Sending Transaction (using telegram)
Step 1: Creating the Transaction
After initializing the SDK, you can create a transaction object using the UserOperationCallData
interface. This object represents the transaction you want to send. Here's an example:
import { UserOperationCallData, sendUserOp } from '@0xgasless/0xgasless-aa-sdk';
import { ethers } from 'ethers';
// Replace with the contract address and ABI of the smart contract you want to interact with
const contractAddress = '0xContractAddress'; // Replace with the contract address
const contractABI = [
// Define the ABI of the contract, including function definitions
// Example: { "constant": false, "inputs": [...], "name": "functionName", "outputs": [...], "type": "function" }
];
// Create an instance of the contract
const contract = new ethers.Contract(contractAddress, contractABI);
// Specify the function you want to call and its parameters
const functionName = 'functionName'; // Replace with the name of the function you want to call
const functionParams = ['param1', 'param2']; // Replace with the function's parameters
// Encode the function call data
const functionInterface = new ethers.utils.Interface(contractABI);
const data = functionInterface.encodeFunctionData(functionName, functionParams);
// Create a transaction object
const transaction: UserOperationCallData = {
target: '0xRecipientAddress', // Replace with the recipient's Ethereum address
data: data, // Replace with the transaction data in hexadecimal format
value: BigInt('1000000000000000000'), // Optional: Replace with the amount in wei (e.g., 1 ETH)
};
In this code:
We import the
UserOperationCallData
interface to define the structure of the transaction object.transaction
is an object that contains thetarget
(recipient's Ethereum address),data
(transaction data in hexadecimal format), and an optionalvalue
field for the transaction amount in wei.
Step 2: Prepare UserOperation and Send OTP on User's Telegram
Now that you have the transaction object, to send userOp there are 2 steps.
Prepare UserOp and send OTP on telegram to user:
First, call prepareUserOp
function on SDK with transaction as an argument to it. It will return with OTP sent success: true/false and requestId.
User will receive OTP on telegram which has to be sent in next step. Implement functionality to get the OTP from user as per your choice.
const { requestId, otpSent } = await sdk.prepareUserOp(trx);
console.log("prepareUserOp",requestId,otpSent);
try {
const requestId = <requestId>;
const otp = <otp>;
const { userOpHash, transactionHash } = await client.sendUserOp(requestId, otp);
console.log('UserOp Hash:', userOpHash);
console.log('Transaction Hash:', txHash);
console.log('Transaction sent successfully');
} catch (error) {
console.error('Transaction failed:', error);
}
In this code:
sendUserOp
takes 2 arguments: requestId and OTP.The
await client.sendUserOp(requestId, otp)
call sends the requestId and OTP and returns an object containing both theuserOpHash
andtransactionHash
.The
userOpHash
is the hash of the user operation, and transactionHash is the hash of the underlying transaction.Both hashes are logged to the console for your reference.
With these steps, you can successfully send a transaction using Telegram and capture both the user operation hash and the transaction hash using the 0xGasless AA SDK.
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