455 lines
14 KiB
C++
455 lines
14 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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#include "db.h"
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#include "addrman.h"
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#include "hash.h"
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#include "protocol.h"
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#include "util.h"
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#include "utilstrencodings.h"
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#include <stdint.h>
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#ifndef WIN32
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#include <sys/stat.h>
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#endif
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#include <boost/filesystem.hpp>
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#include <boost/thread.hpp>
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#include <boost/version.hpp>
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#include <openssl/rand.h>
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using namespace std;
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unsigned int nWalletDBUpdated;
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//
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// CDB
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//
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CDBEnv bitdb;
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void CDBEnv::EnvShutdown()
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{
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if (!fDbEnvInit)
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return;
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fDbEnvInit = false;
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int ret = dbenv.close(0);
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if (ret != 0)
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LogPrintf("CDBEnv::EnvShutdown: Error %d shutting down database environment: %s\n", ret, DbEnv::strerror(ret));
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if (!fMockDb)
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DbEnv(0).remove(path.string().c_str(), 0);
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}
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CDBEnv::CDBEnv() : dbenv(DB_CXX_NO_EXCEPTIONS)
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{
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fDbEnvInit = false;
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fMockDb = false;
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}
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CDBEnv::~CDBEnv()
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{
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EnvShutdown();
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}
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void CDBEnv::Close()
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{
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EnvShutdown();
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}
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bool CDBEnv::Open(const boost::filesystem::path& pathIn)
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{
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if (fDbEnvInit)
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return true;
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boost::this_thread::interruption_point();
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path = pathIn;
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boost::filesystem::path pathLogDir = path / "database";
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TryCreateDirectory(pathLogDir);
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boost::filesystem::path pathErrorFile = path / "db.log";
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LogPrintf("CDBEnv::Open: LogDir=%s ErrorFile=%s\n", pathLogDir.string(), pathErrorFile.string());
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unsigned int nEnvFlags = 0;
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if (GetBoolArg("-privdb", true))
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nEnvFlags |= DB_PRIVATE;
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dbenv.set_lg_dir(pathLogDir.string().c_str());
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dbenv.set_cachesize(0, 0x100000, 1); // 1 MiB should be enough for just the wallet
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dbenv.set_lg_bsize(0x10000);
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dbenv.set_lg_max(1048576);
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dbenv.set_lk_max_locks(40000);
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dbenv.set_lk_max_objects(40000);
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dbenv.set_errfile(fopen(pathErrorFile.string().c_str(), "a")); /// debug
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dbenv.set_flags(DB_AUTO_COMMIT, 1);
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dbenv.set_flags(DB_TXN_WRITE_NOSYNC, 1);
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dbenv.log_set_config(DB_LOG_AUTO_REMOVE, 1);
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int ret = dbenv.open(path.string().c_str(),
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DB_CREATE |
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DB_INIT_LOCK |
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DB_INIT_LOG |
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DB_INIT_MPOOL |
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DB_INIT_TXN |
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DB_THREAD |
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DB_RECOVER |
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nEnvFlags,
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S_IRUSR | S_IWUSR);
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if (ret != 0)
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return error("CDBEnv::Open: Error %d opening database environment: %s\n", ret, DbEnv::strerror(ret));
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fDbEnvInit = true;
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fMockDb = false;
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return true;
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}
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void CDBEnv::MakeMock()
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{
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if (fDbEnvInit)
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throw runtime_error("CDBEnv::MakeMock: Already initialized");
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boost::this_thread::interruption_point();
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LogPrint("db", "CDBEnv::MakeMock\n");
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dbenv.set_cachesize(1, 0, 1);
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dbenv.set_lg_bsize(10485760 * 4);
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dbenv.set_lg_max(10485760);
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dbenv.set_lk_max_locks(10000);
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dbenv.set_lk_max_objects(10000);
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dbenv.set_flags(DB_AUTO_COMMIT, 1);
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dbenv.log_set_config(DB_LOG_IN_MEMORY, 1);
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int ret = dbenv.open(NULL,
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DB_CREATE |
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DB_INIT_LOCK |
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DB_INIT_LOG |
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DB_INIT_MPOOL |
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DB_INIT_TXN |
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DB_THREAD |
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DB_PRIVATE,
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S_IRUSR | S_IWUSR);
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if (ret > 0)
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throw runtime_error(strprintf("CDBEnv::MakeMock: Error %d opening database environment.", ret));
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fDbEnvInit = true;
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fMockDb = true;
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}
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CDBEnv::VerifyResult CDBEnv::Verify(std::string strFile, bool (*recoverFunc)(CDBEnv& dbenv, std::string strFile))
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{
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LOCK(cs_db);
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assert(mapFileUseCount.count(strFile) == 0);
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Db db(&dbenv, 0);
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int result = db.verify(strFile.c_str(), NULL, NULL, 0);
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if (result == 0)
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return VERIFY_OK;
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else if (recoverFunc == NULL)
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return RECOVER_FAIL;
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// Try to recover:
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bool fRecovered = (*recoverFunc)(*this, strFile);
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return (fRecovered ? RECOVER_OK : RECOVER_FAIL);
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}
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bool CDBEnv::Salvage(std::string strFile, bool fAggressive, std::vector<CDBEnv::KeyValPair>& vResult)
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{
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LOCK(cs_db);
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assert(mapFileUseCount.count(strFile) == 0);
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u_int32_t flags = DB_SALVAGE;
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if (fAggressive)
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flags |= DB_AGGRESSIVE;
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stringstream strDump;
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Db db(&dbenv, 0);
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int result = db.verify(strFile.c_str(), NULL, &strDump, flags);
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if (result == DB_VERIFY_BAD) {
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LogPrintf("CDBEnv::Salvage: Database salvage found errors, all data may not be recoverable.\n");
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if (!fAggressive) {
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LogPrintf("CDBEnv::Salvage: Rerun with aggressive mode to ignore errors and continue.\n");
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return false;
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}
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}
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if (result != 0 && result != DB_VERIFY_BAD) {
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LogPrintf("CDBEnv::Salvage: Database salvage failed with result %d.\n", result);
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return false;
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}
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// Format of bdb dump is ascii lines:
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// header lines...
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// HEADER=END
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// hexadecimal key
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// hexadecimal value
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// ... repeated
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// DATA=END
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string strLine;
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while (!strDump.eof() && strLine != "HEADER=END")
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getline(strDump, strLine); // Skip past header
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std::string keyHex, valueHex;
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while (!strDump.eof() && keyHex != "DATA=END") {
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getline(strDump, keyHex);
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if (keyHex != "DATA_END") {
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getline(strDump, valueHex);
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vResult.push_back(make_pair(ParseHex(keyHex), ParseHex(valueHex)));
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}
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}
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return (result == 0);
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}
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void CDBEnv::CheckpointLSN(const std::string& strFile)
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{
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dbenv.txn_checkpoint(0, 0, 0);
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if (fMockDb)
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return;
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dbenv.lsn_reset(strFile.c_str(), 0);
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}
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CDB::CDB(const std::string& strFilename, const char* pszMode, bool fFlushOnCloseIn) : pdb(NULL), activeTxn(NULL)
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{
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int ret;
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fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
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fFlushOnClose = fFlushOnCloseIn;
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if (strFilename.empty())
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return;
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bool fCreate = strchr(pszMode, 'c') != NULL;
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unsigned int nFlags = DB_THREAD;
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if (fCreate)
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nFlags |= DB_CREATE;
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{
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LOCK(bitdb.cs_db);
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if (!bitdb.Open(GetDataDir()))
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throw runtime_error("CDB: Failed to open database environment.");
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strFile = strFilename;
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++bitdb.mapFileUseCount[strFile];
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pdb = bitdb.mapDb[strFile];
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if (pdb == NULL) {
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pdb = new Db(&bitdb.dbenv, 0);
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bool fMockDb = bitdb.IsMock();
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if (fMockDb) {
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DbMpoolFile* mpf = pdb->get_mpf();
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ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
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if (ret != 0)
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throw runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFile));
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}
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ret = pdb->open(NULL, // Txn pointer
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fMockDb ? NULL : strFile.c_str(), // Filename
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fMockDb ? strFile.c_str() : "main", // Logical db name
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DB_BTREE, // Database type
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nFlags, // Flags
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0);
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if (ret != 0) {
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delete pdb;
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pdb = NULL;
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--bitdb.mapFileUseCount[strFile];
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strFile = "";
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throw runtime_error(strprintf("CDB: Error %d, can't open database %s", ret, strFile));
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}
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if (fCreate && !Exists(string("version"))) {
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bool fTmp = fReadOnly;
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fReadOnly = false;
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WriteVersion(CLIENT_VERSION);
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fReadOnly = fTmp;
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}
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bitdb.mapDb[strFile] = pdb;
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}
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}
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}
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void CDB::Flush()
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{
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if (activeTxn)
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return;
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// Flush database activity from memory pool to disk log
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unsigned int nMinutes = 0;
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if (fReadOnly)
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nMinutes = 1;
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bitdb.dbenv.txn_checkpoint(nMinutes ? GetArg("-dblogsize", 100) * 1024 : 0, nMinutes, 0);
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}
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void CDB::Close()
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{
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if (!pdb)
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return;
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if (activeTxn)
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activeTxn->abort();
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activeTxn = NULL;
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pdb = NULL;
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if (fFlushOnClose)
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Flush();
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{
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LOCK(bitdb.cs_db);
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--bitdb.mapFileUseCount[strFile];
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}
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}
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void CDBEnv::CloseDb(const string& strFile)
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{
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{
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LOCK(cs_db);
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if (mapDb[strFile] != NULL) {
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// Close the database handle
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Db* pdb = mapDb[strFile];
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pdb->close(0);
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delete pdb;
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mapDb[strFile] = NULL;
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}
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}
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}
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bool CDBEnv::RemoveDb(const string& strFile)
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{
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this->CloseDb(strFile);
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LOCK(cs_db);
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int rc = dbenv.dbremove(NULL, strFile.c_str(), NULL, DB_AUTO_COMMIT);
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return (rc == 0);
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}
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bool CDB::Rewrite(const string& strFile, const char* pszSkip)
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{
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while (true) {
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{
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LOCK(bitdb.cs_db);
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if (!bitdb.mapFileUseCount.count(strFile) || bitdb.mapFileUseCount[strFile] == 0) {
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// Flush log data to the dat file
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bitdb.CloseDb(strFile);
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bitdb.CheckpointLSN(strFile);
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bitdb.mapFileUseCount.erase(strFile);
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bool fSuccess = true;
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LogPrintf("CDB::Rewrite: Rewriting %s...\n", strFile);
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string strFileRes = strFile + ".rewrite";
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{ // surround usage of db with extra {}
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CDB db(strFile.c_str(), "r");
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Db* pdbCopy = new Db(&bitdb.dbenv, 0);
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int ret = pdbCopy->open(NULL, // Txn pointer
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strFileRes.c_str(), // Filename
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"main", // Logical db name
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DB_BTREE, // Database type
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DB_CREATE, // Flags
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0);
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if (ret > 0) {
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LogPrintf("CDB::Rewrite: Can't create database file %s\n", strFileRes);
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fSuccess = false;
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}
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Dbc* pcursor = db.GetCursor();
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if (pcursor)
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while (fSuccess) {
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CDataStream ssKey(SER_DISK, CLIENT_VERSION);
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CDataStream ssValue(SER_DISK, CLIENT_VERSION);
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int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
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if (ret == DB_NOTFOUND) {
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pcursor->close();
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break;
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} else if (ret != 0) {
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pcursor->close();
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fSuccess = false;
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break;
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}
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if (pszSkip &&
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strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
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continue;
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if (strncmp(&ssKey[0], "\x07version", 8) == 0) {
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// Update version:
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ssValue.clear();
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ssValue << CLIENT_VERSION;
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}
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Dbt datKey(&ssKey[0], ssKey.size());
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Dbt datValue(&ssValue[0], ssValue.size());
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int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
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if (ret2 > 0)
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fSuccess = false;
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}
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if (fSuccess) {
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db.Close();
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bitdb.CloseDb(strFile);
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if (pdbCopy->close(0))
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fSuccess = false;
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delete pdbCopy;
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}
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}
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if (fSuccess) {
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Db dbA(&bitdb.dbenv, 0);
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if (dbA.remove(strFile.c_str(), NULL, 0))
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fSuccess = false;
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Db dbB(&bitdb.dbenv, 0);
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if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
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fSuccess = false;
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}
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if (!fSuccess)
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LogPrintf("CDB::Rewrite: Failed to rewrite database file %s\n", strFileRes);
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return fSuccess;
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}
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}
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MilliSleep(100);
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}
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return false;
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}
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void CDBEnv::Flush(bool fShutdown)
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{
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int64_t nStart = GetTimeMillis();
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// Flush log data to the actual data file on all files that are not in use
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LogPrint("db", "CDBEnv::Flush: Flush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started");
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if (!fDbEnvInit)
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return;
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{
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LOCK(cs_db);
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map<string, int>::iterator mi = mapFileUseCount.begin();
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while (mi != mapFileUseCount.end()) {
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string strFile = (*mi).first;
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int nRefCount = (*mi).second;
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LogPrint("db", "CDBEnv::Flush: Flushing %s (refcount = %d)...\n", strFile, nRefCount);
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if (nRefCount == 0) {
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// Move log data to the dat file
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CloseDb(strFile);
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LogPrint("db", "CDBEnv::Flush: %s checkpoint\n", strFile);
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dbenv.txn_checkpoint(0, 0, 0);
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LogPrint("db", "CDBEnv::Flush: %s detach\n", strFile);
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if (!fMockDb)
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dbenv.lsn_reset(strFile.c_str(), 0);
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LogPrint("db", "CDBEnv::Flush: %s closed\n", strFile);
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mapFileUseCount.erase(mi++);
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} else
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mi++;
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}
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LogPrint("db", "CDBEnv::Flush: Flush(%s)%s took %15dms\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " database not started", GetTimeMillis() - nStart);
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if (fShutdown) {
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char** listp;
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if (mapFileUseCount.empty()) {
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dbenv.log_archive(&listp, DB_ARCH_REMOVE);
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Close();
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if (!fMockDb)
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boost::filesystem::remove_all(path / "database");
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}
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}
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}
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}
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