solana-sniper-bot/transactions/default-transaction-executor.ts

import {
	BlockhashWithExpiryBlockHeight,
	Connection,
	Keypair,
	Transaction,
	VersionedTransaction,
} from "@solana/web3.js";
import { TransactionExecutor } from "./transaction-executor.interface";
import { logger } from "../helpers";

export class DefaultTransactionExecutor implements TransactionExecutor {
	constructor(private readonly connection: Connection) {}

	public async executeAndConfirm(
		transaction: VersionedTransaction,
		payer: Keypair,
		latestBlockhash: BlockhashWithExpiryBlockHeight,
	): Promise<{ confirmed: boolean; signature?: string; error?: string }> {
		logger.debug("Executing transaction...");
		const signature = await this.execute(transaction);

		logger.debug({ signature }, "Confirming transaction...");
		return this.confirm(signature, latestBlockhash);
	}

	private async execute(transaction: Transaction | VersionedTransaction) {
		return this.connection.sendRawTransaction(transaction.serialize(), {
			preflightCommitment: this.connection.commitment,
		});
	}

	private async confirm(signature: string, latestBlockhash: BlockhashWithExpiryBlockHeight) {
		const confirmation = await this.connection.confirmTransaction(
			{
				signature,
				lastValidBlockHeight: latestBlockhash.lastValidBlockHeight,
				blockhash: latestBlockhash.blockhash,
			},
			this.connection.commitment,
		);

		return { confirmed: !confirmation.value.err, signature };
	}
}