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add condstore & qresync imap extensions

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for conditional storing and quick resynchronisation (not sure if mail clients are actually using it that).

each message now has a "modseq". it is increased for each change. with
condstore, imap clients can request changes since a certain modseq. that
already allows quickly finding changes since a previous connection. condstore
also allows storing (e.g. setting new message flags) only when the modseq of a
message hasn't changed.

qresync should make it fast for clients to get a full list of changed messages
for a mailbox, including removals.

we now also keep basic metadata of messages that have been removed (expunged).
just enough (uid, modseq) to tell client that the messages have been removed.
this does mean we have to be careful when querying messages from the database.
we must now often filter the expunged messages out.

we also keep "createseq", the modseq when a message was created. this will be
useful for the jmap implementation.
This commit is contained in:
Mechiel Lukkien
2023-07-24 21:21:05 +02:00
parent cc4ecf2927
commit 7f1b7198a8
30 changed files with 2181 additions and 221 deletions
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12
import.go
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@ -270,6 +270,8 @@ func importctl(ctx context.Context, ctl *ctl, mbox bool) {
var changes []store.Change
var modseq store.ModSeq // Assigned on first delivered messages, used for all messages.
xdeliver := func(m *store.Message, mf *os.File) {
// todo: possibly set dmarcdomain to the domain of the from address? at least for non-spams that have been seen. otherwise user would start without any reputations. the assumption would be that the user has accepted email and deemed it legit, coming from the indicated sender.
@ -281,7 +283,7 @@ func importctl(ctx context.Context, ctl *ctl, mbox bool) {
ctl.xcheck(err, "delivering message")
deliveredIDs = append(deliveredIDs, m.ID)
ctl.log.Debug("delivered message", mlog.Field("id", m.ID))
changes = append(changes, store.ChangeAddUID{MailboxID: m.MailboxID, UID: m.UID, Flags: m.Flags, Keywords: m.Keywords})
changes = append(changes, store.ChangeAddUID{MailboxID: m.MailboxID, UID: m.UID, ModSeq: modseq, Flags: m.Flags, Keywords: m.Keywords})
}
// todo: one goroutine for reading messages, one for parsing the message, one adding to database, one for junk filter training.
@ -353,8 +355,16 @@ func importctl(ctx context.Context, ctl *ctl, mbox bool) {
}
}
if modseq == 0 {
var err error
modseq, err = a.NextModSeq(tx)
ctl.xcheck(err, "assigning next modseq")
}
m.MailboxID = mb.ID
m.MailboxOrigID = mb.ID
m.CreateSeq = modseq
m.ModSeq = modseq
xdeliver(m, msgf)
err = msgf.Close()
ctl.log.Check(err, "closing message after delivery")