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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 <stddef.h>
#include <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "api/ref_counted_base.h"
#include "api/scoped_refptr.h"
#include "api/stats/rtc_stats.h"
#include "api/units/timestamp.h"
// TODO(tommi): Remove this include after fixing iwyu issue in chromium.
// See: third_party/blink/renderer/platform/peerconnection/
#include "rtc_base/ref_counted_object.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// A collection of stats.
// This is accessible as a map from `RTCStats::id` to `RTCStats`.
class RTC_EXPORT RTCStatsReport final
: public rtc::RefCountedNonVirtual<RTCStatsReport> {
typedef std::map<std::string, std::unique_ptr<const RTCStats>> StatsMap;
class RTC_EXPORT ConstIterator {
ConstIterator(ConstIterator&& other);
ConstIterator& operator++();
ConstIterator& operator++(int);
const RTCStats& operator*() const;
const RTCStats* operator->() const;
bool operator==(const ConstIterator& other) const;
bool operator!=(const ConstIterator& other) const;
friend class RTCStatsReport;
ConstIterator(const rtc::scoped_refptr<const RTCStatsReport>& report,
StatsMap::const_iterator it);
// Reference report to make sure it is kept alive.
rtc::scoped_refptr<const RTCStatsReport> report_;
StatsMap::const_iterator it_;
static rtc::scoped_refptr<RTCStatsReport> Create(Timestamp timestamp);
explicit RTCStatsReport(Timestamp timestamp);
RTCStatsReport(const RTCStatsReport& other) = delete;
rtc::scoped_refptr<RTCStatsReport> Copy() const;
Timestamp timestamp() const { return timestamp_; }
void AddStats(std::unique_ptr<const RTCStats> stats);
// On success, returns a non-owning pointer to `stats`. If the stats ID is not
// unique, `stats` is not inserted and nullptr is returned.
template <typename T>
T* TryAddStats(std::unique_ptr<T> stats) {
T* stats_ptr = stats.get();
if (!stats_
.insert(std::make_pair(std::string(stats->id()), std::move(stats)))
.second) {
return nullptr;
return stats_ptr;
const RTCStats* Get(const std::string& id) const;
size_t size() const { return stats_.size(); }
// Gets the stat object of type `T` by ID, where `T` is any class descending
// from `RTCStats`.
// Returns null if there is no stats object for the given ID or it is the
// wrong type.
template <typename T>
const T* GetAs(const std::string& id) const {
const RTCStats* stats = Get(id);
if (!stats || stats->type() != T::kType) {
return nullptr;
return &stats->cast_to<const T>();
// Removes the stats object from the report, returning ownership of it or null
// if there is no object with `id`.
std::unique_ptr<const RTCStats> Take(const std::string& id);
// Takes ownership of all the stats in `other`, leaving it empty.
void TakeMembersFrom(rtc::scoped_refptr<RTCStatsReport> other);
// Stats iterators. Stats are ordered lexicographically on `RTCStats::id`.
ConstIterator begin() const;
ConstIterator end() const;
// Gets the subset of stats that are of type `T`, where `T` is any class
// descending from `RTCStats`.
template <typename T>
std::vector<const T*> GetStatsOfType() const {
std::vector<const T*> stats_of_type;
for (const RTCStats& stats : *this) {
if (stats.type() == T::kType)
stats_of_type.push_back(&stats.cast_to<const T>());
return stats_of_type;
// Creates a JSON readable string representation of the report,
// listing all of its stats objects.
std::string ToJson() const;
friend class RefCountedNonVirtual<RTCStatsReport>;
~RTCStatsReport() = default;
Timestamp timestamp_;
StatsMap stats_;
} // namespace webrtc