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concurrent_users.go
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concurrent_users.go
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package statscollector
import (
"context"
"fmt"
"time"
"github.com/grafana/grafana/pkg/services/sqlstore"
)
const concurrentUserStatsCacheLifetime = time.Hour
type concurrentUsersStats struct {
BucketLE3 int32 `xorm:"bucket_le_3"`
BucketLE6 int32 `xorm:"bucket_le_6"`
BucketLE9 int32 `xorm:"bucket_le_9"`
BucketLE12 int32 `xorm:"bucket_le_12"`
BucketLE15 int32 `xorm:"bucket_le_15"`
BucketLEInf int32 `xorm:"bucket_le_inf"`
}
type memoConcurrentUserStats struct {
stats *concurrentUsersStats
memoized time.Time
}
func (s *Service) concurrentUsers(ctx context.Context) (*concurrentUsersStats, error) {
memoizationPeriod := time.Now().Add(-concurrentUserStatsCacheLifetime)
if !s.concurrentUserStatsCache.memoized.Before(memoizationPeriod) {
return s.concurrentUserStatsCache.stats, nil
}
s.concurrentUserStatsCache.stats = &concurrentUsersStats{}
err := s.sqlstore.WithDbSession(ctx, func(sess *sqlstore.DBSession) error {
// Retrieves concurrent users stats as a histogram. Buckets are accumulative and upper bound is inclusive.
rawSQL := `
SELECT
COUNT(CASE WHEN tokens <= 3 THEN 1 END) AS bucket_le_3,
COUNT(CASE WHEN tokens <= 6 THEN 1 END) AS bucket_le_6,
COUNT(CASE WHEN tokens <= 9 THEN 1 END) AS bucket_le_9,
COUNT(CASE WHEN tokens <= 12 THEN 1 END) AS bucket_le_12,
COUNT(CASE WHEN tokens <= 15 THEN 1 END) AS bucket_le_15,
COUNT(1) AS bucket_le_inf
FROM (select count(1) as tokens from user_auth_token group by user_id) uat;`
_, err := sess.SQL(rawSQL).Get(s.concurrentUserStatsCache.stats)
if err != nil {
return err
}
return nil
})
if err != nil {
return nil, fmt.Errorf("failed to get concurrent users stats from database: %w", err)
}
s.concurrentUserStatsCache.memoized = time.Now()
return s.concurrentUserStatsCache.stats, nil
}