add base queue system

workers/workers.go

@@ -0,0 +1,39 @@
+package workers
+
+import (
+	"context"
+	"encoding/json"
+	"log"
+
+	"github.com/hibiken/asynq"
+)
+
+// A list of task types.
+const (
+	TypeWelcomeEmail  = "email:welcome"
+	TypeReminderEmail = "email:reminder"
+)
+
+// Task payload for any email related tasks.
+type EmailTaskPayload struct {
+	// ID for the email recipient.
+	UserID int
+}
+
+func HandleWelcomeEmailTask(ctx context.Context, t *asynq.Task) error {
+	var p EmailTaskPayload
+	if err := json.Unmarshal(t.Payload(), &p); err != nil {
+		return err
+	}
+	log.Printf(" [*] Send Welcome Email to User %d", p.UserID)
+	return nil
+}
+
+func HandleReminderEmailTask(ctx context.Context, t *asynq.Task) error {
+	var p EmailTaskPayload
+	if err := json.Unmarshal(t.Payload(), &p); err != nil {
+		return err
+	}
+	log.Printf(" [*] Send Reminder Email to User %d", p.UserID)
+	return nil
+}