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

2013-04-09 00:07  破狼  阅读(3158)  评论(1)  编辑  收藏  举报

      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：

  1 var http = require('http');
  2 
  3 var fs = require('fs');
  4 
  5 var $ = require('jquery');
  6 
  7 var output = "httpStatusCode/index.js";
  8 
  9 (function(){
 10 
 11     
 12 
 13     String.format = function() {
 14 
 15         var s = arguments[0];
 16 
 17         for (var i = 0; i < arguments.length - 1; i++) {
 18 
 19             var reg = new RegExp("\\{" + i + "\\}", "gm");
 20 
 21             s = s.replace(reg, arguments[i + 1]);
 22 
 23         }
 24 
 25         return s;
 26 
 27     };
 28 
 29 
 30 
 31 
 32     var options = {
 33 
 34         host:'msdn.microsoft.com',
 35 
 36         port:80,
 37 
 38         path:'/zh-cn/library/system.net.httpstatuscode.aspx'
 39 
 40     };
 41 
 42 
 43 
 44 
 45     http.get(options,function (response) {
 46 
 47         var html = "";
 48 
 49         response.on("data",function (chunk) {
 50 
 51             html += chunk;
 52 
 53         }).on("end", function () {
 54 
 55             handler(html);
 56 
 57         }).on('error', function (e) {
 58 
 59             console.log("Got error: " + e.message);
 60 
 61         });
 62 
 63 
 64 
 65 
 66     function getHttpStatusCode(htmlString) {
 67 
 68         var $doc = $(html);
 69 
 70         var rows = $doc.find("table#memberList tr:gt(0)");
 71 
 72         var status = {};
 73 
 74         rows.each(function(i,row){
 75 
 76             status[$(row).find("td:eq(1)").text()] = 
 77 
 78                 parseInt($(row).find("td:eq(2)").text().match(/\d+/).toString());
 79 
 80         });
 81 
 82        return status;
 83 
 84     };
 85 
 86      
 87 
 88     function generateCode(status){
 89 
 90        var code = "";
 91 
 92        code += "exports.httpStatusCode = " + JSON.stringify(status) + ";";
 93 
 94        return code;
 95 
 96     };
 97 
 98     
 99 
100     function writeFile(code){
101 
102         fs.writeFile(output, code, function(err) {
103 
104             if(err) {
105 
106                 console.log(err);
107 
108             } else {
109 
110                 console.log("The file was saved " + output + "!");
111 
112             }
113 
114         }); 
115 
116     };
117 
118 
119 
120 
121     function handler(html){
122 
123        var status = getHttpStatusCode(html);
124 
125        var code = generateCode(status);
126 
127        writeFile(code);
128 
129     };
130 
131 
132 
133 
134   });
135 
136 })();

 

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

最终生成类为：

View Code 
 1 exports.httpStatusCode = { 
 2     "Continue": 100, 
 3     "SwitchingProtocols": 101, 
 4     "OK": 200, 
 5     "Created": 201, 
 6     "Accepted": 202, 
 7     "NonAuthoritativeInformation": 203, 
 8     "NoContent": 204, 
 9     "ResetContent": 205, 
10     "PartialContent": 206, 
11     "MultipleChoices": 300, 
12     "Ambiguous": 300, 
13     "MovedPermanently": 301, 
14     "Moved": 301, 
15     "Found": 302, 
16     "Redirect": 302, 
17     "SeeOther": 303, 
18     "RedirectMethod": 303, 
19     "NotModified": 304, 
20     "UseProxy": 305, 
21     "Unused": 306, 
22     "TemporaryRedirect": 307, 
23     "RedirectKeepVerb": 307, 
24     "BadRequest": 400, 
25     "Unauthorized": 401, 
26     "PaymentRequired": 402, 
27     "Forbidden": 403, 
28     "NotFound": 404, 
29     "MethodNotAllowed": 405, 
30     "NotAcceptable": 406, 
31     "ProxyAuthenticationRequired": 407, 
32     "RequestTimeout": 408, 
33     "Conflict": 409, 
34     "Gone": 410, 
35     "LengthRequired": 411, 
36     "PreconditionFailed": 412, 
37     "RequestEntityTooLarge": 413, 
38     "RequestUriTooLong": 414, 
39     "UnsupportedMediaType": 415, 
40     "RequestedRangeNotSatisfiable": 416, 
41     "ExpectationFailed": 417, 
42     "UpgradeRequired": 426, 
43     "InternalServerError": 500, 
44     "NotImplemented": 501, 
45     "BadGateway": 502, 
46     "ServiceUnavailable": 503, 
47     "GatewayTimeout": 504, 
48     "HttpVersionNotSupported": 505 
49 };

    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：

 1 var httpStatusCode = require("httpstatuscode").httpStatusCode;
 2 
 3 var toBeEqual = function (actual,expected){
 4 
 5     if(actual !== expected){
 6 
 7      throw (actual + " not equal " + expected);
 8 
 9     }
10 
11 };
12 
13 toBeEqual(httpStatusCode.OK,200);
14 
15 toBeEqual(httpStatusCode.Created,201);
16 
17 toBeEqual(httpStatusCode.BadRequest,400);
18 
19 toBeEqual(httpStatusCode.InternalServerError,500);
20 
21 
22 
23 
24 console.log(httpStatusCode);
25 
26 console.log("success");

    懒人的文章总是代码多余文字，希望代码能说明一切，感谢各位能阅读此随笔。