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resource: Use MD5 to identify image files

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But only a set of byte chunks spread around in the image file to calculate the fingerprint, which is much faster than reading the whole file:

```bash
BenchmarkMD5FromFileFast/full=false-4         	  300000	      4356 ns/op	     240 B/op	       5 allocs/op
BenchmarkMD5FromFileFast/full=true-4          	   30000	     42899 ns/op	   32944 B/op	       5 allocs/op
```

Fixes #4186
This commit is contained in:
Bjørn Erik Pedersen 2017-12-27 19:31:42 +01:00
parent 7e76a6fd3b
commit e50a8c7a14
7 changed files with 176 additions and 26 deletions
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12
resource/resource.go
View file

@ -153,7 +153,19 @@ func (r *Spec) newResource(
gr := r.newGenericResource(linker, fi, absPublishDir, absSourceFilename, filepath.ToSlash(relTargetFilename), mimeType)
if mimeType == "image" {
f, err := r.Fs.Source.Open(absSourceFilename)
if err != nil {
return nil, err
}
defer f.Close()
hash, err := helpers.MD5FromFileFast(f)
if err != nil {
return nil, err
}
return &Image{
hash: hash,
imaging: r.imaging,
genericResource: gr}, nil
}