1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
12 #include <boost/filesystem.hpp>
13 #include <boost/filesystem/fstream.hpp>
22 unsigned int nWalletDBUpdated;
23 extern bool fUseMemoryLog;
32 void CDBEnv::EnvShutdown()
38 int ret = dbenv.close(0);
40 printf("EnvShutdown exception: %s (%d)\n", DbEnv::strerror(ret), ret);
42 DbEnv(0u).remove(strPath.c_str(), 0);
45 CDBEnv::CDBEnv() : fDbEnvInit(false), fMockDb(false), dbenv(DB_CXX_NO_EXCEPTIONS) { }
57 bool CDBEnv::Open(boost::filesystem::path pathEnv_)
66 boost::filesystem::path pathDataDir = pathEnv;
67 strPath = pathDataDir.string();
68 boost::filesystem::path pathLogDir = pathDataDir / "database";
69 boost::filesystem::create_directory(pathLogDir);
70 boost::filesystem::path pathErrorFile = pathDataDir / "db.log";
71 printf("dbenv.open LogDir=%s ErrorFile=%s\n", pathLogDir.string().c_str(), pathErrorFile.string().c_str());
73 unsigned int nEnvFlags = 0;
74 if (GetBoolArg("-privdb", true))
75 nEnvFlags |= DB_PRIVATE;
77 int nDbCache = GetArgInt("-dbcache", 25);
78 dbenv.set_lg_dir(pathLogDir.string().c_str());
79 dbenv.set_cachesize(nDbCache / 1024, (nDbCache % 1024)*1048576, 1);
80 dbenv.set_lg_bsize(1048576);
81 dbenv.set_lg_max(10485760);
83 // Bugfix: Bump lk_max_locks default to 537000, to safely handle reorgs with up to 5 blocks reversed
84 // dbenv.set_lk_max_locks(10000);
85 dbenv.set_lk_max_locks(537000);
87 dbenv.set_lk_max_objects(10000);
88 dbenv.set_errfile(fopen(pathErrorFile.string().c_str(), "a")); /// debug
89 dbenv.set_flags(DB_AUTO_COMMIT, 1);
90 dbenv.set_flags(DB_TXN_WRITE_NOSYNC, 1);
91 #ifdef DB_LOG_AUTO_REMOVE
92 dbenv.log_set_config(DB_LOG_AUTO_REMOVE, 1);
94 int ret = dbenv.open(strPath.c_str(),
105 return error("CDB() : error %s (%d) opening database environment", DbEnv::strerror(ret), ret);
113 void CDBEnv::MakeMock()
116 throw runtime_error("CDBEnv::MakeMock(): already initialized");
119 throw runtime_error("CDBEnv::MakeMock(): during shutdown");
121 printf("CDBEnv::MakeMock()\n");
123 dbenv.set_cachesize(1, 0, 1);
124 dbenv.set_lg_bsize(10485760*4);
125 dbenv.set_lg_max(10485760);
126 dbenv.set_lk_max_locks(10000);
127 dbenv.set_lk_max_objects(10000);
128 dbenv.set_flags(DB_AUTO_COMMIT, 1);
129 #ifdef DB_LOG_IN_MEMORY
130 dbenv.log_set_config(DB_LOG_IN_MEMORY, fUseMemoryLog ? 1 : 0);
132 int ret = dbenv.open(NULL,
142 throw runtime_error(strprintf("CDBEnv::MakeMock(): error %d opening database environment", ret));
148 CDBEnv::VerifyResult CDBEnv::Verify(std::string strFile, bool (*recoverFunc)(CDBEnv& dbenv, std::string strFile))
151 assert(mapFileUseCount.count(strFile) == 0);
154 int result = db.verify(strFile.c_str(), NULL, NULL, 0);
157 else if (recoverFunc == NULL)
161 bool fRecovered = (*recoverFunc)(*this, strFile);
162 return (fRecovered ? RECOVER_OK : RECOVER_FAIL);
165 bool CDBEnv::Salvage(std::string strFile, bool fAggressive,
166 std::vector<CDBEnv::KeyValPair >& vResult)
169 assert(mapFileUseCount.count(strFile) == 0);
171 u_int32_t flags = DB_SALVAGE;
172 if (fAggressive) flags |= DB_AGGRESSIVE;
174 stringstream strDump;
177 int result = db.verify(strFile.c_str(), NULL, &strDump, flags);
180 printf("ERROR: db salvage failed\n");
184 // Format of bdb dump is ascii lines:
193 while (!strDump.eof() && strLine != "HEADER=END")
194 getline(strDump, strLine); // Skip past header
196 std::string keyHex, valueHex;
197 while (!strDump.eof() && keyHex != "DATA=END")
199 getline(strDump, keyHex);
200 if (keyHex != "DATA=END")
202 getline(strDump, valueHex);
203 vResult.push_back(make_pair(ParseHex(keyHex),ParseHex(valueHex)));
207 return (result == 0);
211 void CDBEnv::CheckpointLSN(std::string strFile)
213 dbenv.txn_checkpoint(0, 0, 0);
216 dbenv.lsn_reset(strFile.c_str(), 0);
220 CDB::CDB(const char *pszFile, const char* pszMode) :
221 pdb(NULL), activeTxn(NULL)
227 fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
228 bool fCreate = strchr(pszMode, 'c') != NULL;
229 unsigned int nFlags = DB_THREAD;
235 if (!bitdb.Open(GetDataDir()))
236 throw runtime_error("env open failed");
239 ++bitdb.mapFileUseCount[strFile];
240 pdb = bitdb.mapDb[strFile];
243 pdb = new Db(&bitdb.dbenv, 0);
245 bool fMockDb = bitdb.IsMock();
248 DbMpoolFile*mpf = pdb->get_mpf();
249 ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
251 throw runtime_error(strprintf("CDB() : failed to configure for no temp file backing for database %s", pszFile));
254 ret = pdb->open(NULL, // Txn pointer
255 fMockDb ? NULL : pszFile, // Filename
256 "main", // Logical db name
257 DB_BTREE, // Database type
265 --bitdb.mapFileUseCount[strFile];
267 throw runtime_error(strprintf("CDB() : can't open database file %s, error %d", pszFile, ret));
270 if (fCreate && !Exists(string("version")))
272 bool fTmp = fReadOnly;
274 WriteVersion(CLIENT_VERSION);
278 bitdb.mapDb[strFile] = pdb;
292 // Flush database activity from memory pool to disk log
293 unsigned int nMinutes = 0;
297 bitdb.dbenv.txn_checkpoint(nMinutes ? GetArgUInt("-dblogsize", 100)*1024 : 0, nMinutes, 0);
301 --bitdb.mapFileUseCount[strFile];
305 void CDBEnv::CloseDb(const string& strFile)
309 if (mapDb[strFile] != NULL)
311 // Close the database handle
312 Db* pdb = mapDb[strFile];
315 mapDb[strFile] = NULL;
320 bool CDBEnv::RemoveDb(const string& strFile)
322 this->CloseDb(strFile);
325 int rc = dbenv.dbremove(NULL, strFile.c_str(), NULL, DB_AUTO_COMMIT);
329 bool CDB::Rewrite(const string& strFile, const char* pszSkip)
335 if (!bitdb.mapFileUseCount.count(strFile) || bitdb.mapFileUseCount[strFile] == 0)
337 // Flush log data to the dat file
338 bitdb.CloseDb(strFile);
339 bitdb.CheckpointLSN(strFile);
340 bitdb.mapFileUseCount.erase(strFile);
342 bool fSuccess = true;
343 printf("Rewriting %s...\n", strFile.c_str());
344 string strFileRes = strFile + ".rewrite";
345 { // surround usage of db with extra {}
346 CDB db(strFile.c_str(), "r");
347 Db* pdbCopy = new Db(&bitdb.dbenv, 0);
349 int ret = pdbCopy->open(NULL, // Txn pointer
350 strFileRes.c_str(), // Filename
351 "main", // Logical db name
352 DB_BTREE, // Database type
357 printf("Cannot create database file %s\n", strFileRes.c_str());
361 Dbc* pcursor = db.GetCursor();
365 CDataStream ssKey(SER_DISK, CLIENT_VERSION);
366 CDataStream ssValue(SER_DISK, CLIENT_VERSION);
367 int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
368 if (ret == DB_NOTFOUND)
382 size_t pszSkipLen = strlen(pszSkip);
383 if (strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), pszSkipLen)) == 0)
387 if (strncmp(&ssKey[0], "\x07version", 8) == 0)
391 ssValue << CLIENT_VERSION;
393 Dbt datKey(&ssKey[0], ssKey.size());
394 Dbt datValue(&ssValue[0], ssValue.size());
395 int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
403 bitdb.CloseDb(strFile);
404 if (pdbCopy->close(0))
411 Db dbA(&bitdb.dbenv, 0);
412 if (dbA.remove(strFile.c_str(), NULL, 0))
414 Db dbB(&bitdb.dbenv, 0);
415 if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
419 printf("Rewriting of %s FAILED!\n", strFileRes.c_str());
429 void CDBEnv::Flush(bool fShutdown)
431 int64_t nStart = GetTimeMillis();
432 // Flush log data to the actual data file
433 // on all files that are not in use
434 printf("Flush(%s)%s\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started");
439 map<string, int>::iterator mi = mapFileUseCount.begin();
440 while (mi != mapFileUseCount.end())
442 string strFile = (*mi).first;
443 int nRefCount = (*mi).second;
444 printf("%s refcount=%d\n", strFile.c_str(), nRefCount);
447 // Move log data to the dat file
449 printf("%s checkpoint\n", strFile.c_str());
450 dbenv.txn_checkpoint(0, 0, 0);
451 printf("%s detach\n", strFile.c_str());
453 dbenv.lsn_reset(strFile.c_str(), 0);
454 printf("%s closed\n", strFile.c_str());
455 mapFileUseCount.erase(mi++);
460 printf("DBFlush(%s)%s ended %15" PRId64 "ms\n", fShutdown ? "true" : "false", fDbEnvInit ? "" : " db not started", GetTimeMillis() - nStart);
464 if (mapFileUseCount.empty())
466 dbenv.log_archive(&listp, DB_ARCH_REMOVE);
478 unsigned char CAddrDB::pchMessageStart[4] = {};
482 pathAddr = GetDataDir() / "peers.dat";
485 bool CAddrDB::Write(const CAddrMan& addr)
487 // Generate random temporary filename
488 unsigned short randv = 0;
489 GetRandBytes((unsigned char *)&randv, sizeof(randv));
490 std::string tmpfn = strprintf("peers.dat.%04x", randv);
492 // serialize addresses, checksum data up to that point, then append csum
493 CDataStream ssPeers(SER_DISK, CLIENT_VERSION);
494 ssPeers << FLATDATA(CAddrDB::pchMessageStart);
496 uint256 hash = Hash(ssPeers.begin(), ssPeers.end());
499 // open temp output file, and associate with CAutoFile
500 boost::filesystem::path pathTmp = GetDataDir() / tmpfn;
501 FILE *file = fopen(pathTmp.string().c_str(), "wb");
502 CAutoFile fileout = CAutoFile(file, SER_DISK, CLIENT_VERSION);
504 return error("CAddrman::Write() : open failed");
506 // Write and commit header, data
510 catch (const std::exception&) {
511 return error("CAddrman::Write() : I/O error");
516 // replace existing peers.dat, if any, with new peers.dat.XXXX
517 if (!RenameOver(pathTmp, pathAddr))
518 return error("CAddrman::Write() : Rename-into-place failed");
523 bool CAddrDB::Read(CAddrMan& addr)
525 // open input file, and associate with CAutoFile
526 FILE *file = fopen(pathAddr.string().c_str(), "rb");
527 CAutoFile filein = CAutoFile(file, SER_DISK, CLIENT_VERSION);
529 return error("CAddrman::Read() : open failed");
531 // use file size to size memory buffer
532 int fileSize = GetFilesize(filein);
533 int dataSize = fileSize - sizeof(uint256);
534 //Don't try to resize to a negative number if file is small
535 if ( dataSize < 0 ) dataSize = 0;
536 vector<unsigned char> vchData;
537 vchData.resize(dataSize);
540 // read data and checksum from file
542 filein.read((char *)&vchData[0], dataSize);
545 catch (const std::exception&) {
546 return error("CAddrman::Read() 2 : I/O error or stream data corrupted");
550 CDataStream ssPeers(vchData, SER_DISK, CLIENT_VERSION);
552 // verify stored checksum matches input data
553 uint256 hashTmp = Hash(ssPeers.begin(), ssPeers.end());
554 if (hashIn != hashTmp)
555 return error("CAddrman::Read() : checksum mismatch; data corrupted");
557 unsigned char pchMsgTmp[4];
559 // de-serialize file header (CAddrDB::pchMessageStart magic number) and
560 ssPeers >> FLATDATA(pchMsgTmp);
562 // verify the network matches ours
563 if (memcmp(pchMsgTmp, CAddrDB::pchMessageStart, sizeof(pchMsgTmp)))
564 return error("CAddrman::Read() : invalid network magic number");
566 // de-serialize address data into one CAddrMan object
569 catch (const std::exception&) {
570 return error("CAddrman::Read() : I/O error or stream data corrupted");