Reading Balances: Utilizing Sails Queries

To read the balances of accounts, utilize the Sails-JS queries provided by the generated program.

A particular service of the program contains all the necessary query methods for managing tokens state, such as balance and allowance. By using these methods, the current state of the program can be easily obtained.

Reading Balances

To get the balance of a developer's account, use the balanceOf method from the VFT service of the program instance. This method takes the account's address as a parameter and returns the balance.

Similarly, to get the balance of Alice's account, use the balanceOf method from the VFT service of the program instance. This method takes Alice's account address as a parameter and returns the balance.

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Mint and Transfer Transactions

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Transfer Event Subscription

import { decodeAddress, GearApi } from '@gear-js/api';
import { Keyring } from '@polkadot/api';
import { mnemonicGenerate } from '@polkadot/util-crypto';

import { Program } from './lib';

const VARA_TESTNET_ENDPOINT = 'wss://testnet.vara.network';
const api = await GearApi.create({ providerAddress: VARA_TESTNET_ENDPOINT });

const mnemonic = mnemonicGenerate();
const keyring = new Keyring({ type: 'sr25519' }).addFromMnemonic(mnemonic);
const aliceKeyring = new Keyring({ type: 'sr25519' }).addFromUri('//Alice');
const accountAddress = decodeAddress(keyring.address);
const aliceAccountAddress = decodeAddress(aliceKeyring.address);

const TOKEN = {
  NAME: 'Tutorial Token',
  SYMBOL: 'TT',
  DECIMALS: 12,
} as const;

const TOKENS_AMOUNT = 1 * 10 ** TOKEN.DECIMALS;

const PROGRAM_ID = '0x00';
const vftProgram = new Program(api, PROGRAM_ID);

const mintTokens = async () => {
  const mintTransaction = await vftProgram.vft
    .mint(accountAddress, TOKENS_AMOUNT)
    .withAccount(keyring)
    .calculateGas();

  const { response: mintResponse } = await mintTransaction.signAndSend();

  const mintResult = await mintResponse();

  return mintResult;
};

const transferTokens = async () => {
  const transferTransaction = await vftProgram.vft
    .transfer(aliceAccountAddress, TOKENS_AMOUNT)
    .withAccount(keyring)
    .calculateGas();

  const { response: transferResponse } =
    await transferTransaction.signAndSend();

  const transferResult = await transferResponse();

  return transferResult;
};

const getBalance = async () => {
  const queryResult = await vftProgram.vft.balanceOf(accountAddress);

  return queryResult;
};

const getAliceBalance = async () => {
  const queryResult = await vftProgram.vft.balanceOf(aliceAccountAddress);

  return queryResult;
};

Reading Balances: Utilizing Sails Queries

To read the balances of accounts, utilize the Sails-JS queries provided by the generated program.