forked from prometheus-community/prom-label-proxy
/
inject.go
93 lines (75 loc) · 2.14 KB
/
inject.go
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package injectproxy
import (
"fmt"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/promql"
)
func SetRecursive(node promql.Node, matchersToEnforce []*labels.Matcher) (err error) {
switch n := node.(type) {
case *promql.EvalStmt:
if err := SetRecursive(n.Expr, matchersToEnforce); err != nil {
return err
}
case promql.Expressions:
for _, e := range n {
if err := SetRecursive(e, matchersToEnforce); err != nil {
return err
}
}
case *promql.AggregateExpr:
if err := SetRecursive(n.Expr, matchersToEnforce); err != nil {
return err
}
case *promql.BinaryExpr:
if err := SetRecursive(n.LHS, matchersToEnforce); err != nil {
return err
}
if err := SetRecursive(n.RHS, matchersToEnforce); err != nil {
return err
}
case *promql.Call:
if err := SetRecursive(n.Args, matchersToEnforce); err != nil {
return err
}
case *promql.ParenExpr:
if err := SetRecursive(n.Expr, matchersToEnforce); err != nil {
return err
}
case *promql.UnaryExpr:
if err := SetRecursive(n.Expr, matchersToEnforce); err != nil {
return err
}
case *promql.SubqueryExpr:
if err := SetRecursive(n.Expr, matchersToEnforce); err != nil {
return err
}
case *promql.NumberLiteral, *promql.StringLiteral:
// nothing to do
case *promql.MatrixSelector:
// inject labelselector
n.LabelMatchers = enforceLabelMatchers(n.LabelMatchers, matchersToEnforce)
case *promql.VectorSelector:
// inject labelselector
n.LabelMatchers = enforceLabelMatchers(n.LabelMatchers, matchersToEnforce)
default:
panic(fmt.Errorf("promql.Walk: unhandled node type %T", node))
}
return err
}
func enforceLabelMatchers(matchers []*labels.Matcher, matchersToEnforce []*labels.Matcher) []*labels.Matcher {
res := []*labels.Matcher{}
for _, m := range matchersToEnforce {
res = enforceLabelMatcher(matchers, m)
}
return res
}
func enforceLabelMatcher(matchers []*labels.Matcher, enforcedMatcher *labels.Matcher) []*labels.Matcher {
res := []*labels.Matcher{}
for _, m := range matchers {
if m.Name == enforcedMatcher.Name {
continue
}
res = append(res, m)
}
return append(res, enforcedMatcher)
}