Metamask: eth.sign() never returns also does not call back
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Here is an article explaining the issue where eth.sign() returns null when Metamask setup is called on localhost.
Problem: eth.sign() never returns or calls
When using local Ganache with Metamask set to localhost, you may encounter issues signing transactions. Specifically, eth.sign() does not call the back function, which may prevent the node from processing the transaction.
Here is an article explaining how to fix this issue:
Sign Transactions in Local Metamask Setup
In the code snippet, I see that you have a recursive call to sign(), but it does not return anything. The recursive call is unnecessary, so the function returns null or undefined. This prevents the transaction from being signed by the Ethereum node.
Instead of calling back() on every iteration, we can simply handle any errors that may occur during signing.
Here is an example of how you can change the code snippet:
async function sign() {
try {
const tx = await web3.eth.signTransaction({
from: '0x...',
to: '0x...',
value: '1000000000000000...', // Sample amount
gas limit: 20,000,
nonce: Math.floor((web3.eth.getTransactionCount('0x...')) * 2),
});
web3.eth.sendSignedTransaction(tx.rawTransaction).then((txHash) => {
console.log(Transaction signed successfully: ${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 callsendSignedTransaction()’ with the raw transaction as an argument.
Note that back()' is not needed in this case, assendSignedTransaction()’ will handle any errors that may occur during signing.
Why does eth.sign()' never return or call back?
When callingeth.signTransaction()’, the node expects the function to call its own blockchain, which can be useful for creating digital signatures. However, when using local Ganache with Metamask setup localhost', this function is called by the Ethereum node.
The Ethereum node does not immediately calleth.sign()’; instead, it schedules the transaction signing process in the background and returns a promise to wait until it completes. This is where the problem arises: if we don’t handle any errors that might occur during signing, the recursive call will cause the node to never process the transaction.
By using catch blocks to handle any errors that might occur during signing, we can ensure that the transaction is successfully signed even with native Metamask setups.
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