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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/command_reply_builder.h"
#include <utility>
#include "mongo/stdx/memory.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/net/message.h"
namespace mongo {
namespace rpc {
CommandReplyBuilder::CommandReplyBuilder() : CommandReplyBuilder(Message{}) {}
CommandReplyBuilder::CommandReplyBuilder(Message&& message) : _message{std::move(message)} {
_builder.skip(mongo::MsgData::MsgDataHeaderSize);
}
CommandReplyBuilder& CommandReplyBuilder::setRawCommandReply(const BSONObj& commandReply) {
invariant(_state == State::kCommandReply);
commandReply.appendSelfToBufBuilder(_builder);
_state = State::kMetadata;
return *this;
}
BufBuilder& CommandReplyBuilder::getInPlaceReplyBuilder() {
invariant(_state == State::kCommandReply);
_state = State::kMetadata;
return _builder;
}
CommandReplyBuilder& CommandReplyBuilder::setMetadata(const BSONObj& metadata) {
invariant(_state == State::kMetadata);
metadata.appendSelfToBufBuilder(_builder);
_state = State::kOutputDocs;
return *this;
}
Status CommandReplyBuilder::addOutputDocs(DocumentRange outputDocs) {
invariant(_state == State::kOutputDocs);
auto rangeData = outputDocs.data();
auto dataSize = rangeData.length();
invariant(_state == State::kOutputDocs);
_builder.appendBuf(rangeData.data(), dataSize);
return Status::OK();
}
Status CommandReplyBuilder::addOutputDoc(const BSONObj& outputDoc) {
invariant(_state == State::kOutputDocs);
outputDoc.appendSelfToBufBuilder(_builder);
return Status::OK();
}
ReplyBuilderInterface::State CommandReplyBuilder::getState() const {
return _state;
}
Protocol CommandReplyBuilder::getProtocol() const {
return rpc::Protocol::kOpCommandV1;
}
void CommandReplyBuilder::reset() {
// If we are in State::kCommandReply, we are already in the 'start' state, so by
// immediately returning, we save a heap allocation.
if (_state == State::kCommandReply) {
return;
}
_builder.reset();
_builder.skip(mongo::MsgData::MsgDataHeaderSize);
_message.reset();
_state = State::kCommandReply;
}
Message CommandReplyBuilder::done() {
invariant(_state == State::kOutputDocs);
MsgData::View msg = _builder.buf();
msg.setLen(_builder.len());
msg.setOperation(dbCommandReply);
_builder.decouple(); // release ownership from BufBuilder
_message.setData(msg.view2ptr(), true); // transfer ownership to Message
_state = State::kDone;
return std::move(_message);
}
} // rpc
} // mongo
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