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forgejo/modules/git/blame.go
zeripath 60c5339042 Graceful: Cancel Process on monitor pages & HammerTime (#9213)
* Graceful: Create callbacks to with contexts

* Graceful: Say when Gitea is completely finished

* Graceful: Git and Process within HammerTime

Force all git commands to terminate at HammerTime
Force all process commands to terminate at HammerTime
Move almost all git processes to run as git Commands

* Graceful: Always Hammer after Shutdown

* ProcessManager: Add cancel functionality

* Fix tests

* Make sure that process.Manager.Kill() cancels

* Make threadsafe access to Processes and remove own unused Kill

* Remove cmd from the process manager as it is no longer used

* the default context is the correct context

* get rid of double till
2019-11-30 16:40:22 +02:00

132 lines
2.7 KiB
Go

// Copyright 2019 The Gitea 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 (
"bufio"
"context"
"fmt"
"io"
"os"
"os/exec"
"regexp"
"code.gitea.io/gitea/modules/process"
)
// BlamePart represents block of blame - continuous lines with one sha
type BlamePart struct {
Sha string
Lines []string
}
// BlameReader returns part of file blame one by one
type BlameReader struct {
cmd *exec.Cmd
pid int64
output io.ReadCloser
scanner *bufio.Scanner
lastSha *string
cancel context.CancelFunc
}
var shaLineRegex = regexp.MustCompile("^([a-z0-9]{40})")
// NextPart returns next part of blame (sequencial code lines with the same commit)
func (r *BlameReader) NextPart() (*BlamePart, error) {
var blamePart *BlamePart
scanner := r.scanner
if r.lastSha != nil {
blamePart = &BlamePart{*r.lastSha, make([]string, 0)}
}
for scanner.Scan() {
line := scanner.Text()
// Skip empty lines
if len(line) == 0 {
continue
}
lines := shaLineRegex.FindStringSubmatch(line)
if lines != nil {
sha1 := lines[1]
if blamePart == nil {
blamePart = &BlamePart{sha1, make([]string, 0)}
}
if blamePart.Sha != sha1 {
r.lastSha = &sha1
return blamePart, nil
}
} else if line[0] == '\t' {
code := line[1:]
blamePart.Lines = append(blamePart.Lines, code)
}
}
r.lastSha = nil
return blamePart, nil
}
// Close BlameReader - don't run NextPart after invoking that
func (r *BlameReader) Close() error {
defer process.GetManager().Remove(r.pid)
defer r.cancel()
if err := r.cmd.Wait(); err != nil {
return fmt.Errorf("Wait: %v", err)
}
return nil
}
// CreateBlameReader creates reader for given repository, commit and file
func CreateBlameReader(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)
}
func createBlameReader(dir string, command ...string) (*BlameReader, error) {
// FIXME: graceful: This should have a timeout
ctx, cancel := context.WithCancel(DefaultContext)
cmd := exec.CommandContext(ctx, command[0], command[1:]...)
cmd.Dir = dir
cmd.Stderr = os.Stderr
stdout, err := cmd.StdoutPipe()
if err != nil {
defer cancel()
return nil, fmt.Errorf("StdoutPipe: %v", err)
}
if err = cmd.Start(); err != nil {
defer cancel()
return nil, fmt.Errorf("Start: %v", err)
}
pid := process.GetManager().Add(fmt.Sprintf("GetBlame [repo_path: %s]", dir), cancel)
scanner := bufio.NewScanner(stdout)
return &BlameReader{
cmd,
pid,
stdout,
scanner,
nil,
cancel,
}, nil
}