324 lines
11 KiB
C++
324 lines
11 KiB
C++
/*
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* Copyright (c) 2018 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: 2022-01-01
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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 "mariadbmon_common.hh"
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#include <string>
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#include <vector>
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#include <maxbase/stopwatch.hh>
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#include <maxscale/mysql_utils.hh>
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class MariaDBServer;
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/**
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* Class which encapsulates a gtid (one domain-server_id-sequence combination)
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*/
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class Gtid
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{
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public:
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/**
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* Constructs an invalid Gtid.
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*/
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Gtid();
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/**
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* Constructs a gtid with given values. The values are not checked.
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*
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* @param domain Domain
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* @param server_id Server id
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* @param sequence Sequence
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*/
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Gtid(uint32_t domain, int64_t server_id, uint64_t sequence);
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/**
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* Parse one gtid from null-terminated string. Handles multi-domain gtid:s properly. Should be called
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* repeatedly for a multi-domain gtid string by giving the value of @c endptr as @c str.
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*
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* @param str First number of a gtid in a gtid-string
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* @param endptr A pointer to save the position at after the last parsed character.
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* @return A new gtid. If an error occurs, the server_id of the returned triplet is -1.
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*/
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static Gtid from_string(const char* str, char** endptr);
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bool eq(const Gtid& rhs) const;
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std::string to_string() const;
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/**
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* Comparator, used when sorting by domain id.
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*
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* @param lhs Left side
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* @param rhs Right side
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* @return True if lhs should be before rhs
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*/
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static bool compare_domains(const Gtid& lhs, const Gtid& rhs)
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{
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return lhs.m_domain < rhs.m_domain;
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}
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uint32_t m_domain;
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int64_t m_server_id; // Valid values are 32bit unsigned. 0 is only used by server versions <= 10.1
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uint64_t m_sequence;
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};
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inline bool operator==(const Gtid& lhs, const Gtid& rhs)
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{
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return lhs.eq(rhs);
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}
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/**
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* Class which encapsulates a list of gtid:s (e.g. 1-2-3,2-2-4). Server variables such as gtid_binlog_pos
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* are GtidLists. */
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class GtidList
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{
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public:
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// Used with events_ahead()
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enum substraction_mode_t
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{
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MISSING_DOMAIN_IGNORE,
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MISSING_DOMAIN_LHS_ADD
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};
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/**
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* Parse the gtid string and return an object. Orders the triplets by domain id.
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*
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* @param gtid_string gtid as given by server. String must not be empty.
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* @return The parsed (possibly multidomain) gtid. In case of error, the gtid will be empty.
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*/
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static GtidList from_string(const std::string& gtid_string);
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/**
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* Return a string version of the gtid list.
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*
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* @return A string similar in form to how the server displays gtid:s
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*/
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std::string to_string() const;
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/**
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* Check if a server with this gtid can replicate from a master with a given gtid. Only considers
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* gtid:s and only detects obvious errors. The non-detected errors will mostly be detected once
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* the slave tries to start replicating.
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*
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* TODO: Add support for Replicate_Do/Ignore_Id:s
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*
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* @param master_gtid Master server gtid
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* @return True if replication looks possible
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*/
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bool can_replicate_from(const GtidList& master_gtid);
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/**
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* Is the gtid empty.
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*
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* @return True if gtid has 0 triplets
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*/
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bool empty() const;
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/**
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* Full comparison.
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*
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* @param rhs Other gtid
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* @return True if both gtid:s have identical triplets or both are empty
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*/
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bool operator==(const GtidList& rhs) const;
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/**
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* Calculate the number of events this GtidList is ahead of the given GtidList. The
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* result is always 0 or greater: if a sequence number of a domain on rhs is greater than on the same
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* domain on the calling GtidList, the sequences are considered identical. Missing domains are
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* handled depending on the value of @c domain_substraction_mode.
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*
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* @param rhs The value doing the substracting
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* @param domain_substraction_mode How domains that exist on the caller but not on @c rhs are handled.
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* If MISSING_DOMAIN_IGNORE, these are simply ignored. If MISSING_DOMAIN_LHS_ADD,
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* the sequence number on lhs is added to the total difference.
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* @return The number of events between the two gtid:s
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*/
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uint64_t events_ahead(const GtidList& rhs, substraction_mode_t domain_substraction_mode) const;
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/**
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* Return an individual gtid with the given domain.
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*
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* @param domain Which domain to search for
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* @return The gtid within the list. If domain is not found, an invalid gtid is returned.
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*/
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Gtid get_gtid(uint32_t domain) const;
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private:
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std::vector<Gtid> m_triplets;
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};
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// Contains data returned by one row of SHOW ALL SLAVES STATUS
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class SlaveStatus
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{
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public:
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enum slave_io_running_t
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{
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SLAVE_IO_YES,
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SLAVE_IO_CONNECTING,
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SLAVE_IO_NO,
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};
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std::string owning_server; /* Server name of the owner */
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bool seen_connected = false; /* Has this slave connection been seen connected,
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* meaning that the master server id is correct? */
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std::string name; /* Slave connection name. Must be unique for
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* the server.*/
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int64_t master_server_id = SERVER_ID_UNKNOWN; /* The master's server_id value. Valid ids are
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* 32bit unsigned. -1 is unread/error. */
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std::string master_host; /* Master server host name. */
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int master_port = PORT_UNKNOWN; /* Master server port. */
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slave_io_running_t slave_io_running = SLAVE_IO_NO; /* Slave I/O thread running state: * "Yes",
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* "Connecting" or "No" */
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bool slave_sql_running = false; /* Slave SQL thread running state, true if "Yes" */
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GtidList gtid_io_pos; /* Gtid I/O position of the slave thread. */
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std::string last_error; /* Last IO or SQL error encountered. */
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int64_t received_heartbeats = 0; /* How many heartbeats the connection has
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* received */
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int seconds_behind_master = SERVER::RLAG_UNDEFINED; /* How much behind the slave is. */
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/* Time of the latest gtid event or heartbeat the slave connection has received, timed by the monitor. */
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maxbase::Clock::time_point last_data_time = maxbase::Clock::now();
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std::string to_string() const;
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json_t* to_json() const;
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/**
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* Create a short description in the form of "Slave connection from <slave> to <master>"
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*
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* @return Description
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*/
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std::string to_short_string() const;
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static slave_io_running_t slave_io_from_string(const std::string& str);
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static std::string slave_io_to_string(slave_io_running_t slave_io);
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bool should_be_copied(std::string* ignore_reason_out) const;
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};
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typedef std::vector<SlaveStatus> SlaveStatusArray;
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enum class OperationType
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{
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SWITCHOVER,
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FAILOVER
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};
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class GeneralOpData
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{
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public:
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const std::string replication_user; // User for CHANGE MASTER TO ...
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const std::string replication_password; // Password for CHANGE MASTER TO ...
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json_t** const error_out; // Json error output
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maxbase::Duration time_remaining; // How much time remains to complete the operation
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GeneralOpData(const std::string& replication_user, const std::string& replication_password,
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json_t** error, maxbase::Duration time_remaining);
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};
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// Operation data which concerns a single server
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class ServerOperation
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{
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public:
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MariaDBServer* const target; // Target server
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const bool to_from_master; // Was the target a master / should it become one
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const bool handle_events; // Should scheduled server events be disabled/enabled?
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const std::string sql_file; // Path to file with SQL commands to run during op
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const SlaveStatusArray conns_to_copy; // Slave connections the target should copy/merge
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ServerOperation(MariaDBServer* target, bool was_is_master, bool handle_events,
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const std::string& sql_file, const SlaveStatusArray& conns_to_copy);
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};
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/**
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* Helper class for simplifying working with resultsets. Used in MariaDBServer.
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*/
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class QueryResult
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{
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// These need to be banned to avoid premature destruction.
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QueryResult(const QueryResult&) = delete;
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QueryResult& operator=(const QueryResult&) = delete;
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public:
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QueryResult(MYSQL_RES* resultset = NULL);
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~QueryResult();
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/**
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* Advance to next row. Affects all result returning functions.
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*
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* @return True if the next row has data, false if the current row was the last one.
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*/
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bool next_row();
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/**
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* Get the index of the current row.
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*
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* @return Current row index, or -1 if no data or next_row() has not been called yet.
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*/
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int64_t get_current_row_index() const;
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/**
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* How many columns the result set has.
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*
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* @return Column count, or -1 if no data.
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*/
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int64_t get_col_count() const;
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/**
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* How many rows does the result set have?
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*
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* @return The number of rows or -1 on error
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*/
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int64_t get_row_count() const;
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/**
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* Get a numeric index for a column name. May give wrong results if column names are not unique.
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*
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* @param col_name Column name
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* @return Index or -1 if not found.
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*/
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int64_t get_col_index(const std::string& col_name) const;
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/**
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* Read a string value from the current row and given column. Empty string and (null) are both interpreted
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* as the empty string.
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*
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* @param column_ind Column index
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* @return Value as string
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*/
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std::string get_string(int64_t column_ind) const;
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/**
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* Read a non-negative integer value from the current row and given column.
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*
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* @param column_ind Column index
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* @return Value as integer. 0 or greater indicates success, -1 is returned on error.
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*/
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int64_t get_uint(int64_t column_ind) const;
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/**
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* Read a boolean value from the current row and given column.
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*
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* @param column_ind Column index
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* @return Value as boolean. Returns true if the text is either 'Y' or '1'.
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*/
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bool get_bool(int64_t column_ind) const;
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private:
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MYSQL_RES* m_resultset = NULL; // Underlying result set, freed at dtor.
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std::unordered_map<std::string, int64_t> m_col_indexes; // Map of column name -> index
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MYSQL_ROW m_rowdata = NULL; // Data for current row
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int64_t m_current_row_ind = -1;// Index of current row
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};
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