Questions tagged [eth-call]
The eth-call tag has no usage guidance.
28
questions
0
votes
1answer
19 views
Race conditions in brownie, how to guarantee this will execute in order?
Let's say I have a contract like this:
contract Test{
uint8 test = 0;
// getter and setter
}
and I want to issue it using some python code like:
initial = contract.getTest()
contract.setTest(1, {&...
0
votes
0answers
6 views
Will be transaction success?
Can call() function be success in if statement? I mean, will tokens be transferred or its just a condition checking, and no any transfer will be in fact?
if(msg.sender.call.value(_am)())
{
acc....
0
votes
0answers
34 views
Calling a non-payable function that mutates state? (web3)
With web3, you can call read-only functions using 'call()' (eg, balanceOf), and functions that mutate state with 'send({from: adr, value: 10})'
I'm able to call payable and non-payable functions fine, ...
1
vote
0answers
40 views
eth_call for nameExpires(uint256 id)
Can someone please explain how I can build the eth_call data param for Registrar nameExpires(uint256 id)
the signature is this: 0xd6e4fa86
The function takes id of label, the namehash. BUT i dont ...
0
votes
0answers
8 views
Can/will a Serenity smart contract be able to cover gas fees?
Vitalik Buterin first expressed here the concept that Serenity contracts would cover a contract-pays instead of a user-pays option. There is also this relevant Improvement Proposal, but I have failed ...
0
votes
1answer
30 views
Transfer ether between two addressrd using call
I have this code:
function regAgent(uint[] memory _preferences) notOwner onlyBeforeEnd public {
require(msg.sender.balance - fee >= 0, "You can't pay the fee.");
require(!...
1
vote
1answer
93 views
Custom bytecode logs data but doesn't return it on eth_call, why not?
I'm creating custom bytecode for a project
0x4160005260206000a0
// OP-Codes
// COINBASE
// PUSH1 0x00
// MSTORE
// PUSH1 0x20
// PUSH1 0x20
// LOG0
when the above is created, the transaction receipt ...
0
votes
1answer
129 views
Call function from deployed contract
I have a deployed contract (contract A) which should act as a storage (let's say 0xD7ACd2a9FD159E69Bb102A1ca21C9a3e3A5F771B).
Now from my ERC20 Token contract (contract B), I am calling approve to the ...
3
votes
1answer
66 views
call opcode gas consumption on a non EOA address depends if the addres is "new" or not
I have the following contract, reduced to the minimum for testing reasons:
pragma solidity ^0.6.11;
contract PackedMultiplexer {
function multiTransfer(address _address1, uint _amount1, address ...
2
votes
0answers
483 views
`web3.eth.abi.decodeParameters()` not returning correct values
I call to a method that returns two contract addresses, like this, where method is the method object taken from the ABI (triple-checked that already):
web3.eth.call(
{
from: account,
...
5
votes
2answers
5k 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&...
2
votes
2answers
262 views
Why field `data` in `eth_call` optional?
Based on https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_call
The data is optional, but it also says it contains hash of the method signature.
In what scenario you can send a eth_call without ...
0
votes
1answer
238 views
linking form submission to smart contract
I have a smart contract that sends x ether to an address.
I have an html page that has a form for the address, and the amount to be sent. Theoretically it should interface with the smart contract.
...
0
votes
1answer
111 views
got response data to nonsencical eth_call request. What is that response?
When I call a seemingly nonsensical transaction on mainnet and rinkeby.
ethereum.send('eth_call', [{'from':'0x0000000000000000000000000000000000000000', 'to':'...
1
vote
1answer
764 views
How can I tell if a node I am using is a full archive node?
What is the best way to tell if the node I am is using a full archive node?
One way I know if is to call a contract from the context of an old block, but this requires an RPC call and is not explicit ...
0
votes
2answers
579 views
Infura Json RPC: how to call a function passing parameters?
IMPORTANT
My final goal is receive data via api on a php server and use Infura to call my contract to save the data
Test Situation
having this test contract on rinkeby
contract test008 {
...
0
votes
1answer
183 views
What is the data field in eth_call commands for USDT?
I'm trying to use eth_call to send USDT (TetherToken) from one account to another (Although I know that eth_call just simiulate such transaction). Everything is clear in this regard, just the data ...
0
votes
1answer
356 views
What is the ethersjs equivalent of `web3.eth.call` in web3js?
web3.js has the ability to call a transaction and get return data without sending a transaction:
web3.eth.call(callObject [, defaultBlock] [, callback])
ethersjs apparently does not have this ...
0
votes
1answer
33 views
call: Alternative transfer at the byte code level
I am reading the following stuff from the research paper at:
Restricted Transfer
We define a property that guarantees that ether transfers (via call)
cannot be invoked by any user a. Violation of ...
1
vote
1answer
517 views
web3py - Function Call when Sender Must Be Certain Address
I have a contract on Ropsten, and when I do this is python, I get a result:
result = contract.functions.getLastUpdateTime(0).call()
So I know the ABI is there, the address, etc.
There's another ...
4
votes
1answer
41 views
Why does the `DoCall` function use the first account by default?
In this line,
// Set sender address or use a default if none specified
var addr common.Address
if args.From == nil {
if wallets := b.AccountManager().Wallets(); len(wallets) > ...
0
votes
0answers
424 views
Get Array from a call in Web3j
I have a solidity function that returns an array.
I'm trying to read the values inside this array from web3j but it gives me stage results.
My solidity function
function getAllSubTokenByTokenID(...
0
votes
1answer
88 views
How to understand from web3py if I need a transaction or a call
I have a contract with a function in which only if a certain condition is true, it changes the state of the blockchain otherwise it emits an event and returns:
address[] public global_state;
function ...
2
votes
2answers
429 views
Call a view function of an Ethereum Smart Contract using a program written in C
my attempt is to call a view function to reatrieve some data from a contract on the Blockchain using a C program. I do have the interface of the contract.
I think i need to performe two things in ...
1
vote
2answers
3k views
Can I get the return value of a .call from a contract from the Blockchain?
I know that if I use call from a contract, that I cannot get the return value. I get a true or a false.
Is it possible for me to inspect the blockchain afterwords to get the return value?
For ...
2
votes
1answer
2k views
Why does this throw a stack underflow error?
Simple contract, one function.
function getSha256(uint32 nonce) returns (bytes32 hash) {
return sha256(nonce);
}
> contractInstance.getSha256.call(1);
Error: Error: VM Exception while ...
2
votes
1answer
1k views
What happens when you use multiple "call" arguments?
I have a piece of code like so:
address x=0x01234..;
x.call(data1, data2, data3);
Will this do what I expect and call the contract at address x while passing the data in concatenated like data1+...
2
votes
0answers
1k views
eth_call using INFURA
I've developed a very simple smart contract and I'm trying to invoke a function using eth_call. The contract is deployed on the revived Ropsten testnet.
If I invoke the function getSTR() sending the ...
