wip

.gitignore

@@ -1,3 +1,3 @@
 /target
 config.json
-matrix-meshtastic-bridge.db*
+/state

Cargo.toml

@@ -12,4 +12,4 @@ meshtastic = "0.1.6"
 serde = { version = "1.0.210", features = ["derive"]}
 serde_json = "1.0.128"
 sqlx = { version = "0.7.3", features = ["runtime-tokio-native-tls", "sqlite"] }
-tokio = "1.40.0"
+tokio = { version = "1.40.0", features = ["full"] }

migrations/20241011053437_init.sql

@@ -13,3 +13,9 @@ CREATE TABLE remote_user (
     node_name VARCHAR(100) NOT NULL,
     room VARCHAR(100) NOT NULL
 );
+
+CREATE TABLE matrix_state (
+    id INTEGER PRIMARY KEY NOT NULL,
+    key TEXT UNIQUE NOT NULL,
+    value TEXT NOT NULL
+);

src/bridge.rs

@@ -31,7 +31,7 @@ impl Bridge {
         let (meshtastic_listener, meshtastic_stream_api) = stream_api.connect(serial_stream).await;
 
         // setup matrix client
-        let matrix_client = matrix::build(config.matrix)
+        let matrix_client = matrix::build(config.matrix, &db)
             .await
             .expect("error logging into matrix");
         matrix_client.sync_once(SyncSettings::default()).await?;

src/config.rs

@@ -11,10 +11,15 @@ pub(crate) struct Config {
 #[derive(serde::Deserialize, Debug)]
 pub(crate) struct MatrixConfig {
     pub(crate) username: String,
+    #[serde(default = "get_matrix_password")]
     pub(crate) password: String,
-    #[serde(default = "get_device_name")]
+    #[serde(default = "get_matrix_device_name")]
     pub(crate) device_name: String,
     pub(crate) room: String,
+    #[serde(default = "get_matrix_state_dir")]
+    pub(crate) state_dir: String,
+    #[serde(default = "get_matrix_state_passphrase")]
+    pub(crate) state_passphrase: String,
 }
 
 #[derive(serde::Deserialize, Debug)]
@@ -22,12 +27,30 @@ pub(crate) struct MeshtasticConfig {
     pub(crate) device: String,
 }
 
-fn get_device_name() -> String {
+fn get_matrix_device_name() -> String {
     "meshtastic-bridge".to_string()
 }
 
 fn get_db_uri() -> String {
-    "sqlite://matrix-meshtastic-bridge.db".to_string()
+    "sqlite://state/matrix-meshtastic-bridge.db".to_string()
+}
+
+fn get_matrix_password() -> String {
+    match std::env::var("MATRIX_PASSWORD") {
+        Ok(p) => p,
+        Err(_) => "".to_string(),
+    }
+}
+
+fn get_matrix_state_dir() -> String {
+    "state".to_string()
+}
+
+fn get_matrix_state_passphrase() -> String {
+    match std::env::var("MATRIX_STATE_PASSPHRASE") {
+        Ok(p) => p,
+        Err(_) => "a".to_string(), // I'm sorry but encryption at rest is dumb if the decryption key is stored in the same place as the encrypted data
+    }
 }
 
 pub(crate) async fn read_config() -> Config {

src/db.rs

@@ -1,9 +1,4 @@
-use meshtastic::protobufs::MyNodeInfo;
-use sqlx::{
-    migrate::{MigrateDatabase, Migrator},
-    sqlite::SqlitePool,
-    Executor, Pool, Sqlite,
-};
+use sqlx::{migrate::MigrateDatabase, sqlite::SqlitePool, Pool, Sqlite};
 
 #[derive(Debug, sqlx::FromRow)]
 pub(crate) struct Device {
@@ -24,6 +19,12 @@ pub(crate) struct RemoteUser {
     pub(crate) room: String,
 }
 
+#[derive(Debug, sqlx::FromRow)]
+struct MatrixState {
+    key: String,
+    value: String,
+}
+
 pub(crate) struct DB {
     pool: Pool<Sqlite>,
 }
@@ -51,7 +52,7 @@ pub(crate) async fn setup(db_url: String) -> Result<DB, Box<dyn std::error::Erro
 
 impl DB {
     pub async fn get_device(
-        self: DB,
+        self: &DB,
         node_num: i32,
     ) -> Result<Option<Device>, Box<dyn std::error::Error>> {
         let query = sqlx::query_as::<_, Device>("SELECT * FROM devices WHERE node_num = ? LIMIT 1");
@@ -72,7 +73,57 @@ impl DB {
         Ok(())
     }
 
-    pub async fn close(self: DB) {
+    pub async fn get_matrix_session(
+        self: &DB,
+    ) -> Result<Option<matrix_sdk::matrix_auth::MatrixSession>, Box<dyn std::error::Error>> {
+        let session = match self.get_matrix_state("session".to_string()).await? {
+            Some(session_json) => serde_json::from_str(&session_json)?,
+            None => None,
+        };
+
+        Ok(session)
+    }
+
+    pub async fn set_matrix_session(
+        self: &DB,
+        session: matrix_sdk::matrix_auth::MatrixSession,
+    ) -> anyhow::Result<()> {
+        let session_json = serde_json::to_string(&session)?;
+
+        self.set_matrix_state("session".to_string(), session_json)
+            .await
+    }
+
+    pub async fn get_matrix_sync_token(self: &DB) -> anyhow::Result<Option<String>> {
+        self.get_matrix_state("session_store".to_string()).await
+    }
+
+    pub async fn set_matrix_sync_token(self: &DB, token: String) -> anyhow::Result<()> {
+        self.set_matrix_state("session_store".to_string(), token)
+            .await
+    }
+
+    async fn set_matrix_state(self: &DB, key: String, value: String) -> anyhow::Result<()> {
+        let query = sqlx::query("INSERT INTO matrix_state (key, value) VALUES (?, ?) ON CONFLICT(key) DO UPDATE SET value=excluded.value");
+
+        query.bind(key).bind(value).execute(&self.pool).await?;
+
+        Ok(())
+    }
+
+    pub async fn get_matrix_state(self: &DB, key: String) -> anyhow::Result<Option<String>> {
+        let query = sqlx::query_as::<_, MatrixState>(
+            "SELECT value FROM matrix_state WHERE 'key' = ? LIMIT 1",
+        );
+        let result = match query.bind(key).fetch_optional(&self.pool).await.unwrap() {
+            Some(row) => Some(row.value),
+            None => None,
+        };
+
+        Ok(result)
+    }
+
+    pub async fn close(self: &DB) {
         self.pool.close().await
     }
 }

src/main.rs

@@ -1,4 +1,4 @@
-use matrix_sdk::{config::SyncSettings, ruma::RoomId};
+use matrix_sdk::ruma::RoomId;
 use tokio::signal;
 use tokio::sync::mpsc;
 
@@ -27,23 +27,23 @@ async fn main() -> anyhow::Result<()> {
 
     let config = config::read_config().await;
 
-    let pool = db::setup(config.db).await.expect("error connecting to db");
+    let db = db::setup(config.db).await.expect("error connecting to db");
 
     let (matrix_tx, matrix_rx) = mpsc::channel(32);
 
     let room_id = RoomId::parse(&config.matrix.room).expect("invalid room id");
     log::debug!("matrix room: {:?}", room_id);
 
-    let matrix_client = matrix::build(config.matrix)
+    let matrix_client = matrix::build(config.matrix, &db)
         .await
         .expect("error logging into matrix");
 
-    matrix_client.sync_once(SyncSettings::default()).await?;
-
     let meshtastic_client = meshtastic::build(config.meshtastic)
         .await
         .expect("error connecting to meshtastic");
 
+    log::info!("matrix and meshtatic clients ready, spawning threads");
+
     tokio::spawn(async {
         meshtastic_client
             .receive(matrix_tx)
@@ -52,7 +52,7 @@ async fn main() -> anyhow::Result<()> {
     });
 
     tokio::spawn(matrix::sender(matrix_client.clone(), matrix_rx, room_id));
-    tokio::spawn(matrix::sync(matrix_client.clone()));
+    tokio::spawn(matrix::sync(matrix_client.clone(), &db));
 
     match signal::ctrl_c().await {
         Ok(()) => {}
@@ -62,7 +62,7 @@ async fn main() -> anyhow::Result<()> {
     }
 
     log::debug!("shutting down database connection");
-    pool.close().await;
+    db.close().await;
     log::debug!("db connection closed");
 
     Ok(())

src/matrix.rs

@@ -1,35 +1,58 @@
-use crate::config;
+use crate::{config, db};
 use log;
 use matrix_sdk::{
     config::SyncSettings,
     ruma::{
+        api::client::filter::FilterDefinition,
         events::room::{
             member::StrippedRoomMemberEvent,
             message::{RoomMessageEventContent, SyncRoomMessageEvent},
         },
         OwnedRoomId, TransactionId, UserId,
     },
-    Client, Room,
+    Client, Error, LoopCtrl, Room,
 };
 use tokio::sync::mpsc::Receiver;
 use tokio::time::{sleep, Duration};
 
 pub(crate) async fn build(
     config: config::MatrixConfig,
+    db: &db::DB,
 ) -> Result<matrix_sdk::Client, anyhow::Error> {
+    log::debug!("creating matrix client");
     let user = UserId::parse(config.username)
         .expect("invalid matrix username - should be a full mxid with server");
+
+    log::debug!("storing matrix client state in {}", config.state_dir);
     let client = Client::builder()
         .server_name(user.server_name())
+        .sqlite_store(config.state_dir, Some(&config.state_passphrase))
         .build()
         .await?;
 
-    client
-        .matrix_auth()
-        .login_username(user, &config.password)
-        .initial_device_display_name(&config.device_name)
-        .send()
-        .await?;
+    log::debug!("checking if there's an existing session");
+    match db.get_matrix_session().await.unwrap() {
+        Some(session) => {
+            log::debug!("restoring session from database");
+            client.restore_session(session).await?;
+        }
+        None => {
+            log::debug!("no existing session. Logging in");
+            let matrix_auth = client.matrix_auth();
+            matrix_auth
+                .login_username(user, &config.password)
+                .initial_device_display_name(&config.device_name)
+                .send()
+                .await?;
+
+            log::debug!("creating new session");
+            let session = matrix_auth
+                .session()
+                .expect("A logged-in matrix client should have a session");
+
+            db.set_matrix_session(session).await.unwrap();
+        }
+    }
 
     client.add_event_handler(|ev: SyncRoomMessageEvent| async move {
         log::debug!("[matrix] Received a message {:?}", ev);
@@ -37,7 +60,11 @@ pub(crate) async fn build(
 
     client.add_event_handler(on_stripped_state_member);
 
-    log::debug!("connected to matrix");
+    log::debug!("connected to matrix, syncing");
+
+    client.sync_once(SyncSettings::default()).await?;
+
+    log::info!("connected to matrix server and synchronized state, ready to continue startup");
 
     return Ok(client);
 }
@@ -106,9 +133,57 @@ pub(crate) async fn sender(
     }
 }
 
-pub(crate) async fn sync(client: Client) {
+pub(crate) async fn sync(client: Client, db: &db::DB) -> anyhow::Result<()> {
+    let filter = FilterDefinition::with_lazy_loading();
+    let mut sync_settings = SyncSettings::default().filter(filter.into());
+
+    if let Some(token) = db
+        .get_matrix_sync_token()
+        .await
+        .map_err(|err| Error::UnknownError(err.into()))?
+    {
+        sync_settings = sync_settings.token(token);
+    }
+
     client
         .sync(SyncSettings::default())
         .await
         .expect("error syncing matrix");
+
+    loop {
+        match client.sync_once(sync_settings.clone()).await {
+            Ok(response) => {
+                // This is the last time we need to provide this token, the sync method after
+                // will handle it on its own.
+                sync_settings = sync_settings.token(response.next_batch.clone());
+                db.set_matrix_sync_token(response.next_batch).await?;
+                break;
+            }
+            Err(error) => {
+                log::error!("An error occurred during initial sync: {error}");
+                log::error!("Trying again…");
+            }
+        }
+    }
+
+    log::info!("The client is ready! Listening to new messages…");
+
+    // Now that we've synced, let's attach a handler for incoming room messages.
+    // client.add_event_handler(on_room_message);
+
+    // This loops until we kill the program or an error happens.
+    client
+        .sync_with_result_callback(sync_settings, |sync_result| async move {
+            let response = sync_result?;
+
+            // We persist the token each time to be able to restore our session
+            db.set_matrix_sync_token(response.next_batch)
+                .await
+                .map_err(|err| Error::UnknownError(err.into()))?;
+
+            Ok(LoopCtrl::Continue)
+        })
+        .await?;
+
+    Ok(())
 }