Attribute Macro heartbeat

#[heartbeat]

Register the canister_heartbeat entry point of a canister.

This attribute macro will export the function canister_heartbeat in the canister module.

The function under this attribute must have no return value.

Each canister can only have one canister_heartbeat entry point.

Example

#[heartbeat]
fn heartbeat_function() {
    // ...
}

You can specify a guard function to be executed before the heartbeat function. When the guard function returns an error, the heartbeat function will not proceed.

fn guard_function() -> Result<(), String> {
    // ...
}
#[heartbeat(guard = "guard_function")]
fn heartbeat_function() {
    // ...
}