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service.go
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service.go
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package telegram
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"path"
"sync/atomic"
"strings"
"github.com/influxdata/kapacitor/alert"
"github.com/influxdata/kapacitor/keyvalue"
"github.com/pkg/errors"
)
type Diagnostic interface {
WithContext(ctx ...keyvalue.T) Diagnostic
Error(msg string, err error)
}
type Service struct {
configValue atomic.Value
diag Diagnostic
}
func NewService(c Config, d Diagnostic) *Service {
s := &Service{
diag: d,
}
s.configValue.Store(c)
return s
}
func (s *Service) Open() error {
return nil
}
func (s *Service) Close() error {
return nil
}
func (s *Service) config() Config {
return s.configValue.Load().(Config)
}
func (s *Service) Update(newConfig []interface{}) error {
if l := len(newConfig); l != 1 {
return fmt.Errorf("expected only one new config object, got %d", l)
}
if c, ok := newConfig[0].(Config); !ok {
return fmt.Errorf("expected config object to be of type %T, got %T", c, newConfig[0])
} else {
s.configValue.Store(c)
}
return nil
}
func (s *Service) Global() bool {
c := s.config()
return c.Global
}
func (s *Service) StateChangesOnly() bool {
c := s.config()
return c.StateChangesOnly
}
type testOptions struct {
ChatId string `json:"chat-id"`
ParseMode string `json:"parse-mode"`
Message string `json:"message"`
DisableWebPagePreview bool `json:"disable-web-page-preview"`
DisableNotification bool `json:"disable-notification"`
}
func (s *Service) TestOptions() interface{} {
c := s.config()
return &testOptions{
ChatId: c.ChatId,
ParseMode: c.ParseMode,
Message: "test telegram message",
DisableWebPagePreview: c.DisableWebPagePreview,
DisableNotification: c.DisableNotification,
}
}
func (s *Service) Test(options interface{}) error {
o, ok := options.(*testOptions)
if !ok {
return fmt.Errorf("unexpected options type %T", options)
}
return s.Alert(
o.ChatId,
o.ParseMode,
o.Message,
o.DisableWebPagePreview,
o.DisableNotification,
)
}
func (s *Service) Alert(chatId, parseMode, message string, disableWebPagePreview, disableNotification bool) error {
url, post, err := s.preparePost(chatId, parseMode, message, disableWebPagePreview, disableNotification)
if err != nil {
return err
}
resp, err := http.Post(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 {
Description string `json:"description"`
ErrorCode int `json:"error_code"`
Ok bool `json:"ok"`
}
res := &response{}
err = json.Unmarshal(body, res)
if err != nil {
return fmt.Errorf("failed to understand Telegram response (err: %s). code: %d content: %s", err.Error(), resp.StatusCode, string(body))
}
return fmt.Errorf("sendMessage error (%d) description: %s", res.ErrorCode, res.Description)
}
return nil
}
func (s *Service) preparePost(chatId, parseMode, message string, disableWebPagePreview, disableNotification bool) (string, io.Reader, error) {
c := s.config()
if !c.Enabled {
return "", nil, errors.New("service is not enabled")
}
if chatId == "" {
chatId = c.ChatId
}
if parseMode == "" {
parseMode = c.ParseMode
}
if parseMode != "" && strings.ToLower(parseMode) != "markdown" && strings.ToLower(parseMode) != "html" {
return "", nil, fmt.Errorf("parseMode %s is not valid, please use 'Markdown' or 'HTML'", parseMode)
}
postData := make(map[string]interface{})
postData["chat_id"] = chatId
postData["text"] = message
if parseMode != "" {
postData["parse_mode"] = parseMode
}
if disableWebPagePreview || c.DisableWebPagePreview {
postData["disable_web_page_preview"] = true
}
if disableNotification || c.DisableNotification {
postData["disable_notification"] = true
}
var post bytes.Buffer
enc := json.NewEncoder(&post)
err := enc.Encode(postData)
if err != nil {
return "", nil, err
}
u, err := url.Parse(c.URL)
if err != nil {
return "", nil, errors.Wrap(err, "invalid URL")
}
u.Path = path.Join(u.Path+c.Token, "sendMessage")
return u.String(), &post, nil
}
type HandlerConfig struct {
// Telegram user/group ID to post messages to.
// If empty uses the chati-d from the configuration.
ChatId string `mapstructure:"chat-id"`
// Parse node, defaults to Mardown
// If empty uses the parse-mode from the configuration.
ParseMode string `mapstructure:"parse-mode"`
// Web Page preview
// If empty uses the disable-web-page-preview from the configuration.
DisableWebPagePreview bool `mapstructure:"disable-web-page-preview"`
// Disables Notification
// If empty uses the disable-notification from the configuration.
DisableNotification bool `mapstructure:"disable-notification"`
}
type handler struct {
s *Service
c HandlerConfig
diag Diagnostic
}
func (s *Service) Handler(c HandlerConfig, ctx ...keyvalue.T) alert.Handler {
return &handler{
s: s,
c: c,
diag: s.diag.WithContext(ctx...),
}
}
func (h *handler) Handle(event alert.Event) {
if err := h.s.Alert(
h.c.ChatId,
h.c.ParseMode,
event.State.Message,
h.c.DisableWebPagePreview,
h.c.DisableNotification,
); err != nil {
h.diag.Error("failed to send event to Telegram", err)
}
}