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511 lines
13 KiB
C++
511 lines
13 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2012 The Bitcoin developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file license.txt or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_DB_H
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#define BITCOIN_DB_H
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#include "key.h"
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#include <map>
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#include <string>
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#include <vector>
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#include <db_cxx.h>
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class CAccount;
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class CAccountingEntry;
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class CAddress;
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class CAddrMan;
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class CBlockLocator;
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class CDiskBlockIndex;
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class CDiskTxPos;
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class CMasterKey;
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class COutPoint;
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class CTxIndex;
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class CWallet;
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class CWalletTx;
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extern unsigned int nWalletDBUpdated;
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extern DbEnv dbenv;
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extern void DBFlush(bool fShutdown);
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void ThreadFlushWalletDB(void* parg);
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bool BackupWallet(const CWallet& wallet, const std::string& strDest);
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/** RAII class that provides access to a Berkeley database */
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class CDB
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{
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protected:
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Db* pdb;
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std::string strFile;
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std::vector<DbTxn*> vTxn;
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bool fReadOnly;
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explicit CDB(const char* pszFile, const char* pszMode="r+");
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~CDB() { Close(); }
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public:
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void Close();
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private:
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CDB(const CDB&);
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void operator=(const CDB&);
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protected:
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template<typename K, typename T>
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bool Read(const K& key, T& value)
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{
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if (!pdb)
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return false;
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// Key
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CDataStream ssKey(SER_DISK);
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ssKey.reserve(1000);
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ssKey << key;
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Dbt datKey(&ssKey[0], ssKey.size());
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// Read
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Dbt datValue;
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datValue.set_flags(DB_DBT_MALLOC);
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int ret = pdb->get(GetTxn(), &datKey, &datValue, 0);
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memset(datKey.get_data(), 0, datKey.get_size());
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if (datValue.get_data() == NULL)
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return false;
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// Unserialize value
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CDataStream ssValue((char*)datValue.get_data(), (char*)datValue.get_data() + datValue.get_size(), SER_DISK);
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ssValue >> value;
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// Clear and free memory
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memset(datValue.get_data(), 0, datValue.get_size());
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free(datValue.get_data());
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return (ret == 0);
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}
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template<typename K, typename T>
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bool Write(const K& key, const T& value, bool fOverwrite=true)
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{
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if (!pdb)
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return false;
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if (fReadOnly)
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assert(!"Write called on database in read-only mode");
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// Key
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CDataStream ssKey(SER_DISK);
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ssKey.reserve(1000);
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ssKey << key;
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Dbt datKey(&ssKey[0], ssKey.size());
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// Value
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CDataStream ssValue(SER_DISK);
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ssValue.reserve(10000);
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ssValue << value;
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Dbt datValue(&ssValue[0], ssValue.size());
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// Write
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int ret = pdb->put(GetTxn(), &datKey, &datValue, (fOverwrite ? 0 : DB_NOOVERWRITE));
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// Clear memory in case it was a private key
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memset(datKey.get_data(), 0, datKey.get_size());
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memset(datValue.get_data(), 0, datValue.get_size());
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return (ret == 0);
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}
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template<typename K>
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bool Erase(const K& key)
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{
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if (!pdb)
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return false;
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if (fReadOnly)
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assert(!"Erase called on database in read-only mode");
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// Key
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CDataStream ssKey(SER_DISK);
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ssKey.reserve(1000);
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ssKey << key;
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Dbt datKey(&ssKey[0], ssKey.size());
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// Erase
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int ret = pdb->del(GetTxn(), &datKey, 0);
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// Clear memory
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memset(datKey.get_data(), 0, datKey.get_size());
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return (ret == 0 || ret == DB_NOTFOUND);
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}
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template<typename K>
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bool Exists(const K& key)
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{
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if (!pdb)
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return false;
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// Key
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CDataStream ssKey(SER_DISK);
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ssKey.reserve(1000);
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ssKey << key;
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Dbt datKey(&ssKey[0], ssKey.size());
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// Exists
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int ret = pdb->exists(GetTxn(), &datKey, 0);
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// Clear memory
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memset(datKey.get_data(), 0, datKey.get_size());
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return (ret == 0);
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}
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Dbc* GetCursor()
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{
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if (!pdb)
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return NULL;
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Dbc* pcursor = NULL;
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int ret = pdb->cursor(NULL, &pcursor, 0);
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if (ret != 0)
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return NULL;
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return pcursor;
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}
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int ReadAtCursor(Dbc* pcursor, CDataStream& ssKey, CDataStream& ssValue, unsigned int fFlags=DB_NEXT)
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{
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// Read at cursor
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Dbt datKey;
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if (fFlags == DB_SET || fFlags == DB_SET_RANGE || fFlags == DB_GET_BOTH || fFlags == DB_GET_BOTH_RANGE)
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{
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datKey.set_data(&ssKey[0]);
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datKey.set_size(ssKey.size());
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}
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Dbt datValue;
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if (fFlags == DB_GET_BOTH || fFlags == DB_GET_BOTH_RANGE)
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{
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datValue.set_data(&ssValue[0]);
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datValue.set_size(ssValue.size());
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}
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datKey.set_flags(DB_DBT_MALLOC);
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datValue.set_flags(DB_DBT_MALLOC);
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int ret = pcursor->get(&datKey, &datValue, fFlags);
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if (ret != 0)
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return ret;
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else if (datKey.get_data() == NULL || datValue.get_data() == NULL)
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return 99999;
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// Convert to streams
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ssKey.SetType(SER_DISK);
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ssKey.clear();
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ssKey.write((char*)datKey.get_data(), datKey.get_size());
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ssValue.SetType(SER_DISK);
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ssValue.clear();
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ssValue.write((char*)datValue.get_data(), datValue.get_size());
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// Clear and free memory
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memset(datKey.get_data(), 0, datKey.get_size());
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memset(datValue.get_data(), 0, datValue.get_size());
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free(datKey.get_data());
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free(datValue.get_data());
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return 0;
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}
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DbTxn* GetTxn()
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{
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if (!vTxn.empty())
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return vTxn.back();
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else
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return NULL;
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}
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public:
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bool TxnBegin()
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{
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if (!pdb)
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return false;
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DbTxn* ptxn = NULL;
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int ret = dbenv.txn_begin(GetTxn(), &ptxn, DB_TXN_NOSYNC);
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if (!ptxn || ret != 0)
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return false;
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vTxn.push_back(ptxn);
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return true;
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}
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bool TxnCommit()
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{
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if (!pdb)
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return false;
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if (vTxn.empty())
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return false;
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int ret = vTxn.back()->commit(0);
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vTxn.pop_back();
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return (ret == 0);
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}
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bool TxnAbort()
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{
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if (!pdb)
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return false;
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if (vTxn.empty())
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return false;
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int ret = vTxn.back()->abort();
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vTxn.pop_back();
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return (ret == 0);
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}
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bool ReadVersion(int& nVersion)
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{
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nVersion = 0;
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return Read(std::string("version"), nVersion);
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}
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bool WriteVersion(int nVersion)
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{
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return Write(std::string("version"), nVersion);
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}
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bool static Rewrite(const std::string& strFile, const char* pszSkip = NULL);
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};
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/** Access to the transaction database (blkindex.dat) */
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class CTxDB : public CDB
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{
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public:
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CTxDB(const char* pszMode="r+") : CDB("blkindex.dat", pszMode) { }
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private:
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CTxDB(const CTxDB&);
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void operator=(const CTxDB&);
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public:
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bool ReadTxIndex(uint256 hash, CTxIndex& txindex);
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bool UpdateTxIndex(uint256 hash, const CTxIndex& txindex);
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bool AddTxIndex(const CTransaction& tx, const CDiskTxPos& pos, int nHeight);
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bool EraseTxIndex(const CTransaction& tx);
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bool ContainsTx(uint256 hash);
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bool ReadOwnerTxes(uint160 hash160, int nHeight, std::vector<CTransaction>& vtx);
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bool ReadDiskTx(uint256 hash, CTransaction& tx, CTxIndex& txindex);
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bool ReadDiskTx(uint256 hash, CTransaction& tx);
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bool ReadDiskTx(COutPoint outpoint, CTransaction& tx, CTxIndex& txindex);
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bool ReadDiskTx(COutPoint outpoint, CTransaction& tx);
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bool WriteBlockIndex(const CDiskBlockIndex& blockindex);
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bool EraseBlockIndex(uint256 hash);
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bool ReadHashBestChain(uint256& hashBestChain);
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bool WriteHashBestChain(uint256 hashBestChain);
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bool ReadBestInvalidWork(CBigNum& bnBestInvalidWork);
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bool WriteBestInvalidWork(CBigNum bnBestInvalidWork);
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bool LoadBlockIndex();
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};
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/** Access to the (IP) address database (addr.dat) */
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class CAddrDB : public CDB
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{
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public:
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CAddrDB(const char* pszMode="r+") : CDB("addr.dat", pszMode) { }
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private:
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CAddrDB(const CAddrDB&);
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void operator=(const CAddrDB&);
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public:
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bool WriteAddrman(const CAddrMan& addr);
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bool LoadAddresses();
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};
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bool LoadAddresses();
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/** A key pool entry */
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class CKeyPool
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{
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public:
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int64 nTime;
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std::vector<unsigned char> vchPubKey;
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CKeyPool()
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{
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nTime = GetTime();
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}
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CKeyPool(const std::vector<unsigned char>& vchPubKeyIn)
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{
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nTime = GetTime();
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vchPubKey = vchPubKeyIn;
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}
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IMPLEMENT_SERIALIZE
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(
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if (!(nType & SER_GETHASH))
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READWRITE(nVersion);
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READWRITE(nTime);
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READWRITE(vchPubKey);
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)
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};
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/** Error statuses for the wallet database */
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enum DBErrors
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{
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DB_LOAD_OK,
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DB_CORRUPT,
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DB_TOO_NEW,
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DB_LOAD_FAIL,
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DB_NEED_REWRITE
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};
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/** Access to the wallet database (wallet.dat) */
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class CWalletDB : public CDB
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{
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public:
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CWalletDB(std::string strFilename, const char* pszMode="r+") : CDB(strFilename.c_str(), pszMode)
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{
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}
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private:
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CWalletDB(const CWalletDB&);
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void operator=(const CWalletDB&);
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public:
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bool ReadName(const std::string& strAddress, std::string& strName)
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{
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strName = "";
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return Read(std::make_pair(std::string("name"), strAddress), strName);
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}
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bool WriteName(const std::string& strAddress, const std::string& strName);
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bool EraseName(const std::string& strAddress);
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bool ReadTx(uint256 hash, CWalletTx& wtx)
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{
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return Read(std::make_pair(std::string("tx"), hash), wtx);
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}
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bool WriteTx(uint256 hash, const CWalletTx& wtx)
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{
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nWalletDBUpdated++;
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return Write(std::make_pair(std::string("tx"), hash), wtx);
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}
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bool EraseTx(uint256 hash)
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{
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nWalletDBUpdated++;
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return Erase(std::make_pair(std::string("tx"), hash));
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}
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bool ReadKey(const std::vector<unsigned char>& vchPubKey, CPrivKey& vchPrivKey)
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{
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vchPrivKey.clear();
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return Read(std::make_pair(std::string("key"), vchPubKey), vchPrivKey);
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}
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bool WriteKey(const std::vector<unsigned char>& vchPubKey, const CPrivKey& vchPrivKey)
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{
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nWalletDBUpdated++;
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return Write(std::make_pair(std::string("key"), vchPubKey), vchPrivKey, false);
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}
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bool WriteCryptedKey(const std::vector<unsigned char>& vchPubKey, const std::vector<unsigned char>& vchCryptedSecret, bool fEraseUnencryptedKey = true)
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{
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nWalletDBUpdated++;
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if (!Write(std::make_pair(std::string("ckey"), vchPubKey), vchCryptedSecret, false))
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return false;
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if (fEraseUnencryptedKey)
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{
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Erase(std::make_pair(std::string("key"), vchPubKey));
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Erase(std::make_pair(std::string("wkey"), vchPubKey));
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}
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return true;
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}
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bool WriteMasterKey(unsigned int nID, const CMasterKey& kMasterKey)
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{
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nWalletDBUpdated++;
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return Write(std::make_pair(std::string("mkey"), nID), kMasterKey, true);
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}
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// Support for BIP 0013 : see https://en.bitcoin.it/wiki/BIP_0013
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bool ReadCScript(const uint160 &hash, CScript& redeemScript)
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{
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redeemScript.clear();
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return Read(std::make_pair(std::string("cscript"), hash), redeemScript);
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}
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bool WriteCScript(const uint160& hash, const CScript& redeemScript)
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{
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nWalletDBUpdated++;
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return Write(std::make_pair(std::string("cscript"), hash), redeemScript, false);
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}
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bool WriteBestBlock(const CBlockLocator& locator)
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{
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nWalletDBUpdated++;
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return Write(std::string("bestblock"), locator);
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}
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bool ReadBestBlock(CBlockLocator& locator)
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{
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return Read(std::string("bestblock"), locator);
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}
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bool ReadDefaultKey(std::vector<unsigned char>& vchPubKey)
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{
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vchPubKey.clear();
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return Read(std::string("defaultkey"), vchPubKey);
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}
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bool WriteDefaultKey(const std::vector<unsigned char>& vchPubKey)
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{
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nWalletDBUpdated++;
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return Write(std::string("defaultkey"), vchPubKey);
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}
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bool ReadPool(int64 nPool, CKeyPool& keypool)
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{
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return Read(std::make_pair(std::string("pool"), nPool), keypool);
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}
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bool WritePool(int64 nPool, const CKeyPool& keypool)
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{
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nWalletDBUpdated++;
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return Write(std::make_pair(std::string("pool"), nPool), keypool);
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}
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bool ErasePool(int64 nPool)
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{
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nWalletDBUpdated++;
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return Erase(std::make_pair(std::string("pool"), nPool));
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}
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// Settings are no longer stored in wallet.dat; these are
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// used only for backwards compatibility:
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template<typename T>
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bool ReadSetting(const std::string& strKey, T& value)
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{
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return Read(std::make_pair(std::string("setting"), strKey), value);
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}
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template<typename T>
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bool WriteSetting(const std::string& strKey, const T& value)
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{
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nWalletDBUpdated++;
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return Write(std::make_pair(std::string("setting"), strKey), value);
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}
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bool EraseSetting(const std::string& strKey)
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{
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nWalletDBUpdated++;
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return Erase(std::make_pair(std::string("setting"), strKey));
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}
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bool WriteMinVersion(int nVersion)
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{
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return Write(std::string("minversion"), nVersion);
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}
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bool ReadAccount(const std::string& strAccount, CAccount& account);
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bool WriteAccount(const std::string& strAccount, const CAccount& account);
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bool WriteAccountingEntry(const CAccountingEntry& acentry);
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int64 GetAccountCreditDebit(const std::string& strAccount);
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void ListAccountCreditDebit(const std::string& strAccount, std::list<CAccountingEntry>& acentries);
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int LoadWallet(CWallet* pwallet);
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};
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#endif
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