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      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 #include "media/base/cdm_promise.h"
      6 
      7 #include "base/bind.h"
      8 #include "base/logging.h"
      9 #include "base/metrics/histogram.h"
     10 
     11 namespace media {
     12 
     13 template <typename T>
     14 struct CdmPromiseTraits {};
     15 
     16 template <>
     17 struct CdmPromiseTraits<void> {
     18   static const CdmPromise::ResolveParameterType kType = CdmPromise::VOID_TYPE;
     19 };
     20 
     21 template <>
     22 struct CdmPromiseTraits<std::string> {
     23   static const CdmPromise::ResolveParameterType kType = CdmPromise::STRING_TYPE;
     24 };
     25 
     26 template <>
     27 struct CdmPromiseTraits<KeyIdsVector> {
     28   static const CdmPromise::ResolveParameterType kType =
     29       CdmPromise::KEY_IDS_VECTOR_TYPE;
     30 };
     31 
     32 CdmPromise::CdmPromise(ResolveParameterType parameter_type)
     33     : parameter_type_(parameter_type), is_pending_(true) {
     34 }
     35 
     36 CdmPromise::CdmPromise(ResolveParameterType parameter_type,
     37                        PromiseRejectedCB reject_cb)
     38     : parameter_type_(parameter_type),
     39       reject_cb_(reject_cb),
     40       is_pending_(true) {
     41   DCHECK(!reject_cb_.is_null());
     42 }
     43 
     44 CdmPromise::CdmPromise(ResolveParameterType parameter_type,
     45                        PromiseRejectedCB reject_cb,
     46                        const std::string& uma_name)
     47     : parameter_type_(parameter_type),
     48       reject_cb_(reject_cb),
     49       is_pending_(true),
     50       uma_name_(uma_name) {
     51   DCHECK(!reject_cb_.is_null());
     52   DCHECK(!uma_name_.empty());
     53 }
     54 
     55 CdmPromise::~CdmPromise() {
     56   DCHECK(!is_pending_);
     57 }
     58 
     59 static CdmPromise::ResultCodeForUMA ConvertExceptionToUMAResult(
     60     MediaKeys::Exception exception_code) {
     61   switch (exception_code) {
     62     case MediaKeys::NOT_SUPPORTED_ERROR:
     63       return CdmPromise::NOT_SUPPORTED_ERROR;
     64     case MediaKeys::INVALID_STATE_ERROR:
     65       return CdmPromise::INVALID_STATE_ERROR;
     66     case MediaKeys::INVALID_ACCESS_ERROR:
     67       return CdmPromise::INVALID_ACCESS_ERROR;
     68     case MediaKeys::QUOTA_EXCEEDED_ERROR:
     69       return CdmPromise::QUOTA_EXCEEDED_ERROR;
     70     case MediaKeys::UNKNOWN_ERROR:
     71       return CdmPromise::UNKNOWN_ERROR;
     72     case MediaKeys::CLIENT_ERROR:
     73       return CdmPromise::CLIENT_ERROR;
     74     case MediaKeys::OUTPUT_ERROR:
     75       return CdmPromise::OUTPUT_ERROR;
     76   }
     77   NOTREACHED();
     78   return CdmPromise::UNKNOWN_ERROR;
     79 }
     80 
     81 void CdmPromise::reject(MediaKeys::Exception exception_code,
     82                         uint32 system_code,
     83                         const std::string& error_message) {
     84   ReportResultToUMA(ConvertExceptionToUMAResult(exception_code));
     85   reject_cb_.Run(exception_code, system_code, error_message);
     86 }
     87 
     88 void CdmPromise::ReportResultToUMA(ResultCodeForUMA result) {
     89   DCHECK(is_pending_);
     90   is_pending_ = false;
     91   if (!uma_name_.empty()) {
     92     base::LinearHistogram::FactoryGet(
     93         uma_name_,
     94         1,
     95         NUM_RESULT_CODES,
     96         NUM_RESULT_CODES + 1,
     97         base::HistogramBase::kUmaTargetedHistogramFlag)->Add(result);
     98   }
     99 }
    100 
    101 template <typename T>
    102 CdmPromiseTemplate<T>::CdmPromiseTemplate(
    103     base::Callback<void(const T&)> resolve_cb,
    104     PromiseRejectedCB reject_cb)
    105     : CdmPromise(CdmPromiseTraits<T>::kType, reject_cb),
    106       resolve_cb_(resolve_cb) {
    107   DCHECK(!resolve_cb_.is_null());
    108 }
    109 
    110 template <typename T>
    111 CdmPromiseTemplate<T>::CdmPromiseTemplate(
    112     base::Callback<void(const T&)> resolve_cb,
    113     PromiseRejectedCB reject_cb,
    114     const std::string& uma_name)
    115     : CdmPromise(CdmPromiseTraits<T>::kType, reject_cb, uma_name),
    116       resolve_cb_(resolve_cb) {
    117   DCHECK(!resolve_cb_.is_null());
    118 }
    119 
    120 template <typename T>
    121 CdmPromiseTemplate<T>::CdmPromiseTemplate()
    122     : CdmPromise(CdmPromiseTraits<T>::kType) {
    123 }
    124 
    125 template <typename T>
    126 void CdmPromiseTemplate<T>::resolve(const T& result) {
    127   ReportResultToUMA(SUCCESS);
    128   resolve_cb_.Run(result);
    129 }
    130 
    131 CdmPromiseTemplate<void>::CdmPromiseTemplate(base::Callback<void()> resolve_cb,
    132                                              PromiseRejectedCB reject_cb)
    133     : CdmPromise(CdmPromiseTraits<void>::kType, reject_cb),
    134       resolve_cb_(resolve_cb) {
    135   DCHECK(!resolve_cb_.is_null());
    136 }
    137 
    138 CdmPromiseTemplate<void>::CdmPromiseTemplate(base::Callback<void()> resolve_cb,
    139                                              PromiseRejectedCB reject_cb,
    140                                              const std::string& uma_name)
    141     : CdmPromise(CdmPromiseTraits<void>::kType, reject_cb, uma_name),
    142       resolve_cb_(resolve_cb) {
    143   DCHECK(!resolve_cb_.is_null());
    144   DCHECK(!uma_name_.empty());
    145 }
    146 
    147 CdmPromiseTemplate<void>::CdmPromiseTemplate()
    148     : CdmPromise(CdmPromiseTraits<void>::kType) {
    149 }
    150 
    151 void CdmPromiseTemplate<void>::resolve() {
    152   ReportResultToUMA(SUCCESS);
    153   resolve_cb_.Run();
    154 }
    155 
    156 // Explicit template instantiation for the Promises needed.
    157 template class MEDIA_EXPORT CdmPromiseTemplate<std::string>;
    158 template class MEDIA_EXPORT CdmPromiseTemplate<KeyIdsVector>;
    159 
    160 }  // namespace media
    161