canic-core 0.100.102

Canic — a canister orchestration and management toolkit for the Internet Computer
Documentation 
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//! Module: infra::ic::mgmt::cycles
//!
//! Responsibility: perform raw management canister cycle operations.
//! Does not own: funding policy, threshold decisions, or workflow retries.
//! Boundary: extends `MgmtInfra` with cycle-related management calls.

use crate::{
    cdk::{
        candid::{Nat, Principal},
        types::Cycles,
    },
    infra::ic::{IcInfraError, call::Call},
};

use super::{MgmtInfra, MgmtInfraError, types::InfraCanisterIdRecord};

impl MgmtInfra {
    /// Return the exact current-Subnet cost of one zero-cycle deposit call.
    pub fn deposit_cycles_call_cost(canister_pid: Principal) -> Result<u128, IcInfraError> {
        Ok(deposit_cycles_call(canister_pid)?.cost())
    }

    /// Deposit cycles into a canister through the management canister.
    pub async fn deposit_cycles(canister_pid: Principal, cycles: u128) -> Result<(), IcInfraError> {
        deposit_cycles_call(canister_pid)?
            .with_cycles(cycles)
            .execute()
            .await?;

        Ok(())
    }

    /// Get a canister's cycle balance by querying canister status.
    pub async fn get_cycles(canister_pid: Principal) -> Result<Cycles, IcInfraError> {
        let status = Self::canister_status(canister_pid).await?;
        checked_canister_cycles(canister_pid, status.cycles).map_err(IcInfraError::from)
    }
}

fn deposit_cycles_call(
    canister_pid: Principal,
) -> Result<crate::infra::ic::call::CallBuilder<'static>, IcInfraError> {
    Call::unbounded_wait(Principal::management_canister(), "deposit_cycles").with_arg(
        InfraCanisterIdRecord {
            canister_id: canister_pid,
        },
    )
}

fn checked_canister_cycles(canister_pid: Principal, value: Nat) -> Result<Cycles, MgmtInfraError> {
    Cycles::try_from(value.clone()).map_err(|_| MgmtInfraError::CanisterCyclesOverflow {
        canister_pid,
        value,
    })
}

// -----------------------------------------------------------------------------
// Tests
// -----------------------------------------------------------------------------

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn checked_canister_cycles_preserves_overflow_identity_and_value() {
        let canister_pid = Principal::from_slice(&[7]);
        let value = Nat::parse(b"340282366920938463463374607431768211456")
            .expect("u128 max plus one is valid Nat");

        let err = checked_canister_cycles(canister_pid, value.clone())
            .expect_err("oversized status balance must fail closed");

        assert!(matches!(
            err,
            MgmtInfraError::CanisterCyclesOverflow {
                canister_pid: actual_canister_pid,
                value: actual_value,
            } if actual_canister_pid == canister_pid && actual_value == value
        ));
    }
}