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/**
* Copyright (C) 2020-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.
*/
#pragma once
#include <memory>
#include "mongo/db/dbmessage.h"
#include "mongo/db/operation_context.h"
#include "mongo/rpc/message.h"
#include "mongo/rpc/op_msg.h"
#include "mongo/rpc/reply_builder_interface.h"
#include "mongo/util/assert_util.h"
namespace mongo {
class Command;
/**
* Captures the execution context for a command to allow safe, shared and asynchronous accesses.
* This class owns all objects that participate in command execution (e.g., `request`). The only
* exceptions are `opCtx` and `command`. The `opCtx` remains valid so long as its corresponding
* client is attached to the executor thread. In case of `command`, it is a global, static
* construct and is safe to be accessed through raw pointers.
* Any access from a client thread that does not own the `opCtx`, or after the `opCtx` is
* released is strictly forbidden.
*/
class RequestExecutionContext {
public:
RequestExecutionContext() = delete;
RequestExecutionContext(const RequestExecutionContext&) = delete;
RequestExecutionContext& operator=(const RequestExecutionContext&) = delete;
RequestExecutionContext(RequestExecutionContext&&) = delete;
RequestExecutionContext& operator=(RequestExecutionContext&&) = delete;
RequestExecutionContext(OperationContext* opCtx, Message message)
: _opCtx(opCtx),
_message(std::move(message)),
_dbmsg(std::make_unique<DbMessage>(_message.get())) {}
auto getOpCtx() const {
invariant(_isOnClientThread());
return _opCtx;
}
const Message& getMessage() const {
invariant(_isOnClientThread() && _message);
return _message.get();
}
DbMessage& getDbMessage() const {
invariant(_isOnClientThread() && _dbmsg);
return *_dbmsg.get();
}
void setRequest(OpMsgRequest request) {
invariant(_isOnClientThread() && !_request);
_request = std::move(request);
}
const OpMsgRequest& getRequest() const {
invariant(_isOnClientThread() && _request);
return _request.get();
}
void setCommand(Command* command) {
invariant(_isOnClientThread() && !_command);
_command = command;
}
Command* getCommand() const {
invariant(_isOnClientThread());
return _command;
}
void setReplyBuilder(std::unique_ptr<rpc::ReplyBuilderInterface> replyBuilder) {
invariant(_isOnClientThread() && !_replyBuilder);
_replyBuilder = std::move(replyBuilder);
}
auto getReplyBuilder() const {
invariant(_isOnClientThread() && _replyBuilder);
return _replyBuilder.get();
}
private:
bool _isOnClientThread() const {
return _opCtx != nullptr && Client::getCurrent() == _opCtx->getClient();
}
OperationContext* const _opCtx;
boost::optional<Message> _message;
std::unique_ptr<DbMessage> _dbmsg;
boost::optional<OpMsgRequest> _request;
Command* _command = nullptr;
std::unique_ptr<rpc::ReplyBuilderInterface> _replyBuilder;
};
} // namespace mongo
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