@kamilkisiela/graphql-tools/dist/stitching/observableToAsyncIterable.js

Useful tools to create and manipulate GraphQL schemas.

var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    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) : new P(function (resolve) { resolve(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 });
var iterall_1 = require("iterall");
function observableToAsyncIterable(observable) {
    var _a;
    var pullQueue = [];
    var pushQueue = [];
    var listening = true;
    var pushValue = function (_a) {
        var data = _a.data;
        if (pullQueue.length !== 0) {
            pullQueue.shift()({ value: data, done: false });
        }
        else {
            pushQueue.push({ value: data });
        }
    };
    var pushError = function (error) {
        if (pullQueue.length !== 0) {
            pullQueue.shift()({ value: { errors: [error] }, done: false });
        }
        else {
            pushQueue.push({ value: { errors: [error] } });
        }
    };
    var pullValue = function () {
        return new Promise(function (resolve) {
            if (pushQueue.length !== 0) {
                var element = pushQueue.shift();
                // either {value: {errors: [...]}} or {value: ...}
                resolve(__assign({}, element, { done: false }));
            }
            else {
                pullQueue.push(resolve);
            }
        });
    };
    var subscription = observable.subscribe({
        next: function (value) {
            pushValue(value);
        },
        error: function (err) {
            pushError(err);
        },
    });
    var emptyQueue = function () {
        if (listening) {
            listening = false;
            subscription.unsubscribe();
            pullQueue.forEach(function (resolve) { return resolve({ value: undefined, done: true }); });
            pullQueue.length = 0;
            pushQueue.length = 0;
        }
    };
    return _a = {
            next: function () {
                return __awaiter(this, void 0, void 0, function () {
                    return __generator(this, function (_a) {
                        return [2 /*return*/, listening ? pullValue() : this.return()];
                    });
                });
            },
            return: function () {
                emptyQueue();
                return Promise.resolve({ value: undefined, done: true });
            },
            throw: function (error) {
                emptyQueue();
                return Promise.reject(error);
            }
        },
        _a[iterall_1.$$asyncIterator] = function () {
            return this;
        },
        _a;
}
exports.observableToAsyncIterable = observableToAsyncIterable;
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