remove context in struct

common/interfaces.go

@@ -1,10 +1,23 @@
 package common
 
+// Closable is the interface for objects that can release its resources.
+type Closable interface {
+	// Close release all resources used by this object, including goroutines.
+	Close() error
+}
+
+// Close closes the obj if it is a Closable.
+func Close(obj interface{}) error {
+	if c, ok := obj.(Closable); ok {
+		return c.Close()
+	}
+	return nil
+}
+
 // Runnable is the interface for objects that can start to work and stop on demand.
 type Runnable interface {
 	// Start starts the runnable object. Upon the method returning nil, the object begins to function properly.
 	Start() error
 
-	// Close stops the object being working.
-	Close()
+	Closable
 }