All Questions
Tagged with delegatecall proxy-contracts
23 questions
0
votes
1
answer
58
views
Reason for Checking `msg.sender == _msgSender()` in OpenZeppelin's MulticallUpgradeable Contract
In the OpenZeppelin::MulticallUpgradeable contract, there's a validation that checks msg.sender == _msgSender(). Considering that msg.sender and _msgSender() typically return the same value, why is ...
0
votes
0
answers
14
views
Can a contract call a proxy via delegatecall in a function?
I suppose this is not possible as the proxy contract code would try to retrieve the implementation code from the original contract storage.
- 41
0
votes
1
answer
109
views
Determining if a smart contract is using delegatecall
Let's say that I have the bytecode of a smart contract deployed on ethereum (which I got with a call to eth_getCode).
How can I programmatically determine if this smart contract uses delegatecall ...
- 155
2
votes
2
answers
147
views
Solidity Proxy: why using initialiser instead of a constructor?
Why proxies can't read from the constructor?
- 255
2
votes
0
answers
558
views
How to interact with proxy contract with ethers and wagmi
I have an upgradable proxy contract that points to a specific contract. This is the contract in mumbai polygonscan => https://mumbai.polygonscan.com/address/...
- 21
2
votes
4
answers
1k
views
How can I create a Factory of TransparentUpgradeableProxy?
I have the following code for a Factory that creates instances of a contract that is Upgradeable. I understand that, in order to achieve this, one of the options I have is to use ...
- 845
3
votes
1
answer
390
views
Delegatecall not working
I have deployed the following smart contract: 0x016d87b8c98e6ad0991d128CddA435FAfbC06792
//SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
contract Proxy {
uint256 public count;
address ...
- 1,227
1
vote
2
answers
2k
views
Fastest way to find the function in a contract from it's selector?
Let's say I have a function selector:
0xa9059cbb
And I have a contract as such:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
contract CallAnything {
function balanceOf(address ...
- 12.4k
1
vote
1
answer
382
views
Contract A delegatecall function in contract B which calls function in contract c. msg.sender for function in contract c?
If Function in contract A delegatecall function in contract B which calls function in contract C. What will be the msg.sender for function in contract C?
- 11
1
vote
2
answers
3k
views
How to use Proxies in Ethers?
I'm trying to use Proxies in Ethers.
My Solidity file:
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy....
- 103
1
vote
1
answer
1k
views
Delegatecall failing
I have this second-layer delegatecall (delegatecall on a contract that already did delegatecall) that continues to fail even after checking all the main reasons why it could fail (storage layout, uint ...
- 948
1
vote
0
answers
654
views
Does a proxy contract need to declare state variables?
There is no variable declaration in the proxy contract. Does the returned data from the delegate call auto-generate the variables for the proxy contract?
contract Logic {
uint256 varA;
...
- 11
2
votes
1
answer
715
views
Struct on delegatecall
Is it possible to pass a struct as an argument to delegatecall ?
I have this function that calls delegatecall and takes a struct (a 0x quote) as an argument which is later used on the function ...
- 948
3
votes
2
answers
846
views
Call fallback function from eth-brownie from proxy
I have a contract that has a fallback function to delegatecall all function calls to a different contract. I can't seem to use my typical API to interact with the contract it delegates a call to.
I ...
- 12.4k
2
votes
1
answer
182
views
Preserve msg.sender but not storage
In this particular scheme, we pass the address of the Attacker contract in Victim.foo.
By using delegatecall, we maintain the msg.sender field, but we are not using the storage of Storage but Attacker'...
- 2,641
10
votes
2
answers
3k
views
What is the value of "address(this)" when delegate calling?
Suppose that you have an upgradeable proxy "Foo" that calls an implementation contract "Bar" via DELEGATECALL.
In "Bar", there is a function that uses the Solidity syntax ...
- 18.7k
1
vote
1
answer
845
views
Dynamic Delegate Proxy contract
I'm familiar with proxy contracts in solidity using the 'delegatecall' to separate out the proxy contract from the logic contract. Is there a simple way to choose the logic contract based on an ...
- 640
0
votes
1
answer
209
views
Upgradable contract proxy pattern: Get the invoked method name in the fallback function
I have a proxy smart contract and I would like to get the name of the called method in the fallback function. Is there a way?
For example, if I call the function getName() (stored in the logic ...
- 187
0
votes
1
answer
150
views
How do you pause a Proxy-Logic pattern?
Suppose we have a Proxy contract that forwards to call to a Logic contract by using delegatecall.
If we pause the Proxy, users will still be able to directly interact with the Logic contract. While ...
- 169
0
votes
1
answer
155
views
Unstructured storage proxies. Variables not being overwritten?
When using delegate call I was under the impression that storage slots declared in the proxy will be overwritten by the implementation.
Unstructured storage implementations declare bytes32 variables ...
- 609
2
votes
0
answers
564
views
Proxy contract DELEGATECALL to pass a DYNAMIC array to a function in the target contract
I'm trying to get a Proxy contract to correctly do a delegatecall to a function in another 'target' contract. The problem is, that I need to pass a dynamic array as the parameter to this function.
Q: ...
0
votes
1
answer
451
views
Proxy Contract Not Updating Store Data
I want to setup a proxy contract that my users can interact with. The proxy contract is a store contract with stores the user's age for now. When I call writeData to update my age, I expect it to call ...
- 135
0
votes
1
answer
534
views
Upradeable proxy library throws on any function, how to connect proxy and maincontract
I'm trying to implement a proxy library through the techniques researched by openZeppelin using proxies.
I have 4 contracts
1. Library with logic
2. Library containing the interface for the logic
...
- 994