forked from Shiloh/githaven
e65cfabda7
Breaking the pipe is a valid way of killing a piped command and any error from a broken cat-file batch command should be passed back up to the writer any way therefore specifically logging it is unnecessary. Signed-off-by: Andrew Thornton <art27@cantab.net>
77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
// Copyright 2020 The Gitea 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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// +build !gogit
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package git
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import (
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"bufio"
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"io"
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"strconv"
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"strings"
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)
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// Blob represents a Git object.
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type Blob struct {
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ID SHA1
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gotSize bool
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size int64
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repoPath string
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name string
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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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stdoutReader, stdoutWriter := io.Pipe()
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go func() {
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stderr := &strings.Builder{}
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err := NewCommand("cat-file", "--batch").RunInDirFullPipeline(b.repoPath, stdoutWriter, stderr, strings.NewReader(b.ID.String()+"\n"))
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if err != nil {
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err = ConcatenateError(err, stderr.String())
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_ = stdoutWriter.CloseWithError(err)
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} else {
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_ = stdoutWriter.Close()
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}
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}()
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bufReader := bufio.NewReader(stdoutReader)
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_, _, size, err := ReadBatchLine(bufReader)
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if err != nil {
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stdoutReader.Close()
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return nil, err
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}
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return &LimitedReaderCloser{
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R: bufReader,
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C: stdoutReader,
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N: size,
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}, nil
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}
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// Size returns the uncompressed size of the blob
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func (b *Blob) Size() int64 {
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if b.gotSize {
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return b.size
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}
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size, err := NewCommand("cat-file", "-s", b.ID.String()).RunInDir(b.repoPath)
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if err != nil {
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log("error whilst reading size for %s in %s. Error: %v", b.ID.String(), b.repoPath, err)
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return 0
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}
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b.size, err = strconv.ParseInt(size[:len(size)-1], 10, 64)
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if err != nil {
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log("error whilst parsing size %s for %s in %s. Error: %v", size, b.ID.String(), b.repoPath, err)
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return 0
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}
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b.gotSize = true
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return b.size
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}
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