74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// Copyright 2015 The Gogs Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package git
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"os"
|
|
"os/exec"
|
|
)
|
|
|
|
// Blob represents a Git object.
|
|
type Blob struct {
|
|
repo *Repository
|
|
*TreeEntry
|
|
}
|
|
|
|
// Data gets content of blob all at once and wrap it as io.Reader.
|
|
// This can be very slow and memory consuming for huge content.
|
|
func (b *Blob) Data() (io.Reader, error) {
|
|
stdout := new(bytes.Buffer)
|
|
stderr := new(bytes.Buffer)
|
|
|
|
// Preallocate memory to save ~50% memory usage on big files.
|
|
stdout.Grow(int(b.Size() + 2048))
|
|
|
|
if err := b.DataPipeline(stdout, stderr); err != nil {
|
|
return nil, concatenateError(err, stderr.String())
|
|
}
|
|
return stdout, nil
|
|
}
|
|
|
|
// DataPipeline gets content of blob and write the result or error to stdout or stderr
|
|
func (b *Blob) DataPipeline(stdout, stderr io.Writer) error {
|
|
return NewCommand("show", b.ID.String()).RunInDirPipeline(b.repo.Path, stdout, stderr)
|
|
}
|
|
|
|
type cmdReadCloser struct {
|
|
cmd *exec.Cmd
|
|
stdout io.Reader
|
|
}
|
|
|
|
func (c cmdReadCloser) Read(p []byte) (int, error) {
|
|
return c.stdout.Read(p)
|
|
}
|
|
|
|
func (c cmdReadCloser) Close() error {
|
|
io.Copy(ioutil.Discard, c.stdout)
|
|
return c.cmd.Wait()
|
|
}
|
|
|
|
// DataAsync gets a ReadCloser for the contents of a blob without reading it all.
|
|
// Calling the Close function on the result will discard all unread output.
|
|
func (b *Blob) DataAsync() (io.ReadCloser, error) {
|
|
cmd := exec.Command("git", "show", b.ID.String())
|
|
cmd.Dir = b.repo.Path
|
|
cmd.Stderr = os.Stderr
|
|
|
|
stdout, err := cmd.StdoutPipe()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("StdoutPipe: %v", err)
|
|
}
|
|
|
|
if err = cmd.Start(); err != nil {
|
|
return nil, fmt.Errorf("Start: %v", err)
|
|
}
|
|
|
|
return cmdReadCloser{stdout: stdout, cmd: cmd}, nil
|
|
}
|