@polkadot/types/generic/ConsensusEngineId.js

Implementation of the Parity codec

import { U8aFixed } from '@polkadot/types-codec';
import { BN, bnToU8a, isNumber, stringToU8a, u8aToHex, u8aToString } from '@polkadot/util';
export const CID_AURA = /*#__PURE__*/ stringToU8a('aura');
export const CID_BABE = /*#__PURE__*/ stringToU8a('BABE');
export const CID_GRPA = /*#__PURE__*/ stringToU8a('FRNK');
export const CID_POW = /*#__PURE__*/ stringToU8a('pow_');
export const CID_NMBS = /*#__PURE__*/ stringToU8a('nmbs');
function getAuraAuthor(registry, bytes, sessionValidators) {
    return sessionValidators[registry.createTypeUnsafe('RawAuraPreDigest', [bytes.toU8a(true)])
        .slotNumber
        .mod(new BN(sessionValidators.length))
        .toNumber()];
}
function getBabeAuthor(registry, bytes, sessionValidators) {
    const digest = registry.createTypeUnsafe('RawBabePreDigestCompat', [bytes.toU8a(true)]);
    return sessionValidators[digest.value.toNumber()];
}
function getBytesAsAuthor(registry, bytes) {
    return registry.createTypeUnsafe('AccountId', [bytes]);
}
/**
 * @name GenericConsensusEngineId
 * @description
 * A 4-byte identifier identifying the engine
 */
export class GenericConsensusEngineId extends U8aFixed {
    constructor(registry, value) {
        super(registry, isNumber(value)
            ? bnToU8a(value, { isLe: false })
            : value, 32);
    }
    /**
     * @description `true` if the engine matches aura
     */
    get isAura() {
        return this.eq(CID_AURA);
    }
    /**
     * @description `true` is the engine matches babe
     */
    get isBabe() {
        return this.eq(CID_BABE);
    }
    /**
     * @description `true` is the engine matches grandpa
     */
    get isGrandpa() {
        return this.eq(CID_GRPA);
    }
    /**
     * @description `true` is the engine matches pow
     */
    get isPow() {
        return this.eq(CID_POW);
    }
    /**
     * @description `true` is the engine matches nimbus
     */
    get isNimbus() {
        return this.eq(CID_NMBS);
    }
    /**
     * @description From the input bytes, decode into an author
     */
    extractAuthor(bytes, sessionValidators) {
        if (sessionValidators?.length) {
            if (this.isAura) {
                return getAuraAuthor(this.registry, bytes, sessionValidators);
            }
            else if (this.isBabe) {
                return getBabeAuthor(this.registry, bytes, sessionValidators);
            }
        }
        // For pow & Nimbus, the bytes are the actual author
        if (this.isPow || this.isNimbus) {
            return getBytesAsAuthor(this.registry, bytes);
        }
        return undefined;
    }
    /**
     * @description Converts the Object to to a human-friendly JSON, with additional fields, expansion and formatting of information
     */
    toHuman() {
        return this.toString();
    }
    /**
     * @description Returns the base runtime type name for this instance
     */
    toRawType() {
        return 'ConsensusEngineId';
    }
    /**
     * @description Override the default toString to return a 4-byte string
     */
    toString() {
        return this.isAscii
            ? u8aToString(this)
            : u8aToHex(this);
    }
}