forest/shim/
externs.rs

1// Copyright 2019-2025 ChainSafe Systems
2// SPDX-License-Identifier: Apache-2.0, MIT
3
4use fvm_shared2::clock::ChainEpoch as ChainEpoch_v2;
5use fvm_shared3::clock::ChainEpoch as ChainEpoch_v3;
6use fvm_shared4::clock::ChainEpoch as ChainEpoch_v4;
7use fvm2::externs::Rand as Rand_v2;
8use fvm3::externs::Rand as Rand_v3;
9use fvm4::externs::Rand as Rand_v4;
10
11#[derive(Clone, Debug)]
12pub struct RandWrapper<T> {
13    pub chain_rand: T,
14}
15
16pub trait Rand {
17    fn get_chain_randomness(&self, round: ChainEpoch_v2) -> anyhow::Result<[u8; 32]>;
18    fn get_beacon_randomness(&self, round: ChainEpoch_v2) -> anyhow::Result<[u8; 32]>;
19}
20
21impl Rand for Box<dyn Rand> {
22    fn get_chain_randomness(&self, round: ChainEpoch_v2) -> anyhow::Result<[u8; 32]> {
23        self.as_ref().get_chain_randomness(round)
24    }
25    fn get_beacon_randomness(&self, round: ChainEpoch_v2) -> anyhow::Result<[u8; 32]> {
26        self.as_ref().get_beacon_randomness(round)
27    }
28}
29
30impl<T: Rand> Rand_v2 for RandWrapper<T> {
31    fn get_chain_randomness(&self, round: ChainEpoch_v2) -> anyhow::Result<[u8; 32]> {
32        self.chain_rand.get_chain_randomness(round)
33    }
34
35    fn get_beacon_randomness(&self, round: ChainEpoch_v2) -> anyhow::Result<[u8; 32]> {
36        self.chain_rand.get_beacon_randomness(round)
37    }
38}
39
40impl<T: Rand> Rand_v3 for RandWrapper<T> {
41    fn get_chain_randomness(&self, round: ChainEpoch_v3) -> anyhow::Result<[u8; 32]> {
42        self.chain_rand.get_chain_randomness(round)
43    }
44
45    fn get_beacon_randomness(&self, round: ChainEpoch_v3) -> anyhow::Result<[u8; 32]> {
46        self.chain_rand.get_beacon_randomness(round)
47    }
48}
49
50impl<T: Rand> Rand_v4 for RandWrapper<T> {
51    fn get_chain_randomness(&self, round: ChainEpoch_v4) -> anyhow::Result<[u8; 32]> {
52        self.chain_rand.get_chain_randomness(round)
53    }
54
55    fn get_beacon_randomness(&self, round: ChainEpoch_v4) -> anyhow::Result<[u8; 32]> {
56        self.chain_rand.get_beacon_randomness(round)
57    }
58}
59
60impl<T> From<T> for RandWrapper<T> {
61    fn from(chain_rand: T) -> Self {
62        RandWrapper { chain_rand }
63    }
64}
forest/shim/externs.rs

forest/shim/
externs.rs
