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Reorganize MariaDBServer code

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The server-class keeps growing, so the additional classes are moved out of
the main class file.
This commit is contained in:
Esa Korhonen
2018-10-04 17:56:49 +03:00
parent 7e7ee3e180
commit 68d65682b5
10 changed files with 548 additions and 547 deletions
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322
server/modules/monitor/mariadbmon/server_utils.hh Normal file
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/*
* Copyright (c) 2018 MariaDB Corporation Ab
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
*
* Change Date: 2022-01-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2 or later of the General
* Public License.
*/
#pragma once
#include "mariadbmon_common.hh"
#include <string>
#include <vector>
#include <maxbase/stopwatch.hh>
#include <maxscale/mysql_utils.h>
class MariaDBServer;
/**
* Class which encapsulates a gtid (one domain-server_id-sequence combination)
*/
class Gtid
{
public:
/**
* Constructs an invalid Gtid.
*/
Gtid();
/**
* Constructs a gtid with given values. The values are not checked.
*
* @param domain Domain
* @param server_id Server id
* @param sequence Sequence
*/
Gtid(uint32_t domain, int64_t server_id, uint64_t sequence);
/**
* Parse one gtid from null-terminated string. Handles multi-domain gtid:s properly. Should be called
* repeatedly for a multi-domain gtid string by giving the value of @c endptr as @c str.
*
* @param str First number of a gtid in a gtid-string
* @param endptr A pointer to save the position at after the last parsed character.
* @return A new gtid. If an error occurs, the server_id of the returned triplet is -1.
*/
static Gtid from_string(const char* str, char** endptr);
bool eq(const Gtid& rhs) const;
std::string to_string() const;
/**
* Comparator, used when sorting by domain id.
*
* @param lhs Left side
* @param rhs Right side
* @return True if lhs should be before rhs
*/
static bool compare_domains(const Gtid& lhs, const Gtid& rhs)
{
return lhs.m_domain < rhs.m_domain;
}
uint32_t m_domain;
int64_t m_server_id; // Valid values are 32bit unsigned. 0 is only used by server versions <= 10.1
uint64_t m_sequence;
};
inline bool operator==(const Gtid& lhs, const Gtid& rhs)
{
return lhs.eq(rhs);
}
/**
* Class which encapsulates a list of gtid:s (e.g. 1-2-3,2-2-4). Server variables such as gtid_binlog_pos
* are GtidLists. */
class GtidList
{
public:
// Used with events_ahead()
enum substraction_mode_t
{
MISSING_DOMAIN_IGNORE,
MISSING_DOMAIN_LHS_ADD
};
/**
* Parse the gtid string and return an object. Orders the triplets by domain id.
*
* @param gtid_string gtid as given by server. String must not be empty.
* @return The parsed (possibly multidomain) gtid. In case of error, the gtid will be empty.
*/
static GtidList from_string(const std::string& gtid_string);
/**
* Return a string version of the gtid list.
*
* @return A string similar in form to how the server displays gtid:s
*/
std::string to_string() const;
/**
* Check if a server with this gtid can replicate from a master with a given gtid. Only considers
* gtid:s and only detects obvious errors. The non-detected errors will mostly be detected once
* the slave tries to start replicating.
*
* TODO: Add support for Replicate_Do/Ignore_Id:s
*
* @param master_gtid Master server gtid
* @return True if replication looks possible
*/
bool can_replicate_from(const GtidList& master_gtid);
/**
* Is the gtid empty.
*
* @return True if gtid has 0 triplets
*/
bool empty() const;
/**
* Full comparison.
*
* @param rhs Other gtid
* @return True if both gtid:s have identical triplets or both are empty
*/
bool operator==(const GtidList& rhs) const;
/**
* Calculate the number of events this GtidList is ahead of the given GtidList. The
* result is always 0 or greater: if a sequence number of a domain on rhs is greater than on the same
* domain on the calling GtidList, the sequences are considered identical. Missing domains are
* handled depending on the value of @c domain_substraction_mode.
*
* @param rhs The value doing the substracting
* @param domain_substraction_mode How domains that exist on the caller but not on @c rhs are handled.
* If MISSING_DOMAIN_IGNORE, these are simply ignored. If MISSING_DOMAIN_LHS_ADD,
* the sequence number on lhs is added to the total difference.
* @return The number of events between the two gtid:s
*/
uint64_t events_ahead(const GtidList& rhs, substraction_mode_t domain_substraction_mode) const;
/**
* Return an individual gtid with the given domain.
*
* @param domain Which domain to search for
* @return The gtid within the list. If domain is not found, an invalid gtid is returned.
*/
Gtid get_gtid(uint32_t domain) const;
private:
std::vector<Gtid> m_triplets;
};
// Contains data returned by one row of SHOW ALL SLAVES STATUS
class SlaveStatus
{
public:
enum slave_io_running_t
{
SLAVE_IO_YES,
SLAVE_IO_CONNECTING,
SLAVE_IO_NO,
};
bool exists = true; /* Has this connection been removed from the
* server but the monitor hasn't updated yet? */
bool seen_connected = false; /* Has this slave connection been seen connected,
* meaning that the master server id is correct?
**/
std::string name; /* Slave connection name. Must be unique for
* the server.*/
int64_t master_server_id = SERVER_ID_UNKNOWN; /* The master's server_id value. Valid ids are
* 32bit unsigned. -1 is unread/error. */
std::string master_host; /* Master server host name. */
int master_port = PORT_UNKNOWN; /* Master server port. */
slave_io_running_t slave_io_running = SLAVE_IO_NO; /* Slave I/O thread running state: * "Yes",
* "Connecting" or "No" */
bool slave_sql_running = false; /* Slave SQL thread running state, true if "Yes"
* */
GtidList gtid_io_pos; /* Gtid I/O position of the slave thread. */
std::string last_error; /* Last IO or SQL error encountered. */
int seconds_behind_master = MXS_RLAG_UNDEFINED; /* How much behind the slave is. */
int64_t received_heartbeats = 0; /* How many heartbeats the connection has received
* */
/* Time of the latest gtid event or heartbeat the slave connection has received, timed by the monitor. */
maxbase::Clock::time_point last_data_time = maxbase::Clock::now();
std::string to_string() const;
json_t* to_json() const;
std::string to_short_string(const std::string& owner) const;
static slave_io_running_t slave_io_from_string(const std::string& str);
static std::string slave_io_to_string(slave_io_running_t slave_io);
};
enum class OperationType
{
SWITCHOVER,
FAILOVER
};
/**
* Class which encapsulates many settings and status descriptors for a failover/switchover.
* Is more convenient to pass around than the separate elements. Most fields are constants or constant
* pointers since they should not change during an operation.
*/
class ClusterOperation
{
private:
ClusterOperation(const ClusterOperation&) = delete;
ClusterOperation& operator=(const ClusterOperation&) = delete;
public:
const OperationType type; // Failover or switchover
MariaDBServer* const promotion_target; // Which server will be promoted
MariaDBServer* const demotion_target; // Which server will be demoted
const bool demotion_target_is_master; // Was the demotion target the master?
const bool handle_events; // Should scheduled server events be disabled/enabled?
const std::string promotion_sql_file; // SQL commands ran on a server promoted to master
const std::string demotion_sql_file; // SQL commands ran on a server demoted from master
const std::string replication_user; // User for CHANGE MASTER TO ...
const std::string replication_password; // Password for CHANGE MASTER TO ...
json_t** const error_out; // Json error output
maxbase::Duration time_remaining; // How much time remains to complete the operation
ClusterOperation(OperationType type,
MariaDBServer* promotion_target, MariaDBServer* demotion_target,
bool demo_target_is_master, bool handle_events,
std::string& promotion_sql_file, std::string& demotion_sql_file,
std::string& replication_user, std::string& replication_password,
json_t** error, maxbase::Duration time_remaining);
};
/**
* Helper class for simplifying working with resultsets. Used in MariaDBServer.
*/
class QueryResult
{
// These need to be banned to avoid premature destruction.
QueryResult(const QueryResult&) = delete;
QueryResult& operator=(const QueryResult&) = delete;
public:
QueryResult(MYSQL_RES* resultset = NULL);
~QueryResult();
/**
* Advance to next row. Affects all result returning functions.
*
* @return True if the next row has data, false if the current row was the last one.
*/
bool next_row();
/**
* Get the index of the current row.
*
* @return Current row index, or -1 if no data or next_row() has not been called yet.
*/
int64_t get_current_row_index() const;
/**
* How many columns the result set has.
*
* @return Column count, or -1 if no data.
*/
int64_t get_col_count() const;
/**
* How many rows does the result set have?
*
* @return The number of rows or -1 on error
*/
int64_t get_row_count() const;
/**
* Get a numeric index for a column name. May give wrong results if column names are not unique.
*
* @param col_name Column name
* @return Index or -1 if not found.
*/
int64_t get_col_index(const std::string& col_name) const;
/**
* Read a string value from the current row and given column. Empty string and (null) are both interpreted
* as the empty string.
*
* @param column_ind Column index
* @return Value as string
*/
std::string get_string(int64_t column_ind) const;
/**
* Read a non-negative integer value from the current row and given column.
*
* @param column_ind Column index
* @return Value as integer. 0 or greater indicates success, -1 is returned on error.
*/
int64_t get_uint(int64_t column_ind) const;
/**
* Read a boolean value from the current row and given column.
*
* @param column_ind Column index
* @return Value as boolean. Returns true if the text is either 'Y' or '1'.
*/
bool get_bool(int64_t column_ind) const;
private:
MYSQL_RES* m_resultset = NULL; // Underlying result set, freed at dtor.
std::unordered_map<std::string, int64_t> m_col_indexes; // Map of column name -> index
MYSQL_ROW m_rowdata = NULL; // Data for current row
int64_t m_current_row_ind = -1;// Index of current row
};