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// @file durop.cpp
/**
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mongo/pch.h"
#include "mongo/db/durop.h"
#include "mongo/db/d_concurrency.h"
#include "mongo/db/mongommf.h"
#include "mongo/util/alignedbuilder.h"
#include "mongo/util/file.h"
#include "mongo/util/file_allocator.h"
#include "mongo/util/mongoutils/str.h"
using namespace mongoutils;
#include <boost/filesystem/operations.hpp>
namespace mongo {
extern string dbpath; // --dbpath parm
void _deleteDataFiles(const char *);
namespace dur {
/** read a durop from journal file referenced by br.
@param opcode the opcode which has already been written from the bufreader
*/
shared_ptr<DurOp> DurOp::read(unsigned opcode, BufReader& br) {
shared_ptr<DurOp> op;
switch( opcode ) {
case JEntry::OpCode_FileCreated:
op = shared_ptr<DurOp>( new FileCreatedOp(br) );
break;
case JEntry::OpCode_DropDb:
op = shared_ptr<DurOp>( new DropDbOp(br) );
break;
default:
massert(13546, (str::stream() << "journal recover: unrecognized opcode in journal " << opcode), false);
}
return op;
}
void DurOp::serialize(AlignedBuilder& ab) {
ab.appendNum(_opcode);
_serialize(ab);
}
DropDbOp::DropDbOp(BufReader& log) : DurOp(JEntry::OpCode_DropDb) {
unsigned long long reserved;
log.read(reserved);
log.read(reserved);
log.readStr(_db);
string reservedStr;
log.readStr(reservedStr);
}
void DropDbOp::_serialize(AlignedBuilder& ab) {
ab.appendNum((unsigned long long) 0); // reserved for future use
ab.appendNum((unsigned long long) 0); // reserved for future use
ab.appendStr(_db);
ab.appendStr(""); // reserved
}
/** throws */
void DropDbOp::replay() {
log() << "recover replay drop db " << _db << endl;
_deleteDataFiles(_db.c_str());
}
FileCreatedOp::FileCreatedOp(const std::string& f, unsigned long long l) :
DurOp(JEntry::OpCode_FileCreated) {
_p = RelativePath::fromFullPath(f);
_len = l;
}
FileCreatedOp::FileCreatedOp(BufReader& log) : DurOp(JEntry::OpCode_FileCreated) {
unsigned long long reserved;
log.read(reserved);
log.read(reserved);
log.read(_len); // size of file, not length of name
string s;
log.readStr(s);
_p._p = s;
}
void FileCreatedOp::_serialize(AlignedBuilder& ab) {
ab.appendNum((unsigned long long) 0); // reserved for future use
ab.appendNum((unsigned long long) 0); // reserved for future use
ab.appendNum(_len);
ab.appendStr(_p.toString());
}
string FileCreatedOp::toString() {
return str::stream() << "FileCreatedOp " << _p.toString() << ' ' << _len/1024.0/1024.0 << "MB";
}
// if an operation deletes or creates a file (or moves etc.), it may need files closed.
bool FileCreatedOp::needFilesClosed() {
return boost::filesystem::exists( _p.asFullPath() );
}
void FileCreatedOp::replay() {
// i believe the code assumes new files are filled with zeros. thus we have to recreate the file,
// or rewrite at least, even if it were the right length. perhaps one day we should change that
// although easier to avoid defects if we assume it is zeros perhaps.
string full = _p.asFullPath();
if( boost::filesystem::exists(full) ) {
try {
boost::filesystem::remove(full);
}
catch(std::exception& e) {
LOG(1) << "recover info FileCreateOp::replay unlink " << e.what() << endl;
}
}
log() << "recover create file " << full << ' ' << _len/1024.0/1024.0 << "MB" << endl;
if( boost::filesystem::exists(full) ) {
// first delete if exists.
try {
boost::filesystem::remove(full);
}
catch(...) {
log() << "warning could not delete file " << full << endl;
}
}
ensureParentDirCreated(full);
File f;
f.open(full.c_str());
massert(13547, str::stream() << "recover couldn't create file " << full, f.is_open());
unsigned long long left = _len;
const unsigned blksz = 64 * 1024;
scoped_array<char> v( new char[blksz] );
memset( v.get(), 0, blksz );
fileofs ofs = 0;
while( left ) {
unsigned long long w = left < blksz ? left : blksz;
f.write(ofs, v.get(), (unsigned) w);
left -= w;
ofs += w;
}
f.fsync();
flushMyDirectory(full);
massert(13628, str::stream() << "recover failure writing file " << full, !f.bad() );
}
}
}
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