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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/webrtc_event_log_data.h"
#include <utility>
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
namespace remoting::protocol {
WebrtcEventLogData::WebrtcEventLogData() {
// See the caveat for base::circular_deque::reserve(). Calling reserve() is
// OK here, since items are never removed until the list reaches its maximum
// allowed size.
sections_.reserve(max_sections_);
}
WebrtcEventLogData::~WebrtcEventLogData() = default;
void WebrtcEventLogData::SetMaxSectionSizeForTest(int max_section_size) {
max_section_size_ = max_section_size;
}
void WebrtcEventLogData::SetMaxSectionsForTest(int max_sections) {
max_sections_ = max_sections;
sections_.reserve(max_sections_);
}
base::circular_deque<WebrtcEventLogData::LogSection>
WebrtcEventLogData::TakeLogData() {
auto result = std::move(sections_);
// The |sections_| container is still valid but unspecified. Call Clear() to
// be certain it is empty (and the correct capacity is reserved).
Clear();
return result;
}
void WebrtcEventLogData::Write(std::string_view log_event) {
if (base::checked_cast<int>(log_event.size()) > max_section_size_) {
LOG(WARNING) << "Oversized RTC log event: size = " << log_event.size();
}
if (NeedNewSection(log_event.size())) {
CreateNewSection();
}
// Append the log_event to the end of the latest section.
auto& section = sections_.back();
section.insert(section.end(), log_event.begin(), log_event.end());
}
void WebrtcEventLogData::Clear() {
sections_.clear();
sections_.reserve(max_sections_);
}
bool WebrtcEventLogData::NeedNewSection(size_t log_event_size) const {
if (sections_.empty()) {
return true;
}
// The event log entries are packet headers generated by WebRTC, and it is
// assumed that the sizes are small enough to prevent integer overflow.
return base::checked_cast<int>(sections_.back().size() + log_event_size) >
max_section_size_;
}
void WebrtcEventLogData::CreateNewSection() {
if (static_cast<int>(sections_.size()) >= max_sections_) {
// Discard oldest section to make room.
sections_.pop_front();
}
sections_.emplace_back();
sections_.back().reserve(max_section_size_);
}
} // namespace remoting::protocol
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