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Viewing file:     pubsub-async-iterator.js (7.36 KB)      -rw-r--r--

"use strict";
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 __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.PubSubAsyncIterator = void 0;
var iterall_1 = require("iterall");
var PubSubAsyncIterator = (function () {
    function PubSubAsyncIterator(pubsub, eventNames) {
        this.pubsub = pubsub;
        this.pullQueue = [];
        this.pushQueue = [];
        this.running = true;
        this.allSubscribed = null;
        this.eventsArray = typeof eventNames === 'string' ? [eventNames] : eventNames;
    }
    PubSubAsyncIterator.prototype.next = function () {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!!this.allSubscribed) return [3, 2];
                        return [4, (this.allSubscribed = this.subscribeAll())];
                    case 1:
                        _a.sent();
                        _a.label = 2;
                    case 2: return [2, this.pullValue()];
                }
            });
        });
    };
    PubSubAsyncIterator.prototype.return = function () {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4, this.emptyQueue()];
                    case 1:
                        _a.sent();
                        return [2, { value: undefined, done: true }];
                }
            });
        });
    };
    PubSubAsyncIterator.prototype.throw = function (error) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4, this.emptyQueue()];
                    case 1:
                        _a.sent();
                        return [2, Promise.reject(error)];
                }
            });
        });
    };
    PubSubAsyncIterator.prototype[iterall_1.$$asyncIterator] = function () {
        return this;
    };
    PubSubAsyncIterator.prototype.pushValue = function (event) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4, this.allSubscribed];
                    case 1:
                        _a.sent();
                        if (this.pullQueue.length !== 0) {
                            this.pullQueue.shift()(this.running
                                ? { value: event, done: false }
                                : { value: undefined, done: true });
                        }
                        else {
                            this.pushQueue.push(event);
                        }
                        return [2];
                }
            });
        });
    };
    PubSubAsyncIterator.prototype.pullValue = function () {
        var _this = this;
        return new Promise(function (resolve) {
            if (_this.pushQueue.length !== 0) {
                resolve(_this.running
                    ? { value: _this.pushQueue.shift(), done: false }
                    : { value: undefined, done: true });
            }
            else {
                _this.pullQueue.push(resolve);
            }
        });
    };
    PubSubAsyncIterator.prototype.emptyQueue = function () {
        return __awaiter(this, void 0, void 0, function () {
            var subscriptionIds;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!this.running) return [3, 2];
                        this.running = false;
                        this.pullQueue.forEach(function (resolve) { return resolve({ value: undefined, done: true }); });
                        this.pullQueue.length = 0;
                        this.pushQueue.length = 0;
                        return [4, this.allSubscribed];
                    case 1:
                        subscriptionIds = _a.sent();
                        if (subscriptionIds) {
                            this.unsubscribeAll(subscriptionIds);
                        }
                        _a.label = 2;
                    case 2: return [2];
                }
            });
        });
    };
    PubSubAsyncIterator.prototype.subscribeAll = function () {
        var _this = this;
        return Promise.all(this.eventsArray.map(function (eventName) { return _this.pubsub.subscribe(eventName, _this.pushValue.bind(_this), {}); }));
    };
    PubSubAsyncIterator.prototype.unsubscribeAll = function (subscriptionIds) {
        for (var _i = 0, subscriptionIds_1 = subscriptionIds; _i < subscriptionIds_1.length; _i++) {
            var subscriptionId = subscriptionIds_1[_i];
            this.pubsub.unsubscribe(subscriptionId);
        }
    };
    return PubSubAsyncIterator;
}());
exports.PubSubAsyncIterator = PubSubAsyncIterator;
//# sourceMappingURL=pubsub-async-iterator.js.map