81 lines
1.4 KiB
Go
81 lines
1.4 KiB
Go
package pointer
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import (
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"github.com/github/git-media/gitmedia"
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"github.com/github/git-media/gitmediaclient"
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"io"
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"os"
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)
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func Smudge(writer io.Writer, oid string) error {
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mediafile, err := gitmedia.LocalMediaPath(oid)
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if err != nil {
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return err
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}
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if stat, statErr := os.Stat(mediafile); statErr != nil || stat == nil {
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err = downloadFile(writer, oid, mediafile)
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} else {
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err = readLocalFile(writer, mediafile)
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}
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if err != nil {
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return &SmudgeError{oid, mediafile, err.Error()}
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} else {
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return nil
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}
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}
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func downloadFile(writer io.Writer, oid, mediafile string) error {
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reader, err := gitmediaclient.Get(mediafile)
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if err != nil {
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return err
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}
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defer reader.Close()
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mediaWriter, err := newFile(mediafile, oid)
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if err != nil {
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return err
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}
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copyErr := copyFile(reader, writer, mediaWriter)
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closeErr := mediaWriter.Close()
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if copyErr != nil {
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return copyErr
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}
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if closeErr != nil {
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return closeErr
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}
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return nil
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}
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func readLocalFile(writer io.Writer, mediafile string) error {
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reader, err := os.Open(mediafile)
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if err != nil {
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return err
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}
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defer reader.Close()
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return copyFile(reader, writer)
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}
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func copyFile(reader io.ReadCloser, writers ...io.Writer) error {
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multiWriter := io.MultiWriter(writers...)
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_, err := io.Copy(multiWriter, reader)
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return err
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}
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type SmudgeError struct {
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Oid string
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Filename string
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ErrorMessage string
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}
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func (e *SmudgeError) Error() string {
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return e.ErrorMessage
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}
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