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eval_handler.go
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/
eval_handler.go
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package alerting
import (
"strconv"
"strings"
"time"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/metrics"
)
type DefaultEvalHandler struct {
log log.Logger
alertJobTimeout time.Duration
}
func NewEvalHandler() *DefaultEvalHandler {
return &DefaultEvalHandler{
log: log.New("alerting.evalHandler"),
alertJobTimeout: time.Second * 5,
}
}
func (e *DefaultEvalHandler) Eval(context *EvalContext) {
firing := true
noDataFound := true
conditionEvals := ""
for i := 0; i < len(context.Rule.Conditions); i++ {
condition := context.Rule.Conditions[i]
cr, err := condition.Eval(context)
if err != nil {
context.Error = err
}
// break if condition could not be evaluated
if context.Error != nil {
break
}
if i == 0 {
firing = cr.Firing
noDataFound = cr.NoDataFound
}
// calculating Firing based on operator
if cr.Operator == "or" {
firing = firing || cr.Firing
noDataFound = noDataFound || cr.NoDataFound
} else {
firing = firing && cr.Firing
noDataFound = noDataFound && cr.NoDataFound
}
if i > 0 {
conditionEvals = "[" + conditionEvals + " " + strings.ToUpper(cr.Operator) + " " + strconv.FormatBool(cr.Firing) + "]"
} else {
conditionEvals = strconv.FormatBool(firing)
}
context.EvalMatches = append(context.EvalMatches, cr.EvalMatches...)
}
context.ConditionEvals = conditionEvals + " = " + strconv.FormatBool(firing)
context.Firing = firing
context.NoDataFound = noDataFound
context.EndTime = time.Now()
elapsedTime := context.EndTime.Sub(context.StartTime).Nanoseconds() / int64(time.Millisecond)
metrics.M_Alerting_Execution_Time.Observe(float64(elapsedTime))
}