glanceapp/glance · error

%w: %v

Error message

%w: %v

What it means

Returned by the videos widget when the worker pool itself failed before any per-request results existed (workerPoolDo returned a non-nil err). The message wraps errNoContent, so the widget is treated as having no content to render rather than crashing the page.

Source

Thrown at internal/glance/widget-videos.go:163

		var feedUrl string
		if strings.HasPrefix(channelOrPlaylistIDs[i], videosWidgetPlaylistPrefix) {
			feedUrl = "https://www.youtube.com/feeds/videos.xml?playlist_id=" +
				strings.TrimPrefix(channelOrPlaylistIDs[i], videosWidgetPlaylistPrefix)
		} else if !includeShorts && strings.HasPrefix(channelOrPlaylistIDs[i], "UC") {
			playlistId := strings.Replace(channelOrPlaylistIDs[i], "UC", "UULF", 1)
			feedUrl = "https://www.youtube.com/feeds/videos.xml?playlist_id=" + playlistId
		} else {
			feedUrl = "https://www.youtube.com/feeds/videos.xml?channel_id=" + channelOrPlaylistIDs[i]
		}

		request, _ := http.NewRequest("GET", feedUrl, nil)
		requests = append(requests, request)
	}

	job := newJob(decodeXmlFromRequestTask[youtubeFeedResponseXml](defaultHTTPClient), requests).withWorkers(30)
	responses, errs, err := workerPoolDo(job)
	if err != nil {
		return nil, fmt.Errorf("%w: %v", errNoContent, err)
	}

	videos := make(videoList, 0, len(channelOrPlaylistIDs)*15)
	var failed int

	for i := range responses {
		if errs[i] != nil {
			failed++
			slog.Error("Failed to fetch youtube feed", "channel", channelOrPlaylistIDs[i], "error", errs[i])
			continue
		}

		response := responses[i]

		for j := range response.Videos {
			v := &response.Videos[j]
			var videoUrl string

View on GitHub (pinned to 91324e8de7)

Solutions

1. Check surrounding logs for the underlying %v cause printed in the message
2. Restart the Glance process to clear stuck worker state
3. Reduce concurrent load (fewer channels or longer cache) if the host is resource-constrained

func isNoContent(err error) bool { return errors.Is(err, errNoContent) }

videos, err := widget.getVideos()
if errors.Is(err, errNoContent) {
    // render the widget's empty/no-content state rather than failing the page
    renderNoContent()
    return nil
}

When it happens

Trigger: workerPoolDo fails outright — e.g. all 30 workers unable to start/finish the batch — before individual youtube.com/feeds/videos.xml requests are even attempted; distinct from per-feed errs[] entries which are counted as 'failed'.

Common situations: System resource exhaustion (goroutine/thread limits in a tight container) or an internal pool misconfiguration; effectively a rare infrastructure failure, not a config error.

Related errors

• %w: missing videos from %d channels
• no categories could be retrieved
• failed to retrieve any content
• widget 'type' property is empty or not specified
• %s widget: %v

AI-assisted analysis of glanceapp/glance@91324e8de7 (2026-08-15). Data as JSON: /api/errors/123f981cc3fe1fe5. Report an issue: GitHub.