@nteract/epics/lib/comm.js

Redux-Observable epics for nteract apps

"use strict";
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    if (k2 === undefined) k2 = k;
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    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
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Object.defineProperty(exports, "__esModule", { value: true });
exports.commListenEpic = void 0;
const messaging_1 = require("@nteract/messaging");
const redux_observable_1 = require("redux-observable");
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const actions_1 = require("@nteract/actions");
const selectors = __importStar(require("@nteract/selectors"));
const types_1 = require("@nteract/types");
const ipywidgets_1 = require("./ipywidgets");
/**
 * An epic that emits comm actions from the backend kernel
 * @param  {Observable} action$ Action Observable from redux-observable
 * @param  {redux.Store} store   the redux store
 * @return {Observable}         Comm actions
 */
exports.commListenEpic = (action$, state$) => action$.pipe(
// A LAUNCH_KERNEL_SUCCESSFUL action indicates we have a new channel
redux_observable_1.ofType(actions_1.LAUNCH_KERNEL_SUCCESSFUL), operators_1.switchMap((action) => {
    const { payload: { kernel, contentRef } } = action;
    /**
     * We need the model of the currently loaded notebook so we can
     * determine what notebook to render the output of the widget onto.
     */
    const model = selectors.model(state$.value, { contentRef });
    const kernelRef = selectors.kernelRefByContentRef(state$.value, {
        contentRef
    });
    // Listen on the comms channel until KILL_KERNEL_SUCCESSFUL is emitted
    const commOpenAction$ = kernel.channels.pipe(messaging_1.ofMessageType("comm_open"), operators_1.map(actions_1.commOpenAction), operators_1.takeUntil(action$.pipe(redux_observable_1.ofType(actions_1.KILL_KERNEL_SUCCESSFUL), operators_1.filter((action) => action.payload.kernelRef === kernelRef))), operators_1.catchError((error) => {
        return rxjs_1.of(actions_1.executeFailed({
            error: new Error("The WebSocket connection has unexpectedly disconnected."),
            code: types_1.errors.EXEC_WEBSOCKET_ERROR,
            contentRef
        }));
    }));
    const commMessageAction$ = kernel.channels.pipe(messaging_1.ofMessageType("comm_msg"), operators_1.map(actions_1.commMessageAction), operators_1.takeUntil(action$.pipe(redux_observable_1.ofType(actions_1.KILL_KERNEL_SUCCESSFUL), operators_1.filter((action) => action.payload.kernelRef === kernelRef))), operators_1.catchError((error) => {
        return rxjs_1.of(actions_1.executeFailed({
            error: new Error("The WebSocket connection has unexpectedly disconnected."),
            code: types_1.errors.EXEC_WEBSOCKET_ERROR,
            contentRef
        }));
    }));
    return rxjs_1.merge(ipywidgets_1.ipywidgetsModel$(kernel, model, contentRef), commOpenAction$, commMessageAction$);
}));
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