ConnectionManagerImpl::ActiveStream::ActiveStream(ConnectionManagerImpl& connection_manager,
                                                  uint32_t buffer_limit,
                                                  Buffer::BufferMemoryAccountSharedPtr account)
    : connection_manager_(connection_manager),
      stream_id_(connection_manager.random_generator_.random()),
      filter_manager_(*this, connection_manager_.read_callbacks_->connection().dispatcher(),
                      connection_manager_.read_callbacks_->connection(), stream_id_,
                      std::move(account), connection_manager_.config_.proxy100Continue(),
                      buffer_limit, connection_manager_.config_.filterFactory(),
                      connection_manager_.config_.localReply(),
                      connection_manager_.codec_->protocol(), connection_manager_.timeSource(),
                      connection_manager_.read_callbacks_->connection().streamInfo().filterState(),
                      StreamInfo::FilterState::LifeSpan::Connection),
      request_response_timespan_(new Stats::HistogramCompletableTimespanImpl(
          connection_manager_.stats_.named_.downstream_rq_time_,
          connection_manager_.timeSource())) {
  ASSERT(!connection_manager.config_.isRoutable() ||
             ((connection_manager.config_.routeConfigProvider() == nullptr &&
               connection_manager.config_.scopedRouteConfigProvider() != nullptr) ||
              (connection_manager.config_.routeConfigProvider() != nullptr &&
               connection_manager.config_.scopedRouteConfigProvider() == nullptr)),
         "Either routeConfigProvider or scopedRouteConfigProvider should be set in "
         "ConnectionManagerImpl.");
  for (const AccessLog::InstanceSharedPtr& access_log : connection_manager_.config_.accessLogs()) {
    filter_manager_.addAccessLogHandler(access_log);
  }

  filter_manager_.streamInfo().setRequestIDProvider(
      connection_manager.config_.requestIDExtension());

  if (connection_manager_.config_.isRoutable() &&
      connection_manager.config_.routeConfigProvider() != nullptr) {
    route_config_update_requester_ =
        std::make_unique<ConnectionManagerImpl::RdsRouteConfigUpdateRequester>(
            connection_manager.config_.routeConfigProvider(), *this);
  } else if (connection_manager_.config_.isRoutable() &&
             connection_manager.config_.scopedRouteConfigProvider() != nullptr) {
    route_config_update_requester_ =
        std::make_unique<ConnectionManagerImpl::RdsRouteConfigUpdateRequester>(
            connection_manager.config_.scopedRouteConfigProvider(), *this);
  }
  ScopeTrackerScopeState scope(this,
                               connection_manager_.read_callbacks_->connection().dispatcher());

  connection_manager_.stats_.named_.downstream_rq_total_.inc();
  connection_manager_.stats_.named_.downstream_rq_active_.inc();
  if (connection_manager_.codec_->protocol() == Protocol::Http2) {
    connection_manager_.stats_.named_.downstream_rq_http2_total_.inc();
  } else if (connection_manager_.codec_->protocol() == Protocol::Http3) {
    connection_manager_.stats_.named_.downstream_rq_http3_total_.inc();
  } else {
    connection_manager_.stats_.named_.downstream_rq_http1_total_.inc();
  }

  if (connection_manager_.config_.streamIdleTimeout().count()) {
    idle_timeout_ms_ = connection_manager_.config_.streamIdleTimeout();
    stream_idle_timer_ =
        connection_manager_.read_callbacks_->connection().dispatcher().createScaledTimer(
            Event::ScaledTimerType::HttpDownstreamIdleStreamTimeout,
            [this]() -> void { onIdleTimeout(); });
    resetIdleTimer();
  }

  if (connection_manager_.config_.requestTimeout().count()) {
    std::chrono::milliseconds request_timeout = connection_manager_.config_.requestTimeout();
    request_timer_ = connection_manager.read_callbacks_->connection().dispatcher().createTimer(
        [this]() -> void { onRequestTimeout(); });
    request_timer_->enableTimer(request_timeout, this);
  }

  if (connection_manager_.config_.requestHeadersTimeout().count()) {
    std::chrono::milliseconds request_headers_timeout =
        connection_manager_.config_.requestHeadersTimeout();
    request_header_timer_ =
        connection_manager.read_callbacks_->connection().dispatcher().createTimer(
            [this]() -> void { onRequestHeaderTimeout(); });
    request_header_timer_->enableTimer(request_headers_timeout, this);
  }

  const auto max_stream_duration = connection_manager_.config_.maxStreamDuration();
  if (max_stream_duration.has_value() && max_stream_duration.value().count()) {
    max_stream_duration_timer_ =
        connection_manager.read_callbacks_->connection().dispatcher().createTimer(
            [this]() -> void { onStreamMaxDurationReached(); });
    max_stream_duration_timer_->enableTimer(connection_manager_.config_.maxStreamDuration().value(),
                                            this);
  }
}