ICONKit 0.4.3

ICONKit 0.4.3

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Maintained by a1ahn, ICONKit.

 
Depends on:
secp256k1_swift>= 0
BigInt>= 0
CryptoSwift= 1.0
 

ICONKit 0.4.3

ICONKit, ICON SDK for Swift

Swift ICONKit-license CocoaPods Platform

ICON supports SDK for 3rd party or user services development. You can integrate ICON SDK for your project and utilize ICON’s functionality.

  • ICONKit now provide Swift 5

Installation

CocoaPods

CocoaPods is a dependency manager for Swift Cocoa projects.

$ sudo gem install cocoapods

To integrate ICONKit into your project, specify it in your Podfile

target '<Your Target Name>' do
    use_frameworks!
    ...
    pod 'ICONKit', '~> 0.4.3'
    ...
end

Now install the ICONKit.

$ pod install

Swift 4.x version

0.3.2 is a last version of ICONKit for Swift 4.x.

try

pod 'ICONKit', '0.3.2'

Quick start

A simple query of the block by height is as follows.

// ICON Mainnet
let iconService = ICONService(provider: "https://ctz.solidwallet.io/api/v3", nid: "0x1")

// Gets a block matching the block height.
let request: Request<Response.Block> = iconService.getBlock(height: height)
let result = request.execute()

switch result {
case .success(let responseBlock):
    ...
case .failure(let error):
    ...
}

ICONService

APIs called through ICONService.

It can be initialized as follows.

let iconService = ICONService(provider: "https://ctz.solidwallet.io/api/v3", nid: "0x1")

Queries

All queries are requested by a Request<T>.

Synchronous

execute() requests a query synchronously.

let response = iconService.getLastBlock().execute()

switch response {
case .success(let responseBlock):
    print(responseBlock.blockHash)
    ...
case .failure(let error):
    print(error.errorDescription)
    ...
}

Asynchronous

You can request a query asynchronously using a async closure as below.

iconService.getLastBlock().async { (result) in
    switch result {
    case .success(let responseBlock):
      print(responseBlock.blockHash)
      ...
    case .failure(let error):
      print(err.errorDescription)
      ...
    }
}

Querying API

The querying APIs are as follows.

getLastBlock

Gets the last block information.

let request: Request<Response.Block> = iconService.getLastBlock()

getBlock(height)

Gets block information by block height.

let request: Request<Response.Block> = iconService.getBlock(height: height)

getBlock(hash)

Gets block information by block hash.

let request: Request<Response.Block> = iconService.getBlock(hash: "0x000...000")

call

Calls a SCORE API. Use the return type of method's outputs you want to call in generic type. For example, the type of output that is String use String.

let call = Call<String>(from: wallet.address, to: scoreAddress, method: "name", params: params)
let request: Request<String> = iconService.call(call) 
let response: Result<String, ICError> = request.execute()

If the output type of method is hex String (ex. "0x56bc75e2d63100000"), you can use String and BigUInt too! Just input BigUInt at generic type, then ICONKit convert the output value to BigUInt. If you want to use hex String, use String.

// Using `BigUInt`
let call = Call<BigUInt>(from: wallet.address, to: scoreAddress, method: "balanceOf", params: params)
let request: Request<BigUInt> = iconService.call(call)
let response: Result<BigUInt, ICError> = request.execute() // return 100000000000000000000 or ICError

// Using `String`
let call = Call<String>(from: wallet.address, to: scoreAddress, method: "balanceOf", params: params)
let request: Request<String> = iconService.call(call)
let response: Result<String, ICError> = request.execute() // return "0x56bc75e2d63100000" or ICError

getBalance

Gets the balance of an given account.

let request: Request<BigUInt> = iconService.getBalance(address: "hx000...1")

getScoreAPI

Gets a list of ScoreAPI.

let request: Request<Response.ScoreAPI> = iconService.getScoreAPI(scoreAddress: "cx000...1")

getTotalSupply

Gets the total supply of ICX.

let request: Request<BigUInt> = iconService.getTotalSupply()

getTransaction

Gets a transaction matching the given transaction hash.

let request: Request<Response.TransactionByHashResult> = iconService.getTransaction(hash: "0x000...000")

getTransactionResult

Gets the transaction result requested by transaction hash.

let request: Request<Response.TransactionResult> = iconService.getTransactionResult(hash: "0x000...000")

Sending transactions

Calling SCORE APIs to change states is requested as sending a transaction.

Before sending a transaction, the transaction should be signed.

Loading wallets and storing the Keystore

// Generates a wallet.
let wallet = Wallet(privateKey: nil)

// Load a wallet from the private key.
let privateKey = PrivateKey(hex: data)
let wallet = Wallet(privateKey: privateKey)

// Save wallet keystore.
let wallet = Wallet(privateKey: nil)
do {
    try wallet.generateKeystore(password: "YOUR_WALLET_PASSWORD")
    try wallet.save(filepath: "YOUR_STORAGE_PATH")
} catch {
    // handle errors
}
// Load a wallet from the keystore.
do {
    let jsonData: Data = try Data(contentsOf: "YOUR_KEYSTORE_PATH")
    let decoder = JSONDecoder()
    let keystore = try decoder.decoder(Keystore.self, from: jsonData)
    let wallet = Wallet(keystore: keystore, password: "YOUR_WALLET_PASSWORD")
} catch {
    // handle errors
}

Creating transactions

// Sending ICX
let coinTransfer = Transaction()
    .from(wallet.address)
    .to(to)
    .value(BigUInt(15000000))
    .stepLimit(BigUInt(1000000))
    .nid(self.iconService.nid)
    .nonce("0x1")

// SCORE function call
let call = CallTransaction()
    .from(wallet.address)
    .to(scoreAddress)
    .stepLimit(BigUInt(1000000))
    .nid(self.iconService.nid)
    .nonce("0x1")
    .method("transfer")
    .params(["_to": to, "_value": "0x1234"])

// Message transfer
let transaction = MessageTransaction()
    .from(wallet.address)
    .to(to)
    .value(BigUInt(15000000))
    .stepLimit(BigUInt(1000000))
    .nonce("0x1")
    .nid(self.iconService.nid)
    .message("Hello, ICON!")

Sending Requests

SignedTransaction object signs a transaction using the wallet.

And a request is executed as Synchronized or Asynchronized like a querying request.

Synchronous request

do {
    let signed = try SignedTransaction(transaction: coinTransfer, privateKey: privateKey)
    let request = iconService.sendTransaction(signedTransaction: signed)
    let response = request.execute()

    switch response {
    case .success(let result):
        print("SUCCESS: TXHash - \(result)")
        ...
    case .failure(let error):
        print("FAIL: \(error.errorDescription)")
        ...
    }
} catch {
      print(error)
      ...
}

Asynchronous request

do {
    let signed = try SignedTransaction(transaction: coinTransfer, privateKey: privateKey)  
    let request = iconService.sendTransaction(signedTransaction: signed)

    request.async { (result) in
        switch result {
        case .success(let result):
            print(result)
            ...
        case .failure(let error):
            print(error.errorDescription)
            ...
        }
    }
} catch {
	print(error)
}

Estimate step

It is important to set a proper stepLimit value in your transaction to make the submitted transaction executed successfully.

estimateStep API provides a way to estimate the Step usage of a given transaction. Using the method, you can get an estimated Step usage before sending your transaction then make a SignedTransaction with the stepLimit based on the estimation.

// Make a raw transaction without the stepLimit
let message = MessageTransaction()
    .from(fromAddress)
    .to(toAddress)
    .nid(self.iconService.nid)
    .message("Hello, ICON!")

// Estimate step
let estimateStepResponse = iconService.estimateStep(transaction: message).execute()
if let estimatedStepCost = try? estimateStepResponse.get() {
    // Add some margin to estimated step
    let stepLimit = estimatedStepCost + 10000
    message.stepLimit(estimatedStepCost)
}

// Send transaction
do {
    let signed = try SignedTransaction(transaction: message, privateKey: yourPrivateKey)
    let response = self.iconService.sendTransaction(signedTransaction: signed).execute()
  
    switch response {
    case .success(let result):
        print("Message tx result - \(result)")
    case .failure(let error):
        print(error)
    }
} catch {
    print(error)
}

Note that the estimation can be smaller or larger than the actual amount of step to be used by the transaction, so it is recommended to add some margin to the estimation when you set the stepLimit of the SignedTransaction.

Converter

ICONKit supports converter functions.

// Convert ICX or gLoop to loop.
let balance: BigUInt = 100
let ICXToLoop: BigUInt = balance.convert() // 100000000000000000000
let gLoopToLoop: BigUInt = balance.convert(unit: .gLoop) // 100000000000

// Convert `BigUInt` value to HEX `String`.
let hexString: String = ICXToLoop.toHexString() // 0x56bc75e2d63100000

// Convert HEX `String` to `BigUInt`.
let hexBigUInt: BigUInt = hexString.hexToBigUInt()! // 100000000000000000000

// Convert HEX `String` to `Date`
let timestamp: String = "0x5850adcbaa178"
let confirmedDate: Date = timestamp.hexToDate()! // 2019-03-27 03:16:22 +0000

Reference

Version

0.4.0

Requirement

  • Xcode 10 or higher
  • iOS 10 or higher
  • Swift 5
  • Cocoapods

License

This project follows the Apache 2.0 License. Please refer to LICENSE for details.