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June 27, 2018 00:16
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Havven Token Contract
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/* | |
* Havven Token Contract | |
* | |
* Havven is a decentralised payment network and stablecoin. | |
* | |
* version: nUSDa | |
* date: 22/6/18 | |
* url: https://github.com/Havven/havven/blob/nUSDa/contracts/Havven.sol | |
*/ | |
pragma solidity 0.4.24; | |
/** | |
* @title Safely manipulate unsigned fixed-point decimals at a given precision level. | |
* @dev Functions accepting uints in this contract and derived contracts | |
* are taken to be such fixed point decimals (including fiat, ether, and nomin quantities). | |
*/ | |
contract SafeDecimalMath { | |
/* Number of decimal places in the representation. */ | |
uint8 public constant decimals = 18; | |
/* The number representing 1.0. */ | |
uint public constant UNIT = 10 ** uint(decimals); | |
/** | |
* @return True iff adding x and y will not overflow. | |
*/ | |
function addIsSafe(uint x, uint y) | |
pure | |
internal | |
returns (bool) | |
{ | |
return x + y >= y; | |
} | |
/** | |
* @return The result of adding x and y, throwing an exception in case of overflow. | |
*/ | |
function safeAdd(uint x, uint y) | |
pure | |
internal | |
returns (uint) | |
{ | |
require(x + y >= y); | |
return x + y; | |
} | |
/** | |
* @return True iff subtracting y from x will not overflow in the negative direction. | |
*/ | |
function subIsSafe(uint x, uint y) | |
pure | |
internal | |
returns (bool) | |
{ | |
return y <= x; | |
} | |
/** | |
* @return The result of subtracting y from x, throwing an exception in case of overflow. | |
*/ | |
function safeSub(uint x, uint y) | |
pure | |
internal | |
returns (uint) | |
{ | |
require(y <= x); | |
return x - y; | |
} | |
/** | |
* @return True iff multiplying x and y would not overflow. | |
*/ | |
function mulIsSafe(uint x, uint y) | |
pure | |
internal | |
returns (bool) | |
{ | |
if (x == 0) { | |
return true; | |
} | |
return (x * y) / x == y; | |
} | |
/** | |
* @return The result of multiplying x and y, throwing an exception in case of overflow. | |
*/ | |
function safeMul(uint x, uint y) | |
pure | |
internal | |
returns (uint) | |
{ | |
if (x == 0) { | |
return 0; | |
} | |
uint p = x * y; | |
require(p / x == y); | |
return p; | |
} | |
/** | |
* @return The result of multiplying x and y, interpreting the operands as fixed-point | |
* decimals. Throws an exception in case of overflow. | |
* | |
* @dev A unit factor is divided out after the product of x and y is evaluated, | |
* so that product must be less than 2**256. | |
* Incidentally, the internal division always rounds down: one could have rounded to the nearest integer, | |
* but then one would be spending a significant fraction of a cent (of order a microether | |
* at present gas prices) in order to save less than one part in 0.5 * 10^18 per operation, if the operands | |
* contain small enough fractional components. It would also marginally diminish the | |
* domain this function is defined upon. | |
*/ | |
function safeMul_dec(uint x, uint y) | |
pure | |
internal | |
returns (uint) | |
{ | |
/* Divide by UNIT to remove the extra factor introduced by the product. */ | |
return safeMul(x, y) / UNIT; | |
} | |
/** | |
* @return True iff the denominator of x/y is nonzero. | |
*/ | |
function divIsSafe(uint x, uint y) | |
pure | |
internal | |
returns (bool) | |
{ | |
return y != 0; | |
} | |
/** | |
* @return The result of dividing x by y, throwing an exception if the divisor is zero. | |
*/ | |
function safeDiv(uint x, uint y) | |
pure | |
internal | |
returns (uint) | |
{ | |
/* Although a 0 denominator already throws an exception, | |
* it is equivalent to a THROW operation, which consumes all gas. | |
* A require statement emits REVERT instead, which remits remaining gas. */ | |
require(y != 0); | |
return x / y; | |
} | |
/** | |
* @return The result of dividing x by y, interpreting the operands as fixed point decimal numbers. | |
* @dev Throws an exception in case of overflow or zero divisor; x must be less than 2^256 / UNIT. | |
* Internal rounding is downward: a similar caveat holds as with safeDecMul(). | |
*/ | |
function safeDiv_dec(uint x, uint y) | |
pure | |
internal | |
returns (uint) | |
{ | |
/* Reintroduce the UNIT factor that will be divided out by y. */ | |
return safeDiv(safeMul(x, UNIT), y); | |
} | |
/** | |
* @dev Convert an unsigned integer to a unsigned fixed-point decimal. | |
* Throw an exception if the result would be out of range. | |
*/ | |
function intToDec(uint i) | |
pure | |
internal | |
returns (uint) | |
{ | |
return safeMul(i, UNIT); | |
} | |
} | |
////////////////// contracts/Owned.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: Owned.sol | |
version: 1.1 | |
author: Anton Jurisevic | |
Dominic Romanowski | |
date: 2018-2-26 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
An Owned contract, to be inherited by other contracts. | |
Requires its owner to be explicitly set in the constructor. | |
Provides an onlyOwner access modifier. | |
To change owner, the current owner must nominate the next owner, | |
who then has to accept the nomination. The nomination can be | |
cancelled before it is accepted by the new owner by having the | |
previous owner change the nomination (setting it to 0). | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title A contract with an owner. | |
* @notice Contract ownership can be transferred by first nominating the new owner, | |
* who must then accept the ownership, which prevents accidental incorrect ownership transfers. | |
*/ | |
contract Owned { | |
address public owner; | |
address public nominatedOwner; | |
/** | |
* @dev Owned Constructor | |
*/ | |
constructor(address _owner) | |
public | |
{ | |
require(_owner != address(0)); | |
owner = _owner; | |
emit OwnerChanged(address(0), _owner); | |
} | |
/** | |
* @notice Nominate a new owner of this contract. | |
* @dev Only the current owner may nominate a new owner. | |
*/ | |
function nominateNewOwner(address _owner) | |
external | |
onlyOwner | |
{ | |
nominatedOwner = _owner; | |
emit OwnerNominated(_owner); | |
} | |
/** | |
* @notice Accept the nomination to be owner. | |
*/ | |
function acceptOwnership() | |
external | |
{ | |
require(msg.sender == nominatedOwner); | |
emit OwnerChanged(owner, nominatedOwner); | |
owner = nominatedOwner; | |
nominatedOwner = address(0); | |
} | |
modifier onlyOwner | |
{ | |
require(msg.sender == owner); | |
_; | |
} | |
event OwnerNominated(address newOwner); | |
event OwnerChanged(address oldOwner, address newOwner); | |
} | |
////////////////// contracts/SelfDestructible.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: SelfDestructible.sol | |
version: 1.2 | |
author: Anton Jurisevic | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
This contract allows an inheriting contract to be destroyed after | |
its owner indicates an intention and then waits for a period | |
without changing their mind. All ether contained in the contract | |
is forwarded to a nominated beneficiary upon destruction. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title A contract that can be destroyed by its owner after a delay elapses. | |
*/ | |
contract SelfDestructible is Owned { | |
uint public initiationTime; | |
bool public selfDestructInitiated; | |
address public selfDestructBeneficiary; | |
uint public constant SELFDESTRUCT_DELAY = 4 weeks; | |
/** | |
* @dev Constructor | |
* @param _owner The account which controls this contract. | |
*/ | |
constructor(address _owner) | |
Owned(_owner) | |
public | |
{ | |
require(_owner != address(0)); | |
selfDestructBeneficiary = _owner; | |
emit SelfDestructBeneficiaryUpdated(_owner); | |
} | |
/** | |
* @notice Set the beneficiary address of this contract. | |
* @dev Only the contract owner may call this. The provided beneficiary must be non-null. | |
* @param _beneficiary The address to pay any eth contained in this contract to upon self-destruction. | |
*/ | |
function setSelfDestructBeneficiary(address _beneficiary) | |
external | |
onlyOwner | |
{ | |
require(_beneficiary != address(0)); | |
selfDestructBeneficiary = _beneficiary; | |
emit SelfDestructBeneficiaryUpdated(_beneficiary); | |
} | |
/** | |
* @notice Begin the self-destruction counter of this contract. | |
* Once the delay has elapsed, the contract may be self-destructed. | |
* @dev Only the contract owner may call this. | |
*/ | |
function initiateSelfDestruct() | |
external | |
onlyOwner | |
{ | |
initiationTime = now; | |
selfDestructInitiated = true; | |
emit SelfDestructInitiated(SELFDESTRUCT_DELAY); | |
} | |
/** | |
* @notice Terminate and reset the self-destruction timer. | |
* @dev Only the contract owner may call this. | |
*/ | |
function terminateSelfDestruct() | |
external | |
onlyOwner | |
{ | |
initiationTime = 0; | |
selfDestructInitiated = false; | |
emit SelfDestructTerminated(); | |
} | |
/** | |
* @notice If the self-destruction delay has elapsed, destroy this contract and | |
* remit any ether it owns to the beneficiary address. | |
* @dev Only the contract owner may call this. | |
*/ | |
function selfDestruct() | |
external | |
onlyOwner | |
{ | |
require(selfDestructInitiated && initiationTime + SELFDESTRUCT_DELAY < now); | |
address beneficiary = selfDestructBeneficiary; | |
emit SelfDestructed(beneficiary); | |
selfdestruct(beneficiary); | |
} | |
event SelfDestructTerminated(); | |
event SelfDestructed(address beneficiary); | |
event SelfDestructInitiated(uint selfDestructDelay); | |
event SelfDestructBeneficiaryUpdated(address newBeneficiary); | |
} | |
////////////////// contracts/State.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: State.sol | |
version: 1.1 | |
author: Dominic Romanowski | |
Anton Jurisevic | |
date: 2018-05-15 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
This contract is used side by side with external state token | |
contracts, such as Havven and Nomin. | |
It provides an easy way to upgrade contract logic while | |
maintaining all user balances and allowances. This is designed | |
to make the changeover as easy as possible, since mappings | |
are not so cheap or straightforward to migrate. | |
The first deployed contract would create this state contract, | |
using it as its store of balances. | |
When a new contract is deployed, it links to the existing | |
state contract, whose owner would then change its associated | |
contract to the new one. | |
----------------------------------------------------------------- | |
*/ | |
contract State is Owned { | |
// the address of the contract that can modify variables | |
// this can only be changed by the owner of this contract | |
address public associatedContract; | |
constructor(address _owner, address _associatedContract) | |
Owned(_owner) | |
public | |
{ | |
associatedContract = _associatedContract; | |
emit AssociatedContractUpdated(_associatedContract); | |
} | |
/* ========== SETTERS ========== */ | |
// Change the associated contract to a new address | |
function setAssociatedContract(address _associatedContract) | |
external | |
onlyOwner | |
{ | |
associatedContract = _associatedContract; | |
emit AssociatedContractUpdated(_associatedContract); | |
} | |
/* ========== MODIFIERS ========== */ | |
modifier onlyAssociatedContract | |
{ | |
require(msg.sender == associatedContract); | |
_; | |
} | |
/* ========== EVENTS ========== */ | |
event AssociatedContractUpdated(address associatedContract); | |
} | |
////////////////// contracts/TokenState.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: TokenState.sol | |
version: 1.1 | |
author: Dominic Romanowski | |
Anton Jurisevic | |
date: 2018-05-15 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
A contract that holds the state of an ERC20 compliant token. | |
This contract is used side by side with external state token | |
contracts, such as Havven and Nomin. | |
It provides an easy way to upgrade contract logic while | |
maintaining all user balances and allowances. This is designed | |
to make the changeover as easy as possible, since mappings | |
are not so cheap or straightforward to migrate. | |
The first deployed contract would create this state contract, | |
using it as its store of balances. | |
When a new contract is deployed, it links to the existing | |
state contract, whose owner would then change its associated | |
contract to the new one. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title ERC20 Token State | |
* @notice Stores balance information of an ERC20 token contract. | |
*/ | |
contract TokenState is State { | |
/* ERC20 fields. */ | |
mapping(address => uint) public balanceOf; | |
mapping(address => mapping(address => uint)) public allowance; | |
/** | |
* @dev Constructor | |
* @param _owner The address which controls this contract. | |
* @param _associatedContract The ERC20 contract whose state this composes. | |
*/ | |
constructor(address _owner, address _associatedContract) | |
State(_owner, _associatedContract) | |
public | |
{} | |
/* ========== SETTERS ========== */ | |
/** | |
* @notice Set ERC20 allowance. | |
* @dev Only the associated contract may call this. | |
* @param tokenOwner The authorising party. | |
* @param spender The authorised party. | |
* @param value The total value the authorised party may spend on the | |
* authorising party's behalf. | |
*/ | |
function setAllowance(address tokenOwner, address spender, uint value) | |
external | |
onlyAssociatedContract | |
{ | |
allowance[tokenOwner][spender] = value; | |
} | |
/** | |
* @notice Set the balance in a given account | |
* @dev Only the associated contract may call this. | |
* @param account The account whose value to set. | |
* @param value The new balance of the given account. | |
*/ | |
function setBalanceOf(address account, uint value) | |
external | |
onlyAssociatedContract | |
{ | |
balanceOf[account] = value; | |
} | |
} | |
////////////////// contracts/Proxy.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: Proxy.sol | |
version: 1.3 | |
author: Anton Jurisevic | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
A proxy contract that, if it does not recognise the function | |
being called on it, passes all value and call data to an | |
underlying target contract. | |
This proxy has the capacity to toggle between DELEGATECALL | |
and CALL style proxy functionality. | |
The former executes in the proxy's context, and so will preserve | |
msg.sender and store data at the proxy address. The latter will not. | |
Therefore, any contract the proxy wraps in the CALL style must | |
implement the Proxyable interface, in order that it can pass msg.sender | |
into the underlying contract as the state parameter, messageSender. | |
----------------------------------------------------------------- | |
*/ | |
contract Proxy is Owned { | |
Proxyable public target; | |
bool public useDELEGATECALL; | |
constructor(address _owner) | |
Owned(_owner) | |
public | |
{} | |
function setTarget(Proxyable _target) | |
external | |
onlyOwner | |
{ | |
target = _target; | |
emit TargetUpdated(_target); | |
} | |
function setUseDELEGATECALL(bool value) | |
external | |
onlyOwner | |
{ | |
useDELEGATECALL = value; | |
} | |
function _emit(bytes callData, uint numTopics, | |
bytes32 topic1, bytes32 topic2, | |
bytes32 topic3, bytes32 topic4) | |
external | |
onlyTarget | |
{ | |
uint size = callData.length; | |
bytes memory _callData = callData; | |
assembly { | |
/* The first 32 bytes of callData contain its length (as specified by the abi). | |
* Length is assumed to be a uint256 and therefore maximum of 32 bytes | |
* in length. It is also leftpadded to be a multiple of 32 bytes. | |
* This means moving call_data across 32 bytes guarantees we correctly access | |
* the data itself. */ | |
switch numTopics | |
case 0 { | |
log0(add(_callData, 32), size) | |
} | |
case 1 { | |
log1(add(_callData, 32), size, topic1) | |
} | |
case 2 { | |
log2(add(_callData, 32), size, topic1, topic2) | |
} | |
case 3 { | |
log3(add(_callData, 32), size, topic1, topic2, topic3) | |
} | |
case 4 { | |
log4(add(_callData, 32), size, topic1, topic2, topic3, topic4) | |
} | |
} | |
} | |
function() | |
external | |
payable | |
{ | |
if (useDELEGATECALL) { | |
assembly { | |
/* Copy call data into free memory region. */ | |
let free_ptr := mload(0x40) | |
calldatacopy(free_ptr, 0, calldatasize) | |
/* Forward all gas and call data to the target contract. */ | |
let result := delegatecall(gas, sload(target_slot), free_ptr, calldatasize, 0, 0) | |
returndatacopy(free_ptr, 0, returndatasize) | |
/* Revert if the call failed, otherwise return the result. */ | |
if iszero(result) { revert(free_ptr, returndatasize) } | |
return(free_ptr, returndatasize) | |
} | |
} else { | |
/* Here we are as above, but must send the messageSender explicitly | |
* since we are using CALL rather than DELEGATECALL. */ | |
target.setMessageSender(msg.sender); | |
assembly { | |
let free_ptr := mload(0x40) | |
calldatacopy(free_ptr, 0, calldatasize) | |
/* We must explicitly forward ether to the underlying contract as well. */ | |
let result := call(gas, sload(target_slot), callvalue, free_ptr, calldatasize, 0, 0) | |
returndatacopy(free_ptr, 0, returndatasize) | |
if iszero(result) { revert(free_ptr, returndatasize) } | |
return(free_ptr, returndatasize) | |
} | |
} | |
} | |
modifier onlyTarget { | |
require(Proxyable(msg.sender) == target); | |
_; | |
} | |
event TargetUpdated(Proxyable newTarget); | |
} | |
////////////////// contracts/Proxyable.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: Proxyable.sol | |
version: 1.1 | |
author: Anton Jurisevic | |
date: 2018-05-15 | |
checked: Mike Spain | |
approved: Samuel Brooks | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
A proxyable contract that works hand in hand with the Proxy contract | |
to allow for anyone to interact with the underlying contract both | |
directly and through the proxy. | |
----------------------------------------------------------------- | |
*/ | |
// This contract should be treated like an abstract contract | |
contract Proxyable is Owned { | |
/* The proxy this contract exists behind. */ | |
Proxy public proxy; | |
/* The caller of the proxy, passed through to this contract. | |
* Note that every function using this member must apply the onlyProxy or | |
* optionalProxy modifiers, otherwise their invocations can use stale values. */ | |
address messageSender; | |
constructor(address _proxy, address _owner) | |
Owned(_owner) | |
public | |
{ | |
proxy = Proxy(_proxy); | |
emit ProxyUpdated(_proxy); | |
} | |
function setProxy(address _proxy) | |
external | |
onlyOwner | |
{ | |
proxy = Proxy(_proxy); | |
emit ProxyUpdated(_proxy); | |
} | |
function setMessageSender(address sender) | |
external | |
onlyProxy | |
{ | |
messageSender = sender; | |
} | |
modifier onlyProxy { | |
require(Proxy(msg.sender) == proxy); | |
_; | |
} | |
modifier optionalProxy | |
{ | |
if (Proxy(msg.sender) != proxy) { | |
messageSender = msg.sender; | |
} | |
_; | |
} | |
modifier optionalProxy_onlyOwner | |
{ | |
if (Proxy(msg.sender) != proxy) { | |
messageSender = msg.sender; | |
} | |
require(messageSender == owner); | |
_; | |
} | |
event ProxyUpdated(address proxyAddress); | |
} | |
////////////////// contracts/ExternStateToken.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: ExternStateToken.sol | |
version: 1.3 | |
author: Anton Jurisevic | |
Dominic Romanowski | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
A partial ERC20 token contract, designed to operate with a proxy. | |
To produce a complete ERC20 token, transfer and transferFrom | |
tokens must be implemented, using the provided _byProxy internal | |
functions. | |
This contract utilises an external state for upgradeability. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title ERC20 Token contract, with detached state and designed to operate behind a proxy. | |
*/ | |
contract ExternStateToken is SafeDecimalMath, SelfDestructible, Proxyable { | |
/* ========== STATE VARIABLES ========== */ | |
/* Stores balances and allowances. */ | |
TokenState public tokenState; | |
/* Other ERC20 fields. | |
* Note that the decimals field is defined in SafeDecimalMath.*/ | |
string public name; | |
string public symbol; | |
uint public totalSupply; | |
/** | |
* @dev Constructor. | |
* @param _proxy The proxy associated with this contract. | |
* @param _name Token's ERC20 name. | |
* @param _symbol Token's ERC20 symbol. | |
* @param _totalSupply The total supply of the token. | |
* @param _tokenState The TokenState contract address. | |
* @param _owner The owner of this contract. | |
*/ | |
constructor(address _proxy, string _name, string _symbol, uint _totalSupply, | |
TokenState _tokenState, address _owner) | |
SelfDestructible(_owner) | |
Proxyable(_proxy, _owner) | |
public | |
{ | |
name = _name; | |
symbol = _symbol; | |
totalSupply = _totalSupply; | |
tokenState = _tokenState; | |
} | |
/* ========== VIEWS ========== */ | |
/** | |
* @notice Returns the ERC20 allowance of one party to spend on behalf of another. | |
* @param owner The party authorising spending of their funds. | |
* @param spender The party spending tokenOwner's funds. | |
*/ | |
function allowance(address owner, address spender) | |
public | |
view | |
returns (uint) | |
{ | |
return tokenState.allowance(owner, spender); | |
} | |
/** | |
* @notice Returns the ERC20 token balance of a given account. | |
*/ | |
function balanceOf(address account) | |
public | |
view | |
returns (uint) | |
{ | |
return tokenState.balanceOf(account); | |
} | |
/* ========== MUTATIVE FUNCTIONS ========== */ | |
/** | |
* @notice Set the address of the TokenState contract. | |
* @dev This can be used to "pause" transfer functionality, by pointing the tokenState at 0x000.. | |
* as balances would be unreachable. | |
*/ | |
function setTokenState(TokenState _tokenState) | |
external | |
optionalProxy_onlyOwner | |
{ | |
tokenState = _tokenState; | |
emitTokenStateUpdated(_tokenState); | |
} | |
function _internalTransfer(address from, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
/* Disallow transfers to irretrievable-addresses. */ | |
require(to != address(0)); | |
require(to != address(this)); | |
require(to != address(proxy)); | |
/* Insufficient balance will be handled by the safe subtraction. */ | |
tokenState.setBalanceOf(from, safeSub(tokenState.balanceOf(from), value)); | |
tokenState.setBalanceOf(to, safeAdd(tokenState.balanceOf(to), value)); | |
emitTransfer(from, to, value); | |
return true; | |
} | |
/** | |
* @dev Perform an ERC20 token transfer. Designed to be called by transfer functions possessing | |
* the onlyProxy or optionalProxy modifiers. | |
*/ | |
function _transfer_byProxy(address from, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
return _internalTransfer(from, to, value); | |
} | |
/** | |
* @dev Perform an ERC20 token transferFrom. Designed to be called by transferFrom functions | |
* possessing the optionalProxy or optionalProxy modifiers. | |
*/ | |
function _transferFrom_byProxy(address sender, address from, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
/* Insufficient allowance will be handled by the safe subtraction. */ | |
tokenState.setAllowance(from, sender, safeSub(tokenState.allowance(from, sender), value)); | |
return _internalTransfer(from, to, value); | |
} | |
/** | |
* @notice Approves spender to transfer on the message sender's behalf. | |
*/ | |
function approve(address spender, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
address sender = messageSender; | |
tokenState.setAllowance(sender, spender, value); | |
emitApproval(sender, spender, value); | |
return true; | |
} | |
/* ========== EVENTS ========== */ | |
event Transfer(address indexed from, address indexed to, uint value); | |
bytes32 constant TRANSFER_SIG = keccak256("Transfer(address,address,uint256)"); | |
function emitTransfer(address from, address to, uint value) internal { | |
proxy._emit(abi.encode(value), 3, TRANSFER_SIG, bytes32(from), bytes32(to), 0); | |
} | |
event Approval(address indexed owner, address indexed spender, uint value); | |
bytes32 constant APPROVAL_SIG = keccak256("Approval(address,address,uint256)"); | |
function emitApproval(address owner, address spender, uint value) internal { | |
proxy._emit(abi.encode(value), 3, APPROVAL_SIG, bytes32(owner), bytes32(spender), 0); | |
} | |
event TokenStateUpdated(address newTokenState); | |
bytes32 constant TOKENSTATEUPDATED_SIG = keccak256("TokenStateUpdated(address)"); | |
function emitTokenStateUpdated(address newTokenState) internal { | |
proxy._emit(abi.encode(newTokenState), 1, TOKENSTATEUPDATED_SIG, 0, 0, 0); | |
} | |
} | |
////////////////// contracts/FeeToken.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: FeeToken.sol | |
version: 1.3 | |
author: Anton Jurisevic | |
Dominic Romanowski | |
Kevin Brown | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
A token which also has a configurable fee rate | |
charged on its transfers. This is designed to be overridden in | |
order to produce an ERC20-compliant token. | |
These fees accrue into a pool, from which a nominated authority | |
may withdraw. | |
This contract utilises an external state for upgradeability. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title ERC20 Token contract, with detached state. | |
* Additionally charges fees on each transfer. | |
*/ | |
contract FeeToken is ExternStateToken { | |
/* ========== STATE VARIABLES ========== */ | |
/* ERC20 members are declared in ExternStateToken. */ | |
/* A percentage fee charged on each transfer. */ | |
uint public transferFeeRate; | |
/* Fee may not exceed 10%. */ | |
uint constant MAX_TRANSFER_FEE_RATE = UNIT / 10; | |
/* The address with the authority to distribute fees. */ | |
address public feeAuthority; | |
/* ========== CONSTRUCTOR ========== */ | |
/** | |
* @dev Constructor. | |
* @param _proxy The proxy associated with this contract. | |
* @param _name Token's ERC20 name. | |
* @param _symbol Token's ERC20 symbol. | |
* @param _totalSupply The total supply of the token. | |
* @param _transferFeeRate The fee rate to charge on transfers. | |
* @param _feeAuthority The address which has the authority to withdraw fees from the accumulated pool. | |
* @param _owner The owner of this contract. | |
*/ | |
constructor(address _proxy, string _name, string _symbol, uint _totalSupply, | |
uint _transferFeeRate, address _feeAuthority, address _owner) | |
ExternStateToken(_proxy, _name, _symbol, _totalSupply, | |
new TokenState(_owner, address(this)), | |
_owner) | |
public | |
{ | |
feeAuthority = _feeAuthority; | |
/* Constructed transfer fee rate should respect the maximum fee rate. */ | |
require(_transferFeeRate <= MAX_TRANSFER_FEE_RATE); | |
transferFeeRate = _transferFeeRate; | |
} | |
/* ========== SETTERS ========== */ | |
/** | |
* @notice Set the transfer fee, anywhere within the range 0-10%. | |
* @dev The fee rate is in decimal format, with UNIT being the value of 100%. | |
*/ | |
function setTransferFeeRate(uint _transferFeeRate) | |
external | |
optionalProxy_onlyOwner | |
{ | |
require(_transferFeeRate <= MAX_TRANSFER_FEE_RATE); | |
transferFeeRate = _transferFeeRate; | |
emitTransferFeeRateUpdated(_transferFeeRate); | |
} | |
/** | |
* @notice Set the address of the user/contract responsible for collecting or | |
* distributing fees. | |
*/ | |
function setFeeAuthority(address _feeAuthority) | |
public | |
optionalProxy_onlyOwner | |
{ | |
feeAuthority = _feeAuthority; | |
emitFeeAuthorityUpdated(_feeAuthority); | |
} | |
/* ========== VIEWS ========== */ | |
/** | |
* @notice Calculate the Fee charged on top of a value being sent | |
* @return Return the fee charged | |
*/ | |
function transferFeeIncurred(uint value) | |
public | |
view | |
returns (uint) | |
{ | |
return safeMul_dec(value, transferFeeRate); | |
/* Transfers less than the reciprocal of transferFeeRate should be completely eaten up by fees. | |
* This is on the basis that transfers less than this value will result in a nil fee. | |
* Probably too insignificant to worry about, but the following code will achieve it. | |
* if (fee == 0 && transferFeeRate != 0) { | |
* return _value; | |
* } | |
* return fee; | |
*/ | |
} | |
/** | |
* @notice The value that you would need to send so that the recipient receives | |
* a specified value. | |
*/ | |
function transferPlusFee(uint value) | |
external | |
view | |
returns (uint) | |
{ | |
return safeAdd(value, transferFeeIncurred(value)); | |
} | |
/** | |
* @notice The amount the recipient will receive if you send a certain number of tokens. | |
*/ | |
function amountReceived(uint value) | |
public | |
view | |
returns (uint) | |
{ | |
return safeDiv_dec(value, safeAdd(UNIT, transferFeeRate)); | |
} | |
/** | |
* @notice Collected fees sit here until they are distributed. | |
* @dev The balance of the nomin contract itself is the fee pool. | |
*/ | |
function feePool() | |
external | |
view | |
returns (uint) | |
{ | |
return tokenState.balanceOf(address(this)); | |
} | |
/* ========== MUTATIVE FUNCTIONS ========== */ | |
/** | |
* @notice Base of transfer functions | |
*/ | |
function _internalTransfer(address from, address to, uint amount, uint fee) | |
internal | |
returns (bool) | |
{ | |
/* Disallow transfers to irretrievable-addresses. */ | |
require(to != address(0)); | |
require(to != address(this)); | |
require(to != address(proxy)); | |
/* Insufficient balance will be handled by the safe subtraction. */ | |
tokenState.setBalanceOf(from, safeSub(tokenState.balanceOf(from), safeAdd(amount, fee))); | |
tokenState.setBalanceOf(to, safeAdd(tokenState.balanceOf(to), amount)); | |
tokenState.setBalanceOf(address(this), safeAdd(tokenState.balanceOf(address(this)), fee)); | |
/* Emit events for both the transfer itself and the fee. */ | |
emitTransfer(from, to, amount); | |
emitTransfer(from, address(this), fee); | |
return true; | |
} | |
/** | |
* @notice ERC20 friendly transfer function. | |
*/ | |
function _transfer_byProxy(address sender, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
uint received = amountReceived(value); | |
uint fee = safeSub(value, received); | |
return _internalTransfer(sender, to, received, fee); | |
} | |
/** | |
* @notice ERC20 friendly transferFrom function. | |
*/ | |
function _transferFrom_byProxy(address sender, address from, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
/* The fee is deducted from the amount sent. */ | |
uint received = amountReceived(value); | |
uint fee = safeSub(value, received); | |
/* Reduce the allowance by the amount we're transferring. | |
* The safeSub call will handle an insufficient allowance. */ | |
tokenState.setAllowance(from, sender, safeSub(tokenState.allowance(from, sender), value)); | |
return _internalTransfer(from, to, received, fee); | |
} | |
/** | |
* @notice Ability to transfer where the sender pays the fees (not ERC20) | |
*/ | |
function _transferSenderPaysFee_byProxy(address sender, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
/* The fee is added to the amount sent. */ | |
uint fee = transferFeeIncurred(value); | |
return _internalTransfer(sender, to, value, fee); | |
} | |
/** | |
* @notice Ability to transferFrom where they sender pays the fees (not ERC20). | |
*/ | |
function _transferFromSenderPaysFee_byProxy(address sender, address from, address to, uint value) | |
internal | |
returns (bool) | |
{ | |
/* The fee is added to the amount sent. */ | |
uint fee = transferFeeIncurred(value); | |
uint total = safeAdd(value, fee); | |
/* Reduce the allowance by the amount we're transferring. */ | |
tokenState.setAllowance(from, sender, safeSub(tokenState.allowance(from, sender), total)); | |
return _internalTransfer(from, to, value, fee); | |
} | |
/** | |
* @notice Withdraw tokens from the fee pool into a given account. | |
* @dev Only the fee authority may call this. | |
*/ | |
function withdrawFees(address account, uint value) | |
external | |
onlyFeeAuthority | |
returns (bool) | |
{ | |
require(account != address(0)); | |
/* 0-value withdrawals do nothing. */ | |
if (value == 0) { | |
return false; | |
} | |
/* Safe subtraction ensures an exception is thrown if the balance is insufficient. */ | |
tokenState.setBalanceOf(address(this), safeSub(tokenState.balanceOf(address(this)), value)); | |
tokenState.setBalanceOf(account, safeAdd(tokenState.balanceOf(account), value)); | |
emitFeesWithdrawn(account, value); | |
emitTransfer(address(this), account, value); | |
return true; | |
} | |
/** | |
* @notice Donate tokens from the sender's balance into the fee pool. | |
*/ | |
function donateToFeePool(uint n) | |
external | |
optionalProxy | |
returns (bool) | |
{ | |
address sender = messageSender; | |
/* Empty donations are disallowed. */ | |
uint balance = tokenState.balanceOf(sender); | |
require(balance != 0); | |
/* safeSub ensures the donor has sufficient balance. */ | |
tokenState.setBalanceOf(sender, safeSub(balance, n)); | |
tokenState.setBalanceOf(address(this), safeAdd(tokenState.balanceOf(address(this)), n)); | |
emitFeesDonated(sender, n); | |
emitTransfer(sender, address(this), n); | |
return true; | |
} | |
/* ========== MODIFIERS ========== */ | |
modifier onlyFeeAuthority | |
{ | |
require(msg.sender == feeAuthority); | |
_; | |
} | |
/* ========== EVENTS ========== */ | |
event TransferFeeRateUpdated(uint newFeeRate); | |
bytes32 constant TRANSFERFEERATEUPDATED_SIG = keccak256("TransferFeeRateUpdated(uint256)"); | |
function emitTransferFeeRateUpdated(uint newFeeRate) internal { | |
proxy._emit(abi.encode(newFeeRate), 1, TRANSFERFEERATEUPDATED_SIG, 0, 0, 0); | |
} | |
event FeeAuthorityUpdated(address newFeeAuthority); | |
bytes32 constant FEEAUTHORITYUPDATED_SIG = keccak256("FeeAuthorityUpdated(address)"); | |
function emitFeeAuthorityUpdated(address newFeeAuthority) internal { | |
proxy._emit(abi.encode(newFeeAuthority), 1, FEEAUTHORITYUPDATED_SIG, 0, 0, 0); | |
} | |
event FeesWithdrawn(address indexed account, uint value); | |
bytes32 constant FEESWITHDRAWN_SIG = keccak256("FeesWithdrawn(address,uint256)"); | |
function emitFeesWithdrawn(address account, uint value) internal { | |
proxy._emit(abi.encode(value), 2, FEESWITHDRAWN_SIG, bytes32(account), 0, 0); | |
} | |
event FeesDonated(address indexed donor, uint value); | |
bytes32 constant FEESDONATED_SIG = keccak256("FeesDonated(address,uint256)"); | |
function emitFeesDonated(address donor, uint value) internal { | |
proxy._emit(abi.encode(value), 2, FEESDONATED_SIG, bytes32(donor), 0, 0); | |
} | |
} | |
////////////////// contracts/Court.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: Court.sol | |
version: 1.2 | |
author: Anton Jurisevic | |
Mike Spain | |
Dominic Romanowski | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
This provides the nomin contract with a confiscation | |
facility, if enough havven owners vote to confiscate a target | |
account's nomins. | |
This is designed to provide a mechanism to respond to abusive | |
contracts such as nomin wrappers, which would allow users to | |
trade wrapped nomins without accruing fees on those transactions. | |
In order to prevent tyranny, an account may only be frozen if | |
users controlling at least 30% of the value of havvens participate, | |
and a two thirds majority is attained in that vote. | |
In order to prevent tyranny of the majority or mob justice, | |
confiscation motions are only approved if the havven foundation | |
approves the result. | |
This latter requirement may be lifted in future versions. | |
The foundation, or any user with a sufficient havven balance may | |
bring a confiscation motion. | |
A motion lasts for a default period of one week, with a further | |
confirmation period in which the foundation approves the result. | |
The latter period may conclude early upon the foundation's decision | |
to either veto or approve the mooted confiscation motion. | |
If the confirmation period elapses without the foundation making | |
a decision, the motion fails. | |
The weight of a havven holder's vote is determined by examining | |
their average balance over the last completed fee period prior to | |
the beginning of a given motion. | |
Thus, since a fee period can roll over in the middle of a motion, | |
we must also track a user's average balance of the last two periods. | |
This system is designed such that it cannot be attacked by users | |
transferring funds between themselves, while also not requiring them | |
to lock their havvens for the duration of the vote. This is possible | |
since any transfer that increases the average balance in one account | |
will be reflected by an equivalent reduction in the voting weight in | |
the other. | |
At present a user may cast a vote only for one motion at a time, | |
but may cancel their vote at any time except during the confirmation period, | |
when the vote tallies must remain static until the matter has been settled. | |
A motion to confiscate the balance of a given address composes | |
a state machine built of the following states: | |
Waiting: | |
- A user with standing brings a motion: | |
If the target address is not frozen; | |
initialise vote tallies to 0; | |
transition to the Voting state. | |
- An account cancels a previous residual vote: | |
remain in the Waiting state. | |
Voting: | |
- The foundation vetoes the in-progress motion: | |
transition to the Waiting state. | |
- The voting period elapses: | |
transition to the Confirmation state. | |
- An account votes (for or against the motion): | |
its weight is added to the appropriate tally; | |
remain in the Voting state. | |
- An account cancels its previous vote: | |
its weight is deducted from the appropriate tally (if any); | |
remain in the Voting state. | |
Confirmation: | |
- The foundation vetoes the completed motion: | |
transition to the Waiting state. | |
- The foundation approves confiscation of the target account: | |
freeze the target account, transfer its nomin balance to the fee pool; | |
transition to the Waiting state. | |
- The confirmation period elapses: | |
transition to the Waiting state. | |
User votes are not automatically cancelled upon the conclusion of a motion. | |
Therefore, after a motion comes to a conclusion, if a user wishes to vote | |
in another motion, they must manually cancel their vote in order to do so. | |
This procedure is designed to be relatively simple. | |
There are some things that can be added to enhance the functionality | |
at the expense of simplicity and efficiency: | |
- Democratic unfreezing of nomin accounts (induces multiple categories of vote) | |
- Configurable per-vote durations; | |
- Vote standing denominated in a fiat quantity rather than a quantity of havvens; | |
- Confiscate from multiple addresses in a single vote; | |
We might consider updating the contract with any of these features at a later date if necessary. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title A court contract allowing a democratic mechanism to dissuade token wrappers. | |
*/ | |
contract Court is SafeDecimalMath, Owned { | |
/* ========== STATE VARIABLES ========== */ | |
/* The addresses of the token contracts this confiscation court interacts with. */ | |
Havven public havven; | |
Nomin public nomin; | |
/* The minimum issued nomin balance required to be considered to have | |
* standing to begin confiscation proceedings. */ | |
uint public minStandingBalance = 100 * UNIT; | |
/* The voting period lasts for this duration, | |
* and if set, must fall within the given bounds. */ | |
uint public votingPeriod = 1 weeks; | |
uint constant MIN_VOTING_PERIOD = 3 days; | |
uint constant MAX_VOTING_PERIOD = 4 weeks; | |
/* Duration of the period during which the foundation may confirm | |
* or veto a motion that has concluded. | |
* If set, the confirmation duration must fall within the given bounds. */ | |
uint public confirmationPeriod = 1 weeks; | |
uint constant MIN_CONFIRMATION_PERIOD = 1 days; | |
uint constant MAX_CONFIRMATION_PERIOD = 2 weeks; | |
/* No fewer than this fraction of total available voting power must | |
* participate in a motion in order for a quorum to be reached. | |
* The participation fraction required may be set no lower than 10%. | |
* As a fraction, it is expressed in terms of UNIT, not as an absolute quantity. */ | |
uint public requiredParticipation = 3 * UNIT / 10; | |
uint constant MIN_REQUIRED_PARTICIPATION = UNIT / 10; | |
/* At least this fraction of participating votes must be in favour of | |
* confiscation for the motion to pass. | |
* The required majority may be no lower than 50%. | |
* As a fraction, it is expressed in terms of UNIT, not as an absolute quantity. */ | |
uint public requiredMajority = (2 * UNIT) / 3; | |
uint constant MIN_REQUIRED_MAJORITY = UNIT / 2; | |
/* The next ID to use for opening a motion. | |
* The 0 motion ID corresponds to no motion, | |
* and is used as a null value for later comparison. */ | |
uint nextMotionID = 1; | |
/* Mapping from motion IDs to target addresses. */ | |
mapping(uint => address) public motionTarget; | |
/* The ID a motion on an address is currently operating at. | |
* Zero if no such motion is running. */ | |
mapping(address => uint) public targetMotionID; | |
/* The timestamp at which a motion began. This is used to determine | |
* whether a motion is: running, in the confirmation period, | |
* or has concluded. | |
* A motion runs from its start time t until (t + votingPeriod), | |
* and then the confirmation period terminates no later than | |
* (t + votingPeriod + confirmationPeriod). */ | |
mapping(uint => uint) public motionStartTime; | |
/* The tallies for and against confiscation of a given balance. | |
* These are set to zero at the start of a motion, and also on conclusion, | |
* just to keep the state clean. */ | |
mapping(uint => uint) public votesFor; | |
mapping(uint => uint) public votesAgainst; | |
/* The last average balance of a user at the time they voted | |
* in a particular motion. | |
* If we did not save this information then we would have to | |
* disallow transfers into an account lest it cancel a vote | |
* with greater weight than that with which it originally voted, | |
* and the fee period rolled over in between. */ | |
// TODO: This may be unnecessary now that votes are forced to be | |
// within a fee period. Likely possible to delete this. | |
mapping(address => mapping(uint => uint)) voteWeight; | |
/* The possible vote types. | |
* Abstention: not participating in a motion; This is the default value. | |
* Yea: voting in favour of a motion. | |
* Nay: voting against a motion. */ | |
enum Vote {Abstention, Yea, Nay} | |
/* A given account's vote in some confiscation motion. | |
* This requires the default value of the Vote enum to correspond to an abstention. */ | |
mapping(address => mapping(uint => Vote)) public vote; | |
/* ========== CONSTRUCTOR ========== */ | |
/** | |
* @dev Court Constructor. | |
*/ | |
constructor(Havven _havven, Nomin _nomin, address _owner) | |
Owned(_owner) | |
public | |
{ | |
havven = _havven; | |
nomin = _nomin; | |
} | |
/* ========== SETTERS ========== */ | |
/** | |
* @notice Set the minimum required havven balance to have standing to bring a motion. | |
* @dev Only the contract owner may call this. | |
*/ | |
function setMinStandingBalance(uint balance) | |
external | |
onlyOwner | |
{ | |
/* No requirement on the standing threshold here; | |
* the foundation can set this value such that | |
* anyone or no one can actually start a motion. */ | |
minStandingBalance = balance; | |
} | |
/** | |
* @notice Set the length of time a vote runs for. | |
* @dev Only the contract owner may call this. The proposed duration must fall | |
* within sensible bounds (3 days to 4 weeks), and must be no longer than a single fee period. | |
*/ | |
function setVotingPeriod(uint duration) | |
external | |
onlyOwner | |
{ | |
require(MIN_VOTING_PERIOD <= duration && | |
duration <= MAX_VOTING_PERIOD); | |
/* Require that the voting period is no longer than a single fee period, | |
* So that a single vote can span at most two fee periods. */ | |
require(duration <= havven.feePeriodDuration()); | |
votingPeriod = duration; | |
} | |
/** | |
* @notice Set the confirmation period after a vote has concluded. | |
* @dev Only the contract owner may call this. The proposed duration must fall | |
* within sensible bounds (1 day to 2 weeks). | |
*/ | |
function setConfirmationPeriod(uint duration) | |
external | |
onlyOwner | |
{ | |
require(MIN_CONFIRMATION_PERIOD <= duration && | |
duration <= MAX_CONFIRMATION_PERIOD); | |
confirmationPeriod = duration; | |
} | |
/** | |
* @notice Set the required fraction of all Havvens that need to be part of | |
* a vote for it to pass. | |
*/ | |
function setRequiredParticipation(uint fraction) | |
external | |
onlyOwner | |
{ | |
require(MIN_REQUIRED_PARTICIPATION <= fraction); | |
requiredParticipation = fraction; | |
} | |
/** | |
* @notice Set what portion of voting havvens need to be in the affirmative | |
* to allow it to pass. | |
*/ | |
function setRequiredMajority(uint fraction) | |
external | |
onlyOwner | |
{ | |
require(MIN_REQUIRED_MAJORITY <= fraction); | |
requiredMajority = fraction; | |
} | |
/* ========== VIEW FUNCTIONS ========== */ | |
/** | |
* @notice There is a motion in progress on the specified | |
* account, and votes are being accepted in that motion. | |
*/ | |
function motionVoting(uint motionID) | |
public | |
view | |
returns (bool) | |
{ | |
return motionStartTime[motionID] < now && now < motionStartTime[motionID] + votingPeriod; | |
} | |
/** | |
* @notice A vote on the target account has concluded, but the motion | |
* has not yet been approved, vetoed, or closed. */ | |
function motionConfirming(uint motionID) | |
public | |
view | |
returns (bool) | |
{ | |
/* These values are timestamps, they will not overflow | |
* as they can only ever be initialised to relatively small values. | |
*/ | |
uint startTime = motionStartTime[motionID]; | |
return startTime + votingPeriod <= now && | |
now < startTime + votingPeriod + confirmationPeriod; | |
} | |
/** | |
* @notice A vote motion either not begun, or it has completely terminated. | |
*/ | |
function motionWaiting(uint motionID) | |
public | |
view | |
returns (bool) | |
{ | |
/* These values are timestamps, they will not overflow | |
* as they can only ever be initialised to relatively small values. */ | |
return motionStartTime[motionID] + votingPeriod + confirmationPeriod <= now; | |
} | |
/** | |
* @notice If the motion was to terminate at this instant, it would pass. | |
* That is: there was sufficient participation and a sizeable enough majority. | |
*/ | |
function motionPasses(uint motionID) | |
public | |
view | |
returns (bool) | |
{ | |
uint yeas = votesFor[motionID]; | |
uint nays = votesAgainst[motionID]; | |
uint totalVotes = safeAdd(yeas, nays); | |
if (totalVotes == 0) { | |
return false; | |
} | |
uint participation = safeDiv_dec(totalVotes, havven.totalIssuanceLastAverageBalance()); | |
uint fractionInFavour = safeDiv_dec(yeas, totalVotes); | |
/* We require the result to be strictly greater than the requirement | |
* to enforce a majority being "50% + 1", and so on. */ | |
return participation > requiredParticipation && | |
fractionInFavour > requiredMajority; | |
} | |
/** | |
* @notice Return if the specified account has voted on the specified motion | |
*/ | |
function hasVoted(address account, uint motionID) | |
public | |
view | |
returns (bool) | |
{ | |
return vote[account][motionID] != Vote.Abstention; | |
} | |
/* ========== MUTATIVE FUNCTIONS ========== */ | |
/** | |
* @notice Begin a motion to confiscate the funds in a given nomin account. | |
* @dev Only the foundation, or accounts with sufficient havven balances | |
* may elect to start such a motion. | |
* @return Returns the ID of the motion that was begun. | |
*/ | |
function beginMotion(address target) | |
external | |
returns (uint) | |
{ | |
/* A confiscation motion must be mooted by someone with standing. */ | |
require((havven.issuanceLastAverageBalance(msg.sender) >= minStandingBalance) || | |
msg.sender == owner); | |
/* Require that the voting period is longer than a single fee period, | |
* So that a single vote can span at most two fee periods. */ | |
require(votingPeriod <= havven.feePeriodDuration()); | |
/* There must be no confiscation motion already running for this account. */ | |
require(targetMotionID[target] == 0); | |
/* Disallow votes on accounts that are currently frozen. */ | |
require(!nomin.frozen(target)); | |
/* It is necessary to roll over the fee period if it has elapsed, or else | |
* the vote might be initialised having begun in the past. */ | |
havven.rolloverFeePeriodIfElapsed(); | |
uint motionID = nextMotionID++; | |
motionTarget[motionID] = target; | |
targetMotionID[target] = motionID; | |
/* Start the vote at the start of the next fee period */ | |
uint startTime = havven.feePeriodStartTime() + havven.feePeriodDuration(); | |
motionStartTime[motionID] = startTime; | |
emit MotionBegun(msg.sender, target, motionID, startTime); | |
return motionID; | |
} | |
/** | |
* @notice Shared vote setup function between voteFor and voteAgainst. | |
* @return Returns the voter's vote weight. */ | |
function setupVote(uint motionID) | |
internal | |
returns (uint) | |
{ | |
/* There must be an active vote for this target running. | |
* Vote totals must only change during the voting phase. */ | |
require(motionVoting(motionID)); | |
/* The voter must not have an active vote this motion. */ | |
require(!hasVoted(msg.sender, motionID)); | |
/* The voter may not cast votes on themselves. */ | |
require(msg.sender != motionTarget[motionID]); | |
uint weight = havven.recomputeLastAverageBalance(msg.sender); | |
/* Users must have a nonzero voting weight to vote. */ | |
require(weight > 0); | |
voteWeight[msg.sender][motionID] = weight; | |
return weight; | |
} | |
/** | |
* @notice The sender casts a vote in favour of confiscation of the | |
* target account's nomin balance. | |
*/ | |
function voteFor(uint motionID) | |
external | |
{ | |
uint weight = setupVote(motionID); | |
vote[msg.sender][motionID] = Vote.Yea; | |
votesFor[motionID] = safeAdd(votesFor[motionID], weight); | |
emit VotedFor(msg.sender, motionID, weight); | |
} | |
/** | |
* @notice The sender casts a vote against confiscation of the | |
* target account's nomin balance. | |
*/ | |
function voteAgainst(uint motionID) | |
external | |
{ | |
uint weight = setupVote(motionID); | |
vote[msg.sender][motionID] = Vote.Nay; | |
votesAgainst[motionID] = safeAdd(votesAgainst[motionID], weight); | |
emit VotedAgainst(msg.sender, motionID, weight); | |
} | |
/** | |
* @notice Cancel an existing vote by the sender on a motion | |
* to confiscate the target balance. | |
*/ | |
function cancelVote(uint motionID) | |
external | |
{ | |
/* An account may cancel its vote either before the confirmation phase | |
* when the motion is still open, or after the confirmation phase, | |
* when the motion has concluded. | |
* But the totals must not change during the confirmation phase itself. */ | |
require(!motionConfirming(motionID)); | |
Vote senderVote = vote[msg.sender][motionID]; | |
/* If the sender has not voted then there is no need to update anything. */ | |
require(senderVote != Vote.Abstention); | |
/* If we are not voting, there is no reason to update the vote totals. */ | |
if (motionVoting(motionID)) { | |
if (senderVote == Vote.Yea) { | |
votesFor[motionID] = safeSub(votesFor[motionID], voteWeight[msg.sender][motionID]); | |
} else { | |
/* Since we already ensured that the vote is not an abstention, | |
* the only option remaining is Vote.Nay. */ | |
votesAgainst[motionID] = safeSub(votesAgainst[motionID], voteWeight[msg.sender][motionID]); | |
} | |
/* A cancelled vote is only meaningful if a vote is running. */ | |
emit VoteCancelled(msg.sender, motionID); | |
} | |
delete voteWeight[msg.sender][motionID]; | |
delete vote[msg.sender][motionID]; | |
} | |
/** | |
* @notice clear all data associated with a motionID for hygiene purposes. | |
*/ | |
function _closeMotion(uint motionID) | |
internal | |
{ | |
delete targetMotionID[motionTarget[motionID]]; | |
delete motionTarget[motionID]; | |
delete motionStartTime[motionID]; | |
delete votesFor[motionID]; | |
delete votesAgainst[motionID]; | |
emit MotionClosed(motionID); | |
} | |
/** | |
* @notice If a motion has concluded, or if it lasted its full duration but not passed, | |
* then anyone may close it. | |
*/ | |
function closeMotion(uint motionID) | |
external | |
{ | |
require((motionConfirming(motionID) && !motionPasses(motionID)) || motionWaiting(motionID)); | |
_closeMotion(motionID); | |
} | |
/** | |
* @notice The foundation may only confiscate a balance during the confirmation | |
* period after a motion has passed. | |
*/ | |
function approveMotion(uint motionID) | |
external | |
onlyOwner | |
{ | |
require(motionConfirming(motionID) && motionPasses(motionID)); | |
address target = motionTarget[motionID]; | |
nomin.freezeAndConfiscate(target); | |
_closeMotion(motionID); | |
emit MotionApproved(motionID); | |
} | |
/* @notice The foundation may veto a motion at any time. */ | |
function vetoMotion(uint motionID) | |
external | |
onlyOwner | |
{ | |
require(!motionWaiting(motionID)); | |
_closeMotion(motionID); | |
emit MotionVetoed(motionID); | |
} | |
/* ========== EVENTS ========== */ | |
event MotionBegun(address indexed initiator, address indexed target, uint indexed motionID, uint startTime); | |
event VotedFor(address indexed voter, uint indexed motionID, uint weight); | |
event VotedAgainst(address indexed voter, uint indexed motionID, uint weight); | |
event VoteCancelled(address indexed voter, uint indexed motionID); | |
event MotionClosed(uint indexed motionID); | |
event MotionVetoed(uint indexed motionID); | |
event MotionApproved(uint indexed motionID); | |
} | |
////////////////// contracts/Nomin.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: Nomin.sol | |
version: 1.2 | |
author: Anton Jurisevic | |
Mike Spain | |
Dominic Romanowski | |
Kevin Brown | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
---------------------------------------------------------------- - | |
Havven-backed nomin stablecoin contract. | |
This contract issues nomins, which are tokens worth 1 USD each. | |
Nomins are issuable by Havven holders who have to lock up some | |
value of their havvens to issue H * Cmax nomins. Where Cmax is | |
some value less than 1. | |
A configurable fee is charged on nomin transfers and deposited | |
into a common pot, which havven holders may withdraw from once per | |
fee period. | |
----------------------------------------------------------------- | |
*/ | |
contract Nomin is FeeToken { | |
/* ========== STATE VARIABLES ========== */ | |
// The address of the contract which manages confiscation votes. | |
Court public court; | |
Havven public havven; | |
// Accounts which have lost the privilege to transact in nomins. | |
mapping(address => bool) public frozen; | |
// Nomin transfers incur a 15 bp fee by default. | |
uint constant TRANSFER_FEE_RATE = 15 * UNIT / 10000; | |
string constant TOKEN_NAME = "Nomin USD"; | |
string constant TOKEN_SYMBOL = "nUSD"; | |
/* ========== CONSTRUCTOR ========== */ | |
constructor(address _proxy, Havven _havven, address _owner) | |
FeeToken(_proxy, TOKEN_NAME, TOKEN_SYMBOL, 0, // Zero nomins initially exist. | |
TRANSFER_FEE_RATE, | |
_havven, // The havven contract is the fee authority. | |
_owner) | |
public | |
{ | |
require(_proxy != 0 && address(_havven) != 0 && _owner != 0); | |
// It should not be possible to transfer to the nomin contract itself. | |
frozen[this] = true; | |
havven = _havven; | |
} | |
/* ========== SETTERS ========== */ | |
function setCourt(Court _court) | |
external | |
optionalProxy_onlyOwner | |
{ | |
court = _court; | |
emitCourtUpdated(_court); | |
} | |
function setHavven(Havven _havven) | |
external | |
optionalProxy_onlyOwner | |
{ | |
// havven should be set as the feeAuthority after calling this depending on | |
// havven's internal logic | |
havven = _havven; | |
setFeeAuthority(_havven); | |
emitHavvenUpdated(_havven); | |
} | |
/* ========== MUTATIVE FUNCTIONS ========== */ | |
/* Override ERC20 transfer function in order to check | |
* whether the recipient account is frozen. Note that there is | |
* no need to check whether the sender has a frozen account, | |
* since their funds have already been confiscated, | |
* and no new funds can be transferred to it.*/ | |
function transfer(address to, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
require(!frozen[to]); | |
return _transfer_byProxy(messageSender, to, value); | |
} | |
/* Override ERC20 transferFrom function in order to check | |
* whether the recipient account is frozen. */ | |
function transferFrom(address from, address to, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
require(!frozen[to]); | |
return _transferFrom_byProxy(messageSender, from, to, value); | |
} | |
function transferSenderPaysFee(address to, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
require(!frozen[to]); | |
return _transferSenderPaysFee_byProxy(messageSender, to, value); | |
} | |
function transferFromSenderPaysFee(address from, address to, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
require(!frozen[to]); | |
return _transferFromSenderPaysFee_byProxy(messageSender, from, to, value); | |
} | |
/* If a confiscation court motion has passed and reached the confirmation | |
* state, the court may transfer the target account's balance to the fee pool | |
* and freeze its participation in further transactions. */ | |
function freezeAndConfiscate(address target) | |
external | |
onlyCourt | |
{ | |
// A motion must actually be underway. | |
uint motionID = court.targetMotionID(target); | |
require(motionID != 0); | |
// These checks are strictly unnecessary, | |
// since they are already checked in the court contract itself. | |
require(court.motionConfirming(motionID)); | |
require(court.motionPasses(motionID)); | |
require(!frozen[target]); | |
// Confiscate the balance in the account and freeze it. | |
uint balance = tokenState.balanceOf(target); | |
tokenState.setBalanceOf(address(this), safeAdd(tokenState.balanceOf(address(this)), balance)); | |
tokenState.setBalanceOf(target, 0); | |
frozen[target] = true; | |
emitAccountFrozen(target, balance); | |
emitTransfer(target, address(this), balance); | |
} | |
/* The owner may allow a previously-frozen contract to once | |
* again accept and transfer nomins. */ | |
function unfreezeAccount(address target) | |
external | |
optionalProxy_onlyOwner | |
{ | |
require(frozen[target] && target != address(this)); | |
frozen[target] = false; | |
emitAccountUnfrozen(target); | |
} | |
/* Allow havven to issue a certain number of | |
* nomins from an account. */ | |
function issue(address account, uint amount) | |
external | |
onlyHavven | |
{ | |
tokenState.setBalanceOf(account, safeAdd(tokenState.balanceOf(account), amount)); | |
totalSupply = safeAdd(totalSupply, amount); | |
emitTransfer(address(0), account, amount); | |
emitIssued(account, amount); | |
} | |
/* Allow havven to burn a certain number of | |
* nomins from an account. */ | |
function burn(address account, uint amount) | |
external | |
onlyHavven | |
{ | |
tokenState.setBalanceOf(account, safeSub(tokenState.balanceOf(account), amount)); | |
totalSupply = safeSub(totalSupply, amount); | |
emitTransfer(account, address(0), amount); | |
emitBurned(account, amount); | |
} | |
/* ========== MODIFIERS ========== */ | |
modifier onlyHavven() { | |
require(Havven(msg.sender) == havven); | |
_; | |
} | |
modifier onlyCourt() { | |
require(Court(msg.sender) == court); | |
_; | |
} | |
/* ========== EVENTS ========== */ | |
event CourtUpdated(address newCourt); | |
bytes32 constant COURTUPDATED_SIG = keccak256("CourtUpdated(address)"); | |
function emitCourtUpdated(address newCourt) internal { | |
proxy._emit(abi.encode(newCourt), 1, COURTUPDATED_SIG, 0, 0, 0); | |
} | |
event HavvenUpdated(address newHavven); | |
bytes32 constant HAVVENUPDATED_SIG = keccak256("HavvenUpdated(address)"); | |
function emitHavvenUpdated(address newHavven) internal { | |
proxy._emit(abi.encode(newHavven), 1, HAVVENUPDATED_SIG, 0, 0, 0); | |
} | |
event AccountFrozen(address indexed target, uint balance); | |
bytes32 constant ACCOUNTFROZEN_SIG = keccak256("AccountFrozen(address,uint256)"); | |
function emitAccountFrozen(address target, uint balance) internal { | |
proxy._emit(abi.encode(balance), 2, ACCOUNTFROZEN_SIG, bytes32(target), 0, 0); | |
} | |
event AccountUnfrozen(address indexed target); | |
bytes32 constant ACCOUNTUNFROZEN_SIG = keccak256("AccountUnfrozen(address)"); | |
function emitAccountUnfrozen(address target) internal { | |
proxy._emit(abi.encode(), 2, ACCOUNTUNFROZEN_SIG, bytes32(target), 0, 0); | |
} | |
event Issued(address indexed account, uint amount); | |
bytes32 constant ISSUED_SIG = keccak256("Issued(address,uint256)"); | |
function emitIssued(address account, uint amount) internal { | |
proxy._emit(abi.encode(amount), 2, ISSUED_SIG, bytes32(account), 0, 0); | |
} | |
event Burned(address indexed account, uint amount); | |
bytes32 constant BURNED_SIG = keccak256("Burned(address,uint256)"); | |
function emitBurned(address account, uint amount) internal { | |
proxy._emit(abi.encode(amount), 2, BURNED_SIG, bytes32(account), 0, 0); | |
} | |
} | |
////////////////// contracts/LimitedSetup.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: LimitedSetup.sol | |
version: 1.1 | |
author: Anton Jurisevic | |
date: 2018-05-15 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
A contract with a limited setup period. Any function modified | |
with the setup modifier will cease to work after the | |
conclusion of the configurable-length post-construction setup period. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title Any function decorated with the modifier this contract provides | |
* deactivates after a specified setup period. | |
*/ | |
contract LimitedSetup { | |
uint setupExpiryTime; | |
/** | |
* @dev LimitedSetup Constructor. | |
* @param setupDuration The time the setup period will last for. | |
*/ | |
constructor(uint setupDuration) | |
public | |
{ | |
setupExpiryTime = now + setupDuration; | |
} | |
modifier onlyDuringSetup | |
{ | |
require(now < setupExpiryTime); | |
_; | |
} | |
} | |
////////////////// contracts/HavvenEscrow.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: HavvenEscrow.sol | |
version: 1.1 | |
author: Anton Jurisevic | |
Dominic Romanowski | |
Mike Spain | |
date: 2018-05-29 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
This contract allows the foundation to apply unique vesting | |
schedules to havven funds sold at various discounts in the token | |
sale. HavvenEscrow gives users the ability to inspect their | |
vested funds, their quantities and vesting dates, and to withdraw | |
the fees that accrue on those funds. | |
The fees are handled by withdrawing the entire fee allocation | |
for all havvens inside the escrow contract, and then allowing | |
the contract itself to subdivide that pool up proportionally within | |
itself. Every time the fee period rolls over in the main Havven | |
contract, the HavvenEscrow fee pool is remitted back into the | |
main fee pool to be redistributed in the next fee period. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title A contract to hold escrowed havvens and free them at given schedules. | |
*/ | |
contract HavvenEscrow is SafeDecimalMath, Owned, LimitedSetup(8 weeks) { | |
/* The corresponding Havven contract. */ | |
Havven public havven; | |
/* Lists of (timestamp, quantity) pairs per account, sorted in ascending time order. | |
* These are the times at which each given quantity of havvens vests. */ | |
mapping(address => uint[2][]) public vestingSchedules; | |
/* An account's total vested havven balance to save recomputing this for fee extraction purposes. */ | |
mapping(address => uint) public totalVestedAccountBalance; | |
/* The total remaining vested balance, for verifying the actual havven balance of this contract against. */ | |
uint public totalVestedBalance; | |
uint constant TIME_INDEX = 0; | |
uint constant QUANTITY_INDEX = 1; | |
/* Limit vesting entries to disallow unbounded iteration over vesting schedules. */ | |
uint constant MAX_VESTING_ENTRIES = 20; | |
/* ========== CONSTRUCTOR ========== */ | |
constructor(address _owner, Havven _havven) | |
Owned(_owner) | |
public | |
{ | |
havven = _havven; | |
} | |
/* ========== SETTERS ========== */ | |
function setHavven(Havven _havven) | |
external | |
onlyOwner | |
{ | |
havven = _havven; | |
emit HavvenUpdated(_havven); | |
} | |
/* ========== VIEW FUNCTIONS ========== */ | |
/** | |
* @notice A simple alias to totalVestedAccountBalance: provides ERC20 balance integration. | |
*/ | |
function balanceOf(address account) | |
public | |
view | |
returns (uint) | |
{ | |
return totalVestedAccountBalance[account]; | |
} | |
/** | |
* @notice The number of vesting dates in an account's schedule. | |
*/ | |
function numVestingEntries(address account) | |
public | |
view | |
returns (uint) | |
{ | |
return vestingSchedules[account].length; | |
} | |
/** | |
* @notice Get a particular schedule entry for an account. | |
* @return A pair of uints: (timestamp, havven quantity). | |
*/ | |
function getVestingScheduleEntry(address account, uint index) | |
public | |
view | |
returns (uint[2]) | |
{ | |
return vestingSchedules[account][index]; | |
} | |
/** | |
* @notice Get the time at which a given schedule entry will vest. | |
*/ | |
function getVestingTime(address account, uint index) | |
public | |
view | |
returns (uint) | |
{ | |
return getVestingScheduleEntry(account,index)[TIME_INDEX]; | |
} | |
/** | |
* @notice Get the quantity of havvens associated with a given schedule entry. | |
*/ | |
function getVestingQuantity(address account, uint index) | |
public | |
view | |
returns (uint) | |
{ | |
return getVestingScheduleEntry(account,index)[QUANTITY_INDEX]; | |
} | |
/** | |
* @notice Obtain the index of the next schedule entry that will vest for a given user. | |
*/ | |
function getNextVestingIndex(address account) | |
public | |
view | |
returns (uint) | |
{ | |
uint len = numVestingEntries(account); | |
for (uint i = 0; i < len; i++) { | |
if (getVestingTime(account, i) != 0) { | |
return i; | |
} | |
} | |
return len; | |
} | |
/** | |
* @notice Obtain the next schedule entry that will vest for a given user. | |
* @return A pair of uints: (timestamp, havven quantity). */ | |
function getNextVestingEntry(address account) | |
public | |
view | |
returns (uint[2]) | |
{ | |
uint index = getNextVestingIndex(account); | |
if (index == numVestingEntries(account)) { | |
return [uint(0), 0]; | |
} | |
return getVestingScheduleEntry(account, index); | |
} | |
/** | |
* @notice Obtain the time at which the next schedule entry will vest for a given user. | |
*/ | |
function getNextVestingTime(address account) | |
external | |
view | |
returns (uint) | |
{ | |
return getNextVestingEntry(account)[TIME_INDEX]; | |
} | |
/** | |
* @notice Obtain the quantity which the next schedule entry will vest for a given user. | |
*/ | |
function getNextVestingQuantity(address account) | |
external | |
view | |
returns (uint) | |
{ | |
return getNextVestingEntry(account)[QUANTITY_INDEX]; | |
} | |
/* ========== MUTATIVE FUNCTIONS ========== */ | |
/** | |
* @notice Withdraws a quantity of havvens back to the havven contract. | |
* @dev This may only be called by the owner during the contract's setup period. | |
*/ | |
function withdrawHavvens(uint quantity) | |
external | |
onlyOwner | |
onlyDuringSetup | |
{ | |
havven.transfer(havven, quantity); | |
} | |
/** | |
* @notice Destroy the vesting information associated with an account. | |
*/ | |
function purgeAccount(address account) | |
external | |
onlyOwner | |
onlyDuringSetup | |
{ | |
delete vestingSchedules[account]; | |
totalVestedBalance = safeSub(totalVestedBalance, totalVestedAccountBalance[account]); | |
delete totalVestedAccountBalance[account]; | |
} | |
/** | |
* @notice Add a new vesting entry at a given time and quantity to an account's schedule. | |
* @dev A call to this should be accompanied by either enough balance already available | |
* in this contract, or a corresponding call to havven.endow(), to ensure that when | |
* the funds are withdrawn, there is enough balance, as well as correctly calculating | |
* the fees. | |
* This may only be called by the owner during the contract's setup period. | |
* Note; although this function could technically be used to produce unbounded | |
* arrays, it's only in the foundation's command to add to these lists. | |
* @param account The account to append a new vesting entry to. | |
* @param time The absolute unix timestamp after which the vested quantity may be withdrawn. | |
* @param quantity The quantity of havvens that will vest. | |
*/ | |
function appendVestingEntry(address account, uint time, uint quantity) | |
public | |
onlyOwner | |
onlyDuringSetup | |
{ | |
/* No empty or already-passed vesting entries allowed. */ | |
require(now < time); | |
require(quantity != 0); | |
/* There must be enough balance in the contract to provide for the vesting entry. */ | |
totalVestedBalance = safeAdd(totalVestedBalance, quantity); | |
require(totalVestedBalance <= havven.balanceOf(this)); | |
/* Disallow arbitrarily long vesting schedules in light of the gas limit. */ | |
uint scheduleLength = vestingSchedules[account].length; | |
require(scheduleLength <= MAX_VESTING_ENTRIES); | |
if (scheduleLength == 0) { | |
totalVestedAccountBalance[account] = quantity; | |
} else { | |
/* Disallow adding new vested havvens earlier than the last one. | |
* Since entries are only appended, this means that no vesting date can be repeated. */ | |
require(getVestingTime(account, numVestingEntries(account) - 1) < time); | |
totalVestedAccountBalance[account] = safeAdd(totalVestedAccountBalance[account], quantity); | |
} | |
vestingSchedules[account].push([time, quantity]); | |
} | |
/** | |
* @notice Construct a vesting schedule to release a quantities of havvens | |
* over a series of intervals. | |
* @dev Assumes that the quantities are nonzero | |
* and that the sequence of timestamps is strictly increasing. | |
* This may only be called by the owner during the contract's setup period. | |
*/ | |
function addVestingSchedule(address account, uint[] times, uint[] quantities) | |
external | |
onlyOwner | |
onlyDuringSetup | |
{ | |
for (uint i = 0; i < times.length; i++) { | |
appendVestingEntry(account, times[i], quantities[i]); | |
} | |
} | |
/** | |
* @notice Allow a user to withdraw any havvens in their schedule that have vested. | |
*/ | |
function vest() | |
external | |
{ | |
uint numEntries = numVestingEntries(msg.sender); | |
uint total; | |
for (uint i = 0; i < numEntries; i++) { | |
uint time = getVestingTime(msg.sender, i); | |
/* The list is sorted; when we reach the first future time, bail out. */ | |
if (time > now) { | |
break; | |
} | |
uint qty = getVestingQuantity(msg.sender, i); | |
if (qty == 0) { | |
continue; | |
} | |
vestingSchedules[msg.sender][i] = [0, 0]; | |
total = safeAdd(total, qty); | |
} | |
if (total != 0) { | |
totalVestedBalance = safeSub(totalVestedBalance, total); | |
totalVestedAccountBalance[msg.sender] = safeSub(totalVestedAccountBalance[msg.sender], total); | |
havven.transfer(msg.sender, total); | |
emit Vested(msg.sender, now, total); | |
} | |
} | |
/* ========== EVENTS ========== */ | |
event HavvenUpdated(address newHavven); | |
event Vested(address indexed beneficiary, uint time, uint value); | |
} | |
////////////////// contracts/Havven.sol ////////////////// | |
/* | |
----------------------------------------------------------------- | |
FILE INFORMATION | |
----------------------------------------------------------------- | |
file: Havven.sol | |
version: 1.2 | |
author: Anton Jurisevic | |
Dominic Romanowski | |
date: 2018-05-15 | |
----------------------------------------------------------------- | |
MODULE DESCRIPTION | |
----------------------------------------------------------------- | |
Havven token contract. Havvens are transferable ERC20 tokens, | |
and also give their holders the following privileges. | |
An owner of havvens may participate in nomin confiscation votes, they | |
may also have the right to issue nomins at the discretion of the | |
foundation for this version of the contract. | |
After a fee period terminates, the duration and fees collected for that | |
period are computed, and the next period begins. Thus an account may only | |
withdraw the fees owed to them for the previous period, and may only do | |
so once per period. Any unclaimed fees roll over into the common pot for | |
the next period. | |
== Average Balance Calculations == | |
The fee entitlement of a havven holder is proportional to their average | |
issued nomin balance over the last fee period. This is computed by | |
measuring the area under the graph of a user's issued nomin balance over | |
time, and then when a new fee period begins, dividing through by the | |
duration of the fee period. | |
We need only update values when the balances of an account is modified. | |
This occurs when issuing or burning for issued nomin balances, | |
and when transferring for havven balances. This is for efficiency, | |
and adds an implicit friction to interacting with havvens. | |
A havven holder pays for his own recomputation whenever he wants to change | |
his position, which saves the foundation having to maintain a pot dedicated | |
to resourcing this. | |
A hypothetical user's balance history over one fee period, pictorially: | |
s ____ | |
| | | |
| |___ p | |
|____|___|___ __ _ _ | |
f t n | |
Here, the balance was s between times f and t, at which time a transfer | |
occurred, updating the balance to p, until n, when the present transfer occurs. | |
When a new transfer occurs at time n, the balance being p, | |
we must: | |
- Add the area p * (n - t) to the total area recorded so far | |
- Update the last transfer time to n | |
So if this graph represents the entire current fee period, | |
the average havvens held so far is ((t-f)*s + (n-t)*p) / (n-f). | |
The complementary computations must be performed for both sender and | |
recipient. | |
Note that a transfer keeps global supply of havvens invariant. | |
The sum of all balances is constant, and unmodified by any transfer. | |
So the sum of all balances multiplied by the duration of a fee period is also | |
constant, and this is equivalent to the sum of the area of every user's | |
time/balance graph. Dividing through by that duration yields back the total | |
havven supply. So, at the end of a fee period, we really do yield a user's | |
average share in the havven supply over that period. | |
A slight wrinkle is introduced if we consider the time r when the fee period | |
rolls over. Then the previous fee period k-1 is before r, and the current fee | |
period k is afterwards. If the last transfer took place before r, | |
but the latest transfer occurred afterwards: | |
k-1 | k | |
s __|_ | |
| | | | |
| | |____ p | |
|__|_|____|___ __ _ _ | |
| | |
f | t n | |
r | |
In this situation the area (r-f)*s contributes to fee period k-1, while | |
the area (t-r)*s contributes to fee period k. We will implicitly consider a | |
zero-value transfer to have occurred at time r. Their fee entitlement for the | |
previous period will be finalised at the time of their first transfer during the | |
current fee period, or when they query or withdraw their fee entitlement. | |
In the implementation, the duration of different fee periods may be slightly irregular, | |
as the check that they have rolled over occurs only when state-changing havven | |
operations are performed. | |
== Issuance and Burning == | |
In this version of the havven contract, nomins can only be issued by | |
those that have been nominated by the havven foundation. Nomins are assumed | |
to be valued at $1, as they are a stable unit of account. | |
All nomins issued require a proportional value of havvens to be locked, | |
where the proportion is governed by the current issuance ratio. This | |
means for every $1 of Havvens locked up, $(issuanceRatio) nomins can be issued. | |
i.e. to issue 100 nomins, 100/issuanceRatio dollars of havvens need to be locked up. | |
To determine the value of some amount of havvens(H), an oracle is used to push | |
the price of havvens (P_H) in dollars to the contract. The value of H | |
would then be: H * P_H. | |
Any havvens that are locked up by this issuance process cannot be transferred. | |
The amount that is locked floats based on the price of havvens. If the price | |
of havvens moves up, less havvens are locked, so they can be issued against, | |
or transferred freely. If the price of havvens moves down, more havvens are locked, | |
even going above the initial wallet balance. | |
----------------------------------------------------------------- | |
*/ | |
/** | |
* @title Havven ERC20 contract. | |
* @notice The Havven contracts does not only facilitate transfers and track balances, | |
* but it also computes the quantity of fees each havven holder is entitled to. | |
*/ | |
contract Havven is ExternStateToken { | |
/* ========== STATE VARIABLES ========== */ | |
/* A struct for handing values associated with average balance calculations */ | |
struct IssuanceData { | |
/* Sums of balances*duration in the current fee period. | |
/* range: decimals; units: havven-seconds */ | |
uint currentBalanceSum; | |
/* The last period's average balance */ | |
uint lastAverageBalance; | |
/* The last time the data was calculated */ | |
uint lastModified; | |
} | |
/* Issued nomin balances for individual fee entitlements */ | |
mapping(address => IssuanceData) public issuanceData; | |
/* The total number of issued nomins for determining fee entitlements */ | |
IssuanceData public totalIssuanceData; | |
/* The time the current fee period began */ | |
uint public feePeriodStartTime; | |
/* The time the last fee period began */ | |
uint public lastFeePeriodStartTime; | |
/* Fee periods will roll over in no shorter a time than this. | |
* The fee period cannot actually roll over until a fee-relevant | |
* operation such as withdrawal or a fee period duration update occurs, | |
* so this is just a target, and the actual duration may be slightly longer. */ | |
uint public feePeriodDuration = 4 weeks; | |
/* ...and must target between 1 day and six months. */ | |
uint constant MIN_FEE_PERIOD_DURATION = 1 days; | |
uint constant MAX_FEE_PERIOD_DURATION = 26 weeks; | |
/* The quantity of nomins that were in the fee pot at the time */ | |
/* of the last fee rollover, at feePeriodStartTime. */ | |
uint public lastFeesCollected; | |
/* Whether a user has withdrawn their last fees */ | |
mapping(address => bool) public hasWithdrawnFees; | |
Nomin public nomin; | |
HavvenEscrow public escrow; | |
/* The address of the oracle which pushes the havven price to this contract */ | |
address public oracle; | |
/* The price of havvens written in UNIT */ | |
uint public price; | |
/* The time the havven price was last updated */ | |
uint public lastPriceUpdateTime; | |
/* How long will the contract assume the price of havvens is correct */ | |
uint public priceStalePeriod = 3 hours; | |
/* A quantity of nomins greater than this ratio | |
* may not be issued against a given value of havvens. */ | |
uint public issuanceRatio = 5 * UNIT / 100; | |
/* No more nomins may be issued than the value of havvens backing them. */ | |
uint constant MAX_ISSUANCE_RATIO = UNIT; | |
/* Whether the address can issue nomins or not. */ | |
mapping(address => bool) public isIssuer; | |
/* The number of currently-outstanding nomins the user has issued. */ | |
mapping(address => uint) public nominsIssued; | |
uint constant HAVVEN_SUPPLY = 1e8 * UNIT; | |
uint constant ORACLE_FUTURE_LIMIT = 10 minutes; | |
string constant TOKEN_NAME = "Havven"; | |
string constant TOKEN_SYMBOL = "HAV"; | |
/* ========== CONSTRUCTOR ========== */ | |
/** | |
* @dev Constructor | |
* @param _tokenState A pre-populated contract containing token balances. | |
* If the provided address is 0x0, then a fresh one will be constructed with the contract owning all tokens. | |
* @param _owner The owner of this contract. | |
*/ | |
constructor(address _proxy, TokenState _tokenState, address _owner, address _oracle, uint _price) | |
ExternStateToken(_proxy, TOKEN_NAME, TOKEN_SYMBOL, HAVVEN_SUPPLY, _tokenState, _owner) | |
/* Owned is initialised in ExternStateToken */ | |
public | |
{ | |
oracle = _oracle; | |
feePeriodStartTime = now; | |
lastFeePeriodStartTime = now - feePeriodDuration; | |
price = _price; | |
lastPriceUpdateTime = now; | |
} | |
/* ========== SETTERS ========== */ | |
/** | |
* @notice Set the associated Nomin contract to collect fees from. | |
* @dev Only the contract owner may call this. | |
*/ | |
function setNomin(Nomin _nomin) | |
external | |
optionalProxy_onlyOwner | |
{ | |
nomin = _nomin; | |
emitNominUpdated(_nomin); | |
} | |
/** | |
* @notice Set the associated havven escrow contract. | |
* @dev Only the contract owner may call this. | |
*/ | |
function setEscrow(HavvenEscrow _escrow) | |
external | |
optionalProxy_onlyOwner | |
{ | |
escrow = _escrow; | |
emitEscrowUpdated(_escrow); | |
} | |
/** | |
* @notice Set the targeted fee period duration. | |
* @dev Only callable by the contract owner. The duration must fall within | |
* acceptable bounds (1 day to 26 weeks). Upon resetting this the fee period | |
* may roll over if the target duration was shortened sufficiently. | |
*/ | |
function setFeePeriodDuration(uint duration) | |
external | |
optionalProxy_onlyOwner | |
{ | |
require(MIN_FEE_PERIOD_DURATION <= duration && | |
duration <= MAX_FEE_PERIOD_DURATION); | |
feePeriodDuration = duration; | |
emitFeePeriodDurationUpdated(duration); | |
rolloverFeePeriodIfElapsed(); | |
} | |
/** | |
* @notice Set the Oracle that pushes the havven price to this contract | |
*/ | |
function setOracle(address _oracle) | |
external | |
optionalProxy_onlyOwner | |
{ | |
oracle = _oracle; | |
emitOracleUpdated(_oracle); | |
} | |
/** | |
* @notice Set the stale period on the updated havven price | |
* @dev No max/minimum, as changing it wont influence anything but issuance by the foundation | |
*/ | |
function setPriceStalePeriod(uint time) | |
external | |
optionalProxy_onlyOwner | |
{ | |
priceStalePeriod = time; | |
} | |
/** | |
* @notice Set the issuanceRatio for issuance calculations. | |
* @dev Only callable by the contract owner. | |
*/ | |
function setIssuanceRatio(uint _issuanceRatio) | |
external | |
optionalProxy_onlyOwner | |
{ | |
require(_issuanceRatio <= MAX_ISSUANCE_RATIO); | |
issuanceRatio = _issuanceRatio; | |
emitIssuanceRatioUpdated(_issuanceRatio); | |
} | |
/** | |
* @notice Set whether the specified can issue nomins or not. | |
*/ | |
function setIssuer(address account, bool value) | |
external | |
optionalProxy_onlyOwner | |
{ | |
isIssuer[account] = value; | |
emitIssuersUpdated(account, value); | |
} | |
/* ========== VIEWS ========== */ | |
function issuanceCurrentBalanceSum(address account) | |
external | |
view | |
returns (uint) | |
{ | |
return issuanceData[account].currentBalanceSum; | |
} | |
function issuanceLastAverageBalance(address account) | |
external | |
view | |
returns (uint) | |
{ | |
return issuanceData[account].lastAverageBalance; | |
} | |
function issuanceLastModified(address account) | |
external | |
view | |
returns (uint) | |
{ | |
return issuanceData[account].lastModified; | |
} | |
function totalIssuanceCurrentBalanceSum() | |
external | |
view | |
returns (uint) | |
{ | |
return totalIssuanceData.currentBalanceSum; | |
} | |
function totalIssuanceLastAverageBalance() | |
external | |
view | |
returns (uint) | |
{ | |
return totalIssuanceData.lastAverageBalance; | |
} | |
function totalIssuanceLastModified() | |
external | |
view | |
returns (uint) | |
{ | |
return totalIssuanceData.lastModified; | |
} | |
/* ========== MUTATIVE FUNCTIONS ========== */ | |
/** | |
* @notice ERC20 transfer function. | |
*/ | |
function transfer(address to, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
address sender = messageSender; | |
/* If they have enough available Havvens, it could be that | |
* their havvens are escrowed, however the transfer would then | |
* fail. This means that escrowed havvens are locked first, | |
* and then the actual transferable ones. */ | |
require(nominsIssued[sender] == 0 || value <= availableHavvens(sender)); | |
/* Perform the transfer: if there is a problem, | |
* an exception will be thrown in this call. */ | |
_transfer_byProxy(sender, to, value); | |
return true; | |
} | |
/** | |
* @notice ERC20 transferFrom function. | |
*/ | |
function transferFrom(address from, address to, uint value) | |
public | |
optionalProxy | |
returns (bool) | |
{ | |
address sender = messageSender; | |
require(nominsIssued[sender] == 0 || value <= availableHavvens(from)); | |
/* Perform the transfer: if there is a problem, | |
* an exception will be thrown in this call. */ | |
_transferFrom_byProxy(sender, from, to, value); | |
return true; | |
} | |
/** | |
* @notice Compute the last period's fee entitlement for the message sender | |
* and then deposit it into their nomin account. | |
*/ | |
function withdrawFees() | |
public | |
optionalProxy | |
{ | |
address sender = messageSender; | |
rolloverFeePeriodIfElapsed(); | |
/* Do not deposit fees into frozen accounts. */ | |
require(!nomin.frozen(sender)); | |
/* Check the period has rolled over first. */ | |
updateIssuanceData(sender, nominsIssued[sender], nomin.totalSupply()); | |
/* Only allow accounts to withdraw fees once per period. */ | |
require(!hasWithdrawnFees[sender]); | |
uint feesOwed; | |
uint lastTotalIssued = totalIssuanceData.lastAverageBalance; | |
if (lastTotalIssued > 0) { | |
/* Sender receives a share of last period's collected fees proportional | |
* with their average fraction of the last period's issued nomins. */ | |
feesOwed = safeDiv_dec( | |
safeMul_dec(issuanceData[sender].lastAverageBalance, lastFeesCollected), | |
lastTotalIssued | |
); | |
} | |
hasWithdrawnFees[sender] = true; | |
if (feesOwed != 0) { | |
nomin.withdrawFees(sender, feesOwed); | |
} | |
emitFeesWithdrawn(messageSender, feesOwed); | |
} | |
/** | |
* @notice Update the havven balance averages since the last transfer | |
* or entitlement adjustment. | |
* @dev Since this updates the last transfer timestamp, if invoked | |
* consecutively, this function will do nothing after the first call. | |
* Also, this will adjust the total issuance at the same time. | |
*/ | |
function updateIssuanceData(address account, uint preBalance, uint lastTotalSupply) | |
internal | |
{ | |
/* update the total balances first */ | |
totalIssuanceData = updatedIssuanceData(lastTotalSupply, totalIssuanceData); | |
if (issuanceData[account].lastModified < feePeriodStartTime) { | |
hasWithdrawnFees[account] = false; | |
} | |
issuanceData[account] = updatedIssuanceData(preBalance, issuanceData[account]); | |
} | |
/** | |
* @notice Compute the new IssuanceData on the old balance | |
*/ | |
function updatedIssuanceData(uint preBalance, IssuanceData preIssuance) | |
internal | |
view | |
returns (IssuanceData) | |
{ | |
uint currentBalanceSum = preIssuance.currentBalanceSum; | |
uint lastAverageBalance = preIssuance.lastAverageBalance; | |
uint lastModified = preIssuance.lastModified; | |
if (lastModified < feePeriodStartTime) { | |
if (lastModified < lastFeePeriodStartTime) { | |
/* The balance was last updated before the previous fee period, so the average | |
* balance in this period is their pre-transfer balance. */ | |
lastAverageBalance = preBalance; | |
} else { | |
/* The balance was last updated during the previous fee period. */ | |
/* No overflow or zero denominator problems, since lastFeePeriodStartTime < feePeriodStartTime < lastModified. | |
* implies these quantities are strictly positive. */ | |
uint timeUpToRollover = feePeriodStartTime - lastModified; | |
uint lastFeePeriodDuration = feePeriodStartTime - lastFeePeriodStartTime; | |
uint lastBalanceSum = safeAdd(currentBalanceSum, safeMul(preBalance, timeUpToRollover)); | |
lastAverageBalance = lastBalanceSum / lastFeePeriodDuration; | |
} | |
/* Roll over to the next fee period. */ | |
currentBalanceSum = safeMul(preBalance, now - feePeriodStartTime); | |
} else { | |
/* The balance was last updated during the current fee period. */ | |
currentBalanceSum = safeAdd( | |
currentBalanceSum, | |
safeMul(preBalance, now - lastModified) | |
); | |
} | |
return IssuanceData(currentBalanceSum, lastAverageBalance, now); | |
} | |
/** | |
* @notice Recompute and return the given account's last average balance. | |
*/ | |
function recomputeLastAverageBalance(address account) | |
external | |
returns (uint) | |
{ | |
updateIssuanceData(account, nominsIssued[account], nomin.totalSupply()); | |
return issuanceData[account].lastAverageBalance; | |
} | |
/** | |
* @notice Issue nomins against the sender's havvens. | |
* @dev Issuance is only allowed if the havven price isn't stale and the sender is an issuer. | |
*/ | |
function issueNomins(uint amount) | |
public | |
optionalProxy | |
requireIssuer(messageSender) | |
/* No need to check if price is stale, as it is checked in issuableNomins. */ | |
{ | |
address sender = messageSender; | |
require(amount <= remainingIssuableNomins(sender)); | |
uint lastTot = nomin.totalSupply(); | |
uint preIssued = nominsIssued[sender]; | |
nomin.issue(sender, amount); | |
nominsIssued[sender] = safeAdd(preIssued, amount); | |
updateIssuanceData(sender, preIssued, lastTot); | |
} | |
function issueMaxNomins() | |
external | |
optionalProxy | |
{ | |
issueNomins(remainingIssuableNomins(messageSender)); | |
} | |
/** | |
* @notice Burn nomins to clear issued nomins/free havvens. | |
*/ | |
function burnNomins(uint amount) | |
/* it doesn't matter if the price is stale or if the user is an issuer, as non-issuers have issued no nomins.*/ | |
external | |
optionalProxy | |
{ | |
address sender = messageSender; | |
uint lastTot = nomin.totalSupply(); | |
uint preIssued = nominsIssued[sender]; | |
/* nomin.burn does a safeSub on balance (so it will revert if there are not enough nomins). */ | |
nomin.burn(sender, amount); | |
/* This safe sub ensures amount <= number issued */ | |
nominsIssued[sender] = safeSub(preIssued, amount); | |
updateIssuanceData(sender, preIssued, lastTot); | |
} | |
/** | |
* @notice Check if the fee period has rolled over. If it has, set the new fee period start | |
* time, and record the fees collected in the nomin contract. | |
*/ | |
function rolloverFeePeriodIfElapsed() | |
public | |
{ | |
/* If the fee period has rolled over... */ | |
if (now >= feePeriodStartTime + feePeriodDuration) { | |
lastFeesCollected = nomin.feePool(); | |
lastFeePeriodStartTime = feePeriodStartTime; | |
feePeriodStartTime = now; | |
emitFeePeriodRollover(now); | |
} | |
} | |
/* ========== Issuance/Burning ========== */ | |
/** | |
* @notice The maximum nomins an issuer can issue against their total havven quantity. This ignores any | |
* already issued nomins. | |
*/ | |
function maxIssuableNomins(address issuer) | |
view | |
public | |
priceNotStale | |
returns (uint) | |
{ | |
if (!isIssuer[issuer]) { | |
return 0; | |
} | |
if (escrow != HavvenEscrow(0)) { | |
uint totalOwnedHavvens = safeAdd(tokenState.balanceOf(issuer), escrow.balanceOf(issuer)); | |
return safeMul_dec(HAVtoUSD(totalOwnedHavvens), issuanceRatio); | |
} else { | |
return safeMul_dec(HAVtoUSD(tokenState.balanceOf(issuer)), issuanceRatio); | |
} | |
} | |
/** | |
* @notice The remaining nomins an issuer can issue against their total havven quantity. | |
*/ | |
function remainingIssuableNomins(address issuer) | |
view | |
public | |
returns (uint) | |
{ | |
uint issued = nominsIssued[issuer]; | |
uint max = maxIssuableNomins(issuer); | |
if (issued > max) { | |
return 0; | |
} else { | |
return max - issued; | |
} | |
} | |
/** | |
* @notice Havvens that are locked, which can exceed the user's total balance + escrowed | |
*/ | |
function lockedHavvens(address account) | |
public | |
view | |
returns (uint) | |
{ | |
if (nominsIssued[account] == 0) { | |
return 0; | |
} | |
return USDtoHAV(safeDiv_dec(nominsIssued[account], issuanceRatio)); | |
} | |
/** | |
* @notice Havvens that are not locked, available for issuance | |
*/ | |
function availableHavvens(address account) | |
public | |
view | |
returns (uint) | |
{ | |
uint locked = lockedHavvens(account); | |
uint bal = tokenState.balanceOf(account); | |
if (escrow != address(0)) { | |
bal += escrow.balanceOf(account); | |
} | |
if (locked > bal) { | |
return 0; | |
} | |
return bal - locked; | |
} | |
/** | |
* @notice The value in USD for a given amount of HAV | |
*/ | |
function HAVtoUSD(uint hav_dec) | |
public | |
view | |
priceNotStale | |
returns (uint) | |
{ | |
return safeMul_dec(hav_dec, price); | |
} | |
/** | |
* @notice The value in HAV for a given amount of USD | |
*/ | |
function USDtoHAV(uint usd_dec) | |
public | |
view | |
priceNotStale | |
returns (uint) | |
{ | |
return safeDiv_dec(usd_dec, price); | |
} | |
/** | |
* @notice Access point for the oracle to update the price of havvens. | |
*/ | |
function updatePrice(uint newPrice, uint timeSent) | |
external | |
onlyOracle /* Should be callable only by the oracle. */ | |
{ | |
/* Must be the most recently sent price, but not too far in the future. | |
* (so we can't lock ourselves out of updating the oracle for longer than this) */ | |
require(lastPriceUpdateTime < timeSent && timeSent < now + ORACLE_FUTURE_LIMIT); | |
price = newPrice; | |
lastPriceUpdateTime = timeSent; | |
emitPriceUpdated(newPrice, timeSent); | |
/* Check the fee period rollover within this as the price should be pushed every 15min. */ | |
rolloverFeePeriodIfElapsed(); | |
} | |
/** | |
* @notice Check if the price of havvens hasn't been updated for longer than the stale period. | |
*/ | |
function priceIsStale() | |
public | |
view | |
returns (bool) | |
{ | |
return safeAdd(lastPriceUpdateTime, priceStalePeriod) < now; | |
} | |
/* ========== MODIFIERS ========== */ | |
modifier requireIssuer(address account) | |
{ | |
require(isIssuer[account]); | |
_; | |
} | |
modifier onlyOracle | |
{ | |
require(msg.sender == oracle); | |
_; | |
} | |
modifier priceNotStale | |
{ | |
require(!priceIsStale()); | |
_; | |
} | |
/* ========== EVENTS ========== */ | |
event PriceUpdated(uint newPrice, uint timestamp); | |
bytes32 constant PRICEUPDATED_SIG = keccak256("PriceUpdated(uint256,uint256)"); | |
function emitPriceUpdated(uint newPrice, uint timestamp) internal { | |
proxy._emit(abi.encode(newPrice, timestamp), 1, PRICEUPDATED_SIG, 0, 0, 0); | |
} | |
event IssuanceRatioUpdated(uint newRatio); | |
bytes32 constant ISSUANCERATIOUPDATED_SIG = keccak256("IssuanceRatioUpdated(uint256)"); | |
function emitIssuanceRatioUpdated(uint newRatio) internal { | |
proxy._emit(abi.encode(newRatio), 1, ISSUANCERATIOUPDATED_SIG, 0, 0, 0); | |
} | |
event FeePeriodRollover(uint timestamp); | |
bytes32 constant FEEPERIODROLLOVER_SIG = keccak256("FeePeriodRollover(uint256)"); | |
function emitFeePeriodRollover(uint timestamp) internal { | |
proxy._emit(abi.encode(timestamp), 1, FEEPERIODROLLOVER_SIG, 0, 0, 0); | |
} | |
event FeePeriodDurationUpdated(uint duration); | |
bytes32 constant FEEPERIODDURATIONUPDATED_SIG = keccak256("FeePeriodDurationUpdated(uint256)"); | |
function emitFeePeriodDurationUpdated(uint duration) internal { | |
proxy._emit(abi.encode(duration), 1, FEEPERIODDURATIONUPDATED_SIG, 0, 0, 0); | |
} | |
event FeesWithdrawn(address indexed account, uint value); | |
bytes32 constant FEESWITHDRAWN_SIG = keccak256("FeesWithdrawn(address,uint256)"); | |
function emitFeesWithdrawn(address account, uint value) internal { | |
proxy._emit(abi.encode(value), 2, FEESWITHDRAWN_SIG, bytes32(account), 0, 0); | |
} | |
event OracleUpdated(address newOracle); | |
bytes32 constant ORACLEUPDATED_SIG = keccak256("OracleUpdated(address)"); | |
function emitOracleUpdated(address newOracle) internal { | |
proxy._emit(abi.encode(newOracle), 1, ORACLEUPDATED_SIG, 0, 0, 0); | |
} | |
event NominUpdated(address newNomin); | |
bytes32 constant NOMINUPDATED_SIG = keccak256("NominUpdated(address)"); | |
function emitNominUpdated(address newNomin) internal { | |
proxy._emit(abi.encode(newNomin), 1, NOMINUPDATED_SIG, 0, 0, 0); | |
} | |
event EscrowUpdated(address newEscrow); | |
bytes32 constant ESCROWUPDATED_SIG = keccak256("EscrowUpdated(address)"); | |
function emitEscrowUpdated(address newEscrow) internal { | |
proxy._emit(abi.encode(newEscrow), 1, ESCROWUPDATED_SIG, 0, 0, 0); | |
} | |
event IssuersUpdated(address indexed account, bool indexed value); | |
bytes32 constant ISSUERSUPDATED_SIG = keccak256("IssuersUpdated(address,bool)"); | |
function emitIssuersUpdated(address account, bool value) internal { | |
proxy._emit(abi.encode(), 3, ISSUERSUPDATED_SIG, bytes32(account), bytes32(value ? 1 : 0), 0); | |
} | |
} |
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