@neurosity/sdk
Version:
Neurosity SDK
79 lines (78 loc) • 3.48 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Timesync = void 0;
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const operators_2 = require("rxjs/operators");
const outliers_1 = __importDefault(require("outliers"));
const whileOnline_1 = require("../utils/whileOnline");
const defaultOptions = {
bufferSize: 100,
updateInterval: 1 * 60 * 1000 // every minute
};
class Timesync {
constructor(options) {
this._offset = 0;
this.options = Object.assign(Object.assign({}, defaultOptions), options);
this.start();
}
start() {
const { bufferSize, updateInterval, status$ } = this.options;
const burst$ = (0, rxjs_1.range)(0, bufferSize);
const timer$ = (0, rxjs_1.timer)(updateInterval, updateInterval).pipe((0, operators_1.map)((i) => bufferSize + i), (0, whileOnline_1.whileOnline)({
status$,
allowWhileOnSleepMode: true
}));
const firstTimeDeviceIsOnline$ = status$.pipe((0, operators_1.filter)((status) => status.state === "online"), (0, operators_1.take)(1));
firstTimeDeviceIsOnline$
.pipe((0, operators_2.switchMap)(() => {
return burst$.pipe((0, operators_1.concatWith)(timer$), this.toOffset(), (0, operators_2.bufferCount)(bufferSize, 1), this.filterOutliers(), (0, operators_1.map)((list) => this.average(list)));
}))
.subscribe((offset) => {
this._offset = offset;
});
}
filterOutliers() {
return (0, rxjs_1.pipe)((0, operators_1.map)((offsets) => {
return offsets.filter((0, outliers_1.default)());
}));
}
toOffset() {
const { getTimesync } = this.options;
return (0, rxjs_1.pipe)((0, operators_2.concatMap)(() => __awaiter(this, void 0, void 0, function* () {
const requestStartTime = Date.now();
const [error, serverTime] = yield getTimesync()
.then((offset) => [null, offset])
.catch((error) => [error]);
if (error) {
return 0;
}
const responseEndTime = Date.now();
const oneWayDuration = (responseEndTime - requestStartTime) / 2;
const offset = responseEndTime - oneWayDuration - serverTime;
return offset;
})));
}
average(list) {
return Math.round(list.reduce((acc, number) => acc + number) / list.length);
}
get offset() {
return this._offset;
}
get timestamp() {
return Date.now() + this._offset;
}
}
exports.Timesync = Timesync;