reactive-blocs/action-context.js

Reactive Blocs

"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());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createActionContext = void 0;
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const utils_1 = require("./utils");
const handleExecution = (action, handler) => __awaiter(void 0, void 0, void 0, function* () {
    const { id, args } = action;
    try {
        const result = yield handler(args);
        return { id, result };
    }
    catch (err) {
        return { id, result: err };
    }
});
const createActionOf = (actionStream, responseStream) => (type, handler) => {
    return actionStream
        .pipe((0, operators_1.filter)(action => action.type === type), (0, operators_1.mergeMap)(action => handleExecution(action, handler)))
        .subscribe(result => responseStream.next(result));
};
const createDispatch = (actionStream, responseStream) => (type, args) => {
    const action = {
        id: (0, utils_1.generateId)(),
        type, args
    };
    const res = responseStream.pipe((0, operators_1.filter)(r => r.id === action.id), (0, operators_1.map)(r => r.result), (0, operators_1.take)(1));
    actionStream.next(action);
    return res;
};
const createActionContext = () => {
    const actionStream = new rxjs_1.Subject();
    const responseStream = new rxjs_1.Subject();
    const dispatch = createDispatch(actionStream, responseStream);
    const actionOf = createActionOf(actionStream, responseStream);
    return { dispatch, actionOf };
};
exports.createActionContext = createActionContext;