mountebank配置（二）

上一篇中对stubs配置做了介绍，该篇对imposter和stubs在上一篇中没有提及的配置进行简短的介绍，该篇内容并不多。

配置多个imposter

前篇中的示例都是在imposters.ejs文件中配置了一个imposter，mb在启动时是可以加载多个imposter的，并且可以加载外部文件，配置如下：

{
    "imposters": [
        <% include ./imposter1.json %>,
        <% include ./imposter2.json %>,
        <% include ./imposter3.json %>
    ]
}

imposter1.json imposter2.json imposter3.json三个文件代表了三个imposter的配置, 文件内容示例:

{
  "port": 4545,
  "protocol": "http",
  "stubs": [{
    "predicates": [{
      "equals": {
        "path": "/test",
        "method": "POST",
        "headers": { "Content-Type": "application/json" }
      }
    }],    
    "responses": [
      { "is": { "statusCode": 400 }}
    ]
  }]
}

暂时发现一个问题，各个imposter的监听端口不可重复，否则会有一个imposter不会被加载

imposter的配置项

这里补充一下imposter中的配置项，前篇中只在示例中写到了 protocol, port, stubs。

配置项	参数配置	是否必填	默认值	描述
protocol	http	Y	N/A	可接收的协议，mb支持http, https, tcp, smtp，但是该列表中的参数针对的是http, 所以参数配置值为http
port	可使用的端口号	N	随机端口号，建议填写。mb会在POST返回真正的端口号（然而我不知道请求那个地址）	监听端口
name	任何字符串	N	空字符串	改名称会包含在日志中，当配置多个imposter时比较有用，可以进行区分
recordRequests	true or false	N	false	暂时没研究，贴一下原文：Adds mock verification support by remembering the requests made to this imposter. Note that this represents a memory leak for any long running mb process, as requests are never forgotten.
stubs	可用的stubs配置对象	N	[]	模拟请求的配置数组
defaultResponse	可用的response对象	N	{ "statusCode": 200, "headers": { "connection": "close" }, "body": ""}	默认的响应对象， predicates没有匹配时返回改响应对象
allowCORS	boolean	N	false	暂时未研究，贴一下原文：If true, mountebank will allow all CORS preflight requests on the imposter.

一下两节内容的配置，我并没有一一尝试

stubs配置Predicates的其他参数

参数配置	默认值	描述
caseSensitive	false	匹配项是否大小写敏感
except	""	Defines a regular expression that is stripped out of the request field before matching.
xpath	null	Defines an object containing a selector string and, optionally, an ns object field that defines a namespace map. The predicate's scope is limited to the selected value in the request field.
jsonpath	null	Defines an object containing a selector string. The predicate's scope is limited to the selected value in the request field.

示例：

{
  "port": 4547,
  "protocol": "http",
  "stubs": [
    {
      "responses": [{ "is": { "body": "first" } }],
      "predicates": [
        {
          "equals" : {
            "path":"/test",
            "body" : "first"
          },
          "caseSensitive":true,
          "except" : "\\d+$"
        }
      ]
    }
  ]
}

这里的except 没有理解是怎么样的匹配规则，后续补充。

xpath和jsonpath请阅读官方文档，传送门:xpath、jsonpath

stubs配置Response的Behaviors

这些behaviors我只尝试了几个简单的，这里整理一下。

• wait

  请求等待一定时间后进行响应，应该可以用来模拟长时间请求。
  该参数支持function操作，mb启动时添加 --allowInjection参数

  示例：

  {
     "port": 4545,
     "protocol": "http",
     "stubs": [
       {
         "responses": [
           {
             "is": { "body": "This took at least half a second to send" },
             "_behaviors": {
               "wait": 500
             }
           }
         ]
       }
     ]
   }
  

     {
       "port": 4545,
       "protocol": "http",
       "stubs": [
         {
           "responses": [
             {
               "is": { "body": "This took at least 100 to 1000 ms to send" },
               "_behaviors": {
                 "wait": "function() { return Math.floor(Math.random() * 901) + 100; }"
               }
             }
           ]
         }
       ]
     }
  

• repeat

  响应的重复次数。

  {
        "port": 7777,
        "protocol": "http",
        "stubs": [
          {
            "responses": [
              {
                "is": {
                  "body": "This will repeat 2 times"
                },
                "_behaviors": {
                  "repeat": 2
                }
              },
              {
                "is": {
                  "body": "Then this will return"
                }
              }
            ]
          }
        ]
      }
  

  This will repeat 2 times响应两次后，才会返回Then this will return响应对象。

• 其他参数

  copy,lookup, decorate, shellTransform 请阅读官方文档， 传送门