[TASK] add worker

worker/main.go

@@ -0,0 +1,41 @@
+// Package with a lib for cronjobs to run in background
+package worker
+
+import "time"
+
+// Struct which handles the job
+type Worker struct {
+	every time.Duration
+	run   func()
+	quit  chan struct{}
+}
+
+// Function to create a new Worker with a timestamp, run, every and it's function
+func NewWorker(every time.Duration, f func()) (w *Worker) {
+	w = &Worker{
+		every: every,
+		run:   f,
+		quit:  make(chan struct{}),
+	}
+	return
+}
+
+// Function to start the Worker
+// (please us it as a go routine with go w.Start())
+func (w *Worker) Start() {
+	ticker := time.NewTicker(w.every)
+	for {
+		select {
+		case <-ticker.C:
+			w.run()
+		case <-w.quit:
+			ticker.Stop()
+			return
+		}
+	}
+}
+
+// Function to stop the Worker
+func (w *Worker) Close() {
+	close(w.quit)
+}

worker/main_test.go

@@ -0,0 +1,26 @@
+// Package with a lib for cronjobs to run in background
+package worker
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// Function to test the Worker
+func TestWorker(t *testing.T) {
+	assert := assert.New(t)
+
+	runtime := 0
+
+	w := NewWorker(time.Duration(5)*time.Millisecond, func() {
+		runtime = runtime + 1
+	})
+	go w.Start()
+	time.Sleep(time.Duration(18) * time.Millisecond)
+	w.Close()
+
+	assert.Equal(3, runtime)
+	time.Sleep(time.Duration(8) * time.Millisecond)
+}