cyclon.p2p-rtc-comms/lib/SignallingServerBootstrap.js

"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var url_1 = __importDefault(require("url"));
var cyclon_p2p_common_1 = require("cyclon.p2p-common");
var PromiseTools_1 = require("./PromiseTools");
var API_PATH = './api/peers';
var SignallingServerBootstrap = /** @class */ (function () {
    function SignallingServerBootstrap(signallingSocket, httpRequestService, roomsToBootstrapFrom) {
        this.signallingSocket = signallingSocket;
        this.httpRequestService = httpRequestService;
        this.roomsToBootstrapFrom = roomsToBootstrapFrom;
        if (!(roomsToBootstrapFrom && roomsToBootstrapFrom.length > 0)) {
            throw new Error('Must specify at least one room to bootstrap from');
        }
    }
    /**
     * Fetch a list of registered peers from the server
     */
    SignallingServerBootstrap.prototype.getInitialPeerSet = function (cyclonNode, limit) {
        var _this = this;
        var serverSpecs = this.signallingSocket.getCurrentServerSpecs();
        if (serverSpecs.length > 0) {
            var roomToSampleFrom_1 = this.roomsToBootstrapFrom[Math.floor(Math.random() * this.roomsToBootstrapFrom.length)];
            var specPromises = serverSpecs.map(function (serverSpec) {
                return _this.getInitialPeerSetFromServer(cyclonNode, serverSpec, limit, roomToSampleFrom_1);
            });
            return PromiseTools_1.allSettled(specPromises).then(function (results) {
                var allResults = SignallingServerBootstrap.collateSuccessfulResults(results);
                return cyclon_p2p_common_1.randomSample(SignallingServerBootstrap.deDuplicatePeerList(allResults), limit);
            });
        }
        return Promise.reject(new Error('Not connected to any signalling servers, can\'t bootstrap'));
    };
    SignallingServerBootstrap.collateSuccessfulResults = function (arrayOfPromises) {
        return arrayOfPromises.reduce(function (current, next) {
            // @ts-ignore
            if (next.status === 'fulfilled') {
                return current.concat(next.value);
            }
            else {
                return current;
            }
        }, []);
    };
    SignallingServerBootstrap.deDuplicatePeerList = function (arrayOfPeers) {
        var peerMap = {};
        arrayOfPeers.forEach(function (peer) {
            if (peerMap.hasOwnProperty(peer.id)) {
                if (peerMap[peer.id].seq < peer.seq) {
                    peerMap[peer.id] = peer;
                }
            }
            else {
                peerMap[peer.id] = peer;
            }
        });
        var uniquePeers = [];
        for (var nodeId in peerMap) {
            uniquePeers.push(peerMap[nodeId]);
        }
        return uniquePeers;
    };
    SignallingServerBootstrap.prototype.getInitialPeerSetFromServer = function (cyclonNode, serverSpec, limit, roomToSampleFrom) {
        return __awaiter(this, void 0, void 0, function () {
            var response;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this.httpRequestService.get(SignallingServerBootstrap.generateUrl(serverSpec.signallingApiBase, limit, roomToSampleFrom))];
                    case 1:
                        response = _a.sent();
                        return [2 /*return*/, Object.keys(response).filter(function (peerId) {
                                return peerId !== cyclonNode.getId();
                            }).map(function (peerId) {
                                return response[peerId];
                            })];
                }
            });
        });
    };
    SignallingServerBootstrap.generateUrl = function (apiBase, limit, room) {
        //noinspection JSCheckFunctionSignatures
        return url_1.default.resolve(apiBase, API_PATH) + ("?room=" + room + "&limit=" + limit + "&nocache=" + new Date().getTime());
    };
    return SignallingServerBootstrap;
}());
exports.SignallingServerBootstrap = SignallingServerBootstrap;
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