/
webhook.go
88 lines (72 loc) · 1.76 KB
/
webhook.go
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/*
* Revision History:
* Initial: 2018/05/25 Li Zebang
*/
package slack
import (
"encoding/json"
"fmt"
"net/http"
"strconv"
"strings"
"time"
)
var httpClient = &http.Client{}
// Webhook contains required information
type Webhook struct {
url string
client *http.Client
}
// NewWebhook return a incoming webhook for sending data
// into Slack in real-time.
func NewWebhook(url string) *Webhook {
return &Webhook{
url: url,
client: httpClient,
}
}
// PostMessage send message to the specified channel.
// This channel is determined when you create a webhook.
func (w *Webhook) PostMessage(message string, labels ...string) error {
var text string
if labels == nil {
text = fmt.Sprintf("Message: %s", message)
} else {
text = fmt.Sprintf("Labels: %v\nMessage: %s", labels, message)
}
reqBody, err := json.Marshal(basicData{text})
if err != nil {
return err
}
req, err := http.NewRequest("POST", w.url, strings.NewReader(string(reqBody)))
if err != nil {
return err
}
defer req.Body.Close()
resp, err := w.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusTooManyRequests {
retry, err := strconv.ParseInt(resp.Header.Get("Retry-After"), 10, 64)
if err != nil {
return err
}
return &RateLimitedError{time.Duration(retry) * time.Second}
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("[firmness, slack, webhook] slack server error: %s", resp.Status)
}
return nil
}
type basicData struct {
Text string `json:"text"`
}
// RateLimitedError implements error interface
type RateLimitedError struct {
RetryAfter time.Duration
}
func (e *RateLimitedError) Error() string {
return fmt.Sprintf("Slack rate limit exceeded, retry after %s", e.RetryAfter)
}