@nteract/epics/lib/execute/lazy-launch.js

Redux-Observable epics for nteract apps

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
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    o["default"] = v;
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var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
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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);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.lazyLaunchKernelEpic = exports.executeCellAfterKernelLaunchEpic = void 0;
const redux_observable_1 = require("redux-observable");
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const actions = __importStar(require("@nteract/actions"));
const selectors = __importStar(require("@nteract/selectors"));
const types_1 = require("@nteract/types");
const kernel_lifecycle_1 = require("../kernel-lifecycle");
/**
 * Executes all requests in the message queue then clears the queue after
 * the kernel is launched successfully and is ready to execute.
 */
exports.executeCellAfterKernelLaunchEpic = (action$, state$) => action$.pipe(redux_observable_1.ofType(actions.LAUNCH_KERNEL_SUCCESSFUL), operators_1.withLatestFrom(state$), operators_1.filter(([action, state]) => {
    if (selectors.messageQueue(state).size === 0) {
        return false;
    }
    const contentRef = action.payload.contentRef;
    const kernel = selectors.kernelByContentRef(state, { contentRef });
    return !!(kernel &&
        kernel.channels &&
        kernel.status !== types_1.KernelStatus.NotConnected &&
        kernel.status !== types_1.KernelStatus.ShuttingDown);
}), operators_1.switchMap(([_action, state]) => rxjs_1.merge(rxjs_1.of(...selectors
    .messageQueue(state)
    .map((queuedAction) => actions.executeCell(queuedAction.payload))), rxjs_1.of(actions.clearMessageQueue()))));
/**
 * Launches the kernel when user tries to execute a cell.
 * The distinct operator prevents the LaunchKernelByName action from
 * being emitted more than once within the same notebook.
 */
function lazyLaunchKernelEpic(action$, state$) {
    return action$.pipe(redux_observable_1.ofType(actions.EXECUTE_CELL), operators_1.filter((action) => {
        const state = state$.value;
        const contentRef = action.payload.contentRef;
        return !selectors.kernelByContentRef(state, { contentRef });
    }), operators_1.switchMap(action => {
        const state = state$.value;
        const contentRef = action.payload.contentRef;
        if (!contentRef) {
            return rxjs_1.of(actions.launchKernelFailed({
                error: new Error("Launch kernel did not receive a ContentRef."),
                code: types_1.errors.LAUNCH_NO_CONTENT_REF,
                contentRef
            }));
        }
        const content = selectors.content(state, { contentRef });
        const kernelRef = selectors.kernelRefByContentRef(state, {
            contentRef
        });
        if (!kernelRef ||
            !content ||
            content.type !== "notebook" ||
            content.model.type !== "notebook") {
            return rxjs_1.of(actions.launchKernelFailed({
                error: new Error("Launch kernel failed because the source content is not a notebook"),
                code: types_1.errors.LAUNCH_NOT_A_NOTEBOOK
            }));
        }
        const filepath = content.filepath;
        const notebook = content.model.notebook;
        const { cwd, kernelSpecName } = kernel_lifecycle_1.extractNewKernel(filepath, notebook);
        return rxjs_1.of(actions.launchKernelByName({
            kernelSpecName,
            cwd,
            kernelRef,
            selectNextKernel: true,
            contentRef
        }));
    }), operators_1.distinct((action) => action.payload.contentRef));
}
exports.lazyLaunchKernelEpic = lazyLaunchKernelEpic;
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