mirror of
https://github.com/grafana/grafana.git
synced 2024-12-02 13:39:19 -06:00
296 lines
10 KiB
Go
296 lines
10 KiB
Go
package alerting
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import (
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"context"
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"errors"
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"fmt"
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"time"
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"github.com/benbjohnson/clock"
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"github.com/prometheus/client_golang/prometheus"
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"go.opentelemetry.io/otel/attribute"
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"golang.org/x/sync/errgroup"
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"github.com/grafana/grafana/pkg/infra/localcache"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/infra/tracing"
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"github.com/grafana/grafana/pkg/infra/usagestats"
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"github.com/grafana/grafana/pkg/infra/usagestats/validator"
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"github.com/grafana/grafana/pkg/services/annotations"
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"github.com/grafana/grafana/pkg/services/dashboards"
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"github.com/grafana/grafana/pkg/services/datasources"
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"github.com/grafana/grafana/pkg/services/encryption"
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"github.com/grafana/grafana/pkg/services/notifications"
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"github.com/grafana/grafana/pkg/services/rendering"
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"github.com/grafana/grafana/pkg/services/validations"
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"github.com/grafana/grafana/pkg/setting"
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"github.com/grafana/grafana/pkg/tsdb/legacydata"
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"github.com/grafana/grafana/pkg/util/ticker"
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)
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// AlertEngine is the background process that
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// schedules alert evaluations and makes sure notifications
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// are sent.
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type AlertEngine struct {
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RenderService rendering.Service
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RequestValidator validations.PluginRequestValidator
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DataService legacydata.RequestHandler
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Cfg *setting.Cfg
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execQueue chan *Job
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ticker *ticker.T
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scheduler scheduler
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evalHandler evalHandler
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ruleReader ruleReader
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log log.Logger
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resultHandler resultHandler
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usageStatsService usagestats.Service
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validator validator.Service
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tracer tracing.Tracer
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AlertStore AlertStore
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dashAlertExtractor DashAlertExtractor
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dashboardService dashboards.DashboardService
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datasourceService datasources.DataSourceService
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annotationsRepo annotations.Repository
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}
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// IsDisabled returns true if the alerting service is disabled for this instance.
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func (e *AlertEngine) IsDisabled() bool {
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return setting.AlertingEnabled == nil || !*setting.AlertingEnabled || !setting.ExecuteAlerts || e.Cfg.UnifiedAlerting.IsEnabled()
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}
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// ProvideAlertEngine returns a new AlertEngine.
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func ProvideAlertEngine(renderer rendering.Service, requestValidator validations.PluginRequestValidator,
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dataService legacydata.RequestHandler, usageStatsService usagestats.Service, validator validator.Service, encryptionService encryption.Internal,
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notificationService *notifications.NotificationService, tracer tracing.Tracer, store AlertStore, cfg *setting.Cfg,
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dashAlertExtractor DashAlertExtractor, dashboardService dashboards.DashboardService, cacheService *localcache.CacheService, dsService datasources.DataSourceService, annotationsRepo annotations.Repository) *AlertEngine {
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e := &AlertEngine{
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Cfg: cfg,
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RenderService: renderer,
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RequestValidator: requestValidator,
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DataService: dataService,
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usageStatsService: usageStatsService,
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validator: validator,
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tracer: tracer,
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AlertStore: store,
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dashAlertExtractor: dashAlertExtractor,
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dashboardService: dashboardService,
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datasourceService: dsService,
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annotationsRepo: annotationsRepo,
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}
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e.execQueue = make(chan *Job, 1000)
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e.scheduler = newScheduler()
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e.evalHandler = NewEvalHandler(e.DataService)
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e.ruleReader = newRuleReader(store)
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e.log = log.New("alerting.engine")
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e.resultHandler = newResultHandler(e.RenderService, store, notificationService, encryptionService.GetDecryptedValue)
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e.registerUsageMetrics()
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return e
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}
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// Run starts the alerting service background process.
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func (e *AlertEngine) Run(ctx context.Context) error {
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reg := prometheus.WrapRegistererWithPrefix("legacy_", prometheus.DefaultRegisterer)
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e.ticker = ticker.New(clock.New(), 1*time.Second, ticker.NewMetrics(reg, "alerting"))
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defer e.ticker.Stop()
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alertGroup, ctx := errgroup.WithContext(ctx)
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alertGroup.Go(func() error { return e.alertingTicker(ctx) })
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alertGroup.Go(func() error { return e.runJobDispatcher(ctx) })
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err := alertGroup.Wait()
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return err
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}
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func (e *AlertEngine) alertingTicker(grafanaCtx context.Context) error {
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defer func() {
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if err := recover(); err != nil {
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e.log.Error("Scheduler Panic: stopping alertingTicker", "error", err, "stack", log.Stack(1))
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}
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}()
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tickIndex := 0
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for {
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select {
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case <-grafanaCtx.Done():
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return grafanaCtx.Err()
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case tick := <-e.ticker.C:
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// TEMP SOLUTION update rules ever tenth tick
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if tickIndex%10 == 0 {
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e.scheduler.Update(e.ruleReader.fetch(grafanaCtx))
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}
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e.scheduler.Tick(tick, e.execQueue)
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tickIndex++
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}
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}
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}
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func (e *AlertEngine) runJobDispatcher(grafanaCtx context.Context) error {
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dispatcherGroup, alertCtx := errgroup.WithContext(grafanaCtx)
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for {
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select {
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case <-grafanaCtx.Done():
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return dispatcherGroup.Wait()
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case job := <-e.execQueue:
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dispatcherGroup.Go(func() error { return e.processJobWithRetry(alertCtx, job) })
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}
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}
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}
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var (
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unfinishedWorkTimeout = time.Second * 5
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)
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func (e *AlertEngine) processJobWithRetry(grafanaCtx context.Context, job *Job) error {
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defer func() {
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if err := recover(); err != nil {
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e.log.Error("Alert Panic", "error", err, "stack", log.Stack(1))
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}
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}()
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cancelChan := make(chan context.CancelFunc, setting.AlertingMaxAttempts*2)
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attemptChan := make(chan int, 1)
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// Initialize with first attemptID=1
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attemptChan <- 1
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job.SetRunning(true)
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for {
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select {
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case <-grafanaCtx.Done():
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// In case grafana server context is cancel, let a chance to job processing
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// to finish gracefully - by waiting a timeout duration - before forcing its end.
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unfinishedWorkTimer := time.NewTimer(unfinishedWorkTimeout)
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select {
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case <-unfinishedWorkTimer.C:
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return e.endJob(grafanaCtx.Err(), cancelChan, job)
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case <-attemptChan:
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return e.endJob(nil, cancelChan, job)
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}
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case attemptID, more := <-attemptChan:
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if !more {
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return e.endJob(nil, cancelChan, job)
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}
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go e.processJob(attemptID, attemptChan, cancelChan, job)
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}
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}
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}
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func (e *AlertEngine) endJob(err error, cancelChan chan context.CancelFunc, job *Job) error {
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job.SetRunning(false)
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close(cancelChan)
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for cancelFn := range cancelChan {
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cancelFn()
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}
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return err
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}
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func (e *AlertEngine) processJob(attemptID int, attemptChan chan int, cancelChan chan context.CancelFunc, job *Job) {
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defer func() {
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if err := recover(); err != nil {
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e.log.Error("Alert Panic", "error", err, "stack", log.Stack(1))
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}
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}()
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alertCtx, cancelFn := context.WithTimeout(context.Background(), setting.AlertingEvaluationTimeout)
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cancelChan <- cancelFn
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alertCtx, span := e.tracer.Start(alertCtx, "alert execution")
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evalContext := NewEvalContext(alertCtx, job.Rule, e.RequestValidator, e.AlertStore, e.dashboardService, e.datasourceService, e.annotationsRepo)
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evalContext.Ctx = alertCtx
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go func() {
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defer func() {
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if err := recover(); err != nil {
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e.log.Error("Alert Panic", "error", err, "stack", log.Stack(1))
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span.RecordError(fmt.Errorf("%v", err))
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span.AddEvents(
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[]string{"error", "message"},
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[]tracing.EventValue{
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{Str: fmt.Sprintf("%v", err)},
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{Str: "failed to execute alert rule. panic was recovered."},
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})
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span.End()
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close(attemptChan)
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}
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}()
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e.evalHandler.Eval(evalContext)
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span.SetAttributes("alertId", evalContext.Rule.ID, attribute.Key("alertId").Int64(evalContext.Rule.ID))
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span.SetAttributes("dashboardId", evalContext.Rule.DashboardID, attribute.Key("dashboardId").Int64(evalContext.Rule.DashboardID))
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span.SetAttributes("firing", evalContext.Firing, attribute.Key("firing").Bool(evalContext.Firing))
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span.SetAttributes("nodatapoints", evalContext.NoDataFound, attribute.Key("nodatapoints").Bool(evalContext.NoDataFound))
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span.SetAttributes("attemptID", attemptID, attribute.Key("attemptID").Int(attemptID))
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if evalContext.Error != nil {
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span.RecordError(evalContext.Error)
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span.AddEvents(
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[]string{"error", "message"},
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[]tracing.EventValue{
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{Str: fmt.Sprintf("%v", evalContext.Error)},
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{Str: "alerting execution attempt failed"},
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})
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if attemptID < setting.AlertingMaxAttempts {
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span.End()
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e.log.Debug("Job Execution attempt triggered retry", "timeMs", evalContext.GetDurationMs(), "alertId", evalContext.Rule.ID, "name", evalContext.Rule.Name, "firing", evalContext.Firing, "attemptID", attemptID)
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attemptChan <- (attemptID + 1)
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return
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}
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}
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// create new context with timeout for notifications
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resultHandleCtx, resultHandleCancelFn := context.WithTimeout(context.Background(), setting.AlertingNotificationTimeout)
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cancelChan <- resultHandleCancelFn
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// override the context used for evaluation with a new context for notifications.
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// This makes it possible for notifiers to execute when datasources
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// don't respond within the timeout limit. We should rewrite this so notifications
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// don't reuse the evalContext and get its own context.
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evalContext.Ctx = resultHandleCtx
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evalContext.Rule.State = evalContext.GetNewState()
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if err := e.resultHandler.handle(evalContext); err != nil {
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switch {
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case errors.Is(err, context.Canceled):
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e.log.Debug("Result handler returned context.Canceled")
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case errors.Is(err, context.DeadlineExceeded):
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e.log.Debug("Result handler returned context.DeadlineExceeded")
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default:
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e.log.Error("Failed to handle result", "err", err)
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}
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}
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span.End()
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e.log.Debug("Job Execution completed", "timeMs", evalContext.GetDurationMs(), "alertId", evalContext.Rule.ID, "name", evalContext.Rule.Name, "firing", evalContext.Firing, "attemptID", attemptID)
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close(attemptChan)
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}()
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}
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func (e *AlertEngine) registerUsageMetrics() {
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e.usageStatsService.RegisterMetricsFunc(func(ctx context.Context) (map[string]interface{}, error) {
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alertingUsageStats, err := e.QueryUsageStats(ctx)
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if err != nil {
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return nil, err
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}
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alertingOtherCount := 0
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metrics := map[string]interface{}{}
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for dsType, usageCount := range alertingUsageStats.DatasourceUsage {
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if e.validator.ShouldBeReported(ctx, dsType) {
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metrics[fmt.Sprintf("stats.alerting.ds.%s.count", dsType)] = usageCount
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} else {
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alertingOtherCount += usageCount
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}
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}
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metrics["stats.alerting.ds.other.count"] = alertingOtherCount
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return metrics, nil
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})
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}
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