BaseHook

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Inherits: IHooks, SafeCallback

abstract contract for hook implementations

Functions

constructor

constructor(IPoolManager _manager) SafeCallback(_manager);

selfOnly

Only this address may call this function

modifier selfOnly();

onlyValidPools

Only pools with hooks set to this contract may call this function

modifier onlyValidPools(IHooks hooks);

getHookPermissions

Returns a struct of permissions to signal which hook functions are to be implemented

Used at deployment to validate the address correctly represents the expected permissions

function getHookPermissions() public pure virtual returns (Hooks.Permissions memory);

validateHookAddress

Validates the deployed hook address agrees with the expected permissions of the hook

this function is virtual so that we can override it during testing, which allows us to deploy an implementation to any address and then etch the bytecode into the correct address

function validateHookAddress(BaseHook _this) internal pure virtual;

_unlockCallback

function _unlockCallback(bytes calldata data) internal virtual override returns (bytes memory);

beforeInitialize

The hook called before the state of a pool is initialized

function beforeInitialize(address, PoolKey calldata, uint160) external virtual returns (bytes4);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	uint160

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook

afterInitialize

The hook called after the state of a pool is initialized

function afterInitialize(address, PoolKey calldata, uint160, int24) external virtual returns (bytes4);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	uint160
<none>	int24

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook

beforeAddLiquidity

The hook called before liquidity is added

function beforeAddLiquidity(address, PoolKey calldata, IPoolManager.ModifyLiquidityParams calldata, bytes calldata)
    external
    virtual
    returns (bytes4);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	IPoolManager.ModifyLiquidityParams
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook

beforeRemoveLiquidity

The hook called before liquidity is removed

function beforeRemoveLiquidity(address, PoolKey calldata, IPoolManager.ModifyLiquidityParams calldata, bytes calldata)
    external
    virtual
    returns (bytes4);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	IPoolManager.ModifyLiquidityParams
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook

afterAddLiquidity

The hook called after liquidity is added

function afterAddLiquidity(
    address,
    PoolKey calldata,
    IPoolManager.ModifyLiquidityParams calldata,
    BalanceDelta,
    BalanceDelta,
    bytes calldata
) external virtual returns (bytes4, BalanceDelta);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	IPoolManager.ModifyLiquidityParams
<none>	BalanceDelta
<none>	BalanceDelta
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook
<none>	BalanceDelta	BalanceDelta The hook's delta in token0 and token1. Positive: the hook is owed/took currency, negative: the hook owes/sent currency

afterRemoveLiquidity

The hook called after liquidity is removed

function afterRemoveLiquidity(
    address,
    PoolKey calldata,
    IPoolManager.ModifyLiquidityParams calldata,
    BalanceDelta,
    BalanceDelta,
    bytes calldata
) external virtual returns (bytes4, BalanceDelta);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	IPoolManager.ModifyLiquidityParams
<none>	BalanceDelta
<none>	BalanceDelta
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook
<none>	BalanceDelta	BalanceDelta The hook's delta in token0 and token1. Positive: the hook is owed/took currency, negative: the hook owes/sent currency

beforeSwap

The hook called before a swap

function beforeSwap(address, PoolKey calldata, IPoolManager.SwapParams calldata, bytes calldata)
    external
    virtual
    returns (bytes4, BeforeSwapDelta, uint24);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	IPoolManager.SwapParams
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook
<none>	BeforeSwapDelta	BeforeSwapDelta The hook's delta in specified and unspecified currencies. Positive: the hook is owed/took currency, negative: the hook owes/sent currency
<none>	uint24	uint24 Optionally override the lp fee, only used if three conditions are met: 1. the Pool has a dynamic fee, 2. the value's 2nd highest bit is set (23rd bit, 0x400000), and 3. the value is less than or equal to the maximum fee (1 million)

afterSwap

The hook called after a swap

function afterSwap(address, PoolKey calldata, IPoolManager.SwapParams calldata, BalanceDelta, bytes calldata)
    external
    virtual
    returns (bytes4, int128);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	IPoolManager.SwapParams
<none>	BalanceDelta
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook
<none>	int128	int128 The hook's delta in unspecified currency. Positive: the hook is owed/took currency, negative: the hook owes/sent currency

beforeDonate

The hook called before donate

function beforeDonate(address, PoolKey calldata, uint256, uint256, bytes calldata) external virtual returns (bytes4);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	uint256
<none>	uint256
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook

afterDonate

The hook called after donate

function afterDonate(address, PoolKey calldata, uint256, uint256, bytes calldata) external virtual returns (bytes4);

Parameters

Name	Type	Description
<none>	address
<none>	PoolKey
<none>	uint256
<none>	uint256
<none>	bytes

Returns

Name	Type	Description
<none>	bytes4	bytes4 The function selector for the hook

Errors

NotSelf

error NotSelf();

InvalidPool

error InvalidPool();

LockFailure

error LockFailure();

HookNotImplemented

error HookNotImplemented();