Use web::block in post_comment

src/main.rs

@@ -19,12 +19,22 @@ struct AppState {
     arguments: Arguments,
 }
 
+// TODO: Make error handling system not bad.
+// Currently, it's a horrible mix of custom error types a direct HttpResponses,
+// due to not being able to pass HttpResponse out of web::block...
+// Well, it works, at least.
+
 enum DatabaseAccessError {
     BadOrigin,
     AccessError,
     DatabaseError,
 }
 
+enum CommentCreationError {
+    DatabaseAccessError(DatabaseAccessError),
+    BadParent,
+}
+
 impl DatabaseAccessError {
     fn to_http_response(&self) -> HttpResponse {
         match self {
@@ -39,6 +49,15 @@ impl DatabaseAccessError {
     }
 }
 
+impl CommentCreationError {
+    fn to_http_response(&self) -> HttpResponse {
+        match self {
+            Self::DatabaseAccessError(error) => error.to_http_response(),
+            Self::BadParent => HttpResponse::BadRequest().reason("invalid comment parent").finish(),
+        }
+    }
+}
+
 impl AppState {
     fn get_db<'a>(
         &'a self,
@@ -183,13 +202,8 @@ async fn post_comment(
             if comment.email.is_none() && data.arguments.email_required {
                 return HttpResponse::BadRequest().reason("email required").finish();
             }
-            let origin = match request.head().headers().get("Origin") {
-                Some(origin) => match origin.to_str() {
-                    Ok(origin) => origin,
-                    // If the Origin is not valid ASCII, it is a bad request not sent from a browser
-                    Err(_) => return HttpResponse::BadRequest().reason("bad origin").finish(),
-                },
-                // If there is no Origin header, it is a bad request not sent from a browser
+            let origin = match get_request_origin(&request) {
+                Some(origin) => origin,
                 None => return HttpResponse::BadRequest().reason("bad origin").finish(),
             };
             // Check to see if provided URL is in scope.
@@ -198,7 +212,7 @@ async fn post_comment(
             // https://github.com/rust-lang/rust/issues/48594
             'outer: loop {
                 for site_root in data.databases.keys() {
-                    if site_root.starts_with(origin) && url.starts_with(site_root) {
+                    if site_root.starts_with(&origin) && url.starts_with(site_root) {
                         break 'outer;
                     }
                 }
@@ -223,40 +237,40 @@ async fn post_comment(
                         .finish()
                 }
             };
-            let database = match data.get_db(&request) {
-                Ok(database) => database,
-                Err(err) => return err.to_http_response(),
-            };
-            if let Some(parent) = comment.parent {
-                'outer2: loop {
-                    match database.get_comments(&comment.content_id) {
-                        Ok(comments) => {
-                            for other_comment in comments.iter() {
-                                if other_comment.id.unwrap() == parent {
-                                    if other_comment.parent.is_none() {
-                                        break 'outer2;
+            match web::block(move || {
+                let database = match data.get_db_with_origin(Some(origin)) {
+                    Ok(database) => database,
+                    Err(err) => return Err(CommentCreationError::DatabaseAccessError(err)),
+                };
+                if let Some(parent) = comment.parent {
+                    'outer2: loop {
+                        match database.get_comments(&comment.content_id) {
+                            Ok(comments) => {
+                                for other_comment in comments.iter() {
+                                    if other_comment.id.unwrap() == parent {
+                                        if other_comment.parent.is_none() {
+                                            break 'outer2;
+                                        }
+                                        break;
                                     }
-                                    break;
                                 }
                             }
-                        }
-                        Err(_) => {
-                            return HttpResponse::InternalServerError()
-                                .reason("failed to get comments")
-                                .finish()
-                        }
+                            Err(_) => return Err(CommentCreationError::DatabaseAccessError(DatabaseAccessError::DatabaseError)),
+                        };
+                        return Err(CommentCreationError::BadParent);
                     }
-                    return HttpResponse::BadRequest()
-                        .reason("invalid comment parent")
-                        .finish();
                 }
+                if let Err(_) = database.create_comment(&comment) {
+                    return Err(CommentCreationError::DatabaseAccessError(DatabaseAccessError::DatabaseError));
+                }
+                Ok(())
+            }).await {
+                Ok(result) => match result {
+                    Ok(_) => HttpResponse::Ok().into(),
+                    Err(error) => error.to_http_response(),
+                },
+                Err(_) => DatabaseAccessError::AccessError.to_http_response(),
             }
-            if let Err(_) = database.create_comment(&comment) {
-                return HttpResponse::InternalServerError()
-                    .reason("failed to create comment")
-                    .finish();
-            }
-            HttpResponse::Ok().into()
         }
         Err(_) => HttpResponse::BadRequest()
             .reason("failed to parse request body")