func()

in client/client.go [213:260]

• 41 lines of code
• 14 McCabe index (conditional complexity)

func (hs *httpSource) GetByModule(ctx context.Context, module string) (_ []*osv.Entry, err error) {
	defer derrors.Wrap(&err, "GetByModule(%q)", module)

	index, err := hs.Index(ctx)
	if err != nil {
		return nil, err
	}

	lastModified, present := index[module]
	if !present {
		return nil, nil
	}

	if hs.cache != nil {
		if cached, err := hs.cache.ReadEntries(hs.dbName, module); err != nil {
			return nil, err
		} else if len(cached) != 0 {
			var stale bool
			for _, c := range cached {
				if c.Modified.Before(lastModified) {
					stale = true
					break
				}
			}
			if !stale {
				return cached, nil
			}
		}
	}

	content, err := hs.readBody(ctx, fmt.Sprintf("%s/%s.json", hs.url, module))
	if err != nil || content == nil {
		return nil, err
	}
	var e []*osv.Entry
	// TODO: we may want to check that the returned entries actually match
	// the module we asked about, so that the cache cannot be poisoned
	if err = json.Unmarshal(content, &e); err != nil {
		return nil, err
	}

	if hs.cache != nil {
		if err := hs.cache.WriteEntries(hs.dbName, module, e); err != nil {
			return nil, err
		}
	}
	return e, nil
}