PeerConnection[Interface]::GetStats(RTCStatsCollectorCallback*) added.

webrtc/stats/rtcstatscollector.cc

Index: webrtc/stats/rtcstatscollector.cc
diff --git a/webrtc/stats/rtcstatscollector.cc b/webrtc/stats/rtcstatscollector.cc
deleted file mode 100644
index 3ff41558b305516cda7bf8e48c0cd36119881f94..0000000000000000000000000000000000000000
--- a/webrtc/stats/rtcstatscollector.cc
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- *  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 "webrtc/stats/rtcstatscollector.h"
-
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "webrtc/api/peerconnection.h"
-#include "webrtc/base/checks.h"
-
-namespace webrtc {
-
-rtc::scoped_refptr<RTCStatsCollector> RTCStatsCollector::Create(
-    PeerConnection* pc, int64_t cache_lifetime_us) {
-  return rtc::scoped_refptr<RTCStatsCollector>(
-      new rtc::RefCountedObject<RTCStatsCollector>(pc, cache_lifetime_us));
-}
-
-RTCStatsCollector::RTCStatsCollector(PeerConnection* pc,
-                                     int64_t cache_lifetime_us)
-    : pc_(pc),
-      signaling_thread_(pc->session()->signaling_thread()),
-      worker_thread_(pc->session()->worker_thread()),
-      network_thread_(pc->session()->network_thread()),
-      num_pending_partial_reports_(0),
-      partial_report_timestamp_us_(0),
-      cache_timestamp_us_(0),
-      cache_lifetime_us_(cache_lifetime_us) {
-  RTC_DCHECK(pc_);
-  RTC_DCHECK(signaling_thread_);
-  RTC_DCHECK(worker_thread_);
-  RTC_DCHECK(network_thread_);
-  RTC_DCHECK_GE(cache_lifetime_us_, 0);
-}
-
-void RTCStatsCollector::GetStatsReport(
-    rtc::scoped_refptr<RTCStatsCollectorCallback> callback) {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-  RTC_DCHECK(callback);
-  callbacks_.push_back(callback);
-
-  // "Now" using a monotonically increasing timer.
-  int64_t cache_now_us = rtc::TimeMicros();
-  if (cached_report_ &&
-      cache_now_us - cache_timestamp_us_ <= cache_lifetime_us_) {
-    // We have a fresh cached report to deliver.
-    DeliverCachedReport();
-  } else if (!num_pending_partial_reports_) {
-    // Only start gathering stats if we're not already gathering stats. In the
-    // case of already gathering stats, |callback_| will be invoked when there
-    // are no more pending partial reports.
-
-    // "Now" using a system clock, relative to the UNIX epoch (Jan 1, 1970,
-    // UTC), in microseconds. The system clock could be modified and is not
-    // necessarily monotonically increasing.
-    int64_t timestamp_us = rtc::TimeUTCMicros();
-
-    num_pending_partial_reports_ = 3;
-    partial_report_timestamp_us_ = cache_now_us;
-    invoker_.AsyncInvoke<void>(RTC_FROM_HERE, signaling_thread_,
-        rtc::Bind(&RTCStatsCollector::ProducePartialResultsOnSignalingThread,
-            rtc::scoped_refptr<RTCStatsCollector>(this), timestamp_us));
-    invoker_.AsyncInvoke<void>(RTC_FROM_HERE, worker_thread_,
-        rtc::Bind(&RTCStatsCollector::ProducePartialResultsOnWorkerThread,
-            rtc::scoped_refptr<RTCStatsCollector>(this), timestamp_us));
-    invoker_.AsyncInvoke<void>(RTC_FROM_HERE, network_thread_,
-        rtc::Bind(&RTCStatsCollector::ProducePartialResultsOnNetworkThread,
-            rtc::scoped_refptr<RTCStatsCollector>(this), timestamp_us));
-  }
-}
-
-void RTCStatsCollector::ClearCachedStatsReport() {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-  cached_report_ = nullptr;
-}
-
-void RTCStatsCollector::ProducePartialResultsOnSignalingThread(
-    int64_t timestamp_us) {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create();
-
-  report->AddStats(ProducePeerConnectionStats_s(timestamp_us));
-
-  AddPartialResults(report);
-}
-
-void RTCStatsCollector::ProducePartialResultsOnWorkerThread(
-    int64_t timestamp_us) {
-  RTC_DCHECK(worker_thread_->IsCurrent());
-  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create();
-
-  // TODO(hbos): Gather stats on worker thread.
-
-  AddPartialResults(report);
-}
-
-void RTCStatsCollector::ProducePartialResultsOnNetworkThread(
-    int64_t timestamp_us) {
-  RTC_DCHECK(network_thread_->IsCurrent());
-  rtc::scoped_refptr<RTCStatsReport> report = RTCStatsReport::Create();
-
-  // TODO(hbos): Gather stats on network thread.
-
-  AddPartialResults(report);
-}
-
-void RTCStatsCollector::AddPartialResults(
-    const rtc::scoped_refptr<RTCStatsReport>& partial_report) {
-  if (!signaling_thread_->IsCurrent()) {
-    invoker_.AsyncInvoke<void>(RTC_FROM_HERE, signaling_thread_,
-        rtc::Bind(&RTCStatsCollector::AddPartialResults_s,
-                  rtc::scoped_refptr<RTCStatsCollector>(this),
-                  partial_report));
-    return;
-  }
-  AddPartialResults_s(partial_report);
-}
-
-void RTCStatsCollector::AddPartialResults_s(
-    rtc::scoped_refptr<RTCStatsReport> partial_report) {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-  RTC_DCHECK_GT(num_pending_partial_reports_, 0);
-  if (!partial_report_)
-    partial_report_ = partial_report;
-  else
-    partial_report_->TakeMembersFrom(partial_report);
-  --num_pending_partial_reports_;
-  if (!num_pending_partial_reports_) {
-    cache_timestamp_us_ = partial_report_timestamp_us_;
-    cached_report_ = partial_report_;
-    partial_report_ = nullptr;
-    DeliverCachedReport();
-  }
-}
-
-void RTCStatsCollector::DeliverCachedReport() {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-  RTC_DCHECK(!callbacks_.empty());
-  RTC_DCHECK(cached_report_);
-  for (const rtc::scoped_refptr<RTCStatsCollectorCallback>& callback :
-       callbacks_) {
-    callback->OnStatsDelivered(cached_report_);
-  }
-  callbacks_.clear();
-}
-
-std::unique_ptr<RTCPeerConnectionStats>
-RTCStatsCollector::ProducePeerConnectionStats_s(int64_t timestamp_us) const {
-  RTC_DCHECK(signaling_thread_->IsCurrent());
-  // TODO(hbos): If data channels are removed from the peer connection this will
-  // yield incorrect counts. Address before closing crbug.com/636818. See
-  // https://w3c.github.io/webrtc-stats/webrtc-stats.html#pcstats-dict*.
-  uint32_t data_channels_opened = 0;
-  const std::vector<rtc::scoped_refptr<DataChannel>>& data_channels =
-      pc_->sctp_data_channels();
-  for (const rtc::scoped_refptr<DataChannel>& data_channel : data_channels) {
-    if (data_channel->state() == DataChannelInterface::kOpen)
-      ++data_channels_opened;
-  }
-  // There is always just one |RTCPeerConnectionStats| so its |id| can be a
-  // constant.
-  std::unique_ptr<RTCPeerConnectionStats> stats(
-    new RTCPeerConnectionStats("RTCPeerConnection", timestamp_us));
-  stats->data_channels_opened = data_channels_opened;
-  stats->data_channels_closed = static_cast<uint32_t>(data_channels.size()) -
-                                data_channels_opened;
-  return stats;
-}
-
-}  // namespace webrtc