refactor: pass api_url through context (#457)

* refactor: pass `api_url` through context

* 移除 LinkArgs.HttpReq

* pref(alias): 减少不必要下载代理

* 修复bug

* net: 支持1并发 分片下载

internal/task/base.go

@@ -2,7 +2,6 @@ package task
 
 import (
 	"context"
-	"sync"
 	"time"
 
 	"github.com/OpenListTeam/OpenList/internal/conf"
@@ -12,12 +11,21 @@ import (
 
 type TaskExtension struct {
 	tache.Base
-	ctx          context.Context
-	ctxInitMutex sync.Mutex
-	Creator      *model.User
-	startTime    *time.Time
-	endTime      *time.Time
-	totalBytes   int64
+	Creator    *model.User
+	startTime  *time.Time
+	endTime    *time.Time
+	totalBytes int64
+	ApiUrl     string
+}
+
+func (t *TaskExtension) SetCtx(ctx context.Context) {
+	if t.Creator != nil {
+		ctx = context.WithValue(ctx, "user", t.Creator)
+	}
+	if len(t.ApiUrl) > 0 {
+		ctx = context.WithValue(ctx, conf.ApiUrlKey, t.ApiUrl)
+	}
+	t.Base.SetCtx(ctx)
 }
 
 func (t *TaskExtension) SetCreator(creator *model.User) {
@@ -57,29 +65,18 @@ func (t *TaskExtension) GetTotalBytes() int64 {
 	return t.totalBytes
 }
 
-func (t *TaskExtension) Ctx() context.Context {
-	if t.ctx == nil {
-		t.ctxInitMutex.Lock()
-		if t.ctx == nil {
-			t.ctx = context.WithValue(t.Base.Ctx(), "user", t.Creator)
-		}
-		t.ctxInitMutex.Unlock()
-	}
-	return t.ctx
-}
-
-func (t *TaskExtension) ReinitCtx() {
-	if !conf.Conf.Tasks.AllowRetryCanceled {
-		return
-	}
+func (t *TaskExtension) ReinitCtx() error {
 	select {
-	case <-t.Base.Ctx().Done():
+	case <-t.Ctx().Done():
+		if !conf.Conf.Tasks.AllowRetryCanceled {
+			return t.Ctx().Err()
+		}
 		ctx, cancel := context.WithCancel(context.Background())
 		t.SetCtx(ctx)
 		t.SetCancelFunc(cancel)
-		t.ctx = nil
 	default:
 	}
+	return nil
 }
 
 type TaskExtensionInfo interface {