@aligov/retcodelog/src/server-config.js

retcode log上报npm包,适用于 browser|nodejs|weex|E应用

/*
 *
 * return status
 * 0 -> need to load new version log
 * 1 -> need to load config
 * 2 -> latest version of config as well as log
 *
 */
module.exports = function (wpo) {
    var key = wpo._key,
        str, config, tag, url;

    var compareVer;

    var loadScript = function (url) {
        var scriptTag = document.createElement('script');

        scriptTag.src = url;
        document.getElementsByTagName('script')[0].parentNode.appendChild(scriptTag);
        return scriptTag;
    };

    var isReady,
        loadConfigByDomReady = function () {
            if (isReady) {
                return ;
            }
            isReady = true;
            loadConfig();
        };

    var loadConfig = function () {
        var url = '//retcode.alicdn.com/retcode/pro/config/' + wpo.getSpmId() + '.js',
            tag = loadScript(url);

        tag.onerror = function () {
            tag.onerror = null;
            wpo.error('sys', 'dynamic config error', url, 0);
            wpo.ready();
        };
    };

    var loadConfigWhenReady = function () {
        if (document.readyState === 'complete') {
            loadConfigByDomReady();
        }
        else if (document.addEventListener) {
            document.addEventListener('DOMContentLoaded', function () {
                document.removeEventListener('DOMContentLoaded', arguments.callee, false);
                loadConfigByDomReady();
            }, false);
        }
        else if (document.attachEvent) {
            document.attachEvent("onreadystatechange", function(){
                if ( document.readyState === "complete" ) {
                    document.detachEvent( "onreadystatechange", arguments.callee );
                    loadConfigByDomReady();
                }
            });

            if ( document.documentElement.doScroll && typeof window.frameElement === "undefined" ) (function(){
                try {
                    // If IE is used, use the trick by Diego Perini
                    // http://javascript.nwbox.com/IEContentLoaded/
                    document.documentElement.doScroll("left");
                } catch( error ) {
                    setTimeout( arguments.callee, 0 );
                    return;
                }
                // and execute any waiting functions
                loadConfigByDomReady();
            })();

            wpo.on(window, 'load', function () {
                loadConfigByDomReady();
            }, true);
        }
    }

    //
    // key has been overriden
    //
    if (!key) {
        return 2;
    }

    try {
        str = localStorage.getItem(key);
    }
    catch (e) {
        str = wpo.getCookie(key);
    }

    if (!str) {
        loadConfigWhenReady();
        return 1;
    }
    else {
        config = wpo.query.parse(str);

        //
        // current ver is behind dynamic ver
        //
        selfUpdate = function () {
            var versions = wpo.ver && wpo.ver.split('.'),
                compareVersions = config.ver && config.ver.split('.');

            //
            // force not updating
            //
            if (!versions || !compareVersions) {
                return false;
            }

            for (var i = 0, len = versions.length; i < len; i++) {
                if (compareVersions[i]) {
                    if (parseInt(versions[i], 10) < parseInt(compareVersions[i], 10)) {
                        return true;
                    }
                }
            }

            return false;
        };
        //
        // 动态更新脚本自己
        //
        if (selfUpdate()) {
            // url = '//g-assets.daily.taobao.net/retcode/retcodelog/' + config.ver + '/log.js';
            url = '//g.alicdn.com/retcode/log/' + config.ver + '/log.js';
            tag = loadScript(url);
            tag.onload = function () {
                tag.onload = null;
                wpo.reloaded();
            };
            tag.onerror = function () {
                tag.onerror = null;
                wpo.error('sys', 'self update error', url, 0);
                wpo.reloadFailed();
            };
            return 0;
        }
        //
        // 从localstorage里读取数据
        //
        else if (parseInt(config.exp, 10) < (new Date()).getTime()) {
            loadConfigWhenReady();
            return 1;
        }

        wpo.setConfig({
            sample: parseInt(config.sample, 10)
        });
    }

    return 2;
};