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cloudreve/pkg/filesystem/image.go

149 lines
4.1 KiB

package filesystem
import (
"context"
"fmt"
"sync"
"runtime"
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/conf"
"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/fsctx"
"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/response"
"github.com/cloudreve/Cloudreve/v3/pkg/thumb"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
)
/* ================
================
*/
// HandledExtension 可以生成缩略图的文件扩展名
var HandledExtension = []string{"jpg", "jpeg", "png", "gif"}
// GetThumb 获取文件的缩略图
func (fs *FileSystem) GetThumb(ctx context.Context, id uint) (*response.ContentResponse, error) {
// 根据 ID 查找文件
err := fs.resetFileIDIfNotExist(ctx, id)
if err != nil || fs.FileTarget[0].PicInfo == "" {
return &response.ContentResponse{
Redirect: false,
}, ErrObjectNotExist
}
w, h := fs.GenerateThumbnailSize(0, 0)
ctx = context.WithValue(ctx, fsctx.ThumbSizeCtx, [2]uint{w, h})
ctx = context.WithValue(ctx, fsctx.FileModelCtx, fs.FileTarget[0])
res, err := fs.Handler.Thumb(ctx, fs.FileTarget[0].SourceName)
// 本地存储策略出错时重新生成缩略图
if err != nil && fs.Policy.Type == "local" {
fs.GenerateThumbnail(ctx, &fs.FileTarget[0])
res, err = fs.Handler.Thumb(ctx, fs.FileTarget[0].SourceName)
}
if err == nil && conf.SystemConfig.Mode == "master" {
res.MaxAge = model.GetIntSetting("preview_timeout", 60)
}
return res, err
}
// thumbPool 要使用的任务池
var thumbPool *Pool
var once sync.Once
// Pool 带有最大配额的任务池
type Pool struct {
// 容量
worker chan int
}
// Init 初始化任务池
func getThumbWorker() *Pool {
once.Do(func() {
maxWorker := model.GetIntSetting("thumb_max_task_count", -1)
if maxWorker <= 0 {
maxWorker = runtime.GOMAXPROCS(0)
}
thumbPool = &Pool{
worker: make(chan int, maxWorker),
}
util.Log().Debug("Initialize thumbnails task queue with: WorkerNum = %d", maxWorker)
})
return thumbPool
}
func (pool *Pool) addWorker() {
pool.worker <- 1
util.Log().Debug("Worker added to thumbnails task queue.")
}
func (pool *Pool) releaseWorker() {
util.Log().Debug("Worker released from thumbnails task queue.")
<-pool.worker
}
// GenerateThumbnail 尝试为本地策略文件生成缩略图并获取图像原始大小
// TODO 失败时,如果之前还有图像信息,则清除
func (fs *FileSystem) GenerateThumbnail(ctx context.Context, file *model.File) {
// 判断是否可以生成缩略图
if !IsInExtensionList(HandledExtension, file.Name) {
return
}
// 新建上下文
newCtx, cancel := context.WithCancel(context.Background())
defer cancel()
// 获取文件数据
source, err := fs.Handler.Get(newCtx, file.SourceName)
if err != nil {
return
}
defer source.Close()
getThumbWorker().addWorker()
defer getThumbWorker().releaseWorker()
image, err := thumb.NewThumbFromFile(source, file.Name)
if err != nil {
util.Log().Warning("Cannot generate thumb because of failed to parse image %q: %s", file.SourceName, err)
return
}
// 获取原始图像尺寸
w, h := image.GetSize()
// 生成缩略图
image.GetThumb(fs.GenerateThumbnailSize(w, h))
// 保存到文件
err = image.Save(util.RelativePath(file.SourceName + model.GetSettingByNameWithDefault("thumb_file_suffix", "._thumb")))
image = nil
if model.IsTrueVal(model.GetSettingByName("thumb_gc_after_gen")) {
util.Log().Debug("GenerateThumbnail runtime.GC")
runtime.GC()
}
if err != nil {
util.Log().Warning("Failed to save thumb: %s", err)
return
}
// 更新文件的图像信息
if file.Model.ID > 0 {
err = file.UpdatePicInfo(fmt.Sprintf("%d,%d", w, h))
} else {
file.PicInfo = fmt.Sprintf("%d,%d", w, h)
}
// 失败时删除缩略图文件
if err != nil {
_, _ = fs.Handler.Delete(newCtx, []string{file.SourceName + model.GetSettingByNameWithDefault("thumb_file_suffix", "._thumb")})
}
}
// GenerateThumbnailSize 获取要生成的缩略图的尺寸
func (fs *FileSystem) GenerateThumbnailSize(w, h int) (uint, uint) {
return uint(model.GetIntSetting("thumb_width", 400)), uint(model.GetIntSetting("thumb_width", 300))
}