A contract with multiple events with the same name throws `decodeParameters` in Truffle

by Hardly Difficult   Last Updated March 18, 2019 21:28 PM


There is an issue open with Truffle, in the meantime is there a work-around or anything else we could try to unblock development? I'm hesitant to start wrapping our tests with try...catch blocks that just ignore the errors.

The issue:

When a contract has an event defined and attempts to make an external call to another contract which emits an event with the same name the Truffle test throws the following error:

Error: Returned values aren't valid, did it run Out of Gas?
    at ABICoder.decodeParameters (node_modules\truffle\build\webpack:\~\web3-eth-abi\src\index.js:226:1)
    at ABICoder.decodeParameter (node_modules\truffle\build\webpack:\~\web3-eth-abi\src\index.js:213:1)
    at node_modules\truffle\build\webpack:\~\web3-eth-abi\src\index.js:274:14
    at Array.forEach (<anonymous>)
    at ABICoder.decodeLog (node_modules\truffle\build\webpack:\~\web3-eth-abi\src\index.js:270:1)
    at node_modules\truffle\build\webpack:\packages\truffle-contract\lib\utils.js:60:1
    at Array.map (<anonymous>)
    at Function.decodeLogs (node_modules\truffle\build\webpack:\packages\truffle-contract\lib\utils.js:44:1)
    at Promise.receipt (node_modules\truffle\build\webpack:\packages\truffle-contract\lib\handlers.js:98:1)
    at Promise.emit (node_modules\truffle\build\webpack:\~\eventemitter3\index.js:89:1)
    at node_modules\truffle\build\webpack:\~\web3-eth\~\web3-core-method\src\index.js:353:1
    at process._tickCallback (internal/process/next_tick.js:68:7)

It seems you can try...catch the error and ignore it. The transaction does process successfully.

More specifically: we are creating a contract with implements ERC721. ERC721 has the following event:

event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);

Our contract then attempts to call transferFrom on an ERC20 token, which emits the following:

event Transfer(address indexed _from, address indexed _to, uint256 _value)

The issue occurs when that Transfer event is emitted.

How to repo:

We created a simple example on GitHub which includes a Travis CI build where you can see the error triggered by the test (in test/Test.js)

Additional context:

Turning off Ganache's auto-mine did not fix the issue. Switching to use the Web3 API to make the call results in the test hanging (instead of throwing an error). There's a bit more detail about these attempts in the example repo.

Also, can we even be sure this is an issue with Truffle vs maybe Ganache?

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