85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package pointer
|
|
|
|
import (
|
|
"github.com/hawser/git-hawser/hawser"
|
|
"github.com/technoweenie/go-contentaddressable"
|
|
"io"
|
|
"os"
|
|
)
|
|
|
|
func Smudge(writer io.Writer, ptr *Pointer, cb hawser.CopyCallback) error {
|
|
mediafile, err := hawser.LocalMediaPath(ptr.Oid)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var wErr *hawser.WrappedError
|
|
if stat, statErr := os.Stat(mediafile); statErr != nil || stat == nil {
|
|
wErr = downloadFile(writer, ptr, mediafile, cb)
|
|
} else {
|
|
wErr = readLocalFile(writer, ptr, mediafile, cb)
|
|
}
|
|
|
|
if wErr != nil {
|
|
return &SmudgeError{ptr.Oid, mediafile, wErr}
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func downloadFile(writer io.Writer, ptr *Pointer, mediafile string, cb hawser.CopyCallback) *hawser.WrappedError {
|
|
reader, size, wErr := hawser.Download(mediafile)
|
|
if reader != nil {
|
|
defer reader.Close()
|
|
}
|
|
|
|
if wErr != nil {
|
|
wErr.Errorf("Error downloading %s.", mediafile)
|
|
return wErr
|
|
}
|
|
|
|
if ptr.Size == 0 {
|
|
ptr.Size = size
|
|
}
|
|
|
|
mediaFile, err := contentaddressable.NewFile(mediafile)
|
|
if err != nil {
|
|
return hawser.Errorf(err, "Error opening media file buffer.")
|
|
}
|
|
|
|
_, err = hawser.CopyWithCallback(mediaFile, reader, ptr.Size, cb)
|
|
if err == nil {
|
|
err = mediaFile.Accept()
|
|
}
|
|
mediaFile.Close()
|
|
|
|
if err != nil {
|
|
return hawser.Errorf(err, "Error buffering media file.")
|
|
}
|
|
|
|
return readLocalFile(writer, ptr, mediafile, nil)
|
|
}
|
|
|
|
func readLocalFile(writer io.Writer, ptr *Pointer, mediafile string, cb hawser.CopyCallback) *hawser.WrappedError {
|
|
reader, err := os.Open(mediafile)
|
|
if err != nil {
|
|
return hawser.Errorf(err, "Error opening media file.")
|
|
}
|
|
defer reader.Close()
|
|
|
|
if ptr.Size == 0 {
|
|
if stat, _ := os.Stat(mediafile); stat != nil {
|
|
ptr.Size = stat.Size()
|
|
}
|
|
}
|
|
|
|
_, err = hawser.CopyWithCallback(writer, reader, ptr.Size, cb)
|
|
return hawser.Errorf(err, "Error reading from media file.")
|
|
}
|
|
|
|
type SmudgeError struct {
|
|
Oid string
|
|
Filename string
|
|
*hawser.WrappedError
|
|
}
|