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use std::fmt;
use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
use crate::id::Id as BaseId;
use crate::{error::BoxedError, login::repo::logins::Id as LoginId};
pub trait Provider {
fn channels(&mut self) -> Channels;
}
impl<'c> Provider for Transaction<'c, Sqlite> {
fn channels(&mut self) -> Channels {
Channels(self)
}
}
pub struct Channels<'t>(&'t mut SqliteConnection);
#[derive(Debug)]
pub struct Channel {
pub id: Id,
pub name: String,
}
impl<'c> Channels<'c> {
/// Create a new channel.
pub async fn create(&mut self, name: &str) -> Result<Channel, BoxedError> {
let id = Id::generate();
let channel = sqlx::query_as!(
Channel,
r#"
insert
into channel (id, name)
values ($1, $2)
returning id as "id: Id", name
"#,
id,
name,
)
.fetch_one(&mut *self.0)
.await?;
Ok(channel)
}
/// Enrol a login in a channel.
pub async fn join(&mut self, channel: &Id, login: &LoginId) -> Result<(), BoxedError> {
sqlx::query!(
r#"
insert
into channel_member (channel, login)
values ($1, $2)
"#,
channel,
login,
)
.execute(&mut *self.0)
.await?;
Ok(())
}
pub async fn joined(&mut self, login: &LoginId) -> Result<Vec<Channel>, BoxedError> {
let channels = sqlx::query_as!(
Channel,
r#"
select
channel.id as "id: Id",
channel.name
from channel
join channel_member
on (channel.id = channel_member.channel)
where channel_member.login = $1
order by channel.name
"#,
login,
)
.fetch_all(&mut *self.0)
.await?;
Ok(channels)
}
pub async fn unjoined(&mut self, login: &LoginId) -> Result<Vec<Channel>, BoxedError> {
let channels = sqlx::query_as!(
Channel,
r#"
select
channel.id as "id: Id",
channel.name
from channel
except
select
channel.id as "id: Id",
channel.name
from channel
join channel_member
on (channel.id = channel_member.channel)
where channel_member.login = $1
order by channel.name
"#,
login,
)
.fetch_all(&mut *self.0)
.await?;
Ok(channels)
}
/// Unenrol a login from a channel.
pub async fn leave(&mut self, channel: &Id, login: &LoginId) -> Result<(), BoxedError> {
sqlx::query_scalar!(
r#"
delete
from channel_member
where channel = $1
and login = $2
returning 1 as "deleted: bool"
"#,
channel,
login,
)
.fetch_one(&mut *self.0)
.await?;
Ok(())
}
}
/// Stable identifier for a [Channel]. Prefixed with `C`.
#[derive(Debug, sqlx::Type, serde::Deserialize)]
#[sqlx(transparent)]
#[serde(transparent)]
pub struct Id(BaseId);
impl From<BaseId> for Id {
fn from(id: BaseId) -> Self {
Self(id)
}
}
impl Id {
pub fn generate() -> Self {
BaseId::generate("C")
}
}
impl fmt::Display for Id {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
|
