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/**
* Copyright (C) 2015 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/rpc/metadata.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_time_validator.h"
#include "mongo/rpc/metadata/audit_metadata.h"
#include "mongo/rpc/metadata/client_metadata_ismaster.h"
#include "mongo/rpc/metadata/config_server_metadata.h"
#include "mongo/rpc/metadata/logical_time_metadata.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include "mongo/rpc/metadata/tracking_metadata.h"
#include "mongo/util/string_map.h"
namespace mongo {
namespace rpc {
BSONObj makeEmptyMetadata() {
return BSONObj();
}
void readRequestMetadata(OperationContext* opCtx, const BSONObj& metadataObj) {
BSONElement readPreferenceElem;
BSONElement auditElem;
BSONElement configSvrElem;
BSONElement trackingElem;
BSONElement clientElem;
BSONElement logicalTimeElem;
for (const auto& metadataElem : metadataObj) {
auto fieldName = metadataElem.fieldNameStringData();
if (fieldName == "$readPreference") {
readPreferenceElem = metadataElem;
} else if (fieldName == AuditMetadata::fieldName()) {
auditElem = metadataElem;
} else if (fieldName == ConfigServerMetadata::fieldName()) {
configSvrElem = metadataElem;
} else if (fieldName == ClientMetadata::fieldName()) {
clientElem = metadataElem;
} else if (fieldName == TrackingMetadata::fieldName()) {
trackingElem = metadataElem;
} else if (fieldName == LogicalTimeMetadata::fieldName()) {
logicalTimeElem = metadataElem;
}
}
if (readPreferenceElem) {
ReadPreferenceSetting::get(opCtx) =
uassertStatusOK(ReadPreferenceSetting::fromInnerBSON(readPreferenceElem));
}
AuditMetadata::get(opCtx) = uassertStatusOK(AuditMetadata::readFromMetadata(auditElem));
uassertStatusOK(ClientMetadataIsMasterState::readFromMetadata(opCtx, clientElem));
ConfigServerMetadata::get(opCtx) =
uassertStatusOK(ConfigServerMetadata::readFromMetadata(configSvrElem));
TrackingMetadata::get(opCtx) =
uassertStatusOK(TrackingMetadata::readFromMetadata(trackingElem));
auto logicalClock = LogicalClock::get(opCtx);
if (logicalClock) {
auto logicalTimeMetadata =
uassertStatusOK(rpc::LogicalTimeMetadata::readFromMetadata(logicalTimeElem));
auto& signedTime = logicalTimeMetadata.getSignedTime();
// LogicalTimeMetadata is default constructed if no cluster time metadata was sent, so a
// default constructed SignedLogicalTime should be ignored.
if (signedTime.getTime() != LogicalTime::kUninitialized) {
auto logicalTimeValidator = LogicalTimeValidator::get(opCtx);
if (!LogicalTimeValidator::isAuthorizedToAdvanceClock(opCtx)) {
if (!logicalTimeValidator) {
uasserted(ErrorCodes::CannotVerifyAndSignLogicalTime,
"Cannot accept logicalTime: " + signedTime.getTime().toString() +
". May not be a part of a sharded cluster");
} else {
uassertStatusOK(logicalTimeValidator->validate(opCtx, signedTime));
}
}
uassertStatusOK(logicalClock->advanceClusterTime(signedTime.getTime()));
}
}
}
namespace {
const auto docSequenceFieldsForCommands = StringMap<std::string>{
{"insert", "documents"}, //
{"update", "updates"},
{"delete", "deletes"},
};
bool isArrayOfObjects(BSONElement array) {
if (array.type() != Array)
return false;
for (auto elem : array.Obj()) {
if (elem.type() != Object)
return false;
}
return true;
}
}
OpMsgRequest upconvertRequest(StringData db, BSONObj cmdObj, int queryFlags) {
cmdObj = cmdObj.getOwned(); // Usually this is a no-op since it is already owned.
auto readPrefContainer = BSONObj();
const StringData firstFieldName = cmdObj.firstElementFieldName();
if (firstFieldName == "$query" || firstFieldName == "query") {
// Commands sent over OP_QUERY specify read preference by putting it at the top level and
// putting the command in a nested field called either query or $query.
// Check if legacyCommand has an invalid $maxTimeMS option.
uassert(ErrorCodes::InvalidOptions,
"cannot use $maxTimeMS query option with commands; use maxTimeMS command option "
"instead",
!cmdObj.hasField("$maxTimeMS"));
if (auto readPref = cmdObj["$readPreference"])
readPrefContainer = readPref.wrap();
cmdObj = cmdObj.firstElement().Obj().shareOwnershipWith(cmdObj);
} else if (auto queryOptions = cmdObj["$queryOptions"]) {
// Mongos rewrites commands with $readPreference to put it in a field nested inside of
// $queryOptions. Its command implementations often forward commands in that format to
// shards. This function is responsible for rewriting it to a format that the shards
// understand.
readPrefContainer = queryOptions.Obj().shareOwnershipWith(cmdObj);
cmdObj = cmdObj.removeField("$queryOptions");
}
if (!readPrefContainer.isEmpty()) {
cmdObj = BSONObjBuilder(std::move(cmdObj)).appendElements(readPrefContainer).obj();
} else if (!cmdObj.hasField("$readPreference") && (queryFlags & QueryOption_SlaveOk)) {
BSONObjBuilder bodyBuilder(std::move(cmdObj));
ReadPreferenceSetting(ReadPreference::SecondaryPreferred).toContainingBSON(&bodyBuilder);
cmdObj = bodyBuilder.obj();
}
uassert(40621, "$db is not allowed in OP_QUERY requests", !cmdObj.hasField("$db"));
// Try to move supported array fields into document sequences.
auto docSequenceIt = docSequenceFieldsForCommands.find(cmdObj.firstElementFieldName());
auto docSequenceElem = docSequenceIt == docSequenceFieldsForCommands.end()
? BSONElement()
: cmdObj[docSequenceIt->second];
if (!isArrayOfObjects(docSequenceElem))
return OpMsgRequest::fromDBAndBody(db, std::move(cmdObj));
auto docSequenceName = docSequenceElem.fieldNameStringData();
// Note: removing field before adding "$db" to avoid the need to copy the potentially large
// array.
auto out = OpMsgRequest::fromDBAndBody(db, cmdObj.removeField(docSequenceName));
out.sequences.push_back({docSequenceName.toString()});
for (auto elem : docSequenceElem.Obj()) {
out.sequences[0].objs.push_back(elem.Obj().shareOwnershipWith(cmdObj));
}
return out;
}
} // namespace rpc
} // namespace mongo
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