Handle corrupt wallets gracefully.
Corrupt wallets used to cause a DB_RUNRECOVERY uncaught exception and a
crash. This commit does three things:
1) Runs a BDB verify early in the startup process, and if there is a
low-level problem with the database:
+ Moves the bad wallet.dat to wallet.timestamp.bak
+ Runs a 'salvage' operation to get key/value pairs, and
writes them to a new wallet.dat
+ Continues with startup.
2) Much more tolerant of serialization errors. All errors in deserialization
are reported by tolerated EXCEPT for errors related to reading keypairs
or master key records-- those are reported and then shut down, so the user
can get help (or recover from a backup).
3) Adds a new -salvagewallet option, which:
+ Moves the wallet.dat to wallet.timestamp.bak
+ extracts ONLY keypairs and master keys into a new wallet.dat
+ soft-sets -rescan, to recreate transaction history
This was tested by randomly corrupting testnet wallets using a little
python script I wrote (https://gist.github.com/3812689)
This commit is contained in:
Gavin Andresen
508
src/walletdb.cpp
508
src/walletdb.cpp
@@ -108,7 +108,7 @@ void CWalletDB::ListAccountCreditDebit(const string& strAccount, list<CAccountin
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}
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int
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DBErrors
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CWalletDB::ReorderTransactions(CWallet* pwallet)
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{
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LOCK(pwallet->cs_wallet);
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@@ -181,16 +181,221 @@ CWalletDB::ReorderTransactions(CWallet* pwallet)
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}
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int CWalletDB::LoadWallet(CWallet* pwallet)
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bool
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ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
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int& nFileVersion, vector<uint256>& vWalletUpgrade,
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bool& fIsEncrypted, bool& fAnyUnordered, string& strType, string& strErr)
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{
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try {
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// Unserialize
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// Taking advantage of the fact that pair serialization
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// is just the two items serialized one after the other
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ssKey >> strType;
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if (strType == "name")
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{
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string strAddress;
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ssKey >> strAddress;
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ssValue >> pwallet->mapAddressBook[CBitcoinAddress(strAddress).Get()];
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}
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else if (strType == "tx")
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{
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uint256 hash;
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ssKey >> hash;
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CWalletTx& wtx = pwallet->mapWallet[hash];
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ssValue >> wtx;
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if (wtx.CheckTransaction() && (wtx.GetHash() == hash))
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wtx.BindWallet(pwallet);
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else
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{
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pwallet->mapWallet.erase(hash);
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return false;
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}
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// Undo serialize changes in 31600
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if (31404 <= wtx.fTimeReceivedIsTxTime && wtx.fTimeReceivedIsTxTime <= 31703)
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{
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if (!ssValue.empty())
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{
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char fTmp;
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char fUnused;
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ssValue >> fTmp >> fUnused >> wtx.strFromAccount;
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strErr = strprintf("LoadWallet() upgrading tx ver=%d %d '%s' %s",
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wtx.fTimeReceivedIsTxTime, fTmp, wtx.strFromAccount.c_str(), hash.ToString().c_str());
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wtx.fTimeReceivedIsTxTime = fTmp;
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}
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else
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{
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strErr = strprintf("LoadWallet() repairing tx ver=%d %s", wtx.fTimeReceivedIsTxTime, hash.ToString().c_str());
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wtx.fTimeReceivedIsTxTime = 0;
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}
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vWalletUpgrade.push_back(hash);
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}
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if (wtx.nOrderPos == -1)
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fAnyUnordered = true;
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//// debug print
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//printf("LoadWallet %s\n", wtx.GetHash().ToString().c_str());
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//printf(" %12"PRI64d" %s %s %s\n",
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// wtx.vout[0].nValue,
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// DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
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// wtx.hashBlock.ToString().substr(0,20).c_str(),
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// wtx.mapValue["message"].c_str());
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}
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else if (strType == "acentry")
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{
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string strAccount;
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ssKey >> strAccount;
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uint64 nNumber;
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ssKey >> nNumber;
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if (nNumber > nAccountingEntryNumber)
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nAccountingEntryNumber = nNumber;
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if (!fAnyUnordered)
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{
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CAccountingEntry acentry;
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ssValue >> acentry;
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if (acentry.nOrderPos == -1)
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fAnyUnordered = true;
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}
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}
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else if (strType == "key" || strType == "wkey")
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{
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vector<unsigned char> vchPubKey;
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ssKey >> vchPubKey;
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CKey key;
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if (strType == "key")
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{
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CPrivKey pkey;
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ssValue >> pkey;
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key.SetPubKey(vchPubKey);
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if (!key.SetPrivKey(pkey))
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{
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strErr = "Error reading wallet database: CPrivKey corrupt";
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return false;
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}
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if (key.GetPubKey() != vchPubKey)
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{
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strErr = "Error reading wallet database: CPrivKey pubkey inconsistency";
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return false;
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}
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if (!key.IsValid())
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{
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strErr = "Error reading wallet database: invalid CPrivKey";
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return false;
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}
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}
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else
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{
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CWalletKey wkey;
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ssValue >> wkey;
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key.SetPubKey(vchPubKey);
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if (!key.SetPrivKey(wkey.vchPrivKey))
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{
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strErr = "Error reading wallet database: CPrivKey corrupt";
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return false;
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}
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if (key.GetPubKey() != vchPubKey)
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{
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strErr = "Error reading wallet database: CWalletKey pubkey inconsistency";
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return false;
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}
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if (!key.IsValid())
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{
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strErr = "Error reading wallet database: invalid CWalletKey";
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return false;
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}
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}
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if (!pwallet->LoadKey(key))
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{
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strErr = "Error reading wallet database: LoadKey failed";
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return false;
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}
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}
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else if (strType == "mkey")
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{
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unsigned int nID;
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ssKey >> nID;
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CMasterKey kMasterKey;
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ssValue >> kMasterKey;
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if(pwallet->mapMasterKeys.count(nID) != 0)
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{
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strErr = strprintf("Error reading wallet database: duplicate CMasterKey id %u", nID);
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return false;
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}
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pwallet->mapMasterKeys[nID] = kMasterKey;
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if (pwallet->nMasterKeyMaxID < nID)
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pwallet->nMasterKeyMaxID = nID;
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}
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else if (strType == "ckey")
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{
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vector<unsigned char> vchPubKey;
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ssKey >> vchPubKey;
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vector<unsigned char> vchPrivKey;
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ssValue >> vchPrivKey;
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if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
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{
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strErr = "Error reading wallet database: LoadCryptedKey failed";
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return false;
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}
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fIsEncrypted = true;
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}
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else if (strType == "defaultkey")
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{
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ssValue >> pwallet->vchDefaultKey;
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}
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else if (strType == "pool")
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{
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int64 nIndex;
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ssKey >> nIndex;
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pwallet->setKeyPool.insert(nIndex);
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}
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else if (strType == "version")
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{
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ssValue >> nFileVersion;
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if (nFileVersion == 10300)
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nFileVersion = 300;
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}
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else if (strType == "cscript")
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{
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uint160 hash;
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ssKey >> hash;
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CScript script;
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ssValue >> script;
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if (!pwallet->LoadCScript(script))
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{
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strErr = "Error reading wallet database: LoadCScript failed";
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return false;
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}
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}
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else if (strType == "orderposnext")
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{
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ssValue >> pwallet->nOrderPosNext;
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}
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} catch (...)
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{
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return false;
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}
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return true;
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}
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static bool IsKeyType(string strType)
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{
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return (strType== "key" || strType == "wkey" ||
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strType == "mkey" || strType == "ckey");
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}
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DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
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{
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pwallet->vchDefaultKey = CPubKey();
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int nFileVersion = 0;
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vector<uint256> vWalletUpgrade;
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bool fIsEncrypted = false;
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bool fAnyUnordered = false;
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bool fNoncriticalErrors = false;
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DBErrors result = DB_LOAD_OK;
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//// todo: shouldn't we catch exceptions and try to recover and continue?
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{
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try {
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LOCK(pwallet->cs_wallet);
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int nMinVersion = 0;
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if (Read((string)"minversion", nMinVersion))
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@@ -222,189 +427,46 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
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return DB_CORRUPT;
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}
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// Unserialize
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// Taking advantage of the fact that pair serialization
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// is just the two items serialized one after the other
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string strType;
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ssKey >> strType;
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if (strType == "name")
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// Try to be tolerant of single corrupt records:
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string strType, strErr;
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if (!ReadKeyValue(pwallet, ssKey, ssValue, nFileVersion,
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vWalletUpgrade, fIsEncrypted, fAnyUnordered, strType, strErr))
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{
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string strAddress;
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ssKey >> strAddress;
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ssValue >> pwallet->mapAddressBook[CBitcoinAddress(strAddress).Get()];
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}
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else if (strType == "tx")
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{
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uint256 hash;
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ssKey >> hash;
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CWalletTx& wtx = pwallet->mapWallet[hash];
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ssValue >> wtx;
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wtx.BindWallet(pwallet);
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if (wtx.GetHash() != hash)
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printf("Error in wallet.dat, hash mismatch\n");
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// Undo serialize changes in 31600
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if (31404 <= wtx.fTimeReceivedIsTxTime && wtx.fTimeReceivedIsTxTime <= 31703)
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{
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if (!ssValue.empty())
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{
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char fTmp;
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char fUnused;
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ssValue >> fTmp >> fUnused >> wtx.strFromAccount;
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printf("LoadWallet() upgrading tx ver=%d %d '%s' %s\n", wtx.fTimeReceivedIsTxTime, fTmp, wtx.strFromAccount.c_str(), hash.ToString().c_str());
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wtx.fTimeReceivedIsTxTime = fTmp;
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}
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else
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{
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printf("LoadWallet() repairing tx ver=%d %s\n", wtx.fTimeReceivedIsTxTime, hash.ToString().c_str());
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wtx.fTimeReceivedIsTxTime = 0;
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}
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vWalletUpgrade.push_back(hash);
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}
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if (wtx.nOrderPos == -1)
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fAnyUnordered = true;
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//// debug print
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//printf("LoadWallet %s\n", wtx.GetHash().ToString().c_str());
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//printf(" %12"PRI64d" %s %s %s\n",
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// wtx.vout[0].nValue,
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// DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
|
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// wtx.hashBlock.ToString().substr(0,20).c_str(),
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// wtx.mapValue["message"].c_str());
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}
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else if (strType == "acentry")
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{
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string strAccount;
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ssKey >> strAccount;
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uint64 nNumber;
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ssKey >> nNumber;
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if (nNumber > nAccountingEntryNumber)
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nAccountingEntryNumber = nNumber;
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if (!fAnyUnordered)
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{
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CAccountingEntry acentry;
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ssValue >> acentry;
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if (acentry.nOrderPos == -1)
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fAnyUnordered = true;
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}
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}
|
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else if (strType == "key" || strType == "wkey")
|
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{
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vector<unsigned char> vchPubKey;
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ssKey >> vchPubKey;
|
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CKey key;
|
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if (strType == "key")
|
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{
|
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CPrivKey pkey;
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ssValue >> pkey;
|
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key.SetPubKey(vchPubKey);
|
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key.SetPrivKey(pkey);
|
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if (key.GetPubKey() != vchPubKey)
|
||||
{
|
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printf("Error reading wallet database: CPrivKey pubkey inconsistency\n");
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
if (!key.IsValid())
|
||||
{
|
||||
printf("Error reading wallet database: invalid CPrivKey\n");
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
}
|
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// losing keys is considered a catastrophic error, anything else
|
||||
// we assume the user can live with:
|
||||
if (IsKeyType(strType))
|
||||
result = DB_CORRUPT;
|
||||
else
|
||||
{
|
||||
CWalletKey wkey;
|
||||
ssValue >> wkey;
|
||||
key.SetPubKey(vchPubKey);
|
||||
key.SetPrivKey(wkey.vchPrivKey);
|
||||
if (key.GetPubKey() != vchPubKey)
|
||||
{
|
||||
printf("Error reading wallet database: CWalletKey pubkey inconsistency\n");
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
if (!key.IsValid())
|
||||
{
|
||||
printf("Error reading wallet database: invalid CWalletKey\n");
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
}
|
||||
if (!pwallet->LoadKey(key))
|
||||
{
|
||||
printf("Error reading wallet database: LoadKey failed\n");
|
||||
return DB_CORRUPT;
|
||||
// Leave other errors alone, if we try to fix them we might make things worse.
|
||||
fNoncriticalErrors = true; // ... but do warn the user there is something wrong.
|
||||
if (strType == "tx")
|
||||
// Rescan if there is a bad transaction record:
|
||||
SoftSetBoolArg("-rescan", true);
|
||||
}
|
||||
}
|
||||
else if (strType == "mkey")
|
||||
{
|
||||
unsigned int nID;
|
||||
ssKey >> nID;
|
||||
CMasterKey kMasterKey;
|
||||
ssValue >> kMasterKey;
|
||||
if(pwallet->mapMasterKeys.count(nID) != 0)
|
||||
{
|
||||
printf("Error reading wallet database: duplicate CMasterKey id %u\n", nID);
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
pwallet->mapMasterKeys[nID] = kMasterKey;
|
||||
if (pwallet->nMasterKeyMaxID < nID)
|
||||
pwallet->nMasterKeyMaxID = nID;
|
||||
}
|
||||
else if (strType == "ckey")
|
||||
{
|
||||
vector<unsigned char> vchPubKey;
|
||||
ssKey >> vchPubKey;
|
||||
vector<unsigned char> vchPrivKey;
|
||||
ssValue >> vchPrivKey;
|
||||
if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
|
||||
{
|
||||
printf("Error reading wallet database: LoadCryptedKey failed\n");
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
fIsEncrypted = true;
|
||||
}
|
||||
else if (strType == "defaultkey")
|
||||
{
|
||||
ssValue >> pwallet->vchDefaultKey;
|
||||
}
|
||||
else if (strType == "pool")
|
||||
{
|
||||
int64 nIndex;
|
||||
ssKey >> nIndex;
|
||||
pwallet->setKeyPool.insert(nIndex);
|
||||
}
|
||||
else if (strType == "version")
|
||||
{
|
||||
ssValue >> nFileVersion;
|
||||
if (nFileVersion == 10300)
|
||||
nFileVersion = 300;
|
||||
}
|
||||
else if (strType == "cscript")
|
||||
{
|
||||
uint160 hash;
|
||||
ssKey >> hash;
|
||||
CScript script;
|
||||
ssValue >> script;
|
||||
if (!pwallet->LoadCScript(script))
|
||||
{
|
||||
printf("Error reading wallet database: LoadCScript failed\n");
|
||||
return DB_CORRUPT;
|
||||
}
|
||||
}
|
||||
else if (strType == "orderposnext")
|
||||
{
|
||||
ssValue >> pwallet->nOrderPosNext;
|
||||
}
|
||||
if (!strErr.empty())
|
||||
printf("%s\n", strErr.c_str());
|
||||
}
|
||||
pcursor->close();
|
||||
}
|
||||
catch (...)
|
||||
{
|
||||
result = DB_CORRUPT;
|
||||
}
|
||||
|
||||
BOOST_FOREACH(uint256 hash, vWalletUpgrade)
|
||||
WriteTx(hash, pwallet->mapWallet[hash]);
|
||||
if (fNoncriticalErrors && result == DB_LOAD_OK)
|
||||
result = DB_NONCRITICAL_ERROR;
|
||||
|
||||
// Any wallet corruption at all: skip any rewriting or
|
||||
// upgrading, we don't want to make it worse.
|
||||
if (result != DB_LOAD_OK)
|
||||
return result;
|
||||
|
||||
printf("nFileVersion = %d\n", nFileVersion);
|
||||
|
||||
BOOST_FOREACH(uint256 hash, vWalletUpgrade)
|
||||
WriteTx(hash, pwallet->mapWallet[hash]);
|
||||
|
||||
// Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
|
||||
if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
|
||||
@@ -414,10 +476,9 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
|
||||
WriteVersion(CLIENT_VERSION);
|
||||
|
||||
if (fAnyUnordered)
|
||||
return ReorderTransactions(pwallet);
|
||||
result = ReorderTransactions(pwallet);
|
||||
|
||||
// If you add anything else here... be sure to do it if ReorderTransactions returns DB_LOAD_OK too!
|
||||
return DB_LOAD_OK;
|
||||
return result;
|
||||
}
|
||||
|
||||
void ThreadFlushWalletDB(void* parg)
|
||||
@@ -521,3 +582,94 @@ bool BackupWallet(const CWallet& wallet, const string& strDest)
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
//
|
||||
// Try to (very carefully!) recover wallet.dat if there is a problem.
|
||||
//
|
||||
bool CWalletDB::Recover(CDBEnv& dbenv, std::string filename, bool fOnlyKeys)
|
||||
{
|
||||
// Recovery procedure:
|
||||
// move wallet.dat to wallet.timestamp.bak
|
||||
// Call Salvage with fAggressive=true to
|
||||
// get as much data as possible.
|
||||
// Rewrite salvaged data to wallet.dat
|
||||
// Set -rescan so any missing transactions will be
|
||||
// found.
|
||||
int64 now = GetTime();
|
||||
std::string newFilename = strprintf("wallet.%"PRI64d".bak", now);
|
||||
|
||||
int result = dbenv.dbenv.dbrename(NULL, filename.c_str(), NULL,
|
||||
newFilename.c_str(), DB_AUTO_COMMIT);
|
||||
if (result == 0)
|
||||
printf("Renamed %s to %s\n", filename.c_str(), newFilename.c_str());
|
||||
else
|
||||
{
|
||||
printf("Failed to rename %s to %s\n", filename.c_str(), newFilename.c_str());
|
||||
return false;
|
||||
}
|
||||
|
||||
std::vector<CDBEnv::KeyValPair> salvagedData;
|
||||
bool allOK = dbenv.Salvage(newFilename, true, salvagedData);
|
||||
if (salvagedData.empty())
|
||||
{
|
||||
printf("Salvage(aggressive) found no records in %s.\n", newFilename.c_str());
|
||||
return false;
|
||||
}
|
||||
printf("Salvage(aggressive) found %"PRIszu" records\n", salvagedData.size());
|
||||
|
||||
bool fSuccess = allOK;
|
||||
Db* pdbCopy = new Db(&dbenv.dbenv, 0);
|
||||
int ret = pdbCopy->open(NULL, // Txn pointer
|
||||
filename.c_str(), // Filename
|
||||
"main", // Logical db name
|
||||
DB_BTREE, // Database type
|
||||
DB_CREATE, // Flags
|
||||
0);
|
||||
if (ret > 0)
|
||||
{
|
||||
printf("Cannot create database file %s\n", filename.c_str());
|
||||
return false;
|
||||
}
|
||||
CWallet dummyWallet;
|
||||
int nFileVersion = 0;
|
||||
vector<uint256> vWalletUpgrade;
|
||||
bool fIsEncrypted = false;
|
||||
bool fAnyUnordered = false;
|
||||
|
||||
DbTxn* ptxn = dbenv.TxnBegin();
|
||||
BOOST_FOREACH(CDBEnv::KeyValPair& row, salvagedData)
|
||||
{
|
||||
if (fOnlyKeys)
|
||||
{
|
||||
CDataStream ssKey(row.first, SER_DISK, CLIENT_VERSION);
|
||||
CDataStream ssValue(row.second, SER_DISK, CLIENT_VERSION);
|
||||
string strType, strErr;
|
||||
bool fReadOK = ReadKeyValue(&dummyWallet, ssKey, ssValue,
|
||||
nFileVersion, vWalletUpgrade,
|
||||
fIsEncrypted, fAnyUnordered,
|
||||
strType, strErr);
|
||||
if (!IsKeyType(strType))
|
||||
continue;
|
||||
if (!fReadOK)
|
||||
{
|
||||
printf("WARNING: CWalletDB::Recover skipping %s: %s\n", strType.c_str(), strErr.c_str());
|
||||
continue;
|
||||
}
|
||||
}
|
||||
Dbt datKey(&row.first[0], row.first.size());
|
||||
Dbt datValue(&row.second[0], row.second.size());
|
||||
int ret2 = pdbCopy->put(ptxn, &datKey, &datValue, DB_NOOVERWRITE);
|
||||
if (ret2 > 0)
|
||||
fSuccess = false;
|
||||
}
|
||||
ptxn->commit(0);
|
||||
pdbCopy->close(0);
|
||||
delete pdbCopy;
|
||||
|
||||
return fSuccess;
|
||||
}
|
||||
|
||||
bool CWalletDB::Recover(CDBEnv& dbenv, std::string filename)
|
||||
{
|
||||
return CWalletDB::Recover(dbenv, filename, false);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user