使用Jscex改进Node Club（4）：改写首页

原文链接

tag_ctrl.get_all_tags(function (err, tags) { ... });
topic_ctrl.get_topics_by_query(..., function (err, topics) { ... });
topic_ctrl.get_topics_by_query(..., function (err, hot_topics) { ... });
user_ctrl.get_users_by_query(..., function (err, users) { ... });
user_ctrl.get_users_by_query(..., function (err, tops) { ... });
topic_ctrl.get_topics_by_query(..., function (err, no_reply_topics) { ... });
topic_ctrl.get_count_by_query(..., function (err, all_topics_count) { ... });

/********** Jscex ************/
var Jscex = require("../libs/jscex").Jscex;
var Jscexify = Jscex.Async.Jscexify;

exports.get_topics_by_query_async = Jscexify.fromStandard(get_topics_by_query);
exports.get_count_by_query_async = Jscexify.fromStandard(get_count_by_query);

function (request, response) {
    var tags = tag_ctrl.get_all_tags(); // 标签
    var topics = topic_ctrl.get_topics_by_query(...); // 最新话题
    var hot_topics = topic_ctrl.get_topics_by_query(...); // 热门话题
    var stars = user_ctrl.get_topics_by_query(...); // 明星用户
    var tops = user_ctrl.get_users_by_query(...); // 得分最高用户
    var no_reply_topics = topic_ctrl.get_topics_by_query(...); // 无回复话题
    var topic_count = topic_ctrl.get_count_by_query(...); // 话题总数

    response.render("index", { ... }); // 输出HTML
}

var indexAsync = eval(Jscex.compile("async", function (req, res) {
    var page = Number(req.query.page) || 1;
    var limit = config.list_topic_count;

    var data = {
        current_page: page,
        list_topic_count: limit
    };

    data.topics = $await(topic_ctrl.get_topics_by_query_async(...));

    data.hot_topics = $await(topic_ctrl.get_topics_by_query_async(...));

    data.stars = $await(user_ctrl.get_users_by_query_async(...));

    data.tops = $await(user_ctrl.get_users_by_query_async(...));

    data.no_reply_topics = $await(topic_ctrl.get_topics_by_query_async(...));

    var all_topics_count = $await(topic_ctrl.get_count_by_query_async(...));
    data.pages = Math.ceil(all_topics_count / limit);

    data.tags = $await(tag_ctrl.get_all_tags_async());

    // 计算最热标签
    data.hot_tags = _.chain(data.tags)
        .sortBy(function (t) { return -t.topic_count; })
        .first(5);

    // 计算最新标签
    data.recent_tags = _.chain(data.tags)
        .sortBy(function (t) { return -t.create_at.valueOf() })
        .first(5);

    res.render('index', data);
}));

exports.index = Unjscexify.toRequestHandler(indexAsync);

Jscex.Unjscexify = {
    toRequestHandler: function (fn) {
        return function (req, res, next) {
            fn(req, res).addEventListener("failure", function () {
                next(this.error);
            }).start();
        }
    }
}

tags.sort(function (tag_a, tag_b) {
    if (tag_a.topic_count == tag_b.topic_count) return 0;
    if (tag_a.topic_count > tag_b.topic_count) return -1;
    if (tag_a.topic_count < tag_b.topic_count) return 1;
});

tags.sort(function (tag_a, tag_b) {
    return tag_b.topic_count - tag_a.topic_count;
});

var indexAsync = eval(Jscex.compile("async", function (req, res) {
    var page = Number(req.query.page) || 1;
    var limit = config.list_topic_count;

    var data = $await(Task.whenAll({
        topics: topic_ctrl.get_topics_by_query_async({}, {
            skip: (page - 1) * limit,
            limit: limit,
            sort: [['last_reply_at', 'desc']]
        }),
        hot_topics: topic_ctrl.get_topics_by_query_async({}, {
            limit: 5,
            sort: [['visit_count', 'desc']]
        }),
        stars: user_ctrl.get_users_by_query_async(
            { is_star: true },
            { limit: 5 }
        ),
        tops: user_ctrl.get_users_by_query_async({}, {
            limit: 10,
            sort: [['score', 'desc']]
        }),
        no_reply_topics: topic_ctrl.get_topics_by_query_async(
            { reply_count: 0 },
            { limit: 5, sort: [['create_at', 'desc']] }
        ),
        tags: tag_ctrl.get_all_tags_async(),
        all_topics_count: topic_ctrl.get_count_by_query_async({})
    }));

    data.current_page = page;
    data.list_topic_count = limit;
    data.pages = Math.ceil(data.all_topics_count / limit);

    // 计算最热标签
    data.hot_tags = _.chain(data.tags)
        .sortBy(function (t) { return -t.topic_count; })
        .first(5);

    // 计算最新标签
    data.recent_tags = _.chain(data.tags)
        .sortBy(function (t) { return -t.create_at.valueOf() })
        .first(5);

    res.render('index', data);
}))