javascript — Ethereum smartcontract автоматические транзакции — возможно ли это?

Я только что сделал smartcontract для ICO, и теперь мне нужно реализовать следующие функции:

1. Пользователь отправил сумму ETH на кошелек

2. Пользователь получает некоторое количество токенов на свой кошелек в обмен на отправленные ETH

Я довольно новичок во всем этом, поэтому я хочу знать — возможно ли это сделать? автоматически (или только в ручном режиме?), если не с самим smartcontract, может быть, есть другой способ сделать это, например, получать события и вызывать функции из smartcontract с помощью какого-то API, например, из PHP или JS?
Если это возможно, когда я могу найти информацию об этом?
Нашел только несколько вопросов, подобных этому, но ответов нет.

Вот код договора (взят в основном из Вот):

pragma solidity ^0.4.2;
contract owned {
address public owner;

function owned() {
owner = msg.sender;
}

modifier onlyOwner {
if (msg.sender != owner) return;
_;
}

function transferOwnership(address newOwner) onlyOwner {
owner = newOwner;
}
}

contract tokenRecipient { function receiveApproval(address _from, uint256
_value, address _token, bytes _extraData); }

contract token {
/* Public variables of the token */
string public standard = 'Token 0.1';
string public name;
string public symbol;
uint8 public decimals;
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);

/* Initializes contract with initial supply tokens to the creator of the
contract */
function token(
uint256 initialSupply,
string tokenName,
uint8 decimalUnits,
string tokenSymbol
) {
balanceOf[msg.sender] = initialSupply;              // Give the creator
all initial tokens
totalSupply = initialSupply;                        // Update total
supply
name = tokenName;                                   // Set the name for
display purposes
symbol = tokenSymbol;                               // Set the symbol
for display purposes
decimals = decimalUnits;                            // Amount of
decimals for display purposes
}

/* Send coins */
function transfer(address _to, uint256 _value) {
if (balanceOf[msg.sender] < _value) return;           // Check if the
sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) return; // Check for
overflows
balanceOf[msg.sender] -= _value;                     // Subtract from
the sender
balanceOf[_to] += _value;                            // Add the same to
the recipient
Transfer(msg.sender, _to, _value);                   // Notify anyone
listening that this transfer took place
}

/* Allow another contract to spend some tokens in your behalf */
function approve(address _spender, uint256 _value)
returns (bool success) {
allowance[msg.sender][_spender] = _value;
return true;
}

/* Approve and then communicate the approved contract in a single tx */
function approveAndCall(address _spender, uint256 _value, bytes _extraData)
returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}

/* A contract attempts to get the coins */
function transferFrom(address _from, address _to, uint256 _value) returns
(bool success) {
if (balanceOf[_from] < _value) return;                 // Check if the
sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) return;  // Check for
overflows
if (_value > allowance[_from][msg.sender]) return;   // Check allowance
balanceOf[_from] -= _value;                          // Subtract from
the sender
balanceOf[_to] += _value;                            // Add the same to
the recipient
allowance[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
}

/* This unnamed function is called whenever someone tries to send ether to
it */
function () {
return;     // Prevents accidental sending of ether
}
}

contract MyAdvancedToken is owned, token {

uint256 public sellPrice;
uint256 public buyPrice;

mapping (address => bool) public frozenAccount;

/* This generates a public event on the blockchain that will notify clients
*/
event FrozenFunds(address target, bool frozen);

/* Initializes contract with initial supply tokens to the creator of the
contract */
function MyAdvancedToken(
uint256 initialSupply,
string tokenName,
uint8 decimalUnits,
string tokenSymbol
) token (initialSupply, tokenName, decimalUnits, tokenSymbol) {}

/* Send coins */
function transfer(address _to, uint256 _value) {
if (balanceOf[msg.sender] < _value) return;           // Check if the
sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) return; // Check for
overflows
if (frozenAccount[msg.sender]) return;                // Check if frozen
balanceOf[msg.sender] -= _value;                     // Subtract from
the sender
balanceOf[_to] += _value;                            // Add the same to
the recipient
Transfer(msg.sender, _to, _value);                   // Notify anyone
listening that this transfer took place
}/* A contract attempts to get the coins */
function transferFrom(address _from, address _to, uint256 _value) returns
(bool success) {
if (frozenAccount[_from]) return;                        // Check if
frozen
if (balanceOf[_from] < _value) return;                 // Check if the
sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) return;  // Check for
overflows
if (_value > allowance[_from][msg.sender]) return;   // Check allowance
balanceOf[_from] -= _value;                          // Subtract from
the sender
balanceOf[_to] += _value;                            // Add the same to
the recipient
allowance[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
}

function mintToken(address target, uint256 mintedAmount) onlyOwner {
balanceOf[target] += mintedAmount;
totalSupply += mintedAmount;
Transfer(0, this, mintedAmount);
Transfer(this, target, mintedAmount);
}

function freezeAccount(address target, bool freeze) onlyOwner {
frozenAccount[target] = freeze;
FrozenFunds(target, freeze);
}

function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner {
sellPrice = newSellPrice;
buyPrice = newBuyPrice;
}

function buy() payable {
uint amount = msg.value / buyPrice;                // calculates the
amount
if (balanceOf[this] < amount) return;               // checks if it has
enough to sell
balanceOf[msg.sender] += amount;                   // adds the amount to
buyer's balance
balanceOf[this] -= amount;                         // subtracts amount
from seller's balance
Transfer(this, msg.sender, amount);                // execute an event
reflecting the change
}

function sell(uint256 amount) {
if (balanceOf[msg.sender] < amount ) return;        // checks if the
sender has enough to sell
balanceOf[this] += amount;                         // adds the amount to
owner's balance
balanceOf[msg.sender] -= amount;                   // subtracts the
amount from seller's balance
if (!msg.sender.send(amount * sellPrice)) {        // sends ether to the
seller. It's important
return;                                         // to do this last
to avoid recursion attacks
} else {
Transfer(msg.sender, this, amount);            // executes an event
reflecting on the change
}
}
}

Извините за мою возможную глупость и плохой английский 🙂

Большое спасибо.