prow/jenkins/jenkins.go
func NewClient(
	url string,
	dryRun bool,
	tlsConfig *tls.Config,
	authConfig *AuthConfig,
	logger *logrus.Entry,
	metrics *ClientMetrics,
) (*Client, error) {
	if logger == nil {
		logger = logrus.NewEntry(logrus.StandardLogger())
	}
	c := &Client{
		logger:     logger.WithField("client", "jenkins"),
		dryRun:     dryRun,
		baseURL:    url,
		authConfig: authConfig,
		client: &http.Client{
			Timeout: 30 * time.Second,
		},
		metrics: metrics,
	}
	if tlsConfig != nil {
		c.client.Transport = &http.Transport{TLSClientConfig: tlsConfig}
	}
	if c.authConfig.CSRFProtect {
		if err := c.CrumbRequest(); err != nil {
			return nil, fmt.Errorf("cannot get Jenkins crumb: %v", err)
		}
	}
	return c, nil
}
func NewClient(
	url string,
	dryRun bool,
	tlsConfig *tls.Config,
	authConfig *AuthConfig,
	logger *logrus.Entry,
	metrics *ClientMetrics,
) (*Client, error) {
	if logger == nil {
		logger = logrus.NewEntry(logrus.StandardLogger())
	}
	c := &Client{
		logger:     logger.WithField("client", "jenkins"),
		dryRun:     dryRun,
		baseURL:    url,
		authConfig: authConfig,
		client: &http.Client{
			Timeout: 30 * time.Second,
		},
		metrics: metrics,
	}
	if tlsConfig != nil {
		c.client.Transport = &http.Transport{TLSClientConfig: tlsConfig}
	}
	if c.authConfig.CSRFProtect {
		if err := c.CrumbRequest(); err != nil {
			return nil, fmt.Errorf("cannot get Jenkins crumb: %v", err)
		}
	}
	return c, nil
}
// NewClient instantiates a client with provided values.
//
// url: the jenkins master to connect to.
// dryRun: mutating calls such as starting/aborting a build will be skipped.
// tlsConfig: configures client transport if set, may be nil.
// authConfig: configures the client to connect to Jenkins via basic auth/bearer token
//             and optionally enables csrf protection
// logger: creates a standard logger if nil.
// metrics: gathers prometheus metrics for the Jenkins client if set.