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use chrono::TimeDelta;
use itertools::Itertools;
use sqlx::sqlite::SqlitePool;
use super::{repo::Provider as _, Id, Message};
use crate::{
channel::{self, repo::Provider as _},
clock::DateTime,
db::NotFound as _,
event::{broadcaster::Broadcaster, repo::Provider as _, Event, 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, SendError> {
let mut tx = self.db.begin().await?;
let channel = tx
.channels()
.by_id(channel)
.await
.not_found(|| SendError::ChannelNotFound(channel.clone()))?;
let sent = tx.sequence().next(sent_at).await?;
let message = tx.messages().create(&channel, sender, &sent, body).await?;
tx.commit().await?;
self.events
.broadcast(message.events().map(Event::from).collect::<Vec<_>>());
Ok(message.as_sent())
}
pub async fn in_channel(
&self,
channel: &channel::Id,
resume_point: Option<Sequence>,
) -> Result<Vec<Message>, DeleteError> {
let mut tx = self.db.begin().await?;
let channel = tx
.channels()
.by_id(channel)
.await
.not_found(|| DeleteError::ChannelNotFound(channel.clone()))?;
let messages = tx.messages().in_channel(&channel, resume_point).await?;
tx.commit().await?;
let messages = messages
.into_iter()
.filter_map(|message| {
message
.events()
.filter(Sequence::up_to(resume_point))
.collect()
})
.collect();
Ok(messages)
}
pub async fn delete(&self, message: &Id, deleted_at: &DateTime) -> Result<(), DeleteError> {
let mut tx = self.db.begin().await?;
let deleted = tx.sequence().next(deleted_at).await?;
let message = tx.messages().delete(message, &deleted).await?;
tx.commit().await?;
self.events.broadcast(
message
.events()
.filter(Sequence::start_from(deleted.sequence))
.map(Event::from)
.collect::<Vec<_>>(),
);
Ok(())
}
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 message in expired {
let deleted = tx.sequence().next(relative_to).await?;
let message = tx.messages().delete(&message, &deleted).await?;
events.push(
message
.events()
.filter(Sequence::start_from(deleted.sequence)),
);
}
tx.commit().await?;
self.events.broadcast(
events
.into_iter()
.kmerge_by(Sequence::merge)
.map(Event::from)
.collect::<Vec<_>>(),
);
Ok(())
}
}
#[derive(Debug, thiserror::Error)]
pub enum SendError {
#[error("channel {0} not found")]
ChannelNotFound(channel::Id),
#[error(transparent)]
DatabaseError(#[from] sqlx::Error),
}
#[derive(Debug, thiserror::Error)]
pub enum DeleteError {
#[error("channel {0} not found")]
ChannelNotFound(channel::Id),
#[error("message {0} not found")]
NotFound(Id),
#[error(transparent)]
DatabaseError(#[from] sqlx::Error),
}
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