Golang Interface.Info方法代碼示例

// Selfupdate runs a self-update for the current binary
func Selfupdate(ctx log.Interface, component string) {
	if viper.GetString("gitBranch") == "unknown" {
		ctx.Infof("You are not using an official %s build. Not proceeding with the update", component)
		return
	}

	info, err := GetLatestInfo()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get version information from the server")
	}

	if viper.GetString("gitCommit") == info.Commit {
		ctx.Info("The git commit of the build on the server is the same as yours")
		ctx.Info("Not proceeding with the update")
		return
	}

	if date, err := time.Parse(time.RFC3339, viper.GetString("buildDate")); err == nil {
		if date.Equal(info.Date) {
			ctx.Infof("You have the latest version of %s", component)
			ctx.Info("Nothing to update")
			return
		}
		if date.After(info.Date) {
			ctx.Infof("Your build is %s newer than the build on the server", date.Sub(info.Date))
			ctx.Info("Not proceeding with the update")
			return
		}
		ctx.Infof("The build on the server is %s newer than yours", info.Date.Sub(date))
	}

	ctx.Infof("Downloading the latest %s...", component)
	binary, err := GetLatest(component)
	if err != nil {
		ctx.WithError(err).Fatal("Could not download latest binary")
	}
	filename, err := osext.Executable()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get path to local binary")
	}
	stat, err := os.Stat(filename)
	if err != nil {
		ctx.WithError(err).Fatal("Could not stat local binary")
	}
	ctx.Info("Replacing local binary...")
	if err := ioutil.WriteFile(filename+".new", binary, stat.Mode()); err != nil {
		ctx.WithError(err).Fatal("Could not write new binary to filesystem")
	}
	if err := os.Rename(filename, filename+".old"); err != nil {
		ctx.WithError(err).Fatal("Could not rename binary")
	}
	if err := os.Rename(filename+".new", filename); err != nil {
		ctx.WithError(err).Fatal("Could not rename binary")
	}
	ctx.Infof("Updated %s to the latest version", component)
}

// continue looking at dns entry for changes in config
func configLoop(ctx log.Interface, cfgURL string) {
	ticker := time.Tick(15 * time.Second)

	for {
		select {
		case <-ticker:
			newIPs, err := dnscfg.Get(dnsAddr, ldPort)
			if err != nil {
				ctx.WithError(err).Error("dns lookup")
				continue
			}

			if len(newIPs) == 0 {
				ctx.Error("no ip addresses found")
				continue
			}

			oldIPs, err := httpcfg.Get(cfgURL)
			if err != nil {
				ctx.WithError(err).Error("getting config")
				continue
			}

			if eq(newIPs, oldIPs) {
				ctx.Info("config up to date")
				continue
			}

			err = httpcfg.Set(cfgURL, newIPs)
			if err != nil {
				ctx.WithError(err).Error("setting config")
				continue
			}

			ctx.WithField("ips", newIPs).Info("setting config")
		}
	}
}

// GetRouter starts a connection with the router
func GetRouter(ctx log.Interface) (*grpc.ClientConn, router.RouterClient) {
	ctx.Info("Discovering Router...")
	dscConn, client := GetDiscovery(ctx)
	defer dscConn.Close()
	routerAnnouncement, err := client.Get(GetContext(ctx), &discovery.GetRequest{
		ServiceName: "router",
		Id:          viper.GetString("router-id"),
	})
	if err != nil {
		ctx.WithError(errors.FromGRPCError(err)).Fatal("Could not get Router from Discovery")
	}
	ctx.Info("Connecting with Router...")
	rtrConn, err := routerAnnouncement.Dial()
	ctx.Info("Connected to Router")
	rtrClient := router.NewRouterClient(rtrConn)
	return rtrConn, rtrClient
}