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// SPDX-License-Identifier: GPL-3.0-or-later
package mysql
import (
"context"
"database/sql"
"errors"
"fmt"
"strconv"
"strings"
"time"
"github.com/blang/semver/v4"
)
func (m *MySQL) collect() (map[string]int64, error) {
if m.db == nil {
if err := m.openConnection(); err != nil {
return nil, err
}
}
if m.version == nil {
if err := m.collectVersion(); err != nil {
return nil, fmt.Errorf("error on collecting version: %v", err)
}
// https://mariadb.com/kb/en/user-statistics/
m.doUserStatistics = m.isPercona || m.isMariaDB && m.version.GTE(semver.Version{Major: 10, Minor: 1, Patch: 1})
}
m.disableSessionQueryLog()
mx := make(map[string]int64)
if err := m.collectGlobalStatus(mx); err != nil {
return nil, fmt.Errorf("error on collecting global status: %v", err)
}
if hasInnodbOSLog(mx) {
m.addInnoDBOSLogOnce.Do(m.addInnoDBOSLogCharts)
}
if hasInnodbDeadlocks(mx) {
m.addInnodbDeadlocksOnce.Do(m.addInnodbDeadlocksChart)
}
if hasQCacheMetrics(mx) {
m.addQCacheOnce.Do(m.addQCacheCharts)
}
if hasGaleraMetrics(mx) {
m.addGaleraOnce.Do(m.addGaleraCharts)
}
if hasTableOpenCacheOverflowsMetrics(mx) {
m.addTableOpenCacheOverflowsOnce.Do(m.addTableOpenCacheOverflowChart)
}
now := time.Now()
if now.Sub(m.recheckGlobalVarsTime) > m.recheckGlobalVarsEvery {
if err := m.collectGlobalVariables(); err != nil {
return nil, fmt.Errorf("error on collecting global variables: %v", err)
}
}
mx["max_connections"] = m.varMaxConns
mx["table_open_cache"] = m.varTableOpenCache
if m.isMariaDB || !strings.Contains(m.varDisabledStorageEngine, "MyISAM") {
m.addMyISAMOnce.Do(m.addMyISAMCharts)
}
if m.varLogBin != "OFF" {
m.addBinlogOnce.Do(m.addBinlogCharts)
}
// TODO: perhaps make a decisions based on privileges? (SHOW GRANTS FOR CURRENT_USER();)
if m.doSlaveStatus {
if err := m.collectSlaveStatus(mx); err != nil {
m.Warningf("error on collecting slave status: %v", err)
m.doSlaveStatus = errors.Is(err, context.DeadlineExceeded)
}
}
if m.doUserStatistics {
if err := m.collectUserStatistics(mx); err != nil {
m.Warningf("error on collecting user statistics: %v", err)
m.doUserStatistics = errors.Is(err, context.DeadlineExceeded)
}
}
if err := m.collectProcessListStatistics(mx); err != nil {
m.Errorf("error on collecting process list statistics: %v", err)
}
calcThreadCacheMisses(mx)
return mx, nil
}
func (m *MySQL) openConnection() error {
db, err := sql.Open("mysql", m.DSN)
if err != nil {
return fmt.Errorf("error on opening a connection with the mysql database [%s]: %v", m.safeDSN, err)
}
db.SetConnMaxLifetime(10 * time.Minute)
ctx, cancel := context.WithTimeout(context.Background(), m.Timeout.Duration())
defer cancel()
if err := db.PingContext(ctx); err != nil {
_ = db.Close()
return fmt.Errorf("error on pinging the mysql database [%s]: %v", m.safeDSN, err)
}
m.db = db
return nil
}
func calcThreadCacheMisses(collected map[string]int64) {
threads, cons := collected["threads_created"], collected["connections"]
if threads == 0 || cons == 0 {
collected["thread_cache_misses"] = 0
} else {
collected["thread_cache_misses"] = int64(float64(threads) / float64(cons) * 10000)
}
}
func hasInnodbOSLog(collected map[string]int64) bool {
// removed in MariaDB 10.8 (https://mariadb.com/kb/en/innodb-status-variables/#innodb_os_log_fsyncs)
_, ok := collected["innodb_os_log_fsyncs"]
return ok
}
func hasInnodbDeadlocks(collected map[string]int64) bool {
_, ok := collected["innodb_deadlocks"]
return ok
}
func hasGaleraMetrics(collected map[string]int64) bool {
_, ok := collected["wsrep_received"]
return ok
}
func hasQCacheMetrics(collected map[string]int64) bool {
_, ok := collected["qcache_hits"]
return ok
}
func hasTableOpenCacheOverflowsMetrics(collected map[string]int64) bool {
_, ok := collected["table_open_cache_overflows"]
return ok
}
func (m *MySQL) collectQuery(query string, assign func(column, value string, lineEnd bool)) (duration int64, err error) {
ctx, cancel := context.WithTimeout(context.Background(), m.Timeout.Duration())
defer cancel()
s := time.Now()
rows, err := m.db.QueryContext(ctx, query)
if err != nil {
return 0, err
}
duration = time.Since(s).Milliseconds()
defer func() { _ = rows.Close() }()
columns, err := rows.Columns()
if err != nil {
return duration, err
}
vs := makeValues(len(columns))
for rows.Next() {
if err := rows.Scan(vs...); err != nil {
return duration, err
}
for i, l := 0, len(vs); i < l; i++ {
assign(columns[i], valueToString(vs[i]), i == l-1)
}
}
return duration, rows.Err()
}
func makeValues(size int) []any {
vs := make([]any, size)
for i := range vs {
vs[i] = &sql.NullString{}
}
return vs
}
func valueToString(value any) string {
v, ok := value.(*sql.NullString)
if !ok || !v.Valid {
return ""
}
return v.String
}
func parseInt(s string) int64 {
v, _ := strconv.ParseInt(s, 10, 64)
return v
}
func parseFloat(s string) float64 {
v, _ := strconv.ParseFloat(s, 64)
return v
}
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