mirror of
https://github.com/uroni/urbackup_backend.git
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132 lines
3.8 KiB
C++
132 lines
3.8 KiB
C++
/*************************************************************************
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* UrBackup - Client/Server backup system
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* Copyright (C) 2011-2016 Martin Raiber
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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**************************************************************************/
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#include "WalCheckpointThread.h"
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#include "../urbackupcommon/os_functions.h"
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#include "../Interface/File.h"
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#include "../Interface/Server.h"
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#include "database.h"
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#include "../Interface/Database.h"
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#include "../stringtools.h"
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#include <memory>
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WalCheckpointThread::WalCheckpointThread(int64 passive_checkpoint_size, int64 full_checkpoint_size, const std::string& db_fn, DATABASE_ID db_id)
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: last_checkpoint_wal_size(0), passive_checkpoint_size(passive_checkpoint_size),
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full_checkpoint_size(full_checkpoint_size), db_fn(db_fn), db_id(db_id)
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{
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}
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void WalCheckpointThread::checkpoint()
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{
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int mode = MODE_READ;
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#ifdef _WIN32
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mode=MODE_READ_DEVICE;
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#endif
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std::auto_ptr<IFile> wal_file(Server->openFile(db_fn+"-wal", mode));
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if(wal_file.get()!=NULL)
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{
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int64 wal_size = wal_file->Size();
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if (wal_size > full_checkpoint_size)
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{
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wal_file.reset();
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passive_checkpoint();
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Server->Log("Files WAL file "+ db_fn + "-wal greater than "+PrettyPrintBytes(full_checkpoint_size)+". Doing full WAL checkpoint...", LL_INFO);
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IDatabase* db = Server->getDatabase(Server->getThreadID(), db_id);
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db->lockForSingleUse();
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db->Write("PRAGMA wal_checkpoint(TRUNCATE)");
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db->unlockForSingleUse();
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Server->Log("Full checkpoint of "+ db_fn + "-wal done.", LL_INFO);
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last_checkpoint_wal_size = 0;
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}
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else if (wal_size - last_checkpoint_wal_size > passive_checkpoint_size)
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{
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last_checkpoint_wal_size = wal_size;
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wal_file.reset();
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passive_checkpoint();
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}
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else if (wal_size < last_checkpoint_wal_size)
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{
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last_checkpoint_wal_size = 0;
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}
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}
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else
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{
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Server->Log("Could not open WAL file (wal checkpoint thread)", LL_WARNING);
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}
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}
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void WalCheckpointThread::operator()()
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{
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while(true)
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{
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Server->wait(10000); //every 10s
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checkpoint();
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}
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}
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void WalCheckpointThread::sync_database()
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{
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ScopedBackgroundPrio background_prio;
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Server->Log("Syncing database " + db_fn + "...", LL_DEBUG);
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int rw_mode = MODE_RW;
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#ifdef _WIN32
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rw_mode = MODE_RW_DEVICE;
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#endif
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{
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std::auto_ptr<IFile> db_file(Server->openFile(db_fn, rw_mode));
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if (db_file.get() != NULL)
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{
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db_file->Sync();
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}
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}
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Server->Log("Syncing wal file " + db_fn + "-wal...", LL_DEBUG);
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{
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std::auto_ptr<IFile> rw_wal_file(Server->openFile(db_fn + "-wal", rw_mode));
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if (rw_wal_file.get() != NULL)
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{
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rw_wal_file->Sync();
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}
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}
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}
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void WalCheckpointThread::passive_checkpoint()
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{
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ScopedBackgroundPrio background_prio;
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Server->Log("Starting passive WAL checkpoint of "+db_fn+"...", LL_DEBUG);
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IDatabase* db = Server->getDatabase(Server->getThreadID(), db_id);
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db_results res = db->Read("PRAGMA wal_checkpoint(PASSIVE)");
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if (!res.empty())
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{
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Server->Log("Passive WAL checkpoint of " + db_fn + " completed busy=" + res[0]["busy"] + " checkpointed=" + res[0]["checkpointed"] + " log=" + res[0]["log"], LL_DEBUG);
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}
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}
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