Simplify the Inbox trait

If we want to add, for instance, streams in the future, we could introduce
a new trait for that, similar to FromActivity or Notify

We also display inbox errors to the "client" if something fails,
which could be useful for debugging.

src/routes/comments.rs

@@ -44,7 +44,8 @@ fn create_response(blog_name: String, slug: String, query: Option<CommentQuery>,
         .create(&*conn);
 
     let instance = Instance::get_local(&*conn).unwrap();
-    instance.received(&*conn, serde_json::to_value(new_comment.clone()).expect("JSON serialization error"));
+    instance.received(&*conn, serde_json::to_value(new_comment.clone()).expect("JSON serialization error"))
+        .expect("We are not compatible with ourselve: local broadcast failed (new comment)");
     broadcast(&user, new_comment, user.get_followers(&*conn));
 
     Redirect::to(format!("/~/{}/{}/#comment-{}", blog_name, slug, id))

src/routes/instance.rs

@@ -35,8 +35,13 @@ fn index(conn: DbConn, user: Option<User>) -> Template {
 fn shared_inbox(conn: DbConn, data: String) -> String {
     let act: serde_json::Value = serde_json::from_str(&data[..]).unwrap();
     let instance = Instance::get_local(&*conn).unwrap();
-    instance.received(&*conn, act);
-    String::from("")
+    match instance.received(&*conn, act) {
+        Ok(_) => String::new(),
+        Err(e) => {
+            println!("Shared inbox error: {}\n{}", e.cause(), e.backtrace());
+            format!("Error: {}", e.cause())
+        }
+    }
 }
 
 #[get("/nodeinfo")]

src/routes/user.rs

@@ -199,8 +199,13 @@ fn outbox(name: String, conn: DbConn) -> ActivityStream<OrderedCollection> {
 fn inbox(name: String, conn: DbConn, data: String) -> String {
     let user = User::find_local(&*conn, name).unwrap();
     let act: serde_json::Value = serde_json::from_str(&data[..]).unwrap();
-    user.received(&*conn, act);
-    String::from("")
+    match user.received(&*conn, act) {
+        Ok(_) => String::new(),
+        Err(e) => {
+            println!("User inbox error: {}\n{}", e.cause(), e.backtrace());
+            format!("Error: {}", e.cause())
+        }
+    }
 }
 
 #[get("/@/<name>/followers", format = "application/activity+json")]