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|
package imagestore
import (
"bufio"
"io"
"os"
"path"
)
type LocalImageStore struct {
storeRoot string
namePathMapper *NamePathMapper
}
func NewLocalImageStore(root string, mapper *NamePathMapper) *LocalImageStore {
return &LocalImageStore{
storeRoot: root,
namePathMapper: mapper,
}
}
func (this *LocalImageStore) Exists(obj *StoreObject) (bool, error) {
if _, err := os.Stat(this.toPath(obj)); os.IsNotExist(err) {
return false, err
}
return true, nil
}
func (this *LocalImageStore) Save(src string, obj *StoreObject) (*StoreObject, error) {
// open input file
fi, err := os.Open(src)
if err != nil {
return nil, err
}
defer fi.Close()
// make a read buffer
r := bufio.NewReader(fi)
// open output file
this.createParent(obj)
fo, err := os.Create(this.toPath(obj))
if err != nil {
return nil, err
}
defer fo.Close()
// make a write buffer
w := bufio.NewWriter(fo)
// make a buffer to keep chunks that are read
buf := make([]byte, 1024)
for {
// read a chunk
n, err := r.Read(buf)
if err != nil && err != io.EOF {
return nil, err
}
if n == 0 {
break
}
// write a chunk
if _, err := w.Write(buf[:n]); err != nil {
return nil, err
}
}
if err = w.Flush(); err != nil {
return nil, err
}
obj.Url = this.toPath(obj)
obj.Url = stripPath(obj.Url)
return obj, nil
}
func (this *LocalImageStore) createParent(obj *StoreObject) {
path := path.Dir(this.toPath(obj))
if _, err := os.Stat(path); os.IsNotExist(err) {
os.MkdirAll(path, 0777)
}
}
func (this *LocalImageStore) toPath(obj *StoreObject) string {
return this.storeRoot + "/" + this.namePathMapper.mapToPath(obj)
}
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