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https://git.rezel.net/LudoTech/traque.git
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refactoed backend code to split team and admin messagin logic
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186
traque-back/zone_manager.js
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186
traque-back/zone_manager.js
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import randomLocation, { randomCirclePoint } from 'random-location'
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import { getDistanceFromLatLon, isInCircle } from './map_utils.js';
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import { map } from './util.js';
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export class ZoneManager {
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constructor(onZoneUpdate, onNextZoneUpdate) {
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//Setings storing where the zone will start, end and how it should evolve
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//The zone will start by staying at its mzx value for reductionInterval minutes
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//and then reduce during reductionDuration minutes, then wait again...
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//The reduction factor is such that after reductionCount the zone will be the min zone
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//a call to onZoneUpdate will be made every updateIntervalSeconds when the zone is changing
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//a call to onNextZoneUpdate will be made when the zone reduction ends and a new next zone is announced
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this.zoneSettings = {
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min: { center: null, radius: null },
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max: { center: null, radius: null },
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reductionCount: 2,
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reductionDuration: 1,
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reductionInterval: 1,
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updateIntervalSeconds: 1,
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}
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this.shrinkFactor = null;
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//Live location of the zone
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this.currentZone = { center: null, radius: null };
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//If the zone is shrinking, this is the target of the current shrinking
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//If the zone is not shrinking, this will be the target of the next shrinking
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this.nextZone = { center: null, radius: null };
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//Zone at the begining of the shrinking
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this.currentStartZone = { center: null, radius: null };
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this.startDate = null;
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this.started = false;
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this.updateIntervalId = null;
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this.nextZoneTimeoutId = null;
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this.onZoneUpdate = onZoneUpdate;
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this.onNextZoneUpdate = onNextZoneUpdate
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}
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/**
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* Test if a given configuration object is valid, i.e if all needed values are well defined
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* @param {Object} settings Settings object describing a config of a zone manager
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* @returns if the config is correct
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*/
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validateSettings(settings) {
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if (settings.reductionCount && (typeof settings.reductionCount != "number" || settings.reductionCount <= 0)) { return false }
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if (settings.reductionDuration && (typeof settings.reductionDuration != "number" || settings.reductionDuration < 0)) { return false }
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if (settings.reductionInterval && (typeof settings.reductionInterval != "number" || settings.reductionInterval < 0)) { return false }
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if (settings.updateIntervalSeconds && (typeof settings.updateIntervalSeconds != "number" || settings.updateIntervalSeconds <= 0)) { return false }
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if (settings.max && (typeof settings.max.radius != "number" || typeof settings.max.center.lat != "number" || typeof settings.max.center.lng != "number")) { return false }
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if (settings.min && (typeof settings.min.radius != "number" || typeof settings.min.center.lat != "number" || typeof settings.min.center.lng != "number")) { return false }
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return true;
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}
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/**
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* Test if the zone manager is ready to start
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* @returns true if the zone manager is ready to be started, false otherwise
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*/
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ready() {
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return this.validateSettings(this.zoneSettings);
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}
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/**
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* Update the settings of the zone, this can be done by passing an object containing the settings to change.
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* Unless specified, the durations are in minutes
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* Default config :
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* `this.zoneSettings = {
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* min: {center: null, radius: null},
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* max: {center: null, radius: null},
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* reductionCount: 2,
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* reductionDuration: 10,
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* reductionInterval: 10,
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* updateIntervalSeconds: 10,
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* }`
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* @param {Object} newSettings The fields of the settings to udpate
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* @returns
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*/
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udpateSettings(newSettings) {
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//validate settings
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this.zoneSettings = { ...this.zoneSettings, ...newSettings };
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this.shrinkFactor = Math.pow(this.zoneSettings.min.radius / this.zoneSettings.max.radius, 1 / this.zoneSettings.reductionCount)
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return true;
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}
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/**
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* Reinitialize the object and stop all the tasks
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*/
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reset() {
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this.currentZoneCount = 0;
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this.started = false;
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if (this.updateIntervalId != null) {
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clearInterval(this.updateIntervalId);
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this.updateIntervalId = null;
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}
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if (this.nextZoneTimeoutId != null) {
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clearTimeout(this.nextZoneTimeoutId);
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this.nextZoneTimeoutId = null;
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}
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}
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/**
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* Start the zone reduction sequence
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*/
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start() {
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this.started = true;
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this.startDate = new Date();
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//initialize the zone to its max value
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this.nextZone = JSON.parse(JSON.stringify(this.zoneSettings.max));
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this.currentStartZone = JSON.parse(JSON.stringify(this.zoneSettings.max));
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this.currentZone = JSON.parse(JSON.stringify(this.zoneSettings.max));
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this.setNextZone();
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}
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/**
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* Get the center of the next zone, this center need to satisfy two properties
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* - it needs to be included in the current zone, this means that this new point should lie in the circle of center currentZone.center and radius currentZone.radius - newRadius
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* - it needs to include the last zone, which means that the center must lie in the center of center min.center and of radius newRadius - min.radius
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* @param newRadius the radius that the new zone will have
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* @returns the coordinates of the new center as an object with lat and long fields
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*/
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getRandomNextCenter(newRadius) {
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let ok = false;
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let res = null
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//take a random point satisfying both conditions
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while (!ok) {
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res = randomCirclePoint({ latitude: this.currentZone.center.lat, longitude: this.currentZone.center.lng }, this.currentZone.radius - newRadius);
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ok = (isInCircle({ lat: res.latitude, lng: res.longitude }, this.zoneSettings.min.center, newRadius - this.zoneSettings.min.radius))
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}
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return {
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lat: res.latitude,
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lng: res.longitude
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}
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}
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/**
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* Compute the next zone satifying the given settings, update the nextZone and currentStartZone
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* Wait for the appropriate duration before starting a new zone reduction if needed
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*/
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setNextZone() {
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//At this point, nextZone == currentZone, we need to update the next zone, the raidus decrement, and start a timer before the next shrink
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//last zone
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if (this.currentZoneCount == this.zoneSettings.reductionCount) {
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this.nextZone = JSON.parse(JSON.stringify(this.zoneSettings.min))
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this.currentStartZone = JSON.parse(JSON.stringify(this.zoneSettings.min))
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} else if (this.currentZoneCount == this.zoneSettings.reductionCount - 1) {
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this.currentStartZone = JSON.parse(JSON.stringify(this.currentZone))
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this.nextZone = JSON.parse(JSON.stringify(this.zoneSettings.min))
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this.nextZoneTimeoutId = setTimeout(() => this.startShrinking(), 1000 * 60 * this.zoneSettings.reductionInterval)
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this.currentZoneCount++;
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} else if (this.currentZoneCount < this.zoneSettings.reductionCount) {
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this.nextZone.center = this.getRandomNextCenter(this.nextZone.radius * this.shrinkFactor)
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this.nextZone.radius *= this.shrinkFactor;
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this.currentStartZone = JSON.parse(JSON.stringify(this.currentZone))
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this.nextZoneTimeoutId = setTimeout(() => this.startShrinking(), 1000 * 60 * this.zoneSettings.reductionInterval)
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this.currentZoneCount++;
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}
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this.onNextZoneUpdate({
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begin: JSON.parse(JSON.stringify(this.currentStartZone)),
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end: JSON.parse(JSON.stringify(this.nextZone))
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})
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}
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/*
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* Start a task that will run periodically updatinng the zone size, and calling the onZoneUpdate callback
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* This will also periodically check if the reduction is over or not
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* If the reduction is over this function will call setNextZone
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*/
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startShrinking() {
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const startTime = new Date();
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this.updateIntervalId = setInterval(() => {
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const completed = ((new Date() - startTime) / (1000 * 60)) / this.zoneSettings.reductionDuration;
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this.currentZone.radius = map(completed, 0, 1, this.currentStartZone.radius, this.nextZone.radius)
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this.currentZone.center.lat = map(completed,0,1, this.currentStartZone.center.lat, this.nextZone.center.lat)
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this.currentZone.center.lng = map(completed,0,1, this.currentStartZone.center.lng, this.nextZone.center.lng)
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this.onZoneUpdate(JSON.parse(JSON.stringify(this.currentZone)))
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//Zone shrinking is over
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if (completed >= 1) {
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clearInterval(this.updateIntervalId);
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this.updateIntervalId = null;
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this.setNextZone();
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return;
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}
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}, this.zoneSettings.updateIntervalSeconds * 1000);
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}
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}
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