infinite event loop

[JMLX42]

I get this error with testrpc:

"Error: Error: sender doesn't have enough funds to send tx. The upfront cost is: 19999980000000000 and the senders account only has: 19218460000000000
    at runCall (/usr/lib/node_modules/ethereumjs-testrpc/node_modules/ethereumjs-vm/lib/runTx.js:93:10)
    at /usr/lib/node_modules/ethereumjs-testrpc/node_modules/async/lib/async.js:718:13
    at Immediate.iterate [as _onImmediate] (/usr/lib/node_modules/ethereumjs-testrpc/node_modules/async/lib/async.js:262:13)
    at processImmediate [as _immediateCallback] (timers.js:383:17)

First of all, I don't get this error with geth.
But also after this error, an event which is supposed to be emitted at the very end of the smart contract function is emitted in a infinite loop:

{"name":"ballot-queue-worker","hostname":"local.cocorico.cc-local","pid":6571,"level":30,"balance":"19218460000000000","event":{"logIndex":0,"transactionIndex":0,"transactionHash":"0x966daa499879fe93a1c8c43cdb69dec5843166c47f3088d5af76fbb0c4f845c7","blockHash":"0xd6701b9c7eacb014cb2374012b22297e417ea83ae50844fdc0b75982db06d41c","blockNumber":7,"address":"0x01cf04804565c1f45aec92cf94a2a78e239aa231","type":"mined","event":"Ballot","args":{"voter":"0xb4d0b2358bd40fabd1d260eee60871e4c0c0e176","proposal":"0"}},"msg":"ballot event","time":"2016-04-03T20:33:07.479Z","v":0}
{"name":"ballot-queue-worker","hostname":"local.cocorico.cc-local","pid":6571,"level":30,"balance":"19218460000000000","event":{"logIndex":0,"transactionIndex":0,"transactionHash":"0x966daa499879fe93a1c8c43cdb69dec5843166c47f3088d5af76fbb0c4f845c7","blockHash":"0xd6701b9c7eacb014cb2374012b22297e417ea83ae50844fdc0b75982db06d41c","blockNumber":7,"address":"0x01cf04804565c1f45aec92cf94a2a78e239aa231","type":"mined","event":"Ballot","args":{"voter":"0xb4d0b2358bd40fabd1d260eee60871e4c0c0e176","proposal":"0"}},"msg":"ballot event","time":"2016-04-03T20:33:07.653Z","v":0}
{"name":"ballot-queue-worker","hostname":"local.cocorico.cc-local","pid":6571,"level":30,"balance":"19218460000000000","event":{"logIndex":0,"transactionIndex":0,"transactionHash":"0x966daa499879fe93a1c8c43cdb69dec5843166c47f3088d5af76fbb0c4f845c7","blockHash":"0xd6701b9c7eacb014cb2374012b22297e417ea83ae50844fdc0b75982db06d41c","blockNumber":7,"address":"0x01cf04804565c1f45aec92cf94a2a78e239aa231","type":"mined","event":"Ballot","args":{"voter":"0xb4d0b2358bd40fabd1d260eee60871e4c0c0e176","proposal":"0"}},"msg":"ballot event","time":"2016-04-03T20:33:07.837Z","v":0}
{"name":"ballot-queue-worker","hostname":"local.cocorico.cc-local","pid":6571,"level":30,"balance":"19218460000000000","event":{"logIndex":0,"transactionIndex":0,"transactionHash":"0x966daa499879fe93a1c8c43cdb69dec5843166c47f3088d5af76fbb0c4f845c7","blockHash":"0xd6701b9c7eacb014cb2374012b22297e417ea83ae50844fdc0b75982db06d41c","blockNumber":7,"address":"0x01cf04804565c1f45aec92cf94a2a78e239aa231","type":"mined","event":"Ballot","args":{"voter":"0xb4d0b2358bd40fabd1d260eee60871e4c0c0e176","proposal":"0"}},"msg":"ballot event","time":"2016-04-03T20:33:08.118Z","v":0}
...

Since the transaction cannot occur, it would be surprisingly to have this event emitted even once.
But here it's emitted in a loop.

Any idea what's wrong?

Thank you !

[JMLX42]

Calling event.stopWatching() when I get the event I want solves the issue.
Still, that's a weird behavior and it doesn't happen with geth so I think it's worth investigating.

[tcoulter]

First, it's hard to debug when I can't see the code that makes the
transactions, nor the contract code itself.

Second, that error means there's not enough Ether in the address you're
sending from.

I don't have enough information to start debugging, or to assume it isn't
an error on your end. You'll have to provide that before I can do anything
further.
On Apr 3, 2016 1:44 PM, "Jean-Marc Le Roux" notifications@github.com
wrote:

Calling event.stopWatching() when I get the event I want solves the issue.
Still, that's a weird behavior and it doesn't happen with geth so I think
it's worth investigating.

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#56 (comment)

[JMLX42]

Second, that error means there's not enough Ether in the address you're
sending from.

I know that. But why does it happen with testrpc and not geth?

Here is the contract:

contract Vote {

    event Ballot (
        address indexed voter,
        uint8 proposal
    );

    event VoterRegistered (
        address indexed voter
    );

    event VoteError (
        address indexed user,
        string message
    );

    struct Voter {
        bool registered;
        bool voted;
        uint8 vote;
    }
    struct Proposal {
        uint voteCount;
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    // Create a new ballot with $(_numProposals) different proposals.
    function Vote(uint8 _numProposals) {
        chairperson = msg.sender;
        proposals.length = _numProposals;
    }

    modifier onlyChairPerson() {
        if (msg.sender != chairperson)
            throw;
        _
    }

    modifier onlyRegisteredVoter() {
        Voter voter = voters[msg.sender];

        if (voter.voted || !voter.registered)
            throw;
        _
    }

    function registerVoter(address voterAddress) onlyChairPerson {
        Voter voter = voters[voterAddress];

        if (voter.voted || voter.registered)
            throw;

        voter.registered = true;

        VoterRegistered(voterAddress);
    }

    // Give a single vote to proposal $(proposal).
    function vote(uint8 proposal) onlyRegisteredVoter {
        Voter voter = voters[msg.sender];

        if (proposal >= proposals.length)
            return; // FIXME: emit a BallotError event

        voter.voted = true;
        voter.vote = proposal;
        proposals[proposal].voteCount += 1;

        Ballot(msg.sender, proposal);
    }

    function winningProposal() constant returns (uint8 winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 proposal = 0; proposal < proposals.length; proposal++)
            if (proposals[proposal].voteCount > winningVoteCount) {
                winningVoteCount = proposals[proposal].voteCount;
                winningProposal = proposal;
            }
    }

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

[v1v2r0b8]

Here is infinite event emitting loop issue in the very simple situation: http://ethereum.stackexchange.com/questions/2614/event-watch-gets-fired-infinitely-many-times

UPD I tried the very same script with geth and it worked properly, so it is probably a testrpc issue.

[lastperson]

Hi, just stumble upon the same problem, but bug is not that the event got emitted infinitely, bug is that after calling eth_getFilterChanges testrpc reports the events, and forgets that it reported it for current block, so when the next eth_getFilterChanges happens, testrpc reports the same events again, and again, infinitely, until the new transaction(block) happens, then it starts reporting the event from new latest block endlessly.
@tcoulter hope this helps.

[tcoulter]

@kumavis @FlySwatter Have you seen this?

[kumavis]

i have seen this before MetaMask/web3-provider-engine#55
I can investigate

[tcoulter]

Fixed and published in v2.0.3.