e.g. node Token_Transfer.js RPC_IP RPC_Port from_address to_address amount contract_address private_key decimals
Copy //to execute the script run the following command
// node file_name.js wallet_ip port from_address to_address amount contract_address private_key decimals
//ip and port for the blockchain node to be connected
var wallet_ip = process.argv[2];
var wallet_port = process.argv[3];
//address from which tokens need to be sent
var from_address = process.argv[4];
//address to which tokens need to be sent
var to_address = process.argv[5];
//amount of tokens to be sent
var sendamount = process.argv[6];
//contract address of the ERC20 token
var coinAddress = process.argv[7];
//private key of the from address
var private_key = process.argv[8];
//predefined no. of decimals in the contract
var tokendecimal = process.argv[9];
//web3 library needed
const Web3 = require("xdc3");
//connecting to the web3 provider
if (typeof web3 !== "undefined") {
web3 = new Web3(web3.currentProvider);
} else {
web3 = new Web3(
new Web3.providers.HttpProvider("http://" + wallet_ip + ":" + wallet_port)
);
}
//if the token decimal isn't specified then set it to default 18 and converting the amount to decimal form
if (tokendecimal == 18 || tokendecimal == null) {
var send_amount = web3.utils.toWei(sendamount);
} else {
var send_amount = sendamount * Math.pow(10, tokendecimal);
}
//data required for estimating the gas that will be needed for the transaction to complete
var est_main_gas = { from: from_address, to: to_address, value: send_amount };
//standard ERC20 contract ABI
const coinabi = [
{
constant: true,
inputs: [],
name: "name",
outputs: [{ name: "", type: "string" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: false,
inputs: [
{ name: "_spender", type: "address" },
{ name: "_value", type: "uint256" }
],
name: "approve",
outputs: [{ name: "success", type: "bool" }],
payable: false,
stateMutability: "nonpayable",
type: "function"
},
{
constant: true,
inputs: [],
name: "totalSupply",
outputs: [{ name: "", type: "uint256" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: false,
inputs: [
{ name: "_from", type: "address" },
{ name: "_to", type: "address" },
{ name: "_value", type: "uint256" }
],
name: "transferFrom",
outputs: [{ name: "success", type: "bool" }],
payable: false,
stateMutability: "nonpayable",
type: "function"
},
{
constant: true,
inputs: [],
name: "decimals",
outputs: [{ name: "", type: "uint256" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: true,
inputs: [{ name: "_owner", type: "address" }],
name: "balanceOf",
outputs: [{ name: "balance", type: "uint256" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: true,
inputs: [],
name: "owner",
outputs: [{ name: "", type: "address" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: true,
inputs: [],
name: "symbol",
outputs: [{ name: "", type: "string" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: false,
inputs: [
{ name: "_to", type: "address" },
{ name: "_value", type: "uint256" }
],
name: "transfer",
outputs: [{ name: "success", type: "bool" }],
payable: false,
stateMutability: "nonpayable",
type: "function"
},
{
constant: true,
inputs: [
{ name: "_owner", type: "address" },
{ name: "_spender", type: "address" }
],
name: "allowance",
outputs: [{ name: "remaining", type: "uint256" }],
payable: false,
stateMutability: "view",
type: "function"
},
{
constant: false,
inputs: [{ name: "_newOwner", type: "address" }],
name: "transferOwnership",
outputs: [],
payable: false,
stateMutability: "nonpayable",
type: "function"
},
{
inputs: [],
payable: false,
stateMutability: "nonpayable",
type: "constructor"
},
{
anonymous: false,
inputs: [
{ indexed: true, name: "from", type: "address" },
{ indexed: true, name: "to", type: "address" },
{ indexed: false, name: "value", type: "uint256" }
],
name: "Transfer",
type: "event"
},
{
anonymous: false,
inputs: [
{ indexed: true, name: "owner", type: "address" },
{ indexed: true, name: "spender", type: "address" },
{ indexed: false, name: "value", type: "uint256" }
],
name: "Approval",
type: "event"
}
];
//creating an instance of the ERC20 contract
const coin = new web3.eth.Contract(coinabi, coinAddress);
//checking the balance of the from address to asure that it has sufficient balance to complete the transaction
coin.methods.balanceOf(from_address).call(function(err, bal) {
bal = web3.utils.fromWei(bal, "wei").toString(10);
//generating the data for the transfer method of the ERC20 contract
const txdata = coin.methods.transfer(to_address, send_amount).encodeABI(); //to address
//estimating the gas required for the transaction to be completed
web3.eth.estimateGas(est_main_gas, function(gaslimit_err, gaslimit) {
//getting the current gas price on the network or else setting it to minimum 4 Gwei so that it won't take much time to execute
web3.eth.getGasPrice(function(gas_err, getGasPrice) {
if (gas_err) {
console.log(JSON.stringify({ error1: gas_err }));
getGasPrice = 4000000000;
} else {
if (getGasPrice < 4000000000 || getGasPrice == null) {
getGasPrice = 4000000000;
}
}
//finding the nonce for the from address
web3.eth.getTransactionCount(from_address, function(
tx_count_err,
transactionCount
) {
if (tx_count_err) {
console.log(
JSON.stringify({ "transaction count error ": tx_count_err })
);
}
//generating the transaction data
const trans_det = {
nonce: transactionCount, // Replace by nonce for your account on geth node
gasPrice: getGasPrice,
gas: "200000",
to: coinAddress, //contract address
from: from_address, //coin base
data: txdata
};
//signing the transaction generated to get a raw transaction
web3.eth.accounts.signTransaction(trans_det, private_key, function(
sign_error,
signedTransaction
) {
if (sign_error) {
console.log(
JSON.stringify({ "sign transaction error ": sign_error })
);
}
//raw transaction to be sent to the network.
const rawTransaction = signedTransaction.rawTransaction;
//sending the raw transaction after converting it in to hex format
web3.eth.sendSignedTransaction(
rawTransaction.toString("hex"),
function(trans_err, txid) {
//printing the transaction hash or error
if (trans_err)
console.log(JSON.stringify({ "transaction error": trans_err }));
if (txid && txid != "")
console.log(JSON.stringify({ tx: txid, hash: txid }));
}
);
});
});
});
});
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