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silence_add.go
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silence_add.go
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package cli
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
"os/user"
"time"
"github.com/alecthomas/kingpin"
"github.com/prometheus/alertmanager/types"
"github.com/prometheus/common/model"
)
type addResponse struct {
Status string `json:"status"`
Data struct {
SilenceID string `json:"silenceId"`
} `json:"data,omitempty"`
ErrorType string `json:"errorType,omitempty"`
Error string `json:"error,omitempty"`
}
func username() string {
user, err := user.Current()
if err != nil {
return ""
}
return user.Username
}
var (
addCmd = silenceCmd.Command("add", "Add a new alertmanager silence")
author = addCmd.Flag("author", "Username for CreatedBy field").Short('a').Default(username()).String()
requireComment = addCmd.Flag("require-comment", "Require comment to be set").Hidden().Default("true").Bool()
expires = addCmd.Flag("expires", "Duration of silence").Short('e').Default("1h").String()
expireOn = addCmd.Flag("expire-on", "Expire at a certain time (Overwrites expires) RFC3339 format 2006-01-02T15:04:05Z07:00").String()
comment = addCmd.Flag("comment", "A comment to help describe the silence").Short('c').String()
addArgs = addCmd.Arg("matcher-groups", "Query filter").Strings()
)
func init() {
addCmd.Action(add)
longHelpText["silence add"] = `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 ommited 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 add(element *kingpin.ParseElement, ctx *kingpin.ParseContext) error {
var err error
matchers, err := parseMatchers(*addArgs)
if err != nil {
return err
}
if len(matchers) < 1 {
return fmt.Errorf("no matchers specified")
}
var endsAt time.Time
if *expireOn != "" {
endsAt, err = time.Parse(time.RFC3339, *expireOn)
if err != nil {
return err
}
} else {
duration, err := model.ParseDuration(*expires)
if err != nil {
return err
}
if duration == 0 {
return fmt.Errorf("silence duration must be greater than 0")
}
endsAt = time.Now().UTC().Add(time.Duration(duration))
}
if *requireComment && *comment == "" {
return errors.New("comment required by config")
}
typeMatchers, err := TypeMatchers(matchers)
if err != nil {
return err
}
silence := types.Silence{
Matchers: typeMatchers,
StartsAt: time.Now().UTC(),
EndsAt: endsAt,
CreatedBy: *author,
Comment: *comment,
}
silenceId, err := addSilence(&silence)
if err != nil {
return err
}
_, err = fmt.Println(silenceId)
return err
}
func addSilence(silence *types.Silence) (string, error) {
u := GetAlertmanagerURL("/api/v1/silences")
buf := bytes.NewBuffer([]byte{})
err := json.NewEncoder(buf).Encode(silence)
if err != nil {
return "", err
}
res, err := http.Post(u.String(), "application/json", buf)
if err != nil {
return "", err
}
defer res.Body.Close()
response := addResponse{}
err = json.NewDecoder(res.Body).Decode(&response)
if err != nil {
return "", fmt.Errorf("unable to parse silence json response from %s", u.String())
}
if response.Status == "error" {
return "", fmt.Errorf("[%s] %s", response.ErrorType, response.Error)
}
return response.Data.SilenceID, nil
}