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service.go
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service.go
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package slack
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"github.com/influxdata/kapacitor"
)
type Service struct {
channel string
url string
global bool
stateChangesOnly bool
logger *log.Logger
}
func NewService(c Config, l *log.Logger) *Service {
return &Service{
channel: c.Channel,
url: c.URL,
global: c.Global,
stateChangesOnly: c.StateChangesOnly,
logger: l,
}
}
func (s *Service) Open() error {
return nil
}
func (s *Service) Close() error {
return nil
}
func (s *Service) Global() bool {
return s.global
}
func (s *Service) StateChangesOnly() bool {
return s.stateChangesOnly
}
// slack attachment info
type attachment struct {
Fallback string `json:"fallback"`
Color string `json:"color"`
Text string `json:"text"`
}
func (s *Service) Alert(channel, message string, level kapacitor.AlertLevel) error {
if channel == "" {
channel = s.channel
}
var color string
switch level {
case kapacitor.WarnAlert:
color = "warning"
case kapacitor.CritAlert:
color = "danger"
default:
color = "good"
}
a := attachment{
Fallback: message,
Text: message,
Color: color,
}
postData := make(map[string]interface{})
postData["channel"] = channel
postData["username"] = kapacitor.Product
postData["text"] = ""
postData["attachments"] = []attachment{a}
var post bytes.Buffer
enc := json.NewEncoder(&post)
err := enc.Encode(postData)
if err != nil {
return err
}
resp, err := http.Post(s.url, "application/json", &post)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
type response struct {
Error string `json:"error"`
}
r := &response{Error: fmt.Sprintf("failed to understand Slack response. code: %d content: %s", resp.StatusCode, string(body))}
b := bytes.NewReader(body)
dec := json.NewDecoder(b)
dec.Decode(r)
return errors.New(r.Error)
}
return nil
}