-
Notifications
You must be signed in to change notification settings - Fork 27
/
mycustomkernel.rs
138 lines (121 loc) · 3.87 KB
/
mycustomkernel.rs
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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// Copyright 2021-2023 Protocol Labs
// SPDX-License-Identifier: Apache-2.0, MIT
use fvm::call_manager::CallManager;
use fvm::gas::Gas;
use fvm::kernel::prelude::*;
use fvm::kernel::Result;
use fvm::kernel::{
ActorOps, CryptoOps, DebugOps, EventOps, IpldBlockOps, MessageOps, NetworkOps, RandomnessOps,
SelfOps, SendOps, SyscallHandler, UpgradeOps,
};
use fvm::syscalls::Linker;
use fvm::DefaultKernel;
use fvm_shared::clock::ChainEpoch;
use fvm_shared::randomness::RANDOMNESS_LENGTH;
use fvm_shared::sys::out::network::NetworkContext;
use fvm_shared::sys::out::vm::MessageContext;
use fvm_shared::{address::Address, econ::TokenAmount, ActorID, MethodNum};
use ambassador::Delegate;
use cid::Cid;
// we define a single custom syscall which simply doubles the input
pub trait CustomKernel: Kernel {
fn my_custom_syscall(&self) -> Result<u64>;
}
// our custom kernel extends the filecoin kernel
#[derive(Delegate)]
#[delegate(IpldBlockOps, where = "C: CallManager")]
#[delegate(ActorOps, where = "C: CallManager")]
#[delegate(CryptoOps, where = "C: CallManager")]
#[delegate(DebugOps, where = "C: CallManager")]
#[delegate(EventOps, where = "C: CallManager")]
#[delegate(MessageOps, where = "C: CallManager")]
#[delegate(NetworkOps, where = "C: CallManager")]
#[delegate(RandomnessOps, where = "C: CallManager")]
#[delegate(SelfOps, where = "C: CallManager")]
#[delegate(SendOps<K>, generics = "K", where = "K: CustomKernel")]
#[delegate(UpgradeOps<K>, generics = "K", where = "K: CustomKernel")]
pub struct CustomKernelImpl<C>(pub DefaultKernel<C>);
impl<C> CustomKernel for CustomKernelImpl<C>
where
C: CallManager,
CustomKernelImpl<C>: Kernel,
{
fn my_custom_syscall(&self) -> Result<u64> {
// Here we have access to the Kernel structure and can call
// any of its methods, send messages, etc.
// We can also run an external program, link to any rust library
// access the network, etc.
// In this example, lets access the file system and return
// the number of paths in /
let paths = std::fs::read_dir("/").unwrap();
Ok(paths.count() as u64)
}
}
impl<C> Kernel for CustomKernelImpl<C>
where
C: CallManager,
{
type CallManager = C;
type Limiter = <DefaultKernel<C> as Kernel>::Limiter;
fn into_inner(self) -> (Self::CallManager, BlockRegistry)
where
Self: Sized,
{
self.0.into_inner()
}
fn new(
mgr: C,
blocks: BlockRegistry,
caller: ActorID,
actor_id: ActorID,
method: MethodNum,
value_received: TokenAmount,
read_only: bool,
) -> Self {
CustomKernelImpl(DefaultKernel::new(
mgr,
blocks,
caller,
actor_id,
method,
value_received,
read_only,
))
}
fn machine(&self) -> &<Self::CallManager as CallManager>::Machine {
self.0.machine()
}
fn limiter_mut(&mut self) -> &mut Self::Limiter {
self.0.limiter_mut()
}
fn gas_available(&self) -> Gas {
self.0.gas_available()
}
fn charge_gas(&self, name: &str, compute: Gas) -> Result<GasTimer> {
self.0.charge_gas(name, compute)
}
}
impl<K> SyscallHandler<K> for CustomKernelImpl<K::CallManager>
where
K: CustomKernel
+ ActorOps
+ SendOps
+ UpgradeOps
+ IpldBlockOps
+ CryptoOps
+ DebugOps
+ EventOps
+ MessageOps
+ NetworkOps
+ RandomnessOps
+ SelfOps,
{
fn link_syscalls(linker: &mut Linker<K>) -> anyhow::Result<()> {
DefaultKernel::<K::CallManager>::link_syscalls(linker)?;
linker.link_syscall("my_custom_kernel", "my_custom_syscall", my_custom_syscall)?;
Ok(())
}
}
pub fn my_custom_syscall(context: fvm::syscalls::Context<'_, impl CustomKernel>) -> Result<u64> {
context.kernel.my_custom_syscall()
}