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refactor(imap): move prefetch_existing_msgs to Session

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link2xt
2024-02-28 21:49:44 +00:00
parent d4a505b52e
commit d2e86c5852
2 changed files with 27 additions and 28 deletions
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28
src/imap.rs
View File

@@ -1420,34 +1420,6 @@ impl Imap {
Ok(msgs.into_iter().map(|((_, uid), msg)| (uid, msg)).collect())
}
/// Like fetch_after(), but not for new messages but existing ones (the DC_FETCH_EXISTING_MSGS_COUNT newest messages)
async fn prefetch_existing_msgs(&mut self) -> Result<Vec<(u32, async_imap::types::Fetch)>> {
let session = self.session.as_mut().context("no IMAP session")?;
let exists: i64 = {
let mailbox = session.selected_mailbox.as_ref().context("no mailbox")?;
mailbox.exists.into()
};
// Fetch last DC_FETCH_EXISTING_MSGS_COUNT (100) messages.
// Sequence numbers are sequential. If there are 1000 messages in the inbox,
// we can fetch the sequence numbers 900-1000 and get the last 100 messages.
let first = cmp::max(1, exists - DC_FETCH_EXISTING_MSGS_COUNT + 1);
let set = format!("{first}:{exists}");
let mut list = session
.fetch(&set, PREFETCH_FLAGS)
.await
.context("IMAP Could not fetch")?;
let mut msgs = BTreeMap::new();
while let Some(msg) = list.try_next().await? {
if let Some(msg_uid) = msg.uid {
msgs.insert((msg.internal_date(), msg_uid), msg);
}
}
Ok(msgs.into_iter().map(|((_, uid), msg)| (uid, msg)).collect())
}
/// Fetches a list of messages by server UID.
///
/// Returns the last UID fetched successfully and the info about each downloaded message.

27
src/imap/session.rs
View File

@@ -76,4 +76,31 @@ impl Session {
let list = self.list(Some(""), Some("*")).await?.try_collect().await?;
Ok(list)
}
/// Like fetch_after(), but not for new messages but existing ones (the DC_FETCH_EXISTING_MSGS_COUNT newest messages)
async fn prefetch_existing_msgs(&mut self) -> Result<Vec<(u32, async_imap::types::Fetch)>> {
let exists: i64 = {
let mailbox = self.selected_mailbox.as_ref().context("no mailbox")?;
mailbox.exists.into()
};
// Fetch last DC_FETCH_EXISTING_MSGS_COUNT (100) messages.
// Sequence numbers are sequential. If there are 1000 messages in the inbox,
// we can fetch the sequence numbers 900-1000 and get the last 100 messages.
let first = cmp::max(1, exists - DC_FETCH_EXISTING_MSGS_COUNT + 1);
let set = format!("{first}:{exists}");
let mut list = self
.fetch(&set, PREFETCH_FLAGS)
.await
.context("IMAP Could not fetch")?;
let mut msgs = BTreeMap::new();
while let Some(msg) = list.try_next().await? {
if let Some(msg_uid) = msg.uid {
msgs.insert((msg.internal_date(), msg_uid), msg);
}
}
Ok(msgs.into_iter().map(|((_, uid), msg)| (uid, msg)).collect())
}
}