Contract Address Details

0xFe446bEF1DbF7AFE24E81e05BC8B271C1BA9a560

EternalStorageProxy Last Balance Update: Block #15082130
Created by 0x5d14–003ea0 at 0x5313–3c61c4

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0 POA

(@ /POA)

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Contract name:
EternalStorageProxy




Optimization enabled
true
Compiler version
v0.4.24+commit.e67f0147




Optimization runs
200
EVM Version
byzantium

Contract source code

/**
* Submitted for verification at blockscout.com on 2019-07-22 13:07:40.775826Z
*/
// File: contracts/upgradeability/EternalStorage.sol
pragma solidity 0.4.24;
/**
* @title EternalStorage
* @dev This contract holds all the necessary state variables to carry out the storage of any contract.
*/
contract EternalStorage {
mapping(bytes32 => uint256) internal uintStorage;
mapping(bytes32 => string) internal stringStorage;
mapping(bytes32 => address) internal addressStorage;
mapping(bytes32 => bytes) internal bytesStorage;
mapping(bytes32 => bool) internal boolStorage;
mapping(bytes32 => int256) internal intStorage;
}
// File: contracts/upgradeability/Proxy.sol
pragma solidity 0.4.24;
/**
* @title Proxy
* @dev Gives the possibility to delegate any call to a foreign implementation.
*/
contract Proxy {
/**
* @dev Tells the address of the implementation where every call will be delegated.
* @return address of the implementation to which it will be delegated
*/
function implementation() public view returns (address);
/**
* @dev Fallback function allowing to perform a delegatecall to the given implementation.
* This function will return whatever the implementation call returns
*/
function () payable public {
address _impl = implementation();
require(_impl != address(0));
assembly {
/*
0x40 is the "free memory slot", meaning a pointer to next slot of empty memory. mload(0x40)
loads the data in the free memory slot, so `ptr` is a pointer to the next slot of empty
memory. It's needed because we're going to write the return data of delegatecall to the
free memory slot.
*/
let ptr := mload(0x40)
/*
`calldatacopy` is copy calldatasize bytes from calldata
First argument is the destination to which data is copied(ptr)
Second argument specifies the start position of the copied data.
Since calldata is sort of its own unique location in memory,
0 doesn't refer to 0 in memory or 0 in storage - it just refers to the zeroth byte of calldata.
That's always going to be the zeroth byte of the function selector.
Third argument, calldatasize, specifies how much data will be copied.
calldata is naturally calldatasize bytes long (same thing as msg.data.length)
*/
calldatacopy(ptr, 0, calldatasize)
/*
delegatecall params explained:
gas: the amount of gas to provide for the call. `gas` is an Opcode that gives
us the amount of gas still available to execution
_impl: address of the contract to delegate to
ptr: to pass copied data
calldatasize: loads the size of `bytes memory data`, same as msg.data.length
0, 0: These are for the `out` and `outsize` params. Because the output could be dynamic,
these are set to 0, 0 so the output data will not be written to memory. The output
data will be read using `returndatasize` and `returdatacopy` instead.
result: This will be 0 if the call fails and 1 if it succeeds
*/
let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
/*
*/
/*
ptr current points to the value stored at 0x40,
because we assigned it like ptr := mload(0x40).
Because we use 0x40 as a free memory pointer,
we want to make sure that the next time we want to allocate memory,
we aren't overwriting anything important.
So, by adding ptr and returndatasize,
we get a memory location beyond the end of the data we will be copying to ptr.
We place this in at 0x40, and any reads from 0x40 will now read from free memory
*/
mstore(0x40, add(ptr, returndatasize))
/*
`returndatacopy` is an Opcode that copies the last return data to a slot. `ptr` is the
slot it will copy to, 0 means copy from the beginning of the return data, and size is
the amount of data to copy.
`returndatasize` is an Opcode that gives us the size of the last return data. In this case, that is the size of the data returned from delegatecall
*/
returndatacopy(ptr, 0, returndatasize)
/*
if `result` is 0, revert.
if `result` is 1, return `size` amount of data from `ptr`. This is the data that was
copied to `ptr` from the delegatecall return data
*/
switch result
case 0 { revert(ptr, returndatasize) }
default { return(ptr, returndatasize) }
}
}
}
// File: contracts/upgradeability/UpgradeabilityStorage.sol
pragma solidity 0.4.24;
/**
* @title UpgradeabilityStorage
* @dev This contract holds all the necessary state variables to support the upgrade functionality
*/
contract UpgradeabilityStorage {
// Version name of the current implementation
uint256 internal _version;
// Address of the current implementation
address internal _implementation;
/**
* @dev Tells the version name of the current implementation
* @return string representing the name of the current version
*/
function version() external view returns (uint256) {
return _version;
}
/**
* @dev Tells the address of the current implementation
* @return address of the current implementation
*/
function implementation() public view returns (address) {
return _implementation;
}
}
// File: contracts/upgradeability/UpgradeabilityProxy.sol
pragma solidity 0.4.24;
/**
* @title UpgradeabilityProxy
* @dev This contract represents a proxy where the implementation address to which it will delegate can be upgraded
*/
contract UpgradeabilityProxy is Proxy, UpgradeabilityStorage {
/**
* @dev This event will be emitted every time the implementation gets upgraded
* @param version representing the version name of the upgraded implementation
* @param implementation representing the address of the upgraded implementation
*/
event Upgraded(uint256 version, address indexed implementation);
/**
* @dev Upgrades the implementation address
* @param version representing the version name of the new implementation to be set
* @param implementation representing the address of the new implementation to be set
*/
function _upgradeTo(uint256 version, address implementation) internal {
require(_implementation != implementation);
require(version > _version);
_version = version;
_implementation = implementation;
emit Upgraded(version, implementation);
}
}
// File: contracts/upgradeability/UpgradeabilityOwnerStorage.sol
pragma solidity 0.4.24;
/**
* @title UpgradeabilityOwnerStorage
* @dev This contract keeps track of the upgradeability owner
*/
contract UpgradeabilityOwnerStorage {
// Owner of the contract
address internal _upgradeabilityOwner;
/**
* @dev Tells the address of the owner
* @return the address of the owner
*/
function upgradeabilityOwner() public view returns (address) {
return _upgradeabilityOwner;
}
/**
* @dev Sets the address of the owner
*/
function setUpgradeabilityOwner(address newUpgradeabilityOwner) internal {
_upgradeabilityOwner = newUpgradeabilityOwner;
}
}
// File: contracts/upgradeability/OwnedUpgradeabilityProxy.sol
pragma solidity 0.4.24;
/**
* @title OwnedUpgradeabilityProxy
* @dev This contract combines an upgradeability proxy with basic authorization control functionalities
*/
contract OwnedUpgradeabilityProxy is UpgradeabilityOwnerStorage, UpgradeabilityProxy {
/**
* @dev Event to show ownership has been transferred
* @param previousOwner representing the address of the previous owner
* @param newOwner representing the address of the new owner
*/
event ProxyOwnershipTransferred(address previousOwner, address newOwner);
/**
* @dev the constructor sets the original owner of the contract to the sender account.
*/
constructor() public {
setUpgradeabilityOwner(msg.sender);
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyUpgradeabilityOwner() {
require(msg.sender == upgradeabilityOwner());
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferProxyOwnership(address newOwner) external onlyUpgradeabilityOwner {
require(newOwner != address(0));
emit ProxyOwnershipTransferred(upgradeabilityOwner(), newOwner);
setUpgradeabilityOwner(newOwner);
}
/**
* @dev Allows the upgradeability owner to upgrade the current version of the proxy.
* @param version representing the version name of the new implementation to be set.
* @param implementation representing the address of the new implementation to be set.
*/
function upgradeTo(uint256 version, address implementation) public onlyUpgradeabilityOwner {
_upgradeTo(version, implementation);
}
/**
* @dev Allows the upgradeability owner to upgrade the current version of the proxy and call the new implementation
* to initialize whatever is needed through a low level call.
* @param version representing the version name of the new implementation to be set.
* @param implementation representing the address of the new implementation to be set.
* @param data represents the msg.data to bet sent in the low level call. This parameter may include the function
* signature of the implementation to be called with the needed payload
*/
function upgradeToAndCall(uint256 version, address implementation, bytes data) payable external onlyUpgradeabilityOwner {
upgradeTo(version, implementation);
require(address(this).call.value(msg.value)(data));
}
}
// File: contracts/upgradeability/EternalStorageProxy.sol
pragma solidity 0.4.24;
/**
* @title EternalStorageProxy
* @dev This proxy holds the storage of the token contract and delegates every call to the current implementation set.
* Besides, it allows to upgrade the token's behaviour towards further implementations, and provides basic
* authorization control functionalities
*/
contract EternalStorageProxy is OwnedUpgradeabilityProxy, EternalStorage {}

Contract ABI

[{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"upgradeTo","inputs":[{"type":"uint256","name":"version"},{"type":"address","name":"implementation"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"version","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"implementation","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"upgradeabilityOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"payable","payable":true,"outputs":[],"name":"upgradeToAndCall","inputs":[{"type":"uint256","name":"version"},{"type":"address","name":"implementation"},{"type":"bytes","name":"data"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferProxyOwnership","inputs":[{"type":"address","name":"newOwner"}],"constant":false},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"event","name":"ProxyOwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","indexed":false},{"type":"address","name":"newOwner","indexed":false}],"anonymous":false},{"type":"event","name":"Upgraded","inputs":[{"type":"uint256","name":"version","indexed":false},{"type":"address","name":"implementation","indexed":true}],"anonymous":false}]
            

Contract Byte Code

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