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bitcoin/db.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
#include "headers.h"
void ThreadFlushWalletDB(void* parg);
unsigned int nWalletDBUpdated;
//
// CDB
//
static CCriticalSection cs_db;
static bool fDbEnvInit = false;
DbEnv dbenv(0);
static map<string, int> mapFileUseCount;
static map<string, Db*> mapDb;
class CDBInit
{
public:
CDBInit()
{
}
~CDBInit()
{
if (fDbEnvInit)
{
dbenv.close(0);
fDbEnvInit = false;
}
}
}
instance_of_cdbinit;
CDB::CDB(const char* pszFile, const char* pszMode) : pdb(NULL)
{
int ret;
if (pszFile == NULL)
return;
fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
bool fCreate = strchr(pszMode, 'c');
unsigned int nFlags = DB_THREAD;
if (fCreate)
nFlags |= DB_CREATE;
CRITICAL_BLOCK(cs_db)
{
if (!fDbEnvInit)
{
if (fShutdown)
return;
string strDataDir = GetDataDir();
string strLogDir = strDataDir + "/database";
filesystem::create_directory(strLogDir.c_str());
string strErrorFile = strDataDir + "/db.log";
printf("dbenv.open strLogDir=%s strErrorFile=%s\n", strLogDir.c_str(), strErrorFile.c_str());
dbenv.set_lg_dir(strLogDir.c_str());
dbenv.set_lg_max(10000000);
dbenv.set_lk_max_locks(10000);
dbenv.set_lk_max_objects(10000);
dbenv.set_errfile(fopen(strErrorFile.c_str(), "a")); /// debug
dbenv.set_flags(DB_AUTO_COMMIT, 1);
ret = dbenv.open(strDataDir.c_str(),
DB_CREATE |
DB_INIT_LOCK |
DB_INIT_LOG |
DB_INIT_MPOOL |
DB_INIT_TXN |
DB_THREAD |
DB_PRIVATE |
DB_RECOVER,
S_IRUSR | S_IWUSR);
if (ret > 0)
throw runtime_error(strprintf("CDB() : error %d opening database environment", ret));
fDbEnvInit = true;
}
strFile = pszFile;
++mapFileUseCount[strFile];
pdb = mapDb[strFile];
if (pdb == NULL)
{
pdb = new Db(&dbenv, 0);
ret = pdb->open(NULL, // Txn pointer
pszFile, // Filename
"main", // Logical db name
DB_BTREE, // Database type
nFlags, // Flags
0);
if (ret > 0)
{
delete pdb;
pdb = NULL;
CRITICAL_BLOCK(cs_db)
--mapFileUseCount[strFile];
strFile = "";
throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
}
if (fCreate && !Exists(string("version")))
{
bool fTmp = fReadOnly;
fReadOnly = false;
WriteVersion(VERSION);
fReadOnly = fTmp;
}
mapDb[strFile] = pdb;
}
}
}
void CDB::Close()
{
if (!pdb)
return;
if (!vTxn.empty())
vTxn.front()->abort();
vTxn.clear();
pdb = NULL;
// Flush database activity from memory pool to disk log
unsigned int nMinutes = 0;
if (strFile == "addr.dat")
nMinutes = 2;
if (strFile == "blkindex.dat" && IsInitialBlockDownload() && nBestHeight % 500 != 0)
nMinutes = 1;
dbenv.txn_checkpoint(0, nMinutes, 0);
CRITICAL_BLOCK(cs_db)
--mapFileUseCount[strFile];
}
void CloseDb(const string& strFile)
{
CRITICAL_BLOCK(cs_db)
{
if (mapDb[strFile] != NULL)
{
// Close the database handle
Db* pdb = mapDb[strFile];
pdb->close(0);
delete pdb;
mapDb[strFile] = NULL;
}
}
}
void DBFlush(bool fShutdown)
{
// Flush log data to the actual data file
// on all files that are not in use
printf("DBFlush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
if (!fDbEnvInit)
return;
CRITICAL_BLOCK(cs_db)
{
map<string, int>::iterator mi = mapFileUseCount.begin();
while (mi != mapFileUseCount.end())
{
string strFile = (*mi).first;
int nRefCount = (*mi).second;
printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
if (nRefCount == 0)
{
// Move log data to the dat file
CloseDb(strFile);
dbenv.txn_checkpoint(0, 0, 0);
printf("%s flush\n", strFile.c_str());
dbenv.lsn_reset(strFile.c_str(), 0);
mapFileUseCount.erase(mi++);
}
else
mi++;
}
if (fShutdown)
{
char** listp;
if (mapFileUseCount.empty())
dbenv.log_archive(&listp, DB_ARCH_REMOVE);
dbenv.close(0);
fDbEnvInit = false;
}
}
}
//
// CTxDB
//
bool CTxDB::ReadTxIndex(uint256 hash, CTxIndex& txindex)
{
assert(!fClient);
txindex.SetNull();
return Read(make_pair(string("tx"), hash), txindex);
}
bool CTxDB::UpdateTxIndex(uint256 hash, const CTxIndex& txindex)
{
assert(!fClient);
return Write(make_pair(string("tx"), hash), txindex);
}
bool CTxDB::AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight)
{
assert(!fClient);
// Add to tx index
uint256 hash = tx.GetHash();
CTxIndex txindex(pos, tx.vout.size());
return Write(make_pair(string("tx"), hash), txindex);
}
bool CTxDB::EraseTxIndex(const CTransaction& tx)
{
assert(!fClient);
uint256 hash = tx.GetHash();
return Erase(make_pair(string("tx"), hash));
}
bool CTxDB::ContainsTx(uint256 hash)
{
assert(!fClient);
return Exists(make_pair(string("tx"), hash));
}
bool CTxDB::ReadOwnerTxes(uint160 hash160, int nMinHeight, vector<CTransaction>& vtx)
{
assert(!fClient);
vtx.clear();
// Get cursor
Dbc* pcursor = GetCursor();
if (!pcursor)
return false;
unsigned int fFlags = DB_SET_RANGE;
loop
{
// Read next record
CDataStream ssKey;
if (fFlags == DB_SET_RANGE)
ssKey << string("owner") << hash160 << CDiskTxPos(0, 0, 0);
CDataStream ssValue;
int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
fFlags = DB_NEXT;
if (ret == DB_NOTFOUND)
break;
else if (ret != 0)
{
pcursor->close();
return false;
}
// Unserialize
string strType;
uint160 hashItem;
CDiskTxPos pos;
ssKey >> strType >> hashItem >> pos;
int nItemHeight;
ssValue >> nItemHeight;
// Read transaction
if (strType != "owner" || hashItem != hash160)
break;
if (nItemHeight >= nMinHeight)
{
vtx.resize(vtx.size()+1);
if (!vtx.back().ReadFromDisk(pos))
{
pcursor->close();
return false;
}
}
}
pcursor->close();
return true;
}
bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex)
{
assert(!fClient);
tx.SetNull();
if (!ReadTxIndex(hash, txindex))
return false;
return (tx.ReadFromDisk(txindex.pos));
}
bool CTxDB::ReadDiskTx(uint256 hash, CTransaction& tx)
{
CTxIndex txindex;
return ReadDiskTx(hash, tx, txindex);
}
bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex)
{
return ReadDiskTx(outpoint.hash, tx, txindex);
}
bool CTxDB::ReadDiskTx(COutPoint outpoint, CTransaction& tx)
{
CTxIndex txindex;
return ReadDiskTx(outpoint.hash, tx, txindex);
}
bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
{
return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
}
bool CTxDB::EraseBlockIndex(uint256 hash)
{
return Erase(make_pair(string("blockindex"), hash));
}
bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
{
return Read(string("hashBestChain"), hashBestChain);
}
bool CTxDB::WriteHashBestChain(uint256 hashBestChain)
{
return Write(string("hashBestChain"), hashBestChain);
}
bool CTxDB::ReadBestInvalidWork(CBigNum& bnBestInvalidWork)
{
return Read(string("bnBestInvalidWork"), bnBestInvalidWork);
}
bool CTxDB::WriteBestInvalidWork(CBigNum bnBestInvalidWork)
{
return Write(string("bnBestInvalidWork"), bnBestInvalidWork);
}
CBlockIndex* InsertBlockIndex(uint256 hash)
{
if (hash == 0)
return NULL;
// Return existing
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
if (mi != mapBlockIndex.end())
return (*mi).second;
// Create new
CBlockIndex* pindexNew = new CBlockIndex();
if (!pindexNew)
throw runtime_error("LoadBlockIndex() : new CBlockIndex failed");
mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
return pindexNew;
}
bool CTxDB::LoadBlockIndex()
{
// Get database cursor
Dbc* pcursor = GetCursor();
if (!pcursor)
return false;
// Load mapBlockIndex
unsigned int fFlags = DB_SET_RANGE;
loop
{
// Read next record
CDataStream ssKey;
if (fFlags == DB_SET_RANGE)
ssKey << make_pair(string("blockindex"), uint256(0));
CDataStream ssValue;
int ret = ReadAtCursor(pcursor, ssKey, ssValue, fFlags);
fFlags = DB_NEXT;
if (ret == DB_NOTFOUND)
break;
else if (ret != 0)
return false;
// Unserialize
string strType;
ssKey >> strType;
if (strType == "blockindex")
{
CDiskBlockIndex diskindex;
ssValue >> diskindex;
// Construct block index object
CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
pindexNew->pprev = InsertBlockIndex(diskindex.hashPrev);
pindexNew->pnext = InsertBlockIndex(diskindex.hashNext);
pindexNew->nFile = diskindex.nFile;
pindexNew->nBlockPos = diskindex.nBlockPos;
pindexNew->nHeight = diskindex.nHeight;
pindexNew->nVersion = diskindex.nVersion;
pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
pindexNew->nTime = diskindex.nTime;
pindexNew->nBits = diskindex.nBits;
pindexNew->nNonce = diskindex.nNonce;
// Watch for genesis block
if (pindexGenesisBlock == NULL && diskindex.GetBlockHash() == hashGenesisBlock)
pindexGenesisBlock = pindexNew;
if (!pindexNew->CheckIndex())
return error("LoadBlockIndex() : CheckIndex failed at %d", pindexNew->nHeight);
}
else
{
break;
}
}
pcursor->close();
// Calculate bnChainWork
vector<pair<int, CBlockIndex*> > vSortedByHeight;
vSortedByHeight.reserve(mapBlockIndex.size());
foreach(const PAIRTYPE(uint256, CBlockIndex*)& item, mapBlockIndex)
{
CBlockIndex* pindex = item.second;
vSortedByHeight.push_back(make_pair(pindex->nHeight, pindex));
}
sort(vSortedByHeight.begin(), vSortedByHeight.end());
foreach(const PAIRTYPE(int, CBlockIndex*)& item, vSortedByHeight)
{
CBlockIndex* pindex = item.second;
pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
}
// Load hashBestChain pointer to end of best chain
if (!ReadHashBestChain(hashBestChain))
{
if (pindexGenesisBlock == NULL)
return true;
return error("CTxDB::LoadBlockIndex() : hashBestChain not loaded");
}
if (!mapBlockIndex.count(hashBestChain))
return error("CTxDB::LoadBlockIndex() : hashBestChain not found in the block index");
pindexBest = mapBlockIndex[hashBestChain];
nBestHeight = pindexBest->nHeight;
bnBestChainWork = pindexBest->bnChainWork;
printf("LoadBlockIndex(): hashBestChain=%s height=%d\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight);
// Load bnBestInvalidWork, OK if it doesn't exist
ReadBestInvalidWork(bnBestInvalidWork);
// Verify blocks in the best chain
CBlockIndex* pindexFork = NULL;
for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
{
if (pindex->nHeight < 74000 && !mapArgs.count("-checkblocks"))
break;
CBlock block;
if (!block.ReadFromDisk(pindex))
return error("LoadBlockIndex() : block.ReadFromDisk failed");
if (!block.CheckBlock())
{
printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
pindexFork = pindex->pprev;
}
}
if (pindexFork)
{
// Reorg back to the fork
printf("LoadBlockIndex() : *** moving best chain pointer back to block %d\n", pindexFork->nHeight);
CBlock block;
if (!block.ReadFromDisk(pindexFork))
return error("LoadBlockIndex() : block.ReadFromDisk failed");
CTxDB txdb;
block.SetBestChain(txdb, pindexFork);
}
return true;
}
//
// CAddrDB
//
bool CAddrDB::WriteAddress(const CAddress& addr)
{
return Write(make_pair(string("addr"), addr.GetKey()), addr);
}
bool CAddrDB::LoadAddresses()
{
CRITICAL_BLOCK(cs_mapAddresses)
{
// Load user provided addresses
CAutoFile filein = fopen((GetDataDir() + "/addr.txt").c_str(), "rt");
if (filein)
{
try
{
char psz[1000];
while (fgets(psz, sizeof(psz), filein))
{
CAddress addr(psz, NODE_NETWORK);
addr.nTime = 0; // so it won't relay unless successfully connected
if (addr.IsValid())
AddAddress(addr);
}
}
catch (...) { }
}
// Get cursor
Dbc* pcursor = GetCursor();
if (!pcursor)
return false;
loop
{
// Read next record
CDataStream ssKey;
CDataStream ssValue;
int ret = ReadAtCursor(pcursor, ssKey, ssValue);
if (ret == DB_NOTFOUND)
break;
else if (ret != 0)
return false;
// Unserialize
string strType;
ssKey >> strType;
if (strType == "addr")
{
CAddress addr;
ssValue >> addr;
mapAddresses.insert(make_pair(addr.GetKey(), addr));
}
}
pcursor->close();
printf("Loaded %d addresses\n", mapAddresses.size());
// Fix for possible bug that manifests in mapAddresses.count in irc.cpp,
// just need to call count here and it doesn't happen there. The bug was the
// pack pragma in irc.cpp and has been fixed, but I'm not in a hurry to delete this.
mapAddresses.count(vector<unsigned char>(18));
}
return true;
}
bool LoadAddresses()
{
return CAddrDB("cr+").LoadAddresses();
}
//
// CWalletDB
//
bool CWalletDB::LoadWallet()
{
vchDefaultKey.clear();
int nFileVersion = 0;
// Modify defaults
#ifndef __WXMSW__
// Tray icon sometimes disappears on 9.10 karmic koala 64-bit, leaving no way to access the program
fMinimizeToTray = false;
fMinimizeOnClose = false;
#endif
//// todo: shouldn't we catch exceptions and try to recover and continue?
CRITICAL_BLOCK(cs_mapKeys)
CRITICAL_BLOCK(cs_mapWallet)
{
// Get cursor
Dbc* pcursor = GetCursor();
if (!pcursor)
return false;
loop
{
// Read next record
CDataStream ssKey;
CDataStream ssValue;
int ret = ReadAtCursor(pcursor, ssKey, ssValue);
if (ret == DB_NOTFOUND)
break;
else if (ret != 0)
return false;
// Unserialize
// Taking advantage of the fact that pair serialization
// is just the two items serialized one after the other
string strType;
ssKey >> strType;
if (strType == "name")
{
string strAddress;
ssKey >> strAddress;
ssValue >> mapAddressBook[strAddress];
}
else if (strType == "tx")
{
uint256 hash;
ssKey >> hash;
CWalletTx& wtx = mapWallet[hash];
ssValue >> wtx;
if (wtx.GetHash() != hash)
printf("Error in wallet.dat, hash mismatch\n");
//// debug print
//printf("LoadWallet %s\n", wtx.GetHash().ToString().c_str());
//printf(" %12I64d %s %s %s\n",
// wtx.vout[0].nValue,
// DateTimeStrFormat("%x %H:%M:%S", wtx.GetBlockTime()).c_str(),
// wtx.hashBlock.ToString().substr(0,20).c_str(),
// wtx.mapValue["message"].c_str());
}
else if (strType == "key" || strType == "wkey")
{
vector<unsigned char> vchPubKey;
ssKey >> vchPubKey;
CWalletKey wkey;
if (strType == "key")
ssValue >> wkey.vchPrivKey;
else
ssValue >> wkey;
mapKeys[vchPubKey] = wkey.vchPrivKey;
mapPubKeys[Hash160(vchPubKey)] = vchPubKey;
}
else if (strType == "defaultkey")
{
ssValue >> vchDefaultKey;
}
else if (strType == "version")
{
ssValue >> nFileVersion;
if (nFileVersion == 10300)
nFileVersion = 300;
}
else if (strType == "setting")
{
string strKey;
ssKey >> strKey;
// Menu state
if (strKey == "fGenerateBitcoins") ssValue >> fGenerateBitcoins;
// Options
if (strKey == "nTransactionFee") ssValue >> nTransactionFee;
if (strKey == "addrIncoming") ssValue >> addrIncoming;
if (strKey == "fLimitProcessors") ssValue >> fLimitProcessors;
if (strKey == "nLimitProcessors") ssValue >> nLimitProcessors;
if (strKey == "fMinimizeToTray") ssValue >> fMinimizeToTray;
if (strKey == "fMinimizeOnClose") ssValue >> fMinimizeOnClose;
if (strKey == "fUseProxy") ssValue >> fUseProxy;
if (strKey == "addrProxy") ssValue >> addrProxy;
}
}
pcursor->close();
}
printf("nFileVersion = %d\n", nFileVersion);
printf("fGenerateBitcoins = %d\n", fGenerateBitcoins);
printf("nTransactionFee = %"PRI64d"\n", nTransactionFee);
printf("addrIncoming = %s\n", addrIncoming.ToString().c_str());
printf("fMinimizeToTray = %d\n", fMinimizeToTray);
printf("fMinimizeOnClose = %d\n", fMinimizeOnClose);
printf("fUseProxy = %d\n", fUseProxy);
printf("addrProxy = %s\n", addrProxy.ToString().c_str());
// The transaction fee setting won't be needed for many years to come.
// Setting it to zero here in case they set it to something in an earlier version.
if (nTransactionFee != 0)
{
nTransactionFee = 0;
WriteSetting("nTransactionFee", nTransactionFee);
}
// Upgrade
if (nFileVersion < VERSION)
{
// Get rid of old debug.log file in current directory
if (nFileVersion <= 105 && !pszSetDataDir[0])
unlink("debug.log");
WriteVersion(VERSION);
}
return true;
}
bool LoadWallet(bool& fFirstRunRet)
{
fFirstRunRet = false;
if (!CWalletDB("cr+").LoadWallet())
return false;
fFirstRunRet = vchDefaultKey.empty();
if (mapKeys.count(vchDefaultKey))
{
// Set keyUser
keyUser.SetPubKey(vchDefaultKey);
keyUser.SetPrivKey(mapKeys[vchDefaultKey]);
}
else
{
// Create new keyUser and set as default key
RandAddSeedPerfmon();
keyUser.MakeNewKey();
if (!AddKey(keyUser))
return false;
if (!SetAddressBookName(PubKeyToAddress(keyUser.GetPubKey()), "Your Address"))
return false;
CWalletDB().WriteDefaultKey(keyUser.GetPubKey());
}
CreateThread(ThreadFlushWalletDB, NULL);
return true;
}
void ThreadFlushWalletDB(void* parg)
{
static bool fOneThread;
if (fOneThread)
return;
fOneThread = true;
if (mapArgs.count("-noflushwallet"))
return;
unsigned int nLastSeen = nWalletDBUpdated;
unsigned int nLastFlushed = nWalletDBUpdated;
int64 nLastWalletUpdate = GetTime();
while (!fShutdown)
{
Sleep(500);
if (nLastSeen != nWalletDBUpdated)
{
nLastSeen = nWalletDBUpdated;
nLastWalletUpdate = GetTime();
}
if (nLastFlushed != nWalletDBUpdated && GetTime() - nLastWalletUpdate >= 2)
{
TRY_CRITICAL_BLOCK(cs_db)
{
// Don't do this if any databases are in use
int nRefCount = 0;
map<string, int>::iterator mi = mapFileUseCount.begin();
while (mi != mapFileUseCount.end())
{
nRefCount += (*mi).second;
mi++;
}
if (nRefCount == 0 && !fShutdown)
{
string strFile = "wallet.dat";
map<string, int>::iterator mi = mapFileUseCount.find(strFile);
if (mi != mapFileUseCount.end())
{
printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
printf("Flushing wallet.dat\n");
nLastFlushed = nWalletDBUpdated;
int64 nStart = GetTimeMillis();
// Flush wallet.dat so it's self contained
CloseDb(strFile);
dbenv.txn_checkpoint(0, 0, 0);
dbenv.lsn_reset(strFile.c_str(), 0);
mapFileUseCount.erase(mi++);
printf("Flushed wallet.dat %"PRI64d"ms\n", GetTimeMillis() - nStart);
}
}
}
}
}
}
void BackupWallet(const string& strDest)
{
while (!fShutdown)
{
CRITICAL_BLOCK(cs_db)
{
const string strFile = "wallet.dat";
if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
{
// Flush log data to the dat file
CloseDb(strFile);
dbenv.txn_checkpoint(0, 0, 0);
dbenv.lsn_reset(strFile.c_str(), 0);
mapFileUseCount.erase(strFile);
// Copy wallet.dat
filesystem::path pathSrc(GetDataDir() + "/" + strFile);
filesystem::path pathDest(strDest);
if (filesystem::is_directory(pathDest))
pathDest = pathDest / strFile;
#if BOOST_VERSION >= 104000
filesystem::copy_file(pathSrc, pathDest, filesystem::copy_option::overwrite_if_exists);
#else
filesystem::copy_file(pathSrc, pathDest);
#endif
printf("copied wallet.dat to %s\n", pathDest.string().c_str());
return;
}
}
Sleep(100);
}
}
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