prometheus/rules/ast/printer.go
2013-02-07 11:49:04 +01:00

312 lines
7.8 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 ast
import (
"encoding/json"
"fmt"
"sort"
"strings"
"time"
)
type OutputFormat int
const (
TEXT OutputFormat = iota
JSON
)
func binOpTypeToString(opType BinOpType) string {
opTypeMap := map[BinOpType]string{
ADD: "+",
SUB: "-",
MUL: "*",
DIV: "/",
MOD: "%",
GT: ">",
LT: "<",
EQ: "==",
NE: "!=",
GE: ">=",
LE: "<=",
}
return opTypeMap[opType]
}
func aggrTypeToString(aggrType AggrType) string {
aggrTypeMap := map[AggrType]string{
SUM: "SUM",
AVG: "AVG",
MIN: "MIN",
MAX: "MAX",
}
return aggrTypeMap[aggrType]
}
func exprTypeToString(exprType ExprType) string {
exprTypeMap := map[ExprType]string{
SCALAR: "scalar",
VECTOR: "vector",
MATRIX: "matrix",
STRING: "string",
}
return exprTypeMap[exprType]
}
func durationToString(duration time.Duration) string {
seconds := int64(duration / time.Second)
factors := map[string]int64{
"y": 60 * 60 * 24 * 365,
"d": 60 * 60 * 24,
"h": 60 * 60,
"m": 60,
"s": 1,
}
unit := "s"
switch int64(0) {
case seconds % factors["y"]:
unit = "y"
case seconds % factors["d"]:
unit = "d"
case seconds % factors["h"]:
unit = "h"
case seconds % factors["m"]:
unit = "m"
}
return fmt.Sprintf("%v%v", seconds/factors[unit], unit)
}
func (vector Vector) ToString() string {
metricStrings := []string{}
for _, sample := range vector {
metricName, ok := sample.Metric["name"]
if !ok {
panic("Tried to print vector without metric name")
}
labelStrings := []string{}
for label, value := range sample.Metric {
if label != "name" {
// TODO escape special chars in label values here and elsewhere.
labelStrings = append(labelStrings, fmt.Sprintf("%v='%v'", label, value))
}
}
sort.Strings(labelStrings)
metricStrings = append(metricStrings,
fmt.Sprintf("%v{%v} => %v @[%v]",
metricName,
strings.Join(labelStrings, ","),
sample.Value, sample.Timestamp))
}
sort.Strings(metricStrings)
return strings.Join(metricStrings, "\n")
}
func (matrix Matrix) ToString() string {
metricStrings := []string{}
for _, sampleSet := range matrix {
metricName, ok := sampleSet.Metric["name"]
if !ok {
panic("Tried to print matrix without metric name")
}
labelStrings := []string{}
for label, value := range sampleSet.Metric {
if label != "name" {
labelStrings = append(labelStrings, fmt.Sprintf("%v='%v'", label, value))
}
}
sort.Strings(labelStrings)
valueStrings := []string{}
for _, value := range sampleSet.Values {
valueStrings = append(valueStrings,
fmt.Sprintf("\n%v @[%v]", value.Value, value.Timestamp))
}
metricStrings = append(metricStrings,
fmt.Sprintf("%v{%v} => %v",
metricName,
strings.Join(labelStrings, ","),
strings.Join(valueStrings, ", ")))
}
sort.Strings(metricStrings)
return strings.Join(metricStrings, "\n")
}
func ErrorToJSON(err error) string {
errorStruct := struct {
Type string
Value string
}{
Type: "error",
Value: err.Error(),
}
errorJSON, err := json.MarshalIndent(errorStruct, "", "\t")
if err != nil {
return ""
}
return string(errorJSON)
}
func TypedValueToJSON(data interface{}, typeStr string) string {
dataStruct := struct {
Type string
Value interface{}
}{
Type: typeStr,
Value: data,
}
dataJSON, err := json.MarshalIndent(dataStruct, "", "\t")
if err != nil {
return ErrorToJSON(err)
}
return string(dataJSON)
}
func EvalToString(node Node, timestamp *time.Time, format OutputFormat) string {
switch node.Type() {
case SCALAR:
scalar := node.(ScalarNode).Eval(timestamp)
switch format {
case TEXT:
return fmt.Sprintf("scalar: %v", scalar)
case JSON:
return TypedValueToJSON(scalar, "scalar")
}
case VECTOR:
vector := node.(VectorNode).Eval(timestamp)
switch format {
case TEXT:
return vector.ToString()
case JSON:
return TypedValueToJSON(vector, "vector")
}
case MATRIX:
matrix := node.(MatrixNode).Eval(timestamp)
switch format {
case TEXT:
return matrix.ToString()
case JSON:
return TypedValueToJSON(matrix, "matrix")
}
case STRING:
str := node.(StringNode).Eval(timestamp)
switch format {
case TEXT:
return str
case JSON:
return TypedValueToJSON(str, "string")
}
}
panic("Switch didn't cover all node types")
}
func (node *VectorLiteral) ToString() string {
metricName, ok := node.labels["name"]
if !ok {
panic("Tried to print vector without metric name")
}
labelStrings := []string{}
for label, value := range node.labels {
if label != "name" {
labelStrings = append(labelStrings, fmt.Sprintf("%v='%v'", label, value))
}
}
sort.Strings(labelStrings)
return fmt.Sprintf("%v{%v}", metricName, strings.Join(labelStrings, ","))
}
func (node *MatrixLiteral) ToString() string {
vectorString := (&VectorLiteral{labels: node.labels}).ToString()
intervalString := fmt.Sprintf("['%v']", durationToString(node.interval))
return vectorString + intervalString
}
func (node *ScalarLiteral) NodeTreeToDotGraph() string {
return fmt.Sprintf("%#p[label=\"%v\"];\n", node, node.value)
}
func functionArgsToDotGraph(node Node, args []Node) string {
graph := ""
for _, arg := range args {
graph += fmt.Sprintf("%#p -> %#p;\n", node, arg)
}
for _, arg := range args {
graph += arg.NodeTreeToDotGraph()
}
return graph
}
func (node *ScalarFunctionCall) NodeTreeToDotGraph() string {
graph := fmt.Sprintf("%#p[label=\"%v\"];\n", node, node.function.name)
graph += functionArgsToDotGraph(node, node.args)
return graph
}
func (node *ScalarArithExpr) NodeTreeToDotGraph() string {
graph := fmt.Sprintf("%#p[label=\"%v\"];\n", node, binOpTypeToString(node.opType))
graph += fmt.Sprintf("%#p -> %#p;\n", node, node.lhs)
graph += fmt.Sprintf("%#p -> %#p;\n", node, node.rhs)
graph += node.lhs.NodeTreeToDotGraph()
graph += node.rhs.NodeTreeToDotGraph()
return graph
}
func (node *VectorLiteral) NodeTreeToDotGraph() string {
return fmt.Sprintf("%#p[label=\"%v\"];\n", node, node.ToString())
}
func (node *VectorFunctionCall) NodeTreeToDotGraph() string {
graph := fmt.Sprintf("%#p[label=\"%v\"];\n", node, node.function.name)
graph += functionArgsToDotGraph(node, node.args)
return graph
}
func (node *VectorAggregation) NodeTreeToDotGraph() string {
groupByStrings := []string{}
for _, label := range node.groupBy {
groupByStrings = append(groupByStrings, string(label))
}
graph := fmt.Sprintf("%#p[label=\"%v BY (%v)\"]\n",
node,
aggrTypeToString(node.aggrType),
strings.Join(groupByStrings, ", "))
graph += fmt.Sprintf("%#p -> %#p;\n", node, node.vector)
graph += node.vector.NodeTreeToDotGraph()
return graph
}
func (node *VectorArithExpr) NodeTreeToDotGraph() string {
graph := fmt.Sprintf("%#p[label=\"%v\"];\n", node, binOpTypeToString(node.opType))
graph += fmt.Sprintf("%#p -> %#p;\n", node, node.lhs)
graph += fmt.Sprintf("%#p -> %#p;\n", node, node.rhs)
graph += node.lhs.NodeTreeToDotGraph()
graph += node.rhs.NodeTreeToDotGraph()
return graph
}
func (node *MatrixLiteral) NodeTreeToDotGraph() string {
return fmt.Sprintf("%#p[label=\"%v\"];\n", node, node.ToString())
}
func (node *StringLiteral) NodeTreeToDotGraph() string {
return fmt.Sprintf("%#p[label=\"'%v'\"];\n", node.str)
}
func (node *StringFunctionCall) NodeTreeToDotGraph() string {
graph := fmt.Sprintf("%#p[label=\"%v\"];\n", node, node.function.name)
graph += functionArgsToDotGraph(node, node.args)
return graph
}