |
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try { |
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// Create JAXB context aware of classes we need to unmarshal
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JAXBContext jc = JAXBContextFactory.createContext(new Class[] { |
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AccountBalanceData.class |
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}, null); |
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// Create unmarshaller
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unmarshaller = jc.createUnmarshaller(); |
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// Set the unmarshaller media type to JSON
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unmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, "application/json"); |
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// Tell unmarshaller that there's no JSON root element in the JSON input
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unmarshaller.setProperty(UnmarshallerProperties.JSON_INCLUDE_ROOT, false); |
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} catch (JAXBException e) { |
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String message = "Failed to setup unmarshaller to read block 212937 deltas"; |
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LOGGER.error(message, e); |
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throw new RuntimeException(message, e); |
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} |
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ClassLoader classLoader = BlockChain.class.getClassLoader(); |
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InputStream in = classLoader.getResourceAsStream(ACCOUNT_DELTAS_SOURCE); |
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StreamSource jsonSource = new StreamSource(in); |
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try { |
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// Attempt to unmarshal JSON stream to BlockChain config
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return (List<AccountBalanceData>) unmarshaller.unmarshal(jsonSource, AccountBalanceData.class).getValue(); |
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} catch (UnmarshalException e) { |
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String message = "Failed to parse block 212937 deltas"; |
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LOGGER.error(message, e); |
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throw new RuntimeException(message, e); |
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} catch (JAXBException e) { |
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String message = "Unexpected JAXB issue while processing block 212937 deltas"; |
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LOGGER.error(message, e); |
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throw new RuntimeException(message, e); |
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} |
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} |
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public static void processFix(Block block) throws DataException { |
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block.repository.getAccountRepository().modifyAssetBalances(accountDeltas); |
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} |
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public static void orphanFix(Block block) throws DataException { |
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// Create inverse deltas
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List<AccountBalanceData> inverseDeltas = accountDeltas.stream() |
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.map(delta -> new AccountBalanceData(delta.getAddress(), delta.getAssetId(), 0 - delta.getBalance())) |
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.collect(Collectors.toList()); |
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block.repository.getAccountRepository().modifyAssetBalances(inverseDeltas); |
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} |
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} |
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