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| const initialState = { | |
| resourceByHash: {}, | |
| isLoadingByHash: {}, | |
| errorByHash: {}, | |
| }; | |
| const reducer = (state = initialState, action) => { | |
| switch (action.type) { | |
| case 'START': { | |
| const { hash } = action.payload; | |
| return { | |
| ...state, | |
| isLoadingByHash: { | |
| ...state.isLoadingByHash, | |
| [hash]: true, | |
| }, | |
| }; | |
| } | |
| case 'DATA': { | |
| const { hash, data, finished } = action.payload; | |
| return { | |
| ...state, | |
| resourceByHash: { | |
| ...state.resourceByHash, | |
| [hash]: data, | |
| }, | |
| isLoadingByHash: { | |
| ...state.isLoadingByHash, | |
| [hash]: !finished, | |
| }, | |
| }; | |
| } | |
| case 'ERROR': { | |
| const { hash, error } = action.payload; | |
| return { | |
| ...state, | |
| errorByHash: { | |
| ...state.errorByHash, | |
| [hash]: error, | |
| }, | |
| isLoadingByHash: { | |
| ...state.isLoadingByHash, | |
| [hash]: false, | |
| }, | |
| }; | |
| } | |
| default: { | |
| return state; | |
| } | |
| } | |
| }; | |
| const loadAction = params => ({ | |
| type: 'LOAD', | |
| payload: { | |
| params, | |
| }, | |
| }); | |
| const startAction = hash => ({ | |
| type: 'START', | |
| payload: { | |
| hash, | |
| }, | |
| }); | |
| const dataAction = (hash, data) => ({ | |
| type: 'DATA', | |
| payload: { | |
| hash, | |
| data, | |
| }, | |
| }); | |
| const errorAction = (hash, error) => ({ | |
| type: 'ERROR', | |
| payload: { | |
| hash, | |
| error, | |
| }, | |
| }); | |
| const defaultCreateHash = params => JSON.stringify(params); | |
| const createUseResource = (epic, createHash = defaultCreateHash) => { | |
| const store = createEpicStore(reducer, initialState, epic); | |
| return params => { | |
| const hash = createHash(params); | |
| const selector = state => ({ | |
| resource: state.resourceByHash[hash], | |
| isLoading: state.isLoadingByHash[hash], | |
| error: state.errorByHash[hash], | |
| }); | |
| const { resource, isLoading, error } = useStore(store, selector); | |
| const load = store.dispatch(loadAction(hash)); | |
| return [load, resource, isLoading, error]; | |
| }; | |
| }; | |
| const useInfoResource = createUseResource((action, state) => | |
| action.pipe( | |
| ofType('LOAD'), | |
| map(action => [action, createHash(action.payload.params)]), | |
| filter(([action, hash]) => { | |
| const resource = state.value.resourceByHash[hash]; | |
| const isLoading = state.value.resourceByHash[hash]; | |
| return !resource && !isLoading; | |
| }), | |
| mergeMap(([action, hash]) => { | |
| const { params } = action.payload; | |
| const { itemId, varnish } = params; | |
| const requestParams = { | |
| path: `${itemId}/info.json`, | |
| varnish, | |
| }; | |
| return merge( | |
| of(startAction(hash)), | |
| createRequest({ params }).pipe( | |
| map(response => dataAction(hash, response)), | |
| catchError(error => errorAction(hash, error)), | |
| ), | |
| ); | |
| }), | |
| ), | |
| ); | |
| const Component = props => { | |
| const { type, itemId, loggedIn } = props; | |
| const [loadInfo, info, isLoadingInfo] = useInfoResource({ | |
| itemId, | |
| cache: !loggedIn, | |
| }); | |
| if (type === 'info' && !info && !isLoadingInfo) { | |
| loadInfo(); | |
| } | |
| }; |
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