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// SPDX-License-Identifier: GPL-3.0-or-later
package postgres
import (
"database/sql"
_ "embed"
"errors"
"sync"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/module"
"github.com/netdata/netdata/go/go.d.plugin/pkg/matcher"
"github.com/netdata/netdata/go/go.d.plugin/pkg/metrics"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
"github.com/jackc/pgx/v4/stdlib"
_ "github.com/jackc/pgx/v4/stdlib"
)
//go:embed "config_schema.json"
var configSchema string
func init() {
module.Register("postgres", module.Creator{
JobConfigSchema: configSchema,
Create: func() module.Module { return New() },
})
}
func New() *Postgres {
return &Postgres{
Config: Config{
Timeout: web.Duration(time.Second * 2),
DSN: "postgres://postgres:postgres@127.0.0.1:5432/postgres",
XactTimeHistogram: []float64{.1, .5, 1, 2.5, 5, 10},
QueryTimeHistogram: []float64{.1, .5, 1, 2.5, 5, 10},
// charts: 20 x table, 4 x index.
// https://discord.com/channels/847502280503590932/1022693928874549368
MaxDBTables: 50,
MaxDBIndexes: 250,
},
charts: baseCharts.Copy(),
dbConns: make(map[string]*dbConn),
mx: &pgMetrics{
dbs: make(map[string]*dbMetrics),
indexes: make(map[string]*indexMetrics),
tables: make(map[string]*tableMetrics),
replApps: make(map[string]*replStandbyAppMetrics),
replSlots: make(map[string]*replSlotMetrics),
},
recheckSettingsEvery: time.Minute * 30,
doSlowEvery: time.Minute * 5,
addXactQueryRunningTimeChartsOnce: &sync.Once{},
addWALFilesChartsOnce: &sync.Once{},
}
}
type Config struct {
UpdateEvery int `yaml:"update_every" json:"update_every"`
DSN string `yaml:"dsn" json:"dsn"`
Timeout web.Duration `yaml:"timeout" json:"timeout"`
DBSelector string `yaml:"collect_databases_matching" json:"collect_databases_matching"`
XactTimeHistogram []float64 `yaml:"transaction_time_histogram" json:"transaction_time_histogram"`
QueryTimeHistogram []float64 `yaml:"query_time_histogram" json:"query_time_histogram"`
MaxDBTables int64 `yaml:"max_db_tables" json:"max_db_tables"`
MaxDBIndexes int64 `yaml:"max_db_indexes" json:"max_db_indexes"`
}
type (
Postgres struct {
module.Base
Config `yaml:",inline" json:""`
charts *module.Charts
addXactQueryRunningTimeChartsOnce *sync.Once
addWALFilesChartsOnce *sync.Once
db *sql.DB
dbConns map[string]*dbConn
superUser *bool
pgIsInRecovery *bool
pgVersion int
dbSr matcher.Matcher
recheckSettingsTime time.Time
recheckSettingsEvery time.Duration
doSlowTime time.Time
doSlowEvery time.Duration
mx *pgMetrics
}
dbConn struct {
db *sql.DB
connStr string
connErrors int
}
)
func (p *Postgres) Configuration() any {
return p.Config
}
func (p *Postgres) Init() error {
err := p.validateConfig()
if err != nil {
p.Errorf("config validation: %v", err)
return err
}
sr, err := p.initDBSelector()
if err != nil {
p.Errorf("config validation: %v", err)
return err
}
p.dbSr = sr
p.mx.xactTimeHist = metrics.NewHistogramWithRangeBuckets(p.XactTimeHistogram)
p.mx.queryTimeHist = metrics.NewHistogramWithRangeBuckets(p.QueryTimeHistogram)
return nil
}
func (p *Postgres) Check() error {
mx, err := p.collect()
if err != nil {
p.Error(err)
return err
}
if len(mx) == 0 {
return errors.New("no metrics collected")
}
return nil
}
func (p *Postgres) Charts() *module.Charts {
return p.charts
}
func (p *Postgres) Collect() map[string]int64 {
mx, err := p.collect()
if err != nil {
p.Error(err)
}
if len(mx) == 0 {
return nil
}
return mx
}
func (p *Postgres) Cleanup() {
if p.db == nil {
return
}
if err := p.db.Close(); err != nil {
p.Warningf("cleanup: error on closing the Postgres database [%s]: %v", p.DSN, err)
}
p.db = nil
for dbname, conn := range p.dbConns {
delete(p.dbConns, dbname)
if conn.connStr != "" {
stdlib.UnregisterConnConfig(conn.connStr)
}
if conn.db != nil {
_ = conn.db.Close()
}
}
}
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