Added Chronos to schedule tasks, restructured config as common pkg, updated server pkg

src/common/app.go

@@ -0,0 +1,64 @@
+package common
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+type (
+	Doer interface {
+		Start() error
+		RegisterHandler(string, func() any)
+		OnShutdown()
+	}
+	Application interface {
+		Start(while chan struct{})
+		RegisterPlugin(PluginFn) error
+		Shutdown()
+	}
+
+	App struct {
+		doer Doer
+	}
+)
+
+func NewApp(d Doer) *App {
+	return &App{
+		doer: d,
+	}
+}
+
+func (a *App) Start(while chan struct{}) error {
+	go func() {
+		sigint := make(chan os.Signal, 1)
+		signal.Notify(sigint, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
+		<-sigint
+		fmt.Println("Received signal:", sigint)
+
+		a.Shutdown()
+
+		close(while)
+	}()
+
+	err := a.doer.Start()
+	if err != nil {
+		log.Fatalf("Failed to start app. Reason: %v\n", err)
+		close(while)
+	}
+	<-while
+
+	return err
+}
+
+func (a *App) RegisterPlugin(p Plugin) error {
+	a.doer.RegisterHandler(p.name, p.fn)
+
+	return nil
+}
+
+func (a *App) Shutdown() {
+	a.doer.OnShutdown()
+}