Questions tagged [revert-opcode]

Questions about Solidity's `revert()` or the REVERT opcode.

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abi.decode with pragma experimental ABIEncoderV2 reverts with nested array

I have a function with a parameter of bytes calldata that needs to be decoded to a struct, but the call reverts in assembly. I believe the issue has something to do with the nested array. I have ...
3
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2answers
212 views

Gas refunds via “Self-destruct” prior to a revert()

In a transaction that eventually calls revert(), if prior to the revert we have SELFDESTRUCT some contracts and thus received a gas refund, does the gas refund also get reverted?
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1answer
38 views

How to get require() error message?

I can see the error message on Etherscan. But I can't find it in getTransactionRecept(). Is there any special settings that I need set in my Genesis.json before I can see it?
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40 views

UnhandledPromiseRejectionWarning: Error: nonce generation function failed or private key is invalid in Ganache

In Go I am using go-ethereum to read data from the ethereum smart contract. My smart contract is maintained with truffle. I am trying to fetch candidate information based on candidate id. I have a ...
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19 views

Is there a way to get revert message by my client?

I have a smart contract with this simple function: function addUser( string memory _username, string memory _nome, string memory _cognome, string memory _email) public isOwner() { require(bytes(...
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2answers
260 views

How to get reason revert using web3.eth.call

I have a smart contract with required message and pretend to use the required/validation message in front end. require(bytes(hashAlreadyRegistered[hash]).length == 0, "Hash already registered&...
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21 views

Is there a way to know if a Solidity method will revert?

I have some solidity methods in my contract, and when i make a send in web3.js i would like to know if there is a way to know if the functions are going to revert by using call. Per-example , in ...
2
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1answer
20 views

What is the purpose of a `// dev:` comment after a revert or require statement?

What does it mean when a Solidity contract includes a comment starting with // dev: after a revert or require statement? For example: contract Example { function greet(){ revert(); // ...
5
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1answer
66 views

How to catch a `revert()` error using Brownie?

I am using Brownie to develop my smart contracts, which helps me to intract with the smart contracts, please see doc. When my call Example.greet() is there any way to return the error message and act ...
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1answer
143 views

While testing wrap & unwrap of ETH to WETH on Kovan ,however the wrap function is fine but unwrap func fails,is anything wrong in my approach?

trx fails at & debug at tenderly pragma solidity 0.5.12; contract WETH9_ { mapping (address => uint) public balanceOf; mapping (address => mapping (address => ...
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2answers
171 views

How can I get the revert reason of a call in Solidity so that I can use it in the same on-chain transaction?

I want to get the revert reason of a failed call and then use that revert reason in the same on-chain transaction. Is this possible?
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0answers
37 views

How can I debug EventLog in Solidity code? Multisig execution failure when executing multisend function

I'm trying to execute a multitransfer (ERC20token) transaction using a multisig contract. The multitransfer got executed successfully when the value of the token is 0, however it always fail (reverted)...
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1answer
87 views

On Etherscan, what is the difference between a failed transaction that says 'Reverted' and one that says 'Execution Reverted'?

On Etherscan, a failed transaction will provide a reason for failure. This can be Reverted, Out of Gas, Bad instruction, etc. However, there seems to be an inconsistent message on different testnets. ...
2
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0answers
45 views

How to know the reason of transaction's reversion in parity?

I am testing ERC20 USDT contract locally with parity. I imported contract to my private testnet and manually generated raw transaction that calls "transfer" method of contract. I send it to the node ...
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1answer
81 views

Transfer ERC20 Token - Encountered during contract execution [Reverted]

When trying to sent some ERC20 Token from wallet getting following error: Warning! Error encountered during contract execution [Reverted] This error returned when i call transferFrom()( I made ...
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1answer
38 views

Payable constructor gives revert message

I am trying to execute the following contract on remixe IDE: pragma solidity ^0.5.4; contract GuessTheNumberChallenge { constructor() public payable { require(msg.value == 1 ether); } ...
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2answers
365 views

How to diagnose a “Error: Transaction has been reverted by the EVM”?

This the error intercepted from my javascript, using web3.js Error: Transaction has been reverted by the EVM: { "blockHash": "...
5
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1answer
765 views

Is it possible to perform a try-catch in Solidity?

Does Solidity support try-catch functionality? If so, how does it work? What are the limitations?
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1answer
30 views

Trying to get array size but it reverts

I wanted to get array length by getter function, but it keeps reverts. But I have no idea why it's reverting. Here is my code. struct ItemAddress { uint8 sendNatCd; uint8 rcvNatCd; uint16 ...
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2answers
109 views

Does reverted transactions considered as mined transactions?

I want to know if a reverted transaction is considered as mined one ? this is mean nonce should be incremented
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2answers
113 views

How to decode error response from contact

When calling a contract function that I expect to fail by invoking revert, I receive the following JSON-RPC response: { "jsonrpc": "2.0", "id": 1, "result": "...
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0answers
28 views

Cann't send token with looping function

Sorry, I'm a newbie on ERC721 token. Please help. I have deployed ERC721 contract in the localhost testnet. I use looping function for mint token and it works. But when I use looping function for ...
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0answers
37 views

How do I check transaction status using go-ethereum simulated back-end?

Using the go-ethereum simulated backend, I would like to: 1) Instantly commit a transaction so that it either succeeds or reverts in a given simulated blockchain. So far I'm using sim.Commit() to ...
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36 views

Revert() workflow in re-entrancy vulnerablity?

I am studying the following code contract Mutex { bool locked; modifier noReentrancy() { require(!locked); locked = true; _; locked = false; } function f(unit256 amount) public ...
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2answers
432 views

forward revert message from low level solidity call

I'm working on a proxy contract that will perform calls as follows: bool success; bytes memory returndata; (success, returndata) = _to.call.value(_value)(_data); require(success); this works great, ...
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0answers
33 views

Assert after critical instruction

I've seen a particular code style, where after any "critical" state modification operation, a check is done in order to assess the true good result of the operation. Something like: uint _count = ...
2
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1answer
198 views

How to handle require/revert/assert errors properly

I'm trying to find an easy pattern to revert/rollback a write transaction. The first idea was to log a GenericErrorEvent but then I noticed that it will never be emited if any require/revert/assert ...
1
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1answer
77 views

why use up all the gasLimit when use assembly and revert together?

try to call erc20 token's transferFrom() using assembly(to save some gas), code like this: pragma solidity ^0.4.24; contract TestAssemblyAndRevert { function test(address from, address to, ...
2
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1answer
110 views

Ether in ERC-20 transactions?

I have one contract that I give tokens from a ERC20 contract implemantation. When I call the balanceOf function from the Token conract. Response me that I have x Tokens. Nice !! But when I try to ...
4
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3answers
635 views

Is there a way to capture the require / revert failure reason?

In my contract, I have a bunch of checking at the start of a public function. It looks something like this: require ( prx < 1e18, "Value prx too high") require ( prx != 0, "Value prx cannot be ...
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2answers
179 views

Does a string message increase the gas usage of a `require` statement?

In solc 0.4.22 onward, it is possible to provide a string message containing details about the error that will be passed back to the caller (in require, assert and revert statements). Does the gas ...
2
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1answer
316 views

Recently upgraded Solc and Web3. Transactions with zero addresses now reverting with “invalid address” message?

I recently upgraded Web3JS and Solc. Now every time I pass a zero address to a Solidity contact method the transaction reverts with an "invalid address" message. This message appears to be coming ...
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3answers
1k views

How to catch solidity contract revert message using web3j

Is there any way to catch solidity revert message like Remix Javascript VM in web3j Revert message(Remix) transact to Erecruitment.issueNewAdmitCard errored: VM error: revert. revert The ...
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1answer
314 views

Is it safe to call revert() instead of returning a value?

I have the following piece of code: function func() public returns (bool) { if (some condition on msg.sender) { do some stuff return true; } revert(); } The compiler (0.4....
4
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1answer
412 views

Getting transaction receipt with a reverted transaction to determine how much gas was used?

In web3.js, if a revert occurs, it doesn't give a receipt along with it. I want to determine how much gas was actually used after a revert. In 1.0, I can't even get the tx hash from the event ...
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2answers
127 views

Require validation error not working

I tried using require method in solidity in the following way: require(validate(personName),"Error: Invalid Person") In this case i am checking if a person is already added to my person list. If not ...
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2answers
114 views

Here is my sample code, whether the contract to contract calls in setName function is synchronous or asynchronous?

pragma solidity ^0.4.22; contract Testing { function setName(bytes32 firstName , bytes32 lastName) public returns(bool) { Sample _test = new Sample(firstName); _test.addLastName(...
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1answer
290 views

Solidity/Remix Error : The constructor should be payable if you send value?

Simple contract, but don't transfer ETH! pragma solidity ^0.4.24; contract Upper { uint public count; constructor() payable public {} function() payable public { count++; } ...
1
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1answer
82 views

Calculating a minimum entry fee for a game based on typical minimum gas requirements?

I am creating a dApp that is a game where players compete for the prize pool and that pool is built from the sum of all the entry fees payed by the player at the start of the game. The player that ...
6
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2answers
2k views

Getting error message from require()

I know that the latest Solidity supports error messages in require/revert (require(stuff, "problem")). Are there any clients that can get this message? Will I be able to see it if I execute the ...
0
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1answer
129 views

Non deterministic gas usage of the same function

Environment Truffle v4.1.8 node 10.0.0 pragma solidity ^0.4.21; Issue I'm calling the claimRefund function on my smart contract using metamask. When calling the function with 37081 gas limit at 20 ...
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2answers
993 views

Smartcontract: Warning! contract execution experienced an error and gets [Reverted]

I have sent ropsten ETH to my newly created contract address (still on test mode on the Ropsten Test net). Unfortunately it kept "failing". The blockchain reports: Warning! Error encountered during ...
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1answer
21 views

.transfer question [duplicate]

How does the transfer function behave? Was looking at a function I created, and saw that we transfer ether out of the contract, before deleting the data which determines whether or not it is allowed ...
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1answer
252 views

Solidity: VM Exception while processing transaction: invalid opcode - What happens?

If VM Exception while processing transaction: invalid opcode is thrown, does it have the same effect than revert?
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2answers
489 views

Unable to transfer ERC20 tokens from a contract

I'm having trouble getting a solidity contract method to transfer ERC20 tokens from address A to B assuming B has called approve outside the contract and setup sufficient allowance for A. The ...
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0answers
442 views

How to catch reverted transaction while using metamask

I'm working with metamask and was testing a transaction that should trigger a revert statement inside my contract. When the error is thrown metamask gives the following output: this was while using ...
22
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3answers
6k views

how to catch “revert” error in truffle test javascript?

How can I catch "revert" error in truffle test written in javascript? Error: VM Exception while processing transaction: revert Here is part of test contract, function doRevert() public { ...
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3answers
980 views

Web3 transaction to a contract fails with revert. Same transaction works from truffle console

I have a simple contract transaction that creates another contract. This transaction when called from Node.js using Web3 and truffle-contract throws a revert. ContractFactory.deployed().then(function(...
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5answers
3k views

How to receive revert() reason for past transactions?

I run a geth/parity nodes for broadcasting user's transactions to Ethereum blockchain. Some of contract functions provide reasons for revert (see examble below): contract Example { function test (...
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1answer
496 views

Can't find a way to log when revert()'ing in remix

This is my first time working with Solidity and I soon ran into an issue. When an address doesn't have enough balance or doesn't have the authority to add coins I want to log an error, when these ...