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Add imap table to keep track of message UIDs

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`imap` table maps Message-IDs to UIDs on the server. `dc_receive_imf`
no longer gets the UID of the message as an argument and does not
insert the folder and UID of the message into the `msgs`
table. `server_folder` and `server_uid` columns in `msgs` table are
deprecated.

MoveMsg and DeleteMsgOnImap jobs are removed. Now messages are moved
and deleted only in the `fetch_move_delete` procedure that consults
the `target` column of the `imap` table to determine where the message
should go.

Where the message should go is determined after prefetching by the
`imap::target_folder()` procedure.  Messages are only downloaded once
they reach their target folder to avoid race conditions in multidevice
setting, such as:

1. One device trying to FETCH the message while the other tries to
MOVE it.

2. One device marking the message as \Seen in the Inbox while the
other has already copied unseen message to the Movebox and is going to
delete the \Seen message in the Inbox.

3. Device downloads the message from the Inbox while there are newer
messages in the Movebox placed there by the other device, thus
processing the messages out of order.
This commit is contained in:
link2xt
2021-12-19 00:00:00 +00:00
parent 0b810d7d65
commit 12823c2213
22 changed files with 1057 additions and 1329 deletions
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34
src/sql/migrations.rs
View File

@@ -502,6 +502,40 @@ item TEXT DEFAULT '');"#,
sql.execute_migration("ALTER TABLE msgs ADD COLUMN hop_info TEXT;", 81)
.await?;
}
if dbversion < 82 {
info!(context, "[migration] v82");
sql.execute_migration(
r#"CREATE TABLE imap (
id INTEGER PRIMARY KEY AUTOINCREMENT,
rfc724_mid TEXT DEFAULT '', -- Message-ID header
folder TEXT DEFAULT '', -- IMAP folder
target TEXT DEFAULT '', -- Destination folder, empty to delete.
uid INTEGER DEFAULT 0, -- UID
uidvalidity INTEGER DEFAULT 0,
UNIQUE (folder, uid, uidvalidity)
);
CREATE INDEX imap_folder ON imap(folder);
CREATE INDEX imap_messageid ON imap(rfc724_mid);
INSERT INTO imap
(rfc724_mid, folder, target, uid, uidvalidity)
SELECT
rfc724_mid,
server_folder AS folder,
server_folder AS target,
server_uid AS uid,
(SELECT uidvalidity FROM imap_sync WHERE folder=server_folder) AS uidvalidity
FROM msgs
WHERE server_uid>0
ON CONFLICT (folder, uid, uidvalidity)
DO UPDATE SET rfc724_mid=excluded.rfc724_mid,
target=excluded.target;
"#,
82,
)
.await?;
}
Ok((
recalc_fingerprints,
update_icons,