如何利用Node.js为Node.js生成HttpStatusCode辅助类并发布到npm

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      作为一个好的Restfull Api不仅在于service url的语义,可读性,幂等,正交，作为http状态码也很重要，一个好的Http Status Code给使用者一个很好的响应，比如200表示正常成功，201表示创建成功，409冲突，404资源不存在等等。所以在做一个基于node.js+mongodb+angularjs的demo时发现node.js express没有提供相应的辅助类，但是本人不喜欢将201,404这类毫无语言层次语义的东西到处充斥着，所以最后决定自己写一个，但是同时本人也很懒，不喜欢做重复的苦力活，怎么办？那就从我最熟悉的c#中HttpStatusCode枚举中copy出来吧，最后为了简便在mac上所以采用了利用node.js去解析msdn关于httpstatuscode的文档生成node.js的辅助类。

    代码很简单：

var http = require('http');
var fs = require('fs');
var $ = require('jquery');
var output = "httpStatusCode/index.js";
(function(){
   
    String.format = function() {
        var s = arguments[0];
        for (var i = 0; i < arguments.length - 1; i++) {
            var reg = new RegExp("\\{" + i + "\\}", "gm");
            s = s.replace(reg, arguments[i + 1]);
        }

 
        return s;
    };

 
    var options = {
        host:'msdn.microsoft.com',
        port:80,
        path:'/zh-cn/library/system.net.httpstatuscode.aspx'
    };

 
    http.get(options,function (response) {
        var html = "";
        response.on("data",function (chunk) {
            html += chunk;
        }).on("end", function () {
            handler(html);
        }).on('error', function (e) {
            console.log("Got error: " + e.message);
        });

 
    function getHttpStatusCode(htmlString) {
        var $doc = $(html);
        var rows = $doc.find("table#memberList tr:gt(0)");
        var status = {};
        rows.each(function(i,row){
            status[$(row).find("td:eq(1)").text()] =
                parseInt($(row).find("td:eq(2)").text().match(/\d+/).toString());
        });
       return status;
    };
    
    function generateCode(status){
       var code = "";
       code += "exports.httpStatusCode = " + JSON.stringify(status) + ";";
       return code;
    };
   
    function writeFile(code){
        fs.writeFile(output, code, function(err) {
            if(err) {
                console.log(err);
            } else {
                console.log("The file was saved " + output + "!");
            }
        });
    };

 
    function handler(html){
       var status = getHttpStatusCode(html);
       var code = generateCode(status);
       writeFile(code);
    };

 
  });
})();

代码寄宿在github：https://github.com/greengerong/node-httpstatuscode

最终生成类为：

exports.httpStatusCode = {
    "Continue": 100,
    "SwitchingProtocols": 101,
    "OK": 200,
    "Created": 201,
    "Accepted": 202,
    "NonAuthoritativeInformation": 203,
    "NoContent": 204,
    "ResetContent": 205,
    "PartialContent": 206,
    "MultipleChoices": 300,
    "Ambiguous": 300,
    "MovedPermanently": 301,
    "Moved": 301,
    "Found": 302,
    "Redirect": 302,
    "SeeOther": 303,
    "RedirectMethod": 303,
    "NotModified": 304,
    "UseProxy": 305,
    "Unused": 306,
    "TemporaryRedirect": 307,
    "RedirectKeepVerb": 307,
    "BadRequest": 400,
    "Unauthorized": 401,
    "PaymentRequired": 402,
    "Forbidden": 403,
    "NotFound": 404,
    "MethodNotAllowed": 405,
    "NotAcceptable": 406,
    "ProxyAuthenticationRequired": 407,
    "RequestTimeout": 408,
    "Conflict": 409,
    "Gone": 410,
    "LengthRequired": 411,
    "PreconditionFailed": 412,
    "RequestEntityTooLarge": 413,
    "RequestUriTooLong": 414,
    "UnsupportedMediaType": 415,
    "RequestedRangeNotSatisfiable": 416,
    "ExpectationFailed": 417,
    "UpgradeRequired": 426,
    "InternalServerError": 500,
    "NotImplemented": 501,
    "BadGateway": 502,
    "ServiceUnavailable": 503,
    "GatewayTimeout": 504,
    "HttpVersionNotSupported": 505
};

最后考虑到或许还有很多像我一样懒散的人，所以共享此代码发布到了npm，只需要npm install httpstatuscode，便可以简单实用，如下是一个测试demo：

var httpStatusCode = require("httpstatuscode").httpStatusCode;

 
var toBeEqual = function (actual,expected){
    if(actual !== expected){
     throw  (actual + " not equal " + expected);
    }
};

 
toBeEqual(httpStatusCode.OK,200);
toBeEqual(httpStatusCode.Created,201);
toBeEqual(httpStatusCode.BadRequest,400);
toBeEqual(httpStatusCode.InternalServerError,500);

 
console.log(httpStatusCode);
console.log("success");

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