pronounsfu/backend/db/metrics.go

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2023-04-17 14:44:21 -07:00
package db
import (
"context"
"codeberg.org/u1f320/pronouns.cc/backend/log"
"emperror.dev/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
func (db *DB) initMetrics() (err error) {
err = prometheus.Register(prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "pronouns_users_total",
Help: "The total number of registered users",
}, func() float64 {
count, err := db.TotalUserCount(context.Background())
if err != nil {
log.Errorf("getting user count for metrics: %v", err)
}
return float64(count)
}))
if err != nil {
return errors.Wrap(err, "registering user count gauge")
}
err = prometheus.Register(prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "pronouns_members_total",
Help: "The total number of registered members",
}, func() float64 {
count, err := db.TotalMemberCount(context.Background())
if err != nil {
log.Errorf("getting member count for metrics: %v", err)
}
return float64(count)
}))
if err != nil {
return errors.Wrap(err, "registering member count gauge")
}
db.TotalRequests = promauto.NewCounter(prometheus.CounterOpts{
Name: "pronouns_api_requests_total",
Help: "The total number of API requests since the last restart",
})
return nil
}
func (db *DB) TotalUserCount(ctx context.Context) (numUsers int64, err error) {
err = db.QueryRow(ctx, "SELECT COUNT(*) FROM users WHERE deleted_at IS NULL").Scan(&numUsers)
if err != nil {
return 0, errors.Wrap(err, "querying user count")
}
return numUsers, nil
}
func (db *DB) TotalMemberCount(ctx context.Context) (numMembers int64, err error) {
err = db.QueryRow(ctx, "SELECT COUNT(*) FROM members WHERE unlisted = false AND user_id = ANY(SELECT id FROM users WHERE deleted_at IS NULL)").Scan(&numMembers)
if err != nil {
return 0, errors.Wrap(err, "querying member count")
}
return numMembers, nil
}