full backend rewrite.

calling this v0.4.0

backend/src/repo/message_repo.rs

@@ -0,0 +1,95 @@
+use crate::api::chat::ChatMsg;
+use crate::repo::Repo;
+use chrono::{DateTime, Utc};
+use sqlx::PgPool;
+
+#[derive(Clone)]
+pub struct MessageRepository {
+	pool: PgPool
+}
+
+impl Repo for MessageRepository {
+	type Target = ChatMsg;
+
+	fn new(pool: PgPool) -> Self {
+		Self { pool }
+	}
+
+	// TODO: caching with redis
+	async fn get_by_id(&self, id: i64) -> Option<Self::Target> {
+		sqlx::query!(
+			"SELECT u.username, u.nickname, u.id as user_id, m.content, m.created_at
+            FROM messages m
+            JOIN users u ON m.user_id = u.id
+            WHERE m.id = $1",
+		   	id
+		).fetch_optional(&self.pool).await.ok().flatten().map(|row| ChatMsg {
+				display_name: Some(row.nickname.unwrap_or(row.username)),
+				user_id: row.user_id,
+				text: row.content,
+				timestamp: row.created_at,
+			})
+	}
+}
+
+impl MessageRepository {
+
+	// TODO! caching with redis
+	pub async fn create_new(
+		&self, uid: i64, channel_id: i64,
+		text: &str, created_at: DateTime<Utc>
+	) -> Result<i64, sqlx::Error> {
+		sqlx::query!(
+			"INSERT INTO messages (channel_id, user_id, content, created_at)
+			VALUES ($1, $2, $3, $4) RETURNING id",
+			channel_id,
+			uid,
+			text,
+			created_at
+		).fetch_optional(&self.pool).await.and_then(|row| row.map(|r| r.id).ok_or(sqlx::Error::RowNotFound))
+	}
+
+	/// TODO: caching with redis
+	pub async fn get_by_channel(&self, channel_id: i64, limit: usize)
+		-> Result<Vec<ChatMsg>, sqlx::Error> {
+		sqlx::query!(
+			"SELECT u.username, u.nickname, u.id as user_id, m.content, m.created_at
+            FROM messages m
+            JOIN users u ON m.user_id = u.id
+            WHERE m.channel_id = $1
+            ORDER BY m.created_at DESC LIMIT $2",
+			channel_id,
+			limit as i64
+		).fetch_all(&self.pool).await.map(|messages| {
+			messages.into_iter().rev().map(|msg| {
+				ChatMsg {
+					display_name: Some(msg.nickname.unwrap_or(msg.username)),
+					user_id: msg.user_id,
+					text: msg.content,
+					timestamp: msg.created_at,
+				}
+			}).collect::<Vec<_>>()
+		})
+	}
+}
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