Consolidate most repository types into a repo module.

Having them contained in the individual endpoint groups conveyed an unintended sense that their intended scope was _only_ that endpoint group. It also made most repo-related import paths _quite_ long. This splits up the repos as follows:

* "General applicability" repos - those that are only loosely connected to a single task, and are likely to be shared between tasks - go in crate::repo.

* Specialized repos - those tightly connected to a specific task - go in the module for that task, under crate::PATH::repo.

In both cases, each repo goes in its own submodule, to make it easier to use the module name as a namespace.

Which category a repo goes in is a judgment call. `crate::channel::repo::broadcast` (formerly `channel::repo::messages`) is used outside of `crate::channel`, for example, but its main purpose is to support channel message broadcasts. It could arguably live under `crate::event::repo::channel`, but the resulting namespace is less legible to me.

1 files changed, 112 insertions, 0 deletions

diff --git a/src/channel/repo/broadcast.rs b/src/channel/repo/broadcast.rs
new file mode 100644
index 0000000..3ca7396
--- /dev/null
+++ b/src/channel/repo/broadcast.rs
@@ -0,0 +1,112 @@
+use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
+
+use crate::{
+    clock::DateTime,
+    repo::{
+        channel,
+        login::{self, Login, Logins},
+        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, serde::Serialize)]
+pub struct Message {
+    pub id: message::Id,
+    pub sender: Login,
+    pub body: String,
+    pub sent_at: DateTime,
+}
+
+impl<'c> Broadcast<'c> {
+    pub async fn create(
+        &mut self,
+        sender: &login::Id,
+        channel: &channel::Id,
+        body: &str,
+        sent_at: &DateTime,
+    ) -> Result<Message, sqlx::Error> {
+        let id = message::Id::generate();
+
+        let sender = Logins::from(&mut *self.0).by_id(sender).await?;
+
+        let message = sqlx::query!(
+            r#"
+				insert into message
+					(id, sender, channel, body, sent_at)
+				values ($1, $2, $3, $4, $5)
+				returning
+					id as "id: message::Id",
+					sender as "sender: login::Id",
+					body,
+					sent_at as "sent_at: DateTime"
+			"#,
+            id,
+            sender.id,
+            channel,
+            body,
+            sent_at,
+        )
+        .map(|row| {
+            debug_assert!(row.sender == sender.id);
+            Message {
+                id: row.id,
+                sender: sender.clone(),
+                body: row.body,
+                sent_at: row.sent_at,
+            }
+        })
+        .fetch_one(&mut *self.0)
+        .await?;
+
+        Ok(message)
+    }
+
+    pub async fn replay(
+        &mut self,
+        channel: &channel::Id,
+        resume_at: Option<&DateTime>,
+    ) -> Result<Vec<Message>, sqlx::Error> {
+        let messages = sqlx::query!(
+            r#"
+				select
+					message.id as "id: message::Id",
+					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(sent_at > $2, true)
+				order by sent_at asc
+			"#,
+            channel,
+            resume_at,
+        )
+        .map(|row| Message {
+            id: row.id,
+            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)
+    }
+}