astral-sh/ruff · error · ruff_server::server::api::Error

-32603

-32603

Error message

Request handler failed

What it means

Error "Request handler failed" thrown in astral-sh/ruff.

Source

Thrown at crates/ruff_server/src/server/api.rs:222

        Box<dyn std::any::Any + Send + 'static>,
    >,
) -> Result<<<R as RequestHandler>::RequestType as Request>::Result>
where
    R: RequestHandler,
{
    match result {
        Ok(response) => response,

        Err(error) => {
            let message = if let Some(panic_message) = panic_message(&error) {
                format!("Request handler failed with: {panic_message}")
            } else {
                "Request handler failed".into()
            };

            Err(Error {
                code: lsp_server::ErrorCode::InternalError,
                error: anyhow!(message),
            })
        }
    }
}

fn sync_notification_task<N: SyncNotificationHandler>(notif: server::Notification) -> Result<Task> {
    let (id, params) = cast_notification::<N>(notif)?;
    Ok(Task::sync(move |session, client| {
        let _span = tracing::debug_span!("notification", method = %N::METHOD).entered();
        if let Err(err) = N::run(session, client, params) {
            tracing::error!("An error occurred while running {id}: {err}");
            client
                .show_error_message("Ruff encountered a problem. Check the logs for more details.");
        }
    }))
}

#[expect(dead_code)]

View on GitHub (pinned to 672bb4edf0)

When it happens

Trigger: Thrown at crates/ruff_server/src/server/api.rs:222 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astral-sh/ruff@672bb4edf0 (2026-08-16). Data as JSON: /api/errors/a5312921323d5827. Report an issue: GitHub.