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// Copyright 2021 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 cli
import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"time"
"github.com/alecthomas/kingpin/v2"
"github.com/prometheus/common/model"
"github.com/prometheus/alertmanager/template"
)
var defaultData = template.Data{
Receiver: "receiver",
Status: "alertstatus",
Alerts: template.Alerts{
template.Alert{
Status: string(model.AlertFiring),
Labels: template.KV{
"label1": "value1",
"label2": "value2",
"instance": "foo.bar:1234",
"commonlabelkey1": "commonlabelvalue1",
"commonlabelkey2": "commonlabelvalue2",
},
Annotations: template.KV{
"annotation1": "value1",
"annotation2": "value2",
"commonannotationkey1": "commonannotationvalue1",
"commonannotationkey2": "commonannotationvalue2",
},
StartsAt: time.Now().Add(-5 * time.Minute),
EndsAt: time.Now(),
GeneratorURL: "https://generatorurl.com",
Fingerprint: "fingerprint1",
},
template.Alert{
Status: string(model.AlertResolved),
Labels: template.KV{
"foo": "bar",
"baz": "qux",
"commonlabelkey1": "commonlabelvalue1",
"commonlabelkey2": "commonlabelvalue2",
},
Annotations: template.KV{
"aaa": "bbb",
"ccc": "ddd",
"commonannotationkey1": "commonannotationvalue1",
"commonannotationkey2": "commonannotationvalue2",
},
StartsAt: time.Now().Add(-10 * time.Minute),
EndsAt: time.Now(),
GeneratorURL: "https://generatorurl.com",
Fingerprint: "fingerprint2",
},
},
GroupLabels: template.KV{
"grouplabelkey1": "grouplabelvalue1",
"grouplabelkey2": "grouplabelvalue2",
},
CommonLabels: template.KV{
"commonlabelkey1": "commonlabelvalue1",
"commonlabelkey2": "commonlabelvalue2",
},
CommonAnnotations: template.KV{
"commonannotationkey1": "commonannotationvalue1",
"commonannotationkey2": "commonannotationvalue2",
},
ExternalURL: "https://example.com",
}
type templateRenderCmd struct {
templateFilesGlobs []string
templateType string
templateText string
templateData *os.File
}
func configureTemplateRenderCmd(cc *kingpin.CmdClause) {
var (
c = &templateRenderCmd{}
renderCmd = cc.Command("render", "Render a given definition in a template file to standard output.")
)
renderCmd.Flag("template.glob", "Glob of paths that will be expanded and used for rendering.").Required().StringsVar(&c.templateFilesGlobs)
renderCmd.Flag("template.text", "The template that will be rendered.").Required().StringVar(&c.templateText)
renderCmd.Flag("template.type", "The type of the template. Can be either text (default) or html.").EnumVar(&c.templateType, "html", "text")
renderCmd.Flag("template.data", "Full path to a file which contains the data of the alert(-s) with which the --template.text will be rendered. Must be in JSON. File must be formatted according to the following layout: https://pkg.go.dev/github.com/prometheus/alertmanager/template#Data. If none has been specified then a predefined, simple alert will be used for rendering.").FileVar(&c.templateData)
renderCmd.Action(execWithTimeout(c.render))
}
func (c *templateRenderCmd) render(ctx context.Context, _ *kingpin.ParseContext) error {
tmpl, err := template.FromGlobs(c.templateFilesGlobs)
if err != nil {
return err
}
f := tmpl.ExecuteTextString
if c.templateType == "html" {
f = tmpl.ExecuteHTMLString
}
var data template.Data
if c.templateData == nil {
data = defaultData
} else {
content, err := io.ReadAll(c.templateData)
if err != nil {
return err
}
if err := json.Unmarshal(content, &data); err != nil {
return err
}
}
rendered, err := f(c.templateText, data)
if err != nil {
return err
}
fmt.Print(rendered)
return nil
}