mirror of
https://github.com/grafana/grafana.git
synced 2024-11-23 09:26:43 -06:00
baab021fec
Refactor usage of legacy data contracts. Moves legacy data contracts to pkg/tsdb/legacydata package. Refactor pkg/expr to be a proper service/dependency that can be provided to wire to remove some unneeded dependencies to SSE in ngalert and other places. Refactor pkg/expr to not use the legacydata,RequestHandler and use backend.QueryDataHandler instead.
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
package alerting
|
|
|
|
import (
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/grafana/grafana/pkg/infra/log"
|
|
"github.com/grafana/grafana/pkg/infra/metrics"
|
|
"github.com/grafana/grafana/pkg/tsdb/legacydata"
|
|
)
|
|
|
|
// DefaultEvalHandler is responsible for evaluating the alert rule.
|
|
type DefaultEvalHandler struct {
|
|
log log.Logger
|
|
alertJobTimeout time.Duration
|
|
requestHandler legacydata.RequestHandler
|
|
}
|
|
|
|
// NewEvalHandler is the `DefaultEvalHandler` constructor.
|
|
func NewEvalHandler(requestHandler legacydata.RequestHandler) *DefaultEvalHandler {
|
|
return &DefaultEvalHandler{
|
|
log: log.New("alerting.evalHandler"),
|
|
alertJobTimeout: time.Second * 5,
|
|
requestHandler: requestHandler,
|
|
}
|
|
}
|
|
|
|
// Eval evaluated the alert rule.
|
|
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, e.requestHandler)
|
|
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
|
|
} else {
|
|
firing = firing && cr.Firing
|
|
}
|
|
|
|
// We cannot evaluate the expression when one or more conditions are missing data
|
|
// and so noDataFound should be true if at least one condition returns no data,
|
|
// irrespective of the operator.
|
|
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.MAlertingExecutionTime.Observe(float64(elapsedTime))
|
|
}
|