带有YQL的jQuery RSS随机返回null

时间:2016-04-02 08:41:30

标签: jquery ajax xml rss yql

我使用FeedEk插件为jQuery使用YQL API,尝试显示三个RSS提要。

大部分时间情况都还可以,但每隔一段时间我就会从三个Feed中的一个获得results: null,但通常会调用第二个和第三个,很少是第一个。我已经检查了Feed本身并且没有显示任何问题,我也在Yahoo控制台上对其进行了测试,但它没有显示问题。 这不是通话限制问题,因为我在测试时每天几乎没有从我的IP拨打300个电话。

我启用了诊断功能,我唯一看到的与result: null Feed不同的是info部分Using encoding from response content-type header (UTF-8) as XML document does not specify encoding.

中有以下消息

以下是我正在制作的电话

SELECT channel.item FROM feednormalizer WHERE output="rss_2.0" AND url ="http://feeds.arstechnica.com/arstechnica/index" LIMIT 8

这是插件代码

/*
* FeedEk jQuery RSS/ATOM Feed Plugin v3.0 with YQL API (Engin KIZIL http://www.enginkizil.com)
* http://jquery-plugins.net/FeedEk/FeedEk.html  https://github.com/enginkizil/FeedEk
* Author : Engin KIZIL http://www.enginkizil.com
*/

(function ($) {
    $.fn.FeedEk = function (opt) {
        var def = $.extend({
            MaxCount: 5,
            ShowDesc: true,
            ShowPubDate: true,
            DescCharacterLimit: 0,
            TitleLinkTarget: "_blank",
            DateFormat: "",
            DateFormatLang:"en"
        }, opt);

        var id = $(this).attr("id"), i, s = "", dt;
        $("#" + id).empty();
        if (def.FeedUrl == undefined) return;
        $("#" + id).append('<div style="width:100%;text-align:center;color:#424242;"><div class="loader"></div></div>');

        var YQLstr = 'SELECT channel.item FROM feednormalizer WHERE output="rss_2.0" AND url ="' + def.FeedUrl + '" LIMIT ' + def.MaxCount;

        $.ajax({
            url: "https://query.yahooapis.com/v1/public/yql?q=" + encodeURIComponent(YQLstr) + "&format=json&diagnostics=true&callback=?",
            dataType: "json",
            success: function (data) {
                $("#" + id).empty();
                if (!(data.query.results.rss instanceof Array)) {
                    data.query.results.rss = [data.query.results.rss];
                }
                $.each(data.query.results.rss, function (e, itm) {
                    s += '<li><div class="itemTitle">' + itm.channel.item.title + '</div>';

                    if (def.ShowPubDate){
                        dt = new Date(itm.channel.item.pubDate);
                        s += '<div class="itemDate">';
                        if ($.trim(def.DateFormat).length > 0) {
                            try {
                                moment.lang(def.DateFormatLang);
                                s += moment(dt).format(def.DateFormat);
                            }
                            catch (e){s += dt.toLocaleDateString();}
                        }
                        else {
                            s += dt.toLocaleDateString();
                        }
                        s += '</div>';
                    }
                    if (def.ShowDesc) {
                        s += '<div class="itemContent">';
                         if (def.DescCharacterLimit > 0 && itm.channel.item.description.length > def.DescCharacterLimit) {
                            s += itm.channel.item.description.substring(0, def.DescCharacterLimit) + '...';
                        }
                        else {
                            s += itm.channel.item.description;
                         }
                         s += '</div>';
                    }
                });
                $("#" + id).append('<ul class="feedEkList">' + s + '</ul>');
            }
        });
    };
})(jQuery);

最后,从YQL返回的XML是失败的结果

/**/
jQuery112204319277675822377_1459586267516({
    "query": {
        "count": 0,
        "created": "2016-04-02T08:37:48Z",
        "lang": "en-US",
        "diagnostics": {
            "publiclyCallable": "true",
            "url": {
                "execution-start-time": "1",
                "execution-stop-time": "59",
                "execution-time": "58",
                "content": "http://feeds.arstechnica.com/arstechnica/index"
            },
            "info": "Using encoding from response content-type header (UTF-8) as XML document does not specify encoding.",
            "user-time": "60",
            "service-time": "58",
            "build-version": "0.2.430"
        },
        "meta": {
            "url": {
                "id": "http://feeds.arstechnica.com/arstechnica/index",
                "status": "200",
                "headers": {
                    "header": [{
                        "name": "Content-Type",
                        "value": "text/xml; charset=UTF-8"
                    }, {
                        "name": "ETag",
                        "value": "m+oG6+UhrscSbLRLhGlL3lvlwNo"
                    }, {
                        "name": "Last-Modified",
                        "value": "Sat, 02 Apr 2016 07:32:51 GMT"
                    }, {
                        "name": "Content-Encoding",
                        "value": "gzip"
                    }, {
                        "name": "Expires",
                        "value": "Sat, 02 Apr 2016 07:40:36 GMT"
                    }, {
                        "name": "Cache-Control",
                        "value": "private, max-age=0"
                    }, {
                        "name": "X-Content-Type-Options",
                        "value": "nosniff"
                    }, {
                        "name": "X-XSS-Protection",
                        "value": "1; mode=block"
                    }, {
                        "name": "Server",
                        "value": "ATS"
                    }, {
                        "name": "Date",
                        "value": "Sat, 02 Apr 2016 08:37:48 GMT"
                    }, {
                        "name": "Age",
                        "value": "0"
                    }, {
                        "name": "Connection",
                        "value": "close"
                    }, {
                        "name": "Via",
                        "value": "http/1.1 ec2.ycs.bf1.yahoo.net (ApacheTrafficServer [cSsNfU])"
                    }
                    ]
                }
            }
        },
        "results": null
    }
});

1 个答案:

答案 0 :(得分:1)

在做了一些更多的实验之后,我认为只有解决方案是YQL不喜欢需要更长时间才能提供服务的Feed。较慢和高需求的饲料似乎是出现这个问题的。

我有一种感觉,可能是因为API代码有一个超时,其中控制台的功能代码并没有快乐地等待,因此为什么它适用于一个而不是另一个。

不幸的是,似乎唯一的解决方案是小心使用您的Feed。