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use itertools::Itertools as _;
use sqlx::sqlite::SqlitePool;
use super::Snapshot;
use crate::{
conversation::{self, repo::Provider as _},
db::{self, NotFound as _},
error::failed::{Failed, ResultExt as _},
event::{Event, Sequence, repo::Provider as _},
message::{self, repo::Provider as _},
user::{self, repo::Provider as _},
vapid::{self, repo::Provider as _},
};
pub struct Boot {
db: SqlitePool,
}
impl Boot {
pub const fn new(db: SqlitePool) -> Self {
Self { db }
}
pub async fn snapshot(&self) -> Result<Snapshot, Failed> {
let mut tx = self.db.begin().await.fail(db::failed::BEGIN)?;
let resume_point = tx
.sequence()
.current()
.await
.fail("Failed to load resume point")?;
let users = tx
.users()
.all(resume_point)
.await
.fail("Failed to load user events")?;
let conversations = tx
.conversations()
.all(resume_point)
.await
.fail("Failed to load conversation events")?;
let messages = tx
.messages()
.all(resume_point)
.await
.fail("Failed to load message events")?;
let vapid = tx
.vapid()
.current()
.await
.optional()
.fail("Failed to load VAPID key events")?;
tx.commit().await.fail(db::failed::COMMIT)?;
let user_events = users
.iter()
.map(user::History::events)
.kmerge_by(Sequence::merge)
.filter(Sequence::up_to(resume_point))
.map(Event::from);
let conversation_events = conversations
.iter()
.map(conversation::History::events)
.kmerge_by(Sequence::merge)
.filter(Sequence::up_to(resume_point))
.map(Event::from);
let message_events = messages
.iter()
.map(message::History::events)
.kmerge_by(Sequence::merge)
.filter(Sequence::up_to(resume_point))
.map(Event::from);
let vapid_events = vapid
.iter()
.flat_map(vapid::History::events)
.filter(Sequence::up_to(resume_point))
.map(Event::from);
let events = user_events
.merge_by(conversation_events, Sequence::merge)
.merge_by(message_events, Sequence::merge)
.merge_by(vapid_events, Sequence::merge)
.collect();
Ok(Snapshot {
resume_point,
events,
})
}
}
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