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fix converting NULL to uint64 is unsupported in size table #1070

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25 changes: 20 additions & 5 deletions collector/pg_wal.go
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ package collector

import (
"context"

"database/sql"
"github.com/prometheus/client_golang/prometheus"
)

Expand Down Expand Up @@ -66,19 +66,34 @@ func (c PGWALCollector) Update(ctx context.Context, instance *instance, ch chan<
pgWALQuery,
)

var segments uint64
var size uint64
var segments sql.NullInt64
var size sql.NullInt64
err := row.Scan(&segments, &size)
if err != nil {
return err
}

var segmentsValue float64
if segments.Valid {
segmentsValue = float64(segments.Int64)
} else {
segmentsValue = 0
}

var sizeValue float64
if size.Valid {
sizeValue = float64(size.Int64)
} else {
sizeValue = 0
}

ch <- prometheus.MustNewConstMetric(
pgWALSegments,
prometheus.GaugeValue, float64(segments),
prometheus.GaugeValue, segmentsValue,
)
ch <- prometheus.MustNewConstMetric(
pgWALSize,
prometheus.GaugeValue, float64(size),
prometheus.GaugeValue, sizeValue,
)
return nil
}