net/test/url_request/url_request_slow_download_job.h

   1 // Copyright (c) 2012 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 // This class simulates a slow download. Requests to |kUnknownSizeUrl| and
   5 // |kKnownSizeUrl| start downloads that pause after the first N bytes, to be
   6 // completed by sending a request to |kFinishDownloadUrl|.
   7
   8 #ifndef NET_TEST_URL_REQUEST_URL_REQUEST_SLOW_DOWNLOAD_JOB_H_
   9 #define NET_TEST_URL_REQUEST_URL_REQUEST_SLOW_DOWNLOAD_JOB_H_
  10
  11 #include <set>
  12 #include <string>
  13
  14 #include "base/lazy_instance.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "net/url_request/url_request_job.h"
  17
  18 namespace net {
  19
  20 class URLRequestSlowDownloadJob : public URLRequestJob {
  21  public:
  22   // Test URLs.
  23   static const char kUnknownSizeUrl[];
  24   static const char kKnownSizeUrl[];
  25   static const char kFinishDownloadUrl[];
  26   static const char kErrorDownloadUrl[];
  27
  28   // Download sizes.
  29   static const int kFirstDownloadSize;
  30   static const int kSecondDownloadSize;
  31
  32   // Timer callback, used to check to see if we should finish our download and
  33   // send the second chunk.
  34   void CheckDoneStatus();
  35
  36   // URLRequestJob methods
  37   void Start() override;
  38   bool GetMimeType(std::string* mime_type) const override;
  39   void GetResponseInfo(HttpResponseInfo* info) override;
  40   bool ReadRawData(IOBuffer* buf, int buf_size, int* bytes_read) override;
  41
  42   // Returns the current number of URLRequestSlowDownloadJobs that have
  43   // not yet completed.
  44   static size_t NumberOutstandingRequests();
  45
  46   // Adds the testing URLs to the URLRequestFilter.
  47   static void AddUrlHandler();
  48
  49  private:
  50   class Interceptor;
  51
  52   // Enum indicating where we are in the read after a call to
  53   // FillBufferHelper.
  54   enum ReadStatus {
  55     // The buffer was filled with data and may be returned.
  56     BUFFER_FILLED,
  57
  58     // No data was added to the buffer because kFinishDownloadUrl has
  59     // not yet been seen and we've already returned the first chunk.
  60     REQUEST_BLOCKED,
  61
  62     // No data was added to the buffer because we've already returned
  63     // all the data.
  64     REQUEST_COMPLETE
  65   };
  66
  67   URLRequestSlowDownloadJob(URLRequest* request,
  68                             NetworkDelegate* network_delegate);
  69   ~URLRequestSlowDownloadJob() override;
  70
  71   ReadStatus FillBufferHelper(IOBuffer* buf, int buf_size, int* bytes_written);
  72
  73   void GetResponseInfoConst(HttpResponseInfo* info) const;
  74
  75   // Mark all pending requests to be finished.  We keep track of pending
  76   // requests in |pending_requests_|.
  77   static void FinishPendingRequests();
  78   static void ErrorPendingRequests();
  79   typedef std::set<URLRequestSlowDownloadJob*> SlowJobsSet;
  80   static base::LazyInstance<SlowJobsSet>::Leaky pending_requests_;
  81
  82   void StartAsync();
  83
  84   void set_should_finish_download() { should_finish_download_ = true; }
  85   void set_should_error_download() { should_error_download_ = true; }
  86
  87   int bytes_already_sent_;
  88   bool should_error_download_;
  89   bool should_finish_download_;
  90   scoped_refptr<IOBuffer> buffer_;
  91   int buffer_size_;
  92
  93   base::WeakPtrFactory<URLRequestSlowDownloadJob> weak_factory_;
  94 };
  95
  96 }  // namespace content
  97
  98 #endif  // NET_TEST_URL_REQUEST_URL_REQUEST_SLOW_DOWNLOAD_JOB_H_