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slack.go
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slack.go
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package slacknotifier
import (
"context"
"fmt"
"github.com/c9s/bbgo/pkg/types"
"time"
log "github.com/sirupsen/logrus"
"github.com/slack-go/slack"
)
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(token, channel string, options ...NotifyOption) *Notifier {
// var client = slack.New(token, slack.OptionDebug(true))
var client = slack.New(token)
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:
_, _, 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) NotifyTrade(trade *types.Trade) {
_, _, err := n.client.PostMessageContext(context.Background(), n.TradeChannel,
slack.MsgOptionText(util.Render(`:handshake: {{ .Symbol }} {{ .Side }} Trade Execution @ {{ .Price }}`, trade), true),
slack.MsgOptionAttachments(trade.SlackAttachment()))
if err != nil {
logrus.WithError(err).Error("slack send error")
}
}
*/
/*
func (n *Notifier) NotifyPnL(report *pnl.AverageCostPnlReport) {
attachment := report.SlackAttachment()
_, _, err := n.client.PostMessageContext(context.Background(), n.PnlChannel,
slack.MsgOptionText(util.Render(
`:heavy_dollar_sign: Here is your *{{ .symbol }}* PnL report collected since *{{ .startTime }}*`,
map[string]interface{}{
"symbol": report.Symbol,
"startTime": report.StartTime.Format(time.RFC822),
}), true),
slack.MsgOptionAttachments(attachment))
if err != nil {
logrus.WithError(err).Errorf("slack send error")
}
}
*/