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* Copyright 2016 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.
#include <memory>
#include <vector>
#include "webrtc/api/stats/rtcstats_objects.h"
#include "webrtc/api/stats/rtcstatsreport.h"
#include "webrtc/base/asyncinvoker.h"
#include "webrtc/base/refcount.h"
#include "webrtc/base/scoped_ref_ptr.h"
#include "webrtc/base/timeutils.h"
namespace rtc {
class SSLCertificate;
} // namespace rtc
namespace webrtc {
class PeerConnection;
struct SessionStats;
class RTCStatsCollectorCallback : public virtual rtc::RefCountInterface {
virtual ~RTCStatsCollectorCallback() {}
virtual void OnStatsDelivered(
const rtc::scoped_refptr<const RTCStatsReport>& report) = 0;
// All public methods of the collector are to be called on the signaling thread.
// Stats are gathered on the signaling, worker and network threads
// asynchronously. The callback is invoked on the signaling thread. Resulting
// reports are cached for |cache_lifetime_| ms.
class RTCStatsCollector : public virtual rtc::RefCountInterface {
static rtc::scoped_refptr<RTCStatsCollector> Create(
PeerConnection* pc,
int64_t cache_lifetime_us = 50 * rtc::kNumMicrosecsPerMillisec);
// Gets a recent stats report. If there is a report cached that is still fresh
// it is returned, otherwise new stats are gathered and returned. A report is
// considered fresh for |cache_lifetime_| ms. const RTCStatsReports are safe
// to use across multiple threads and may be destructed on any thread.
void GetStatsReport(rtc::scoped_refptr<RTCStatsCollectorCallback> callback);
// Clears the cache's reference to the most recent stats report. Subsequently
// calling |GetStatsReport| guarantees fresh stats.
void ClearCachedStatsReport();
RTCStatsCollector(PeerConnection* pc, int64_t cache_lifetime_us);
// Stats gathering on a particular thread. Calls |AddPartialResults| before
// returning. Virtual for the sake of testing.
virtual void ProducePartialResultsOnSignalingThread(int64_t timestamp_us);
virtual void ProducePartialResultsOnWorkerThread(int64_t timestamp_us);
virtual void ProducePartialResultsOnNetworkThread(int64_t timestamp_us);
// Can be called on any thread.
void AddPartialResults(
const rtc::scoped_refptr<RTCStatsReport>& partial_report);
void AddPartialResults_s(rtc::scoped_refptr<RTCStatsReport> partial_report);
void DeliverCachedReport();
void ProduceCertificateStats_s(
int64_t timestamp_us, const SessionStats& session_stats,
RTCStatsReport* report) const;
void ProduceCertificateStatsFromSSLCertificateAndChain_s(
int64_t timestamp_us, const rtc::SSLCertificate& certificate,
RTCStatsReport* report) const;
void ProducePeerConnectionStats_s(
int64_t timestamp_us, RTCStatsReport* report) const;
PeerConnection* const pc_;
rtc::Thread* const signaling_thread_;
rtc::Thread* const worker_thread_;
rtc::Thread* const network_thread_;
rtc::AsyncInvoker invoker_;
int num_pending_partial_reports_;
int64_t partial_report_timestamp_us_;
rtc::scoped_refptr<RTCStatsReport> partial_report_;
std::vector<rtc::scoped_refptr<RTCStatsCollectorCallback>> callbacks_;
// A timestamp, in microseconds, that is based on a timer that is
// monotonically increasing. That is, even if the system clock is modified the
// difference between the timer and this timestamp is how fresh the cached
// report is.
int64_t cache_timestamp_us_;
int64_t cache_lifetime_us_;
rtc::scoped_refptr<const RTCStatsReport> cached_report_;
} // namespace webrtc