refactor: introduce Pool interface, move agent_pool to agent module

internal/utils/pool/pool.go

@@ -0,0 +1,62 @@
+package pool
+
+import (
+	"sort"
+
+	"github.com/yusing/go-proxy/internal/utils"
+	"github.com/yusing/go-proxy/internal/utils/functional"
+)
+
+type (
+	Pool[T Object] struct {
+		m functional.Map[string, T]
+	}
+	Object interface {
+		Key() string
+		Name() string
+		utils.MapMarshaller
+	}
+)
+
+func New[T Object]() Pool[T] {
+	return Pool[T]{functional.NewMapOf[string, T]()}
+}
+
+func (p Pool[T]) Add(obj T) {
+	p.m.Store(obj.Key(), obj)
+}
+
+func (p Pool[T]) Get(key string) (T, bool) {
+	return p.m.Load(key)
+}
+
+func (p Pool[T]) Size() int {
+	return p.m.Size()
+}
+
+func (p Pool[T]) Clear() {
+	p.m.Clear()
+}
+
+func (p Pool[T]) Base() functional.Map[string, T] {
+	return p.m
+}
+
+func (p Pool[T]) Slice() []T {
+	slice := make([]T, 0, p.m.Size())
+	for _, v := range p.m.Range {
+		slice = append(slice, v)
+	}
+	sort.Slice(slice, func(i, j int) bool {
+		return slice[i].Name() < slice[j].Name()
+	})
+	return slice
+}
+
+func (p Pool[T]) Iter(fn func(k string, v T) bool) {
+	p.m.Range(fn)
+}
+
+func (p Pool[T]) IterAll(fn func(k string, v T)) {
+	p.m.RangeAll(fn)
+}