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slack.go
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slack.go
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package nopaste
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"math"
"net/http"
"net/url"
"time"
)
const SlackMaxBackOff = 3600
var (
SlackThrottleWindow = 1 * time.Second
SlackInitialBackOff = 30
Epoch = time.Unix(0, 0)
)
type SlackMessage struct {
Channel string `json:"channel"`
Text string `json:"text"`
IconEmoji string `json:"icon_emoji,omitempty"`
IconURL string `json:"icon_url,omitempty"`
Username string `json:"username"`
LinkNames int `json:"link_names,omitempty"`
}
type SlackMessageChan chan SlackMessage
func (ch SlackMessageChan) PostNopaste(np nopasteContent, url string) {
summary := np.Summary
nick := np.Nick
var text string
if summary == "" {
text = fmt.Sprintf("<%s|%s>", url, url)
} else {
text = fmt.Sprintf("%s <%s|show details>", summary, url)
}
msg := SlackMessage{
Channel: np.Channel,
Username: nick,
Text: text,
IconEmoji: np.IconEmoji,
IconURL: np.IconURL,
LinkNames: np.LinkNames,
}
select {
case ch <- msg:
default:
log.Println("[warn] Can't send msg to Slack")
}
}
func (ch SlackMessageChan) PostMsgr(req *http.Request) {
username := req.FormValue("username")
if username == "" {
username = "msgr"
}
msg := SlackMessage{
Channel: req.FormValue("channel"),
Text: req.FormValue("msg"),
Username: username,
IconEmoji: req.FormValue("icon_emoji"),
IconURL: req.FormValue("icon_url"),
LinkNames: 0, // default notice as IRC
}
if _notice := req.FormValue("notice"); _notice == "0" {
msg.LinkNames = 1
}
select {
case ch <- msg:
default:
log.Println("[warn] Can't send msg to Slack")
}
}
type SlackAgent struct {
WebhookURL string
client *http.Client
}
func (a *SlackAgent) Post(m SlackMessage) error {
payload, _ := json.Marshal(&m)
v := url.Values{}
v.Set("payload", string(payload))
log.Println("[debug] post to slack", a, string(payload))
resp, err := a.client.PostForm(a.WebhookURL, v)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusOK {
return nil
}
if body, err := ioutil.ReadAll(resp.Body); err == nil {
return fmt.Errorf("failed post to slack:%s", body)
} else {
return err
}
}
func RunSlackAgent(c *Config, ch chan SlackMessage) {
log.Println("[info] runing slack agent")
joined := make(map[string]chan SlackMessage)
agent := &SlackAgent{
WebhookURL: c.Slack.WebhookURL,
client: &http.Client{},
}
for {
select {
case msg := <-ch:
if _, ok := joined[msg.Channel]; !ok {
joined[msg.Channel] = make(chan SlackMessage, MsgBufferLen)
go sendMsgToSlackChannel(agent, joined[msg.Channel])
}
select {
case joined[msg.Channel] <- msg:
default:
log.Println("[warn] Can't send msg to Slack. Channel buffer flooding.")
}
}
}
}
func sendMsgToSlackChannel(agent *SlackAgent, ch chan SlackMessage) {
lastPostedAt := time.Now()
ignoreUntil := Epoch
backoff := SlackInitialBackOff
for {
select {
case msg := <-ch:
if time.Now().Before(ignoreUntil) {
// ignored
continue
}
throttle(lastPostedAt, SlackThrottleWindow)
err := agent.Post(msg)
lastPostedAt = time.Now()
if err != nil {
backoff = int(math.Min(float64(backoff)*2, SlackMaxBackOff))
d, _ := time.ParseDuration(fmt.Sprintf("%ds", backoff))
ignoreUntil = lastPostedAt.Add(d)
log.Println("[warn]", err, msg.Channel, "will be ignored until", ignoreUntil)
} else if !ignoreUntil.Equal(Epoch) {
ignoreUntil = Epoch
backoff = SlackInitialBackOff
}
}
}
}