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-rw-r--r--src/channel/repo.rs349
1 files changed, 251 insertions, 98 deletions
diff --git a/src/channel/repo.rs b/src/channel/repo.rs
index 2f57581..a49db52 100644
--- a/src/channel/repo.rs
+++ b/src/channel/repo.rs
@@ -1,9 +1,12 @@
+use futures::stream::{StreamExt as _, TryStreamExt as _};
use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
use crate::{
channel::{Channel, History, Id},
clock::DateTime,
+ db::NotFound,
event::{Instant, ResumePoint, Sequence},
+ name::{self, Name},
};
pub trait Provider {
@@ -19,130 +22,162 @@ impl<'c> Provider for Transaction<'c, Sqlite> {
pub struct Channels<'t>(&'t mut SqliteConnection);
impl<'c> Channels<'c> {
- pub async fn create(&mut self, name: &str, created: &Instant) -> Result<History, sqlx::Error> {
+ pub async fn create(&mut self, name: &Name, created: &Instant) -> Result<History, sqlx::Error> {
let id = Id::generate();
- let channel = sqlx::query!(
+ let name = name.clone();
+ let display_name = name.display();
+ let canonical_name = name.canonical();
+ let created = *created;
+
+ sqlx::query!(
r#"
insert
- into channel (id, name, created_at, created_sequence)
- values ($1, $2, $3, $4)
- returning
- id as "id: Id",
- name,
- created_at as "created_at: DateTime",
- created_sequence as "created_sequence: Sequence"
+ into channel (id, created_at, created_sequence)
+ values ($1, $2, $3)
"#,
id,
- name,
created.at,
created.sequence,
)
- .map(|row| History {
+ .execute(&mut *self.0)
+ .await?;
+
+ sqlx::query!(
+ r#"
+ insert into channel_name (id, display_name, canonical_name)
+ values ($1, $2, $3)
+ "#,
+ id,
+ display_name,
+ canonical_name,
+ )
+ .execute(&mut *self.0)
+ .await?;
+
+ let channel = History {
channel: Channel {
- id: row.id,
- name: row.name,
- },
- created: Instant {
- at: row.created_at,
- sequence: row.created_sequence,
+ id,
+ name: name.clone(),
+ deleted_at: None,
},
+ created,
deleted: None,
- })
- .fetch_one(&mut *self.0)
- .await?;
+ };
Ok(channel)
}
- pub async fn by_id(&mut self, channel: &Id) -> Result<History, sqlx::Error> {
+ pub async fn by_id(&mut self, channel: &Id) -> Result<History, LoadError> {
let channel = sqlx::query!(
r#"
select
id as "id: Id",
- name,
- created_at as "created_at: DateTime",
- created_sequence as "created_sequence: Sequence"
+ name.display_name as "display_name?: String",
+ name.canonical_name as "canonical_name?: String",
+ channel.created_at as "created_at: DateTime",
+ channel.created_sequence as "created_sequence: Sequence",
+ deleted.deleted_at as "deleted_at?: DateTime",
+ deleted.deleted_sequence as "deleted_sequence?: Sequence"
from channel
+ left join channel_name as name
+ using (id)
+ left join channel_deleted as deleted
+ using (id)
where id = $1
"#,
channel,
)
- .map(|row| History {
- channel: Channel {
- id: row.id,
- name: row.name,
- },
- created: Instant {
- at: row.created_at,
- sequence: row.created_sequence,
- },
- deleted: None,
+ .map(|row| {
+ Ok::<_, name::Error>(History {
+ channel: Channel {
+ id: row.id,
+ name: Name::optional(row.display_name, row.canonical_name)?.unwrap_or_default(),
+ deleted_at: row.deleted_at,
+ },
+ created: Instant::new(row.created_at, row.created_sequence),
+ deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
+ })
})
.fetch_one(&mut *self.0)
- .await?;
+ .await??;
Ok(channel)
}
- pub async fn all(&mut self, resume_at: ResumePoint) -> Result<Vec<History>, sqlx::Error> {
+ pub async fn all(&mut self, resume_at: Sequence) -> Result<Vec<History>, LoadError> {
let channels = sqlx::query!(
r#"
select
id as "id: Id",
- name,
- created_at as "created_at: DateTime",
- created_sequence as "created_sequence: Sequence"
+ name.display_name as "display_name?: String",
+ name.canonical_name as "canonical_name?: String",
+ channel.created_at as "created_at: DateTime",
+ channel.created_sequence as "created_sequence: Sequence",
+ deleted.deleted_at as "deleted_at?: DateTime",
+ deleted.deleted_sequence as "deleted_sequence?: Sequence"
from channel
- where coalesce(created_sequence <= $1, true)
- order by channel.name
+ left join channel_name as name
+ using (id)
+ left join channel_deleted as deleted
+ using (id)
+ where channel.created_sequence <= $1
+ order by name.canonical_name
"#,
resume_at,
)
- .map(|row| History {
- channel: Channel {
- id: row.id,
- name: row.name,
- },
- created: Instant {
- at: row.created_at,
- sequence: row.created_sequence,
- },
- deleted: None,
+ .map(|row| {
+ Ok::<_, name::Error>(History {
+ channel: Channel {
+ id: row.id,
+ name: Name::optional(row.display_name, row.canonical_name)?.unwrap_or_default(),
+ deleted_at: row.deleted_at,
+ },
+ created: Instant::new(row.created_at, row.created_sequence),
+ deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
+ })
})
- .fetch_all(&mut *self.0)
+ .fetch(&mut *self.0)
+ .map(|res| Ok::<_, LoadError>(res??))
+ .try_collect()
.await?;
Ok(channels)
}
- pub async fn replay(
- &mut self,
- resume_at: Option<Sequence>,
- ) -> Result<Vec<History>, sqlx::Error> {
+ pub async fn replay(&mut self, resume_at: ResumePoint) -> Result<Vec<History>, LoadError> {
let channels = sqlx::query!(
r#"
select
id as "id: Id",
- name,
- created_at as "created_at: DateTime",
- created_sequence as "created_sequence: Sequence"
+ name.display_name as "display_name: String",
+ name.canonical_name as "canonical_name: String",
+ channel.created_at as "created_at: DateTime",
+ channel.created_sequence as "created_sequence: Sequence",
+ deleted.deleted_at as "deleted_at?: DateTime",
+ deleted.deleted_sequence as "deleted_sequence?: Sequence"
from channel
- where coalesce(created_sequence > $1, true)
+ left join channel_name as name
+ using (id)
+ left join channel_deleted as deleted
+ using (id)
+ where coalesce(channel.created_sequence > $1, true)
"#,
resume_at,
)
- .map(|row| History {
- channel: Channel {
- id: row.id,
- name: row.name,
- },
- created: Instant {
- at: row.created_at,
- sequence: row.created_sequence,
- },
- deleted: None,
+ .map(|row| {
+ Ok::<_, name::Error>(History {
+ channel: Channel {
+ id: row.id,
+ name: Name::optional(row.display_name, row.canonical_name)?.unwrap_or_default(),
+ deleted_at: row.deleted_at,
+ },
+ created: Instant::new(row.created_at, row.created_sequence),
+ deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
+ })
})
- .fetch_all(&mut *self.0)
+ .fetch(&mut *self.0)
+ .map(|res| Ok::<_, LoadError>(res??))
+ .try_collect()
.await?;
Ok(channels)
@@ -150,53 +185,171 @@ impl<'c> Channels<'c> {
pub async fn delete(
&mut self,
- channel: &Id,
+ channel: &History,
deleted: &Instant,
- ) -> Result<History, sqlx::Error> {
- let channel = sqlx::query!(
+ ) -> Result<History, LoadError> {
+ let id = channel.id();
+ sqlx::query!(
r#"
- delete from channel
+ insert into channel_deleted (id, deleted_at, deleted_sequence)
+ values ($1, $2, $3)
+ "#,
+ id,
+ deleted.at,
+ deleted.sequence,
+ )
+ .execute(&mut *self.0)
+ .await?;
+
+ // Small social responsibility hack here: when a channel is deleted, its name is
+ // retconned to have been the empty string. Someone reading the event stream
+ // afterwards, or looking at channels via the API, cannot retrieve the
+ // "deleted" channel's information by ignoring the deletion event.
+ //
+ // This also avoids the need for a separate name reservation table to ensure
+ // that live channels have unique names, since the `channel` table's name field
+ // is unique over non-null values.
+ sqlx::query!(
+ r#"
+ delete from channel_name
where id = $1
- returning
- id as "id: Id",
- name,
- created_at as "created_at: DateTime",
- created_sequence as "created_sequence: Sequence"
"#,
- channel,
+ id,
)
- .map(|row| History {
- channel: Channel {
- id: row.id,
- name: row.name,
- },
- created: Instant {
- at: row.created_at,
- sequence: row.created_sequence,
- },
- deleted: Some(*deleted),
- })
- .fetch_one(&mut *self.0)
+ .execute(&mut *self.0)
.await?;
+ let channel = self.by_id(id).await?;
+
Ok(channel)
}
- pub async fn expired(&mut self, expired_at: &DateTime) -> Result<Vec<Id>, sqlx::Error> {
+ pub async fn purge(&mut self, purge_at: &DateTime) -> Result<(), sqlx::Error> {
let channels = sqlx::query_scalar!(
r#"
+ with has_messages as (
+ select channel
+ from message
+ group by channel
+ )
+ delete from channel_deleted
+ where deleted_at < $1
+ and id not in has_messages
+ returning id as "id: Id"
+ "#,
+ purge_at,
+ )
+ .fetch_all(&mut *self.0)
+ .await?;
+
+ for channel in channels {
+ // Wanted: a way to batch these up into one query.
+ sqlx::query!(
+ r#"
+ delete from channel
+ where id = $1
+ "#,
+ channel,
+ )
+ .execute(&mut *self.0)
+ .await?;
+ }
+
+ Ok(())
+ }
+
+ pub async fn expired(&mut self, expired_at: &DateTime) -> Result<Vec<History>, LoadError> {
+ let channels = sqlx::query!(
+ r#"
select
- channel.id as "id: Id"
+ channel.id as "id: Id",
+ name.display_name as "display_name?: String",
+ name.canonical_name as "canonical_name?: String",
+ channel.created_at as "created_at: DateTime",
+ channel.created_sequence as "created_sequence: Sequence",
+ deleted.deleted_at as "deleted_at?: DateTime",
+ deleted.deleted_sequence as "deleted_sequence?: Sequence"
from channel
- left join message
- where created_at < $1
+ left join channel_name as name
+ using (id)
+ left join channel_deleted as deleted
+ using (id)
+ left join message
+ on channel.id = message.channel
+ where channel.created_at < $1
and message.id is null
+ and deleted.id is null
"#,
expired_at,
)
- .fetch_all(&mut *self.0)
+ .map(|row| {
+ Ok::<_, name::Error>(History {
+ channel: Channel {
+ id: row.id,
+ name: Name::optional(row.display_name, row.canonical_name)?.unwrap_or_default(),
+ deleted_at: row.deleted_at,
+ },
+ created: Instant::new(row.created_at, row.created_sequence),
+ deleted: Instant::optional(row.deleted_at, row.deleted_sequence),
+ })
+ })
+ .fetch(&mut *self.0)
+ .map(|res| Ok::<_, LoadError>(res??))
+ .try_collect()
.await?;
Ok(channels)
}
+
+ pub async fn recanonicalize(&mut self) -> Result<(), sqlx::Error> {
+ let channels = sqlx::query!(
+ r#"
+ select
+ id as "id: Id",
+ display_name as "display_name: String"
+ from channel_name
+ "#,
+ )
+ .fetch_all(&mut *self.0)
+ .await?;
+
+ for channel in channels {
+ let name = Name::from(channel.display_name);
+ let canonical_name = name.canonical();
+
+ sqlx::query!(
+ r#"
+ update channel_name
+ set canonical_name = $1
+ where id = $2
+ "#,
+ canonical_name,
+ channel.id,
+ )
+ .execute(&mut *self.0)
+ .await?;
+ }
+
+ Ok(())
+ }
+}
+
+#[derive(Debug, thiserror::Error)]
+#[error(transparent)]
+pub enum LoadError {
+ Database(#[from] sqlx::Error),
+ Name(#[from] name::Error),
+}
+
+impl<T> NotFound for Result<T, LoadError> {
+ type Ok = T;
+ type Error = LoadError;
+
+ fn optional(self) -> Result<Option<T>, LoadError> {
+ match self {
+ Ok(value) => Ok(Some(value)),
+ Err(LoadError::Database(sqlx::Error::RowNotFound)) => Ok(None),
+ Err(other) => Err(other),
+ }
+ }
}
generated by cgit v1.2.3 (git 2.39.1) at 2026-01-03 02:18:26 +0000