solana_web3 0.0.2+6

The Solana Dart API built on Solana's JSON RPC API, with support for common Native Programs.

example/main.dart

/// Imports
import 'package:solana_web3/solana_web3.dart' as web3;
import 'package:solana_web3/programs/system.dart';

/// Transfer tokens from one wallet to another.
void main(final List<String> arguments) async {

  // Create a connection to the devnet cluster.
  final cluster = web3.Cluster.devnet;
  final connection = web3.Connection(cluster);

  print('Creating accounts...\n');

  // Create a new wallet to transfer tokens from.
  final wallet1 = await createWalletWithBalance(connection, amount: 2);
  final address1 = wallet1.publicKey;

  // Create a new wallet to transfer tokens to.
  final wallet2 = await createWalletWithBalance(connection, amount: 0);
  final address2 = wallet2.publicKey;

  // Check the account balances before making the transfer.
  final balance = await connection.getBalance(wallet1.publicKey);
  print('Account $address1 has an initial balance of $balance lamports.');
  print('Account $address2 has an initial balance of 0 lamports.\n');

  // Create a System Program instruction to transfer 1 SOL from [address1] to [address2].
  final transaction = web3.Transaction();
  transaction.add(
    SystemProgram.transfer(
      fromPublicKey: address1, 
      toPublicKey: address2, 
      lamports: web3.solToLamports(1),
    ),
  );

  // Send the transaction to the cluster and wait for it to be confirmed.
  print('Send and confirm transaction...\n');
  await connection.sendAndConfirmTransaction(
    transaction, 
    signers: [wallet1], // Fee payer + transaction signer.
  );

  // Check the updated account balances.
  final wallet1balance = await connection.getBalance(wallet1.publicKey);
  final wallet2balance = await connection.getBalance(wallet2.publicKey);
  print('Account $address1 has an updated balance of $wallet1balance lamports.');
  print('Account $address2 has an updated balance of $wallet2balance lamports.');
}

/// Creates a new wallet and airdrops [amount] tokens to the address.
/// 
/// NOTE: Keep the value of [amount] low (e.g. 1 or 2).
/// 
/// WARNING: Airdrops cannot be performed on the mainnet.
Future<web3.Keypair> createWalletWithBalance(
  final web3.Connection connection, { 
  required final int amount, 
}) async {

  // Create a new wallet and get its public address.
  final wallet = web3.Keypair.generate();
  final address = wallet.publicKey;

  // Airdrop some test tokens to the wallet address.
  // NOTE: Airdrops cannot be performed on the mainnet.
  if (amount > 0) {
    final lamports = web3.lamportsPerSol * amount;
    final transactionSignature = await connection.requestAirdrop(address, lamports);
    await connection.confirmTransaction(transactionSignature);
  }

  return wallet;
}