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Ensure BlameReaders close at end of request (#12102) (#12103)

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Backport #12102

this was thought to be due to timeouts, however on closer look this
appears to be due to the Close() function of the BlameReader hanging
with a blocked stdout pipe.

This PR fixes this Close function to:

* Cancel the context of the cmd
* Close the StdoutReader - ensuring that the output pipe is closed

Further it makes the context of the `git blame` command a child of the
request context - ensuring that even if Close() is not called, on
cancellation of the Request the blame is command will also be cancelled.

Fixes #11716
Closes #11727

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2020-07-01 16:43:25 +01:00 committed by GitHub
parent df13fc8818
commit 20c2bdf86b
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 19 additions and 8 deletions
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14
modules/git/blame.go
View File

@ -79,7 +79,9 @@ func (r *BlameReader) NextPart() (*BlamePart, error) {
// Close BlameReader - don't run NextPart after invoking that
func (r *BlameReader) Close() error {
defer process.GetManager().Remove(r.pid)
defer r.cancel()
r.cancel()
_ = r.output.Close()
if err := r.cmd.Wait(); err != nil {
return fmt.Errorf("Wait: %v", err)
@ -89,19 +91,19 @@ func (r *BlameReader) Close() error {
}
// CreateBlameReader creates reader for given repository, commit and file
func CreateBlameReader(repoPath, commitID, file string) (*BlameReader, error) {
func CreateBlameReader(ctx context.Context, repoPath, commitID, file string) (*BlameReader, error) {
gitRepo, err := OpenRepository(repoPath)
if err != nil {
return nil, err
}
gitRepo.Close()
return createBlameReader(repoPath, GitExecutable, "blame", commitID, "--porcelain", "--", file)
return createBlameReader(ctx, repoPath, GitExecutable, "blame", commitID, "--porcelain", "--", file)
}
func createBlameReader(dir string, command ...string) (*BlameReader, error) {
// FIXME: graceful: This should have a timeout
ctx, cancel := context.WithCancel(DefaultContext)
func createBlameReader(ctx context.Context, dir string, command ...string) (*BlameReader, error) {
// Here we use the provided context - this should be tied to the request performing the blame so that it does not hang around.
ctx, cancel := context.WithCancel(ctx)
cmd := exec.CommandContext(ctx, command[0], command[1:]...)
cmd.Dir = dir
cmd.Stderr = os.Stderr

5
modules/git/blame_test.go
View File

@ -5,6 +5,7 @@
package git
import (
"context"
"io/ioutil"
"testing"
@ -93,8 +94,10 @@ func TestReadingBlameOutput(t *testing.T) {
if _, err = tempFile.WriteString(exampleBlame); err != nil {
panic(err)
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
blameReader, err := createBlameReader("", "cat", tempFile.Name())
blameReader, err := createBlameReader(ctx, "", "cat", tempFile.Name())
if err != nil {
panic(err)
}

8
routers/repo/blame.go
View File

@ -141,7 +141,13 @@ func RefBlame(ctx *context.Context) {
ctx.Data["FileSize"] = blob.Size()
ctx.Data["FileName"] = blob.Name()
blameReader, err := git.CreateBlameReader(models.RepoPath(userName, repoName), commitID, fileName)
ctx.Data["NumLines"], err = blob.GetBlobLineCount()
if err != nil {
ctx.NotFound("GetBlobLineCount", err)
return
}
blameReader, err := git.CreateBlameReader(ctx.Req.Context(), models.RepoPath(userName, repoName), commitID, fileName)
if err != nil {
ctx.NotFound("CreateBlameReader", err)
return