feat(munch): setup signal handler

This commit adds a signal handler which detects Ctrl+Cs and then
properly shuts down all of Munch. Before, only one of Munch's Goroutines
would be shut down to the full leaving a dangling Goroutine, in this
case; the Worlds bot.

Author: Fuwn

munch.go

@@ -7,12 +7,14 @@ import (
 	"github.com/Whirlsplash/munch/pkg/config"
 	"github.com/Whirlsplash/munch/pkg/discord"
 	"github.com/Whirlsplash/munch/pkg/server"
+	"github.com/Whirlsplash/munch/pkg/utilities"
 	"github.com/spf13/viper"
 	"sync"
 )
 
 func main() {
 	config.Setup()
+	utilities.SetupSignalHandler()
 
 	var wg sync.WaitGroup
 

pkg/utilities/signal.go

@@ -0,0 +1,25 @@
+// Copyright (C) 2021-2021 The Whirlsplash Collective
+// SPDX-License-Identifier: GPL-3.0-only
+
+package utilities
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func SetupSignalHandler() {
+	c := make(chan os.Signal)
+
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		<-c
+
+		log.Println("Killing Munch with SignalHandler")
+
+		os.Exit(1)
+	}()
+}