persistence for rooms

migrations/0_first.sql

@@ -11,5 +11,21 @@ create table challenges_plain_password(
 
 create table rooms(
     id integer primary key autoincrement not null,
-    name string unique not null
+    name string unique not null,
+    topic string not null,
+    message_count integer not null default 0
+);
+
+create table messages(
+    room_id integer not null,
+    id integer not null,  -- unique per room, sequential in one room
+    content string not null,
+    primary key (room_id, id)
+);
+
+create table memberships(
+    user_id integer not null,
+    room_id integer not null,
+    status integer not null, -- 0 for not-joined, 1 for joined, 2 for banned
+    primary key (user_id, room_id)
 );

src/core/player.rs

@@ -354,7 +354,13 @@ impl Player {
                     return;
                 }
 
-                let room = self.rooms.get_or_create_room(room_id.clone());
+                let room = match self.rooms.get_or_create_room(room_id.clone()).await {
+                    Ok(room) => room,
+                    Err(e) => {
+                        log::error!("Failed to get or create room: {e}");
+                        return;
+                    }
+                };
                 room.subscribe(self.player_id.clone(), self.handle.clone())
                     .await;
                 self.my_rooms.insert(room_id.clone(), room.clone());
@@ -384,7 +390,7 @@ impl Player {
                 body,
                 promise,
             } => {
-                let room = self.rooms.get_room(&room_id);
+                let room = self.rooms.get_room(&room_id).await;
                 if let Some(room) = room {
                     room.send_message(self.player_id.clone(), body.clone())
                         .await;
@@ -404,7 +410,7 @@ impl Player {
                 new_topic,
                 promise,
             } => {
-                let room = self.rooms.get_room(&room_id);
+                let room = self.rooms.get_room(&room_id).await;
                 if let Some(mut room) = room {
                     room.set_topic(self.player_id.clone(), new_topic.clone())
                         .await;

src/core/repo/mod.rs

@@ -47,10 +47,39 @@ impl Storage {
         Ok(res)
     }
 
+    pub async fn retrieve_room_by_name(&mut self, name: &str) -> Result<Option<StoredRoom>> {
+        let mut executor = self.conn.lock().await;
+        let res = sqlx::query_as(
+            "select id, name, topic, message_count
+            from rooms
+            where name = ?;",
+        )
+        .bind(name)
+        .fetch_optional(&mut *executor)
+        .await?;
+
+        Ok(res)
+    }
+
+    pub async fn create_new_room(&mut self, name: &str, topic: &str) -> Result<()> {
+        let mut executor = self.conn.lock().await;
+        let _: (u32,) = sqlx::query_as(
+            "insert into rooms(name, topic)
+            values (?, ?)
+            returning id;",
+        )
+        .bind(name)
+        .bind(topic)
+        .fetch_one(&mut *executor)
+        .await?;
+
+        Ok(())
+    }
+
     pub async fn close(mut self) -> Result<()> {
         let res = match Arc::try_unwrap(self.conn) {
             Ok(e) => e,
-            Err(_) => return Err(fail("failed to acquire DB ownership on shutdown")),
+            Err(e) => return Err(fail("failed to acquire DB ownership on shutdown")),
         };
         let res = res.into_inner();
         res.close().await?;
@@ -64,3 +93,11 @@ pub struct StoredUser {
     pub name: String,
     pub password: Option<String>,
 }
+
+#[derive(FromRow)]
+pub struct StoredRoom {
+    pub id: u32,
+    pub name: String,
+    pub topic: String,
+    pub message_count: u32,
+}

src/core/room.rs

@@ -2,17 +2,16 @@
 use std::{
     collections::HashMap,
     hash::Hash,
-    sync::{Arc, RwLock},
+    sync::Arc,
 };
 
 use prometheus::{IntGauge, Registry as MetricRegistry};
 use serde::Serialize;
 use tokio::sync::RwLock as AsyncRwLock;
 
-use crate::{
-    core::player::{PlayerHandle, PlayerId, Updates},
-    prelude::*,
-};
+use crate::core::player::{PlayerHandle, PlayerId, Updates};
+use crate::core::repo::Storage;
+use crate::prelude::*;
 
 /// Opaque room id
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize)]
@@ -40,45 +39,66 @@ impl RoomId {
 
 /// Shared datastructure for storing metadata about rooms.
 #[derive(Clone)]
-pub struct RoomRegistry(Arc<RwLock<RoomRegistryInner>>);
+pub struct RoomRegistry(Arc<AsyncRwLock<RoomRegistryInner>>);
 impl RoomRegistry {
-    pub fn empty(metrics: &mut MetricRegistry) -> Result<RoomRegistry> {
+    pub fn new(metrics: &mut MetricRegistry, storage: Storage) -> Result<RoomRegistry> {
         let metric_active_rooms =
             IntGauge::new("chat_rooms_active", "Number of alive room actors")?;
         metrics.register(Box::new(metric_active_rooms.clone()))?;
         let inner = RoomRegistryInner {
             rooms: HashMap::new(),
             metric_active_rooms,
+            storage,
         };
-        Ok(RoomRegistry(Arc::new(RwLock::new(inner))))
+        Ok(RoomRegistry(Arc::new(AsyncRwLock::new(inner))))
     }
 
-    pub fn get_or_create_room(&mut self, room_id: RoomId) -> RoomHandle {
-        let mut inner = self.0.write().unwrap();
+    pub async fn get_or_create_room(&mut self, room_id: RoomId) -> Result<RoomHandle> {
+        let mut inner = self.0.write().await;
         if let Some(room_handle) = inner.rooms.get(&room_id) {
-            room_handle.clone()
-        } else {
+            // room was already loaded into memory
+            log::debug!("Room {} was loaded already", &room_id.0);
+            Ok(room_handle.clone())
+        } else if let Some(stored_room) = inner.storage.retrieve_room_by_name(&*room_id.0).await? {
+            // room exists, but was not loaded
+            log::debug!("Loading room {}...", &room_id.0);
             let room = Room {
                 room_id: room_id.clone(),
                 subscriptions: HashMap::new(),
-                topic: "New room".into(),
+                topic: stored_room.topic.into(),
+                message_count: stored_room.message_count,
             };
             let room_handle = RoomHandle(Arc::new(AsyncRwLock::new(room)));
             inner.rooms.insert(room_id, room_handle.clone());
             inner.metric_active_rooms.inc();
-            room_handle
+            Ok(room_handle)
+        } else {
+            // room does not exist, create it and load
+            log::debug!("Creating room {}...", &room_id.0);
+            let topic = "New room";
+            let _ = inner.storage.create_new_room(&*room_id.0, &*topic).await?;
+            let room = Room {
+                room_id: room_id.clone(),
+                subscriptions: HashMap::new(),
+                topic: topic.into(),
+                message_count: 0,
+            };
+            let room_handle = RoomHandle(Arc::new(AsyncRwLock::new(room)));
+            inner.rooms.insert(room_id, room_handle.clone());
+            inner.metric_active_rooms.inc();
+            Ok(room_handle)
         }
     }
 
-    pub fn get_room(&self, room_id: &RoomId) -> Option<RoomHandle> {
-        let inner = self.0.read().unwrap();
+    pub async fn get_room(&self, room_id: &RoomId) -> Option<RoomHandle> {
+        let inner = self.0.read().await;
         let res = inner.rooms.get(room_id);
         res.map(|r| r.clone())
     }
 
     pub async fn get_all_rooms(&self) -> Vec<RoomInfo> {
         let handles = {
-            let inner = self.0.read().unwrap();
+            let inner = self.0.read().await;
             let handles = inner.rooms.values().cloned().collect::<Vec<_>>();
             handles
         };
@@ -93,6 +113,7 @@ impl RoomRegistry {
 struct RoomRegistryInner {
     rooms: HashMap<RoomId, RoomHandle>,
     metric_active_rooms: IntGauge,
+    storage: Storage,
 }
 
 #[derive(Clone)]
@@ -145,6 +166,7 @@ impl RoomHandle {
 struct Room {
     room_id: RoomId,
     subscriptions: HashMap<PlayerId, PlayerHandle>,
+    message_count: u32,
     topic: Str,
 }
 impl Room {

src/main.rs

@@ -53,7 +53,7 @@ async fn main() -> Result<()> {
     } = config;
     let mut metrics = MetricsRegistry::new();
     let storage = Storage::open(storage_config).await?;
-    let rooms = RoomRegistry::empty(&mut metrics)?;
+    let rooms = RoomRegistry::new(&mut metrics, storage.clone())?;
     let players = PlayerRegistry::empty(rooms.clone(), &mut metrics)?;
     let telemetry_terminator =
         util::telemetry::launch(telemetry_config, metrics.clone(), rooms.clone()).await?;

src/projections/irc/mod.rs

@@ -311,7 +311,7 @@ async fn handle_update(
             room_id,
         } => {
             if player_id == &new_member_id {
-                if let Some(room) = rooms.get_room(&room_id) {
+                if let Some(room) = rooms.get_room(&room_id).await {
                     let room_info = room.get_room_info().await;
                     let chan = Chan::Global(room_id.as_inner().clone());
                     produce_on_join_cmd_messages(&config, &user, &chan, &room_info, writer).await?;
@@ -482,7 +482,7 @@ async fn handle_incoming_message(
                     writer.flush().await?;
                 }
                 Recipient::Chan(Chan::Global(chan)) => {
-                    let room = rooms.get_room(&RoomId::from(chan.clone())?);
+                    let room = rooms.get_room(&RoomId::from(chan.clone())?).await;
                     if let Some(room) = room {
                         let room_info = room.get_room_info().await;
                         for member in room_info.members {

test/init_state.sql

@@ -0,0 +1,6 @@
+insert into users(name)
+values ('kek'), ('shrek')
+returning id;
+
+insert into challenges_plain_password(user_id, password)
+values (1, 'parolchik1'), (2, 'qwerty123');