mirror of https://github.com/grafana/grafana.git
85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
package alerting
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import (
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"math"
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"time"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/models"
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"github.com/grafana/grafana/pkg/setting"
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)
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type schedulerImpl struct {
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jobs map[int64]*Job
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log log.Logger
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}
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func newScheduler() scheduler {
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return &schedulerImpl{
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jobs: make(map[int64]*Job),
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log: log.New("alerting.scheduler"),
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}
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}
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func (s *schedulerImpl) Update(rules []*Rule) {
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s.log.Debug("Scheduling update", "ruleCount", len(rules))
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jobs := make(map[int64]*Job)
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for i, rule := range rules {
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var job *Job
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if s.jobs[rule.ID] != nil {
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job = s.jobs[rule.ID]
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} else {
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job = &Job{}
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job.SetRunning(false)
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}
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job.Rule = rule
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offset := ((rule.Frequency * 1000) / int64(len(rules))) * int64(i)
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job.Offset = int64(math.Floor(float64(offset) / 1000))
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if job.Offset == 0 { // zero offset causes division with 0 panics.
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job.Offset = 1
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}
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jobs[rule.ID] = job
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}
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s.jobs = jobs
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}
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func (s *schedulerImpl) Tick(tickTime time.Time, execQueue chan *Job) {
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now := tickTime.Unix()
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for _, job := range s.jobs {
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if job.GetRunning() || job.Rule.State == models.AlertStatePaused {
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continue
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}
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if job.OffsetWait && now%job.Offset == 0 {
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job.OffsetWait = false
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s.enqueue(job, execQueue)
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continue
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}
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// Check the job frequency against the minimum interval required
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interval := job.Rule.Frequency
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if interval < setting.AlertingMinInterval {
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interval = setting.AlertingMinInterval
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}
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if now%interval == 0 {
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if job.Offset > 0 {
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job.OffsetWait = true
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} else {
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s.enqueue(job, execQueue)
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}
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}
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}
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}
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func (s *schedulerImpl) enqueue(job *Job, execQueue chan *Job) {
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s.log.Debug("Scheduler: Putting job on to exec queue", "name", job.Rule.Name, "id", job.Rule.ID)
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execQueue <- job
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}
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