86 lines
2.0 KiB
Go
86 lines
2.0 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, ptr *Pointer, cb gitmedia.CopyCallback) error {
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mediafile, err := gitmedia.LocalMediaPath(ptr.Oid)
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if err != nil {
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return err
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}
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var wErr *gitmedia.WrappedError
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if stat, statErr := os.Stat(mediafile); statErr != nil || stat == nil {
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wErr = downloadFile(writer, ptr, mediafile, cb)
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} else {
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wErr = readLocalFile(writer, ptr, mediafile, cb)
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}
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if wErr != nil {
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return &SmudgeError{ptr.Oid, mediafile, wErr}
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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, ptr *Pointer, mediafile string, cb gitmedia.CopyCallback) *gitmedia.WrappedError {
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reader, size, wErr := gitmediaclient.Get(mediafile)
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if reader != nil {
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defer reader.Close()
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}
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if wErr != nil {
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wErr.Errorf("Error downloading %s.", mediafile)
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return wErr
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}
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if ptr.Size == 0 {
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ptr.Size = size
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}
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mediaWriter, err := newFile(mediafile, ptr.Oid)
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if err != nil {
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return gitmedia.Errorf(err, "Error opening media file buffer.")
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}
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_, copyErr := gitmedia.CopyWithCallback(writer, reader, ptr.Size, cb)
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closeErr := mediaWriter.Close()
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if copyErr != nil {
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return gitmedia.Errorf(copyErr, "Error buffering media file.")
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}
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if closeErr != nil {
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return gitmedia.Errorf(closeErr, "Error closing saved media file buffer.")
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}
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return readLocalFile(writer, ptr, mediaWriter.Path, nil)
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}
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func readLocalFile(writer io.Writer, ptr *Pointer, mediafile string, cb gitmedia.CopyCallback) *gitmedia.WrappedError {
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reader, err := os.Open(mediafile)
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if err != nil {
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return gitmedia.Errorf(err, "Error opening media file.")
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}
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defer reader.Close()
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if ptr.Size == 0 {
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if stat, _ := os.Stat(mediafile); stat != nil {
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ptr.Size = stat.Size()
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}
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}
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_, err = gitmedia.CopyWithCallback(writer, reader, ptr.Size, cb)
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return gitmedia.Errorf(err, "Error reading from media file.")
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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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*gitmedia.WrappedError
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}
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