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/**
* Copyright (C) 2016 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/s/migration_secondary_throttle_options.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/write_concern_options.h"
namespace mongo {
namespace {
const char kSecondaryThrottleMongos[] = "_secondaryThrottle";
const char kSecondaryThrottleMongod[] = "secondaryThrottle";
const char kWriteConcern[] = "writeConcern";
} // namespace
MigrationSecondaryThrottleOptions::MigrationSecondaryThrottleOptions(
SecondaryThrottleOption secondaryThrottle, boost::optional<BSONObj> writeConcernBSON)
: _secondaryThrottle(secondaryThrottle), _writeConcernBSON(std::move(writeConcernBSON)) {}
MigrationSecondaryThrottleOptions MigrationSecondaryThrottleOptions::create(
SecondaryThrottleOption option) {
return MigrationSecondaryThrottleOptions(option, boost::none);
}
MigrationSecondaryThrottleOptions MigrationSecondaryThrottleOptions::createWithWriteConcern(
const WriteConcernOptions& writeConcern) {
// Optimize on write concern, which makes no difference
if (writeConcern.wNumNodes <= 1 && writeConcern.wMode.empty()) {
return MigrationSecondaryThrottleOptions(kOff, boost::none);
}
return MigrationSecondaryThrottleOptions(kOn, writeConcern.toBSON());
}
StatusWith<MigrationSecondaryThrottleOptions> MigrationSecondaryThrottleOptions::createFromCommand(
const BSONObj& obj) {
SecondaryThrottleOption secondaryThrottle;
boost::optional<BSONObj> writeConcernBSON;
// Parse the two variants of the 'secondaryThrottle' option
{
bool isSecondaryThrottle;
Status status =
bsonExtractBooleanField(obj, kSecondaryThrottleMongod, &isSecondaryThrottle);
if (status == ErrorCodes::NoSuchKey) {
status = bsonExtractBooleanField(obj, kSecondaryThrottleMongos, &isSecondaryThrottle);
}
if (status == ErrorCodes::NoSuchKey) {
secondaryThrottle = kDefault;
} else if (status.isOK()) {
secondaryThrottle = (isSecondaryThrottle ? kOn : kOff);
} else {
return status;
}
}
// Extract the requested 'writeConcern' option
{
BSONElement writeConcernElem;
Status status = bsonExtractField(obj, kWriteConcern, &writeConcernElem);
if (status == ErrorCodes::NoSuchKey) {
return MigrationSecondaryThrottleOptions(secondaryThrottle, boost::none);
} else if (!status.isOK()) {
return status;
}
if (secondaryThrottle != kOn) {
return Status(ErrorCodes::UnsupportedFormat,
"Cannot specify write concern when secondaryThrottle is not set");
}
writeConcernBSON = writeConcernElem.Obj().getOwned();
}
invariant(writeConcernBSON.is_initialized());
// Make sure the write concern parses correctly
WriteConcernOptions writeConcern;
Status status = writeConcern.parse(*writeConcernBSON);
if (!status.isOK()) {
return status;
}
return MigrationSecondaryThrottleOptions(secondaryThrottle, std::move(writeConcernBSON));
}
StatusWith<MigrationSecondaryThrottleOptions>
MigrationSecondaryThrottleOptions::createFromBalancerConfig(const BSONObj& obj) {
{
bool isSecondaryThrottle;
Status status =
bsonExtractBooleanField(obj, kSecondaryThrottleMongos, &isSecondaryThrottle);
if (status.isOK()) {
return MigrationSecondaryThrottleOptions::create(isSecondaryThrottle ? kOn : kOff);
} else if (status == ErrorCodes::NoSuchKey) {
return MigrationSecondaryThrottleOptions::create(kDefault);
} else if (status != ErrorCodes::TypeMismatch) {
return status;
}
}
// Try to load it as a BSON document
BSONElement elem;
Status status = bsonExtractTypedField(obj, kSecondaryThrottleMongos, BSONType::Object, &elem);
WriteConcernOptions writeConcern;
Status writeConcernParseStatus = writeConcern.parse(elem.Obj());
if (!writeConcernParseStatus.isOK()) {
return writeConcernParseStatus;
}
return MigrationSecondaryThrottleOptions::createWithWriteConcern(writeConcern);
}
WriteConcernOptions MigrationSecondaryThrottleOptions::getWriteConcern() const {
invariant(_secondaryThrottle != kOff);
invariant(_writeConcernBSON);
WriteConcernOptions writeConcern;
fassertStatusOK(34414, writeConcern.parse(*_writeConcernBSON));
return writeConcern;
}
void MigrationSecondaryThrottleOptions::append(BSONObjBuilder* builder) const {
if (_secondaryThrottle == kDefault) {
return;
}
builder->appendBool(kSecondaryThrottleMongod, _secondaryThrottle == kOn);
if (_secondaryThrottle == kOn && _writeConcernBSON) {
builder->append(kWriteConcern, *_writeConcernBSON);
}
}
BSONObj MigrationSecondaryThrottleOptions::toBSON() const {
BSONObjBuilder builder;
append(&builder);
return builder.obj();
}
bool MigrationSecondaryThrottleOptions::operator==(
const MigrationSecondaryThrottleOptions& other) const {
return toBSON().woCompare(other.toBSON()) == 0;
}
bool MigrationSecondaryThrottleOptions::operator!=(
const MigrationSecondaryThrottleOptions& other) const {
return !(*this == other);
}
} // namespace mongo
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