551f3cbe42
* govendor update code.gitea.io/git Signed-off-by: Duncan Ogilvie <mr.exodia.tpodt@gmail.com> * Greatly improve memory usage Signed-off-by: Duncan Ogilvie <mr.exodia.tpodt@gmail.com>
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
// Copyright 2015 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package git
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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)
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// Blob represents a Git object.
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type Blob struct {
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repo *Repository
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*TreeEntry
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}
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// Data gets content of blob all at once and wrap it as io.Reader.
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// This can be very slow and memory consuming for huge content.
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func (b *Blob) Data() (io.Reader, error) {
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stdout := new(bytes.Buffer)
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stderr := new(bytes.Buffer)
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// Preallocate memory to save ~50% memory usage on big files.
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stdout.Grow(int(b.Size() + 2048))
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if err := b.DataPipeline(stdout, stderr); err != nil {
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return nil, concatenateError(err, stderr.String())
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}
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return stdout, nil
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}
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// DataPipeline gets content of blob and write the result or error to stdout or stderr
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func (b *Blob) DataPipeline(stdout, stderr io.Writer) error {
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return NewCommand("show", b.ID.String()).RunInDirPipeline(b.repo.Path, stdout, stderr)
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}
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type cmdReadCloser struct {
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cmd *exec.Cmd
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stdout io.Reader
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}
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func (c cmdReadCloser) Read(p []byte) (int, error) {
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return c.stdout.Read(p)
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}
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func (c cmdReadCloser) Close() error {
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io.Copy(ioutil.Discard, c.stdout)
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return c.cmd.Wait()
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}
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// DataAsync gets a ReadCloser for the contents of a blob without reading it all.
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// Calling the Close function on the result will discard all unread output.
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func (b *Blob) DataAsync() (io.ReadCloser, error) {
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cmd := exec.Command("git", "show", b.ID.String())
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cmd.Dir = b.repo.Path
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cmd.Stderr = os.Stderr
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return nil, fmt.Errorf("StdoutPipe: %v", err)
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}
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if err = cmd.Start(); err != nil {
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return nil, fmt.Errorf("Start: %v", err)
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}
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return cmdReadCloser{stdout: stdout, cmd: cmd}, nil
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}
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