BondToken

This contract implements a bond token with upgradeable capabilities, access control, and pausability. It includes functionality for managing indexed user assets and global asset pools.

State Variables

globalPool

The global asset pool

IndexedGlobalAssetPool public globalPool;

userAssets

Mapping of user addresses to their indexed assets

mapping(address => IndexedUserAssets) public userAssets;

MINTER_ROLE

Role identifier for accounts with minting privileges

bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

GOV_ROLE

Role identifier for accounts with governance privileges

bytes32 public constant GOV_ROLE = keccak256("GOV_ROLE");

DISTRIBUTOR_ROLE

Role identifier for the distributor

bytes32 public constant DISTRIBUTOR_ROLE = keccak256("DISTRIBUTOR_ROLE");

SHARES_DECIMALS

The number of decimals for shares

uint8 public constant SHARES_DECIMALS = 6;

Functions

constructor

Note: constructor

constructor();

initialize

Initializes the contract with a name, symbol, minter, governance address, distributor, and initial shares per token.

function initialize(
    string memory name,
    string memory symbol,
    address minter,
    address governance,
    uint256 sharesPerToken
) public initializer;

Parameters

Name	Type	Description
name	string	The name of the token
symbol	string	The symbol of the token
minter	address	The address that will have minting privileges
governance	address	The address that will have governance privileges
sharesPerToken	uint256	The initial number of shares per token

mint

Can only be called by addresses with the MINTER_ROLE.

Mints new tokens to the specified address.

function mint(address to, uint256 amount) public onlyRole(MINTER_ROLE);

Parameters

Name	Type	Description
to	address	The address that will receive the minted tokens
amount	uint256	The amount of tokens to mint

burn

Can only be called by addresses with the MINTER_ROLE.

Burns tokens from the specified account.

function burn(address account, uint256 amount) public onlyRole(MINTER_ROLE);

Parameters

Name	Type	Description
account	address	The account from which tokens will be burned
amount	uint256	The amount of tokens to burn

getPreviousPoolAmounts

Returns the previous pool amounts from the global pool.

function getPreviousPoolAmounts() external view returns (PoolAmount[] memory);

Returns

Name	Type	Description
<none>	PoolAmount[]	An array of PoolAmount structs representing the previous pool amounts

_update

This function is called during token transfer and is paused when the contract is paused.

Internal function to update user assets after a transfer.

function _update(address from, address to, uint256 amount) internal virtual override whenNotPaused;

Parameters

Name	Type	Description
from	address	The address tokens are transferred from
to	address	The address tokens are transferred to
amount	uint256	The amount of tokens transferred

updateIndexedUserAssets

This function updates the number of shares held by the user based on the current period.

Updates the indexed user assets for a specific user.

function updateIndexedUserAssets(address user, uint256 balance) internal;

Parameters

Name	Type	Description
user	address	The address of the user
balance	uint256	The current balance of the user

getIndexedUserAmount

This function calculates the number of shares based on the current period and the previous pool amounts.

Returns the indexed amount of shares for a specific user.

function getIndexedUserAmount(address user, uint256 balance, uint256 period) public view returns (uint256);

Parameters

Name	Type	Description
user	address	The address of the user
balance	uint256	The current balance of the user
period	uint256	The period to calculate the shares for

Returns

Name	Type	Description
<none>	uint256	The indexed amount of shares for the user

resetIndexedUserAssets

This function resets the last updated period and indexed amount of shares to zero. Can only be called by addresses with the DISTRIBUTOR_ROLE and when the contract is not paused.

Resets the indexed user assets for a specific user.

function resetIndexedUserAssets(address user) external onlyRole(DISTRIBUTOR_ROLE) whenNotPaused;

Parameters

Name	Type	Description
user	address	The address of the user

increaseIndexedAssetPeriod

Can only be called by addresses with the GOV_ROLE and when the contract is not paused.

Increases the current period and updates the shares per token.

function increaseIndexedAssetPeriod(uint256 sharesPerToken) public onlyRole(DISTRIBUTOR_ROLE) whenNotPaused;

Parameters

grantRole

Can only be called by addresses with the GOV_ROLE.

Grants a role to an account.

function grantRole(bytes32 role, address account) public virtual override onlyRole(GOV_ROLE);

Parameters

revokeRole

Can only be called by addresses with the GOV_ROLE.

Revokes a role from an account.

function revokeRole(bytes32 role, address account) public virtual override onlyRole(GOV_ROLE);

Parameters

pause

Can only be called by addresses with the GOV_ROLE.

Pauses all contract functions except for upgrades.

function pause() external onlyRole(GOV_ROLE);

unpause

Can only be called by addresses with the GOV_ROLE.

Unpauses all contract functions.

function unpause() external onlyRole(GOV_ROLE);

_authorizeUpgrade

Can only be called by addresses with the GOV_ROLE.

Function that should revert when msg.sender is not authorized to upgrade the contract. Called by {upgradeTo} and {upgradeToAndCall}.

function _authorizeUpgrade(address newImplementation) internal override onlyRole(GOV_ROLE);

Parameters

Events

IncreasedAssetPeriod

Emitted when the asset period is increased

event IncreasedAssetPeriod(uint256 currentPeriod, uint256 sharesPerToken);

UpdatedUserAssets

Emitted when a user's assets are updated

event UpdatedUserAssets(address user, uint256 lastUpdatedPeriod, uint256 indexedAmountShares);

Structs

PoolAmount

Struct to represent a pool's outstanding shares and shares per bond at a specific period

struct PoolAmount {
    uint256 period;
    uint256 amount;
    uint256 sharesPerToken;
}

Properties

IndexedGlobalAssetPool

Struct to represent the global asset pool, including the current period, shares per token, and previous pool amounts.

struct IndexedGlobalAssetPool {
    uint256 currentPeriod;
    uint256 sharesPerToken;
    PoolAmount[] previousPoolAmounts;
}

Properties

IndexedUserAssets

Struct to represent a user's indexed assets, which are the user's shares

struct IndexedUserAssets {
    uint256 lastUpdatedPeriod;
    uint256 indexedAmountShares;
}

Properties