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|
use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
use crate::{
clock::DateTime,
repo::{
channel::Channel,
login::{self, Login},
message,
},
};
pub trait Provider {
fn broadcast(&mut self) -> Broadcast;
}
impl<'c> Provider for Transaction<'c, Sqlite> {
fn broadcast(&mut self) -> Broadcast {
Broadcast(self)
}
}
pub struct Broadcast<'t>(&'t mut SqliteConnection);
#[derive(Clone, Debug, Eq, PartialEq, serde::Serialize)]
pub struct Message {
pub id: message::Id,
pub sequence: Sequence,
pub sender: Login,
pub body: String,
pub sent_at: DateTime,
}
impl<'c> Broadcast<'c> {
pub async fn create(
&mut self,
sender: &Login,
channel: &Channel,
body: &str,
sent_at: &DateTime,
) -> Result<Message, 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| Message {
id: row.id,
sequence: row.sequence,
sender: sender.clone(),
body: row.body,
sent_at: row.sent_at,
})
.fetch_one(&mut *self.0)
.await?;
Ok(message)
}
async fn next_sequence_for(&mut self, channel: &Channel) -> Result<Sequence, sqlx::Error> {
let Sequence(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(Sequence(current + 1))
}
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<Message>, sqlx::Error> {
let messages = 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| Message {
id: row.id,
sequence: row.sequence,
sender: Login {
id: row.sender_id,
name: row.sender_name,
},
body: row.body,
sent_at: row.sent_at,
})
.fetch_all(&mut *self.0)
.await?;
Ok(messages)
}
}
#[derive(
Debug,
Eq,
Ord,
PartialEq,
PartialOrd,
Clone,
Copy,
serde::Serialize,
serde::Deserialize,
sqlx::Type,
)]
#[serde(transparent)]
#[sqlx(transparent)]
pub struct Sequence(i64);
|
