/
pg_stat_statements.go
238 lines (228 loc) · 9.41 KB
/
pg_stat_statements.go
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package collectors
import (
"context"
"fmt"
"strconv"
"sync"
"time"
"github.com/odonate/postgres-exporter/exporter/db"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sync/errgroup"
)
// PgStatStatementsCollector collects from pg_stat_statements.
type PgStatStatementsCollector struct {
dbClients []*db.Client
mutex sync.RWMutex
calls *prometheus.Desc
totalTimeSeconds *prometheus.Desc
minTimeSeconds *prometheus.Desc
maxTimeSeconds *prometheus.Desc
meanTimeSeconds *prometheus.Desc
stdDevTimeSeconds *prometheus.Desc
rows *prometheus.Desc
sharedBlksHit *prometheus.Desc
sharedBlksRead *prometheus.Desc
sharedBlksDirtied *prometheus.Desc
sharedBlksWritten *prometheus.Desc
localBlksHit *prometheus.Desc
localBlksRead *prometheus.Desc
localBlksDirtied *prometheus.Desc
localBlksWritten *prometheus.Desc
tempBlksRead *prometheus.Desc
tempBlksWritten *prometheus.Desc
blkReadTimeSeconds *prometheus.Desc
blkWriteTimeSeconds *prometheus.Desc
}
// NewPgStatStatementsCollector instantiates and returns a new PgStatStatementsCollector.
func NewPgStatStatementsCollector(dbClients []*db.Client) *PgStatStatementsCollector {
variableLabels := []string{"database", "rolname", "datname", "queryid", "query"}
return &PgStatStatementsCollector{
dbClients: dbClients,
calls: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "calls"),
"",
variableLabels,
nil,
),
totalTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "total_time_seconds"),
"",
variableLabels,
nil,
),
minTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "min_time_seconds"),
"",
variableLabels,
nil,
),
maxTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "max_time_seconds"),
"",
variableLabels,
nil,
),
meanTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "mean_time_seconds"),
"",
variableLabels,
nil,
),
stdDevTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "std_dev_time_seconds"),
"",
variableLabels,
nil,
),
rows: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "rows"),
"",
variableLabels,
nil,
),
sharedBlksHit: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "shared_blks_hit"),
"",
variableLabels,
nil,
),
sharedBlksRead: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "shared_blks_read"),
"",
variableLabels,
nil,
),
sharedBlksDirtied: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "shared_blks_dirtied"),
"",
variableLabels,
nil,
),
sharedBlksWritten: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "shared_blks_written"),
"",
variableLabels,
nil,
),
localBlksHit: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "local_blks_hit"),
"",
variableLabels,
nil,
),
localBlksRead: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "local_blks_read"),
"",
variableLabels,
nil,
),
localBlksDirtied: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "local_blks_dirtied"),
"",
variableLabels,
nil,
),
localBlksWritten: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "local_blks_written"),
"",
variableLabels,
nil,
),
tempBlksRead: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "templ_blks_read"),
"",
variableLabels,
nil,
),
tempBlksWritten: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "temp_blks_written"),
"",
variableLabels,
nil,
),
blkReadTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "blk_read_time_seconds"),
"",
variableLabels,
nil,
),
blkWriteTimeSeconds: prometheus.NewDesc(
prometheus.BuildFQName(namespace, statementsSubSystem, "blk_write_time_seconds"),
"",
variableLabels,
nil,
),
}
}
// Describe implements the prometheus.Collector.
func (c *PgStatStatementsCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.calls
ch <- c.totalTimeSeconds
ch <- c.minTimeSeconds
ch <- c.maxTimeSeconds
ch <- c.meanTimeSeconds
ch <- c.stdDevTimeSeconds
ch <- c.rows
ch <- c.sharedBlksHit
ch <- c.sharedBlksRead
ch <- c.sharedBlksDirtied
ch <- c.sharedBlksWritten
ch <- c.localBlksHit
ch <- c.localBlksRead
ch <- c.localBlksDirtied
ch <- c.localBlksWritten
ch <- c.tempBlksRead
ch <- c.tempBlksWritten
ch <- c.blkReadTimeSeconds
ch <- c.blkWriteTimeSeconds
}
// Collect implements the promtheus.Collector.
func (c *PgStatStatementsCollector) Collect(ch chan<- prometheus.Metric) {
_ = c.Scrape(ch)
}
// Scrape implements our Scraper interfacc.
func (c *PgStatStatementsCollector) Scrape(ch chan<- prometheus.Metric) error {
start := time.Now()
defer func() {
log.Infof("statement scrape took %dms", time.Now().Sub(start).Milliseconds())
}()
group := errgroup.Group{}
for _, dbClient := range c.dbClients {
dbClient := dbClient
group.Go(func() error { return c.scrape(dbClient, ch) })
}
if err := group.Wait(); err != nil {
return fmt.Errorf("scraping: %w", err)
}
return nil
}
func (c *PgStatStatementsCollector) scrape(dbClient *db.Client, ch chan<- prometheus.Metric) error {
statementStats, err := dbClient.SelectPgStatStatements(context.Background())
if err != nil {
return fmt.Errorf("statement stats: %w", err)
}
start := time.Now()
log.Infof("statements lock aquire %dms", time.Now().Sub(start).Milliseconds())
for _, stat := range statementStats {
ch <- prometheus.MustNewConstMetric(c.calls, prometheus.CounterValue, float64(stat.Calls), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.totalTimeSeconds, prometheus.CounterValue, stat.TotalTimeSeconds, stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.minTimeSeconds, prometheus.GaugeValue, stat.MinTimeSeconds, stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.maxTimeSeconds, prometheus.GaugeValue, stat.MaxTimeSeconds, stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.meanTimeSeconds, prometheus.GaugeValue, stat.MeanTimeSeconds, stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.stdDevTimeSeconds, prometheus.GaugeValue, stat.StdDevTimeSeconds, stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.rows, prometheus.CounterValue, float64(stat.Rows), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.sharedBlksHit, prometheus.CounterValue, float64(stat.SharedBlksHit), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.sharedBlksRead, prometheus.CounterValue, float64(stat.SharedBlksRead), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.sharedBlksDirtied, prometheus.CounterValue, float64(stat.SharedBlksDirtied), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.sharedBlksWritten, prometheus.CounterValue, float64(stat.SharedBlksWritten), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.localBlksHit, prometheus.CounterValue, float64(stat.LocalBlksHit), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.localBlksRead, prometheus.CounterValue, float64(stat.LocalBlksRead), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.localBlksDirtied, prometheus.CounterValue, float64(stat.LocalBlksDirtied), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.localBlksWritten, prometheus.CounterValue, float64(stat.LocalBlksWritten), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.tempBlksRead, prometheus.CounterValue, float64(stat.TempBlksRead), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.tempBlksWritten, prometheus.CounterValue, float64(stat.TempBlksWritten), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.blkReadTimeSeconds, prometheus.CounterValue, float64(stat.BlkReadTimeSeconds), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
ch <- prometheus.MustNewConstMetric(c.blkWriteTimeSeconds, prometheus.CounterValue, float64(stat.BlkWriteTimeSeconds), stat.Database, stat.RolName, stat.DatName, strconv.Itoa(stat.QueryID), stat.Query)
}
return nil
}