Make Requests Processes and create process hierarchy. Associate OpenRepository with context. (#17125)

This PR registers requests with the process manager and manages hierarchy within the processes.

Git repos are then associated with a context, (usually the request's context) - with sub commands using this context as their base context.

Signed-off-by: Andrew Thornton <art27@cantab.net>

services/mailer/mailer.go

@@ -7,7 +7,6 @@ package mailer
 
 import (
 	"bytes"
-	"context"
 	"crypto/tls"
 	"fmt"
 	"io"
@@ -258,11 +257,10 @@ func (s *sendmailSender) Send(from string, to []string, msg io.WriterTo) error {
 	args = append(args, to...)
 	log.Trace("Sending with: %s %v", setting.MailService.SendmailPath, args)
 
-	pm := process.GetManager()
 	desc := fmt.Sprintf("SendMail: %s %v", setting.MailService.SendmailPath, args)
 
-	ctx, cancel := context.WithTimeout(graceful.GetManager().HammerContext(), setting.MailService.SendmailTimeout)
-	defer cancel()
+	ctx, _, finished := process.GetManager().AddContextTimeout(graceful.GetManager().HammerContext(), setting.MailService.SendmailTimeout, desc)
+	defer finished()
 
 	cmd := exec.CommandContext(ctx, setting.MailService.SendmailPath, args...)
 	pipe, err := cmd.StdinPipe()
@@ -272,18 +270,17 @@ func (s *sendmailSender) Send(from string, to []string, msg io.WriterTo) error {
 	}
 
 	if err = cmd.Start(); err != nil {
+		_ = pipe.Close()
 		return err
 	}
 
-	pid := pm.Add(desc, cancel)
-
 	_, err = msg.WriteTo(pipe)
 
 	// we MUST close the pipe or sendmail will hang waiting for more of the message
 	// Also we should wait on our sendmail command even if something fails
 	closeError = pipe.Close()
 	waitError = cmd.Wait()
-	pm.Remove(pid)
+
 	if err != nil {
 		return err
 	} else if closeError != nil {