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implement state management in redux
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@ -17,8 +17,10 @@
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* under the License.
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*/
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import { createContext, useEffect, useMemo, useRef, useState } from 'react';
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import { Action, Dispatch } from 'redux';
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import { makeApi } from '@superset-ui/core';
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import { useEffect, useMemo, useRef, useState } from 'react';
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import { useDispatch, useSelector } from 'react-redux';
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export enum ResourceStatus {
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LOADING = 'loading',
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@ -32,6 +34,10 @@ export enum ResourceStatus {
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*/
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export type Resource<T> = LoadingState | CompleteState<T> | ErrorState;
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export type ReduxState = {
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[url: string]: Resource<any>;
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};
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// Trying out something a little different: a separate type per status.
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// This should let Typescript know whether a Resource has a result or error.
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// It's possible that I'm expecting too much from Typescript here.
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@ -61,12 +67,87 @@ type ErrorState = {
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error: Error;
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};
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const initialState: LoadingState = {
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const loadingState: LoadingState = {
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status: ResourceStatus.LOADING,
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result: null,
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error: null,
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};
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const RESOURCE_FETCH_START = 'RESOURCE_FETCH_START';
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const RESOURCE_FETCH_COMPLETE = 'RESOURCE_FETCH_COMPLETE';
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const RESOURCE_FETCH_ERROR = 'RESROUCE_FETCH_ERROR';
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type FetchStart = {
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type: typeof RESOURCE_FETCH_START;
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endpoint: string;
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};
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type FetchComplete<T = any> = {
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type: typeof RESOURCE_FETCH_COMPLETE;
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endpoint: string;
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result: T;
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};
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type FetchError = {
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type: typeof RESOURCE_FETCH_ERROR;
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endpoint: string;
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error: Error;
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};
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type ResourceAction = FetchStart | FetchComplete | FetchError;
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export type ResourcesState = Record<string, Resource<any>>;
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export const initialResourcesState: ResourcesState = {};
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export function resourcesReducer(
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state: ResourcesState = initialResourcesState,
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action: ResourceAction,
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): ResourcesState {
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switch (action.type) {
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case RESOURCE_FETCH_START: {
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return {
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...state,
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[action.endpoint]: {
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status: ResourceStatus.LOADING,
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result: null,
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error: null,
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},
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};
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}
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case RESOURCE_FETCH_COMPLETE: {
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const { endpoint, result } = action;
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return {
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...state,
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[endpoint]: {
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status: ResourceStatus.COMPLETE,
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result,
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error: null,
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},
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};
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}
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case RESOURCE_FETCH_ERROR: {
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const { endpoint, error } = action as FetchError;
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return {
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...state,
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[endpoint]: {
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status: ResourceStatus.ERROR,
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result: null,
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error,
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},
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};
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}
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default:
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return state;
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}
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}
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type ReduxRootState = { apiResources: ResourcesState };
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const selectResourceForEndpoint = <RESULT>(endpoint: string) => (
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state: ReduxRootState,
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): Resource<RESULT> | null => state.apiResources[endpoint] ?? null;
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/**
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* A general-purpose hook to fetch the response from an endpoint.
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* Returns the full response body from the API, including metadata.
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@ -87,21 +168,19 @@ const initialState: LoadingState = {
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export function useApiResourceFullBody<RESULT>(
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endpoint: string,
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): Resource<RESULT> {
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const [resource, setResource] = useState<Resource<RESULT>>(initialState);
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const cancelRef = useRef<() => void>(() => {});
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const dispatch = useDispatch<Dispatch<ResourceAction>>();
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const resource = useSelector(selectResourceForEndpoint<RESULT>(endpoint));
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useEffect(() => {
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// If refresh is implemented, this will need to change.
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// The previous values should stay during refresh.
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setResource(initialState);
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if (resource != null) {
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// fetching already underway/complete, don't duplicate work.
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return;
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}
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// when this effect runs, the endpoint has changed.
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// cancel any current calls so that state doesn't get messed up.
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cancelRef.current();
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let cancelled = false;
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cancelRef.current = () => {
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cancelled = true;
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};
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dispatch({
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type: RESOURCE_FETCH_START,
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endpoint,
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});
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const fetchResource = makeApi<{}, RESULT>({
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method: 'GET',
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@ -110,31 +189,22 @@ export function useApiResourceFullBody<RESULT>(
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fetchResource({})
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.then(result => {
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if (!cancelled) {
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setResource({
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status: ResourceStatus.COMPLETE,
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result,
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error: null,
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});
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}
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dispatch({
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type: RESOURCE_FETCH_COMPLETE,
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endpoint,
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result,
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});
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})
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.catch(error => {
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if (!cancelled) {
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setResource({
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status: ResourceStatus.ERROR,
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result: null,
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error,
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});
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}
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dispatch({
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type: RESOURCE_FETCH_ERROR,
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endpoint,
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error,
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});
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});
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}, [endpoint, resource, dispatch]);
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// Cancel the request when the component un-mounts
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return () => {
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cancelled = true;
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};
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}, [endpoint]);
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return resource;
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return resource ?? loadingState;
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}
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/**
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@ -17,11 +17,7 @@
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* under the License.
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*/
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export {
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useApiResourceFullBody,
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useApiV1Resource,
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useTransformedResource,
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} from './apiResources';
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export * from './apiResources';
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// A central catalog of API Resource hooks.
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// Add new API hooks here, organized under
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@ -47,6 +47,7 @@ import getFilterConfigsFromFormdata from '../util/getFilterConfigsFromFormdata';
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import getLocationHash from '../util/getLocationHash';
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import newComponentFactory from '../util/newComponentFactory';
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import { TIME_RANGE } from '../../visualizations/FilterBox/FilterBox';
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import { initialResourcesState } from 'src/common/hooks/apiResources/apiResources';
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export default function getInitialState(bootstrapData) {
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const { user_id, datasources, common, editMode, urlParams } = bootstrapData;
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@ -308,5 +309,6 @@ export default function getInitialState(bootstrapData) {
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dashboardLayout,
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messageToasts: [],
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impressionId: shortid.generate(),
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apiResources: initialResourcesState,
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};
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}
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*/
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import { combineReducers } from 'redux';
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import { resourcesReducer } from 'src/common/hooks/apiResources';
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import charts from '../../chart/chartReducer';
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import dashboardInfo from './dashboardInfo';
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import dashboardState from './dashboardState';
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@ -41,4 +42,5 @@ export default combineReducers({
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impressionId,
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messageToasts,
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sliceEntities,
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apiResources: resourcesReducer,
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});
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