Sway Libs

use sway_libs::pausable::{_is_paused, _pause, _unpause, Pausable};
 
impl Pausable for Contract {
    #[storage(write)]
    fn pause() {
        _pause();
    }
 
    #[storage(write)]
    fn unpause() {
        _unpause();
    }
 
    #[storage(read)]
    fn is_paused() -> bool {
        _is_paused()
    }
}

Icon Link应用暂停限制

在开发合约时，您可能希望将函数锁定到特定状态。为此，您可以调用require_paused()或require_not_paused()函数之一。下面的示例展示了这些函数的使用。

use sway_libs::pausable::require_paused;
 
#[storage(read)]
fn require_paused_state() {
    require_paused();
    // This comment will only ever be reached if the contract is in the paused state
}

use sway_libs::pausable::require_not_paused;
 
#[storage(read)]
fn require_not_paused_state() {
    require_not_paused();
    // This comment will only ever be reached if the contract is in the unpaused state
}

Icon Link使用拥有权库与暂停库

强烈建议将拥有权库与暂停库结合使用，并将限制应用于pause()和unpause()函数。这将确保只有单个用户在紧急情况下才能暂停和取消暂停合约。如果不应用此限制，将允许任何用户阻碍合约的功能。

以下示例实现了Pausable abi，并对其暂停/取消暂停函数应用了限制。在此示例中，合约的所有者必须在一个名为MyConstructor的构造函数中设置。

use sway_libs::{
    ownership::{
        initialize_ownership,
        only_owner,
    },
    pausable::{
        _is_paused,
        _pause,
        _unpause,
        Pausable,
    },
};
 
abi MyConstructor {
    #[storage(read, write)]
    fn my_constructor(new_owner: Identity);
}
 
impl MyConstructor for Contract {
    #[storage(read, write)]
    fn my_constructor(new_owner: Identity) {
        initialize_ownership(new_owner);
    }
}
 
impl Pausable for Contract {
    #[storage(write)]
    fn pause() {
        // Add the `only_owner()` check to ensure only the owner may unpause this contract.
        only_owner();
        _pause();
    }
 
    #[storage(write)]
    fn unpause() {
        // Add the `only_owner()` check to ensure only the owner may unpause this contract.
        only_owner();
        _unpause();
    }
 
    #[storage(read)]
    fn is_paused() -> bool {
        _is_paused()
    }
}

Icon Link暂停库

Icon Link导入暂停库

Icon Link基本功能

Icon Link实现Pausable abi

Icon Link应用暂停限制

Icon Link使用拥有权库与暂停库

Icon Link实现`Pausable` abi