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: update_release.go
    path of file: ./repos/ngrok/src/ngrok/client
    
    the code of the file until where you have to start completion: // +build release autoupdate

package client

import (
	"ngrok/client/mvc"
	"ngrok/log"
	"ngrok/version"
	"time"

	"gopkg.in/inconshreveable/go-update.v0"
	"gopkg.in/inconshreveable/go-update.v0/check"
)

const (
	appId          = "ap_pJSFC5wQYkAyI0FIVwKYs9h1hW"
	updateEndpoint = "https://api.equinox.io/1/Updates"
)

const publicKey = `-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0Gx8r9no1QBtCruJW2tu
082MJJ5ZA7k803GisR2c6WglPOD1b/+kUg+dx5Y0TKXz+uNlR3GrCxLh8WkoA95M
T38CQldIjoVN/bWP6jzFxL+6BRoKy5L1TcaIf3xb9B8OhwEq60cvFy7BBrLKEHJN
ua/D1S5axgNOAJ8tQ2w8gISICd84ng+U9tNMqIcEjUN89h3Z4zablfNI
    
func autoUpdate(s mvc.State, token string) {
	up, err := update.New().VerifySignatureWithPEM([]byte(publicKey))
	if err != nil {
		log.Error("Failed to create update with signature: %v", err)
		return
	}

	update := func() (tryAgain bool) {
		log.Info("Checking for update")
		params := check.Params{
			AppId:      appId,
			AppVersion: version.MajorMinor(),
			UserId:     token,
		}

		result, err := params.CheckForUpdate(updateEndpoint, up)
		if err == check.NoUpdateAvailable {
			log.Info("No update available")
			return true
		} else if err != nil {
			log.Error("Error while checking for update: %v", err)
			return true
		}

		if result.Initiative == check.INITIATIVE_AUTO {
			if err := up.CanUpdate(); err != nil {
				log.Error("Can't update: insufficient permissions: %v", err)
				// tell the user to update manually
				s.SetUpdateStatus(mvc.UpdateAvailable)
			} else {
				applyUpdate(s, result)
			}
		} else if result.Initiative == check.INITIATIVE_MANUAL {
			// this is the way the server tells us to update manually
			log.Info("Server wants us to update manually")
			s.SetUpdateStatus(mvc.UpdateAvailable)
		} else {
			log.Info("Update available, but ignoring")
		}

		// stop trying after a single download attempt
		// XXX: improve this so the we can:
		// 1. safely update multiple times
		// 2. only retry after temporary errors
		return false
	}

	// try to update immediately and then at a set interval
	for {
		if tryAgain := update(); !tryAgain {
			break
		}

		time.Sleep(updateCheckInterval)
	}
}