flxzt/rnote · warning · anyhow::Error

Channel closed before receiving a response from dialog.

Error message

Channel closed before receiving a response from dialog.

What it means

Thrown when the password dialog's response channel closes before a response arrives, i.e. `rx.borrow_mut().recv()` in `dialog_import_pdf_w_prefs` returned None because the dialog's sender was dropped without the user answering. The function cannot proceed with import, so it errors instead of silently succeeding.

Solutions

Treat dialog dismissal (cancel/close) as a user-abort and return Ok(false) rather than an error, if abort is acceptable.
Ensure the dialog always emits a response signal on cancel and the channel sender outlives the dialog lifetime.
Retry the import flow by re-invoking the import; if persistent, check dialog construction/lifecycle code.
Log which dismissal path occurred to distinguish user cancel from unexpected teardown.

Example fix

// before
None => Err(anyhow::anyhow!("Channel closed before receiving a response from dialog.")),
// after
None => {
    tracing::debug!("PDF password dialog closed without a response; aborting import");
    Ok(false)
}

Defensive patterns

Strategy: fallback

Try / catch

match dialog_response {
    Some(pwd) => import_with_password(pwd),
    None => Ok(false), // treat as user abort
}

Prevention

Treat dialog dismissal as user cancellation, not a hard error
Ensure cancel/close also emits the response signal
Keep the response channel sender alive until the dialog is finalized

When it happens

Trigger: In `dialog_import_pdf_w_prefs`, the PDF password dialog is dismissed in a way that does not emit a response (window destroyed, dialog cancelled by shutdown, response sender dropped) so `pdf_password_dialog` future resolves to None.

Common situations: User closes the parent window while the password dialog is open; dialog cancelled programmatically; a bug where the dialog's FutureExt::map handling never forwards a response before teardown.

Related errors

AI-assisted analysis of flxzt/rnote@bbc5354502 (2026-09-08). Data as JSON: /api/errors/c5bd53d7bbf35270. Report an issue: GitHub.

Appendix: source

Thrown at crates/rnote-ui/src/dialogs/import.rs:564

                        if let Err(e) = tx_import.unbounded_send(Ok(true)) {
                            error!(
                                "PDF file imported, but failed to send signal through channel. Err: {e:?}"
                            );
                        }
                    }
                ));

                match rx_import.next().await {
                    Some(res) => res,
                    None => Err(anyhow::anyhow!(
                        "Channel closed before receiving a response from loader thread."
                    )),
                }
            } else {
                Ok(false)
            }
        }
        None => Err(anyhow::anyhow!(
            "Channel closed before receiving a response from dialog."
        )),
    }
}

/// Imports the file as Xopp with an import dialog.
///
/// Returns true when the file was imported, else false.
pub(crate) async fn dialog_import_xopp_w_prefs(
    appwindow: &RnAppWindow,
    canvas: &RnCanvas,
    input_file: gio::File,
) -> anyhow::Result<bool> {
    let builder = Builder::from_resource(
        (String::from(config::APP_IDPATH) + "ui/dialogs/import.ui").as_str(),
    );
    let dialog: adw::Dialog = builder.object("dialog_import_xopp_w_prefs").unwrap();
    let dpi_row: adw::SpinRow = builder.object("xopp_import_dpi_row").unwrap();

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