loc-serv.go

/*
 * Copyright (c) 2019  InterDigital Communications, Inc
 *
 * 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.
 */

package server

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"sync"
	"time"

	sbi "github.com/InterDigitalInc/AdvantEDGE/go-apps/meep-loc-serv/sbi"
	dkm "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-data-key-mgr"
	httpLog "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-http-logger"
	log "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-logger"
	met "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-metrics"
	redis "github.com/InterDigitalInc/AdvantEDGE/go-packages/meep-redis"

	"github.com/gorilla/mux"
)

const LocServBasePath = "/location/v2/"
const locServKey = "loc-serv:"
const logModuleLocServ = "meep-loc-serv"
const serviceName = "Location Service"

const typeZone = "zone"
const typeAccessPoint = "accessPoint"
const typeUser = "user"
const typeZonalSubscription = "zonalsubs"
const typeUserSubscription = "usersubs"
const typeZoneStatusSubscription = "zonestatus"

const (
	notifZonalPresence = "ZonalPresenceNotification"
	notifZoneStatus    = "ZoneStatusNotification"
)

type UeUserData struct {
	queryZoneId  []string
	queryApId    []string
	queryAddress []string
	userList     *UserList
}

type ApUserData struct {
	queryInterestRealm string
	apList             *AccessPointList
}

var nextZonalSubscriptionIdAvailable int
var nextUserSubscriptionIdAvailable int
var nextZoneStatusSubscriptionIdAvailable int

var zonalSubscriptionEnteringMap = map[int]string{}
var zonalSubscriptionLeavingMap = map[int]string{}
var zonalSubscriptionTransferringMap = map[int]string{}
var zonalSubscriptionMap = map[int]string{}

var userSubscriptionEnteringMap = map[int]string{}
var userSubscriptionLeavingMap = map[int]string{}
var userSubscriptionTransferringMap = map[int]string{}
var userSubscriptionMap = map[int]string{}

var zoneStatusSubscriptionMap = map[int]*ZoneStatusCheck{}

type ZoneStatusCheck struct {
	ZoneId                 string
	Serviceable            bool
	Unserviceable          bool
	Unknown                bool
	NbUsersInZoneThreshold int32
	NbUsersInAPThreshold   int32
}

var LOC_SERV_DB = 0
var currentStoreName = ""

var redisAddr string = "meep-redis-master.default.svc.cluster.local:6379"
var influxAddr string = "http://meep-influxdb.default.svc.cluster.local:8086"

var rc *redis.Connector
var hostUrl *url.URL
var sandboxName string
var basePath string
var baseKey string
var mutex sync.Mutex

func notImplemented(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
	w.WriteHeader(http.StatusNotImplemented)
}

// Init - Location Service initialization
func Init() (err error) {

	sandboxNameEnv := strings.TrimSpace(os.Getenv("MEEP_SANDBOX_NAME"))
	if sandboxNameEnv != "" {
		sandboxName = sandboxNameEnv
	}
	if sandboxName == "" {
		err = errors.New("MEEP_SANDBOX_NAME env variable not set")
		log.Error(err.Error())
		return err
	}
	log.Info("MEEP_SANDBOX_NAME: ", sandboxName)

	// hostUrl is the url of the node serving the resourceURL
	// Retrieve public url address where service is reachable, if not present, use Host URL environment variable
	hostUrl, err = url.Parse(strings.TrimSpace(os.Getenv("MEEP_PUBLIC_URL")))
	if err != nil || hostUrl == nil || hostUrl.String() == "" {
		hostUrl, err = url.Parse(strings.TrimSpace(os.Getenv("MEEP_HOST_URL")))
		if err != nil {
			hostUrl = new(url.URL)
		}
	}
	log.Info("resource URL: ", hostUrl)

	// Set base path
	basePath = "/" + sandboxName + LocServBasePath

	// Get base storage key
	baseKey = dkm.GetKeyRoot(sandboxName) + locServKey

	// Connect to Redis DB
	rc, err = redis.NewConnector(redisAddr, LOC_SERV_DB)
	if err != nil {
		log.Error("Failed connection to Redis DB. Error: ", err)
		return err
	}
	_ = rc.DBFlush(baseKey)
	log.Info("Connected to Redis DB, location service table")

	userTrackingReInit()
	zonalTrafficReInit()
	zoneStatusReInit()

	// Initialize SBI
	sbiCfg := sbi.SbiCfg{
		SandboxName:    sandboxName,
		RedisAddr:      redisAddr,
		UserInfoCb:     updateUserInfo,
		ZoneInfoCb:     updateZoneInfo,
		ApInfoCb:       updateAccessPointInfo,
		ScenarioNameCb: updateStoreName,
		CleanUpCb:      cleanUp,
	}
	err = sbi.Init(sbiCfg)
	if err != nil {
		log.Error("Failed initialize SBI. Error: ", err)
		return err
	}
	log.Info("SBI Initialized")

	return nil
}

// Run - Start Location Service
func Run() (err error) {
	return sbi.Run()
}

// Stop - Stop RNIS
func Stop() (err error) {
	return sbi.Stop()
}

func deregisterZoneStatus(subsIdStr string) {
	subsId, err := strconv.Atoi(subsIdStr)
	if err != nil {
		log.Error(err)
	}

	mutex.Lock()
	defer mutex.Unlock()
	zoneStatusSubscriptionMap[subsId] = nil
}

func registerZoneStatus(zoneId string, nbOfUsersZoneThreshold int32, nbOfUsersAPThreshold int32, opStatus []OperationStatus, subsIdStr string) {