@reactivex/ix-es5-esm/asynciterable/operators/timeout.js

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from '../asynciterablex.js';
import { sleep } from '../_sleep.js';
import { wrapWithAbort } from './withabort.js';
import { throwIfAborted } from '../../aborterror.js';
import { isObject } from '../../util/isiterable.js';
import { safeRace } from '../../util/safeRace.js';
import { returnAsyncIterator } from '../../util/returniterator.js';
/** @ignore */
var TimeoutError = /** @class */ (function (_super) {
    __extends(TimeoutError, _super);
    function TimeoutError(message) {
        if (message === void 0) { message = 'Timeout has occurred'; }
        var _this = _super.call(this, message) || this;
        Object.setPrototypeOf(_this, TimeoutError.prototype);
        Error.captureStackTrace(_this, _this.constructor);
        _this.name = 'TimeoutError';
        return _this;
    }
    Object.defineProperty(TimeoutError.prototype, Symbol.toStringTag, {
        get: function () {
            return 'TimeoutError';
        },
        enumerable: false,
        configurable: true
    });
    return TimeoutError;
}(Error));
export { TimeoutError };
Object.defineProperty(TimeoutError, Symbol.hasInstance, {
    writable: true,
    configurable: true,
    value: function (x) {
        return (isObject(x) &&
            (x.constructor.name === 'TimeoutError' || x[Symbol.toStringTag] === 'TimeoutError'));
    },
});
var VALUE_TYPE = 'value';
var ERROR_TYPE = 'error';
/** @ignore */
var TimeoutAsyncIterable = /** @class */ (function (_super) {
    __extends(TimeoutAsyncIterable, _super);
    function TimeoutAsyncIterable(source, dueTime) {
        var _this = _super.call(this) || this;
        _this._source = source;
        _this._dueTime = dueTime;
        return _this;
    }
    TimeoutAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
        return __asyncGenerator(this, arguments, function _a() {
            var it, _b, type, value;
            return __generator(this, function (_c) {
                switch (_c.label) {
                    case 0:
                        throwIfAborted(signal);
                        it = wrapWithAbort(this._source, signal)[Symbol.asyncIterator]();
                        _c.label = 1;
                    case 1:
                        _c.trys.push([1, , 7, 9]);
                        _c.label = 2;
                    case 2:
                        if (!1) return [3 /*break*/, 6];
                        return [4 /*yield*/, __await(safeRace([
                                it.next().then(function (val) {
                                    return { type: VALUE_TYPE, value: val };
                                }),
                                sleep(this._dueTime, signal).then(function () {
                                    return { type: ERROR_TYPE };
                                }),
                            ]))];
                    case 3:
                        _b = _c.sent(), type = _b.type, value = _b.value;
                        if (type === ERROR_TYPE) {
                            throw new TimeoutError();
                        }
                        if (!value || value.done) {
                            return [3 /*break*/, 6];
                        }
                        return [4 /*yield*/, __await(value.value)];
                    case 4: return [4 /*yield*/, _c.sent()];
                    case 5:
                        _c.sent();
                        return [3 /*break*/, 2];
                    case 6: return [3 /*break*/, 9];
                    case 7: return [4 /*yield*/, __await(returnAsyncIterator(it))];
                    case 8:
                        _c.sent();
                        return [7 /*endfinally*/];
                    case 9: return [2 /*return*/];
                }
            });
        });
    };
    return TimeoutAsyncIterable;
}(AsyncIterableX));
export { TimeoutAsyncIterable };
/**
 * Applies a timeout policy for each element in the async-iterable sequence.
 * If the next element isn't received within the specified timeout duration starting from its predecessor, a TimeoutError is thrown.
 *
 * @template TSource The type of the elements in the source sequence.
 * @param {number} dueTime Maximum duration in milliseconds between values before a timeout occurs.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} The source sequence with a TimeoutError in case of a timeout.
 */
export function timeout(dueTime) {
    return function timeoutOperatorFunction(source) {
        return new TimeoutAsyncIterable(source, dueTime);
    };
}

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