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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <hicn/transport/interfaces/rtc_socket_producer.h>
#include <stdlib.h>
#include <time.h>
#define NACK_HEADER_SIZE 8 // bytes
#define TIMESTAMP_LEN 8 // bytes
#define TCP_HEADER_SIZE 20
#define IP6_HEADER_SIZE 40
#define INIT_PACKET_PRODUCTION_RATE 100 // pps random value (almost 1Mbps)
#define STATS_INTERVAL_DURATION 500 // ms
#define INTEREST_LIFETIME_REDUCTION_FACTOR 0.8
// NACK HEADER
// +-----------------------------------------+
// | 4 bytes: current segment in production |
// +-----------------------------------------+
// | 4 bytes: production rate (bytes x sec) |
// +-----------------------------------------+
// may require additional field (Rate for multiple qualities, ...)
//
namespace transport {
namespace interface {
RTCProducerSocket::RTCProducerSocket(asio::io_service &io_service)
: ProducerSocket(io_service),
currentSeg_(1),
nack_(std::make_shared<ContentObject>()),
producedBytes_(0),
producedPackets_(0),
bytesProductionRate_(0),
packetsProductionRate_(INIT_PACKET_PRODUCTION_RATE),
perSecondFactor_(1000 / STATS_INTERVAL_DURATION) {
auto nack_payload = utils::MemBuf::create(NACK_HEADER_SIZE);
nack_payload->append(NACK_HEADER_SIZE);
nack_->appendPayload(std::move(nack_payload));
lastStats_ = std::chrono::steady_clock::now();
srand((unsigned int)time(NULL));
prodLabel_ = ((rand() % 255) << 24UL);
}
RTCProducerSocket::RTCProducerSocket()
: ProducerSocket(),
currentSeg_(1),
nack_(std::make_shared<ContentObject>()),
producedBytes_(0),
producedPackets_(0),
bytesProductionRate_(0),
packetsProductionRate_(INIT_PACKET_PRODUCTION_RATE),
perSecondFactor_(1000 / STATS_INTERVAL_DURATION) {
auto nack_payload = utils::MemBuf::create(NACK_HEADER_SIZE);
nack_payload->append(NACK_HEADER_SIZE);
nack_->appendPayload(std::move(nack_payload));
lastStats_ = std::chrono::steady_clock::now();
srand((unsigned int)time(NULL));
prodLabel_ = ((rand() % 255) << 24UL);
}
RTCProducerSocket::~RTCProducerSocket() {}
void RTCProducerSocket::registerName(Prefix &producer_namespace) {
ProducerSocket::registerPrefix(producer_namespace);
flowName_ = producer_namespace.getName();
if (flowName_.getType() == HNT_CONTIGUOUS_V4 ||
flowName_.getType() == HNT_IOV_V4) {
headerSize_ = sizeof(hicn_v6_hdr_t::ip);
} else if (flowName_.getType() == HNT_CONTIGUOUS_V6 ||
flowName_.getType() == HNT_IOV_V6) {
headerSize_ = sizeof(hicn_v4_hdr_t::ip);
} else {
throw errors::RuntimeException("Unknown name format.");
}
headerSize_ += TCP_HEADER_SIZE;
}
void RTCProducerSocket::updateStats(uint32_t packet_size) {
producedBytes_ += packet_size;
producedPackets_++;
std::chrono::steady_clock::duration duration =
std::chrono::steady_clock::now() - lastStats_;
if (std::chrono::duration_cast<std::chrono::milliseconds>(duration).count() >=
STATS_INTERVAL_DURATION) {
lastStats_ = std::chrono::steady_clock::now();
bytesProductionRate_ = producedBytes_ * perSecondFactor_;
packetsProductionRate_ = producedPackets_ * perSecondFactor_;
producedBytes_ = 0;
producedPackets_ = 0;
}
}
void RTCProducerSocket::produce(const uint8_t *buf, size_t buffer_size) {
if (TRANSPORT_EXPECT_FALSE(buffer_size == 0)) {
return;
}
if (TRANSPORT_EXPECT_FALSE((buffer_size + headerSize_ + TIMESTAMP_LEN) >
data_packet_size_)) {
return;
}
updateStats((uint32_t)(buffer_size + headerSize_ + TIMESTAMP_LEN));
ContentObject content_object(flowName_.setSuffix(currentSeg_));
uint64_t timestamp = std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch())
.count();
auto payload = utils::MemBuf::create(buffer_size + TIMESTAMP_LEN);
memcpy(payload->writableData(), ×tamp, TIMESTAMP_LEN);
memcpy(payload->writableData() + TIMESTAMP_LEN, buf, buffer_size);
payload->append(buffer_size + TIMESTAMP_LEN);
content_object.appendPayload(std::move(payload));
content_object.setLifetime(1000); // XXX this should be set by the APP
content_object.setPathLabel(prodLabel_);
portal_->sendContentObject(content_object);
currentSeg_++;
}
void RTCProducerSocket::onInterest(Interest::Ptr &&interest) {
uint32_t interestSeg = interest->getName().getSuffix();
uint32_t lifetime = interest->getLifetime();
uint32_t max_gap;
// XXX
// packetsProductionRate_ is modified by another thread in updateStats
// this should be safe since I just read here. but, you never know.
max_gap = (uint32_t)floor(
(double)((double)((double)lifetime * INTEREST_LIFETIME_REDUCTION_FACTOR /
1000.0) *
(double)packetsProductionRate_));
if (interestSeg < currentSeg_ || interestSeg > (max_gap + currentSeg_)) {
sendNack(*interest);
}
// else drop packet
}
void RTCProducerSocket::sendNack(const Interest &interest) {
nack_->setName(interest.getName());
uint32_t *payload_ptr = (uint32_t *)nack_->getPayload().data();
*payload_ptr = currentSeg_;
*(++payload_ptr) = bytesProductionRate_;
nack_->setLifetime(0);
nack_->setPathLabel(prodLabel_);
portal_->sendContentObject(*nack_);
}
} // namespace interface
} // end namespace transport
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