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/*
* Copyright (c) 2021 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.
*/
#pragma once
#include <protocols/errors.h>
#include <protocols/fec_utils.h>
#include <protocols/indexer.h>
#include <protocols/rtc/probe_handler.h>
#include <protocols/rtc/rtc_consts.h>
#include <protocols/transport_protocol.h>
#include <utils/suffix_strategy.h>
#include <deque>
namespace transport {
namespace interface {
class ConsumerSocket;
}
namespace protocol {
namespace rtc {
template <uint32_t LIMIT = MIN_PROBE_SEQ>
class RtcIndexer : public Indexer {
public:
RtcIndexer(implementation::ConsumerSocket *icn_socket,
TransportProtocol *transport)
: Indexer(icn_socket, transport),
first_suffix_(1),
next_suffix_(first_suffix_),
fec_type_(fec::FECType::UNKNOWN),
n_fec_(0),
n_current_fec_(n_fec_) {}
RtcIndexer(RtcIndexer &&other) : Indexer(std::forward<Indexer>(other)) {}
~RtcIndexer() {}
void reset() override {
next_suffix_ = first_suffix_;
n_fec_ = 0;
}
uint32_t checkNextSuffix() const override { return next_suffix_; }
uint32_t getNextSuffix() override {
if (isFec(next_suffix_)) {
if (n_current_fec_) {
auto ret = next_suffix_++;
n_current_fec_--;
return ret;
} else {
n_current_fec_ = n_fec_;
next_suffix_ = nextSource(next_suffix_);
}
} else if (!n_current_fec_) {
n_current_fec_ = n_fec_;
}
return (next_suffix_++ % LIMIT);
}
void setFirstSuffix(uint32_t suffix) override {
first_suffix_ = suffix % LIMIT;
}
uint32_t getFirstSuffix() const override { return first_suffix_; }
uint32_t jumpToIndex(uint32_t index) override {
next_suffix_ = index % LIMIT;
return next_suffix_;
}
void onContentObject(core::Interest &interest,
core::ContentObject &content_object,
bool reassembly) override {
if (reassembly) {
reassembly_->reassemble(content_object);
}
}
/**
* Retrieve the next segment to be reassembled.
*/
uint32_t getNextReassemblySegment() override {
throw errors::RuntimeException(
"Get reassembly segment called on rtc indexer. RTC indexer does not "
"provide reassembly.");
}
bool isFinalSuffixDiscovered() override { return true; }
uint32_t getFinalSuffix() const override { return LIMIT; }
void enableFec(fec::FECType fec_type) override { fec_type_ = fec_type; }
void disableFec() override { fec_type_ = fec::FECType::UNKNOWN; }
void setNFec(uint32_t n_fec) override {
n_fec_ = n_fec;
n_current_fec_ = n_fec_;
}
uint32_t getNFec() const override { return n_fec_; }
bool isFec(uint32_t index) override {
return isFec(fec_type_, index, first_suffix_);
}
double getFecOverhead() const override {
if (fec_type_ == fec::FECType::UNKNOWN) {
return 0;
}
double k = (double)fec::FECUtils::getSourceSymbols(fec_type_);
return (double)n_fec_ / k;
}
double getMaxFecOverhead() const override {
if (fec_type_ == fec::FECType::UNKNOWN) {
return 0;
}
double k = (double)fec::FECUtils::getSourceSymbols(fec_type_);
double n = (double)fec::FECUtils::getBlockSymbols(fec_type_);
return (double)(n - k) / k;
}
static bool isFec(fec::FECType fec_type, uint32_t index,
uint32_t first_suffix) {
if (index < LIMIT) {
return fec::FECUtils::isFec(fec_type, index, first_suffix);
}
return false;
}
static uint32_t nextSource(fec::FECType fec_type, uint32_t index,
uint32_t first_suffix) {
return fec::FECUtils::nextSource(fec_type, index, first_suffix) % LIMIT;
}
private:
uint32_t nextSource(uint32_t index) {
return nextSource(fec_type_, index, first_suffix_);
}
private:
uint32_t first_suffix_;
uint32_t next_suffix_;
fec::FECType fec_type_;
bool fec_enabled_;
uint32_t n_fec_;
uint32_t n_current_fec_;
};
} // namespace rtc
} // namespace protocol
} // namespace transport
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