Function check_balance_before_transfer

libs/orbit-essentials/src/utils/cycles.rs:5–23

(transfer_amount: u128)

use ic_cdk::id;

pub async fn check_balance_before_transfer(transfer_amount: u128) -> Result<(), String> {
    let self_id = id();
    let status = canister_status(CanisterIdRecord {
        canister_id: self_id,
    })
    .await
    .map_err(|(_, err)| err)?
    .0;
    // enough cycles to keep the canister unfrozen for its freezing threshold duration
    let min_balance =
        status.idle_cycles_burned_per_day * status.settings.freezing_threshold * 2_u64 / 86_400u64;
    if canister_balance() < min_balance + transfer_amount {
        let err = format!(
            "Canister {self_id} has insufficient cycles balance to transfer {transfer_amount} cycles."
        );
        return Err(err);
    }
    Ok(())
}