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resource: Serialize image processing

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Fixes #5220
This commit is contained in:
Bjørn Erik Pedersen 2018-10-26 13:45:51 +02:00
parent df021317a9
commit 3a3badfd1d
1 changed files with 14 additions and 0 deletions
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14
resource/image.go
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@ -212,6 +212,15 @@ func (i *Image) isJPEG() bool {
return strings.HasSuffix(name, ".jpg") || strings.HasSuffix(name, ".jpeg")
}
// Serialize image processing. The imaging library spins up its own set of Go routines,
// so there is not much to gain from adding more load to the mix. That
// can even have negative effect in low resource scenarios.
// Note that this only effects the non-cached scenario. Once the processed
// image is written to disk, everything is fast, fast fast.
const imageProcWorkers = 1
var imageProcSem = make(chan bool, imageProcWorkers)
func (i *Image) doWithImageConfig(action, spec string, f func(src image.Image, conf imageConfig) (image.Image, error)) (*Image, error) {
conf, err := parseImageConfig(spec)
if err != nil {
@ -237,6 +246,11 @@ func (i *Image) doWithImageConfig(action, spec string, f func(src image.Image, c
}
return i.spec.imageCache.getOrCreate(i, conf, func(resourceCacheFilename string) (*Image, error) {
imageProcSem <- true
defer func() {
<-imageProcSem
}()
ci := i.clone()
errOp := action