He configurado una cadena de bloques ethereum privada en 3 nodos diferentes.
Luego implementé el siguiente contrato TokenERC20 estándar en blockchain usando la billetera ethereum:
pragma solidity ^0.4.16;
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }
contract TokenERC20 {
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals = 18;
// 18 decimals is the strongly suggested default, avoid changing it
uint256 public totalSupply;
// This creates an array with all balances
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
// This generates a public event on the blockchain that will notify clients
event Transfer(address indexed from, address indexed to, uint256 value);
// This notifies clients about the amount burnt
event Burn(address indexed from, uint256 value);
/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
function TokenERC20(
uint256 initialSupply,
string tokenName,
string tokenSymbol
) public {
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens
name = tokenName; // Set the name for display purposes
symbol = tokenSymbol; // Set the symbol for display purposes
}
/**
* Internal transfer, only can be called by this contract
*/
function _transfer(address _from, address _to, uint _value) internal {
// Prevent transfer to 0x0 address. Use burn() instead
require(_to != 0x0);
// Check if the sender has enough
require(balanceOf[_from] >= _value);
// Check for overflows
require(balanceOf[_to] + _value > balanceOf[_to]);
// Save this for an assertion in the future
uint previousBalances = balanceOf[_from] + balanceOf[_to];
// Subtract from the sender
balanceOf[_from] -= _value;
// Add the same to the recipient
balanceOf[_to] += _value;
Transfer(_from, _to, _value);
// Asserts are used to use static analysis to find bugs in your code. They should never fail
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}
/**
* Transfer tokens
*
* Send `_value` tokens to `_to` from your account
*
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transfer(address _to, uint256 _value) public {
_transfer(msg.sender, _to, _value);
}
/**
* Transfer tokens from other address
*
* Send `_value` tokens to `_to` in behalf of `_from`
*
* @param _from The address of the sender
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
require(_value <= allowance[_from][msg.sender]); // Check allowance
allowance[_from][msg.sender] -= _value;
_transfer(_from, _to, _value);
return true;
}
/**
* Set allowance for other address
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
*/
function approve(address _spender, uint256 _value) public
returns (bool success) {
allowance[msg.sender][_spender] = _value;
return true;
}
/**
* Set allowance for other address and notify
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
* @param _extraData some extra information to send to the approved contract
*/
function approveAndCall(address _spender, uint256 _value, bytes _extraData)
public
returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
/**
* Destroy tokens
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value); // Check if the sender has enough
balanceOf[msg.sender] -= _value; // Subtract from the sender
totalSupply -= _value; // Updates totalSupply
Burn(msg.sender, _value);
return true;
}
/**
* Destroy tokens from other account
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) public returns (bool success) {
require(balanceOf[_from] >= _value); // Check if the targeted balance is enough
require(_value <= allowance[_from][msg.sender]); // Check allowance
balanceOf[_from] -= _value; // Subtract from the targeted balance
allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance
totalSupply -= _value; // Update totalSupply
Burn(_from, _value);
return true;
}
}
Luego, en una consola geth, sincronicé este contrato usando:
var abi = contractInterface //i gave actual interface here
var address = contractAddress //i gave actual address where contract is deployed
var adder1 = eth.contract(abi).at(address)
Luego, la impresión adder1
en la consola geth muestra:
> adder1
{
abi: [{
constant: true,
inputs: [],
name: "name",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
constant: false,
inputs: [{...}, {...}],
name: "approve",
outputs: [{...}],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
constant: true,
inputs: [],
name: "totalSupply",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
constant: false,
inputs: [{...}, {...}, {...}],
name: "transferFrom",
outputs: [{...}],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
constant: true,
inputs: [],
name: "decimals",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
constant: false,
inputs: [{...}],
name: "burn",
outputs: [{...}],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
constant: true,
inputs: [{...}],
name: "balanceOf",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
constant: false,
inputs: [{...}, {...}],
name: "burnFrom",
outputs: [{...}],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
constant: true,
inputs: [],
name: "symbol",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
constant: false,
inputs: [{...}, {...}],
name: "transfer",
outputs: [],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
constant: false,
inputs: [{...}, {...}, {...}],
name: "approveAndCall",
outputs: [{...}],
payable: false,
stateMutability: "nonpayable",
type: "function"
}, {
constant: true,
inputs: [{...}, {...}],
name: "allowance",
outputs: [{...}],
payable: false,
stateMutability: "view",
type: "function"
}, {
inputs: [{...}, {...}, {...}],
payable: false,
stateMutability: "nonpayable",
type: "constructor"
}, {
anonymous: false,
inputs: [{...}, {...}, {...}],
name: "Transfer",
type: "event"
}, {
anonymous: false,
inputs: [{...}, {...}],
name: "Burn",
type: "event"
}],
address: "0xA8113a44aCC20305ce9f2Cd7CC067562b8f54d6c",
transactionHash: null,
Burn: function(),
Transfer: function(),
allEvents: function(),
allowance: function(),
approve: function(),
approveAndCall: function(),
balanceOf: function(),
burn: function(),
burnFrom: function(),
decimals: function(),
name: function(),
symbol: function(),
totalSupply: function(),
transfer: function(),
transferFrom: function()
}
Hasta aquí todo parece estar funcionando bien. Ahora, cuando trato de usar la función de transferencia de la siguiente manera:
adder1.transfer("0x542b2103c2cf18ce6e22d5099bee3db32e984641",33000000000000000000)
Me da error:
Error: invalid address
at web3.js:3930:15
at web3.js:3756:20
at web3.js:5025:28
at map (<native code>)
at web3.js:5024:12
at web3.js:5050:18
at web3.js:5075:23
at web3.js:4137:16
at apply (<native code>)
at web3.js:4223:16
o incluso si lo hago:
adder1.transferFrom(eth.accounts[0],"0x542b2103c2cf18ce6e22d5099bee3db32e984641",33000000000000000000)
me sale error:
Error: invalid address
at web3.js:3930:15
at web3.js:3756:20
at web3.js:5025:28
at map (<native code>)
at web3.js:5024:12
at web3.js:5050:18
at web3.js:5075:23
at web3.js:4137:16
at apply (<native code>)
at web3.js:4223:16
Ni siquiera da ninguna pista para la depuración.
Pregunta: ¿Puede alguien ayudarme a enviar éteres o tokens utilizando el contrato implementado anteriormente desde la terminal?
Para su información, se TokenERC20
puede encontrar aquí: [ https://www.ethereum.org/token][1]
Cualquier ayuda o mejor comprensión en este contexto es bienvenida.
He pasado horas en esto, pero no pude hacer nada.
Yo mismo encontré una respuesta funcional:
Consulte esto: ¿Cómo transfiero tokens ERC20 (GNT, OMG, etc.) de una billetera fría a otra cuenta (o intercambio) usando geth?
Y esto es lo que hice:
var abi = contractInterface
var address = contractAddress
var adder1 = eth.contract(abi).at(address)
var fromAccount = "0x7a52a05a2a2f3c9ed8b1297db5399c0c3adfa5c2".toLowerCase()
var destAccount = "0x542b2103c2cf18ce6e22d5099bee3db32e984641".toLowerCase()
adder1.transfer(destAccount,web3.toWei(20,"ether"),{from:fromAccount})