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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/>. */
import { executeSoon } from "../../../utils/DevToolsUtils";
import { pending, rejected, fulfilled } from "../../../utils/async-value";
export function asyncActionAsValue(action) {
if (action.status === "start") {
return pending();
}
if (action.status === "error") {
return rejected(action.error);
}
return fulfilled(action.value);
}
let seqIdVal = 1;
function seqIdGen() {
return seqIdVal++;
}
function promiseMiddleware({ dispatch, getState }) {
return next => action => {
if (!(PROMISE in action)) {
return next(action);
}
const seqId = seqIdGen().toString();
const { [PROMISE]: promiseInst, ...originalActionProperties } = action;
// Create a new action that doesn't have the promise field and has
// the `seqId` field that represents the sequence id
action = { ...originalActionProperties, seqId };
dispatch({ ...action, status: "start" });
// Return the promise so action creators can still compose if they
// want to.
return Promise.resolve(promiseInst)
.finally(() => new Promise(resolve => executeSoon(resolve)))
.then(
value => {
dispatch({ ...action, status: "done", value: value });
return value;
},
error => {
dispatch({
...action,
status: "error",
error: error.message || error,
});
return Promise.reject(error);
}
);
};
}
export const PROMISE = "@@dispatch/promise";
export { promiseMiddleware as promise };
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