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