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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/db/operation_context_impl.h"
#include <memory>
#include "mongo/db/client.h"
#include "mongo/db/concurrency/lock_state.h"
#include "mongo/db/curop.h"
#include "mongo/db/service_context.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/platform/random.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
std::unique_ptr<Locker> newLocker() {
if (isMMAPV1())
return stdx::make_unique<MMAPV1LockerImpl>();
return stdx::make_unique<DefaultLockerImpl>();
}
class ClientOperationInfo {
public:
Locker* getLocker() {
if (!_locker) {
_locker = newLocker();
}
return _locker.get();
}
private:
std::unique_ptr<Locker> _locker;
};
const auto clientOperationInfoDecoration = Client::declareDecoration<ClientOperationInfo>();
AtomicUInt32 nextOpId{1};
} // namespace
using std::string;
OperationContextImpl::OperationContextImpl()
: OperationContext(
&cc(), nextOpId.fetchAndAdd(1), clientOperationInfoDecoration(cc()).getLocker()),
_writesAreReplicated(true) {
StorageEngine* storageEngine = getGlobalServiceContext()->getGlobalStorageEngine();
_recovery.reset(storageEngine->newRecoveryUnit());
auto client = getClient();
stdx::lock_guard<Client> lk(*client);
client->setOperationContext(this);
}
OperationContextImpl::~OperationContextImpl() {
lockState()->assertEmptyAndReset();
auto client = getClient();
stdx::lock_guard<Client> lk(*client);
client->resetOperationContext();
}
RecoveryUnit* OperationContextImpl::recoveryUnit() const {
return _recovery.get();
}
RecoveryUnit* OperationContextImpl::releaseRecoveryUnit() {
return _recovery.release();
}
OperationContext::RecoveryUnitState OperationContextImpl::setRecoveryUnit(RecoveryUnit* unit,
RecoveryUnitState state) {
_recovery.reset(unit);
RecoveryUnitState oldState = _ruState;
_ruState = state;
return oldState;
}
ProgressMeter* OperationContextImpl::setMessage_inlock(const char* msg,
const std::string& name,
unsigned long long progressMeterTotal,
int secondsBetween) {
return &CurOp::get(this)->setMessage_inlock(msg, name, progressMeterTotal, secondsBetween);
}
string OperationContextImpl::getNS() const {
return CurOp::get(this)->getNS();
}
uint64_t OperationContextImpl::getRemainingMaxTimeMicros() const {
return CurOp::get(this)->getRemainingMaxTimeMicros();
}
// Enabling the checkForInterruptFail fail point will start a game of random chance on the
// connection specified in the fail point data, generating an interrupt with a given fixed
// probability. Example invocation:
//
// {configureFailPoint: "checkForInterruptFail",
// mode: "alwaysOn",
// data: {conn: 17, chance: .01, allowNested: true}}
//
// All three data fields must be specified. In the above example, all interrupt points on
// connection 17 will generate a kill on the current operation with probability p(.01),
// including interrupt points of nested operations. If "allowNested" is false, nested
// operations are not targeted. "chance" must be a double between 0 and 1, inclusive.
MONGO_FP_DECLARE(checkForInterruptFail);
namespace {
// Helper function for checkForInterrupt fail point. Decides whether the operation currently
// being run by the given Client meet the (probabilistic) conditions for interruption as
// specified in the fail point info.
bool opShouldFail(const OperationContextImpl* opCtx, const BSONObj& failPointInfo) {
// Only target the client with the specified connection number.
if (opCtx->getClient()->getConnectionId() != failPointInfo["conn"].safeNumberLong()) {
return false;
}
// Only target nested operations if requested.
if (!failPointInfo["allowNested"].trueValue() && CurOp::get(opCtx)->parent() != NULL) {
return false;
}
// Return true with (approx) probability p = "chance". Recall: 0 <= chance <= 1.
double next = static_cast<double>(std::abs(opCtx->getClient()->getPrng().nextInt64()));
double upperBound =
std::numeric_limits<int64_t>::max() * failPointInfo["chance"].numberDouble();
if (next > upperBound) {
return false;
}
return true;
}
} // namespace
void OperationContextImpl::checkForInterrupt() {
// We cannot interrupt operation, while it's inside of a write unit of work, because logOp
// cannot handle being iterrupted.
if (lockState()->inAWriteUnitOfWork())
return;
uassertStatusOK(checkForInterruptNoAssert());
}
Status OperationContextImpl::checkForInterruptNoAssert() {
if (getGlobalServiceContext()->getKillAllOperations()) {
return Status(ErrorCodes::InterruptedAtShutdown, "interrupted at shutdown");
}
CurOp* curOp = CurOp::get(this);
if (curOp->maxTimeHasExpired()) {
markKilled();
return Status(ErrorCodes::ExceededTimeLimit, "operation exceeded time limit");
}
MONGO_FAIL_POINT_BLOCK(checkForInterruptFail, scopedFailPoint) {
if (opShouldFail(this, scopedFailPoint.getData())) {
log() << "set pending kill on " << (curOp->parent() ? "nested" : "top-level") << " op "
<< getOpID() << ", for checkForInterruptFail";
markKilled();
}
}
const auto killStatus = getKillStatus();
if (killStatus != ErrorCodes::OK) {
return Status(killStatus, "operation was interrupted");
}
return Status::OK();
}
bool OperationContextImpl::isPrimaryFor(StringData ns) {
return repl::getGlobalReplicationCoordinator()->canAcceptWritesFor(NamespaceString(ns));
}
void OperationContextImpl::setReplicatedWrites(bool writesAreReplicated) {
_writesAreReplicated = writesAreReplicated;
}
bool OperationContextImpl::writesAreReplicated() const {
return _writesAreReplicated;
}
} // namespace mongo
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