[bugfix] Close reader gracefully when streaming recache of remote media to fileserver api caller (#1281)

* close pipereader on failed data function

* gently slurp the bytes

* readability updates

* go fmt

* tidy up file server tests + add more cases

* start moving io wrappers to separate iotools package. Remove use of buffering while piping recache stream

Signed-off-by: kim <grufwub@gmail.com>

* add license text

Signed-off-by: kim <grufwub@gmail.com>
Co-authored-by: kim <grufwub@gmail.com>

internal/processing/media/util.go

@@ -20,7 +20,6 @@ package media
 
 import (
 	"fmt"
-	"io"
 	"strconv"
 	"strings"
 )
@@ -62,16 +61,3 @@ func parseFocus(focus string) (focusx, focusy float32, err error) {
 	focusy = float32(fy)
 	return
 }
-
-type teeReadCloser struct {
-	teeReader io.Reader
-	close     func() error
-}
-
-func (t teeReadCloser) Read(p []byte) (n int, err error) {
-	return t.teeReader.Read(p)
-}
-
-func (t teeReadCloser) Close() error {
-	return t.close()
-}