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511 lines
21 KiB
511 lines
21 KiB
/**
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* @file MySQL_Session.h
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* @brief Declaration of the MySQL_Session class and associated types and enums.
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*/
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#ifdef CLASS_BASE_SESSION_H
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#ifndef __CLASS_MYSQL_SESSION_H
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#define __CLASS_MYSQL_SESSION_H
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#include <functional>
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#include <vector>
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#include "proxysql.h"
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#include "cpp.h"
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#include "MySQL_Variables.h"
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#include "Base_Session.h"
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#ifndef PROXYJSON
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#define PROXYJSON
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#include "../deps/json/json_fwd.hpp"
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#endif // PROXYJSON
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extern class MySQL_Variables mysql_variables;
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/**
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* @enum proxysql_session_type
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* @brief Defines the types of ProxySQL sessions.
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*/
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/*
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enum proxysql_session_type {
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PROXYSQL_SESSION_MYSQL,
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PROXYSQL_SESSION_ADMIN,
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PROXYSQL_SESSION_STATS,
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PROXYSQL_SESSION_SQLITE,
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PROXYSQL_SESSION_CLICKHOUSE,
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PROXYSQL_SESSION_MYSQL_EMU,
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PROXYSQL_SESSION_NONE
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};
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*/
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/**
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* @enum ps_type
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* @brief Defines types for prepared statement handling.
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*/
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enum ps_type : uint8_t {
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ps_type_not_set = 0x0,
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ps_type_prepare_stmt = 0x1,
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ps_type_execute_stmt = 0x2
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};
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//std::string proxysql_session_type_str(enum proxysql_session_type session_type);
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/**
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* @class Query_Info
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* @brief Holds information about a SQL query within a session.
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*
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* This class encapsulates various details about a query such as its text,
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* execution times, affected rows, and more, to facilitate query processing and logging.
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*/
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class Query_Info {
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public:
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SQP_par_t QueryParserArgs;
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MySQL_Session *sess;
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unsigned char *QueryPointer;
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unsigned long long start_time;
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unsigned long long end_time;
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MYSQL_STMT *mysql_stmt;
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stmt_execute_metadata_t *stmt_meta;
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uint64_t stmt_global_id;
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uint64_t stmt_client_id;
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MySQL_STMT_Global_info *stmt_info;
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int QueryLength;
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enum MYSQL_COM_QUERY_command MyComQueryCmd;
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bool bool_is_select_NOT_for_update;
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bool bool_is_select_NOT_for_update_computed;
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bool have_affected_rows; // if affected rows is set, last_insert_id is set too
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uint64_t affected_rows;
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uint64_t last_insert_id;
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uint64_t rows_sent;
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uint64_t waiting_since;
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std::string show_warnings_prev_query_digest;
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Query_Info();
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~Query_Info();
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void init(unsigned char *_p, int len, bool mysql_header=false);
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void query_parser_init();
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enum MYSQL_COM_QUERY_command query_parser_command_type();
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void query_parser_free();
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unsigned long long query_parser_update_counters();
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void begin(unsigned char *_p, int len, bool mysql_header=false);
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void end();
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char *get_digest_text();
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bool is_select_NOT_for_update();
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void set_end_time(unsigned long long time);
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};
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/**
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* @brief Assigns query end time.
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* @details In addition to being a setter for end_time member variable, this
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* method ensures that end_time is always greater than or equal to start_time.
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* Refer https://github.com/sysown/proxysql/issues/4950 for more details.
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* @param time query end time
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*/
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inline void Query_Info::set_end_time(unsigned long long time) {
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end_time = time;
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#ifndef CLOCK_MONOTONIC_RAW
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if (start_time <= end_time)
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return;
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// If start_time is greater than end_time, assign current monotonic time
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end_time = monotonic_time();
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if (start_time <= end_time)
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return;
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// If start_time is still greater than end_time, set the difference to 0
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end_time = start_time;
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#endif // CLOCK_MONOTONIC_RAW
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}
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/**
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* @class MySQL_Session
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* @brief Manages a client session, including query parsing, backend connections, and state transitions.
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*
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* This class is central to ProxySQL's handling of client connections. It manages the lifecycle
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* of a session, processes queries, and communicates with backend MySQL servers.
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*/
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class MySQL_Session: public Base_Session<MySQL_Session, MySQL_Data_Stream, MySQL_Backend, MySQL_Thread>
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{
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private:
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//int handler_ret;
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void handler___status_CONNECTING_CLIENT___STATE_SERVER_HANDSHAKE(PtrSize_t *, bool *);
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void handler___status_CONNECTING_CLIENT___STATE_SERVER_HANDSHAKE_WrongCredentials(PtrSize_t *, bool *);
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// void handler___status_CHANGING_USER_CLIENT___STATE_CLIENT_HANDSHAKE(PtrSize_t *, bool *);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_FIELD_LIST(PtrSize_t *);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_INIT_DB(PtrSize_t *);
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/**
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* @brief Handles 'COM_QUERIES' holding 'USE DB' statements.
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*
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* @param pkt The packet being processed.
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* @param query_digest The query digest returned by the 'QueryProcessor'
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* holding the 'USE' statement without the initial comment.
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*
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* @details NOTE: This function used to be called from 'handler_special_queries'.
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* But since it was change for handling 'USE' statements which are preceded by
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* comments, it's called after 'QueryProcessor' has processed the query.
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*/
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_QUERY_USE_DB(PtrSize_t *pkt);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_PING(PtrSize_t *);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_REFRESH(PtrSize_t *pkt);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_CHANGE_USER(PtrSize_t *, bool *);
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/**
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* @brief Handles the command 'COM_RESET_CONNECTION'.
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* @param pkt Pointer to packet received holding the 'COM_RESET_CONNECTION'.
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* @details 'COM_RESET_CONNECTION' command is currently supported only for 'sesssion_types':
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* - 'PROXYSQL_SESSION_MYSQL'.
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* - 'PROXYSQL_SESSION_SQLITE'.
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* If the command is received for other sessions, the an error packet with error '1047' is sent to the
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* client. If the session is supported, it performs the following operations over the current session:
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* 1. Store the current relevent session variables to be recovered after the 'RESET'.
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* 2. Perform a reset and initialization of current session.
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* 3. Recover the relevant session variables and other initial state associated with the current session
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* user.
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* 4. Respond to client with 'OK' packet.
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*/
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_RESET_CONNECTION(PtrSize_t *pkt);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_SET_OPTION(PtrSize_t *);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_STATISTICS(PtrSize_t *);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_PROCESS_KILL(PtrSize_t *);
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bool handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_QUERY_qpo(PtrSize_t *, bool *lock_hostgroup, ps_type prepare_stmt_type=ps_type_not_set);
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void handler___client_DSS_QUERY_SENT___server_DSS_NOT_INITIALIZED__get_connection();
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//void return_proxysql_internal(PtrSize_t *);
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bool handler_special_queries(PtrSize_t *);
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//bool handler_special_queries_STATUS(PtrSize_t *);
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/**
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* @brief Handles 'COMMIT|ROLLBACK' commands.
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* @details Forwarding the packet is required when there are active transactions. Since we are limited to
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* forwarding just one 'COMMIT|ROLLBACK', we work under the assumption that we only have one active
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* transaction. If more transactions are simultaneously open for the session, more 'COMMIT|ROLLBACK'.
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* commands are required to be issued by the client, so they could be forwarded to the corresponding
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* backend connections.
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* @param The received packet to be handled.
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* @return 'true' if the packet is intercepted and never forwarded to the client, 'false' otherwise.
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*/
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bool handler_CommitRollback(PtrSize_t *);
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bool handler_SetAutocommit(PtrSize_t *);
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/**
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* @brief Should execute most of the commands executed when a request is finalized.
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* @details Cleanup of current session state, and required operations to the supplied 'MySQL_Data_Stream'
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* for further queries processing. Takes care of the following actions:
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* - Update the status of the backend connection (if supplied), with previous query actions.
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* - Log the query for the required statuses.
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* - Cleanup the previous Query_Processor output.
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* - Free the resources of the backend connection (if supplied).
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* - Reset all the required session status flags. E.g:
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* + status
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* + client_myds::DSS
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* + started_sending_data_to_client
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* + previous_hostgroup
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* NOTE: Should become the place to hook other functions.
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* @param myds If not null, should point to a MySQL_Data_Stream (backend connection) which connection status
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* should be updated, and previous query resources cleanup.
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*/
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void RequestEnd(MySQL_Data_Stream * myds, const unsigned int myerrno = 0, const char * errmsg = nullptr);
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void LogQuery(MySQL_Data_Stream * myds, const unsigned int myerrno = 0, const char * errmsg = nullptr);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_QUERY___create_mirror_session();
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int handler_again___status_PINGING_SERVER();
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int handler_again___status_RESETTING_CONNECTION();
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bool handler_again___status_SHOW_WARNINGS(MySQL_Data_Stream *, bool);
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void handler_again___new_thread_to_kill_connection();
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void handler_KillConnectionIfNeeded();
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bool handler_again___verify_init_connect();
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bool handler_again___verify_ldap_user_variable();
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bool handler_again___verify_backend_autocommit();
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bool handler_again___verify_backend_session_track_gtids();
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bool handler_again___verify_backend_multi_statement();
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bool handler_again___verify_backend_user_schema();
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bool handler_again___verify_multiple_variables(MySQL_Connection *);
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bool handler_again___status_SETTING_INIT_CONNECT(int *);
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bool handler_again___status_SETTING_LDAP_USER_VARIABLE(int *);
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bool handler_again___status_SETTING_SQL_MODE(int *);
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bool handler_again___status_SETTING_SESSION_TRACK_GTIDS(int *);
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bool handler_again___status_CHANGING_CHARSET(int *_rc);
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bool handler_again___status_CHANGING_SCHEMA(int *);
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bool handler_again___status_CONNECTING_SERVER(int *);
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bool handler_again___status_CHANGING_USER_SERVER(int *);
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bool handler_again___status_CHANGING_AUTOCOMMIT(int *);
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bool handler_again___status_SETTING_MULTI_STMT(int *_rc);
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bool handler_again___multiple_statuses(int *rc);
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//void init();
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void reset();
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void add_ldap_comment_to_pkt(PtrSize_t *);
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#if 0
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/**
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* @brief Performs the required housekeeping operations over the session and its connections before
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* performing any processing on received client packets.
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*/
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void housekeeping_before_pkts();
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#endif // 0
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int get_pkts_from_client(bool&, PtrSize_t&);
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// GPFC_ functions are subfunctions of get_pkts_from_client()
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int GPFC_Statuses2(bool&, PtrSize_t&);
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void GPFC_DetectedMultiPacket_SetDDS();
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int GPFC_WaitingClientData_FastForwardSession(PtrSize_t&);
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void GPFC_PreparedStatements(PtrSize_t&, unsigned char);
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int GPFC_Replication_SwitchToFastForward(PtrSize_t&, unsigned char);
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bool GPFC_QueryUSE(PtrSize_t&, int&);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_STMT_RESET(PtrSize_t&);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_STMT_CLOSE(PtrSize_t&);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_STMT_SEND_LONG_DATA(PtrSize_t&);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_STMT_PREPARE(PtrSize_t& pkt);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_STMT_EXECUTE(PtrSize_t& pkt);
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// these functions have code that used to be inline, and split into functions for readibility
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int handler_ProcessingQueryError_CheckBackendConnectionStatus(MySQL_Data_Stream *myds);
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void SetQueryTimeout();
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bool handler_rc0_PROCESSING_STMT_PREPARE(enum session_status& st, MySQL_Data_Stream *myds, bool& prepared_stmt_with_no_params);
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void handler_rc0_PROCESSING_STMT_EXECUTE(MySQL_Data_Stream *myds);
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bool handler_minus1_ClientLibraryError(MySQL_Data_Stream *myds, int myerr, char **errmsg);
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void handler_minus1_LogErrorDuringQuery(MySQL_Connection *myconn, int myerr, char *errmsg);
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bool handler_minus1_HandleErrorCodes(MySQL_Data_Stream *myds, int myerr, char **errmsg, int& handler_ret);
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void handler_minus1_GenerateErrorMessage(MySQL_Data_Stream *myds, MySQL_Connection *myconn, bool& wrong_pass);
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void handler_minus1_HandleBackendConnection(MySQL_Data_Stream *myds, MySQL_Connection *myconn);
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int RunQuery(MySQL_Data_Stream *myds, MySQL_Connection *myconn);
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void handler___status_WAITING_CLIENT_DATA();
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void handler_rc0_Process_GTID(MySQL_Connection *myconn);
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void handler_rc0_RefreshActiveTransactions(MySQL_Connection* myconn);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_INIT_DB_replace_CLICKHOUSE(PtrSize_t& pkt);
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void handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_QUERY___not_mysql(PtrSize_t& pkt);
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bool handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM_QUERY_detect_SQLi();
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bool handler___status_WAITING_CLIENT_DATA___STATE_SLEEP_MULTI_PACKET(PtrSize_t& pkt);
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bool handler___status_WAITING_CLIENT_DATA___STATE_SLEEP___MYSQL_COM__various(PtrSize_t* pkt, bool* wrong_pass);
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void handler___status_WAITING_CLIENT_DATA___default();
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void handler___status_NONE_or_default(PtrSize_t& pkt);
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void handler_WCD_SS_MCQ_qpo_QueryRewrite(PtrSize_t *pkt);
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void handler_WCD_SS_MCQ_qpo_OK_msg(PtrSize_t *pkt);
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void handler_WCD_SS_MCQ_qpo_error_msg(PtrSize_t *pkt);
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void handler_WCD_SS_MCQ_qpo_LargePacket(PtrSize_t *pkt);
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public:
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bool handler_again___status_SETTING_GENERIC_VARIABLE(int *_rc, const char *var_name, const char *var_value, bool no_quote=false, bool set_transaction=false);
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bool handler_again___status_SETTING_SQL_LOG_BIN(int *);
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std::stack<enum session_status> previous_status;
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Query_Info CurrentQuery;
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PtrSize_t mirrorPkt;
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PtrSize_t pkt;
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#if 0
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// uint64_t
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unsigned long long start_time;
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unsigned long long pause_until;
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unsigned long long idle_since;
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unsigned long long transaction_started_at;
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// pointers
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MySQL_Thread *thread;
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#endif // 0
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MySQL_Query_Processor_Output *qpo;
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StatCounters *command_counters;
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#if 0
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MySQL_Backend *mybe;
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PtrArray *mybes;
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MySQL_Data_Stream *client_myds;
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#endif // 0
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MySQL_Data_Stream *server_myds;
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#if 0
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/*
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* @brief Store the hostgroups that hold connections that have been flagged as 'expired' by the
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* maintenance thread. These values will be used to release the retained connections in the specific
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* hostgroups in housekeeping operations, before client packet processing. Currently 'housekeeping_before_pkts'.
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*/
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std::vector<int32_t> hgs_expired_conns {};
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char * default_schema;
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char * user_attributes;
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//this pointer is always initialized inside handler().
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// it is an attempt to start simplifying the complexing of handler()
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uint32_t thread_session_id;
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unsigned long long last_insert_id;
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int last_HG_affected_rows;
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enum session_status status;
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int healthy;
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int user_max_connections;
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int current_hostgroup;
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int default_hostgroup;
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int previous_hostgroup;
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/**
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* @brief Charset directly specified by the client. Supplied and updated via 'HandshakeResponse'
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* and 'COM_CHANGE_USER' packets.
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* @details Used when session needs to be restored via 'COM_RESET_CONNECTION'.
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*/
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int default_charset;
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int locked_on_hostgroup;
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int next_query_flagIN;
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int mirror_hostgroup;
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int mirror_flagOUT;
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unsigned int active_transactions;
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int transaction_persistent_hostgroup;
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int to_process;
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enum proxysql_session_type session_type;
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// bool
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bool autocommit;
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bool autocommit_handled;
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bool sending_set_autocommit;
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bool killed;
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bool locked_on_hostgroup_and_all_variables_set;
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//bool admin;
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bool max_connections_reached;
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bool client_authenticated;
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bool connections_handler;
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bool mirror;
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//bool stats;
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bool schema_locked;
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bool transaction_persistent;
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bool session_fast_forward;
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//bool started_sending_data_to_client; // this status variable tracks if some result set was sent to the client, or if proxysql is still buffering everything
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bool use_ssl;
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#endif // 0
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int warning_in_hg;
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int autocommit_on_hostgroup;
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/**
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* @brief This status variable tracks whether the session is performing an
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* 'Auth Switch' due to a 'COM_CHANGE_USER' packet.
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* @details It becomes 'true' when the packet is detected and processed by:
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* - 'MySQL_Protocol::process_pkt_COM_CHANGE_USER'
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* It's reset before sending the final response for 'Auth Switch' to the client by:
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* - 'MySQL_Session::handler___status_CONNECTING_CLIENT___STATE_SERVER_HANDSHAKE'
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* This flag was introduced for issue #3504.
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*/
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bool change_user_auth_switch;
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bool with_gtid;
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char gtid_buf[128];
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//uint64_t gtid_trxid;
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int gtid_hid;
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MySQL_STMTs_meta *sess_STMTs_meta;
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StmtLongDataHandler *SLDH;
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Session_Regex **match_regexes;
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ProxySQL_Node_Address * proxysql_node_address; // this is used ONLY for Admin, and only if the other party is another proxysql instance part of a cluster
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bool use_ldap_auth;
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// this variable is relevant only if status == SETTING_VARIABLE
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enum mysql_variable_name changing_variable_idx;
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MySQL_Session();
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~MySQL_Session();
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//void set_unhealthy();
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void set_status(enum session_status e);
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int handler();
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void (*handler_function) (MySQL_Session* sess, void *, PtrSize_t *pkt);
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//MySQL_Backend * find_backend(int);
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//MySQL_Backend * create_backend(int, MySQL_Data_Stream *_myds=NULL);
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//MySQL_Backend * find_or_create_backend(int, MySQL_Data_Stream *_myds=NULL);
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void SQLite3_to_MySQL(SQLite3_result *, char *, int , MySQL_Protocol *, bool in_transaction=false, bool deprecate_eof_active=false) override;
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void MySQL_Result_to_MySQL_wire(MYSQL *mysql, MySQL_ResultSet *MyRS, unsigned int warning_count, MySQL_Data_Stream *_myds=NULL);
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void MySQL_Stmt_Result_to_MySQL_wire(MYSQL_STMT *stmt, MySQL_Connection *myconn);
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//unsigned int NumActiveTransactions(bool check_savpoint=false);
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//bool HasOfflineBackends();
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//bool SetEventInOfflineBackends();
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/**
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* @brief Finds one active transaction in the current backend connections.
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* @details Since only one connection is returned, if the session holds multiple backend connections with
|
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* potential transactions, the priority is:
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* 1. Connections flagged with 'SERVER_STATUS_IN_TRANS', or 'autocommit=0' in combination with
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* 'autocommit_false_is_transaction'.
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* 2. Connections with 'autocommit=0' holding a 'SAVEPOINT'.
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* 3. Connections with 'unknown transaction status', e.g: connections with errors.
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* @param check_savepoint Used to also check for connections holding savepoints. See MySQL bug
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* https://bugs.mysql.com/bug.php?id=107875.
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* @returns The hostgroup in which the connection was found, -1 in case no connection is found.
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|
*/
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//int FindOneActiveTransaction(bool check_savepoint=false);
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unsigned long long IdleTime();
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|
|
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//void reset_all_backends();
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//void writeout();
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|
void Memory_Stats();
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void create_new_session_and_reset_connection(MySQL_Data_Stream *_myds) override;
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bool handle_command_query_kill(PtrSize_t *);
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//void update_expired_conns(const std::vector<std::function<bool(MySQL_Connection*)>>&);
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|
/**
|
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* @brief Performs the final operations after current query has finished to be executed. It updates the session
|
|
* 'transaction_persistent_hostgroup', and updates the 'MySQL_Data_Stream' and 'MySQL_Connection' before
|
|
* returning the connection back to the connection pool. After this operation the session should be ready
|
|
* for handling new client connections.
|
|
*
|
|
* @param myds The 'MySQL_Data_Stream' which status should be updated.
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|
* @param myconn The 'MySQL_Connection' which status should be updated, and which should be returned to
|
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* the connection pool.
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|
* @param prepared_stmt_with_no_params specifies if the processed query was a prepared statement with no
|
|
* params.
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|
*/
|
|
void finishQuery(MySQL_Data_Stream *myds, MySQL_Connection *myconn, bool);
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|
void generate_proxysql_internal_session_json(nlohmann::json &) override;
|
|
bool known_query_for_locked_on_hostgroup(uint64_t);
|
|
void unable_to_parse_set_statement(bool *);
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|
//bool has_any_backend();
|
|
void detected_broken_connection(const char *file, unsigned int line, const char *func, const char *action, MySQL_Connection *myconn, int myerr, const char *message, bool verbose=false);
|
|
void generate_status_one_hostgroup(int hid, std::string& s);
|
|
void reset_warning_hostgroup_flag_and_release_connection();
|
|
void set_previous_status_mode3(bool allow_execute=true);
|
|
char* get_current_query(int max_length = -1);
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|
|
|
friend void SQLite3_Server_session_handler(MySQL_Session*, void *_pa, PtrSize_t *pkt);
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|
|
|
#if defined(__clang__)
|
|
template<typename SESS, typename DS, typename BE, typename THD>
|
|
friend class Base_Session;
|
|
#else
|
|
friend class Base_Session<MySQL_Session, MySQL_Data_Stream, MySQL_Backend, MySQL_Thread>;
|
|
#endif
|
|
};
|
|
|
|
#define KILL_QUERY 1
|
|
#define KILL_CONNECTION 2
|
|
|
|
class KillArgs {
|
|
public:
|
|
MySQL_Thread *mt;
|
|
char *username;
|
|
char *password;
|
|
char *hostname;
|
|
unsigned int port;
|
|
unsigned long id;
|
|
int kill_type;
|
|
unsigned int hid;
|
|
int use_ssl;
|
|
|
|
KillArgs(char* u, char* p, char* h, unsigned int P, unsigned int _hid, unsigned long i, int kt, int _use_ssl, MySQL_Thread* _mt);
|
|
KillArgs(char *u, char *p, char *h, unsigned int P, unsigned int _hid, unsigned long i, int kt, int _use_ssl, MySQL_Thread* _mt, char *ip);
|
|
~KillArgs();
|
|
const char* get_host_address() const;
|
|
|
|
private:
|
|
char* ip_addr;
|
|
};
|
|
|
|
void * kill_query_thread(void *arg);
|
|
|
|
#endif /* __CLASS_MYSQL_SESSION_ H */
|
|
#endif // CLASS_BASE_SESSION_H
|