// BufPut - buffered put - saves its contents to memory, to memcache and the datastore
// Todo: Don't buffer in local memory.
func BufPut(w http.ResponseWriter, r *http.Request, wb WrapBlob, skey string) (mkk string, errClosure error) {
c := appengine.NewContext(r)
t := fmt.Sprintf("%T", wb)
mkk = t + "__" + skey // kombi key
errClosure = datastore.RunInTransaction(c,
func(c appengine.Context) error {
dskey1 := datastore.NewKey(c, t, skey, 0, nil)
_, err := datastore.Put(c, dskey1, &wb)
McacheSet(c, mkk, wb)
memoryInstanceStore[mkk] = &wb
multiCastInstanceCacheChange(w, r, mkk)
c.Infof("saved to ds and memcache and instance RAM - combikey is %v", mkk)
return err
}, nil)
util_err.Err_panic(errClosure)
return
}
// we want to extract the 'image/png' from
// "data:image/png;base64,..."
//func MimeFromBase64(b *bytes.Buffer)(mime string){
func MimeFromBase64(b io.Reader) (mime string) {
// to avoid huge string allocation
// we read the first 100 bytes
b1 := make([]byte, 100)
_, err := b.Read(b1)
util_err.Err_panic(err)
s := string(b1)
pos := base64HeaderPosition(s)
if pos > 0 {
tmp1 := s[:pos]
tmp2 := strings.Split(tmp1, ";")
tmp3 := strings.Split(tmp2[0], ":")
mime = tmp3[1]
}
return
}