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