crowdsecurity/crowdsec · error

while downloading data for %s: %w

Error message

while downloading data for %s: %w

What it means

DownloadDataIfNeeded calls downloadDataSet to fetch and decode the remote data associated with a hub item. Any failure inside that download/decode pipeline is wrapped as 'while downloading data for %s: %w', identifying the item by its local path.

Source

Thrown at pkg/hubops/datarefresh.go:23

	"fmt"
	"os"

	"github.com/crowdsecurity/crowdsec/pkg/cwhub"
)

// XXX: TODO: temporary for hubtests, but will have to go.
// DownloadDataIfNeeded downloads the data set for the item.
func DownloadDataIfNeeded(ctx context.Context, hub *cwhub.Hub, item *cwhub.Item, force bool) (bool, error) {
	itemFile, err := os.Open(item.State.LocalPath)
	if err != nil {
		return false, fmt.Errorf("while opening %s: %w", item.State.LocalPath, err)
	}

	defer itemFile.Close()

	needReload, err := downloadDataSet(ctx, hub.GetDataDir(), force, itemFile)
	if err != nil {
		return needReload, fmt.Errorf("while downloading data for %s: %w", item.State.LocalPath, err)
	}

	return needReload, nil
}

// DataRefreshCommand updates the data files associated with the installed hub items.
type DataRefreshCommand struct {
	Force bool
}

func NewDataRefreshCommand(force bool) *DataRefreshCommand {
	return &DataRefreshCommand{Force: force}
}

func (*DataRefreshCommand) Prepare(_ *ActionPlan) (bool, error) {
	// we can't prepare much at this point because we don't know which data files yet,
	// and items needs to be downloaded/updated
	// evertyhing will be done in Run()

View on GitHub (pinned to 909b515798)

Solutions

1. Run 'cscli hub update' to refresh item metadata and data URLs
2. Check network connectivity to the data source URL
3. Inspect the wrapped inner error for the root cause (HTTP status vs decode error)
4. Reinstall the item to reset its data source configuration

Example fix

// before
needReload, err := hubops.DownloadDataIfNeeded(ctx, hub, item, force)
if err != nil { log.Fatal(err) }
// after
needReload, err := hubops.DownloadDataIfNeeded(ctx, hub, item, force)
if err != nil {
    log.Warnf("data refresh failed for %s: %v; will retry", item.FQName(), err)
}

resp, err := http.Head(dataURL)
if err != nil || resp.StatusCode != http.StatusOK { return fmt.Errorf("data source unavailable: %s", dataURL) }

needReload, err := hubops.DownloadDataIfNeeded(ctx, hub, item, force)
if err != nil {
    return retry.WithBackoff(ctx, 3, func() error {
        _, err := hubops.DownloadDataIfNeeded(ctx, hub, item, force)
        return err
    })
}

When it happens

Trigger: Calling DownloadDataIfNeeded when the upstream data download fails: bad URL, network outage, HTTP error, or malformed/undecodable data content.

Common situations: Upstream data source (e.g. blocklist provider) is down or moved its URL; network egress blocked in the deployment; the item's data file format changed and decoding fails.

Understand the failure class

Background: 'Something went wrong' / 'Request failed (500)' / 'HTTP error! status: 404' — what failed HTTP requests actually mean and how to find the real cause — this error's family across 28 libraries.

Related errors

• while getting data: %w
• unable to download data for parser '%s': %w
• failed to parse URL: %w
• failed to build hub index request: %w
• failed to build request: %w

AI-assisted analysis of crowdsecurity/crowdsec@909b515798 (2026-09-06). Data as JSON: /api/errors/76b401b04548476f. Report an issue: GitHub.