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-rw-r--r--aero-collections/mail/snapshot.rs60
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diff --git a/aero-collections/mail/snapshot.rs b/aero-collections/mail/snapshot.rs
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+use std::sync::Arc;
+
+use anyhow::Result;
+
+use super::mailbox::Mailbox;
+use super::query::{Query, QueryScope};
+use super::uidindex::UidIndex;
+use super::unique_ident::UniqueIdent;
+
+/// A Frozen Mailbox has a snapshot of the current mailbox
+/// state that is desynchronized with the real mailbox state.
+/// It's up to the user to choose when their snapshot must be updated
+/// to give useful information to their clients
+pub struct FrozenMailbox {
+ pub mailbox: Arc<Mailbox>,
+ pub snapshot: UidIndex,
+}
+
+impl FrozenMailbox {
+ /// Create a snapshot from a mailbox, the mailbox + the snapshot
+ /// becomes the "Frozen Mailbox".
+ pub async fn new(mailbox: Arc<Mailbox>) -> Self {
+ let state = mailbox.current_uid_index().await;
+
+ Self {
+ mailbox,
+ snapshot: state,
+ }
+ }
+
+ /// Force the synchronization of the inner mailbox
+ /// but do not update the local snapshot
+ pub async fn sync(&self) -> Result<()> {
+ self.mailbox.opportunistic_sync().await
+ }
+
+ /// Peek snapshot without updating the frozen mailbox
+ /// Can be useful if you want to plan some writes
+ /// while sending a diff to the client later
+ pub async fn peek(&self) -> UidIndex {
+ self.mailbox.current_uid_index().await
+ }
+
+ /// Update the FrozenMailbox local snapshot.
+ /// Returns the old snapshot, so you can build a diff
+ pub async fn update(&mut self) -> UidIndex {
+ let old_snapshot = self.snapshot.clone();
+ self.snapshot = self.mailbox.current_uid_index().await;
+
+ old_snapshot
+ }
+
+ pub fn query<'a, 'b>(&'a self, uuids: &'b [UniqueIdent], scope: QueryScope) -> Query<'a, 'b> {
+ Query {
+ frozen: self,
+ emails: uuids,
+ scope,
+ }
+ }
+}