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|
use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
use crate::{
clock::DateTime,
events::types::{self, Sequence},
repo::{
channel::Channel,
login::{self, Login},
message,
},
};
pub trait Provider {
fn message_events(&mut self) -> Events;
}
impl<'c> Provider for Transaction<'c, Sqlite> {
fn message_events(&mut self) -> Events {
Events(self)
}
}
pub struct Events<'t>(&'t mut SqliteConnection);
impl<'c> Events<'c> {
pub async fn create(
&mut self,
sender: &Login,
channel: &Channel,
body: &str,
sent_at: &DateTime,
) -> Result<types::ChannelEvent, sqlx::Error> {
let sequence = self.next_sequence_for(channel).await?;
let id = message::Id::generate();
let message = sqlx::query!(
r#"
insert into message
(id, channel, sequence, sender, body, sent_at)
values ($1, $2, $3, $4, $5, $6)
returning
id as "id: message::Id",
sequence as "sequence: Sequence",
sender as "sender: login::Id",
body,
sent_at as "sent_at: DateTime"
"#,
id,
channel.id,
sequence,
sender.id,
body,
sent_at,
)
.map(|row| types::ChannelEvent {
sequence: row.sequence,
at: row.sent_at,
channel: channel.clone(),
data: types::MessageEvent {
sender: sender.clone(),
message: message::Message {
id: row.id,
body: row.body,
},
}
.into(),
})
.fetch_one(&mut *self.0)
.await?;
Ok(message)
}
async fn next_sequence_for(&mut self, channel: &Channel) -> Result<Sequence, sqlx::Error> {
let current = sqlx::query_scalar!(
r#"
-- `max` never returns null, but sqlx can't detect that
select max(sequence) as "sequence!: Sequence"
from message
where channel = $1
"#,
channel.id,
)
.fetch_one(&mut *self.0)
.await?;
Ok(current.next())
}
pub async fn expire(&mut self, expire_at: &DateTime) -> Result<(), sqlx::Error> {
sqlx::query!(
r#"
delete from message
where sent_at < $1
"#,
expire_at,
)
.execute(&mut *self.0)
.await?;
Ok(())
}
pub async fn replay(
&mut self,
channel: &Channel,
resume_at: Option<Sequence>,
) -> Result<Vec<types::ChannelEvent>, sqlx::Error> {
let events = sqlx::query!(
r#"
select
message.id as "id: message::Id",
sequence as "sequence: Sequence",
login.id as "sender_id: login::Id",
login.name as sender_name,
message.body,
message.sent_at as "sent_at: DateTime"
from message
join login on message.sender = login.id
where channel = $1
and coalesce(sequence > $2, true)
order by sequence asc
"#,
channel.id,
resume_at,
)
.map(|row| types::ChannelEvent {
sequence: row.sequence,
at: row.sent_at,
channel: channel.clone(),
data: types::MessageEvent {
sender: login::Login {
id: row.sender_id,
name: row.sender_name,
},
message: message::Message {
id: row.id,
body: row.body,
},
}
.into(),
})
.fetch_all(&mut *self.0)
.await?;
Ok(events)
}
}
|
