You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: xray.go
    path of file: ./repos/goa/middleware/xray
    
    the code of the file until where you have to start completion: // Package xray contains the AWS X-Ray segment document type populated by the
// transport-specific X-Ray middleware.
package xray

import 
    
func Connect(ctx context.Context, renewPeriod time.Duration, dial func() (net.Conn, error)) (func() net.Conn, error) {
	var (
		err error

		// guard access to c
		mu sync.RWMutex
		c  net.Conn
	)

	// get an initial connection
	if c, err = dial(); err != nil {
		return nil, err
	}

	// periodically re-dial
	go func() {
		ticker := time.NewTicker(renewPeriod)
		for {
			select {
			case <-ticker.C:
				newConn, err := dial()
				if err != nil {
					continue // we don't have anything better to replace `c` with
				}
				mu.Lock()
				c = newConn
				mu.Unlock()
			case <-ctx.Done():
				return
			}
		}
	}()

	return func() net.Conn {
		mu.RLock()
		defer mu.RUnlock()
		return c
	}, nil
}