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Created by
Alexey Luchko
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http://peter.bourgon.org/blog/2017/06/09/theory-of-modern-go.html
type ImageSource interface {
GetImage(...) ...
}
type H struct {
GetImage func(id string) (image.Image, error)
GetImage ImageSource
//Formatter func (http.ResponceWriter, image.Image)
Formatter func (io.Writer, image.Image)
}
func main() {
// GetImage func(id string) (image.Image, error)
http.Handle("/user/150/", &H{
GetImage: NewImageSource("/srv/static/image/user/")
})
http.Handle("/user/150/", &H{
GetImage: NewImageSource("/srv/static/image/user/").GetImage
})
http.Handle("/user/150/", &H{
GetImage: ImageSource("/srv/static/image/user/").GetImage
})
// GetImage ImageSource interface
http.Handle("/user/150/", &H{
GetImage: NewImageSource("/srv/static/image/user/")
})
http.Handle("/user/150/", &H{
GetImage: ImageSource("/srv/static/image/user/")
})
}
type ImageSource func(id string) (image.Image, error)
func NewImageSource(root string) ImageSource {
return func(id string) {
p := path.Join(root, id[-2:], id)
f, err := os.Open(p)
if err != nil {
return nil, err
}
defer f.Close()
return image.Decode(f)
}
}
type ImageSource struct {
root string
}
func NewImageSource(root string) ImageSource {
return ImageSource{root}
}
func (s ImageSource) GetImage(id string) {
p := path.Join(s.root, id[-2:], id)
f, err := os.Open(p)
if err != nil {
return nil, err
}
defer f.Close()
return image.Decode(f)
}
type ImageSource string
func (root ImageSource) GetImage(id string) {
p := path.Join(root, id[-2:], id)
f, err := os.Open(p)
if err != nil {
return nil, err
}
defer f.Close()
return image.Decode(f)
}
func (h H) ServeHTTP(w ..., r ...) {
id, err := h.getID(r.URL.Path)
if err != nil {
...
}
img, err := h.GetImage(id)
if err != nil {
...
}
img := h.resize(img)
h.Formatter(w, img)
}
type ImageEncoder interface {
Encode(io.Writer, image.Image)
}
type H2 struct {
ImageEncoder
}
func (h H2) ServeHTTP(w ..., r ...) {
....
h.ImageEncoder.Encode(w, img)
}
|
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