stack_epic_core 3.6.0

Chain implementation for epic, a simple, private and scalable cryptocurrency implementation based on the MimbleWimble chain format.
Documentation 
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

// extern crate randomx;

use std::marker::PhantomData;

use crate::pow::common::EdgeType;
use crate::pow::error::{Error};
use crate::pow::{PoWContext, Proof};
// use crate::util::RwLock;

// use randomx::{slow_hash, RxState};

lazy_static! {
	// pub static ref RX_STATE: RwLock<RxState> = RwLock::new(RxState::new());
}

pub const SEEDHASH_EPOCH_BLOCKS: u64 = 1000;
pub const SEEDHASH_EPOCH_LAG: u64 = 60;

pub fn rx_epoch_start(epoch_height: u64) -> u64 {
	if epoch_height == 0 {
		0
	} else {
		epoch_height + SEEDHASH_EPOCH_LAG
	}
}

pub fn rx_epoch_end(epoch_height: u64) -> u64 {
	if epoch_height == 0 {
		SEEDHASH_EPOCH_BLOCKS + SEEDHASH_EPOCH_LAG
	} else {
		epoch_height + SEEDHASH_EPOCH_LAG + SEEDHASH_EPOCH_BLOCKS
	}
}

pub fn rx_next_seed_height(height: u64) -> Option<u64> {
	let next_height = height - (height % SEEDHASH_EPOCH_BLOCKS);

	if height <= SEEDHASH_EPOCH_BLOCKS {
		return None;
	}

	if (height - 1) % SEEDHASH_EPOCH_BLOCKS <= SEEDHASH_EPOCH_LAG {
		Some(next_height)
	} else {
		None
	}
}

pub fn rx_current_seed_height(height: u64) -> u64 {
	if height <= SEEDHASH_EPOCH_LAG + SEEDHASH_EPOCH_BLOCKS {
		return 0;
	}

	if height % SEEDHASH_EPOCH_BLOCKS <= SEEDHASH_EPOCH_LAG {
		height - (height % SEEDHASH_EPOCH_BLOCKS) - SEEDHASH_EPOCH_BLOCKS
	} else {
		height - (height % SEEDHASH_EPOCH_BLOCKS)
	}
}

pub struct RXContext<T>
where
	T: EdgeType,
{
	pub seed: [u8; 32],
	pub header: Vec<u8>,
	pub nonce: u64,
	phantom: PhantomData<T>,
}

pub fn new_randomx_ctx<T>(seed: [u8; 32]) -> Result<Box<dyn PoWContext<T>>, Error>
where
	T: EdgeType + 'static,
{
	Ok(Box::new(RXContext {
		phantom: PhantomData,
		header: vec![],
		nonce: 0,
		seed,
	}))
}

impl<T> PoWContext<T> for RXContext<T>
where
	T: EdgeType,
{
	fn set_header_nonce(
		&mut self,
		header: Vec<u8>,
		nonce: Option<u64>,
		_height: Option<u64>,
		_solve: bool,
	) -> Result<(), Error> {
		self.header = header;
		self.nonce = nonce.unwrap_or(self.nonce);
		Ok(())
	}

	fn pow_solve(&mut self) -> Result<Vec<Proof>, Error> {
		// let hash = {
		// 	let mut state = RX_STATE.write();
		// 	slow_hash(&mut state, &self.header, &self.seed)
		// };
		//
		// Ok(vec![Proof::RandomXProof { hash: hash.into() }])
		unimplemented!()
	}

	fn verify(&mut self, _proof: &Proof) -> Result<(), Error> {
		// let hash = {
		// 	let mut state = RX_STATE.write();
		// 	slow_hash(&mut state, &self.header, &self.seed)
		// };
		//
		// let hash_u8: [u8; 32] = hash.into();
		//
		// if let Proof::RandomXProof { hash: ref proof } = proof {
		// 	if &hash_u8 == proof {
		// 		return Ok(());
		// 	}
		// }
		//
		// Err(ErrorKind::Verification("Hash randomx invalid!".to_string()))?
		unimplemented!()
	}
}