53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const uuidgen = require("sdk/util/uuid").uuid;
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const {
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entries, toObject, reportException, executeSoon
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} = require("devtools/shared/DevToolsUtils");
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const PROMISE = exports.PROMISE = "@@dispatch/promise";
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function promiseMiddleware ({ dispatch, getState }) {
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return next => action => {
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if (!(PROMISE in action)) {
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return next(action);
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}
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const promise = action[PROMISE];
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const seqId = uuidgen().toString();
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// Create a new action that doesn't have the promise field and has
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// the `seqId` field that represents the sequence id
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action = Object.assign(
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toObject(entries(action).filter(pair => pair[0] !== PROMISE)), { seqId }
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);
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dispatch(Object.assign({}, action, { status: "start" }));
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promise.then(value => {
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executeSoon(() => {
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dispatch(Object.assign({}, action, {
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status: "done",
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value: value
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}));
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});
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}).catch(error => {
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executeSoon(() => {
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dispatch(Object.assign({}, action, {
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status: "error",
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error
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}));
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});
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reportException(`@@redux/middleware/promise#${action.type}`, error);
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});
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// Return the promise so action creators can still compose if they
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// want to.
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return promise;
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};
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}
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exports.promise = promiseMiddleware;
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