1 files changed, 132 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/test/metrics/metrics_accumulator.cc b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.cc
new file mode 100644
index 0000000000..c34396be97
--- /dev/null
+++ b/third_party/libwebrtc/api/test/metrics/metrics_accumulator.cc
@@ -0,0 +1,132 @@
+/*
+ *  Copyright (c) 2022 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 "api/test/metrics/metrics_accumulator.h"
+
+#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/numerics/samples_stats_counter.h"
+#include "api/test/metrics/metric.h"
+#include "api/units/timestamp.h"
+#include "rtc_base/synchronization/mutex.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+Metric::Stats ToStats(const SamplesStatsCounter& values) {
+  if (values.IsEmpty()) {
+    return Metric::Stats();
+  }
+  return Metric::Stats{.mean = values.GetAverage(),
+                       .stddev = values.GetStandardDeviation(),
+                       .min = values.GetMin(),
+                       .max = values.GetMax()};
+}
+
+Metric SetTimeseries(const Metric& prototype,
+                     const SamplesStatsCounter& counter) {
+  Metric output(prototype);
+  Metric::TimeSeries time_series;
+  for (const SamplesStatsCounter::StatsSample& sample :
+       counter.GetTimedSamples()) {
+    time_series.samples.push_back(
+        Metric::TimeSeries::Sample{.timestamp = sample.time,
+                                   .value = sample.value,
+                                   .sample_metadata = sample.metadata});
+  }
+  output.time_series = std::move(time_series);
+  output.stats = ToStats(counter);
+  return output;
+}
+
+}  // namespace
+
+bool operator<(const MetricsAccumulator::MetricKey& a,
+               const MetricsAccumulator::MetricKey& b) {
+  if (a.test_case_name < b.test_case_name) {
+    return true;
+  } else if (a.test_case_name > b.test_case_name) {
+    return false;
+  } else {
+    return a.metric_name < b.metric_name;
+  }
+}
+
+bool MetricsAccumulator::AddSample(
+    absl::string_view metric_name,
+    absl::string_view test_case_name,
+    double value,
+    Timestamp timestamp,
+    std::map<std::string, std::string> point_metadata) {
+  MutexLock lock(&mutex_);
+  bool created;
+  MetricValue* metric_value =
+      GetOrCreateMetric(metric_name, test_case_name, &created);
+  metric_value->counter.AddSample(
+      SamplesStatsCounter::StatsSample{.value = value,
+                                       .time = timestamp,
+                                       .metadata = std::move(point_metadata)});
+  return created;
+}
+
+bool MetricsAccumulator::AddMetricMetadata(
+    absl::string_view metric_name,
+    absl::string_view test_case_name,
+    Unit unit,
+    ImprovementDirection improvement_direction,
+    std::map<std::string, std::string> metric_metadata) {
+  MutexLock lock(&mutex_);
+  bool created;
+  MetricValue* metric_value =
+      GetOrCreateMetric(metric_name, test_case_name, &created);
+  metric_value->metric.unit = unit;
+  metric_value->metric.improvement_direction = improvement_direction;
+  metric_value->metric.metric_metadata = std::move(metric_metadata);
+  return created;
+}
+
+std::vector<Metric> MetricsAccumulator::GetCollectedMetrics() const {
+  MutexLock lock(&mutex_);
+  std::vector<Metric> out;
+  out.reserve(metrics_.size());
+  for (const auto& [unused_key, metric_value] : metrics_) {
+    out.push_back(SetTimeseries(metric_value.metric, metric_value.counter));
+  }
+  return out;
+}
+
+MetricsAccumulator::MetricValue* MetricsAccumulator::GetOrCreateMetric(
+    absl::string_view metric_name,
+    absl::string_view test_case_name,
+    bool* created) {
+  MetricKey key(metric_name, test_case_name);
+  auto it = metrics_.find(key);
+  if (it != metrics_.end()) {
+    *created = false;
+    return &it->second;
+  }
+  *created = true;
+
+  Metric metric{
+      .name = key.metric_name,
+      .unit = Unit::kUnitless,
+      .improvement_direction = ImprovementDirection::kNeitherIsBetter,
+      .test_case = key.test_case_name,
+  };
+  return &metrics_.emplace(key, MetricValue{.metric = std::move(metric)})
+              .first->second;
+}
+
+}  // namespace test
+}  // namespace webrtc