net/url_request/url_request_test_job.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_URL_REQUEST_URL_REQUEST_TEST_JOB_H_
   6 #define NET_URL_REQUEST_URL_REQUEST_TEST_JOB_H_
   7 #pragma once
   8
   9 #include <string>
  10
  11 #include "base/memory/weak_ptr.h"
  12 #include "net/url_request/url_request.h"
  13 #include "net/url_request/url_request_job.h"
  14
  15 namespace net {
  16
  17 // This job type is designed to help with simple unit tests. To use, you
  18 // probably want to inherit from it to set up the state you want. Then install
  19 // it as the protocol handler for the "test" scheme.
  20 //
  21 // It will respond to three URLs, which you can retrieve using the test_url*
  22 // getters, which will in turn respond with the corresponding responses returned
  23 // by test_data*. Any other URLs that begin with "test:" will return an error,
  24 // which might also be useful, you can use test_url_error() to retreive a
  25 // standard one.
  26 //
  27 // You can override the known URLs or the response data by overriding Start().
  28 //
  29 // Optionally, you can also construct test jobs to return a headers and data
  30 // provided to the contstructor in response to any request url.
  31 //
  32 // When a job is created, it gets put on a queue of pending test jobs. To
  33 // process jobs on this queue, use ProcessOnePendingMessage, which will process
  34 // one step of the next job. If the job is incomplete, it will be added to the
  35 // end of the queue.
  36 //
  37 // Optionally, you can also construct test jobs that advance automatically
  38 // without having to call ProcessOnePendingMessage.
  39 class NET_EXPORT_PRIVATE URLRequestTestJob : public URLRequestJob {
  40  public:
  41   // Constructs a job to return one of the canned responses depending on the
  42   // request url, with auto advance disabled.
  43   explicit URLRequestTestJob(URLRequest* request);
  44
  45   // Constructs a job to return one of the canned responses depending on the
  46   // request url, optionally with auto advance enabled.
  47   URLRequestTestJob(URLRequest* request, bool auto_advance);
  48
  49   // Constructs a job to return the given response regardless of the request
  50   // url. The headers should include the HTTP status line and be formatted as
  51   // expected by HttpResponseHeaders.
  52   URLRequestTestJob(URLRequest* request,
  53                     const std::string& response_headers,
  54                     const std::string& response_data,
  55                     bool auto_advance);
  56
  57   // The three canned URLs this handler will respond to without having been
  58   // explicitly initialized with response headers and data.
  59   // FIXME(brettw): we should probably also have a redirect one
  60   static GURL test_url_1();
  61   static GURL test_url_2();
  62   static GURL test_url_3();
  63   static GURL test_url_error();
  64
  65   // The data that corresponds to each of the URLs above
  66   static std::string test_data_1();
  67   static std::string test_data_2();
  68   static std::string test_data_3();
  69
  70   // The headers that correspond to each of the URLs above
  71   static std::string test_headers();
  72
  73   // The headers for a redirect response
  74   static std::string test_redirect_headers();
  75
  76   // The headers for a server error response
  77   static std::string test_error_headers();
  78
  79   // Processes one pending message from the stack, returning true if any
  80   // message was processed, or false if there are no more pending request
  81   // notifications to send. This is not applicable when using auto_advance.
  82   static bool ProcessOnePendingMessage();
  83
  84   // With auto advance enabled, the job will advance thru the stages without
  85   // the caller having to call ProcessOnePendingMessage. Auto advance depends
  86   // on having a message loop running. The default is to not auto advance.
  87   // Should not be altered after the job has started.
  88   bool auto_advance() { return auto_advance_; }
  89   void set_auto_advance(bool auto_advance) { auto_advance_ = auto_advance; }
  90
  91   // Factory method for protocol factory registration if callers don't subclass
  92   static URLRequest::ProtocolFactory Factory;
  93
  94   // Job functions
  95   virtual void Start() OVERRIDE;
  96   virtual bool ReadRawData(IOBuffer* buf,
  97                            int buf_size,
  98                            int *bytes_read) OVERRIDE;
  99   virtual void Kill() OVERRIDE;
 100   virtual bool GetMimeType(std::string* mime_type) const OVERRIDE;
 101   virtual void GetResponseInfo(HttpResponseInfo* info) OVERRIDE;
 102   virtual int GetResponseCode() const OVERRIDE;
 103   virtual bool IsRedirectResponse(GURL* location,
 104                                   int* http_status_code) OVERRIDE;
 105
 106  protected:
 107   // This is what operation we are going to do next when this job is handled.
 108   // When the stage is DONE, this job will not be put on the queue.
 109   enum Stage { WAITING, DATA_AVAILABLE, ALL_DATA, DONE };
 110
 111   virtual ~URLRequestTestJob();
 112
 113   // Call to process the next opeation, usually sending a notification, and
 114   // advancing the stage if necessary. THIS MAY DELETE THE OBJECT.
 115   void ProcessNextOperation();
 116
 117   // Call to move the job along to the next operation.
 118   void AdvanceJob();
 119
 120   // Called via InvokeLater to cause callbacks to occur after Start() returns.
 121   virtual void StartAsync();
 122
 123   bool auto_advance_;
 124
 125   Stage stage_;
 126
 127   // The headers the job should return, will be set in Start() if not provided
 128   // in the explicit ctor.
 129   scoped_refptr<HttpResponseHeaders> response_headers_;
 130
 131   // The data to send, will be set in Start() if not provided in the explicit
 132   // ctor.
 133   std::string response_data_;
 134
 135   // current offset within response_data_
 136   int offset_;
 137
 138   // Holds the buffer for an asynchronous ReadRawData call
 139   IOBuffer* async_buf_;
 140   int async_buf_size_;
 141
 142   base::WeakPtrFactory<URLRequestTestJob> weak_factory_;
 143 };
 144
 145 }  // namespace net
 146
 147 #endif  // NET_URL_REQUEST_URL_REQUEST_TEST_JOB_H_