What causes "Download cancelled" in tonhowtf/omniget?

Handle this message as normal user cancellation — stop and return silently rather than surfacing an error.

Download cancelled

Error message

Download cancelled

What it means

magnet.rs throws this in the download wait loop when the cancel token fires while the torrent is downloading. The select branch logs 'download cancelled', attempts to delete the torrent from the session (best-effort, failure only logged), and then bails with 'Download cancelled'. It is expected cancellation, not a torrent error.

Solutions

Handle this message as normal user cancellation — stop and return silently rather than surfacing an error.
If cancellation was unintended, trace who fired cancel_rx (UI, timeout, shutdown) for this download id.
Verify the follow-up session.delete on cancel succeeded (a warn log 'failed to delete torrent on cancel' means cleanup leaked).
Prefer a typed cancellation signal over string-matching the error message in calling code.

Defensive patterns

Strategy: try-catch

Try / catch

Err(e) if e.to_string() == "Download cancelled" => {
    // normal path: torrent already deleted by the library; return quietly
    Ok(DownloadOutcome::Cancelled)
}

Prevention

Use per-download tokens scoped to one attempt only
Confirm the 'failed to delete torrent on cancel' warn is absent so state doesn't leak
Surface cancellation as a status, not an error, in the UI

When it happens

Trigger: In the tokio::select! over progress/completion/cancel, `_ = cancel_rx.cancelled()` triggers at magnet.rs:266; the torrent (torrent_id) is deleted via session_for_cancel.delete(TorrentIdOrHash::Id(...), false) before bailing.

Common situations: User cancels a slow torrent download; app shutdown; the download manager cancels and re-queues a torrent; stalled torrent causes a supervisor to cancel the attempt.

Related errors

AI-assisted analysis of tonhowtf/omniget@8600b91f42 (2026-09-12). Data as JSON: /api/errors/9bfe0f622e892cf5. Report an issue: GitHub.

Appendix: source

Thrown at src-tauri/omniget-core/src/platforms/magnet.rs:266

                            "[magnet] progress: {:.1}% ({:.1} MB / {:.1} MB)",
                            pct,
                            downloaded as f64 / 1_048_576.0,
                            total as f64 / 1_048_576.0,
                        );
                        // Fallback: detect completion from stats when
                        // wait_until_completed() doesn't resolve
                        if downloaded >= total {
                            tracing::info!("[magnet] download complete from stats (id={})", torrent_id);
                            break;
                        }
                    }
                }
                _ = cancel_rx.cancelled() => {
                    tracing::info!("[magnet] download cancelled, removing torrent id={}", torrent_id);
                    if let Err(e) = session_for_cancel.delete(TorrentIdOrHash::Id(torrent_id), false).await {
                        tracing::warn!("[magnet] failed to delete torrent on cancel: {}", e);
                    }
                    anyhow::bail!("Download cancelled");
                }
                res = &mut completion => {
                    if let Err(e) = res {
                        anyhow::bail!("Torrent download failed: {}", e);
                    }
                    let _ = progress.send(ProgressUpdate::percent(100.0)).await;
                    tracing::info!("[magnet] download complete (id={})", torrent_id);
                    break;
                }
            }
        }

        let (total_size, torrent_name) = managed_torrent
            .with_metadata(|meta| {
                let size = meta
                    .info
                    .iter_file_lengths()
                    .ok()

View on GitHub (pinned to 8600b91f42)