572 lines
22 KiB
Rust
572 lines
22 KiB
Rust
use crate::error::*;
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use crate::state::lockup::{Lockup, LockupKind};
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use crate::state::voting_mint_config::VotingMintConfig;
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use anchor_lang::prelude::*;
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use std::cmp::min;
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use std::convert::TryFrom;
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/// Bookkeeping for a single deposit for a given mint and lockup schedule.
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#[zero_copy]
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#[derive(Default)]
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pub struct DepositEntry {
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// Locked state.
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pub lockup: Lockup,
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/// Amount in deposited, in native currency. Withdraws of vested tokens
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/// directly reduce this amount.
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///
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/// This directly tracks the total amount added by the user. They may
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/// never withdraw more than this amount.
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pub amount_deposited_native: u64,
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/// Amount in locked when the lockup began, in native currency.
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///
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/// Note that this is not adjusted for withdraws. It is possible for this
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/// value to be bigger than amount_deposited_native after some vesting
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/// and withdrawals.
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///
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/// This value is needed to compute the amount that vests each peroid,
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/// which should not change due to withdraws.
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pub amount_initially_locked_native: u64,
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// True if the deposit entry is being used.
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pub is_used: bool,
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/// If the clawback authority is allowed to extract locked tokens.
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pub allow_clawback: bool,
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// Points to the VotingMintConfig this deposit uses.
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pub voting_mint_config_idx: u8,
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pub reserved: [u8; 29],
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}
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const_assert!(std::mem::size_of::<DepositEntry>() == 32 + 2 * 8 + 3 + 29);
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const_assert!(std::mem::size_of::<DepositEntry>() % 8 == 0);
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impl DepositEntry {
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/// # Voting Power Caclulation
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///
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/// Returns the voting power for the deposit, giving locked tokens boosted
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/// voting power that scales linearly with the lockup time.
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///
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/// For each cliff-locked token, the vote weight is:
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///
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/// ```
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/// voting_power = baseline_vote_weight
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/// + lockup_duration_factor * max_extra_lockup_vote_weight
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/// ```
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///
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/// with
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/// - lockup_duration_factor = min(lockup_time_remaining / lockup_saturation_secs, 1)
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/// - the VotingMintConfig providing the values for
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/// baseline_vote_weight, max_extra_lockup_vote_weight, lockup_saturation_secs
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///
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/// Linear vesting schedules can be thought of as a sequence of cliff-
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/// locked tokens and have the matching voting weight.
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///
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/// ## Cliff Lockup
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///
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/// The cliff lockup allows one to lockup their tokens for a set period
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/// of time, unlocking all at once on a given date.
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///
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/// The calculation for this is straightforward and is detailed above.
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///
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/// ### Decay
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///
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/// As time passes, the voting power decays until it's back to just
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/// fixed_factor when the cliff has passed. This is important because at
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/// each point in time the lockup should be equivalent to a new lockup
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/// made for the remaining time period.
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///
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/// ## Linear Vesting Lockup
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///
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/// Daily/monthly linear vesting can be calculated with series sum, see
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/// voting_power_linear_vesting() below.
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///
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pub fn voting_power(&self, voting_mint_config: &VotingMintConfig, curr_ts: i64) -> Result<u64> {
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let baseline_vote_weight =
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voting_mint_config.baseline_vote_weight(self.amount_deposited_native)?;
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let max_locked_vote_weight =
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voting_mint_config.max_extra_lockup_vote_weight(self.amount_initially_locked_native)?;
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let locked_vote_weight = self.voting_power_locked(
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curr_ts,
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max_locked_vote_weight,
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voting_mint_config.lockup_saturation_secs,
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)?;
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require_gte!(
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max_locked_vote_weight,
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locked_vote_weight,
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VsrError::InternalErrorBadLockupVoteWeight
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);
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baseline_vote_weight
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.checked_add(locked_vote_weight)
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.ok_or_else(|| error!(VsrError::VoterWeightOverflow))
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}
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/// Vote power contribution from locked funds only.
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pub fn voting_power_locked(
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&self,
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curr_ts: i64,
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max_locked_vote_weight: u64,
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lockup_saturation_secs: u64,
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) -> Result<u64> {
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if self.lockup.expired(curr_ts) || max_locked_vote_weight == 0 {
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return Ok(0);
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}
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match self.lockup.kind {
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LockupKind::None => Ok(0),
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LockupKind::Daily => self.voting_power_linear_vesting(
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curr_ts,
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max_locked_vote_weight,
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lockup_saturation_secs,
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),
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LockupKind::Monthly => self.voting_power_linear_vesting(
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curr_ts,
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max_locked_vote_weight,
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lockup_saturation_secs,
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),
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LockupKind::Cliff => {
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self.voting_power_cliff(curr_ts, max_locked_vote_weight, lockup_saturation_secs)
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}
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LockupKind::Constant => {
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self.voting_power_cliff(curr_ts, max_locked_vote_weight, lockup_saturation_secs)
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}
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}
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}
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/// Vote power contribution from locked funds only at `at_ts`, assuming the user does everything
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/// they can to unlock as quickly as possible at `curr_ts`.
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///
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/// Currently that means that Constant lockups get turned into Cliff lockups.
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pub fn voting_power_locked_guaranteed(
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&self,
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curr_ts: i64,
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at_ts: i64,
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max_locked_vote_weight: u64,
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lockup_saturation_secs: u64,
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) -> Result<u64> {
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let mut altered = *self;
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// Trigger the unlock phase for constant lockups
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if self.lockup.kind == LockupKind::Constant {
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altered.lockup.kind = LockupKind::Cliff;
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altered.lockup.start_ts = curr_ts;
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altered.lockup.end_ts = curr_ts
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.checked_add(i64::try_from(self.lockup.seconds_left(curr_ts)).unwrap())
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.unwrap();
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}
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// Other lockup types don't need changes, because the user
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// cannot reduce their lockup strength.
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altered.voting_power_locked(at_ts, max_locked_vote_weight, lockup_saturation_secs)
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}
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/// Vote power contribution from funds with linear vesting.
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fn voting_power_cliff(
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&self,
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curr_ts: i64,
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max_locked_vote_weight: u64,
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lockup_saturation_secs: u64,
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) -> Result<u64> {
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let remaining = min(self.lockup.seconds_left(curr_ts), lockup_saturation_secs);
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Ok(u64::try_from(
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(max_locked_vote_weight as u128)
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.checked_mul(remaining as u128)
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.unwrap()
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.checked_div(lockup_saturation_secs as u128)
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.unwrap(),
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)
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.unwrap())
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}
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/// Vote power contribution from cliff-locked funds.
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fn voting_power_linear_vesting(
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&self,
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curr_ts: i64,
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max_locked_vote_weight: u64,
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lockup_saturation_secs: u64,
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) -> Result<u64> {
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let periods_left = self.lockup.periods_left(curr_ts)?;
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let periods_total = self.lockup.periods_total()?;
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let period_secs = self.lockup.kind.period_secs() as u64;
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if periods_left == 0 {
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return Ok(0);
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}
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// This computes the voting power by considering the linear vesting as a
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// sequence of vesting cliffs.
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//
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// For example, if there were 5 vesting periods, with 3 of them left
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// (i.e. two have already vested and their tokens are no longer locked)
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// we'd have (max_locked_vote_weight / 5) weight in each of them, and the
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// voting power would be:
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// (max_locked_vote_weight/5) * secs_left_for_cliff_1 / lockup_saturation_secs
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// + (max_locked_vote_weight/5) * secs_left_for_cliff_2 / lockup_saturation_secs
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// + (max_locked_vote_weight/5) * secs_left_for_cliff_3 / lockup_saturation_secs
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//
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// Or more simply:
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// max_locked_vote_weight * (\sum_p secs_left_for_cliff_p) / (5 * lockup_saturation_secs)
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// = max_locked_vote_weight * lockup_secs / denominator
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//
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// The value secs_left_for_cliff_p splits up as
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// secs_left_for_cliff_p = min(
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// secs_to_closest_cliff + (p-1) * period_secs,
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// lockup_saturation_secs)
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//
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// If secs_to_closest_cliff < lockup_saturation_secs, we can split the sum
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// \sum_p secs_left_for_cliff_p
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// into the part before saturation and the part after:
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// Let q be the largest integer 1 <= q <= periods_left where
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// secs_to_closest_cliff + (q-1) * period_secs < lockup_saturation_secs
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// => q = (lockup_saturation_secs - secs_to_closest_cliff + period_secs) / period_secs
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// and r be the integer where q + r = periods_left, then:
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// lockup_secs := \sum_p secs_left_for_cliff_p
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// = \sum_{p<=q} secs_left_for_cliff_p
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// + r * lockup_saturation_secs
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// = q * secs_to_closest_cliff
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// + period_secs * \sum_0^q (p-1)
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// + r * lockup_saturation_secs
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//
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// Where the sum can be expanded to:
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//
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// sum_full_periods := \sum_0^q (p-1)
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// = q * (q - 1) / 2
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//
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let secs_to_closest_cliff = self
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.lockup
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.seconds_left(curr_ts)
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.checked_sub(
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period_secs
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.checked_mul(periods_left.saturating_sub(1))
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.unwrap(),
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)
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.unwrap();
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if secs_to_closest_cliff >= lockup_saturation_secs {
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return Ok(max_locked_vote_weight);
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}
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// In the example above, periods_total was 5.
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let denominator = periods_total.checked_mul(lockup_saturation_secs).unwrap();
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let lockup_saturation_periods = (lockup_saturation_secs
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.saturating_sub(secs_to_closest_cliff)
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.checked_add(period_secs)
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.unwrap())
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.checked_div(period_secs)
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.unwrap();
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let q = min(lockup_saturation_periods, periods_left);
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let r = periods_left.saturating_sub(q);
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// Sum of the full periods left for all remaining vesting cliffs.
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//
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// Examples:
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// - if there are 3 periods left, meaning three vesting cliffs in the future:
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// one has only a fractional period left and contributes 0
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// the next has one full period left
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// and the next has two full periods left
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// so sums to 3 = 3 * 2 / 2
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// - if there's only one period left, the sum is 0
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let sum_full_periods = q.checked_mul(q.saturating_sub(1)).unwrap() / 2;
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// Total number of seconds left over all periods_left remaining vesting cliffs
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let lockup_secs_fractional = q.checked_mul(secs_to_closest_cliff).unwrap();
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let lockup_secs_full = sum_full_periods.checked_mul(period_secs).unwrap();
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let lockup_secs_saturated = r.checked_mul(lockup_saturation_secs).unwrap();
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let lockup_secs = lockup_secs_fractional as u128
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+ lockup_secs_full as u128
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+ lockup_secs_saturated as u128;
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Ok(u64::try_from(
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(max_locked_vote_weight as u128)
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.checked_mul(lockup_secs)
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.unwrap()
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.checked_div(denominator as u128)
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.unwrap(),
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)
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.unwrap())
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}
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/// Returns the amount of unlocked tokens for this deposit--in native units
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/// of the original token amount (not scaled by the exchange rate).
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pub fn vested(&self, curr_ts: i64) -> Result<u64> {
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if self.lockup.expired(curr_ts) {
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return Ok(self.amount_initially_locked_native);
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}
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match self.lockup.kind {
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LockupKind::None => Ok(self.amount_initially_locked_native),
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LockupKind::Daily => self.vested_linearly(curr_ts),
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LockupKind::Monthly => self.vested_linearly(curr_ts),
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LockupKind::Cliff => Ok(0),
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LockupKind::Constant => Ok(0),
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}
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}
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fn vested_linearly(&self, curr_ts: i64) -> Result<u64> {
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let period_current = self.lockup.period_current(curr_ts)?;
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let periods_total = self.lockup.periods_total()?;
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if period_current == 0 {
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return Ok(0);
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}
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if period_current >= periods_total {
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return Ok(self.amount_initially_locked_native);
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}
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let vested = self
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.amount_initially_locked_native
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.checked_mul(period_current)
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.unwrap()
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.checked_div(periods_total)
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.unwrap();
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Ok(vested)
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}
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/// Returns native tokens still locked.
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#[inline(always)]
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pub fn amount_locked(&self, curr_ts: i64) -> u64 {
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self.amount_initially_locked_native
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.checked_sub(self.vested(curr_ts).unwrap())
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.unwrap()
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}
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/// Returns native tokens that are unlocked given current vesting
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/// and previous withdraws.
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#[inline(always)]
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pub fn amount_unlocked(&self, curr_ts: i64) -> u64 {
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self.amount_deposited_native
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.checked_sub(self.amount_locked(curr_ts))
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.unwrap()
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}
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/// Adjusts the deposit and remaining lockup periods such that
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/// no parts of amount_initially_locked_native have vested.
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///
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/// That makes it easier to deal with changes to the locked
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/// amount because amount_initially_locked_native represents
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/// exactly the amount that is locked.
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///
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/// Example:
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/// If 30 tokens are locked up over 3 months, vesting each month,
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/// then after month 2:
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/// amount_initially_locked_native = 30
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/// amount_deposited_native = 30
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/// vested() = 20
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/// period_current() = 2
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/// periods_total() = 3
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/// And after this function was called:
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/// amount_initially_locked_native = 10
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/// amount_deposited_native = 30
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/// vested() = 0
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/// period_current() = 0
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/// periods_total() = 1
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pub fn resolve_vesting(&mut self, curr_ts: i64) -> Result<()> {
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let vested_amount = self.vested(curr_ts)?;
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require_gte!(
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self.amount_initially_locked_native,
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vested_amount,
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VsrError::InternalProgramError
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);
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self.amount_initially_locked_native = self
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.amount_initially_locked_native
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.checked_sub(vested_amount)
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.unwrap();
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self.lockup.remove_past_periods(curr_ts)?;
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require_eq!(self.vested(curr_ts)?, 0, VsrError::InternalProgramError);
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::LockupKind::{Constant, Daily};
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#[test]
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pub fn resolve_vesting() -> Result<()> {
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let mut deposit = DepositEntry {
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amount_deposited_native: 35,
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amount_initially_locked_native: 30,
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lockup: Lockup::new_from_periods(LockupKind::Monthly, 1000, 1000, 3).unwrap(),
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is_used: true,
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allow_clawback: false,
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voting_mint_config_idx: 0,
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reserved: [0; 29],
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};
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let initial_deposit = deposit.clone();
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let month = deposit.lockup.kind.period_secs() as i64;
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// function to avoid unaligned references when used with assert!()
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let amount_initially_locked =
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|deposit: &DepositEntry| deposit.amount_initially_locked_native;
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let mut time = 1001;
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assert_eq!(deposit.vested(time).unwrap(), 0);
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assert_eq!(deposit.amount_unlocked(time), 5);
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deposit.resolve_vesting(time).unwrap(); // no effect
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assert_eq!(deposit.vested(time).unwrap(), 0);
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assert_eq!(deposit.amount_unlocked(time), 5);
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assert_eq!(
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deposit.lockup.seconds_left(time),
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initial_deposit.lockup.seconds_left(time)
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);
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assert_eq!(deposit.lockup.period_current(time).unwrap(), 0);
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assert_eq!(deposit.lockup.periods_total().unwrap(), 3);
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assert_eq!(amount_initially_locked(&deposit), 30);
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time = 1001 + month;
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assert_eq!(deposit.vested(time).unwrap(), 10);
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assert_eq!(deposit.lockup.period_current(time).unwrap(), 1);
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assert_eq!(deposit.lockup.periods_total().unwrap(), 3);
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deposit.resolve_vesting(time).unwrap();
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assert_eq!(deposit.vested(time).unwrap(), 0);
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assert_eq!(deposit.amount_unlocked(time), 15);
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assert_eq!(
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deposit.lockup.seconds_left(time),
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initial_deposit.lockup.seconds_left(time)
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);
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assert_eq!(deposit.lockup.period_current(time).unwrap(), 0);
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assert_eq!(deposit.lockup.periods_total().unwrap(), 2);
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assert_eq!(amount_initially_locked(&deposit), 20);
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time = 1001 + 3 * month;
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assert_eq!(deposit.vested(time).unwrap(), 20);
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assert_eq!(deposit.lockup.period_current(time).unwrap(), 2);
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assert_eq!(deposit.lockup.periods_total().unwrap(), 2);
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deposit.resolve_vesting(time).unwrap();
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assert_eq!(deposit.vested(time).unwrap(), 0);
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assert_eq!(deposit.amount_unlocked(time), 35);
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assert_eq!(
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deposit.lockup.seconds_left(time),
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initial_deposit.lockup.seconds_left(time)
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);
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assert_eq!(deposit.lockup.period_current(time).unwrap(), 0);
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assert_eq!(deposit.lockup.periods_total().unwrap(), 0);
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assert_eq!(amount_initially_locked(&deposit), 0);
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Ok(())
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}
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#[test]
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pub fn far_future_lockup_start_test() -> Result<()> {
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// Check that voting power stays correct even if the lockup is very far in the
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// future, or at least more than lockup_saturation_secs in the future.
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let day: i64 = 86_400;
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let saturation: i64 = 5 * day;
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let lockup_start = 10_000_000_000; // arbitrary point
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let deposit = DepositEntry {
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|
amount_deposited_native: 10_000,
|
|
amount_initially_locked_native: 10_000,
|
|
lockup: Lockup {
|
|
start_ts: lockup_start,
|
|
end_ts: lockup_start + 2 * day,
|
|
kind: Daily,
|
|
reserved: [0; 15],
|
|
},
|
|
is_used: true,
|
|
allow_clawback: false,
|
|
voting_mint_config_idx: 0,
|
|
reserved: [0; 29],
|
|
};
|
|
let voting_mint_config = VotingMintConfig {
|
|
mint: Pubkey::default(),
|
|
grant_authority: Pubkey::default(),
|
|
baseline_vote_weight_scaled_factor: 1_000_000_000, // 1x
|
|
max_extra_lockup_vote_weight_scaled_factor: 1_000_000_000, // 1x
|
|
lockup_saturation_secs: saturation as u64,
|
|
digit_shift: 0,
|
|
reserved1: [0; 7],
|
|
reserved2: [0; 7],
|
|
};
|
|
|
|
let baseline_vote_weight =
|
|
voting_mint_config.baseline_vote_weight(deposit.amount_deposited_native)?;
|
|
assert_eq!(baseline_vote_weight, 10_000);
|
|
let max_locked_vote_weight = voting_mint_config
|
|
.max_extra_lockup_vote_weight(deposit.amount_initially_locked_native)?;
|
|
assert_eq!(max_locked_vote_weight, 10_000);
|
|
|
|
// The timestamp 100_000 is very far before the lockup_start timestamp
|
|
let withdrawable = deposit.amount_unlocked(100_000);
|
|
assert_eq!(withdrawable, 0);
|
|
let voting_power = deposit.voting_power(&voting_mint_config, 100_000).unwrap();
|
|
assert_eq!(voting_power, 20_000);
|
|
|
|
let voting_power = deposit
|
|
.voting_power(&voting_mint_config, lockup_start - saturation)
|
|
.unwrap();
|
|
assert_eq!(voting_power, 20_000);
|
|
|
|
let voting_power = deposit
|
|
.voting_power(&voting_mint_config, lockup_start - saturation + day)
|
|
.unwrap();
|
|
assert_eq!(voting_power, 20_000);
|
|
|
|
let voting_power = deposit
|
|
.voting_power(&voting_mint_config, lockup_start - saturation + day + 1)
|
|
.unwrap();
|
|
assert_eq!(voting_power, 19_999);
|
|
|
|
let voting_power = deposit
|
|
.voting_power(&voting_mint_config, lockup_start - saturation + 2 * day)
|
|
.unwrap();
|
|
assert_eq!(voting_power, 19_000); // the second cliff has only 4/5th of lockup period left
|
|
|
|
let voting_power = deposit
|
|
.voting_power(&voting_mint_config, lockup_start - saturation + 2 * day + 1)
|
|
.unwrap();
|
|
assert_eq!(voting_power, 18_999);
|
|
|
|
Ok(())
|
|
}
|
|
|
|
#[test]
|
|
pub fn guaranteed_lockup_test() -> Result<()> {
|
|
// Check that constant lockups are handled correctly.
|
|
let day: i64 = 86_400;
|
|
let saturation = (10 * day) as u64;
|
|
let start = 10_000_000_000; // arbitrary point
|
|
let deposit = DepositEntry {
|
|
amount_deposited_native: 10_000,
|
|
amount_initially_locked_native: 10_000,
|
|
lockup: Lockup {
|
|
start_ts: start,
|
|
end_ts: start + 5 * day,
|
|
kind: Constant,
|
|
reserved: [0; 15],
|
|
},
|
|
is_used: true,
|
|
allow_clawback: false,
|
|
voting_mint_config_idx: 0,
|
|
reserved: [0; 29],
|
|
};
|
|
|
|
let v = |curr_offset, at_offset| {
|
|
deposit
|
|
.voting_power_locked_guaranteed(
|
|
start + curr_offset,
|
|
start + at_offset,
|
|
100,
|
|
saturation,
|
|
)
|
|
.unwrap()
|
|
};
|
|
|
|
assert_eq!(v(0, 0), 50);
|
|
assert_eq!(v(-day, 0), 40);
|
|
assert_eq!(v(-100 * day, 0), 0);
|
|
assert_eq!(v(-100 * day, -98 * day), 30);
|
|
assert_eq!(v(0, day), 40);
|
|
assert_eq!(v(0, 5 * day), 0);
|
|
assert_eq!(v(0, 50 * day), 0);
|
|
assert_eq!(v(day, day), 50);
|
|
assert_eq!(v(day, 2 * day,), 40);
|
|
assert_eq!(v(day, 20 * day), 0);
|
|
assert_eq!(v(50 * day, 50 * day), 50);
|
|
assert_eq!(v(50 * day, 51 * day), 40);
|
|
assert_eq!(v(50 * day, 80 * day), 0);
|
|
|
|
Ok(())
|
|
}
|
|
}
|