prometheus/promql/printer.go

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// Copyright 2015 The Prometheus Authors
// 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 promql
import (
"fmt"
"sort"
"strings"
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"time"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
)
// Tree returns a string of the tree structure of the given node.
func Tree(node Node) string {
return tree(node, "")
}
func tree(node Node, level string) string {
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if node == nil {
return fmt.Sprintf("%s |---- %T\n", level, node)
}
typs := strings.Split(fmt.Sprintf("%T", node), ".")[1]
t := fmt.Sprintf("%s |---- %s :: %s\n", level, typs, node)
level += " · · ·"
switch n := node.(type) {
case *EvalStmt:
t += tree(n.Expr, level)
case Expressions:
for _, e := range n {
t += tree(e, level)
}
case *AggregateExpr:
t += tree(n.Expr, level)
case *BinaryExpr:
t += tree(n.LHS, level)
t += tree(n.RHS, level)
case *Call:
t += tree(n.Args, level)
case *ParenExpr:
t += tree(n.Expr, level)
case *UnaryExpr:
t += tree(n.Expr, level)
case *SubqueryExpr:
t += tree(n.Expr, level)
case *MatrixSelector, *NumberLiteral, *StringLiteral, *VectorSelector:
// nothing to do
default:
panic("promql.Tree: not all node types covered")
}
return t
}
func (node *EvalStmt) String() string {
return "EVAL " + node.Expr.String()
}
func (es Expressions) String() (s string) {
if len(es) == 0 {
return ""
}
for _, e := range es {
s += e.String()
s += ", "
}
return s[:len(s)-2]
}
func (node *AggregateExpr) String() string {
aggrString := node.Op.String()
if node.Without {
aggrString += fmt.Sprintf(" without(%s) ", strings.Join(node.Grouping, ", "))
} else {
if len(node.Grouping) > 0 {
aggrString += fmt.Sprintf(" by(%s) ", strings.Join(node.Grouping, ", "))
}
}
aggrString += "("
if node.Op.isAggregatorWithParam() {
aggrString += fmt.Sprintf("%s, ", node.Param)
}
aggrString += fmt.Sprintf("%s)", node.Expr)
return aggrString
}
func (node *BinaryExpr) String() string {
returnBool := ""
if node.ReturnBool {
returnBool = " bool"
}
matching := ""
vm := node.VectorMatching
if vm != nil && (len(vm.MatchingLabels) > 0 || vm.On) {
if vm.On {
matching = fmt.Sprintf(" on(%s)", strings.Join(vm.MatchingLabels, ", "))
} else {
matching = fmt.Sprintf(" ignoring(%s)", strings.Join(vm.MatchingLabels, ", "))
}
if vm.Card == CardManyToOne || vm.Card == CardOneToMany {
matching += " group_"
if vm.Card == CardManyToOne {
matching += "left"
} else {
matching += "right"
}
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matching += fmt.Sprintf("(%s)", strings.Join(vm.Include, ", "))
}
}
return fmt.Sprintf("%s %s%s%s %s", node.LHS, node.Op, returnBool, matching, node.RHS)
}
func (node *Call) String() string {
return fmt.Sprintf("%s(%s)", node.Func.Name, node.Args)
}
func (node *MatrixSelector) String() string {
vecSelector := &VectorSelector{
Name: node.Name,
LabelMatchers: node.LabelMatchers,
}
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offset := ""
if node.Offset != time.Duration(0) {
offset = fmt.Sprintf(" offset %s", model.Duration(node.Offset))
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}
return fmt.Sprintf("%s[%s]%s", vecSelector.String(), model.Duration(node.Range), offset)
}
func (node *SubqueryExpr) String() string {
step := ""
if node.Step != 0 {
step = model.Duration(node.Step).String()
}
return fmt.Sprintf("%s[%s:%s]", node.Expr.String(), model.Duration(node.Range), step)
}
func (node *NumberLiteral) String() string {
return fmt.Sprint(node.Val)
}
func (node *ParenExpr) String() string {
return fmt.Sprintf("(%s)", node.Expr)
}
func (node *StringLiteral) String() string {
return fmt.Sprintf("%q", node.Val)
}
func (node *UnaryExpr) String() string {
return fmt.Sprintf("%s%s", node.Op, node.Expr)
}
func (node *VectorSelector) String() string {
labelStrings := make([]string, 0, len(node.LabelMatchers)-1)
for _, matcher := range node.LabelMatchers {
// Only include the __name__ label if its equality matching and matches the name.
if matcher.Name == labels.MetricName && matcher.Type == labels.MatchEqual && matcher.Value == node.Name {
continue
}
labelStrings = append(labelStrings, matcher.String())
}
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offset := ""
if node.Offset != time.Duration(0) {
offset = fmt.Sprintf(" offset %s", model.Duration(node.Offset))
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}
if len(labelStrings) == 0 {
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return fmt.Sprintf("%s%s", node.Name, offset)
}
sort.Strings(labelStrings)
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return fmt.Sprintf("%s{%s}%s", node.Name, strings.Join(labelStrings, ","), offset)
}