Function injectLiveReload

cli.go:31–113

injectLiveReload tries to check if this application runs under https://github.com/kataras/iris-cli and if so then it checks if the livereload is enabled and then injects the watch listener (js script) on every HTML response. It has a slight performance cost but this (iris-cli with watch and liverelo

(r Party)

//
// tryInjectLiveReload runs right before Build -> BuildRouter.
func injectLiveReload(r Party) (bool, error) {
	conf := struct {
		Running    bool `yaml:"Running,omitempty"`
		LiveReload struct {
			Disable bool `yaml:"Disable"`
			Port    int  `yaml:"Port"`
		} `yaml:"LiveReload"`
	}{}
	// defaults to disabled here.
	conf.LiveReload.Disable = true

	wd, err := os.Getwd()
	if err != nil {
		return false, err
	}

	for _, path := range []string{".iris.yml" /*, "../.iris.yml", "../../.iris.yml" */} {
		path = filepath.Join(wd, path)

		if _, err := os.Stat(path); err == nil {
			inFile, err := os.OpenFile(path, os.O_RDONLY, 0600)
			if err != nil {
				return false, err
			}

			dec := yaml.NewDecoder(inFile)
			err = dec.Decode(&conf)
			inFile.Close()
			if err != nil {
				return false, err
			}

			break
		}
	}

	if !conf.Running || conf.LiveReload.Disable {
		return false, nil
	}

	scriptReloadJS := []byte(fmt.Sprintf(`<script>(function () {
    const scheme = document.location.protocol == "https:" ? "wss" : "ws";
    const endpoint = scheme + "://" + document.location.hostname + ":%d/livereload";

    w = new WebSocket(endpoint);
    w.onopen = function () {
        console.info("LiveReload: initialization");
    };
    w.onclose = function () {
        console.info("LiveReload: terminated");
    };
    w.onmessage = function (message) {
        // NOTE: full-reload, at least for the moment. Also if backend changed its port then we will get 404 here. 
        window.location.reload();
    };
}());</script>`, conf.LiveReload.Port))

	bodyCloseTag := []byte("</body>")