aliyunpan/internal/file/downloader/config.go

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// 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
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//
// 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
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MinParallelSize int64 = 10 * 1024 * 1024 // 10MB
// MaxParallelWorkerCount 单个文件下载最大并发线程数量
// 阿里云盘规定并发下载线程数不要超过10否则会有风控检测处罚的风险
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MaxParallelWorkerCount int = 3
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)
// Config 下载配置
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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
ExcludeNames []string // 排除的文件名,包括文件夹和文件。即这些文件/文件夹不进行下载,支持正则表达式
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}
// NewConfig 返回默认配置
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func NewConfig() *Config {
return &Config{
MaxParallel: 5,
CacheSize: CacheSize,
}
}
// Fix 修复配置信息, 使其合法
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func (cfg *Config) Fix() {
fixCacheSize(&cfg.CacheSize)
if cfg.MaxParallel < 1 {
cfg.MaxParallel = 1
}
}
// Copy 拷贝新的配置
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func (cfg *Config) Copy() *Config {
newCfg := *cfg
return &newCfg
}