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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BLINK_CDM_RESULT_PROMISE_H_
#define MEDIA_BLINK_CDM_RESULT_PROMISE_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/metrics/histogram_functions.h"
#include "base/time/time.h"
#include "media/blink/cdm_result_promise_helper.h"
#include "third_party/blink/public/platform/web_content_decryption_module_result.h"
#include "third_party/blink/public/platform/web_string.h"
namespace media {
const char kTimeUMAPrefix[] = "TimeTo.";
// Used to convert a WebContentDecryptionModuleResult into a CdmPromiseTemplate
// so that it can be passed through Chromium. When resolve(T) is called, the
// appropriate complete...() method on WebContentDecryptionModuleResult will be
// invoked. If reject() is called instead,
// WebContentDecryptionModuleResult::completeWithError() is called.
// If constructed with a |uma_name|, CdmResultPromise will report the promise
// result (success or rejection code) to UMA.
template <typename... T>
class CdmResultPromise : public CdmPromiseTemplate<T...> {
public:
CdmResultPromise(const blink::WebContentDecryptionModuleResult& result,
const std::string& key_system_uma_prefix,
const std::string& uma_name);
~CdmResultPromise() override;
// CdmPromiseTemplate<T> implementation.
void resolve(const T&... result) override;
void reject(CdmPromise::Exception exception_code,
uint32_t system_code,
const std::string& error_message) override;
private:
using CdmPromiseTemplate<T...>::IsPromiseSettled;
using CdmPromiseTemplate<T...>::MarkPromiseSettled;
using CdmPromiseTemplate<T...>::RejectPromiseOnDestruction;
blink::WebContentDecryptionModuleResult web_cdm_result_;
// UMA prefix and name to report result and time to.
std::string key_system_uma_prefix_;
std::string uma_name_;
// Time when |this| is created.
base::TimeTicks creation_time_;
DISALLOW_COPY_AND_ASSIGN(CdmResultPromise);
};
template <typename... T>
CdmResultPromise<T...>::CdmResultPromise(
const blink::WebContentDecryptionModuleResult& result,
const std::string& key_system_uma_prefix,
const std::string& uma_name)
: web_cdm_result_(result),
key_system_uma_prefix_(key_system_uma_prefix),
uma_name_(uma_name),
creation_time_(base::TimeTicks::Now()) {
DCHECK(!key_system_uma_prefix_.empty());
DCHECK(!uma_name_.empty());
}
template <typename... T>
CdmResultPromise<T...>::~CdmResultPromise() {
if (!IsPromiseSettled())
RejectPromiseOnDestruction();
}
// "inline" is needed to prevent multiple definition error.
template <>
inline void CdmResultPromise<>::resolve() {
MarkPromiseSettled();
ReportCdmResultUMA(key_system_uma_prefix_ + uma_name_, 0, SUCCESS);
// Only report time for promise resolution (not rejection).
base::UmaHistogramTimes(key_system_uma_prefix_ + kTimeUMAPrefix + uma_name_,
base::TimeTicks::Now() - creation_time_);
web_cdm_result_.Complete();
}
template <>
inline void CdmResultPromise<CdmKeyInformation::KeyStatus>::resolve(
const CdmKeyInformation::KeyStatus& key_status) {
MarkPromiseSettled();
ReportCdmResultUMA(key_system_uma_prefix_ + uma_name_, 0, SUCCESS);
// Only report time for promise resolution (not rejection).
base::UmaHistogramTimes(key_system_uma_prefix_ + kTimeUMAPrefix + uma_name_,
base::TimeTicks::Now() - creation_time_);
web_cdm_result_.CompleteWithKeyStatus(ConvertCdmKeyStatus(key_status));
}
template <typename... T>
void CdmResultPromise<T...>::reject(CdmPromise::Exception exception_code,
uint32_t system_code,
const std::string& error_message) {
MarkPromiseSettled();
ReportCdmResultUMA(key_system_uma_prefix_ + uma_name_, system_code,
ConvertCdmExceptionToResultForUMA(exception_code));
web_cdm_result_.CompleteWithError(ConvertCdmException(exception_code),
system_code,
blink::WebString::FromUTF8(error_message));
}
} // namespace media
#endif // MEDIA_BLINK_CDM_RESULT_PROMISE_H_
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