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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 <src/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <parc/assert/parc_Assert.h>
#include <parc/algol/parc_HashMap.h>
#include <parc/algol/parc_Memory.h>
#include <src/core/nameBitvector.h>
#include <src/strategies/rndSegment.h>
static void _strategyRndSegment_ReceiveObject(StrategyImpl *strategy,
const NumberSet *egressId,
const Message *objectMessage,
Ticks rtt);
static void _strategyRndSegment_OnTimeout(StrategyImpl *strategy,
const NumberSet *egressId);
static NumberSet *_strategyRndSegment_LookupNexthop(
StrategyImpl *strategy, const Message *interestMessage);
static NumberSet *_strategyRndSegment_ReturnNexthops(StrategyImpl *strategy);
static unsigned _strategyRndSegment_CountNexthops(StrategyImpl *strategy);
static void _strategyRndSegment_AddNexthop(StrategyImpl *strategy,
unsigned connectionId);
static void _strategyRndSegment_RemoveNexthop(StrategyImpl *strategy,
unsigned connectionId);
static void _strategyRndSegment_ImplDestroy(StrategyImpl **strategyPtr);
static strategy_type _strategyRndSegment_GetStrategy(StrategyImpl *strategy);
static StrategyImpl _template = {
.context = NULL,
.receiveObject = &_strategyRndSegment_ReceiveObject,
.onTimeout = &_strategyRndSegment_OnTimeout,
.lookupNexthop = &_strategyRndSegment_LookupNexthop,
.returnNexthops = &_strategyRndSegment_ReturnNexthops,
.countNexthops = &_strategyRndSegment_CountNexthops,
.addNexthop = &_strategyRndSegment_AddNexthop,
.removeNexthop = &_strategyRndSegment_RemoveNexthop,
.destroy = &_strategyRndSegment_ImplDestroy,
.getStrategy = &_strategyRndSegment_GetStrategy,
};
struct strategy_rnd_segment;
typedef struct strategy_rnd_segment StrategyRndSegment;
struct strategy_rnd_segment {
NumberSet *nexthops;
NameBitvector *segmentName;
int last_used_face;
};
StrategyImpl *strategyRndSegment_Create() {
StrategyRndSegment *strategy =
parcMemory_AllocateAndClear(sizeof(StrategyRndSegment));
parcAssertNotNull(strategy, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(StrategyRndSegment));
strategy->nexthops = numberSet_Create();
strategy->segmentName = NULL;
strategy->last_used_face = 0;
srand(time(NULL));
StrategyImpl *impl = parcMemory_AllocateAndClear(sizeof(StrategyImpl));
parcAssertNotNull(impl, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(StrategyImpl));
memcpy(impl, &_template, sizeof(StrategyImpl));
impl->context = strategy;
return impl;
}
// =======================================================
// Dispatch API
strategy_type _strategyRndSegment_GetStrategy(StrategyImpl *strategy) {
return SET_STRATEGY_RANDOM_PER_DASH_SEGMENT;
}
static int _select_Nexthop(StrategyRndSegment *strategy) {
unsigned len = numberSet_Length(strategy->nexthops);
if (len == 0) {
return -1;
}
int rnd = (rand() % len);
return numberSet_GetItem(strategy->nexthops, rnd);
}
static void _strategyRndSegment_ReceiveObject(StrategyImpl *strategy,
const NumberSet *egressId,
const Message *objectMessage,
Ticks rtt) {}
static void _strategyRndSegment_OnTimeout(StrategyImpl *strategy,
const NumberSet *egressId) {}
static NumberSet *_strategyRndSegment_LookupNexthop(
StrategyImpl *strategy, const Message *interestMessage) {
StrategyRndSegment *srnd = (StrategyRndSegment *)strategy->context;
unsigned in_connection = message_GetIngressConnectionId(interestMessage);
unsigned nexthopSize = numberSet_Length(srnd->nexthops);
NumberSet *out = numberSet_Create();
if ((nexthopSize == 0) ||
((nexthopSize == 1) &&
numberSet_Contains(srnd->nexthops, in_connection))) {
// there are no output faces or the input face is also the only output face.
// return null to avoid loops
return out;
}
NameBitvector *interestName =
name_GetContentName(message_GetName(interestMessage));
if (srnd->segmentName == NULL) {
srnd->segmentName = nameBitvector_Copy(interestName);
} else if (!nameBitvector_Equals(srnd->segmentName, interestName)) {
nameBitvector_Destroy(&srnd->segmentName);
srnd->segmentName = nameBitvector_Copy(interestName);
} else {
// here we need to check if the output face still exists or if someone erase
// it
if (numberSet_Contains(srnd->nexthops, srnd->last_used_face)) {
// face exists, so keep using it!
numberSet_Add(out, srnd->last_used_face);
return out;
} else {
// the face does not exists anymore, try to find a new face but keep the
// name of the dash segment
}
}
int out_connection;
do {
out_connection = _select_Nexthop(srnd);
} while (out_connection == in_connection);
if (out_connection == -1) {
return out;
}
srnd->last_used_face = out_connection;
numberSet_Add(out, out_connection);
return out;
}
static NumberSet *_strategyRndSegment_ReturnNexthops(StrategyImpl *strategy) {
StrategyRndSegment *srnd = (StrategyRndSegment *)strategy->context;
return srnd->nexthops;
}
unsigned _strategyRndSegment_CountNexthops(StrategyImpl *strategy) {
StrategyRndSegment *srnd = (StrategyRndSegment *)strategy->context;
return numberSet_Length(srnd->nexthops);
}
static void _strategyRndSegment_AddNexthop(StrategyImpl *strategy,
unsigned connectionId) {
StrategyRndSegment *srnd = (StrategyRndSegment *)strategy->context;
if (!numberSet_Contains(srnd->nexthops, connectionId)) {
numberSet_Add(srnd->nexthops, connectionId);
}
}
static void _strategyRndSegment_RemoveNexthop(StrategyImpl *strategy,
unsigned connectionId) {
StrategyRndSegment *srnd = (StrategyRndSegment *)strategy->context;
if (numberSet_Contains(srnd->nexthops, connectionId)) {
numberSet_Remove(srnd->nexthops, connectionId);
}
}
static void _strategyRndSegment_ImplDestroy(StrategyImpl **strategyPtr) {
parcAssertNotNull(strategyPtr, "Parameter must be non-null double pointer");
parcAssertNotNull(*strategyPtr,
"Parameter must dereference to non-null pointer");
StrategyImpl *impl = *strategyPtr;
StrategyRndSegment *strategy = (StrategyRndSegment *)impl->context;
numberSet_Release(&(strategy->nexthops));
if (strategy->segmentName != NULL) {
nameBitvector_Destroy(&strategy->segmentName);
}
parcMemory_Deallocate((void **)&strategy);
parcMemory_Deallocate((void **)&impl);
*strategyPtr = NULL;
}
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