2
Regarding how you can wait until the tx receipt is ready bellow I wrote an example of how:
const balance = contractInstance.methods.balanceOf(walletAddress).call(function(err, result) {
...
web3.eth.getTransactionCount(fromAddress)
.then((count) => {
let rawTransaction = {
'from': fromAddress,
'gasPrice': web3.utils.toHex(10 * 1e9),
...
2
With web3.js v1.2.x, you can use function web3.eth.abi.encodeFunctionSignature:
const selector = web3.eth.abi.encodeFunctionSignature({
type: "function",
name: yourObj.funcName,
inputs: yourObj.params.map(param => ({type: param}))
});
Or simply:
const selector = web3.eth.abi.encodeFunctionSignature("getSupplyRate(address,uint256,uint256)");
...
1
Change this:
let transaction = new Tx(rawTransaction)
transaction.sign(keys[k])
web3.eth.sendSignedTransaction('0x' + transaction.serialize().toString('hex'))
...
To this:
web3.eth.accounts.signTransaction(rawTransaction, privateKey).then(signedTx => {
web3.eth.sendSignedTransaction(signedTx);
...
})
1
Transaction was failing because of fixed gasLimit : 37000.
Gas depends on what the function is doing.
For example, it is more expensive to set a zero-value storage value to non-zero, than it is to set a non-zero storage value to another non-zero storage value.
In my case it was because of SSTORE opcode as it takes 20000 when storage value is set to non-...
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