algo-segment.go

/*
 * Copyright (c) 2019  InterDigital Communications, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use algo 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.
 */

package netchar

import (
	"errors"
	"fmt"
	"strconv"
	"strings"
	"time"

	ceModel "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-ctrl-engine-model"
	log "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-logger"
	mod "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-model"
	redis "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-redis"
)

const MAX_THROUGHPUT = 9999999999
const THROUGHPUT_UNIT = 1000000 //convert from Mbps to bps
const DEFAULT_THROUGHPUT_LINK = 1000.0

const metricsDb = 0
const moduleMetrics string = "metrics"

// SegAlgoConfig - Segment Algorithm Config
type SegAlgoConfig struct {
	// Segment config
	MaxBwPerInactiveFlow      float64
	MaxBwPerInactiveFlowFloor float64
	MinActivityThreshold      float64
	IncrementalStep           float64
	InactivityIncrementalStep float64
	TolerationThreshold       float64
	ActionUpperThreshold      float64

	// Debug Config
	IsPercentage bool
	LogVerbose   bool
}

// SegAlgoSegment -
type SegAlgoSegment struct {
	Name                      string
	ConfiguredNetChar         NetChar
	MaxFairShareBwPerFlow     float64
	CurrentThroughput         float64
	MaxBwPerInactiveFlow      float64
	MinActivityThreshold      float64
	IncrementalStep           float64
	InactivityIncrementalStep float64
	TolerationThreshold       float64
	ActionUpperThreshold      float64
	Flows                     []*SegAlgoFlow
}

// SegAlgoFlow -
type SegAlgoFlow struct {
	Name                          string
	SrcNetElem                    string
	DstNetElem                    string
	ConfiguredNetChar             NetChar
	AppliedNetChar                NetChar
	ComputedLatency               float64
	ComputedJitter                float64
	ComputedPacketLoss            float64
	AllocatedThroughput           float64 //allocated
	AllocatedThroughputLowerBound float64 //allocated
	AllocatedThroughputUpperBound float64 //allocated
	MaxPlannedThroughput          float64
	MaxPlannedLowerBound          float64
	MaxPlannedUpperBound          float64
	PlannedThroughput             float64
	PlannedLowerBound             float64
	PlannedUpperBound             float64
	CurrentThroughput             float64 //measured
	CurrentThroughputEgress       float64 //measured
	Path                          *SegAlgoPath
	UpdateRequired                bool
}

// SegAlgoPath -
type SegAlgoPath struct {
	Name     string
	Segments []*SegAlgoSegment
}

// SegAlgoNetElem -
type SegAlgoNetElem struct {
	Name              string
	Type              string
	PhyLocName        string
	PoaName           string
	ZoneName          string
	DomainName        string
	ConfiguredNetChar NetChar
}

// SegmentAlgorithm -
type SegmentAlgorithm struct {
	FlowMap    map[string]*SegAlgoFlow
	SegmentMap map[string]*SegAlgoSegment
	Config     SegAlgoConfig
	rc         *redis.Connector
}

// NewSegmentAlgorithm - Create, Initialize and connect
func NewSegmentAlgorithm(redisAddr string) (*SegmentAlgorithm, error) {
	// Create new instance & set default config
	var err error
	var algo SegmentAlgorithm
	algo.FlowMap = make(map[string]*SegAlgoFlow)
	algo.SegmentMap = make(map[string]*SegAlgoSegment)
	algo.Config.MaxBwPerInactiveFlow = 20.0
	algo.Config.MaxBwPerInactiveFlowFloor = 6.0
	algo.Config.MinActivityThreshold = 0.3
	algo.Config.IncrementalStep = 3.0
	algo.Config.InactivityIncrementalStep = 1.0
	algo.Config.ActionUpperThreshold = 1.0
	algo.Config.TolerationThreshold = 4.0
	algo.Config.IsPercentage = true

	// Create connection to Metrics Redis DB & flush entries
	algo.rc, err = redis.NewConnector(redisAddr, metricsDb)
	if err != nil {
		log.Error("Failed connection to Metrics redis DB. Error: ", err)
		return nil, err
	}
	_ = algo.rc.DBFlush(moduleMetrics)
	log.Info("Connected to Metrics redis DB")

	return &algo, nil
}

// ProcessScenario -
func (algo *SegmentAlgorithm) ProcessScenario(model *mod.Model) error {
	var netElemList []SegAlgoNetElem

	// Process empty scenario
	if model.GetScenarioName() == "" {
		// Remove any existing metrics
		algo.deleteMetricsEntries()
		//reset the map
		algo.FlowMap = make(map[string]*SegAlgoFlow)
	}

	// Clear segment & flow maps
	algo.SegmentMap = make(map[string]*SegAlgoSegment)
	// Process active scenario
	procNames := model.GetNodeNames("CLOUD-APP", "EDGE-APP", "UE-APP")

	// Create NetElem for each scenario process
	for _, name := range procNames {
		// Retrieve node & context from model
		node := model.GetNode(name)
		if node == nil {
			err := errors.New("Error finding process: " + name)
			return err
		}
		proc, ok := node.(*ceModel.Process)
		if !ok {
			err := errors.New("Error casting process: " + name)
			return err
		}
		ctx := model.GetNodeContext(name)
		if ctx == nil {
			err := errors.New("Error getting context for process: " + name)
			return err
		}
		nodeCtx, ok := ctx.(*mod.NodeContext)
		if !ok {
			err := errors.New("Error casting context for process: " + name)
			return err
		}

		// Create & populate new element
		element := new(SegAlgoNetElem)
		element.Name = proc.Name
		element.PhyLocName = nodeCtx.Parents[mod.PhyLoc]
		element.DomainName = nodeCtx.Parents[mod.Domain]

		// Type-specific values
		element.Type = model.GetNodeType(element.PhyLocName)
		if element.Type == "UE" || element.Type == "FOG" {
			element.PoaName = nodeCtx.Parents[mod.NetLoc]
		}
		if element.Type != "DC" {