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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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2
server/modules/monitor/mariadbmon/CMakeLists.txt
View File

@ -1,5 +1,5 @@
add_library(mariadbmon SHARED mariadbmon.cc mariadbserver.cc cluster_manipulation.cc cluster_discovery.cc
mariadbmon_common.cc gtid.cc)
mariadbmon_common.cc server_utils.cc)
target_link_libraries(mariadbmon maxscale-common)
add_dependencies(mariadbmon pcre2)
set_target_properties(mariadbmon PROPERTIES VERSION "1.4.0")

155
server/modules/monitor/mariadbmon/gtid.hh
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@ -1,155 +0,0 @@
/*
* 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>
/**
* 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;
};

7
server/modules/monitor/mariadbmon/mariadbmon.hh
View File

@ -33,6 +33,13 @@ typedef std::unordered_map<int64_t, MariaDBServer*> IdToServerMap;
// Map of cycle number to cycle members. The elements should be in order for predictability when iterating.
typedef std::map<int, ServerArray> CycleMap;
// Some methods need a log on/off setting.
enum class Log
{
OFF,
ON
};
// MariaDB Monitor instance data
class MariaDBMonitor : public maxscale::MonitorInstance
{

20
server/modules/monitor/mariadbmon/mariadbmon_common.cc
View File

@ -32,23 +32,3 @@ void DelimitedPrinter::cat(string& target, const string& addition)
target += m_current_separator + addition;
m_current_separator = m_separator;
}
ClusterOperation::ClusterOperation(OperationType type,
MariaDBServer* promotion_target, MariaDBServer* demotion_target,
bool demo_target_is_master, bool handle_events,
string& promotion_sql_file, string& demotion_sql_file,
string& replication_user, string& replication_password,
json_t** error, maxbase::Duration time_remaining)
: type(type)
, promotion_target(promotion_target)
, demotion_target(demotion_target)
, demotion_target_is_master(demo_target_is_master)
, handle_events(handle_events)
, promotion_sql_file(promotion_sql_file)
, demotion_sql_file(demotion_sql_file)
, replication_user(replication_user)
, replication_password(replication_password)
, error_out(error)
, time_remaining(time_remaining)
{
}

47
server/modules/monitor/mariadbmon/mariadbmon_common.hh
View File

@ -22,7 +22,6 @@
#include <string>
#include <maxscale/json_api.h>
#include <maxbase/stopwatch.hh>
/** Utility macros for printing both MXS_ERROR and json error */
#define PRINT_MXS_JSON_ERROR(err_out, format, ...) \
@ -66,49 +65,3 @@ private:
const std::string m_separator;
std::string m_current_separator;
};
enum class Log
{
OFF,
ON
};
enum class OperationType
{
SWITCHOVER,
FAILOVER
};
class MariaDBServer;
/**
* 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);
};

196
server/modules/monitor/mariadbmon/mariadbserver.cc
View File

@ -26,15 +26,6 @@ using maxscale::string_printf;
using maxbase::Duration;
using maxbase::StopWatch;
namespace
{
// Used for Slave_IO_Running
const char YES[] = "Yes";
const char PREPARING[] = "Preparing";
const char CONNECTING[] = "Connecting";
const char NO[] = "No";
}
class MariaDBServer::EventInfo
{
public:
@ -2046,190 +2037,3 @@ bool MariaDBServer::redirect_existing_slave_conn(ClusterOperation& op)
} // 'stop_slave_conn' prints its own errors
return success;
}
string SlaveStatus::to_string() const
{
// Print all of this on the same line to make things compact. Are the widths reasonable? The format is
// not quite array-like since usually there is just one row. May be changed later.
// Form the components of the line.
string host_port = string_printf("[%s]:%d", master_host.c_str(), master_port);
string running_states = string_printf("%s/%s",
slave_io_to_string(slave_io_running).c_str(),
slave_sql_running ? "Yes" : "No");
string rval = string_printf(
" Host: %22s, IO/SQL running: %7s, Master ID: %4" PRId64 ", Gtid_IO_Pos: %s, R.Lag: %d",
host_port.c_str(),
running_states.c_str(),
master_server_id,
gtid_io_pos.to_string().c_str(),
seconds_behind_master);
return rval;
}
string SlaveStatus::to_short_string(const string& owner) const
{
if (name.empty())
{
return string_printf("Slave connection from %s to [%s]:%i",
owner.c_str(), master_host.c_str(), master_port);
}
else
{
return string_printf("Slave connection '%s' from %s to [%s]:%i",
name.c_str(), owner.c_str(), master_host.c_str(), master_port);
}
}
json_t* SlaveStatus::to_json() const
{
json_t* result = json_object();
json_object_set_new(result, "connection_name", json_string(name.c_str()));
json_object_set_new(result, "master_host", json_string(master_host.c_str()));
json_object_set_new(result, "master_port", json_integer(master_port));
json_object_set_new(result,
"slave_io_running",
json_string(slave_io_to_string(slave_io_running).c_str()));
json_object_set_new(result, "slave_sql_running", json_string(slave_sql_running ? "Yes" : "No"));
json_object_set_new(result,
"seconds_behing_master",
seconds_behind_master == MXS_RLAG_UNDEFINED ? json_null() :
json_integer(seconds_behind_master));
json_object_set_new(result, "master_server_id", json_integer(master_server_id));
json_object_set_new(result, "last_io_or_sql_error", json_string(last_error.c_str()));
json_object_set_new(result, "gtid_io_pos", json_string(gtid_io_pos.to_string().c_str()));
return result;
}
SlaveStatus::slave_io_running_t SlaveStatus::slave_io_from_string(const std::string& str)
{
slave_io_running_t rval = SLAVE_IO_NO;
if (str == YES)
{
rval = SLAVE_IO_YES;
}
// Interpret "Preparing" as "Connecting". It's not quite clear if the master server id has been read
// or if server versions between master and slave have been checked, so better be on the safe side.
else if (str == CONNECTING || str == PREPARING)
{
rval = SLAVE_IO_CONNECTING;
}
else if (str != NO)
{
MXS_ERROR("Unexpected value for Slave_IO_Running: '%s'.", str.c_str());
}
return rval;
}
string SlaveStatus::slave_io_to_string(SlaveStatus::slave_io_running_t slave_io)
{
string rval;
switch (slave_io)
{
case SlaveStatus::SLAVE_IO_YES:
rval = YES;
break;
case SlaveStatus::SLAVE_IO_CONNECTING:
rval = CONNECTING;
break;
case SlaveStatus::SLAVE_IO_NO:
rval = NO;
break;
default:
mxb_assert(!false);
}
return rval;
}
QueryResult::QueryResult(MYSQL_RES* resultset)
: m_resultset(resultset)
{
if (m_resultset)
{
auto columns = mysql_num_fields(m_resultset);
MYSQL_FIELD* field_info = mysql_fetch_fields(m_resultset);
for (int64_t column_index = 0; column_index < columns; column_index++)
{
string key(field_info[column_index].name);
// TODO: Think of a way to handle duplicate names nicely. Currently this should only be used
// for known queries.
mxb_assert(m_col_indexes.count(key) == 0);
m_col_indexes[key] = column_index;
}
}
}
QueryResult::~QueryResult()
{
if (m_resultset)
{
mysql_free_result(m_resultset);
}
}
bool QueryResult::next_row()
{
mxb_assert(m_resultset);
m_rowdata = mysql_fetch_row(m_resultset);
if (m_rowdata)
{
m_current_row_ind++;
return true;
}
return false;
}
int64_t QueryResult::get_current_row_index() const
{
return m_current_row_ind;
}
int64_t QueryResult::get_col_count() const
{
return m_resultset ? mysql_num_fields(m_resultset) : -1;
}
int64_t QueryResult::get_row_count() const
{
return m_resultset ? mysql_num_rows(m_resultset) : -1;
}
int64_t QueryResult::get_col_index(const string& col_name) const
{
auto iter = m_col_indexes.find(col_name);
return (iter != m_col_indexes.end()) ? iter->second : -1;
}
string QueryResult::get_string(int64_t column_ind) const
{
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
char* data = m_rowdata[column_ind];
return data ? data : "";
}
int64_t QueryResult::get_uint(int64_t column_ind) const
{
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
char* data = m_rowdata[column_ind];
int64_t rval = -1;
if (data && *data)
{
errno = 0; // strtoll sets this
char* endptr = NULL;
auto parsed = strtoll(data, &endptr, 10);
if (parsed >= 0 && errno == 0 && *endptr == '\0')
{
rval = parsed;
}
}
return rval;
}
bool QueryResult::get_bool(int64_t column_ind) const
{
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
char* data = m_rowdata[column_ind];
return data ? (strcmp(data, "Y") == 0 || strcmp(data, "1") == 0) : false;
}

126
server/modules/monitor/mariadbmon/mariadbserver.hh
View File

@ -17,56 +17,13 @@
#include <memory>
#include <maxscale/monitor.h>
#include <maxbase/stopwatch.hh>
#include "gtid.hh"
#include "server_utils.hh"
class QueryResult;
class MariaDBServer;
// Server pointer array
typedef std::vector<MariaDBServer*> ServerArray;
// 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);
};
// This class groups some miscellaneous replication related settings together.
class ReplicationSettings
{
@ -572,84 +529,3 @@ private:
SlaveStatus* slave_connection_status_mutable(const MariaDBServer* target);
std::string generate_change_master_cmd(ClusterOperation& op, const SlaveStatus& slave_conn);
};
/**
* 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
};

218
server/modules/monitor/mariadbmon/gtid.cc → server/modules/monitor/mariadbmon/server_utils.cc
View File

@ -10,8 +10,7 @@
* of this software will be governed by version 2 or later of the General
* Public License.
*/
#include "gtid.hh"
#include "server_utils.hh"
#include <algorithm>
#include <inttypes.h>
@ -21,6 +20,130 @@
using std::string;
using maxscale::string_printf;
namespace
{
// Used for Slave_IO_Running
const char YES[] = "Yes";
const char PREPARING[] = "Preparing";
const char CONNECTING[] = "Connecting";
const char NO[] = "No";
}
string SlaveStatus::to_string() const
{
// Print all of this on the same line to make things compact. Are the widths reasonable? The format is
// not quite array-like since usually there is just one row. May be changed later.
// Form the components of the line.
string host_port = string_printf("[%s]:%d", master_host.c_str(), master_port);
string running_states = string_printf("%s/%s",
slave_io_to_string(slave_io_running).c_str(),
slave_sql_running ? "Yes" : "No");
string rval = string_printf(
" Host: %22s, IO/SQL running: %7s, Master ID: %4" PRId64 ", Gtid_IO_Pos: %s, R.Lag: %d",
host_port.c_str(),
running_states.c_str(),
master_server_id,
gtid_io_pos.to_string().c_str(),
seconds_behind_master);
return rval;
}
string SlaveStatus::to_short_string(const string& owner) const
{
if (name.empty())
{
return string_printf("Slave connection from %s to [%s]:%i",
owner.c_str(), master_host.c_str(), master_port);
}
else
{
return string_printf("Slave connection '%s' from %s to [%s]:%i",
name.c_str(), owner.c_str(), master_host.c_str(), master_port);
}
}
json_t* SlaveStatus::to_json() const
{
json_t* result = json_object();
json_object_set_new(result, "connection_name", json_string(name.c_str()));
json_object_set_new(result, "master_host", json_string(master_host.c_str()));
json_object_set_new(result, "master_port", json_integer(master_port));
json_object_set_new(result,
"slave_io_running",
json_string(slave_io_to_string(slave_io_running).c_str()));
json_object_set_new(result, "slave_sql_running", json_string(slave_sql_running ? "Yes" : "No"));
json_object_set_new(result,
"seconds_behing_master",
seconds_behind_master == MXS_RLAG_UNDEFINED ? json_null() :
json_integer(seconds_behind_master));
json_object_set_new(result, "master_server_id", json_integer(master_server_id));
json_object_set_new(result, "last_io_or_sql_error", json_string(last_error.c_str()));
json_object_set_new(result, "gtid_io_pos", json_string(gtid_io_pos.to_string().c_str()));
return result;
}
SlaveStatus::slave_io_running_t SlaveStatus::slave_io_from_string(const std::string& str)
{
slave_io_running_t rval = SLAVE_IO_NO;
if (str == YES)
{
rval = SLAVE_IO_YES;
}
// Interpret "Preparing" as "Connecting". It's not quite clear if the master server id has been read
// or if server versions between master and slave have been checked, so better be on the safe side.
else if (str == CONNECTING || str == PREPARING)
{
rval = SLAVE_IO_CONNECTING;
}
else if (str != NO)
{
MXS_ERROR("Unexpected value for Slave_IO_Running: '%s'.", str.c_str());
}
return rval;
}
string SlaveStatus::slave_io_to_string(SlaveStatus::slave_io_running_t slave_io)
{
string rval;
switch (slave_io)
{
case SlaveStatus::SLAVE_IO_YES:
rval = YES;
break;
case SlaveStatus::SLAVE_IO_CONNECTING:
rval = CONNECTING;
break;
case SlaveStatus::SLAVE_IO_NO:
rval = NO;
break;
default:
mxb_assert(!false);
}
return rval;
}
ClusterOperation::ClusterOperation(OperationType type,
MariaDBServer* promotion_target, MariaDBServer* demotion_target,
bool demo_target_is_master, bool handle_events,
string& promotion_sql_file, string& demotion_sql_file,
string& replication_user, string& replication_password,
json_t** error, maxbase::Duration time_remaining)
: type(type)
, promotion_target(promotion_target)
, demotion_target(demotion_target)
, demotion_target_is_master(demo_target_is_master)
, handle_events(handle_events)
, promotion_sql_file(promotion_sql_file)
, demotion_sql_file(demotion_sql_file)
, replication_user(replication_user)
, replication_password(replication_password)
, error_out(error)
, time_remaining(time_remaining)
{}
GtidList GtidList::from_string(const string& gtid_string)
{
mxb_assert(gtid_string.size());
@ -251,3 +374,94 @@ Gtid GtidList::get_gtid(uint32_t domain) const
}
return rval;
}
QueryResult::QueryResult(MYSQL_RES* resultset)
: m_resultset(resultset)
{
if (m_resultset)
{
auto columns = mysql_num_fields(m_resultset);
MYSQL_FIELD* field_info = mysql_fetch_fields(m_resultset);
for (int64_t column_index = 0; column_index < columns; column_index++)
{
string key(field_info[column_index].name);
// TODO: Think of a way to handle duplicate names nicely. Currently this should only be used
// for known queries.
mxb_assert(m_col_indexes.count(key) == 0);
m_col_indexes[key] = column_index;
}
}
}
QueryResult::~QueryResult()
{
if (m_resultset)
{
mysql_free_result(m_resultset);
}
}
bool QueryResult::next_row()
{
mxb_assert(m_resultset);
m_rowdata = mysql_fetch_row(m_resultset);
if (m_rowdata)
{
m_current_row_ind++;
return true;
}
return false;
}
int64_t QueryResult::get_current_row_index() const
{
return m_current_row_ind;
}
int64_t QueryResult::get_col_count() const
{
return m_resultset ? mysql_num_fields(m_resultset) : -1;
}
int64_t QueryResult::get_row_count() const
{
return m_resultset ? mysql_num_rows(m_resultset) : -1;
}
int64_t QueryResult::get_col_index(const string& col_name) const
{
auto iter = m_col_indexes.find(col_name);
return (iter != m_col_indexes.end()) ? iter->second : -1;
}
string QueryResult::get_string(int64_t column_ind) const
{
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
char* data = m_rowdata[column_ind];
return data ? data : "";
}
int64_t QueryResult::get_uint(int64_t column_ind) const
{
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
char* data = m_rowdata[column_ind];
int64_t rval = -1;
if (data && *data)
{
errno = 0; // strtoll sets this
char* endptr = NULL;
auto parsed = strtoll(data, &endptr, 10);
if (parsed >= 0 && errno == 0 && *endptr == '\0')
{
rval = parsed;
}
}
return rval;
}
bool QueryResult::get_bool(int64_t column_ind) const
{
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
char* data = m_rowdata[column_ind];
return data ? (strcmp(data, "Y") == 0 || strcmp(data, "1") == 0) : false;
}

322
server/modules/monitor/mariadbmon/server_utils.hh Normal file
View File

@ -0,0 +1,322 @@
/*
* 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
};

2
server/modules/monitor/mariadbmon/test/test_gtid.cc
View File

@ -11,7 +11,7 @@
* Public License.
*/
#include "../gtid.hh"
#include "../server_utils.hh"
#include "maxbase/log.hh"
#include <iostream>
#include <string>