98 lines
2.5 KiB
TypeScript
98 lines
2.5 KiB
TypeScript
/*
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This file is part of GNU Anastasis
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(C) 2021-2022 Anastasis SARL
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GNU Anastasis is free software; you can redistribute it and/or modify it under the
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terms of the GNU Affero General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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GNU Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License along with
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GNU Anastasis; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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*
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* @author Sebastian Javier Marchano (sebasjm)
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*/
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import { useCallback, useEffect, useRef, useState } from "preact/hooks";
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// import { cancelPendingRequest } from "./backend.js";
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export interface Options {
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slowTolerance: number;
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}
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export interface AsyncOperationApi<T> {
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request: (...a: any) => void;
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cancel: () => void;
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data: T | undefined;
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isSlow: boolean;
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isLoading: boolean;
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error: string | undefined;
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}
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export function useIsMounted() {
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const isMountedRef = useRef(true);
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const isMounted = useCallback(() => isMountedRef.current, []);
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useEffect(() => {
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return () => void (isMountedRef.current = false);
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}, []);
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return isMounted;
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}
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export function useAsync<T>(
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fn?: (...args: any) => Promise<T>,
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{ slowTolerance: tooLong }: Options = { slowTolerance: 1000 },
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): AsyncOperationApi<T> {
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const [data, setData] = useState<T | undefined>(undefined);
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const [isLoading, setLoading] = useState<boolean>(false);
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const [error, setError] = useState<any>(undefined);
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const [isSlow, setSlow] = useState(false);
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const isMounted = useIsMounted();
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const request = async (...args: any) => {
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if (!fn) return;
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setLoading(true);
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const handler = setTimeout(() => {
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if (!isMounted()) {
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return;
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}
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setSlow(true);
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}, tooLong);
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try {
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const result = await fn(...args);
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if (!isMounted()) {
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// Possibly calling fn(...) resulted in the component being unmounted.
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return;
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}
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setData(result);
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} catch (error) {
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setError(error);
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}
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setLoading(false);
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setSlow(false);
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clearTimeout(handler);
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};
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function cancel() {
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// cancelPendingRequest()
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setLoading(false);
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setSlow(false);
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}
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return {
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request,
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cancel,
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data,
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isSlow,
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isLoading,
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error,
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};
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}
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