use custom http client for slack messages

extras/util/slack.go

@@ -2,7 +2,10 @@ package util
 
 import (
 	"fmt"
+	"net"
+	"net/http"
 	"strings"
+	"time"
 
 	"github.com/lbryio/lbry.go/v2/extras/errors"
 
@@ -61,6 +64,18 @@ func SendToSlack(format string, a ...interface{}) error {
 func sendToSlack(channel, username, message string) error {
 	var err error
 
+	c := &http.Client{
+		Transport: &http.Transport{
+			DialContext: (&net.Dialer{
+				Timeout:   30 * time.Second,
+				KeepAlive: 30 * time.Second,
+			}).DialContext,
+			TLSHandshakeTimeout:   10 * time.Second,
+			ResponseHeaderTimeout: 10 * time.Second,
+			ExpectContinueTimeout: 1 * time.Second,
+		},
+	}
+	slack.OptionHTTPClient(c)
 	if slackApi == nil {
 		err = errors.Err("no slack token provided")
 	} else {