mirror of
https://github.com/prometheus/prometheus
synced 2024-12-26 00:23:18 +00:00
338 lines
9.0 KiB
Go
338 lines
9.0 KiB
Go
// Copyright 2013 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 template
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"net/url"
|
|
"regexp"
|
|
"sort"
|
|
"strings"
|
|
"time"
|
|
|
|
html_template "html/template"
|
|
text_template "text/template"
|
|
|
|
"github.com/prometheus/common/model"
|
|
|
|
"github.com/prometheus/prometheus/promql"
|
|
"github.com/prometheus/prometheus/util/strutil"
|
|
)
|
|
|
|
// A version of vector that's easier to use from templates.
|
|
type sample struct {
|
|
Labels map[string]string
|
|
Value float64
|
|
}
|
|
type queryResult []*sample
|
|
|
|
type queryResultByLabelSorter struct {
|
|
results queryResult
|
|
by string
|
|
}
|
|
|
|
func (q queryResultByLabelSorter) Len() int {
|
|
return len(q.results)
|
|
}
|
|
|
|
func (q queryResultByLabelSorter) Less(i, j int) bool {
|
|
return q.results[i].Labels[q.by] < q.results[j].Labels[q.by]
|
|
}
|
|
|
|
func (q queryResultByLabelSorter) Swap(i, j int) {
|
|
q.results[i], q.results[j] = q.results[j], q.results[i]
|
|
}
|
|
|
|
// QueryFunc executes a PromQL query at the given time.
|
|
type QueryFunc func(context.Context, string, time.Time) (promql.Vector, error)
|
|
|
|
func query(ctx context.Context, q string, ts time.Time, queryFn QueryFunc) (queryResult, error) {
|
|
vector, err := queryFn(ctx, q, ts)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// promql.Vector is hard to work with in templates, so convert to
|
|
// base data types.
|
|
// TODO(fabxc): probably not true anymore after type rework.
|
|
var result = make(queryResult, len(vector))
|
|
for n, v := range vector {
|
|
s := sample{
|
|
Value: v.V,
|
|
Labels: v.Metric.Map(),
|
|
}
|
|
result[n] = &s
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
// Expander executes templates in text or HTML mode with a common set of Prometheus template functions.
|
|
type Expander struct {
|
|
text string
|
|
name string
|
|
data interface{}
|
|
funcMap text_template.FuncMap
|
|
}
|
|
|
|
// NewTemplateExpander returns a template expander ready to use.
|
|
func NewTemplateExpander(
|
|
ctx context.Context,
|
|
text string,
|
|
name string,
|
|
data interface{},
|
|
timestamp model.Time,
|
|
queryFunc QueryFunc,
|
|
externalURL *url.URL,
|
|
) *Expander {
|
|
return &Expander{
|
|
text: text,
|
|
name: name,
|
|
data: data,
|
|
funcMap: text_template.FuncMap{
|
|
"query": func(q string) (queryResult, error) {
|
|
return query(ctx, q, timestamp.Time(), queryFunc)
|
|
},
|
|
"first": func(v queryResult) (*sample, error) {
|
|
if len(v) > 0 {
|
|
return v[0], nil
|
|
}
|
|
return nil, errors.New("first() called on vector with no elements")
|
|
},
|
|
"label": func(label string, s *sample) string {
|
|
return s.Labels[label]
|
|
},
|
|
"value": func(s *sample) float64 {
|
|
return s.Value
|
|
},
|
|
"strvalue": func(s *sample) string {
|
|
return s.Labels["__value__"]
|
|
},
|
|
"args": func(args ...interface{}) map[string]interface{} {
|
|
result := make(map[string]interface{})
|
|
for i, a := range args {
|
|
result[fmt.Sprintf("arg%d", i)] = a
|
|
}
|
|
return result
|
|
},
|
|
"reReplaceAll": func(pattern, repl, text string) string {
|
|
re := regexp.MustCompile(pattern)
|
|
return re.ReplaceAllString(text, repl)
|
|
},
|
|
"safeHtml": func(text string) html_template.HTML {
|
|
return html_template.HTML(text)
|
|
},
|
|
"match": regexp.MatchString,
|
|
"title": strings.Title,
|
|
"toUpper": strings.ToUpper,
|
|
"toLower": strings.ToLower,
|
|
"graphLink": strutil.GraphLinkForExpression,
|
|
"tableLink": strutil.TableLinkForExpression,
|
|
"sortByLabel": func(label string, v queryResult) queryResult {
|
|
sorter := queryResultByLabelSorter{v[:], label}
|
|
sort.Stable(sorter)
|
|
return v
|
|
},
|
|
"humanize": func(v float64) string {
|
|
if v == 0 || math.IsNaN(v) || math.IsInf(v, 0) {
|
|
return fmt.Sprintf("%.4g", v)
|
|
}
|
|
if math.Abs(v) >= 1 {
|
|
prefix := ""
|
|
for _, p := range []string{"k", "M", "G", "T", "P", "E", "Z", "Y"} {
|
|
if math.Abs(v) < 1000 {
|
|
break
|
|
}
|
|
prefix = p
|
|
v /= 1000
|
|
}
|
|
return fmt.Sprintf("%.4g%s", v, prefix)
|
|
}
|
|
prefix := ""
|
|
for _, p := range []string{"m", "u", "n", "p", "f", "a", "z", "y"} {
|
|
if math.Abs(v) >= 1 {
|
|
break
|
|
}
|
|
prefix = p
|
|
v *= 1000
|
|
}
|
|
return fmt.Sprintf("%.4g%s", v, prefix)
|
|
},
|
|
"humanize1024": func(v float64) string {
|
|
if math.Abs(v) <= 1 || math.IsNaN(v) || math.IsInf(v, 0) {
|
|
return fmt.Sprintf("%.4g", v)
|
|
}
|
|
prefix := ""
|
|
for _, p := range []string{"ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi", "Yi"} {
|
|
if math.Abs(v) < 1024 {
|
|
break
|
|
}
|
|
prefix = p
|
|
v /= 1024
|
|
}
|
|
return fmt.Sprintf("%.4g%s", v, prefix)
|
|
},
|
|
"humanizeDuration": func(v float64) string {
|
|
if math.IsNaN(v) || math.IsInf(v, 0) {
|
|
return fmt.Sprintf("%.4g", v)
|
|
}
|
|
if v == 0 {
|
|
return fmt.Sprintf("%.4gs", v)
|
|
}
|
|
if math.Abs(v) >= 1 {
|
|
sign := ""
|
|
if v < 0 {
|
|
sign = "-"
|
|
v = -v
|
|
}
|
|
seconds := int64(v) % 60
|
|
minutes := (int64(v) / 60) % 60
|
|
hours := (int64(v) / 60 / 60) % 24
|
|
days := (int64(v) / 60 / 60 / 24)
|
|
// For days to minutes, we display seconds as an integer.
|
|
if days != 0 {
|
|
return fmt.Sprintf("%s%dd %dh %dm %ds", sign, days, hours, minutes, seconds)
|
|
}
|
|
if hours != 0 {
|
|
return fmt.Sprintf("%s%dh %dm %ds", sign, hours, minutes, seconds)
|
|
}
|
|
if minutes != 0 {
|
|
return fmt.Sprintf("%s%dm %ds", sign, minutes, seconds)
|
|
}
|
|
// For seconds, we display 4 significant digts.
|
|
return fmt.Sprintf("%s%.4gs", sign, v)
|
|
}
|
|
prefix := ""
|
|
for _, p := range []string{"m", "u", "n", "p", "f", "a", "z", "y"} {
|
|
if math.Abs(v) >= 1 {
|
|
break
|
|
}
|
|
prefix = p
|
|
v *= 1000
|
|
}
|
|
return fmt.Sprintf("%.4g%ss", v, prefix)
|
|
},
|
|
"humanizeTimestamp": func(v float64) string {
|
|
if math.IsNaN(v) || math.IsInf(v, 0) {
|
|
return fmt.Sprintf("%.4g", v)
|
|
}
|
|
t := model.TimeFromUnixNano(int64(v * 1e9)).Time().UTC()
|
|
return fmt.Sprint(t)
|
|
},
|
|
"pathPrefix": func() string {
|
|
return externalURL.Path
|
|
},
|
|
"externalURL": func() string {
|
|
return externalURL.String()
|
|
},
|
|
},
|
|
}
|
|
}
|
|
|
|
// AlertTemplateData returns the interface to be used in expanding the template.
|
|
func AlertTemplateData(labels map[string]string, value float64) interface{} {
|
|
return struct {
|
|
Labels map[string]string
|
|
Value float64
|
|
}{
|
|
Labels: labels,
|
|
Value: value,
|
|
}
|
|
}
|
|
|
|
// Funcs adds the functions in fm to the Expander's function map.
|
|
// Existing functions will be overwritten in case of conflict.
|
|
func (te Expander) Funcs(fm text_template.FuncMap) {
|
|
for k, v := range fm {
|
|
te.funcMap[k] = v
|
|
}
|
|
}
|
|
|
|
// Expand expands a template in text (non-HTML) mode.
|
|
func (te Expander) Expand() (result string, resultErr error) {
|
|
// It'd better to have no alert description than to kill the whole process
|
|
// if there's a bug in the template.
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
var ok bool
|
|
resultErr, ok = r.(error)
|
|
if !ok {
|
|
resultErr = fmt.Errorf("panic expanding template %v: %v", te.name, r)
|
|
}
|
|
}
|
|
}()
|
|
|
|
tmpl, err := text_template.New(te.name).Funcs(te.funcMap).Option("missingkey=zero").Parse(te.text)
|
|
if err != nil {
|
|
return "", fmt.Errorf("error parsing template %v: %v", te.name, err)
|
|
}
|
|
var buffer bytes.Buffer
|
|
err = tmpl.Execute(&buffer, te.data)
|
|
if err != nil {
|
|
return "", fmt.Errorf("error executing template %v: %v", te.name, err)
|
|
}
|
|
return buffer.String(), nil
|
|
}
|
|
|
|
// ExpandHTML expands a template with HTML escaping, with templates read from the given files.
|
|
func (te Expander) ExpandHTML(templateFiles []string) (result string, resultErr error) {
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
var ok bool
|
|
resultErr, ok = r.(error)
|
|
if !ok {
|
|
resultErr = fmt.Errorf("panic expanding template %v: %v", te.name, r)
|
|
}
|
|
}
|
|
}()
|
|
|
|
tmpl := html_template.New(te.name).Funcs(html_template.FuncMap(te.funcMap))
|
|
tmpl.Option("missingkey=zero")
|
|
tmpl.Funcs(html_template.FuncMap{
|
|
"tmpl": func(name string, data interface{}) (html_template.HTML, error) {
|
|
var buffer bytes.Buffer
|
|
err := tmpl.ExecuteTemplate(&buffer, name, data)
|
|
return html_template.HTML(buffer.String()), err
|
|
},
|
|
})
|
|
tmpl, err := tmpl.Parse(te.text)
|
|
if err != nil {
|
|
return "", fmt.Errorf("error parsing template %v: %v", te.name, err)
|
|
}
|
|
if len(templateFiles) > 0 {
|
|
_, err = tmpl.ParseFiles(templateFiles...)
|
|
if err != nil {
|
|
return "", fmt.Errorf("error parsing template files for %v: %v", te.name, err)
|
|
}
|
|
}
|
|
var buffer bytes.Buffer
|
|
err = tmpl.Execute(&buffer, te.data)
|
|
if err != nil {
|
|
return "", fmt.Errorf("error executing template %v: %v", te.name, err)
|
|
}
|
|
return buffer.String(), nil
|
|
}
|
|
|
|
// ParseTest parses the templates and returns the error if any.
|
|
func (te Expander) ParseTest() error {
|
|
_, err := text_template.New(te.name).Funcs(te.funcMap).Option("missingkey=zero").Parse(te.text)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|