Newer
Older
// Copyright 2017 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.
// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
//! Basic parachain that adds a number as part of its state.
#![cfg_attr(not(feature = "std"), no_std)]
#![cfg_attr(not(feature = "std"), feature(alloc, core_intrinsics, lang_items, panic_implementation, core_panic_info))]
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
139
140
141
142
143
#[cfg(not(feature = "std"))]
extern crate alloc;
extern crate polkadot_parachain as parachain;
extern crate wee_alloc;
extern crate tiny_keccak;
extern crate pwasm_libc;
use parachain::codec::{Slicable, Input};
#[cfg(not(feature = "std"))]
mod wasm;
#[cfg(not(feature = "std"))]
pub use wasm::*;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
// Define global allocator.
#[cfg(not(feature = "std"))]
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
// Head data for this parachain.
#[derive(Default, Clone)]
struct HeadData {
// Block number
number: u64,
// parent block keccak256
parent_hash: [u8; 32],
// hash of post-execution state.
post_state: [u8; 32],
}
impl Slicable for HeadData {
fn encode(&self) -> Vec<u8> {
let mut v = Vec::new();
self.number.using_encoded(|s| v.extend(s));
self.parent_hash.using_encoded(|s| v.extend(s));
self.post_state.using_encoded(|s| v.extend(s));
v
}
fn decode<I: Input>(input: &mut I) -> Option<Self> {
Some(HeadData {
number: Slicable::decode(input)?,
parent_hash: Slicable::decode(input)?,
post_state: Slicable::decode(input)?,
})
}
}
// Block data for this parachain.
#[derive(Default, Clone)]
struct BlockData {
// State to begin from.
state: u64,
// Amount to add (overflowing)
add: u64,
}
impl Slicable for BlockData {
fn encode(&self) -> Vec<u8> {
let mut v = Vec::new();
self.state.using_encoded(|s| v.extend(s));
self.add.using_encoded(|s| v.extend(s));
v
}
fn decode<I: Input>(input: &mut I) -> Option<Self> {
Some(BlockData {
state: Slicable::decode(input)?,
add: Slicable::decode(input)?,
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use parachain::ValidationParams;
const TEST_CODE: &[u8] = include_bytes!("../wasm/test.wasm");
fn hash_state(state: u64) -> [u8; 32] {
::tiny_keccak::keccak256(state.encode().as_slice())
}
fn hash_head(head: &HeadData) -> [u8; 32] {
::tiny_keccak::keccak256(head.encode().as_slice())
}
#[test]
fn execute_good_on_parent() {
let parent_head = HeadData {
number: 0,
parent_hash: [0; 32],
post_state: hash_state(0),
};
let block_data = BlockData {
state: 0,
add: 512,
};
let ret = parachain::wasm::validate_candidate(TEST_CODE, ValidationParams {
parent_head: parent_head.encode(),
block_data: block_data.encode(),
}).unwrap();
let new_head = HeadData::decode(&mut &ret.head_data[..]).unwrap();
assert_eq!(new_head.number, 1);
assert_eq!(new_head.parent_hash, hash_head(&parent_head));
assert_eq!(new_head.post_state, hash_state(512));
}
}