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/**
* Copyright (C) 2014 MongoDB 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/client.h"
#include "mongo/db/curop.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/stats/top.h"
namespace mongo {
AutoGetDb::AutoGetDb(OperationContext* opCtx, StringData ns, LockMode mode)
: _dbLock(opCtx, ns, mode), _db(dbHolder().get(opCtx, ns)) {}
AutoGetCollection::AutoGetCollection(OperationContext* opCtx,
const NamespaceString& nss,
LockMode modeDB,
LockMode modeColl,
ViewMode viewMode)
: _viewMode(viewMode),
_autoDb(opCtx, nss.db(), modeDB),
_collLock(opCtx->lockState(), nss.ns(), modeColl),
_coll(_autoDb.getDb() ? _autoDb.getDb()->getCollection(nss) : nullptr) {
Database* db = _autoDb.getDb();
// If the database exists, but not the collection, check for views.
if (_viewMode == ViewMode::kViewsForbidden && db && !_coll &&
db->getViewCatalog()->lookup(opCtx, nss.ns()))
uasserted(ErrorCodes::CommandNotSupportedOnView,
str::stream() << "Namespace " << nss.ns() << " is a view, not a collection");
}
AutoGetOrCreateDb::AutoGetOrCreateDb(OperationContext* opCtx, StringData ns, LockMode mode)
: _dbLock(opCtx, ns, mode), _db(dbHolder().get(opCtx, ns)) {
invariant(mode == MODE_IX || mode == MODE_X);
_justCreated = false;
// If the database didn't exist, relock in MODE_X
if (_db == NULL) {
if (mode != MODE_X) {
_dbLock.relockWithMode(MODE_X);
}
_db = dbHolder().openDb(opCtx, ns);
_justCreated = true;
}
}
AutoStatsTracker::AutoStatsTracker(OperationContext* opCtx,
const NamespaceString& nss,
Top::LockType lockType,
boost::optional<int> dbProfilingLevel)
: _opCtx(opCtx), _lockType(lockType) {
if (!dbProfilingLevel) {
// No profiling level was determined, attempt to read the profiling level from the Database
// object.
AutoGetDb autoDb(_opCtx, nss.db(), MODE_IS);
if (autoDb.getDb()) {
dbProfilingLevel = autoDb.getDb()->getProfilingLevel();
}
}
stdx::lock_guard<Client> clientLock(*_opCtx->getClient());
CurOp::get(_opCtx)->enter_inlock(nss.ns().c_str(), dbProfilingLevel);
}
AutoStatsTracker::~AutoStatsTracker() {
auto curOp = CurOp::get(_opCtx);
Top::get(_opCtx->getServiceContext())
.record(_opCtx,
curOp->getNS(),
curOp->getLogicalOp(),
_lockType,
_timer.micros(),
curOp->isCommand(),
curOp->getReadWriteType());
}
AutoGetCollectionForRead::AutoGetCollectionForRead(OperationContext* opCtx,
const NamespaceString& nss,
AutoGetCollection::ViewMode viewMode) {
_autoColl.emplace(opCtx, nss, MODE_IS, MODE_IS, viewMode);
// Note: this can yield.
_ensureMajorityCommittedSnapshotIsValid(nss, opCtx);
}
void AutoGetCollectionForRead::_ensureMajorityCommittedSnapshotIsValid(const NamespaceString& nss,
OperationContext* opCtx) {
while (true) {
auto coll = _autoColl->getCollection();
if (!coll) {
return;
}
auto minSnapshot = coll->getMinimumVisibleSnapshot();
if (!minSnapshot) {
return;
}
auto mySnapshot = opCtx->recoveryUnit()->getMajorityCommittedSnapshot();
if (!mySnapshot) {
return;
}
if (mySnapshot >= minSnapshot) {
return;
}
// Yield locks.
_autoColl = boost::none;
repl::ReplicationCoordinator::get(opCtx)->waitUntilSnapshotCommitted(opCtx, *minSnapshot);
uassertStatusOK(opCtx->recoveryUnit()->setReadFromMajorityCommittedSnapshot());
{
stdx::lock_guard<Client> lk(*opCtx->getClient());
CurOp::get(opCtx)->yielded();
}
// Relock.
_autoColl.emplace(opCtx, nss, MODE_IS);
}
}
AutoGetCollectionForReadCommand::AutoGetCollectionForReadCommand(
OperationContext* opCtx, const NamespaceString& nss, AutoGetCollection::ViewMode viewMode) {
_autoCollForRead.emplace(opCtx, nss, viewMode);
const int doNotChangeProfilingLevel = 0;
_statsTracker.emplace(opCtx,
nss,
Top::LockType::ReadLocked,
_autoCollForRead->getDb() ? _autoCollForRead->getDb()->getProfilingLevel()
: doNotChangeProfilingLevel);
// We have both the DB and collection locked, which is the prerequisite to do a stable shard
// version check, but we'd like to do the check after we have a satisfactory snapshot.
auto css = CollectionShardingState::get(opCtx, nss);
css->checkShardVersionOrThrow(opCtx);
}
AutoGetCollectionOrViewForReadCommand::AutoGetCollectionOrViewForReadCommand(
OperationContext* opCtx, const NamespaceString& nss)
: AutoGetCollectionForReadCommand(opCtx, nss, AutoGetCollection::ViewMode::kViewsPermitted),
_view(_autoCollForRead->getDb() && !getCollection()
? _autoCollForRead->getDb()->getViewCatalog()->lookup(opCtx, nss.ns())
: nullptr) {}
void AutoGetCollectionOrViewForReadCommand::releaseLocksForView() noexcept {
invariant(_view);
_view = nullptr;
_autoCollForRead = boost::none;
}
OldClientContext::OldClientContext(OperationContext* opCtx,
const std::string& ns,
Database* db,
bool justCreated)
: _justCreated(justCreated), _doVersion(true), _ns(ns), _db(db), _opCtx(opCtx) {
_finishInit();
}
OldClientContext::OldClientContext(OperationContext* opCtx,
const std::string& ns,
bool doVersion)
: _justCreated(false), // set for real in finishInit
_doVersion(doVersion),
_ns(ns),
_db(NULL),
_opCtx(opCtx) {
_finishInit();
}
void OldClientContext::_finishInit() {
_db = dbHolder().get(_opCtx, _ns);
if (_db) {
_justCreated = false;
} else {
invariant(_opCtx->lockState()->isDbLockedForMode(nsToDatabaseSubstring(_ns), MODE_X));
_db = dbHolder().openDb(_opCtx, _ns, &_justCreated);
invariant(_db);
}
if (_doVersion) {
_checkNotStale();
}
stdx::lock_guard<Client> lk(*_opCtx->getClient());
CurOp::get(_opCtx)->enter_inlock(_ns.c_str(), _db->getProfilingLevel());
}
void OldClientContext::_checkNotStale() const {
switch (CurOp::get(_opCtx)->getNetworkOp()) {
case dbGetMore: // getMore is special and should be handled elsewhere.
case dbUpdate: // update & delete check shard version in instance.cpp, so don't check
case dbDelete: // here as well.
break;
default:
auto css = CollectionShardingState::get(_opCtx, _ns);
css->checkShardVersionOrThrow(_opCtx);
}
}
OldClientContext::~OldClientContext() {
// Lock must still be held
invariant(_opCtx->lockState()->isLocked());
auto currentOp = CurOp::get(_opCtx);
Top::get(_opCtx->getClient()->getServiceContext())
.record(_opCtx,
currentOp->getNS(),
currentOp->getLogicalOp(),
_opCtx->lockState()->isWriteLocked() ? Top::LockType::WriteLocked
: Top::LockType::ReadLocked,
_timer.micros(),
currentOp->isCommand(),
currentOp->getReadWriteType());
}
OldClientWriteContext::OldClientWriteContext(OperationContext* opCtx, const std::string& ns)
: _opCtx(opCtx),
_nss(ns),
_autodb(opCtx, _nss.db(), MODE_IX),
_collk(opCtx->lockState(), ns, MODE_IX),
_c(opCtx, ns, _autodb.getDb(), _autodb.justCreated()) {
_collection = _c.db()->getCollection(ns);
if (!_collection && !_autodb.justCreated()) {
// relock database in MODE_X to allow collection creation
_collk.relockAsDatabaseExclusive(_autodb.lock());
Database* db = dbHolder().get(_opCtx, ns);
invariant(db == _c.db());
}
}
} // namespace mongo
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