fvm 4.8.1 

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// Copyright 2021-2023 Protocol Labs
// SPDX-License-Identifier: Apache-2.0, MIT
use fvm_shared::randomness::RANDOMNESS_LENGTH;

use super::Context;
use crate::kernel::{RandomnessOps, Result};

/// Gets 32 bytes of randomness from the ticket chain.
/// The supplied output buffer must have at least 32 bytes of capacity.
/// If this syscall succeeds, exactly 32 bytes will be written starting at the
/// supplied offset.
pub fn get_chain_randomness(
    context: Context<'_, impl RandomnessOps>,
    round: i64, // ChainEpoch
) -> Result<[u8; RANDOMNESS_LENGTH]> {
    context.kernel.get_randomness_from_tickets(round)
}

/// Gets 32 bytes of randomness from the beacon system (currently Drand).
/// The supplied output buffer must have at least 32 bytes of capacity.
/// If this syscall succeeds, exactly 32 bytes will be written starting at the
/// supplied offset.
pub fn get_beacon_randomness(
    context: Context<'_, impl RandomnessOps>,
    round: i64, // ChainEpoch
) -> Result<[u8; RANDOMNESS_LENGTH]> {
    context.kernel.get_randomness_from_beacon(round)
}