1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

// Copyright 2020 ChainSafe Systems
// SPDX-License-Identifier: Apache-2.0, MIT

use crate::{check_empty_params, SYSTEM_ACTOR_ADDR};

use encoding::Cbor;
use ipld_blockstore::BlockStore;
use num_derive::FromPrimitive;
use num_traits::FromPrimitive;
use runtime::{ActorCode, Runtime};
use serde::{Deserialize, Serialize};
use vm::{actor_error, ActorError, ExitCode, MethodNum, Serialized, METHOD_CONSTRUCTOR};

// * Updated to specs-actors commit: 17d3c602059e5c48407fb3c34343da87e6ea6586 (v0.9.12)

/// System actor methods.
#[derive(FromPrimitive)]
#[repr(u64)]
pub enum Method {
    Constructor = METHOD_CONSTRUCTOR,
}

/// System actor state.
#[derive(Default, Deserialize, Serialize)]
#[serde(transparent)]
pub struct State([(); 0]);
impl Cbor for State {}

/// System actor.
pub struct Actor;
impl Actor {
    /// System actor constructor.
    pub fn constructor<BS, RT>(rt: &mut RT) -> Result<(), ActorError>
    where
        BS: BlockStore,
        RT: Runtime<BS>,
    {
        rt.validate_immediate_caller_is(std::iter::once(&*SYSTEM_ACTOR_ADDR))?;

        rt.create(&State::default())?;
        Ok(())
    }
}

impl ActorCode for Actor {
    fn invoke_method<BS, RT>(
        rt: &mut RT,
        method: MethodNum,
        params: &Serialized,
    ) -> Result<Serialized, ActorError>
    where
        BS: BlockStore,
        RT: Runtime<BS>,
    {
        match FromPrimitive::from_u64(method) {
            Some(Method::Constructor) => {
                check_empty_params(params)?;
                Self::constructor(rt)?;
                Ok(Serialized::default())
            }
            None => Err(actor_error!(SysErrInvalidMethod; "Invalid method")),
        }
    }
}