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// SPDX-License-Identifier: GPL-3.0-or-later
package postgres
import (
"context"
"database/sql"
"fmt"
"strconv"
"time"
"github.com/jackc/pgx/v4"
"github.com/jackc/pgx/v4/stdlib"
)
const (
pgVersion94 = 9_04_00
pgVersion10 = 10_00_00
pgVersion11 = 11_00_00
)
func (p *Postgres) collect() (map[string]int64, error) {
if p.db == nil {
db, err := p.openPrimaryConnection()
if err != nil {
return nil, err
}
p.db = db
}
if p.pgVersion == 0 {
ver, err := p.doQueryServerVersion()
if err != nil {
return nil, fmt.Errorf("querying server version error: %v", err)
}
p.pgVersion = ver
p.Debugf("connected to PostgreSQL v%d", p.pgVersion)
}
if p.superUser == nil {
v, err := p.doQueryIsSuperUser()
if err != nil {
return nil, fmt.Errorf("querying is super user error: %v", err)
}
p.superUser = &v
p.Debugf("connected as super user: %v", *p.superUser)
}
if p.pgIsInRecovery == nil {
v, err := p.doQueryPGIsInRecovery()
if err != nil {
return nil, fmt.Errorf("querying recovery status error: %v", err)
}
p.pgIsInRecovery = &v
p.Debugf("the instance is in recovery mode: %v", *p.pgIsInRecovery)
}
now := time.Now()
if now.Sub(p.recheckSettingsTime) > p.recheckSettingsEvery {
p.recheckSettingsTime = now
maxConn, err := p.doQuerySettingsMaxConnections()
if err != nil {
return nil, fmt.Errorf("querying settings max connections error: %v", err)
}
p.mx.maxConnections = maxConn
maxLocks, err := p.doQuerySettingsMaxLocksHeld()
if err != nil {
return nil, fmt.Errorf("querying settings max locks held error: %v", err)
}
p.mx.maxLocksHeld = maxLocks
}
p.resetMetrics()
if p.pgVersion >= pgVersion10 {
// need 'backend_type' in pg_stat_activity
p.addXactQueryRunningTimeChartsOnce.Do(func() {
p.addTransactionsRunTimeHistogramChart()
p.addQueriesRunTimeHistogramChart()
})
}
if p.isSuperUser() {
p.addWALFilesChartsOnce.Do(p.addWALFilesCharts)
}
if err := p.doQueryGlobalMetrics(); err != nil {
return nil, err
}
if err := p.doQueryReplicationMetrics(); err != nil {
return nil, err
}
if err := p.doQueryDatabasesMetrics(); err != nil {
return nil, err
}
if p.dbSr != nil {
if err := p.doQueryQueryableDatabases(); err != nil {
return nil, err
}
}
if err := p.doQueryTablesMetrics(); err != nil {
return nil, err
}
if err := p.doQueryIndexesMetrics(); err != nil {
return nil, err
}
if now.Sub(p.doSlowTime) > p.doSlowEvery {
p.doSlowTime = now
if err := p.doQueryBloat(); err != nil {
return nil, err
}
if err := p.doQueryColumns(); err != nil {
return nil, err
}
}
mx := make(map[string]int64)
p.collectMetrics(mx)
return mx, nil
}
func (p *Postgres) openPrimaryConnection() (*sql.DB, error) {
db, err := sql.Open("pgx", p.DSN)
if err != nil {
return nil, fmt.Errorf("error on opening a connection with the Postgres database [%s]: %v", p.DSN, err)
}
db.SetMaxOpenConns(1)
db.SetMaxIdleConns(1)
db.SetConnMaxLifetime(10 * time.Minute)
ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
defer cancel()
if err := db.PingContext(ctx); err != nil {
_ = db.Close()
return nil, fmt.Errorf("error on pinging the Postgres database [%s]: %v", p.DSN, err)
}
return db, nil
}
func (p *Postgres) openSecondaryConnection(dbname string) (*sql.DB, string, error) {
cfg, err := pgx.ParseConfig(p.DSN)
if err != nil {
return nil, "", fmt.Errorf("error on parsing DSN [%s]: %v", p.DSN, err)
}
cfg.Database = dbname
connStr := stdlib.RegisterConnConfig(cfg)
db, err := sql.Open("pgx", connStr)
if err != nil {
stdlib.UnregisterConnConfig(connStr)
return nil, "", fmt.Errorf("error on opening a secondary connection with the Postgres database [%s]: %v", dbname, err)
}
db.SetMaxOpenConns(1)
db.SetMaxIdleConns(1)
db.SetConnMaxLifetime(10 * time.Minute)
ctx, cancel := context.WithTimeout(context.Background(), p.Timeout.Duration())
defer cancel()
if err := db.PingContext(ctx); err != nil {
stdlib.UnregisterConnConfig(connStr)
_ = db.Close()
return nil, "", fmt.Errorf("error on pinging the secondary Postgres database [%s]: %v", dbname, err)
}
return db, connStr, nil
}
func (p *Postgres) isSuperUser() bool { return p.superUser != nil && *p.superUser }
func (p *Postgres) isPGInRecovery() bool { return p.pgIsInRecovery != nil && *p.pgIsInRecovery }
func (p *Postgres) getDBMetrics(name string) *dbMetrics {
db, ok := p.mx.dbs[name]
if !ok {
db = &dbMetrics{name: name}
p.mx.dbs[name] = db
}
return db
}
func (p *Postgres) getTableMetrics(name, db, schema string) *tableMetrics {
key := name + "_" + db + "_" + schema
m, ok := p.mx.tables[key]
if !ok {
m = &tableMetrics{db: db, schema: schema, name: name}
p.mx.tables[key] = m
}
return m
}
func (p *Postgres) hasTableMetrics(name, db, schema string) bool {
key := name + "_" + db + "_" + schema
_, ok := p.mx.tables[key]
return ok
}
func (p *Postgres) getIndexMetrics(name, table, db, schema string) *indexMetrics {
key := name + "_" + table + "_" + db + "_" + schema
m, ok := p.mx.indexes[key]
if !ok {
m = &indexMetrics{name: name, db: db, schema: schema, table: table}
p.mx.indexes[key] = m
}
return m
}
func (p *Postgres) hasIndexMetrics(name, table, db, schema string) bool {
key := name + "_" + table + "_" + db + "_" + schema
_, ok := p.mx.indexes[key]
return ok
}
func (p *Postgres) getReplAppMetrics(name string) *replStandbyAppMetrics {
app, ok := p.mx.replApps[name]
if !ok {
app = &replStandbyAppMetrics{name: name}
p.mx.replApps[name] = app
}
return app
}
func (p *Postgres) getReplSlotMetrics(name string) *replSlotMetrics {
slot, ok := p.mx.replSlots[name]
if !ok {
slot = &replSlotMetrics{name: name}
p.mx.replSlots[name] = slot
}
return slot
}
func parseInt(s string) int64 {
v, _ := strconv.ParseInt(s, 10, 64)
return v
}
func parseFloat(s string) int64 {
v, _ := strconv.ParseFloat(s, 64)
return int64(v)
}
func newInt(v int64) *int64 {
return &v
}
func calcPercentage(value, total int64) (v int64) {
if total == 0 {
return 0
}
if v = value * 100 / total; v < 0 {
v = -v
}
return v
}
func calcDeltaPercentage(a, b incDelta) int64 {
return calcPercentage(a.delta(), a.delta()+b.delta())
}
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