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queue: Sync the files written on Put

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When we put something in the queue and respond "250 ok" to the client,
that is taken as accepting the email.

As part of putting something in the queue, we write it to disk, but
today we don't do an fsync on that file.

That leaves a gap where a badly timed crash on some systems could lead
to the file being empty, causing us to lose an email that we accepted.

To elliminate (or drastically reduce on some filesystems) the chances of
that situation, we call fsync on the file that gets written when we put
something in the queue.

Thanks to nolanl@github for reporting this in
https://github.com/albertito/chasquid/issues/78.
This commit is contained in:
Alberto Bertogli
2025-10-18 12:10:24 +01:00
parent 7d56f1b4b4
commit 08273ea901
4 changed files with 55 additions and 5 deletions
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8
internal/protoio/protoio.go
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@@ -33,13 +33,13 @@ func ReadTextMessage(fname string, pb proto.Message) error {
}
// WriteMessage marshals pb and atomically writes it into fname.
func WriteMessage(fname string, pb proto.Message, perm os.FileMode) error {
func WriteMessage(fname string, pb proto.Message, perm os.FileMode, ops ...safeio.FileOp) error {
out, err := proto.Marshal(pb)
if err != nil {
return err
}
return safeio.WriteFile(fname, out, perm)
return safeio.WriteFile(fname, out, perm, ops...)
}
var textOpts = prototext.MarshalOptions{
@@ -48,12 +48,12 @@ var textOpts = prototext.MarshalOptions{
// WriteTextMessage marshals pb in text format and atomically writes it into
// fname.
func WriteTextMessage(fname string, pb proto.Message, perm os.FileMode) error {
func WriteTextMessage(fname string, pb proto.Message, perm os.FileMode, ops ...safeio.FileOp) error {
out, err := textOpts.Marshal(pb)
if err != nil {
return err
}
return safeio.WriteFile(fname, out, perm)
return safeio.WriteFile(fname, out, perm, ops...)
}
///////////////////////////////////////////////////////////////