改进DNS域名解析相关函数

internal/utils/taskutils/concurrent.go

@@ -0,0 +1,61 @@
+// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package taskutils
+
+import (
+	"errors"
+	"reflect"
+	"sync"
+)
+
+const DefaultConcurrent = 16
+
+func RunConcurrent(tasks any, concurrent int, f func(task any, locker *sync.RWMutex)) error {
+	if tasks == nil {
+		return nil
+	}
+	var tasksValue = reflect.ValueOf(tasks)
+	if tasksValue.Type().Kind() != reflect.Slice {
+		return errors.New("ony works for slice")
+	}
+
+	var countTasks = tasksValue.Len()
+	if countTasks == 0 {
+		return nil
+	}
+
+	if concurrent <= 0 {
+		concurrent = 8
+	}
+	if concurrent > countTasks {
+		concurrent = countTasks
+	}
+
+	var taskChan = make(chan any, countTasks)
+	for i := 0; i < countTasks; i++ {
+		taskChan <- tasksValue.Index(i).Interface()
+	}
+
+	var wg = &sync.WaitGroup{}
+	wg.Add(concurrent)
+
+	var locker = &sync.RWMutex{}
+
+	for i := 0; i < concurrent; i++ {
+		go func() {
+			defer wg.Done()
+
+			for {
+				select {
+				case task := <-taskChan:
+					f(task, locker)
+				default:
+					return
+				}
+			}
+		}()
+	}
+	wg.Wait()
+
+	return nil
+}