Events doesn't fire executing transaction with web3 in testrpc

Question

I'm executing the basic token contract found at https://ethereum.org/token:

contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); }
contract MyToken {
    /* 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 =&gt; uint256) public balanceOf;
mapping (address =&gt; mapping (address =&gt; 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 MyToken(
    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] &lt; _value) throw;           // Check if the sender has enough
    if (balanceOf[_to] + _value &lt; balanceOf[_to]) throw; // 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 approveAndCall(address _spender, uint256 _value, bytes _extraData)
    returns (bool success) {
    allowance[msg.sender][_spender] = _value;
    tokenRecipient spender = tokenRecipient(_spender);
    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] &lt; _value) throw;                 // Check if the sender has enough
    if (balanceOf[_to] + _value &lt; balanceOf[_to]) throw;  // Check for overflows
    if (_value &gt; allowance[_from][msg.sender]) throw;   // 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 () {
    throw;     // Prevents accidental sending of ether
}

}

But when I see the log at testrpc or I look at web3.eth.getTransactionReceipt(txHash)I can't see any log or event.

Does anybody know what could I've doing wrong? Any known bug with web3 or testrpc in this topic?

Possible duplicate of contract event not firing in web3 node console — niksmac, Jun 23 '16 at 01:43
How much gas are you providing and what is gasUsed in the receipt? Have you tried increasing the gas and which function are you invoking? — eth, Jun 23 '16 at 04:05
@niksmac that's not a duplicate of my question, I'm watching the good way the events, also looking at testrpc logs and inscpecting the TokenReceipt, and nothing works. — arodriguezdonaire, Jun 23 '16 at 06:32
Please check if your account is unlocked. If your account is locked, the transaction is sent but you do not get a receipt. See http://ethereum.stackexchange.com/questions/4307/why-contracts-cant-be-deployed-on-my-private-chain-using-geth-cli/4309#4309. — BokkyPooBah, Jun 23 '16 at 13:54

score 1 · Answer 1 · answered Jun 29 '16 at 00:08

1

Is any ether being transferred? Is it going through? If so, try making sure the ABI's are correct. If that doesn't fix your problem try using this methodology for monitoring events:

var contract = web3.eth.contract(abi).at(addr);
var transfers = contract.Transfer( {}, {fromBlock: 0, toBlock: 'latest'})

//Watch Events
transfers.watch(function(error, result) {

    //Stuff
});

Can you post your web3 transaction code?

answered Jun 29 '16 at 00:08

babycakes

183
6

This code is very old and gives me the error, "cannot call watch on undefined" – Jim Nov 01 '21 at 19:53

Events doesn't fire executing transaction with web3 in testrpc

1 Answers1