Telos EVM JS SDK

Installation

Requires nodejs and npm installed

npm install telos-evm-js

How to setup EVM and deploy ERC-20 Token on EOSIO in 5 minutes

const { TelosApiEvmApi } = require('telos-evm-js')

const evmContractAccount = 'evmcontract2'
const evmNormalAccount = 'evmaccount11'
const SYSTEM_SYMBOL = 'TLOS'

const api = new TelosEvmApi({
  // Ensure the API has console printing enabled
  endpoint: 'https://api.telos-test.eostribe.io',

  // Must match the chain ID the contract is compiled with (1 by default)
  chainId: 1,

  // Enter your own private keys if you wish to sign transaction (examples provided)
  ethPrivateKeys: [
    // Public Key: 0xf79b834a37f3143f4a73fc3934edac67fd3a01cd
    '0x8dd3ec4846cecac347a830b758bf7e438c4d9b36a396b189610c90b57a70163d',
  ],

  // Enter Telos account that EVM is at / will be deployed to
  tlosContract: evmContractAccount,

  // Enter your own private keys (examples provided)
  tlosPrivateKeys: [
    // evmcontract2 (EOS7DJzWuEr1Zu36ZX8GXwGsvNNqdGqx8QRs7KPkqCMTxG6MBT1Eu)
    '5JACk8gJ98x3AkypbicNQviXzkqAM2wbbE3FtA79icT2Ks4bWws',
    // evmaccount11 (EOS8Z9y2b1GfAkFUQxBTsiu9DJSLebVoU8cpwLAfXcgWDRWg9aM2Q)
    '5JhwbcHTVk16Pv7fCgitNSHgwGwjAPEgEJbiaCcXaza1PKrbCns'
  ]
})

// Import contract compiled with solc (check telos-evm-js/src/eth-contracts/compile.ts to compile your own)
// We provide compiled ERC20 and ERC721 contracts
const compiledErc20AndErc721 = require('telos-evm-js/dist/eth-contracts/compiled.json')

// Load ETH contracts with abi and bytecode, plus the TX sending Telos account
api.loadContractFromAbi({
  account: evmNormalAccount, // Example Telos account
  abi: compiledErc20AndErc721.contracts.ERC20.Token.abi,
  bytecodeObject: compiledErc20AndErc721.contracts.ERC20.Token.evm.bytecode.object
})

async function main () {
  // Deploy EVM contract to EOSIO (deploys to tlosContract provided in new TelosEvmApi)
  await api.tlos.setupEvmContract()

  // For development (if TESTING is enabled in contract), clears all data in contract
  await api.tlos.clearAll()

  // Creates new address based on RLP(eosaccount, arbitrarydata)
  await api.tlos.create({ account: evmNormalAccount, data: 'test' })

  // Transfer Telos to contract to deposit to address
  await api.tlos.deposit({ from: evmNormalAccount, quantity: `0.0002 ${SYSTEM_SYMBOL}` })

  // Get all data for new address (address, account, nonce, balance, code)
  const sender = await api.tlos.getEthAccountByEosAccount(evmNormalAccount)
  console.log(`${sender.address} (${evmNormalAccount}) Balance:`, sender.balance) // 0.0001 TLOS
  console.log(`${sender.address} (${evmNormalAccount}) Nonce:`, sender.nonce) // 0

  // Deploy ERC20 contract (Name, Symbol, Decimals, Total Supply)
  // The returned response "eth" is the EVM transaction receipt, and "tlos" is the Telos transaction receipt
  const { eth, tlos } = await api.eth.deploy('FIRE Token', 'FIRE', 4, 1000000, { sender: sender.address })

  // Set the created address as the EVM contract to interact with
  api.setEthereumContract(eth.createdAddress)

  // Query ERC20 balance using "view" function calls
  console.log(`${sender.address} FIRE Balance: `, +(await api.eth.balanceOf(sender.address)).toString(10)) // 1,000,000

  // New receiver address to send tokens to
  const receiver = '0xf79b834a37f3143f4a73fc3934edac67fd3a01cd'

  // Transfer system tokens to address to create it
  await api.transfer({ account: evmNormalAccount, sender: sender.address, to: receiver, quantity: `0.0001 ${SYSTEM_SYMBOL}` })

  // Transfer 1000 FIRE ERC20 tokens
  await api.eth.transfer(receiver, 1000, { sender: sender.address })

  // Query ERC20 FIRE balance using "view" function calls
  console.log(`${sender.address} Balance:`, +(await api.eth.balanceOf(sender.address)).toString(10), 'FIRE') // 999,000
  console.log(`${receiver} Balance:`,       +(await api.eth.balanceOf(receiver)).toString(10), 'FIRE'), //   1,000

  // Set allowance, and modify it
  await api.eth.approve(receiver, 100, { sender: sender.address })
  await api.eth.increaseAllowance(receiver, 1000, { sender: sender.address })
  await api.eth.decreaseAllowance(receiver, 600, { sender: sender.address })

  // Query allowance (another example of using non-state modifying calls)
  const allowance = await api.eth.allowance(sender.address, receiver, { sender: receiver })
  console.log(`Allowance for ${sender.address}->${receiver}:`, +allowance.toString(10), 'FIRE') // 500

  // Use the allowance to transfer
  // rawSign uses ethereum private key to sign instead of EOSIO account permissions
  await api.eth.transferFrom(sender.address, receiver, 500, { sender: receiver, rawSign: true })

  // Withdraw tokens
  await api.tlos.withdraw({ account: evmNormalAccount, quantity: `0.0001 ${SYSTEM_SYMBOL}` })

  // Other available functions, check docs
  // await getStorageAt(address, key)
  // await createEthTx({ sender, data, gasLimit, value, to, rawSign = false })
  // async getNonce(address)
  // async getEthAccount(address)
}

main()

API

Table of Contents

• TelosEvmApi
  • setEthereumContract
    • Parameters
  • loadContractFromAbi
    • Parameters
  • transfer
    • Parameters
  • createEthTx
    • Parameters
• TelosApi
  • Parameters
  • transact
    • Parameters
  • raw
    • Parameters
  • call
    • Parameters
  • create
    • Parameters
  • withdraw
    • Parameters
  • deposit
    • Parameters
  • clearAll
  • getTable
    • Parameters
  • getAllAddresses
    • Parameters
  • getEthAccount
    • Parameters
  • getNonce
    • Parameters
  • getNonce
    • Parameters
  • getStorageAt
    • Parameters
  • getEthAccountByEosAccount
    • Parameters
  • setupEvmContract
    • Parameters
• TelosApi
  • transact
    • Parameters
  • raw
    • Parameters
  • call
    • Parameters
  • create
    • Parameters
  • withdraw
    • Parameters
  • deposit
    • Parameters
  • clearAll
  • getTable
    • Parameters
  • getAllAddresses
    • Parameters
  • getEthAccount
    • Parameters
  • getNonce
    • Parameters
  • getNonce
    • Parameters
  • getStorageAt
    • Parameters
  • getEthAccountByEosAccount
    • Parameters
  • setupEvmContract
    • Parameters

TelosEvmApi

setEthereumContract

Sets the address for ethereum contract

Parameters

• contract ethereum contract address

loadContractFromAbi

Initializes Web3 like interface to send actions to EVM

Parameters

• args object Arguments (optional, default {})
  • args.account string? EOSIO account to interact with EVM
  • args.abi object? ABI object
  • args.bytecodeObject string? Bytecode object

transfer

Transfers value inside EVM

Parameters

• overrides
• args object Arguments (optional, default {})
  • args.account string? The Telos account associated to ETH address
  • args.sender string? The ETH address sending the TX
  • args.to string? The ETH address sending the transaction (nonce is fetched on-chain for this address)
  • args.quantity string? The ETH address sending the transaction (nonce is fetched on-chain for this address)
  • args.rawSign boolean? Whether to sign transaction with ethereum private key. False means to use EOSIO authorization

createEthTx

Generates RLP encoded transaction sender parameters

Parameters

• sender The ETH address sending the transaction (nonce is fetched on-chain for this address)
• data The data in transaction
• gasLimit The gas limit of the transaction
• value The value in the transaction
• to The ETH address to send transaction to
• sign Whether to sign the transaction

Returns any RLP encoded transaction

TelosApi

Telos API used as a subset of TelosEvmApi

Parameters

• args object Arguments
  • args.eosPrivateKeysEOSIO Array<string> private keys
  • args.endpointEOSIO Array<string> rpc endpoint
  • args.eosContractEOSIO Array<string> contract name with EVM

transact

Bundles actions into a transaction to send to Telos Api

Parameters

• actions
• actionsFull Array<any> EOSIO actions

Returns Promise<any> EVM receipt and Telos receipt

raw

Sends a ETH TX to EVM

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.txRaw string RLP encoded hex string
  • args.senderThe string ETH address of an account if tx is not signed

Returns Promise<EvmResponse> EVM receipt and Telos receipt

call

Sends a non state modifying call to EVM

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.txRaw string RLP encoded hex string
  • args.senderThe string ETH address of an account if tx is not signed

Returns Promise<string> Hex encoded output

create

Creates EVM address from Telos account

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.data string Arbitrary string used as salt to generate new address

Returns Promise<any> EOSIO TX Response

withdraw

Withdraws token from EVM

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.quantity string EOSIO asset type quantity to withdraw (0.0001 EOS)

Returns Promise<any> EOSIO TX Response

deposit

Deposits token into EVM

Parameters

• args object Arguments
  • args.fromEOSIO string account to interact with EVM
  • args.quantity string EOSIO asset type quantity to deposit (0.0001 EOS)
  • args.memo string Memo to transfer

Returns Promise<any> EOSIO TX Response

clearAll

Testing: Clears all data in contract

Returns Promise<any> TelosTX response

getTable

Fetches tables based on data

Parameters

• data

Returns Promise<any> TelosRPC Get tables row response

getAllAddresses

Gets all accounts

Parameters

• contract The Telos contract with EVM deplyoed

Returns Promise<Array<Account>> all accounts

getEthAccount

Gets the on-chain account

Parameters

• address The ETH address in contract
• contract The Telos contract with EVM deplyoed

Returns Promise<Account> Account row associated with address

getNonce

Gets nonce for given address

Parameters

• address The ETH address in contract
• contract The Telos contract with EVM deplyoed

Returns any Hex-encoded nonce

getNonce

Fetches the nonce for an account

Parameters

• address The ETH address in EVM contract

Returns Promise<string> Hex encoded nonce

getStorageAt

Fetches the on-chain storage value at address and key

Parameters

• address The ETH address in EVM contract
• key Storage key

Returns Promise<AccountState> account state row containing key and value

getEthAccountByEosAccount

Gets the on-chain evm account by eosio account name

Parameters

• account The Telos contract linked to ETH address

Returns Promise<Account>

setupEvmContract

Deploy EVM contract to Telos account

Parameters

• contractDir The directory which contains the ABI and WASM
• contract The Telos contract to deploy EVM to

TelosApi

transact

Bundles actions into a transaction to send to Telos Api

Parameters

• actions
• actionsFull Array<any> EOSIO actions

Returns Promise<any> EVM receipt and Telos receipt

raw

Sends a ETH TX to EVM

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.txRaw string RLP encoded hex string
  • args.senderThe string ETH address of an account if tx is not signed

Returns Promise<EvmResponse> EVM receipt and Telos receipt

call

Sends a non state modifying call to EVM

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.txRaw string RLP encoded hex string
  • args.senderThe string ETH address of an account if tx is not signed

Returns Promise<string> Hex encoded output

create

Creates EVM address from Telosaccount

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.data string Arbitrary string used as salt to generate new address

Returns Promise<any> EOSIO TX Response

withdraw

Withdraws token from EVM

Parameters

• args object Arguments
  • args.accountEOSIO string account to interact with EVM
  • args.quantity string EOSIO asset type quantity to withdraw (0.0001 TLOS)

Returns Promise<any> EOSIO TX Response

deposit

Deposits token into EVM

Parameters

• args object Arguments
  • args.fromEOSIO string account to interact with EVM
  • args.quantity string EOSIO asset type quantity to deposit (0.0001 EOS)
  • args.memo string Memo to transfer

Returns Promise<any> EOSIO TX Response

clearAll

Testing: Clears all data in contract

Returns Promise<any> TelosTX response

getTable

Fetches tables based on data

Parameters

• data

Returns Promise<any> TelosRPC Get tables row response

getAllAddresses

Gets all accounts

Parameters

• contract The Teloscontract with EVM deplyoed

Returns Promise<Array<Account>> all accounts

getEthAccount

Gets the on-chain account

Parameters

• address The ETH address in contract
• contract The Teloscontract with EVM deplyoed

Returns Promise<Account> Account row associated with address

getNonce

Gets nonce for given address

Parameters

• address The ETH address in contract
• contract The Teloscontract with EVM deplyoed

Returns any Hex-encoded nonce

getNonce

Fetches the nonce for an account

Parameters

• address The ETH address in EVM contract

Returns Promise<string> Hex encoded nonce

getStorageAt

Fetches the on-chain storage value at address and key

Parameters

• address The ETH address in EVM contract
• key Storage key

Returns Promise<AccountState> account state row containing key and value

getEthAccountByEosAccount

Gets the on-chain evm account by eos account name

Parameters

• account The Telos contract linked to ETH address

Returns Promise<Account>

setupEvmContract

Deploy EVM contract to Telos account

Parameters

• contractDir The directory which contains the ABI and WASM
• contract The Telos contract to deploy EVM to