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