84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/*
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* Copyright (c) 2019 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2026-01-04
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#pragma once
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#include <maxscale/ccdefs.hh>
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struct GWBUF;
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namespace maxsql
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{
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class ComResponse;
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// TODO add documentation
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class PacketTracker
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{
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public:
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// The State reflects the response status. For the unlikely event that the query is split, but
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// no response is expected, the tracker may still be waiting for packets from the client while
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// m_state = Done. The function expecting_more_packets() would return true in this case.
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// TODO, maybe, rename to ResponseState.
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enum class State {FirstPacket, Field, FieldEof, Row,
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ComFieldList, ComStatistics, ComStmtFetch,
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Done, ErrorPacket, Error};
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PacketTracker() = default;
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explicit PacketTracker(GWBUF* pQuery); // Track this query
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PacketTracker(const PacketTracker&) = delete;
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PacketTracker& operator=(const PacketTracker&) = delete;
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PacketTracker(PacketTracker&&) = default;
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PacketTracker& operator=(PacketTracker&&) = default;
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bool update_request(GWBUF* pPacket); // Updates the query (must be a split packet)
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void update_response(GWBUF* pPacket); // Update as response packets are received.
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bool expecting_request_packets() const;
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bool expecting_response_packets() const;
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bool expecting_more_packets() const;
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State state() const;
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private:
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// State functions.
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State first_packet(const ComResponse& response);
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State field(const ComResponse& response);
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State field_eof(const ComResponse& response);
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State row(const ComResponse& response);
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State com_field_list(const ComResponse& response);
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State com_statistics(const ComResponse& response);
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State com_stmt_fetch(const ComResponse& response);
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State expect_no_response_packets(const ComResponse& response); // states: Done, ErrorPacket, Error
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State m_state = State::Error;
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bool m_client_com_packet_internal = false;
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bool m_server_com_packet_internal = false;
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bool m_expect_more_split_query_packets = false;
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int m_command;
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int m_total_fields;
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int m_field_count;
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};
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inline PacketTracker::State PacketTracker::state() const
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{
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return m_state;
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}
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std::ostream& operator<<(std::ostream&, PacketTracker::State state);
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}
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