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use itertools::Itertools as _;
use sqlx::sqlite::SqlitePool;
use super::Snapshot;
use crate::{
conversation::{self, repo::Provider as _},
event::{Event, Sequence, repo::Provider as _},
message::{self, repo::Provider as _},
name,
user::{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, Error> {
let mut tx = self.db.begin().await?;
let resume_point = tx.sequence().current().await?;
let users = tx.users().all(resume_point).await?;
let conversations = tx.conversations().all(resume_point).await?;
let messages = tx.messages().all(resume_point).await?;
tx.commit().await?;
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 events = user_events
.merge_by(conversation_events, Sequence::merge)
.merge_by(message_events, Sequence::merge)
.collect();
Ok(Snapshot {
resume_point,
events,
})
}
}
#[derive(Debug, thiserror::Error)]
#[error(transparent)]
pub enum Error {
Name(#[from] name::Error),
Database(#[from] sqlx::Error),
}
impl From<user::repo::LoadError> for Error {
fn from(error: user::repo::LoadError) -> Self {
use user::repo::LoadError;
match error {
LoadError::Name(error) => error.into(),
LoadError::Database(error) => error.into(),
}
}
}
impl From<conversation::repo::LoadError> for Error {
fn from(error: conversation::repo::LoadError) -> Self {
use conversation::repo::LoadError;
match error {
LoadError::Name(error) => error.into(),
LoadError::Database(error) => error.into(),
}
}
}
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