media/blink/cdm_result_promise.h

   1 // Copyright 2014 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 MEDIA_BLINK_CDM_RESULT_PROMISE_H_
   6 #define MEDIA_BLINK_CDM_RESULT_PROMISE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "media/base/cdm_promise.h"
  10 #include "media/base/media_keys.h"
  11 #include "media/blink/cdm_result_promise_helper.h"
  12 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
  13
  14 namespace media {
  15
  16 // Used to convert a WebContentDecryptionModuleResult into a CdmPromiseTemplate
  17 // so that it can be passed through Chromium. When resolve(T) is called, the
  18 // appropriate complete...() method on WebContentDecryptionModuleResult will be
  19 // invoked. If reject() is called instead,
  20 // WebContentDecryptionModuleResult::completeWithError() is called.
  21 // If constructed with a |uma_name|, CdmResultPromise will report the promise
  22 // result (success or rejection code) to UMA.
  23 template <typename... T>
  24 class CdmResultPromise : public media::CdmPromiseTemplate<T...> {
  25  public:
  26   CdmResultPromise(const blink::WebContentDecryptionModuleResult& result,
  27                    const std::string& uma_name);
  28   virtual ~CdmResultPromise();
  29
  30   // CdmPromiseTemplate<T> implementation.
  31   virtual void resolve(const T&... result) override;
  32   virtual void reject(media::MediaKeys::Exception exception_code,
  33                       uint32 system_code,
  34                       const std::string& error_message) override;
  35
  36  private:
  37   using media::CdmPromiseTemplate<T...>::MarkPromiseSettled;
  38
  39   blink::WebContentDecryptionModuleResult web_cdm_result_;
  40
  41   // UMA name to report result to.
  42   std::string uma_name_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(CdmResultPromise);
  45 };
  46
  47 template <typename... T>
  48 CdmResultPromise<T...>::CdmResultPromise(
  49     const blink::WebContentDecryptionModuleResult& result,
  50     const std::string& uma_name)
  51     : web_cdm_result_(result), uma_name_(uma_name) {
  52 }
  53
  54 template <typename... T>
  55 CdmResultPromise<T...>::~CdmResultPromise() {
  56 }
  57
  58 // "inline" is needed to prevent multiple definition error.
  59
  60 template <>
  61 inline void CdmResultPromise<>::resolve() {
  62   MarkPromiseSettled();
  63   ReportCdmResultUMA(uma_name_, SUCCESS);
  64   web_cdm_result_.complete();
  65 }
  66
  67 template <>
  68 inline void CdmResultPromise<media::KeyIdsVector>::resolve(
  69     const media::KeyIdsVector& result) {
  70   // TODO(jrummell): Update blink::WebContentDecryptionModuleResult to
  71   // handle the set of keys.
  72   reject(media::MediaKeys::NOT_SUPPORTED_ERROR, 0, "Not implemented.");
  73 }
  74
  75 template <typename... T>
  76 void CdmResultPromise<T...>::reject(media::MediaKeys::Exception exception_code,
  77                                     uint32 system_code,
  78                                     const std::string& error_message) {
  79   MarkPromiseSettled();
  80   ReportCdmResultUMA(uma_name_,
  81                      ConvertCdmExceptionToResultForUMA(exception_code));
  82   web_cdm_result_.completeWithError(ConvertCdmException(exception_code),
  83                                     system_code,
  84                                     blink::WebString::fromUTF8(error_message));
  85 }
  86
  87 }  // namespace media
  88
  89 #endif  // MEDIA_BLINK_CDM_RESULT_PROMISE_H_