I have this javascript object :
Transaction {
id: '2ec34280-567d-11e9-9685-4903db7a1a5b',
type: 'TRANSACTION',
input:
{ timestamp: 1554343126696,
from:
'6db64cd01c27a723395a833d72b3cc81f9110b5ffb34429d91f45fcbfd87ec9b',
signature:
Signature {
eddsa: [EDDSA],
_R: [Point],
_S: [BN],
_Rencoded: [Array],
_Sencoded: undefined } },
output: { to: 'rand-address', amount: 9, fee: 1 } }
When I try to do a res.json on it, I seem to get this error :
TypeError: Converting circular structure to JSON
Some code that may be relevant :
// Endpoint that a user accesses (the start of the event)
app.post("/transact", (req, res) => {
const { to, amount, type } = req.body;
const transaction = wallet.createTransaction(
to,
amount,
type,
blockchain,
transactionPool
);
res.redirect("/transactions");
});
the createTransaction method which is mentioned above, looks like this :
createTransaction(to, amount, type, blockchain, transactionPool) {
this.balance = this.getBalance(blockchain);
if (amount > balance) {
console.log(
`Amount: ${amount} exceeds the current balance: ${this.balance}`
);
return;
}
let transaction = Transaction.newTransaction(this, to, amount, type);
transactionPool.addTransaction(transaction);
return transaction;
}
the newTransaction method :
static newTransaction(senderWallet, to, amount, type) {
if (amount + TRANSACTION_FEE > senderWallet.balance) {
console.log(`Not enough balance`);
return;
}
return Transaction.generateTransaction(senderWallet, to, amount, type);
}
Which calls the generateTransaction method below :
static generateTransaction(senderWallet, to, amount, type) {
const transaction = new this();
transaction.type = type;
transaction.output = {
to: to,
amount: amount - TRANSACTION_FEE,
fee: TRANSACTION_FEE
};
Transaction.signTransaction(transaction, senderWallet);
return transaction;
}
Which in turn calls the signTransaction method :
static signTransaction(transaction, senderWallet) {
transaction.input = {
timestamp: Date.now(),
from: senderWallet.publicKey,
signature: senderWallet.sign(ChainUtil.hash(transaction.output))
};
}
the chainUtil hash function looks like this :
static hash(data){
return SHA256(JSON.stringify(data)).toString();
}
The sign method on the wallet class :
sign(dataHash){
return this.keyPair.sign(dataHash);
}
they all return and I get the object I mentioned at the top of this question. I'm not seeing how the issue is a circular error at all. Please, educate me.
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