I am confused about how I should be executing a contract's method using the web3 1.0 library.
This code works (so long as I manually unlock the account first):
var contract = new web3.eth.Contract(contractJson, contractAddress);
contract.methods
.transfer("0x0e0479bC23a96F6d701D003c5F004Bb0f28e773C", 1000)
.send({
from: "0x2EBd0A4729129b45b23aAd4656b98026cf67650A"
})
.on('confirmation', (confirmationNumber, receipt) => {
io.emit('confirmation', confirmationNumber);
});
I get this error (if I don't unlock manually first):
Returned error: authentication needed: password or unlock
The above code is an API endpoint in node.js, so I want it to unlock or authenticate programmatically.
There is no method in web3.js 1.0 to unlock the account.
I also don't think this is necessary (at least that's what I am confused about). Since I am managing accounts, I know what the private key is.
I am thinking the transaction needs to be signed with the private key?? Is this correct? Is this effectively the same thing as "unlocking the account"?
I tried doing this:
var contract = new web3.eth.Contract(contractJson, contractAddress);
var tx = {
from: "...{fromAddress -- address that has the private key below}",
to: "...",
value: ...
};
var signed = web3.eth.accounts.signTransaction(tx,
"...{privateKey}");
console.log(signed);
var promise = web3.eth.sendSignedTransaction(signed);
I get this error:
Returned error: The method net_version does not exist/is not available
What is the easiest way to authenticate and submit a transaction?
Ideally, I want to use the first approach in my code sample, as it is the cleanest.
This code allows me to sign a transaction server-side (node.js) using the privateKey from the account I created (using web3.eth.accounts.create()), and send the signed transaction to the network without having to unlock the account.
I am using Geth 1.7.1
var contract = new web3.eth.Contract(contractJson, contractAddress);
var transfer = contract.methods.transfer("0x...", 490);
var encodedABI = transfer.encodeABI();
var tx = {
from: "0x...",
to: contractAddress,
gas: 2000000,
data: encodedABI
};
web3.eth.accounts.signTransaction(tx, privateKey).then(signed => {
var tran = web3.eth.sendSignedTransaction(signed.rawTransaction);
tran.on('confirmation', (confirmationNumber, receipt) => {
console.log('confirmation: ' + confirmationNumber);
});
tran.on('transactionHash', hash => {
console.log('hash');
console.log(hash);
});
tran.on('receipt', receipt => {
console.log('reciept');
console.log(receipt);
});
tran.on('error', console.error);
});