feat(gpodder): add paginated sessions function

gpodder/src/models.rs

@@ -65,3 +65,9 @@ pub struct Subscription {
     pub url: String,
     pub time_changed: DateTime<Utc>,
 }
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Page {
+    pub page: u32,
+    pub per_page: u32,
+}

gpodder/src/repository.rs

@@ -37,6 +37,14 @@ impl GpodderRepository {
         }
     }
 
+    pub fn paginated_sessions(
+        &self,
+        user: &models::User,
+        page: models::Page,
+    ) -> Result<Vec<models::Session>, AuthErr> {
+        self.store.paginated_sessions(user, page)
+    }
+
     pub fn get_user(&self, username: &str) -> Result<models::User, AuthErr> {
         self.store.get_user(username)?.ok_or(AuthErr::UnknownUser)
     }

gpodder/src/store.rs

@@ -38,6 +38,10 @@ pub trait AuthStore {
     /// Retrieve the session with the given session ID
     fn get_session(&self, session_id: i64) -> Result<Option<Session>, AuthErr>;
 
+    /// Retrieve a paginated list of the given user's sessions, ordered descending by the last seen
+    /// value.
+    fn paginated_sessions(&self, user: &User, page: Page) -> Result<Vec<Session>, AuthErr>;
+
     /// Retrieve the user with the given username
     fn get_user(&self, username: &str) -> Result<Option<User>, AuthErr>;
 

gpodder_sqlite/src/repository/auth.rs

@@ -114,4 +114,31 @@ impl gpodder::AuthStore for SqliteRepository {
                 .map_err(DbError::from)?,
         )
     }
+
+    fn paginated_sessions(
+        &self,
+        user: &gpodder::User,
+        page: gpodder::Page,
+    ) -> Result<Vec<gpodder::Session>, AuthErr> {
+        (|| {
+            let sessions = sessions::table
+                .filter(sessions::user_id.eq(user.id))
+                .order(sessions::last_seen.desc())
+                .offset((page.page * page.per_page) as i64)
+                .limit(page.per_page as i64)
+                .select(Session::as_select())
+                .get_results(&mut self.pool.get()?)?
+                .into_iter()
+                .map(|session| gpodder::Session {
+                    id: session.id,
+                    last_seen: DateTime::from_timestamp(session.last_seen, 0).unwrap(),
+                    user_agent: session.user_agent,
+                    user: user.clone(),
+                })
+                .collect();
+
+            Ok::<_, DbError>(sessions)
+        })()
+        .map_err(AuthErr::from)
+    }
 }