367 lines
9.5 KiB
Go
367 lines
9.5 KiB
Go
package controller
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"pikapi/main/database/comic_center"
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utils2 "pikapi/main/utils"
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"time"
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)
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// 使用协程进行后台下载
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// downloadRunning 如果为false则停止下载
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// downloadRestart 为true则取消从新启动下载功能
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var downloadRunning = false
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var downloadRestart = false
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var downloadingComic *comic_center.ComicDownload
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var downloadingEp *comic_center.ComicDownloadEp
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var downloadingPicture *comic_center.ComicDownloadPicture
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var dlFlag = true
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// 程序启动后仅调用一次, 启动后台线程
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func downloadBackground() {
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println("后台线程启动")
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if dlFlag {
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dlFlag = false
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go downloadBegin()
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}
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}
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// 下载启动/重新启动会暂停三秒
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func downloadBegin() {
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time.Sleep(time.Second * 3)
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go downloadLoadComic()
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}
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// 下载周期中, 每个下载单元会调用此方法, 如果返回true应该停止当前动作
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func downloadHasStop() bool {
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if !downloadRunning {
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go downloadBegin()
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return true
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}
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if downloadRestart {
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downloadRestart = false
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go downloadBegin()
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return true
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}
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return false
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}
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// 删除下载任务, 当用户要删除下载的时候, 他会被加入删除队列, 而不是直接被删除, 以减少出错
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func downloadDelete() bool {
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c, e := comic_center.DeletingComic()
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if e != nil {
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panic(e)
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}
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if c != nil {
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os.RemoveAll(downloadPath(c.ID))
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e = comic_center.TrueDelete(c.ID)
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if e != nil {
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panic(e)
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}
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return true
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}
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return false
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}
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// 加载第一个需要下载的漫画
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func downloadLoadComic() {
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// 每次下载完一个漫画, 或者启动的时候, 首先进行删除任务
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for downloadDelete() {
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}
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// 检测是否需要停止
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if downloadHasStop() {
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return
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}
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// 找到第一个要下载的漫画, 查库有错误就停止, 因为这些错误很少出现, 一旦出现必然是严重的, 例如数据库文件突然被删除
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var err error
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downloadingComic, err = comic_center.LoadFirstNeedDownload()
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if err != nil {
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panic(err)
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}
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// 处理找到的下载任务
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go downloadInitComic()
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}
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// 初始化找到的下载任务
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func downloadInitComic() {
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// 检测是否需要停止
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if downloadHasStop() {
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return
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}
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// 若没有漫画要下载则重新启动
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if downloadingComic == nil {
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println("没有找到要下载的漫画")
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go downloadBegin()
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return
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}
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// 打印日志, 并向前端的eventChannel发送下载信息
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println("正在下载漫画 " + downloadingComic.Title)
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downloadComicEventSend(downloadingComic)
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eps, err := comic_center.ListDownloadEpByComicId(downloadingComic.ID)
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if err != nil {
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panic(err)
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}
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// 找到这个漫画需要下载的EP, 并搜索获取图片地址
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for _, ep := range eps {
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// FetchedPictures字段标志着这个章节的图片地址有没有获取过, 如果没有获取过就重新获取
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if !ep.FetchedPictures {
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println("正在获取章节的图片 " + downloadingComic.Title + " " + ep.Title)
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// 搜索图片地址, 如果五次没有请求成功, 就不在请求
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for i := 0; i < 5; i++ {
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if client.Token == "" {
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continue
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}
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err := downloadFetchPictures(&ep)
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if err != nil {
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println(err.Error())
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continue
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}
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ep.FetchedPictures = true
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break
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}
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// 如果未能获取图片地址, 则直接置为失败
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if !ep.FetchedPictures {
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println("章节的图片获取失败 " + downloadingComic.Title + " " + ep.Title)
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err = comic_center.EpFailed(ep.ID)
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if err != nil {
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panic(err)
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}
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} else {
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println("章节的图片获取成功 " + downloadingComic.Title + " " + ep.Title)
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downloadingComic.SelectedPictureCount = downloadingComic.SelectedPictureCount + ep.SelectedPictureCount
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downloadComicEventSend(downloadingComic)
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}
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}
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}
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// 获取图片地址结束, 去初始化下载的章节
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go downloadLoadEp()
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}
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// 获取图片地址
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func downloadFetchPictures(downloadEp *comic_center.ComicDownloadEp) error {
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var list []comic_center.ComicDownloadPicture
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// 官方的图片只能分页获取, 从第1页开始获取, 每页最多40张图片
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page := 1
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for true {
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rsp, err := client.ComicPicturePage(downloadingComic.ID, int(downloadEp.EpOrder), page)
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if err != nil {
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return err
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}
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for _, doc := range rsp.Docs {
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list = append(list, comic_center.ComicDownloadPicture{
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ID: doc.Id,
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ComicId: downloadEp.ComicId,
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EpId: downloadEp.ID,
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EpOrder: downloadEp.EpOrder,
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OriginalName: doc.Media.OriginalName,
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FileServer: doc.Media.FileServer,
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Path: doc.Media.Path,
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})
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}
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// 如果不是最后一页, 页码加1, 获取下一页
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if rsp.Page.Page < rsp.Page.Pages {
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page++
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continue
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}
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break
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}
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// 保存获取到的图片
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err := comic_center.FetchPictures(downloadEp.ComicId, downloadEp.ID, &list)
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if err != nil {
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panic(err)
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}
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downloadEp.SelectedPictureCount = int32(len(list))
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return err
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}
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// 初始化下载
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func downloadLoadEp() {
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// 周期停止检测
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if downloadHasStop() {
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return
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}
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// 找到第一个需要下载的章节并去处理 （未下载失败的, 且未完成下载的）
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var err error
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downloadingEp, err = comic_center.LoadFirstNeedDownloadEp(downloadingComic.ID)
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if err != nil {
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panic(err)
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}
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go downloadInitEp()
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}
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// 处理需要下载的EP
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func downloadInitEp() {
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if downloadingEp == nil {
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// 所有Ep都下完了, 汇总Download下载情况
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go downloadSummaryDownload()
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return
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}
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// 没有下载完则去下载图片
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println("正在下载章节 " + downloadingEp.Title)
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go downloadLoadPicture()
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}
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// EP下载汇总
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func downloadSummaryDownload() {
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// 暂停检测
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if downloadHasStop() {
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return
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}
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// 加载这个漫画的所有EP
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list, err := comic_center.ListDownloadEpByComicId(downloadingComic.ID)
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if err != nil {
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panic(err)
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}
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// 判断所有章节是否下载完成
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over := true
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for _, downloadEp := range list {
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over = over && downloadEp.DownloadFinished
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}
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if over {
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// 如果所有章节下载完成则下载成功
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err = comic_center.DownloadSuccess(downloadingComic.ID)
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if err != nil {
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panic(err)
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}
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downloadingComic.DownloadFinished = true
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downloadingComic.DownloadFinishedTime = time.Now()
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} else {
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// 否则下载失败
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err = comic_center.DownloadFailed(downloadingComic.ID)
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if err != nil {
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panic(err)
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}
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downloadingComic.DownloadFailed = true
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}
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// 向前端发送下载状态
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downloadComicEventSend(downloadingComic)
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// 去下载下一个漫画
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go downloadLoadComic()
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}
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// 加载需要下载的图片
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func downloadLoadPicture() {
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// 暂停检测
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if downloadHasStop() {
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return
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}
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var err error
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downloadingPicture, err = comic_center.LoadFirstNeedDownloadPicture(downloadingEp.ID)
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if err != nil {
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panic(err)
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}
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go downloadInitPicture()
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}
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func downloadInitPicture() {
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// 暂停检测
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if downloadHasStop() {
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return
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}
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if downloadingPicture == nil {
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// 所有图片都下完了, 汇总EP下载情况
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go downloadSummaryEp()
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return
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}
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// 下载图片, 最多重试5次
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println("正在下载图片 " + fmt.Sprintf("%d", downloadingPicture.RankInEp))
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for i := 0; i < 5; i++ {
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err := downloadThePicture(downloadingPicture)
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if err != nil {
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continue
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}
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// 对下载的漫画临时变量热更新并通知前端
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downloadingPicture.DownloadFinished = true
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downloadingEp.DownloadPictureCount = downloadingEp.DownloadPictureCount + 1
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downloadingComic.DownloadPictureCount = downloadingComic.DownloadPictureCount + 1
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downloadComicEventSend(downloadingComic)
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break
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}
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// 没能下载成功, 图片置为下载失败
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if !downloadingPicture.DownloadFinished {
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err := comic_center.PictureFailed(downloadingPicture.ID)
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if err != nil {
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panic(err)
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}
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}
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// 加载下一张需要下载的图片
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go downloadLoadPicture()
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}
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// 下载指定图片
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func downloadThePicture(picturePoint *comic_center.ComicDownloadPicture) error {
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// 为了不和页面前端浏览的数据冲突, 使用url做hash锁
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lock := utils2.HashLock(fmt.Sprintf("%s$%s", picturePoint.FileServer, picturePoint.Path))
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lock.Lock()
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defer lock.Unlock()
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// 图片保存位置使用相对路径储存, 使用绝对路径操作
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picturePath := fmt.Sprintf("%s/%d/%d", picturePoint.ComicId, picturePoint.EpOrder, picturePoint.RankInEp)
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realPath := downloadPath(picturePath)
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// 从缓存获取图片
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buff, img, format, err := decodeFromCache(picturePoint.FileServer, picturePoint.Path)
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if err != nil {
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// 若缓存不存在, 则从网络获取
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buff, img, format, err = decodeFromUrl(picturePoint.FileServer, picturePoint.Path)
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}
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if err != nil {
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return err
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}
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// 将图片保存到文件
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dir := filepath.Dir(realPath)
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if _, err := os.Stat(dir); os.IsNotExist(err) {
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os.Mkdir(dir, utils2.CreateDirMode)
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}
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err = ioutil.WriteFile(downloadPath(picturePath), buff, utils2.CreateFileMode)
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if err != nil {
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return err
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}
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// 存入数据库
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return comic_center.PictureSuccess(
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picturePoint.ComicId,
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picturePoint.EpId,
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picturePoint.ID,
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int64(len(buff)),
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format,
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int32(img.Bounds().Dx()),
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int32(img.Bounds().Dy()),
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picturePath,
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)
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}
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// EP 下载内容汇总
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func downloadSummaryEp() {
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// 暂停检测
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if downloadHasStop() {
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return
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}
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// 找到所有下载的图片
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list, err := comic_center.ListDownloadPictureByEpId(downloadingEp.ID)
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if err != nil {
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panic(err)
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}
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// 全部下载完成置为成功, 否则置为失败
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over := true
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for _, downloadPicture := range list {
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over = over && downloadPicture.DownloadFinished
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}
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if over {
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err = comic_center.EpSuccess(downloadingEp.ComicId, downloadingEp.ID)
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if err != nil {
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panic(err)
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}
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} else {
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err = comic_center.EpFailed(downloadingEp.ID)
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if err != nil {
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panic(err)
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}
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}
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// 去加载下一个EP
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go downloadLoadEp()
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}
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