bbgo_origin/pkg/notifier/slacknotifier/slack.go
2022-09-12 00:17:00 +08:00

161 lines
3.4 KiB
Go

package slacknotifier
import (
"bytes"
"context"
"fmt"
"time"
"golang.org/x/time/rate"
"github.com/c9s/bbgo/pkg/types"
log "github.com/sirupsen/logrus"
"github.com/slack-go/slack"
)
var limiter = rate.NewLimiter(rate.Every(1*time.Second), 1)
type notifyTask struct {
Channel string
Opts []slack.MsgOption
}
type slackAttachmentCreator interface {
SlackAttachment() slack.Attachment
}
type Notifier struct {
client *slack.Client
channel string
taskC chan notifyTask
}
type NotifyOption func(notifier *Notifier)
func New(client *slack.Client, channel string, options ...NotifyOption) *Notifier {
notifier := &Notifier{
channel: channel,
client: client,
taskC: make(chan notifyTask, 100),
}
for _, o := range options {
o(notifier)
}
go notifier.worker()
return notifier
}
func (n *Notifier) worker() {
ctx := context.Background()
for {
select {
case <-ctx.Done():
return
case task := <-n.taskC:
limiter.Wait(ctx)
_, _, err := n.client.PostMessageContext(ctx, task.Channel, task.Opts...)
if err != nil {
log.WithError(err).
WithField("channel", task.Channel).
Errorf("slack api error: %s", err.Error())
}
}
}
}
func (n *Notifier) Notify(obj interface{}, args ...interface{}) {
n.NotifyTo(n.channel, obj, args...)
}
func filterSlackAttachments(args []interface{}) (slackAttachments []slack.Attachment, pureArgs []interface{}) {
var firstAttachmentOffset = -1
for idx, arg := range args {
switch a := arg.(type) {
// concrete type assert first
case slack.Attachment:
if firstAttachmentOffset == -1 {
firstAttachmentOffset = idx
}
slackAttachments = append(slackAttachments, a)
case slackAttachmentCreator:
if firstAttachmentOffset == -1 {
firstAttachmentOffset = idx
}
slackAttachments = append(slackAttachments, a.SlackAttachment())
case types.PlainText:
if firstAttachmentOffset == -1 {
firstAttachmentOffset = idx
}
// fallback to PlainText if it's not supported
// convert plain text to slack attachment
text := a.PlainText()
slackAttachments = append(slackAttachments, slack.Attachment{
Title: text,
})
}
}
pureArgs = args
if firstAttachmentOffset > -1 {
pureArgs = args[:firstAttachmentOffset]
}
return slackAttachments, pureArgs
}
func (n *Notifier) NotifyTo(channel string, obj interface{}, args ...interface{}) {
if len(channel) == 0 {
channel = n.channel
}
slackAttachments, pureArgs := filterSlackAttachments(args)
var opts []slack.MsgOption
switch a := obj.(type) {
case string:
opts = append(opts, slack.MsgOptionText(fmt.Sprintf(a, pureArgs...), true),
slack.MsgOptionAttachments(slackAttachments...))
case slack.Attachment:
opts = append(opts, slack.MsgOptionAttachments(append([]slack.Attachment{a}, slackAttachments...)...))
case slackAttachmentCreator:
// convert object to slack attachment (if supported)
opts = append(opts, slack.MsgOptionAttachments(append([]slack.Attachment{a.SlackAttachment()}, slackAttachments...)...))
default:
log.Errorf("slack message conversion error, unsupported object: %T %+v", a, a)
}
select {
case n.taskC <- notifyTask{
Channel: channel,
Opts: opts,
}:
case <-time.After(50 * time.Millisecond):
return
}
}
func (n *Notifier) SendPhoto(buffer *bytes.Buffer) {
n.SendPhotoTo(n.channel, buffer)
}
func (n *Notifier) SendPhotoTo(channel string, buffer *bytes.Buffer) {
// TODO
}