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Here is an article that explains the problem with eth.sign() returning null when calling the Metamask setting on localhost.
Problem: eth.sign() never returns or gets called
When using local Ganache with Metamask set to localhost, you might encounter problems signing transactions. In particular, eth.sign() does not call the back function, which can prevent a node from processing a transaction.
Here is an article that explains how to fix this problem:
Sign transactions in local metamask settings
In your code snippet, I see you have a recursive call to sign(), but it returns nothing. The recursive call is unnecessary and causes the function to return “null” or undefined. This prevents the Ethereum node from signing the transaction.
Instead of calling back() on each iteration, we can simply handle any errors that may occur during signing.
Here is an example of how you can modify your code snippet:
asynchronous function sign() {
try {
const tx = await web3.eth.signTransaction({
from: '0x...',
to: '0x...',
value: '10000000000000000...', // Example amount
Gas limit: 20000,
nonce: Math.floor((web3.eth.getTransactionCount('0x...')) * 2),
});
web3.eth.sendSignedTransaction(tx.rawTransaction).then((txHash) => {
console.log(Transaction successfully signed: ${txHash});
}).catch((error) => {
console.error(Error signing transaction: ${error.message});
});
} catch (error) {
console.error('Error signing transaction:', error);
}
}
In this modified version, we use web3.eth.signTransaction() to create a signed transaction object. We then call sendSignedTransaction() with the raw transaction as an argument.
Note that back() is not needed in this case because sendSignedTransaction() will handle any errors that may occur during signing.
Why does eth.sign() never return or get called?
When calling eth.signTransaction(), the node expects a function call on its blockchain, which can be useful for creating digital signatures. However, when using local Ganache with Metamask setup on the localhost, this function is called internally by the Ethereum node.
The Ethereum node does not call eth.sign() immediately; instead, it schedules the transaction signing process in the background and returns a promise to wait for it to complete. This is where the problem arises: if we don’t handle errors that might occur during signing, the node will never process the transaction due to the recursive call.
By using catch blocks to handle any errors that might occur during signing, we can ensure that the transaction is successfully signed even on local Metamask settings.