fix: ffi instance be singleton

bind/common.go

@@ -5,51 +5,24 @@ import (
 	"errors"
 	"github.com/GopeedLab/gopeed/pkg/api"
 	"github.com/GopeedLab/gopeed/pkg/api/model"
-	"sync"
 )
 
-type instanceArray struct {
-	mu    sync.RWMutex
-	array []*api.Instance
-}
+// Global singleton instance
+var instance *api.Instance
 
-// append appends an instance to the array.
-// Returns the index of the instance in the array.
-func (ia *instanceArray) append(instance *api.Instance) int {
-	ia.mu.Lock()
-	defer ia.mu.Unlock()
-
-	ia.array = append(ia.array, instance)
-	return len(ia.array) - 1
-}
-
-func (ia *instanceArray) get(index int) (*api.Instance, bool) {
-	ia.mu.RLock()
-	defer ia.mu.RUnlock()
-	if index < 0 || index >= len(ia.array) {
-		return nil, false
+func Init(config *model.StartConfig) (err error) {
+	if instance != nil {
+		return nil
 	}
-	return ia.array[index], true
-}
 
-var instances = &instanceArray{
-	mu:    sync.RWMutex{},
-	array: make([]*api.Instance, 0),
-}
-
-func Create(config *model.StartConfig) string {
 	config.ProductionMode = true
-	instance, err := api.Create(config)
-	if err != nil {
-		return BuildResult(err)
-	}
-	return BuildResult(instances.append(instance))
+	instance, err = api.Create(config)
+	return
 }
 
-func Invoke(index int, request *api.Request) string {
-	instance, ok := instances.get(index)
-	if !ok {
-		return BuildResult(errors.New("instance not found"))
+func Invoke(request *api.Request) string {
+	if instance == nil {
+		return BuildResult(errors.New("instance not initialized"))
 	}
 	return jsonEncode(api.Invoke(instance, request))
 }