downloader

package
v0.3.1 Latest Latest
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 Go to latest Published: Apr 21, 2024 License: Apache-2.0 Imports: 33 Imported by: 0

Documentation

Overview

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Index

Constants

View Source 
const (
	// InstanceStateStorageFormatJSON json 格式
	InstanceStateStorageFormatJSON = iota
	// InstanceStateStorageFormatProto3 protobuf 格式
	InstanceStateStorageFormatProto3
)
View Source 
const (
	//CacheSize 默认的下载缓存
	CacheSize = 8192
)
View Source 
const (
	// DefaultAcceptRanges 默认的 Accept-Ranges
	DefaultAcceptRanges = "bytes"
)

Variables

View Source 
var (
	// MinParallelSize 单个线程最小的数据量
	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
	MaxParallelWorkerCount int = 3
)
View Source 
var (
	// ContentRangeRE Content-Range 正则
	ContentRangeRE = regexp.MustCompile(`^.*? \d*?-\d*?/(\d*?)$`)

	// 文件被禁止下载
	ErrFileDownloadForbidden = errors.New("文件被禁止下载")
)
View Source 
var (
	//ErrNoWokers no workers
	ErrNoWokers = errors.New("no workers")
)

Functions

func DefaultDURLCheckFunc 

func DefaultDURLCheckFunc(client *requester.HTTPClient, durl string) (contentLength int64, resp *http.Response, err error)

DefaultDURLCheckFunc 默认的 DURLCheckFunc

func DefaultLoadBalancerCompareFunc 

func DefaultLoadBalancerCompareFunc(info map[string]string, subResp *http.Response) bool

DefaultLoadBalancerCompareFunc 检测负载均衡的服务器是否一致

func GetFileName 

func GetFileName(uri string, client *requester.HTTPClient) (filename string, err error)

GetFileName 获取文件名

func GetStatusText 

func GetStatusText(sc StatusCode) string

GetStatusText 根据状态码获取状态信息

func IsUrlExpired added in v0.3.0 

func IsUrlExpired(urlStr string) bool

IsUrlExpired 下载链接是否已过期。过期返回True

func ParseContentRange 

func ParseContentRange(contentRange string) (contentLength int64)

ParseContentRange 解析Content-Range

func RandomNumber 

func RandomNumber(min, max int) int

RandomNumber 生成指定区间随机数

Types

type ByLeftDesc 

type ByLeftDesc struct {
	WorkerList
}

ByLeftDesc 根据剩余下载量倒序排序

func (ByLeftDesc) Less 

func (wl ByLeftDesc) Less(i, j int) bool

Less 实现倒序

type Config 

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
}

Config 下载配置

func NewConfig 

func NewConfig() *Config

NewConfig 返回默认配置

func (*Config) Copy 

func (cfg *Config) Copy() *Config

Copy 拷贝新的配置

func (*Config) Fix 

func (cfg *Config) Fix()

Fix 修复配置信息, 使其合法

type DURLCheckFunc 

type DURLCheckFunc func(client *requester.HTTPClient, durl string) (contentLength int64, resp *http.Response, err error)

DURLCheckFunc 下载URL检测函数

type DownloadStatusFunc 

type DownloadStatusFunc func(status transfer.DownloadStatuser, workersCallback func(RangeWorkerFunc))

DownloadStatusFunc 下载状态处理函数

type Downloader 

type Downloader struct {
	// contains filtered or unexported fields
}

Downloader 下载

func NewDownloader 

func NewDownloader(writer io.WriterAt, config *Config, p *config.PanClient, globalSpeedsStat *speeds.Speeds) (der *Downloader)

NewDownloader 初始化Downloader

func (*Downloader) AddLoadBalanceServer 

func (der *Downloader) AddLoadBalanceServer(urls ...string)

AddLoadBalanceServer 增加负载均衡服务器

func (*Downloader) Cancel 

func (der *Downloader) Cancel()

Cancel 取消

func (*Downloader) Execute 

func (der *Downloader) Execute() error

Execute 开始任务

func (*Downloader) Failed added in v0.1.1 

func (der *Downloader) Failed()

Failed 失败

func (*Downloader) OnCancel 

func (der *Downloader) OnCancel(onCancelEvent requester.Event)

OnCancel 设置取消下载事件

func (*Downloader) OnDownloadStatusEvent 

func (der *Downloader) OnDownloadStatusEvent(f DownloadStatusFunc)

OnDownloadStatusEvent 设置状态处理函数

func (*Downloader) OnExecute 

func (der *Downloader) OnExecute(onExecuteEvent requester.Event)

OnExecute 设置开始下载事件

func (*Downloader) OnFailed added in v0.1.1 

func (der *Downloader) OnFailed(onFailedEvent requester.Event)

OnFailed 设置失败事件

func (*Downloader) OnFinish 

func (der *Downloader) OnFinish(onFinishEvent requester.Event)

OnFinish 设置结束下载事件

func (*Downloader) OnPause 

func (der *Downloader) OnPause(onPauseEvent requester.Event)

OnPause 设置暂停下载事件

func (*Downloader) OnResume 

func (der *Downloader) OnResume(onResumeEvent requester.Event)

OnResume 设置恢复下载事件

func (*Downloader) OnSuccess 

func (der *Downloader) OnSuccess(onSuccessEvent requester.Event)

OnSuccess 设置成功下载事件

func (*Downloader) Pause 

func (der *Downloader) Pause()

Pause 暂停

func (*Downloader) Resume 

func (der *Downloader) Resume()

Resume 恢复

func (*Downloader) SelectBlockSizeAndInitRangeGen 

func (der *Downloader) SelectBlockSizeAndInitRangeGen(single bool, status *transfer.DownloadStatus, parallel int) (blockSize int64, initErr error)

SelectBlockSizeAndInitRangeGen 获取合适的 BlockSize, 和初始化 RangeGen

func (*Downloader) SelectCacheSize 

func (der *Downloader) SelectCacheSize(confCacheSize int, blockSize int64) (cacheSize int)

SelectCacheSize 获取合适的 cacheSize

func (*Downloader) SelectParallel 

func (der *Downloader) SelectParallel(single bool, maxParallel int, totalSize int64, instanceRangeList transfer.RangeList) (parallel int)

SelectParallel 获取合适的 parallel

func (*Downloader) SetClient 

func (der *Downloader) SetClient(client *requester.HTTPClient)

SetClient 设置http客户端

func (*Downloader) SetDriveId 

func (der *Downloader) SetDriveId(driveId string)

func (*Downloader) SetFileInfo 

func (der *Downloader) SetFileInfo(f *aliyunpan.FileEntity)

SetClient 设置http客户端

func (*Downloader) SetLoadBalancerCompareFunc 

func (der *Downloader) SetLoadBalancerCompareFunc(f LoadBalancerCompareFunc)

SetLoadBalancerCompareFunc 设置负载均衡检测函数

func (*Downloader) SetStatusCodeBodyCheckFunc 

func (der *Downloader) SetStatusCodeBodyCheckFunc(f StatusCodeBodyCheckFunc)

SetStatusCodeBodyCheckFunc 设置响应状态码出错的检查函数, 当FirstCheckMethod不为HEAD时才有效

type Fder 

type Fder interface {
	Fd() uintptr
}

Fder 获取fd接口

type InstanceState 

type InstanceState struct {
	// contains filtered or unexported fields
}

InstanceState 状态, 断点续传信息

func NewInstanceState 

func NewInstanceState(saveFile *os.File, format InstanceStateStorageFormat) *InstanceState

NewInstanceState 初始化InstanceState

func (*InstanceState) Close 

func (is *InstanceState) Close() error

Close 关闭

func (*InstanceState) Get 

func (is *InstanceState) Get() (eii *transfer.DownloadInstanceInfo)

Get 获取断点续传信息

func (*InstanceState) Put 

func (is *InstanceState) Put(eii *transfer.DownloadInstanceInfo)

Put 提交断点续传信息

type InstanceStateStorageFormat 

type InstanceStateStorageFormat int

InstanceStateStorageFormat 断点续传储存类型

type LoadBalancerCompareFunc 

type LoadBalancerCompareFunc func(info map[string]string, subResp *http.Response) bool

type LoadBalancerResponse 

type LoadBalancerResponse struct {
	URL string
}

LoadBalancerResponse 负载均衡响应状态

type LoadBalancerResponseList 

type LoadBalancerResponseList struct {
	// contains filtered or unexported fields
}

LoadBalancerResponseList 负载均衡列表

func NewLoadBalancerResponseList 

func NewLoadBalancerResponseList(lbr []*LoadBalancerResponse) *LoadBalancerResponseList

NewLoadBalancerResponseList 初始化负载均衡列表

func (*LoadBalancerResponseList) RandomGet 

func (lbrl *LoadBalancerResponseList) RandomGet() *LoadBalancerResponse

RandomGet 随机获取

func (*LoadBalancerResponseList) SequentialGet 

func (lbrl *LoadBalancerResponseList) SequentialGet() *LoadBalancerResponse

SequentialGet 顺序获取

type Monitor 

type Monitor struct {
	// contains filtered or unexported fields
}

Monitor 线程监控器

func NewMonitor 

func NewMonitor() *Monitor

NewMonitor 初始化Monitor

func (*Monitor) Append 

func (mt *Monitor) Append(worker *Worker)

Append 增加Worker

func (*Monitor) CompletedChan 

func (mt *Monitor) CompletedChan() <-chan struct{}

CompletedChan 获取completed chan

func (*Monitor) DynamicSplitWorker 

func (mt *Monitor) DynamicSplitWorker(worker *Worker)

DynamicSplitWorker 动态分配线程

func (*Monitor) Err 

func (mt *Monitor) Err() error

Err 返回遇到的错误

func (*Monitor) Execute 

func (mt *Monitor) Execute(cancelCtx context.Context)

Execute 执行任务

func (*Monitor) GetAllWorkersRange 

func (mt *Monitor) GetAllWorkersRange() transfer.RangeList

GetAllWorkersRange 获取所有worker的范围

func (*Monitor) GetAvailableWorker 

func (mt *Monitor) GetAvailableWorker() *Worker

GetAvailableWorker 获取空闲的worker

func (*Monitor) InitMonitorCapacity 

func (mt *Monitor) InitMonitorCapacity(capacity int)

InitMonitorCapacity 初始化workers, 用于Append

func (*Monitor) IsLeftWorkersAllFailed 

func (mt *Monitor) IsLeftWorkersAllFailed() bool

IsLeftWorkersAllFailed 剩下的线程是否全部失败

func (*Monitor) NumLeftWorkers 

func (mt *Monitor) NumLeftWorkers() (num int)

NumLeftWorkers 剩余的worker数量

func (*Monitor) Pause 

func (mt *Monitor) Pause()

Pause 暂停所有的下载

func (*Monitor) RangeWorker 

func (mt *Monitor) RangeWorker(f RangeWorkerFunc)

RangeWorker 遍历worker

func (*Monitor) ResetFailedAndNetErrorWorkers 

func (mt *Monitor) ResetFailedAndNetErrorWorkers()

ResetFailedAndNetErrorWorkers 重设部分网络错误的worker

func (*Monitor) ResetWorker 

func (mt *Monitor) ResetWorker(worker *Worker)

ResetWorker 重设长时间无响应, 和下载速度为 0 的 Worker

func (*Monitor) Resume 

func (mt *Monitor) Resume()

Resume 恢复所有的下载

func (*Monitor) SetInstanceState 

func (mt *Monitor) SetInstanceState(instanceState *InstanceState)

SetInstanceState 设置状态

func (*Monitor) SetReloadWorker 

func (mt *Monitor) SetReloadWorker(b bool)

SetReloadWorker 是否重载worker

func (*Monitor) SetStatus 

func (mt *Monitor) SetStatus(status *transfer.DownloadStatus)

SetStatus 设置DownloadStatus

func (*Monitor) SetWorkers 

func (mt *Monitor) SetWorkers(workers WorkerList)

SetWorkers 设置workers, 此操作会覆盖原有的workers

func (*Monitor) Status 

func (mt *Monitor) Status() *transfer.DownloadStatus

Status 返回DownloadStatus

func (*Monitor) TryAddNewWork 

func (mt *Monitor) TryAddNewWork()

TryAddNewWork 尝试加入新range

type RangeWorkerFunc 

type RangeWorkerFunc func(key int, worker *Worker) bool

RangeWorkerFunc 遍历workers的函数

type ResetController 

type ResetController struct {
	// contains filtered or unexported fields
}

ResetController 网络连接控制器

func NewResetController 

func NewResetController(maxResetNum int) *ResetController

NewResetController 初始化*ResetController

func (*ResetController) AddResetNum 

func (rc *ResetController) AddResetNum()

AddResetNum 增加连接

func (*ResetController) CanReset 

func (rc *ResetController) CanReset() bool

CanReset 是否可以建立连接

type StatusCode 

type StatusCode int

StatusCode 状态码 

const (
	//StatusCodeInit 初始化
	StatusCodeInit StatusCode = iota
	//StatusCodeSuccessed 成功
	StatusCodeSuccessed
	//StatusCodePending 等待响应
	StatusCodePending
	//StatusCodeDownloading 下载中
	StatusCodeDownloading
	//StatusCodeWaitToWrite 等待写入数据
	StatusCodeWaitToWrite
	//StatusCodeInternalError 内部错误
	StatusCodeInternalError
	//StatusCodeTooManyConnections 连接数太多
	StatusCodeTooManyConnections
	//StatusCodeNetError 网络错误
	StatusCodeNetError
	//StatusCodeFailed 下载失败
	StatusCodeFailed
	//StatusCodePaused 已暂停
	StatusCodePaused
	//StatusCodeReseted 已重设连接
	StatusCodeReseted
	//StatusCodeCanceled 已取消
	StatusCodeCanceled
	//StatusCodeDownloadUrlExpired 下载链接已过期
	StatusCodeDownloadUrlExpired
	//StatusCodeIllegalDownloadFile 文件非法，不允许下载
	StatusCodeIllegalDownloadFile
)

type StatusCodeBodyCheckFunc 

type StatusCodeBodyCheckFunc func(respBody io.Reader) error

StatusCodeBodyCheckFunc 响应状态码出错的检查函数

type Worker 

type Worker struct {
	// contains filtered or unexported fields
}

Worker 工作单元

func NewWorker 

func NewWorker(id int, driveId string, fileId, durl string, writerAt io.WriterAt, globalSpeedsStat *speeds.Speeds) *Worker

NewWorker 初始化Worker

func (*Worker) Cancel 

func (wer *Worker) Cancel() error

Cancel 取消下载

func (*Worker) Canceled 

func (wer *Worker) Canceled() bool

Canceled 是否已经取消

func (*Worker) ClearStatus 

func (wer *Worker) ClearStatus()

ClearStatus 清空状态

func (*Worker) Completed 

func (wer *Worker) Completed() bool

Completed 是否已经完成

func (*Worker) Err 

func (wer *Worker) Err() error

Err 返回worker错误

func (*Worker) Execute 

func (wer *Worker) Execute()

Execute 执行任务

func (*Worker) Failed 

func (wer *Worker) Failed() bool

Failed 是否失败

func (*Worker) GetRange 

func (wer *Worker) GetRange() *transfer.Range

GetRange 返回worker范围

func (*Worker) GetSpeedsPerSecond 

func (wer *Worker) GetSpeedsPerSecond() int64

GetSpeedsPerSecond 获取每秒的速度

func (*Worker) GetStatus 

func (wer *Worker) GetStatus() WorkerStatuser

GetStatus 返回下载状态

func (*Worker) ID 

func (wer *Worker) ID() int

ID 返回worker ID

func (*Worker) Pause 

func (wer *Worker) Pause()

Pause 暂停下载

func (*Worker) RefreshDownloadUrl 

func (wer *Worker) RefreshDownloadUrl()

RefreshDownloadUrl 重新刷新下载链接

func (*Worker) Reset 

func (wer *Worker) Reset()

Reset 重设连接

func (*Worker) Resume 

func (wer *Worker) Resume()

Resume 恢复下载

func (*Worker) SetAcceptRange 

func (wer *Worker) SetAcceptRange(acceptRanges string)

SetAcceptRange 设置AcceptRange

func (*Worker) SetClient 

func (wer *Worker) SetClient(c *requester.HTTPClient)

SetClient 设置http客户端

func (*Worker) SetDownloadStatus 

func (wer *Worker) SetDownloadStatus(downloadStatus *transfer.DownloadStatus)

SetDownloadStatus 增加其他需要统计的数据

func (*Worker) SetPanClient 

func (wer *Worker) SetPanClient(p *config.PanClient)

func (*Worker) SetRange 

func (wer *Worker) SetRange(r *transfer.Range)

SetRange 设置请求范围

func (*Worker) SetTotalSize 

func (wer *Worker) SetTotalSize(size int64)

SetTotalSize 设置整个文件的大小, worker请求range时会获取尝试获取该值, 如果不匹配, 则返回错误

func (*Worker) SetUrl added in v0.3.0 

func (wer *Worker) SetUrl(newUrl string)

SetUrl 更新新的下载路径

func (*Worker) SetWriteMutex 

func (wer *Worker) SetWriteMutex(mu *sync.Mutex)

SetWriteMutex 设置数据写锁

type WorkerList 

type WorkerList []*Worker

WorkerList worker列表

func (WorkerList) Duplicate 

func (wl WorkerList) Duplicate() WorkerList

Duplicate 构造新的列表

func (WorkerList) Len 

func (wl WorkerList) Len() int

Len 返回长度

func (WorkerList) Swap 

func (wl WorkerList) Swap(i, j int)

Swap 交换

type WorkerStatus 

type WorkerStatus struct {
	// contains filtered or unexported fields
}

WorkerStatus worker状态

func NewWorkerStatus 

func NewWorkerStatus() *WorkerStatus

NewWorkerStatus 初始化WorkerStatus

func (*WorkerStatus) SetStatusCode 

func (ws *WorkerStatus) SetStatusCode(sc StatusCode)

SetStatusCode 设置worker状态码

func (*WorkerStatus) StatusCode 

func (ws *WorkerStatus) StatusCode() StatusCode

StatusCode 返回状态码

func (*WorkerStatus) StatusText 

func (ws *WorkerStatus) StatusText() string

StatusText 返回状态信息

type WorkerStatuser 

type WorkerStatuser interface {
	StatusCode() StatusCode //状态码
	StatusText() string
}

WorkerStatuser 状态

type Writer 

type Writer interface {
	io.WriterAt
}

Writer 下载器数据输出接口

func NewDownloaderWriterByFilename 

func NewDownloaderWriterByFilename(name string, flag int, perm os.FileMode) (writer Writer, file *os.File, err error)

NewDownloaderWriterByFilename 创建下载器数据输出接口, 类似于os.OpenFile

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