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use chrono::TimeDelta;
use itertools::Itertools;
use sqlx::sqlite::SqlitePool;
use super::{repo::Provider as _, Message};
use crate::{
channel::{self, repo::Provider as _},
clock::DateTime,
db::NotFound as _,
event::{broadcaster::Broadcaster, repo::Provider as _, Sequence},
login::Login,
};
pub struct Messages<'a> {
db: &'a SqlitePool,
events: &'a Broadcaster,
}
impl<'a> Messages<'a> {
pub const fn new(db: &'a SqlitePool, events: &'a Broadcaster) -> Self {
Self { db, events }
}
pub async fn send(
&self,
channel: &channel::Id,
sender: &Login,
sent_at: &DateTime,
body: &str,
) -> Result<Message, Error> {
let mut tx = self.db.begin().await?;
let channel = tx
.channels()
.by_id(channel)
.await
.not_found(|| Error::ChannelNotFound(channel.clone()))?;
let sent = tx.sequence().next(sent_at).await?;
let message = tx
.messages()
.create(&channel.snapshot(), sender, &sent, body)
.await?;
tx.commit().await?;
for event in message.events() {
self.events.broadcast(event);
}
Ok(message.snapshot())
}
pub async fn expire(&self, relative_to: &DateTime) -> Result<(), sqlx::Error> {
// Somewhat arbitrarily, expire after 90 days.
let expire_at = relative_to.to_owned() - TimeDelta::days(90);
let mut tx = self.db.begin().await?;
let expired = tx.messages().expired(&expire_at).await?;
let mut events = Vec::with_capacity(expired.len());
for (channel, message) in expired {
let deleted = tx.sequence().next(relative_to).await?;
let message = tx.messages().delete(&channel, &message, &deleted).await?;
events.push(
message
.events()
.filter(Sequence::start_from(deleted.sequence)),
);
}
tx.commit().await?;
for event in events
.into_iter()
.kmerge_by(|a, b| a.instant.sequence < b.instant.sequence)
{
self.events.broadcast(event);
}
Ok(())
}
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("channel {0} not found")]
ChannelNotFound(channel::Id),
#[error(transparent)]
DatabaseError(#[from] sqlx::Error),
}
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