go: Replace wait group with channel

GoBot/discord/discord.go

@@ -2,19 +2,14 @@ package discord
 
 import (
 	"fmt"
-	"os"
-	"os/signal"
 	"strings"
-	"sync"
-	"syscall"
 
 	"github.com/bwmarrin/discordgo"
 
 	"TerraOceanBot/discord/modules"
 )
 
-func StartBot(token string, wg *sync.WaitGroup) {
+func StartBot(token string, kill chan bool) {
-	defer wg.Done()
 	dg, err := discordgo.New("Bot " + strings.TrimSpace(token))
 	if err != nil {
 		panic(err)
@@ -32,10 +27,11 @@ func StartBot(token string, wg *sync.WaitGroup) {
 
 	fmt.Println("Bot is now running. Press CTRL-C to exit.")
 	go modules.ListenToVoteFinishes(dg)
-	sc := make(chan os.Signal, 1)
+
-	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
+	<-kill
-	<-sc
 
 	dg.Close()
 	fmt.Println("Discordgo exited successfully.")
+
+	<-kill
 }

GoBot/main.go

@@ -3,15 +3,26 @@ package main
 import (
 	"TerraOceanBot/server"
 	"io/ioutil"
-	"sync"
+	"os"
+	"os/signal"
+	"syscall"
 
 	"TerraOceanBot/discord"
 )
 
 func main() {
 	token, _ := ioutil.ReadFile("token.txt")
-	wg := sync.WaitGroup{}
+	endGracefully := make(chan bool)
-	go discord.StartBot(string(token), &wg)
+
-	server.StartServer(8080, &wg)
+	go discord.StartBot(string(token), endGracefully)
-	wg.Wait()
+	go server.StartServer(8080)
+
+	sc := make(chan os.Signal, 1)
+	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
+	<-sc
+
+	//Notification to end
+	endGracefully <- true
+	//Wait for it to actually end
+	endGracefully <- true
 }

GoBot/server/server.go

@@ -5,7 +5,6 @@ import (
 	"log"
 	"net/http"
 	"strconv"
-	"sync"
 
 	"github.com/gorilla/websocket"
 )
@@ -35,9 +34,7 @@ func newConnection(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func StartServer(port int, wg *sync.WaitGroup) {
+func StartServer(port int) {
-	defer wg.Done()
-
 	hostLocation := ":" + strconv.Itoa(port)
 	http.HandleFunc("/ws", newConnection)