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|
use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
use super::{snapshot::Message, Body, History, Id};
use crate::{
channel,
clock::DateTime,
event::{Instant, ResumePoint, Sequence},
login::{self, Login},
};
pub trait Provider {
fn messages(&mut self) -> Messages;
}
impl<'c> Provider for Transaction<'c, Sqlite> {
fn messages(&mut self) -> Messages {
Messages(self)
}
}
pub struct Messages<'t>(&'t mut SqliteConnection);
impl<'c> Messages<'c> {
pub async fn create(
&mut self,
channel: &channel::History,
sender: &Login,
sent: &Instant,
body: &Body,
) -> Result<History, sqlx::Error> {
let id = Id::generate();
let channel_id = channel.id();
let message = sqlx::query!(
r#"
insert into message
(id, channel, sender, sent_at, sent_sequence, body)
values ($1, $2, $3, $4, $5, $6)
returning
id as "id: Id",
channel as "channel: channel::Id",
sender as "sender: login::Id",
sent_at as "sent_at: DateTime",
sent_sequence as "sent_sequence: Sequence",
body as "body: Body"
"#,
id,
channel_id,
sender.id,
sent.at,
sent.sequence,
body,
)
.map(|row| History {
message: Message {
sent: Instant::new(row.sent_at, row.sent_sequence),
channel: row.channel,
sender: row.sender,
id: row.id,
body: row.body.unwrap_or_default(),
deleted_at: None,
},
deleted: None,
})
.fetch_one(&mut *self.0)
.await?;
Ok(message)
}
pub async fn live(&mut self, channel: &channel::History) -> Result<Vec<History>, sqlx::Error> {
let channel_id = channel.id();
let messages = sqlx::query!(
r#"
select
message.channel as "channel: channel::Id",
message.sender as "sender: login::Id",
id as "id: Id",
message.body as "body: Body",
message.sent_at as "sent_at: DateTime",
message.sent_sequence as "sent_sequence: Sequence",
deleted.deleted_at as "deleted_at: DateTime",
deleted.deleted_sequence as "deleted_sequence: Sequence"
from message
left join message_deleted as deleted
using (id)
where message.channel = $1
and deleted.id is null
"#,
channel_id,
)
.map(|row| History {
message: Message {
sent: Instant::new(row.sent_at, row.sent_sequence),
channel: row.channel,
sender: row.sender,
id: row.id,
body: row.body.unwrap_or_default(),
deleted_at: row.deleted_at,
},
deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
})
.fetch_all(&mut *self.0)
.await?;
Ok(messages)
}
pub async fn all(&mut self, resume_at: ResumePoint) -> Result<Vec<History>, sqlx::Error> {
let messages = sqlx::query!(
r#"
select
message.channel as "channel: channel::Id",
message.sender as "sender: login::Id",
id as "id: Id",
message.body as "body: Body",
message.sent_at as "sent_at: DateTime",
message.sent_sequence as "sent_sequence: Sequence",
deleted.deleted_at as "deleted_at: DateTime",
deleted.deleted_sequence as "deleted_sequence: Sequence"
from message
left join message_deleted as deleted
using (id)
where coalesce(message.sent_sequence <= $2, true)
order by message.sent_sequence
"#,
resume_at,
)
.map(|row| History {
message: Message {
sent: Instant::new(row.sent_at, row.sent_sequence),
channel: row.channel,
sender: row.sender,
id: row.id,
body: row.body.unwrap_or_default(),
deleted_at: row.deleted_at,
},
deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
})
.fetch_all(&mut *self.0)
.await?;
Ok(messages)
}
pub async fn by_id(&mut self, message: &Id) -> Result<History, sqlx::Error> {
let message = sqlx::query!(
r#"
select
message.channel as "channel: channel::Id",
message.sender as "sender: login::Id",
id as "id: Id",
message.body as "body: Body",
message.sent_at as "sent_at: DateTime",
message.sent_sequence as "sent_sequence: Sequence",
deleted.deleted_at as "deleted_at?: DateTime",
deleted.deleted_sequence as "deleted_sequence?: Sequence"
from message
left join message_deleted as deleted
using (id)
where id = $1
"#,
message,
)
.map(|row| History {
message: Message {
sent: Instant::new(row.sent_at, row.sent_sequence),
channel: row.channel,
sender: row.sender,
id: row.id,
body: row.body.unwrap_or_default(),
deleted_at: row.deleted_at,
},
deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
})
.fetch_one(&mut *self.0)
.await?;
Ok(message)
}
pub async fn delete(
&mut self,
message: &History,
deleted: &Instant,
) -> Result<History, sqlx::Error> {
let id = message.id();
sqlx::query_scalar!(
r#"
insert into message_deleted (id, deleted_at, deleted_sequence)
values ($1, $2, $3)
returning 1 as "deleted: bool"
"#,
id,
deleted.at,
deleted.sequence,
)
.fetch_one(&mut *self.0)
.await?;
// Small social responsibility hack here: when a message is deleted, its body is
// retconned to have been the empty string. Someone reading the event stream
// afterwards, or looking at messages in the channel, cannot retrieve the
// "deleted" message by ignoring the deletion event.
sqlx::query_scalar!(
r#"
update message
set body = ""
where id = $1
returning 1 as "blanked: bool"
"#,
id,
)
.fetch_one(&mut *self.0)
.await?;
let message = self.by_id(id).await?;
Ok(message)
}
pub async fn purge(&mut self, purge_at: &DateTime) -> Result<(), sqlx::Error> {
let messages = sqlx::query_scalar!(
r#"
delete from message_deleted
where deleted_at < $1
returning id as "id: Id"
"#,
purge_at,
)
.fetch_all(&mut *self.0)
.await?;
for message in messages {
sqlx::query!(
r#"
delete from message
where id = $1
"#,
message,
)
.execute(&mut *self.0)
.await?;
}
Ok(())
}
pub async fn expired(&mut self, expire_at: &DateTime) -> Result<Vec<History>, sqlx::Error> {
let messages = sqlx::query!(
r#"
select
id as "id: Id",
message.channel as "channel: channel::Id",
message.sender as "sender: login::Id",
message.sent_at as "sent_at: DateTime",
message.sent_sequence as "sent_sequence: Sequence",
message.body as "body: Body",
deleted.deleted_at as "deleted_at?: DateTime",
deleted.deleted_sequence as "deleted_sequence?: Sequence"
from message
left join message_deleted as deleted
using (id)
where message.sent_at < $1
and deleted.id is null
"#,
expire_at,
)
.map(|row| History {
message: Message {
sent: Instant::new(row.sent_at, row.sent_sequence),
id: row.id,
channel: row.channel,
sender: row.sender,
body: row.body.unwrap_or_default(),
deleted_at: row.deleted_at,
},
deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
})
.fetch_all(&mut *self.0)
.await?;
Ok(messages)
}
pub async fn replay(&mut self, resume_at: ResumePoint) -> Result<Vec<History>, sqlx::Error> {
let messages = sqlx::query!(
r#"
select
id as "id: Id",
message.channel as "channel: channel::Id",
message.sender as "sender: login::Id",
message.sent_at as "sent_at: DateTime",
message.sent_sequence as "sent_sequence: Sequence",
message.body as "body: Body",
deleted.deleted_at as "deleted_at: DateTime",
deleted.deleted_sequence as "deleted_sequence: Sequence"
from message
left join message_deleted as deleted
using (id)
where coalesce(message.sent_sequence > $1, true)
"#,
resume_at,
)
.map(|row| History {
message: Message {
sent: Instant::new(row.sent_at, row.sent_sequence),
channel: row.channel,
sender: row.sender,
id: row.id,
body: row.body.unwrap_or_default(),
deleted_at: row.deleted_at,
},
deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
})
.fetch_all(&mut *self.0)
.await?;
Ok(messages)
}
}
|
