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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/legacy_reply_builder.h"
#include <iterator>
#include <memory>
#include "mongo/db/dbmessage.h"
#include "mongo/db/jsobj.h"
#include "mongo/rpc/metadata.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include "mongo/s/stale_exception.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
namespace mongo {
namespace rpc {
LegacyReplyBuilder::LegacyReplyBuilder() : LegacyReplyBuilder(Message()) {}
LegacyReplyBuilder::LegacyReplyBuilder(Message&& message) : _message{std::move(message)} {
_builder.skip(sizeof(QueryResult::Value));
}
LegacyReplyBuilder::~LegacyReplyBuilder() {}
LegacyReplyBuilder& LegacyReplyBuilder::setCommandReply(Status nonOKStatus,
BSONObj extraErrorInfo) {
invariant(!_haveCommandReply);
if (nonOKStatus == ErrorCodes::StaleConfig) {
_staleConfigError = true;
// Need to use the special $err format for StaleConfig errors to be backwards
// compatible.
BSONObjBuilder err;
// $err must be the first field in object.
err.append("$err", nonOKStatus.reason());
err.append("code", nonOKStatus.code());
auto const scex = nonOKStatus.extraInfo<StaleConfigInfo>();
scex->serialize(&err);
err.appendElements(extraErrorInfo);
setRawCommandReply(err.done());
} else {
// All other errors proceed through the normal path, which also handles state transitions.
ReplyBuilderInterface::setCommandReply(std::move(nonOKStatus), std::move(extraErrorInfo));
}
return *this;
}
LegacyReplyBuilder& LegacyReplyBuilder::setRawCommandReply(const BSONObj& commandReply) {
invariant(!_haveCommandReply);
_bodyOffset = _builder.len();
commandReply.appendSelfToBufBuilder(_builder);
_haveCommandReply = true;
return *this;
}
BSONObjBuilder LegacyReplyBuilder::getBodyBuilder() {
if (!_haveCommandReply) {
auto bob = BSONObjBuilder(_builder);
_bodyOffset = bob.offset();
_haveCommandReply = true;
return bob;
}
invariant(_bodyOffset);
return BSONObjBuilder(BSONObjBuilder::ResumeBuildingTag{}, _builder, _bodyOffset);
}
Protocol LegacyReplyBuilder::getProtocol() const {
return rpc::Protocol::kOpQuery;
}
void LegacyReplyBuilder::reserveBytes(const std::size_t bytes) {
_builder.reserveBytes(bytes);
_builder.claimReservedBytes(bytes);
}
void LegacyReplyBuilder::reset() {
// If we are in State::kMetadata, we are already in the 'start' state, so by
// immediately returning, we save a heap allocation.
if (!_haveCommandReply) {
return;
}
_builder.reset();
_builder.skip(sizeof(QueryResult::Value));
_message.reset();
_haveCommandReply = false;
_staleConfigError = false;
_bodyOffset = 0;
}
Message LegacyReplyBuilder::done() {
invariant(_haveCommandReply);
QueryResult::View qr = _builder.buf();
if (_staleConfigError) {
// For compatibility with legacy mongos, we need to set this result flag on StaleConfig
qr.setResultFlags(ResultFlag_ErrSet | ResultFlag_ShardConfigStale);
} else {
qr.setResultFlagsToOk();
}
qr.msgdata().setLen(_builder.len());
qr.msgdata().setOperation(opReply);
qr.setCursorId(0);
qr.setStartingFrom(0);
qr.setNReturned(1);
_message.setData(_builder.release());
return std::move(_message);
}
} // namespace rpc
} // namespace mongo
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