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: session.go
    path of file: ./repos/teller/vendor/github.com/hashicorp/consul/api
    
    the code of the file until where you have to start completion: package api

import (
	"errors"
	"fmt"
	"time"
)

const (
	// SessionBehaviorRelease is the default behavior and causes
	// all associated locks to be released on session invalidation.
	SessionBehaviorRelease = "release"

	// SessionBehaviorDelete is new in Consul 0.5 and changes the
	// behavior to delete all associated locks on session invalidation.
	//
    
func (s *Session) Renew(id string, q *WriteOptions) (*SessionEntry, *WriteMeta, error) {
	r := s.c.newRequest("PUT", "/v1/session/renew/"+id)
	r.setWriteOptions(q)
	rtt, resp, err := s.c.doRequest(r)
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	wm := &WriteMeta{RequestTime: rtt}

	if resp.StatusCode == 404 {
		return nil, wm, nil
	} else if resp.StatusCode != 200 {
		return nil, nil, fmt.Errorf("Unexpected response code: %d", resp.StatusCode)
	}

	var entries []*SessionEntry
	if err := decodeBody(resp, &entries); err != nil {
		return nil, nil, fmt.Errorf("Failed to read response: %v", err)
	}
	if len(entries) > 0 {
		return entries[0], wm, nil
	}
	return nil, wm, nil
}