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I tried this method to deploy a contract. It is described in the web3.eth.Contract documentation.

var contract = new web3.eth.Contract (JSON.parse (abi_json_string)); contract.deploy ({ data: contract_bytecode }).send ({ from: from_acct, gas: 160000, gasPrice: 8000000 });

However, it gives me the following error:

authentication needed: password or unlock

I can't find a way to sign the transaction using this method. All the examples, show it as a simple call to deploy and then send. What if you want to sign it first?

So I tried deploying a contract using the same method that I use to sign and send regular ether transactions.

var transaction_data = { from: from_account, to: "0x0000000000000000000000000000000000000000", data: contract_bytecode, gas: 160000, gasPrice: 8000000, nonce: nonce }; var common = eth_common_lib.forCustomChain ('ropsten', { networkId: 1994, chainId: 1994, name: 'geth' }, 'muirGlacier'); var transaction = new eth_tx_lib.Transaction (transaction_data, { "common": common }); var bytes = []; for (var b = 0; b < private_key.length; b += 2) { var hex_byte = private_key.substr (b, 2); var int_byte = parseInt (hex_byte, 16); bytes.push (int_byte); } transaction.sign (Buffer.from (bytes)); var serialized_transaction = transaction.serialize (); web3.eth.sendSignedTransaction ("0x" + serialized_transaction.toString ("hex")).catch ((error) => { console.log (error); });

I get a receipt when I do it this way but it shows the contractAddress as null. I'm guessing that means the deployment failed.

contractAddress: null

Is web3.eth.Contract the only possible way to deploy a contract? If so, is there a way to do it from a locked account?

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1 Answer 1

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Try this (tested with web3.js v1.2.1):

const Web3 = require("web3"); const NODE_ADDRESS = "YourNodeAddress"; const PRIVATE_KEY = "YourPrivateKey"; const CONTRACT_ARGS = ["arg1", "arg2"]; async function send(web3, account, transaction) { const options = { data: transaction.encodeABI(), gas : await transaction.estimateGas({from: account.address}) }; const signed = await web3.eth.accounts.signTransaction(options, account.privateKey); const receipt = await web3.eth.sendSignedTransaction(signed.rawTransaction); return receipt; } async function run() { const web3 = new Web3(NODE_ADDRESS); const account = web3.eth.accounts.privateKeyToAccount(PRIVATE_KEY); const contract = new web3.eth.Contract(JSON.parse(abi_json_string)); const options = {data: contract_bytecode, arguments: CONTRACT_ARGS}; const transaction = contract.deploy(options); const receipt = await send(web3, account, transaction); console.log(receipt.contractAddress); if (web3.currentProvider.constructor.name == "WebsocketProvider") web3.currentProvider.connection.close(); } run();
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