grwjs

var Exports = map[string]interface{}{
	"algorithms": grw.Algorithms,
	"schemes":    grw.Schemes,
	"read": func(uri string, alg string, options map[string]interface{}, callback func(...interface{}) *js.Object) {
		go func() {
			scheme, _ := splitter.SplitUri(uri)
			switch scheme {
			case grw.SchemeS3:
				s3Client, err := newS3Client(options)
				if err != nil {
					callback(nil, errors.Wrapf(err, "error creating s3 client").Error())
					return
				}
				reader, _, err := grw.ReadFromResource(uri, alg, 4096, s3Client)
				if err != nil {
					callback(nil, errors.Wrapf(err, "error opening reader for uri %q with compression algorithm %q", uri, alg).Error())
					return
				}
				callback(js.MakeWrapper(&Reader{Reader: reader}), nil)
			case grw.SchemeFile, grw.SchemeHTTP, grw.SchemeHTTPS, "":
				reader, _, err := grw.ReadFromResource(uri, alg, 4096, nil)
				if err != nil {
					callback(nil, errors.Wrapf(err, "error opening reader for uri %q with compression algorithm %q", uri, alg).Error())
					return
				}
				callback(js.MakeWrapper(&Reader{Reader: reader}), nil)
			default:
				callback(nil, fmt.Sprintf("error opening reader for uri %q: scheme %q is not supported", uri, scheme))
			}
		}()
	},
}