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// Copyright 2018 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"
"errors"
"fmt"
"os/user"
"time"
"github.com/prometheus/client_golang/api"
"github.com/prometheus/common/model"
"gopkg.in/alecthomas/kingpin.v2"
"github.com/prometheus/alertmanager/client"
"github.com/prometheus/alertmanager/types"
)
func username() string {
user, err := user.Current()
if err != nil {
return ""
}
return user.Username
}
type silenceAddCmd struct {
author string
requireComment bool
duration string
start string
end string
comment string
matchers []string
}
const silenceAddHelp = `Add a new alertmanager silence
Amtool uses a simplified Prometheus syntax to represent silences. The
non-option section of arguments constructs a list of "Matcher Groups"
that will be used to create a number of silences. The following examples
will attempt to show this behaviour in action:
amtool silence add alertname=foo node=bar
This statement will add a silence that matches alerts with the
alertname=foo and node=bar label value pairs set.
amtool silence add foo node=bar
If alertname is omitted and the first argument does not contain a '=' or a
'=~' then it will be assumed to be the value of the alertname pair.
amtool silence add 'alertname=~foo.*'
As well as direct equality, regex matching is also supported. The '=~' syntax
(similar to Prometheus) is used to represent a regex match. Regex matching
can be used in combination with a direct match.
`
func configureSilenceAddCmd(cc *kingpin.CmdClause) {
var (
c = &silenceAddCmd{}
addCmd = cc.Command("add", silenceAddHelp)
)
addCmd.Flag("author", "Username for CreatedBy field").Short('a').StringVar(&c.author)
addCmd.Flag("require-comment", "Require comment to be set").Hidden().Default("true").BoolVar(&c.requireComment)
addCmd.Flag("duration", "Duration of silence").Short('d').Default("1h").StringVar(&c.duration)
addCmd.Flag("start", "Set when the silence should start. RFC3339 format 2006-01-02T15:04:05Z07:00").StringVar(&c.start)
addCmd.Flag("end", "Set when the silence should end (overwrites duration). RFC3339 format 2006-01-02T15:04:05Z07:00").StringVar(&c.end)
addCmd.Flag("comment", "A comment to help describe the silence").Short('c').StringVar(&c.comment)
addCmd.Arg("matcher-groups", "Query filter").StringsVar(&c.matchers)
addCmd.Action(c.add)
}
func (c *silenceAddCmd) add(ctx *kingpin.ParseContext) error {
var err error
matchers, err := parseMatchers(c.matchers)
if err != nil {
return err
}
if len(matchers) < 1 {
return fmt.Errorf("no matchers specified")
}
if c.author == "" {
c.author = username()
}
var endsAt time.Time
if c.end != "" {
endsAt, err = time.Parse(time.RFC3339, c.end)
if err != nil {
return err
}
} else {
d, err := model.ParseDuration(c.duration)
if err != nil {
return err
}
if d == 0 {
return fmt.Errorf("silence duration must be greater than 0")
}
endsAt = time.Now().UTC().Add(time.Duration(d))
}
if c.requireComment && c.comment == "" {
return errors.New("comment required by config")
}
var startsAt time.Time
if c.start != "" {
startsAt, err = time.Parse(time.RFC3339, c.start)
if err != nil {
return err
}
} else {
startsAt = time.Now().UTC()
}
if startsAt.After(endsAt) {
return errors.New("silence cannot start after it ends")
}
typeMatchers, err := TypeMatchers(matchers)
if err != nil {
return err
}
silence := types.Silence{
Matchers: typeMatchers,
StartsAt: startsAt,
EndsAt: endsAt,
CreatedBy: c.author,
Comment: c.comment,
}
apiClient, err := api.NewClient(api.Config{Address: alertmanagerURL.String()})
if err != nil {
return err
}
silenceAPI := client.NewSilenceAPI(apiClient)
silenceID, err := silenceAPI.Set(context.Background(), silence)
if err != nil {
return err
}
_, err = fmt.Println(silenceID)
return err
}
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