// Returns function that stores a tile as an optionally compressed PNG image.
func (d *Data) putTileFunc(versionID dvid.VersionID) (outFunc, error) {
imstore, err := storage.ImmutableStore()
if err != nil {
return nil, fmt.Errorf("Cannot open immutable store: %v\n", err)
}
ctx := datastore.NewVersionedCtx(d, versionID)
return func(index *IndexTile, tile *dvid.Image) error {
var err error
var data []byte
switch d.Encoding {
case LZ4:
compression, err := dvid.NewCompression(dvid.LZ4, dvid.DefaultCompression)
if err != nil {
return err
}
data, err = tile.Serialize(compression, d.Checksum())
case PNG:
data, err = tile.GetPNG()
case JPG:
data, err = tile.GetJPEG(d.Quality)
}
if err != nil {
return err
}
return imstore.Put(ctx, index.Bytes(), data)
}, nil
}
// getTileData returns 2d tile data straight from storage without decoding.
func (d *Data) getTileData(ctx storage.Context, req tileReq) ([]byte, error) {
imstore, err := storage.ImmutableStore()
if err != nil {
return nil, err
}
// Retrieve the tile data from datastore
data, err := imstore.Get(ctx, req.Bytes())
if err != nil {
return nil, fmt.Errorf("Error trying to GET from datastore: %v", err)
}
return data, nil
}
// getTileData returns 2d tile data straight from storage without decoding.
func (d *Data) getTileData(ctx storage.Context, req tileReq) ([]byte, error) {
if d.Levels == nil {
return nil, fmt.Errorf("Tiles have not been generated.")
}
imstore, err := storage.ImmutableStore()
if err != nil {
return nil, err
}
// Retrieve the tile data from datastore
tileIndex := &IndexTile{&req.indexZYX, req.shape, req.scaling}
data, err := imstore.Get(ctx, tileIndex.Bytes())
if err != nil {
return nil, fmt.Errorf("Error trying to GET from datastore: %v", err)
}
return data, nil
}
// PostTile stores a tile.
func (d *Data) PostTile(uuid dvid.UUID, ctx storage.Context, w http.ResponseWriter,
r *http.Request, parts []string) error {
tileReq, err := d.parseTileReq(r, parts)
if err != nil {
return err
}
data, err := ioutil.ReadAll(r.Body)
if err != nil {
return err
}
imstore, err := storage.ImmutableStore()
if err != nil {
return fmt.Errorf("Cannot open immutable store: %v\n", err)
}
return imstore.Put(ctx, tileReq.Bytes(), data)
}