50 lines
1.6 KiB
TypeScript
50 lines
1.6 KiB
TypeScript
// Copyright 2017-2022 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { ApiPromise } from '@polkadot/api';
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import { useMemo } from 'react';
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import { BN, BN_THOUSAND, BN_TWO, bnMin } from '@polkadot/util';
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import { createNamedHook } from './createNamedHook';
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import { useApi } from './useApi';
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import { A_DAY } from './useBlocksPerDays';
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// Some chains incorrectly use these, i.e. it is set to values such as 0 or even 2
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// Use a low minimum validity threshold to check these against
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const THRESHOLD = BN_THOUSAND.div(BN_TWO);
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const DEFAULT_TIME = new BN(6_000);
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function calcInterval (api: ApiPromise): BN {
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return bnMin(A_DAY, (
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// Babe, e.g. Relay chains (Substrate defaults)
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api.consts.babe?.expectedBlockTime ||
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// POW, eg. Kulupu
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api.consts.difficulty?.targetBlockTime ||
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// Subspace
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api.consts.subspace?.expectedBlockTime || (
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// Check against threshold to determine value validity
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api.consts.timestamp?.minimumPeriod.gte(THRESHOLD)
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// Default minimum period config
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? api.consts.timestamp.minimumPeriod.mul(BN_TWO)
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: api.query.parachainSystem
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// default guess for a parachain
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? DEFAULT_TIME.mul(BN_TWO)
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// default guess for others
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: DEFAULT_TIME
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)
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));
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}
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function useBlockIntervalImpl (apiOverride?: ApiPromise | null): BN {
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const { api } = useApi();
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return useMemo(
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() => calcInterval(apiOverride || api),
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[api, apiOverride]
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);
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}
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export const useBlockInterval = createNamedHook('useBlockInterval', useBlockIntervalImpl);
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