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Function hooks in Solidity
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contract Function_hook_example { | |
function Function_hook_example() { | |
owner = msg.sender; | |
} | |
modifier isOwner { | |
if (msg.sender == owner) { | |
_ | |
} | |
} | |
//do a hook after normal exeuction. | |
modifier post_hook { | |
_ | |
if (post_function_hooks[msg.sig] != 0x0) { | |
post_function_hooks[msg.sig].call(msg.data); | |
} | |
} | |
//do a hook before normal execution. | |
modifier pre_hook { | |
if (pre_function_hooks[msg.sig] != 0x0) { | |
pre_function_hooks[msg.sig].call(msg.data); | |
} | |
_ | |
} | |
function doSomething(bytes32 _text) pre_hook post_hook { | |
//do basic stuff here. | |
} | |
function changeOwner(address _newOwner) isOwner { | |
owner = _newOwner; | |
} | |
function changeHook(bytes32 _type, bytes4 _functionSig, address _contract) isOwner { | |
if (_type == "pre") { | |
pre_function_hooks[_functionSig] = _contract; | |
} else if (_type == "post") { | |
post_function_hooks[_functionSig] = _contract; | |
} | |
} | |
address public owner; | |
mapping (bytes4 => address) pre_function_hooks; | |
mapping (bytes4 => address) post_function_hooks; | |
} | |
contract otherContract { | |
//called from hook example. | |
function doSomething(bytes32 _text) { | |
//do extra stuff here. Use _text or not. | |
//ie, notify etherex of a deposit. | |
} | |
} |
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