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Improve expunged message/UID tracking in IMAP sessions, track synchronization history for mailboxes/annotations.

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Keeping the message files around, and the message details in the database, is
useful for IMAP sessions that haven't seen/processed the removal of a message
yet and try to fetch it. Before, we would return errors. Similarly, a session
that has a mailbox selected that is removed can (at least in theory) still read
messages.

The mechanics to do this need keeping removed mailboxes around too. JMAP needs
that anyway, so we now keep modseq/createseq/expunged history for mailboxes
too. And while we're at it, for annotations as well.

For future JMAP support, we now also keep the mailbox parent id around for a
mailbox, with an upgrade step to set the field for existing mailboxes and
fixing up potential missing parents (which could possibly have happened in an
obscure corner case that I doubt anyone ran into).
This commit is contained in:
Mechiel Lukkien
2025-03-05 17:17:57 +01:00
parent 684c716e4d
commit 577944310c
63 changed files with 1945 additions and 1249 deletions
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42
imapserver/metadata.go
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@ -100,7 +100,7 @@ func (c *conn) cmdGetmetadata(tag, cmd string, p *parser) {
mb := c.xmailbox(tx, mailboxName, "TRYCREATE")
q.FilterNonzero(store.Annotation{MailboxID: mb.ID})
}
q.FilterEqual("Expunged", false)
q.SortAsc("MailboxID", "Key") // For tests.
err := q.ForEach(func(a store.Annotation) error {
// ../rfc/5464:516
@ -246,41 +246,35 @@ func (c *conn) cmdSetmetadata(tag, cmd string, p *parser) {
q := bstore.QueryTx[store.Annotation](tx)
q.FilterNonzero(store.Annotation{Key: a.Key})
q.FilterEqual("MailboxID", mb.ID) // Can be zero.
q.FilterEqual("Expunged", false)
oa, err := q.Get()
// Nil means remove. ../rfc/5464:579
if a.Value == nil {
var deleted []store.Annotation
q.Gather(&deleted)
_, err := q.Delete()
xcheckf(err, "deleting annotation")
for _, oa := range deleted {
changes = append(changes, oa.Change(mailboxName))
}
if err == bstore.ErrAbsent && a.Value == nil {
continue
}
if modseq == 0 {
var err error
modseq, err = c.account.NextModSeq(tx)
xcheckf(err, "get next modseq")
}
a.MailboxID = mb.ID
a.ModSeq = modseq
a.CreateSeq = modseq
oa, err := q.Get()
if err == bstore.ErrAbsent {
a.MailboxID = mb.ID
a.CreateSeq = modseq
a.ModSeq = modseq
err = tx.Insert(&a)
xcheckf(err, "inserting annotation")
changes = append(changes, a.Change(mailboxName))
continue
} else {
xcheckf(err, "get metadata")
oa.ModSeq = modseq
if a.Value == nil {
oa.Expunged = true
}
oa.IsString = a.IsString
oa.Value = a.Value
err = tx.Update(&oa)
xcheckf(err, "updating metdata")
}
xcheckf(err, "looking up existing annotation for entry name")
changes = append(changes, a.Change(mailboxName))
oa.Value = a.Value
err = tx.Update(&oa)
xcheckf(err, "updating metadata annotation")
}
c.xcheckMetadataSize(tx)
@ -304,7 +298,7 @@ func (c *conn) xcheckMetadataSize(tx *bstore.Tx) {
// ../rfc/5464:383
var n int
var size int
err := bstore.QueryTx[store.Annotation](tx).ForEach(func(a store.Annotation) error {
err := bstore.QueryTx[store.Annotation](tx).FilterEqual("Expunged", false).ForEach(func(a store.Annotation) error {
n++
if n > metadataMaxKeys {
// ../rfc/5464:590