@cityofzion/neon-api/lib/api/getTokenBalances.js

Neon-API module: High level API for neon-js

import { sc, u } from "@cityofzion/neon-core";
const CHUNK_SIZE = 2;
export async function getTokenBalances(address, contracts, client) {
    const script = contracts
        .map((scriptHash) => scriptHash instanceof sc.Nep17Contract
        ? scriptHash
        : new sc.Nep17Contract(scriptHash))
        .map((contract) => [contract.decimals(), contract.balanceOf(address)])
        .reduce((sb, contractCalls) => {
        contractCalls.forEach((cc) => sb.emitContractCall(cc));
        return sb;
    }, new sc.ScriptBuilder())
        .build();
    const response = await client.invokeScript(u.HexString.fromHex(script));
    if (response.state === "FAULT") {
        throw new Error(response.exception
            ? `Invoke exception: ${response.exception}}`
            : "No exception message returned.");
    }
    const expectedStackLength = contracts.length * CHUNK_SIZE;
    if (response.stack.length !== expectedStackLength) {
        throw new Error(`Received unexpected results. Expected ${expectedStackLength} but got ${response.stack.length} instead.`);
    }
    const results = [];
    for (let i = 0; i < response.stack.length; i += CHUNK_SIZE) {
        results.push(response.stack.slice(i, i + 3));
    }
    return results.map((result) => {
        const decimals = parseInt(result[0].value);
        return u.BigInteger.fromNumber(result[1].value).toDecimal(decimals);
    });
}
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