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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef LOGGING_RTC_EVENT_LOG_RTC_EVENT_LOG_IMPL_H_
#define LOGGING_RTC_EVENT_LOG_RTC_EVENT_LOG_IMPL_H_
#include <cstddef>
#include <cstdint>
#include <deque>
#include <memory>
#include <string>
#include "absl/strings/string_view.h"
#include "api/rtc_event_log/rtc_event.h"
#include "api/rtc_event_log/rtc_event_log.h"
#include "api/rtc_event_log_output.h"
#include "api/sequence_checker.h"
#include "api/task_queue/task_queue_factory.h"
#include "logging/rtc_event_log/encoder/rtc_event_log_encoder.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/task_queue.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
class RtcEventLogImpl final : public RtcEventLog {
public:
// The max number of events that the history can store.
static constexpr size_t kMaxEventsInHistory = 10000;
// The max number of events that the config history can store.
// The config-history is supposed to be unbounded, but needs to have some
// bound to prevent an attack via unreasonable memory use.
static constexpr size_t kMaxEventsInConfigHistory = 1000;
RtcEventLogImpl(
std::unique_ptr<RtcEventLogEncoder> encoder,
TaskQueueFactory* task_queue_factory,
size_t max_events_in_history = kMaxEventsInHistory,
size_t max_config_events_in_history = kMaxEventsInConfigHistory);
RtcEventLogImpl(const RtcEventLogImpl&) = delete;
RtcEventLogImpl& operator=(const RtcEventLogImpl&) = delete;
~RtcEventLogImpl() override;
static std::unique_ptr<RtcEventLogEncoder> CreateEncoder(
EncodingType encoding_type);
// TODO(eladalon): We should change these name to reflect that what we're
// actually starting/stopping is the output of the log, not the log itself.
bool StartLogging(std::unique_ptr<RtcEventLogOutput> output,
int64_t output_period_ms) override;
void StopLogging() override;
void StopLogging(std::function<void()> callback) override;
// Records event into `recent_` on current thread, and schedules the output on
// task queue if the buffers are full or `output_period_ms_` is expired.
void Log(std::unique_ptr<RtcEvent> event) override;
private:
using EventDeque = std::deque<std::unique_ptr<RtcEvent>>;
struct EventHistories {
EventDeque config_history;
EventDeque history;
};
// Helper to extract and clear `recent_`.
EventHistories ExtractRecentHistories() RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
void LogToMemory(std::unique_ptr<RtcEvent> event)
RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
void LogEventsToOutput(EventHistories histories) RTC_RUN_ON(task_queue_);
void StopOutput() RTC_RUN_ON(task_queue_);
void WriteConfigsAndHistoryToOutput(absl::string_view encoded_configs,
absl::string_view encoded_history)
RTC_RUN_ON(task_queue_);
void WriteToOutput(absl::string_view output_string) RTC_RUN_ON(task_queue_);
void StopLoggingInternal() RTC_RUN_ON(task_queue_);
bool ShouldOutputImmediately() RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
void ScheduleOutput() RTC_RUN_ON(task_queue_);
// Max size of event history.
const size_t max_events_in_history_;
// Max size of config event history.
const size_t max_config_events_in_history_;
// History containing all past configuration events.
EventDeque all_config_history_ RTC_GUARDED_BY(task_queue_);
// `config_history` containing the most recent configuration events.
// `history` containing the most recent (non-configuration) events (~10s).
EventHistories recent_ RTC_GUARDED_BY(mutex_);
std::unique_ptr<RtcEventLogEncoder> event_encoder_
RTC_GUARDED_BY(task_queue_);
std::unique_ptr<RtcEventLogOutput> event_output_ RTC_GUARDED_BY(task_queue_);
int64_t output_period_ms_ RTC_GUARDED_BY(task_queue_);
int64_t last_output_ms_ RTC_GUARDED_BY(task_queue_);
RTC_NO_UNIQUE_ADDRESS SequenceChecker logging_state_checker_;
bool logging_state_started_ RTC_GUARDED_BY(mutex_) = false;
bool immediately_output_mode_ RTC_GUARDED_BY(mutex_) = false;
bool need_schedule_output_ RTC_GUARDED_BY(mutex_) = false;
// Since we are posting tasks bound to `this`, it is critical that the event
// log and its members outlive `task_queue_`. Keep the `task_queue_`
// last to ensure it destructs first, or else tasks living on the queue might
// access other members after they've been torn down.
std::unique_ptr<rtc::TaskQueue> task_queue_;
Mutex mutex_;
};
} // namespace webrtc
#endif // LOGGING_RTC_EVENT_LOG_RTC_EVENT_LOG_IMPL_H_
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