mirror of
https://github.com/prometheus/prometheus.git
synced 2025-10-31 00:11:23 +01:00
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
// Copyright 2013 Prometheus Team
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package rules
|
|
|
|
import (
|
|
"fmt"
|
|
"github.com/prometheus/prometheus/model"
|
|
"github.com/prometheus/prometheus/rules/ast"
|
|
"time"
|
|
)
|
|
|
|
// A recorded rule.
|
|
type Rule struct {
|
|
name string
|
|
vector ast.VectorNode
|
|
labels model.LabelSet
|
|
permanent bool
|
|
}
|
|
|
|
func (rule *Rule) Name() string { return rule.name }
|
|
|
|
func (rule *Rule) EvalRaw(timestamp *time.Time) (vector ast.Vector) {
|
|
return ast.EvalVectorInstant(rule.vector, *timestamp)
|
|
}
|
|
|
|
func (rule *Rule) Eval(timestamp *time.Time) ast.Vector {
|
|
// Get the raw value of the rule expression.
|
|
vector := rule.EvalRaw(timestamp)
|
|
|
|
// Override the metric name and labels.
|
|
for _, sample := range vector {
|
|
sample.Metric[model.MetricNameLabel] = model.LabelValue(rule.name)
|
|
for label, value := range rule.labels {
|
|
if value == "" {
|
|
delete(sample.Metric, label)
|
|
} else {
|
|
sample.Metric[label] = value
|
|
}
|
|
}
|
|
}
|
|
return vector
|
|
}
|
|
|
|
func (rule *Rule) RuleToDotGraph() string {
|
|
graph := "digraph \"Rules\" {\n"
|
|
graph += fmt.Sprintf("%#p[shape=\"box\",label=\"%v = \"];\n", rule, rule.name)
|
|
graph += fmt.Sprintf("%#p -> %#p;\n", rule, rule.vector)
|
|
graph += rule.vector.NodeTreeToDotGraph()
|
|
graph += "}\n"
|
|
return graph
|
|
}
|
|
|
|
func NewRule(name string, labels model.LabelSet, vector ast.VectorNode, permanent bool) *Rule {
|
|
return &Rule{
|
|
name: name,
|
|
labels: labels,
|
|
vector: vector,
|
|
permanent: permanent,
|
|
}
|
|
}
|