restrict the upload/download parallel number to fix issue #67

internal/command/download.go

@@ -149,7 +149,7 @@ func CmdDownload() cli.Command {
 			},
 			cli.IntFlag{
 				Name:  "p",
-				Usage: "指定同时进行下载文件的数量",
+				Usage: "指定同时进行下载文件的数量（取值范围:1 ~ 20）",
 			},
 			cli.IntFlag{
 				Name:  "retry",
@@ -227,6 +227,9 @@ func RunDownload(paths []string, options *DownloadOptions) {
 			options.Parallel = config.DefaultFileDownloadParallelNum
 		}
 	}
+	if options.Parallel > config.MaxFileDownloadParallelNum {
+		options.Parallel = config.MaxFileDownloadParallelNum
+	}
 
 	paths, err := matchPathByShellPattern(options.DriveId, paths...)
 	if err != nil {

internal/command/upload.go

@@ -70,7 +70,7 @@ type (
 var UploadFlags = []cli.Flag{
 	cli.IntFlag{
 		Name:  "p",
-		Usage: "本次操作文件上传并发数量，即可以同时并发上传多少个文件。0代表跟从配置文件设置",
+		Usage: "本次操作文件上传并发数量，即可以同时并发上传多少个文件。0代表跟从配置文件设置（取值范围:1 ~ 20）",
 		Value: 0,
 	},
 	cli.IntFlag{
@@ -253,6 +253,10 @@ func RunUpload(localPaths []string, savePath string, opt *UploadOptions) {
 			opt.AllParallel = config.DefaultFileUploadParallelNum
 		}
 	}
+	if opt.AllParallel > config.MaxFileUploadParallelNum {
+		opt.AllParallel = config.MaxFileUploadParallelNum
+	}
+
 	if opt.Parallel <= 0 {
 		opt.Parallel = 1
 	}

internal/config/pan_config.go

@@ -42,9 +42,15 @@ const (
 	// DefaultFileUploadParallelNum 默认的文件上传并发数量
 	DefaultFileUploadParallelNum = 10
 
+	// MaxFileUploadParallelNum 最大文件上传并发数量。过大会被阿里云盘风控，导致无法上传
+	MaxFileUploadParallelNum = 20
+
 	// DefaultFileDownloadParallelNum 默认的文件下载并发数量
 	DefaultFileDownloadParallelNum = 5
 
+	// MaxFileDownloadParallelNum 最大文件下载并发数量。过大会被阿里云盘风控，导致无法下载
+	MaxFileDownloadParallelNum = 20
+
 	// DefaultTokenServiceWebHost 默认的token服务
 	DefaultTokenServiceWebHost = "https://api.tickstep.com"
 	//DefaultTokenServiceWebHost = "http://localhost:8977"