add version info

src/main.rs

@@ -39,6 +39,8 @@ pub struct GetProgress {
     timestamp: i64,
 }
 
+const VERSION: &str = env!("CARGO_PKG_VERSION");
+
 #[tokio::main]
 async fn main() {
     let pg_url: String = env::var("PG_URL")
@@ -61,6 +63,7 @@ async fn main() {
         .route("/syncs/progress", put(update_progress))
         .route("/syncs/progress/{document}", get(get_progress))
         .route("/healthcheck", get(healthcheck))
+        .route("/version", get(version))
         .with_state(db_pool);
 
     // run it with hyper on localhost:3003
@@ -74,6 +77,10 @@ async fn root() -> &'static str {
     "KOreader sync server"
 }
 
+async fn version() -> &'static str {
+    VERSION
+}
+
 async fn create_user(
     State(db_pool): State<PgPool>,
     Json(payload): Json<User>,