@ton/core/src/dict/generateMerkleUpdate.ts

Core TypeScript library that implements low level primitives for TON blockchain.

import { beginCell } from '../boc/Builder';
import { Cell } from '../boc/Cell';
import { DictionaryKeyTypes, Dictionary, DictionaryKey } from './Dictionary';
import { generateMerkleProof } from './generateMerkleProof';

function convertToMerkleUpdate(c1: Cell, c2: Cell): Cell {
    return beginCell()
        .storeUint(4, 8)
        .storeBuffer(c1.hash(0))
        .storeBuffer(c2.hash(0))
        .storeUint(c1.depth(0), 16)
        .storeUint(c2.depth(0), 16)
        .storeRef(c1)
        .storeRef(c2)
        .endCell({ exotic: true });
}

export function generateMerkleUpdate<K extends DictionaryKeyTypes, V>(
    dict: Dictionary<K, V>,
    key: K,
    keyObject: DictionaryKey<K>,
    newValue: V
): Cell {
    const oldProof = generateMerkleProof(dict, [key], keyObject).refs[0];
    dict.set(key, newValue);
    const newProof = generateMerkleProof(dict, [key], keyObject).refs[0];
    return convertToMerkleUpdate(oldProof, newProof);
}