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Текущая директория: /opt/BitGoJS/node_modules/@polkadot/api-derive/tx

Просмотр файла: signingInfo.js

import { catchError, combineLatest, map, of, switchMap } from 'rxjs';
import { isNumber, isUndefined } from '@polkadot/util';
import { unwrapBlockNumber } from '../util/index.js';
import { FALLBACK_MAX_HASH_COUNT, FALLBACK_PERIOD, MAX_FINALITY_LAG, MORTAL_PERIOD } from './constants.js';
function latestNonce(api, address) {
    return api.derive.balances.account(address).pipe(map(({ accountNonce }) => accountNonce));
}
function nextNonce(api, address) {
    if (api.call.accountNonceApi) {
        return api.call.accountNonceApi.accountNonce(address);
    }
    else {
        return api.rpc.system?.accountNextIndex
            ? api.rpc.system.accountNextIndex(address)
            : latestNonce(api, address);
    }
}
function signingHeader(api) {
    return combineLatest([
        api.rpc.chain.getHeader().pipe(switchMap((header) => 
        // check for chains at genesis (until block 1 is produced, e.g. 6s), since
        // we do need to allow transactions at chain start (also dev/seal chains)
        header.parentHash.isEmpty
            ? of(header)
            // in the case of the current block, we use the parent to minimize the
            // impact of forks on the system, but not completely remove it
            : api.rpc.chain.getHeader(header.parentHash).pipe(catchError(() => of(header))))),
        api.rpc.chain.getFinalizedHead().pipe(switchMap((hash) => api.rpc.chain.getHeader(hash).pipe(catchError(() => of(null)))))
    ]).pipe(map(([current, finalized]) => 
    // determine the hash to use, current when lag > max, else finalized
    !finalized || unwrapBlockNumber(current).sub(unwrapBlockNumber(finalized)).gt(MAX_FINALITY_LAG)
        ? current
        : finalized));
}
function babeOrAuraPeriod(api) {
    const period = api.consts.babe?.expectedBlockTime ||
        // this will be present ones https://github.com/paritytech/polkadot-sdk/pull/3732 is merged
        api.consts['aura']?.slotDuration ||
        api.consts.timestamp?.minimumPeriod.muln(2);
    return period && period.isZero && !period.isZero() ? period : undefined;
}
export function signingInfo(_instanceId, api) {
    // no memo, we want to do this fresh on each run
    return (address, nonce, era) => combineLatest([
        // retrieve nonce if none was specified
        isUndefined(nonce)
            ? latestNonce(api, address)
            : nonce === -1
                ? nextNonce(api, address)
                : of(api.registry.createType('Index', nonce)),
        // if no era (create) or era > 0 (mortal), do block retrieval
        (isUndefined(era) || (isNumber(era) && era > 0))
            ? signingHeader(api)
            : of(null)
    ]).pipe(map(([nonce, header]) => ({
        header,
        mortalLength: Math.min(api.consts.system?.blockHashCount?.toNumber() || FALLBACK_MAX_HASH_COUNT, MORTAL_PERIOD
            .div(babeOrAuraPeriod(api) || FALLBACK_PERIOD)
            .iadd(MAX_FINALITY_LAG)
            .toNumber()),
        nonce
    })));
}

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