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use chrono::TimeDelta;
use itertools::Itertools;
use sqlx::sqlite::SqlitePool;
use super::{repo::Provider as _, Channel, History, Id};
use crate::{
clock::DateTime,
db::{Duplicate as _, NotFound as _},
event::{repo::Provider as _, Broadcaster, Event, Sequence},
message::repo::Provider as _,
};
pub struct Channels<'a> {
db: &'a SqlitePool,
events: &'a Broadcaster,
}
impl<'a> Channels<'a> {
pub const fn new(db: &'a SqlitePool, events: &'a Broadcaster) -> Self {
Self { db, events }
}
pub async fn create(&self, name: &str, created_at: &DateTime) -> Result<Channel, CreateError> {
let mut tx = self.db.begin().await?;
let created = tx.sequence().next(created_at).await?;
let channel = tx
.channels()
.create(name, &created)
.await
.duplicate(|| CreateError::DuplicateName(name.into()))?;
tx.commit().await?;
self.events
.broadcast(channel.events().map(Event::from).collect::<Vec<_>>());
Ok(channel.as_created())
}
// This function is careless with respect to time, and gets you the channel as
// it exists in the specific moment when you call it.
pub async fn get(&self, channel: &Id) -> Result<Option<Channel>, sqlx::Error> {
let mut tx = self.db.begin().await?;
let channel = tx.channels().by_id(channel).await.optional()?;
tx.commit().await?;
Ok(channel.iter().flat_map(History::events).collect())
}
pub async fn delete(&self, channel: &Id, deleted_at: &DateTime) -> Result<(), Error> {
let mut tx = self.db.begin().await?;
let channel = tx
.channels()
.by_id(channel)
.await
.not_found(|| Error::NotFound(channel.clone()))?;
let mut events = Vec::new();
let messages = tx.messages().in_channel(&channel, None).await?;
for message in messages {
let deleted = tx.sequence().next(deleted_at).await?;
let message = tx.messages().delete(message.id(), &deleted).await?;
events.extend(
message
.events()
.filter(Sequence::start_from(deleted.sequence))
.map(Event::from),
);
}
let deleted = tx.sequence().next(deleted_at).await?;
let channel = tx.channels().delete(channel.id(), &deleted).await?;
events.extend(
channel
.events()
.filter(Sequence::start_from(deleted.sequence))
.map(Event::from),
);
tx.commit().await?;
self.events.broadcast(events);
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.channels().expired(&expire_at).await?;
let mut events = Vec::with_capacity(expired.len());
for channel in expired {
let deleted = tx.sequence().next(relative_to).await?;
let channel = tx.channels().delete(&channel, &deleted).await?;
events.push(
channel
.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 CreateError {
#[error("channel named {0} already exists")]
DuplicateName(String),
#[error(transparent)]
Database(#[from] sqlx::Error),
}
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error("channel {0} not found")]
NotFound(Id),
#[error(transparent)]
Database(#[from] sqlx::Error),
}
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