311 lines
8.2 KiB
C++
311 lines
8.2 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING 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 "clientversion.h"
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#include "serialize.h"
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#include "streams.h"
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#include "sync.h"
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#include "version.h"
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#include <map>
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#include <string>
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#include <vector>
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#include <boost/filesystem/path.hpp>
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#include <db_cxx.h>
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class CDiskBlockIndex;
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class COutPoint;
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extern unsigned int nWalletDBUpdated;
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void ThreadFlushWalletDB(const std::string& strWalletFile);
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class CDBEnv
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{
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private:
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bool fDbEnvInit;
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bool fMockDb;
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boost::filesystem::path path;
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void EnvShutdown();
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public:
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mutable CCriticalSection cs_db;
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DbEnv dbenv;
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std::map<std::string, int> mapFileUseCount;
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std::map<std::string, Db*> mapDb;
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CDBEnv();
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~CDBEnv();
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void MakeMock();
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bool IsMock() { return fMockDb; }
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/**
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* Verify that database file strFile is OK. If it is not,
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* call the callback to try to recover.
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* This must be called BEFORE strFile is opened.
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* Returns true if strFile is OK.
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*/
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enum VerifyResult { VERIFY_OK,
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RECOVER_OK,
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RECOVER_FAIL };
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VerifyResult Verify(std::string strFile, bool (*recoverFunc)(CDBEnv& dbenv, std::string strFile));
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/**
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* Salvage data from a file that Verify says is bad.
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* fAggressive sets the DB_AGGRESSIVE flag (see berkeley DB->verify() method documentation).
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* Appends binary key/value pairs to vResult, returns true if successful.
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* NOTE: reads the entire database into memory, so cannot be used
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* for huge databases.
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*/
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typedef std::pair<std::vector<unsigned char>, std::vector<unsigned char> > KeyValPair;
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bool Salvage(std::string strFile, bool fAggressive, std::vector<KeyValPair>& vResult);
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bool Open(const boost::filesystem::path& path);
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void Close();
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void Flush(bool fShutdown);
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void CheckpointLSN(const std::string& strFile);
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void CloseDb(const std::string& strFile);
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bool RemoveDb(const std::string& strFile);
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DbTxn* TxnBegin(int flags = DB_TXN_WRITE_NOSYNC)
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{
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DbTxn* ptxn = NULL;
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int ret = dbenv.txn_begin(NULL, &ptxn, flags);
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if (!ptxn || ret != 0)
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return NULL;
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return ptxn;
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}
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};
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extern CDBEnv bitdb;
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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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DbTxn* activeTxn;
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bool fReadOnly;
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bool fFlushOnClose;
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explicit CDB(const std::string& strFilename, const char* pszMode = "r+", bool fFlushOnCloseIn=true);
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~CDB() { Close(); }
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public:
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void Flush();
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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, CLIENT_VERSION);
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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(activeTxn, &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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try {
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CDataStream ssValue((char*)datValue.get_data(), (char*)datValue.get_data() + datValue.get_size(), SER_DISK, CLIENT_VERSION);
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ssValue >> value;
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} catch (const std::exception&) {
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return false;
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}
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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, CLIENT_VERSION);
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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, CLIENT_VERSION);
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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(activeTxn, &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, CLIENT_VERSION);
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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(activeTxn, &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, CLIENT_VERSION);
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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(activeTxn, &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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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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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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public:
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bool TxnBegin()
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{
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if (!pdb || activeTxn)
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return false;
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DbTxn* ptxn = bitdb.TxnBegin();
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if (!ptxn)
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return false;
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activeTxn = 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 || !activeTxn)
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return false;
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int ret = activeTxn->commit(0);
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activeTxn = NULL;
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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 || !activeTxn)
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return false;
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int ret = activeTxn->abort();
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activeTxn = NULL;
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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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#endif // BITCOIN_DB_H
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