init project

internal/file/downloader/config.go

@@ -0,0 +1,63 @@
+// Copyright (c) 2020 tickstep.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package downloader
+
+import (
+	"github.com/tickstep/aliyunpan/library/requester/transfer"
+)
+
+const (
+	//CacheSize 默认的下载缓存
+	CacheSize = 8192
+)
+
+var (
+	// MinParallelSize 单个线程最小的数据量
+	MinParallelSize int64 = 128 * 1024 // 128kb
+)
+
+//Config 下载配置
+type Config struct {
+	Mode                       transfer.RangeGenMode      // 下载Range分配模式
+	MaxParallel                int                        // 最大下载并发量
+	CacheSize                  int                        // 下载缓冲
+	BlockSize                  int64                      // 每个Range区块的大小, RangeGenMode 为 RangeGenMode2 时才有效
+	MaxRate                    int64                      // 限制最大下载速度
+	InstanceStateStorageFormat InstanceStateStorageFormat // 断点续传储存类型
+	InstanceStatePath          string                     // 断点续传信息路径
+	TryHTTP                    bool                       // 是否尝试使用 http 连接
+	ShowProgress               bool                       // 是否展示下载进度条
+}
+
+//NewConfig 返回默认配置
+func NewConfig() *Config {
+	return &Config{
+		MaxParallel: 5,
+		CacheSize:   CacheSize,
+	}
+}
+
+//Fix 修复配置信息, 使其合法
+func (cfg *Config) Fix() {
+	fixCacheSize(&cfg.CacheSize)
+	if cfg.MaxParallel < 1 {
+		cfg.MaxParallel = 1
+	}
+}
+
+//Copy 拷贝新的配置
+func (cfg *Config) Copy() *Config {
+	newCfg := *cfg
+	return &newCfg
+}