Web3swift.Web3Error.processingError(desc: "Failed to fetch nonce").

[ayjayem]

Hi there,

This seems like a great library - thanks so much for providing!

I am facing a stubborn issue: Fatal error: 'try!' expression unexpectedly raised an error: Web3swift.Web3Error.processingError(desc: "Failed to fetch nonce").

I am importing one of my own addresses, and then trying to send a transaction using the snippet below. I'm sure I'm just doing something silly - any assistance would be very much appreciated:

let web3 = Web3.InfuraMainnetWeb3()
let walletAddress = EthereumAddress(wallet!.address!)!

let contractMethod = "approve"
let DAIcontractAddress = EthereumAddress(daiAddressString)!
let abiVersion = 2

let approvalUnits = "1000"
let approveAmount = Web3.Utils.parseToBigUInt(approvalUnits, units: .wei)!

let approveAddress = EthereumAddress(erc20AddressString)!

let parameters: [AnyObject] = [approveAddress as AnyObject, approveAmount as AnyObject] as [AnyObject]
let extraData: Data = Data()
let contract = web3.contract(Web3.Utils.erc20ABI, at: DAIcontractAddress, abiVersion: abiVersion)!
var options = TransactionOptions.defaultOptions
options.from = walletAddress
options.gasPrice = .automatic
options.gasLimit = .automatic
let tx = contract.write(
    contractMethod,
    parameters: parameters,
    extraData: extraData,
    transactionOptions: options)!

_ = try! tx.send(password: password)

[ayjayem]

Using my own Infura endpoint resolved this particular error.

Now instead I'm getting the following error: typeMismatch(Swift.Array, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array but found a dictionary instead.", underlyingError: nil))

Again, I'm sure I'm just doing something silly. Leaving this here in case anyone else encounters something similar.

[ayjayem]

I did do something silly: needed to attach the keystore manager to my web3 instance...

web3.addKeystoreManager( KeystoreManager( [keystore] ) )

Thanks again for the library!

[skywinder]

@alexandermucalov, you are always welcome. Glad that you found it useful. 👍

Here are some followup comments regarding this:

Keep in mind that enchantments & pull requests to this repo are eligible for the GitCoin grant program we received.
So if you are willing to contribute - don't hesitate to do this. I will make a bounty (by ETH or Dai) to reward your contribution!

so let me know if you can

1. improve the documentation and codebase:

• add convenience methods to this library (if you can know how to improve the developer experience with web3swift and keystore management as an example)
• describe how to set up or how setup your Infura endpoint - it would be super helpful for others. sure because many issues happened because of public Infura node, as it described in this issue: Return nil on tx.call() (was not there few days ago)  #239

ps.
I would like to know on which project are you working on. Feel free to add your Dapp to the section: https://github.com/matter-labs/web3swift#projects-that-are-using-web3swift

[skywinder]

@alexandermucalov since you are active user, would you like to help with this for the bounty?

[skywinder]

@AnnaYatsun1 please kindly check this issue and how web3.addKeystoreManager( KeystoreManager( [keystore] ) ) works with latest release