58 lines
1.3 KiB
Solidity
58 lines
1.3 KiB
Solidity
pragma solidity ^0.5.0;
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import "../access/roles/PauserRole.sol";
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/**
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* @title Pausable
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* @dev Base contract which allows children to implement an emergency stop mechanism.
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*/
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contract Pausable is PauserRole {
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event Paused(address account);
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event Unpaused(address account);
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bool private _paused;
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constructor () internal {
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_paused = false;
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}
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/**
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* @return True if the contract is paused, false otherwise.
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*/
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function paused() public view returns (bool) {
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return _paused;
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}
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/**
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* @dev Modifier to make a function callable only when the contract is not paused.
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*/
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modifier whenNotPaused() {
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require(!_paused, "Pausable: paused");
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_;
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}
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/**
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* @dev Modifier to make a function callable only when the contract is paused.
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*/
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modifier whenPaused() {
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require(_paused, "Pausable: not paused");
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_;
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}
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/**
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* @dev Called by a pauser to pause, triggers stopped state.
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*/
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function pause() public onlyPauser whenNotPaused {
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_paused = true;
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emit Paused(msg.sender);
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}
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/**
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* @dev Called by a pauser to unpause, returns to normal state.
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*/
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function unpause() public onlyPauser whenPaused {
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_paused = false;
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emit Unpaused(msg.sender);
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}
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}
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