1use super::*;
 2
 3impl Database {
 4    pub async fn create_server(&self, environment: &str) -> Result<ServerId> {
 5        self.transaction(|tx| async move {
 6            let server = server::ActiveModel {
 7                environment: ActiveValue::set(environment.into()),
 8                ..Default::default()
 9            }
10            .insert(&*tx)
11            .await?;
12            Ok(server.id)
13        })
14        .await
15    }
16
17    pub async fn stale_room_ids(
18        &self,
19        environment: &str,
20        new_server_id: ServerId,
21    ) -> Result<Vec<RoomId>> {
22        self.transaction(|tx| async move {
23            #[derive(Copy, Clone, Debug, EnumIter, DeriveColumn)]
24            enum QueryAs {
25                RoomId,
26            }
27
28            let stale_server_epochs = self
29                .stale_server_ids(environment, new_server_id, &tx)
30                .await?;
31            Ok(room_participant::Entity::find()
32                .select_only()
33                .column(room_participant::Column::RoomId)
34                .distinct()
35                .filter(
36                    room_participant::Column::AnsweringConnectionServerId
37                        .is_in(stale_server_epochs),
38                )
39                .into_values::<_, QueryAs>()
40                .all(&*tx)
41                .await?)
42        })
43        .await
44    }
45
46    pub async fn delete_stale_servers(
47        &self,
48        environment: &str,
49        new_server_id: ServerId,
50    ) -> Result<()> {
51        self.transaction(|tx| async move {
52            server::Entity::delete_many()
53                .filter(
54                    Condition::all()
55                        .add(server::Column::Environment.eq(environment))
56                        .add(server::Column::Id.ne(new_server_id)),
57                )
58                .exec(&*tx)
59                .await?;
60            Ok(())
61        })
62        .await
63    }
64
65    async fn stale_server_ids(
66        &self,
67        environment: &str,
68        new_server_id: ServerId,
69        tx: &DatabaseTransaction,
70    ) -> Result<Vec<ServerId>> {
71        let stale_servers = server::Entity::find()
72            .filter(
73                Condition::all()
74                    .add(server::Column::Environment.eq(environment))
75                    .add(server::Column::Id.ne(new_server_id)),
76            )
77            .all(&*tx)
78            .await?;
79        Ok(stale_servers.into_iter().map(|server| server.id).collect())
80    }
81}