feat: tun support auto-redirect, route-address-set and route-exclude-address-set

common/utils/callback.go

@@ -0,0 +1,50 @@
+package utils
+
+import (
+	"io"
+	"sync"
+
+	list "github.com/bahlo/generic-list-go"
+)
+
+type Callback[T any] struct {
+	list  list.List[func(T)]
+	mutex sync.RWMutex
+}
+
+func NewCallback[T any]() *Callback[T] {
+	return &Callback[T]{}
+}
+
+func (c *Callback[T]) Register(item func(T)) io.Closer {
+	c.mutex.RLock()
+	defer c.mutex.RUnlock()
+	element := c.list.PushBack(item)
+	return &callbackCloser[T]{
+		element:  element,
+		callback: c,
+	}
+}
+
+func (c *Callback[T]) Emit(item T) {
+	c.mutex.RLock()
+	defer c.mutex.RUnlock()
+	for element := c.list.Front(); element != nil; element = element.Next() {
+		go element.Value(item)
+	}
+}
+
+type callbackCloser[T any] struct {
+	element  *list.Element[func(T)]
+	callback *Callback[T]
+	once     sync.Once
+}
+
+func (c *callbackCloser[T]) Close() error {
+	c.once.Do(func() {
+		c.callback.mutex.Lock()
+		defer c.callback.mutex.Unlock()
+		c.callback.list.Remove(c.element)
+	})
+	return nil
+}