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#![allow(clippy::float_cmp)]
use crate::SmtMapping;
use serde::{Deserialize, Serialize};
pub const STAKE_EPOCH: u64 = 200000;
#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
pub struct StakeDoc {
pub pubkey: tmelcrypt::Ed25519PK,
pub e_start: u64,
pub e_post_end: u64,
pub syms_staked: u128,
}
pub type StakeMapping = SmtMapping<tmelcrypt::HashVal, StakeDoc>;
impl SmtMapping<tmelcrypt::HashVal, StakeDoc> {
pub fn vote_power(&self, epoch: u64, pubkey: tmelcrypt::Ed25519PK) -> f64 {
let mut total_votes = 1e-50;
let mut target_votes = 0.0;
for sdoc in self.val_iter() {
if epoch >= sdoc.e_start && epoch < sdoc.e_post_end {
total_votes += sdoc.syms_staked as f64;
if sdoc.pubkey == pubkey {
target_votes += sdoc.syms_staked as f64;
}
}
}
target_votes / total_votes
}
pub fn remove_stale(&mut self, epoch: u64) {
let stale_key_hashes = self
.mapping
.iter()
.filter_map(|(kh, v)| {
let v: StakeDoc = stdcode::deserialize(&v).unwrap();
if epoch > v.e_post_end {
Some(kh)
} else {
None
}
})
.collect::<Vec<_>>();
for stale_key in stale_key_hashes {
self.mapping.insert(stale_key, Default::default());
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{melvm, CoinData, CoinDataHeight, CoinID};
use crate::{Denom, State};
use rstest::rstest;
use std::collections::HashMap;
use tmelcrypt::Ed25519SK;
fn create_state(stakers: &HashMap<Ed25519SK, u128>, epoch_start: u64) -> State {
let db = novasmt::Forest::new(novasmt::InMemoryBackend::default());
let mut state = State::new_empty_testnet(db);
let start_micromels = 10000;
let start_conshash = melvm::Covenant::always_true().hash();
state.coins.insert(
CoinID {
txhash: tmelcrypt::HashVal([0; 32]),
index: 0,
},
CoinDataHeight {
coin_data: CoinData {
covhash: start_conshash,
value: start_micromels,
denom: Denom::Mel,
additional_data: vec![],
},
height: 0,
},
);
for (i, (sk, syms_staked)) in stakers.iter().enumerate() {
state.stakes.insert(
tmelcrypt::hash_single(&(i as u128).to_be_bytes()),
StakeDoc {
pubkey: sk.to_public(),
e_start: epoch_start,
e_post_end: 1000000000,
syms_staked: *syms_staked,
},
);
}
state
}
#[rstest(
staked_syms => [vec![100u128], vec![100u128, 10], vec![1u128, 2u128, 3u128]]
)]
fn test_non_staker_has_no_vote_power(staked_syms: Vec<u128>) {
let stakers = staked_syms
.into_iter()
.map(|e| (tmelcrypt::ed25519_keygen().1, e))
.collect();
let genesis = create_state(&stakers, 0);
let (pk, _sk) = tmelcrypt::ed25519_keygen();
let vote_power = genesis.stakes.vote_power(0, pk);
assert_eq!(vote_power, 0.0)
}
#[rstest(
staked_syms => [vec![100_u128, 200_u128, 300 as u128], vec![100 as u128, 10], vec![1 as u128, 2 as u128, 30 as u128]]
)]
fn test_staker_has_correct_vote_power_in_epoch(staked_syms: Vec<u128>) {
let total_staked_syms: u128 = staked_syms.iter().sum();
let stakers = staked_syms
.into_iter()
.map(|e| (tmelcrypt::ed25519_keygen().1, e))
.collect();
let state = create_state(&stakers, 0);
for (sk, vote) in stakers.iter() {
let vote_power = state.stakes.vote_power(0, sk.to_public());
let expected_vote_power = (*vote as f64) / (total_staked_syms as f64);
assert_eq!(expected_vote_power - vote_power, 0.0 as f64);
}
}
#[rstest(
epoch_start => [1, 2, 100]
)]
fn test_staker_has_no_vote_power_in_previous_epoch(epoch_start: u64) {
let staked_syms = vec![100 as u128; 3];
let stakers = staked_syms
.into_iter()
.map(|e| (tmelcrypt::ed25519_keygen().1, e))
.collect();
let state = create_state(&stakers, epoch_start);
for (sk, _vote) in stakers.iter() {
for epoch in 0..epoch_start {
let vote_power = state.stakes.vote_power(epoch, sk.to_public());
let expected_vote_power = 0.0 as f64;
assert_eq!(vote_power, expected_vote_power);
}
let vote_power = state.stakes.vote_power(epoch_start, sk.to_public());
let expected_vote_power = 0.0 as f64;
assert_ne!(vote_power, expected_vote_power);
}
}
#[rstest(
staked_sym => [1, 2, 123]
)]
fn test_vote_power_single_staker_is_total(staked_sym: u128) {
let (pk, sk) = tmelcrypt::ed25519_keygen();
let mut stakers = HashMap::new();
stakers.insert(sk, staked_sym);
let state = create_state(&stakers, 0);
let expected_voting_power = 1.0;
assert_eq!(state.stakes.vote_power(0, pk), expected_voting_power);
}
#[rstest(
epoch => [0 as u64, 1 as u64, 100 as u64]
)]
fn test_vote_power_is_zero_no_stakers(epoch: u64) {
let stakers = HashMap::new();
let state = create_state(&stakers, epoch);
let voting_power = state
.stakes
.vote_power(epoch, tmelcrypt::ed25519_keygen().0);
assert_eq!(voting_power, 0.0);
}
#[rstest(
staked_syms => [vec![0], vec![0; 3], vec![0; 100]]
)]
fn test_vote_power_is_zero_when_stakers_are_staking_zero(staked_syms: Vec<u128>) {
let stakers = staked_syms
.into_iter()
.map(|e| (tmelcrypt::ed25519_keygen().1, e))
.collect();
let state = create_state(&stakers, 0);
for (sk, _vote) in stakers.iter() {
let vote_power = state.stakes.vote_power(0, sk.to_public());
assert_eq!(vote_power, 0.0 as f64);
}
}
#[test]
fn test_remove_stale_all_stale() {
let staked_syms: Vec<u128> = vec![0 as u128; 100];
let stakers = staked_syms
.into_iter()
.map(|e| (tmelcrypt::ed25519_keygen().1, e))
.collect();
let mut state = create_state(&stakers, 0);
state.stakes.remove_stale(100000000000);
for (_key, value) in state.stakes.mapping.iter() {
assert_eq!(value.as_ref(), b"");
}
}
#[test]
fn test_remove_stale_no_stale() {
let staked_syms: Vec<u128> = vec![0 as u128; 100];
let stakers = staked_syms
.into_iter()
.map(|e| (tmelcrypt::ed25519_keygen().1, e))
.collect();
let mut state = create_state(&stakers, 0);
state.stakes.remove_stale(100);
for (_key, value) in state.stakes.mapping.iter() {
assert_ne!(value.as_ref(), b"");
}
}
}