@arturwojnar/hermes-postgresql/lib/common/lsn.js

Production-Ready TypeScript Outbox Pattern for PostgreSQL

const LSN_REGEXP = new RegExp(`^[0-9a-f]+/[0-9a-f]+$`, 'i');
const getUpperAndLowerWAL = (lsn) => {
    return lsn.split('/').map((x) => parseInt(x, 16));
};
const convertLsnToBigInt = (lsn) => {
    const [upperWal, lowerWal] = getUpperAndLowerWAL(lsn);
    return (BigInt(upperWal) << 32n) | BigInt(lowerWal);
};
const convertLsnToBuffer = (lsn) => {
    const buffer = Buffer.alloc(8);
    const value = convertLsnToBigInt(lsn);
    buffer.writeBigUInt64BE(value);
    return buffer;
};
const convertBigIntToLsn = (lsn) => {
    const upperWal = lsn >> 32n;
    const lowerWal = lsn & 0xffffffffn;
    return `${upperWal.toString(16).toUpperCase()}/${lowerWal.toString(16).toUpperCase()}`;
};
const incrementWAL = (lsn) => {
    return convertLsnToBigInt(lsn) + BigInt(1);
};
const constructLsn = (lsn) => {
    const upperWal = lsn.readUInt32BE(0).toString(16).toUpperCase();
    const lowerWal = lsn.readUInt32BE(4).toString(16).toUpperCase();
    return `${upperWal}/${lowerWal}`;
};
const isLsn = (value) => LSN_REGEXP.test(value);
const toLsn = (value) => {
    if (isLsn(value)) {
        return value;
    }
    throw new Error(`not LSN ${value}`);
};
export { constructLsn, convertBigIntToLsn, convertLsnToBigInt, convertLsnToBuffer, getUpperAndLowerWAL, incrementWAL, isLsn, toLsn, };
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