prometheus/rules/rules.go

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package rules
import (
"fmt"
"github.com/matttproud/prometheus/model"
"github.com/matttproud/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) ast.Vector {
return rule.vector.Eval(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["metric"] = 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,
}
}