1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/pc/usage_pattern.cc b/third_party/libwebrtc/pc/usage_pattern.cc
new file mode 100644
index 0000000000..848472148f
--- /dev/null
+++ b/third_party/libwebrtc/pc/usage_pattern.cc
@@ -0,0 +1,49 @@
+/*
+ *  Copyright 2020 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 "pc/usage_pattern.h"
+
+#include "api/peer_connection_interface.h"
+#include "rtc_base/logging.h"
+#include "system_wrappers/include/metrics.h"
+
+namespace webrtc {
+
+void UsagePattern::NoteUsageEvent(UsageEvent event) {
+  usage_event_accumulator_ |= static_cast<int>(event);
+}
+
+void UsagePattern::ReportUsagePattern(PeerConnectionObserver* observer) const {
+  RTC_DLOG(LS_INFO) << "Usage signature is " << usage_event_accumulator_;
+  RTC_HISTOGRAM_ENUMERATION_SPARSE("WebRTC.PeerConnection.UsagePattern",
+                                   usage_event_accumulator_,
+                                   static_cast<int>(UsageEvent::MAX_VALUE));
+  const int bad_bits =
+      static_cast<int>(UsageEvent::SET_LOCAL_DESCRIPTION_SUCCEEDED) |
+      static_cast<int>(UsageEvent::CANDIDATE_COLLECTED);
+  const int good_bits =
+      static_cast<int>(UsageEvent::SET_REMOTE_DESCRIPTION_SUCCEEDED) |
+      static_cast<int>(UsageEvent::REMOTE_CANDIDATE_ADDED) |
+      static_cast<int>(UsageEvent::ICE_STATE_CONNECTED);
+  if ((usage_event_accumulator_ & bad_bits) == bad_bits &&
+      (usage_event_accumulator_ & good_bits) == 0) {
+    // If called after close(), we can't report, because observer may have
+    // been deallocated, and therefore pointer is null. Write to log instead.
+    if (observer) {
+      observer->OnInterestingUsage(usage_event_accumulator_);
+    } else {
+      RTC_LOG(LS_INFO) << "Interesting usage signature "
+                       << usage_event_accumulator_
+                       << " observed after observer shutdown";
+    }
+  }
+}
+
+}  // namespace webrtc