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lib.rs
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lib.rs
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use std::convert::TryInto;
use std::fmt;
use std::collections::{HashMap, HashSet};
use degen_swap::degen::{global_get_degen, global_set_degen, DegenTrait};
use degen_swap::DegenSwapPool;
use near_contract_standards::storage_management::{
StorageBalance, StorageBalanceBounds, StorageManagement,
};
use near_sdk::serde::{Deserialize, Serialize};
use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
use near_sdk::collections::{LookupMap, UnorderedSet, Vector, UnorderedMap};
use near_sdk::json_types::{ValidAccountId, U128};
use near_sdk::{
assert_one_yocto, env, log, near_bindgen, AccountId, Balance, PanicOnDefault, Promise,
PromiseResult, StorageUsage, BorshStorageKey, PromiseOrValue, ext_contract, Gas
};
use utils::{NO_DEPOSIT, GAS_FOR_BASIC_OP};
use crate::account_deposit::*;
pub use crate::action::{SwapAction, SwapByOutputAction, Action, ActionResult, get_tokens_in_actions, assert_all_same_action_type};
use crate::errors::*;
use crate::admin_fee::AdminFees;
use crate::pool::Pool;
use crate::simple_pool::SimplePool;
use crate::stable_swap::StableSwapPool;
use crate::rated_swap::{RatedSwapPool, rate::{RateTrait, global_get_rate, global_set_rate}};
use crate::utils::{check_token_duplicates, pair_rated_price_to_vec_u8, TokenCache};
pub use crate::custom_keys::*;
pub use crate::views::{PoolInfo, ShadowRecordInfo, RatedPoolInfo, StablePoolInfo, ContractMetadata, RatedTokenInfo, DegenTokenInfo, AddLiquidityPrediction, RefStorageState};
pub use crate::token_receiver::{AddLiquidityInfo, VIRTUAL_ACC};
pub use crate::shadow_actions::*;
pub use crate::unit_lpt_cumulative_infos::*;
pub use crate::oracle::*;
pub use crate::degen_swap::*;
pub use crate::pool_limit_info::*;
pub use crate::client_echo_limit::*;
mod account_deposit;
mod action;
mod errors;
mod admin_fee;
mod legacy;
mod multi_fungible_token;
mod owner;
mod pool;
mod simple_pool;
mod stable_swap;
mod rated_swap;
mod degen_swap;
mod oracle;
mod storage_impl;
mod token_receiver;
mod utils;
mod views;
mod custom_keys;
mod shadow_actions;
mod unit_lpt_cumulative_infos;
mod pool_limit_info;
mod client_echo_limit;
mod donation;
mod event;
near_sdk::setup_alloc!();
#[derive(BorshStorageKey, BorshSerialize)]
pub(crate) enum StorageKey {
Pools,
Accounts,
Shares { pool_id: u32 },
Whitelist,
Guardian,
AccountTokens {account_id: AccountId},
Frozenlist,
Referral,
ShadowRecord {account_id: AccountId},
UnitShareCumulativeInfo,
PoolLimit,
ClientEchoTokenIdWhitelistItem,
ClientEchoSenderIdWhitelistItem,
}
#[derive(BorshDeserialize, BorshSerialize, Serialize, Deserialize, Eq, PartialEq, Clone)]
#[serde(crate = "near_sdk::serde")]
#[cfg_attr(not(target_arch = "wasm32"), derive(Debug))]
pub enum RunningState {
Running, Paused
}
impl fmt::Display for RunningState {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
RunningState::Running => write!(f, "Running"),
RunningState::Paused => write!(f, "Paused"),
}
}
}
#[ext_contract(ext_self)]
pub trait SelfCallbacks {
fn update_token_rate_callback(&mut self, token_id: AccountId);
fn update_degen_token_price_callback(&mut self, token_id: AccountId);
fn batch_update_degen_token_by_price_oracle_callback(&mut self, token_id_decimals_map: HashMap<AccountId, u8>);
fn batch_update_degen_token_by_pyth_oracle_callback(&mut self, price_id_token_id_map: HashMap<pyth_oracle::PriceIdentifier, AccountId>);
}
#[near_bindgen]
#[derive(BorshSerialize, BorshDeserialize, PanicOnDefault)]
pub struct Contract {
/// Account of the owner.
owner_id: AccountId,
/// Account of the boost_farm contract.
boost_farm_id: AccountId,
/// Account of the burrowland contract.
burrowland_id: AccountId,
/// Admin fee rate in total fee.
admin_fee_bps: u32,
/// List of all the pools.
pools: Vector<Pool>,
/// Accounts registered, keeping track all the amounts deposited, storage and more.
accounts: LookupMap<AccountId, VAccount>,
/// Set of whitelisted tokens by "owner".
whitelisted_tokens: UnorderedSet<AccountId>,
/// Set of guardians.
guardians: UnorderedSet<AccountId>,
/// Running state
state: RunningState,
/// Set of frozenlist tokens
frozen_tokens: UnorderedSet<AccountId>,
/// Map of referrals
referrals: UnorderedMap<AccountId, u32>,
cumulative_info_record_interval_sec: u32,
unit_share_cumulative_infos: UnorderedMap<u64, VUnitShareCumulativeInfo>,
wnear_id: Option<AccountId>,
auto_whitelisted_postfix: HashSet<String>
}
#[near_bindgen]
impl Contract {
#[init]
pub fn new(owner_id: ValidAccountId, boost_farm_id: ValidAccountId, burrowland_id: ValidAccountId, exchange_fee: u32, referral_fee: u32) -> Self {
Self {
owner_id: owner_id.as_ref().clone(),
boost_farm_id: boost_farm_id.as_ref().clone(),
burrowland_id: burrowland_id.as_ref().clone(),
admin_fee_bps: exchange_fee + referral_fee,
pools: Vector::new(StorageKey::Pools),
accounts: LookupMap::new(StorageKey::Accounts),
whitelisted_tokens: UnorderedSet::new(StorageKey::Whitelist),
guardians: UnorderedSet::new(StorageKey::Guardian),
state: RunningState::Running,
frozen_tokens: UnorderedSet::new(StorageKey::Frozenlist),
referrals: UnorderedMap::new(StorageKey::Referral),
cumulative_info_record_interval_sec: 12 * 60, // 12 min
unit_share_cumulative_infos: UnorderedMap::new(StorageKey::UnitShareCumulativeInfo),
wnear_id: None,
auto_whitelisted_postfix: HashSet::new()
}
}
/// Adds new "Simple Pool" with given tokens and given fee.
/// Attached NEAR should be enough to cover the added storage.
#[payable]
pub fn add_simple_pool(&mut self, tokens: Vec<ValidAccountId>, fee: u32) -> u64 {
self.assert_contract_running();
check_token_duplicates(&tokens);
self.internal_add_pool(Pool::SimplePool(SimplePool::new(
self.pools.len() as u32,
tokens,
fee,
)))
}
/// Adds new "Stable Pool" with given tokens, decimals, fee and amp.
/// It is limited to owner or guardians, cause a complex and correct config is needed.
/// tokens: pool tokens in this stable swap.
/// decimals: each pool tokens decimal, needed to make them comparable.
/// fee: total fee of the pool, admin fee is inclusive.
/// amp_factor: algorithm parameter, decide how stable the pool will be.
#[payable]
pub fn add_stable_swap_pool(
&mut self,
tokens: Vec<ValidAccountId>,
decimals: Vec<u8>,
fee: u32,
amp_factor: u64,
) -> u64 {
assert!(self.is_owner_or_guardians(), "{}", ERR100_NOT_ALLOWED);
check_token_duplicates(&tokens);
self.internal_add_pool(Pool::StableSwapPool(StableSwapPool::new(
self.pools.len() as u32,
tokens,
decimals,
amp_factor as u128,
fee,
)))
}
///
#[payable]
pub fn add_rated_swap_pool(
&mut self,
tokens: Vec<ValidAccountId>,
decimals: Vec<u8>,
fee: u32,
amp_factor: u64,
) -> u64 {
assert!(self.is_owner_or_guardians(), "{}", ERR100_NOT_ALLOWED);
check_token_duplicates(&tokens);
self.internal_add_pool(Pool::RatedSwapPool(RatedSwapPool::new(
self.pools.len() as u32,
tokens,
decimals,
amp_factor as u128,
fee,
)))
}
#[payable]
pub fn add_degen_swap_pool(
&mut self,
tokens: Vec<ValidAccountId>,
decimals: Vec<u8>,
fee: u32,
amp_factor: u64,
) -> u64 {
assert!(self.is_owner_or_guardians(), "{}", ERR100_NOT_ALLOWED);
check_token_duplicates(&tokens);
self.internal_add_pool(Pool::DegenSwapPool(DegenSwapPool::new(
self.pools.len() as u32,
tokens,
decimals,
amp_factor as u128,
fee,
)))
}
#[payable]
pub fn execute_actions_in_va(
&mut self,
use_tokens: HashMap<AccountId, U128>,
actions: Vec<Action>,
referral_id: Option<ValidAccountId>,
) -> HashMap<AccountId, U128> {
self.assert_contract_running();
assert_ne!(actions.len(), 0, "{}", ERR72_AT_LEAST_ONE_SWAP);
let sender_id = env::predecessor_account_id();
let mut account = self.internal_unwrap_account(&sender_id);
// Validate that all tokens are whitelisted if no deposit (e.g. trade with access key).
if env::attached_deposit() == 0 {
for action in &actions {
for token in action.tokens() {
assert!(
account.get_balance(&token).is_some()
|| self.is_whitelisted_token(&token),
"{}",
// [AUDIT_05]
ERR27_DEPOSIT_NEEDED
);
}
}
}
let mut virtual_account: Account = Account::new(&String::from(VIRTUAL_ACC));
let referral_info :Option<(AccountId, u32)> = referral_id
.as_ref().and_then(|rid| self.referrals.get(rid.as_ref()))
.map(|fee| (referral_id.unwrap().into(), fee));
for (use_token, use_amount) in use_tokens.iter() {
account.withdraw(use_token, use_amount.0);
virtual_account.deposit(use_token, use_amount.0);
}
let _ = self.internal_execute_actions(
&mut virtual_account,
&referral_info,
&actions,
ActionResult::None,
);
let mut result = HashMap::new();
for (token, amount) in virtual_account.tokens.to_vec() {
if amount > 0 {
account.deposit(&token, amount);
result.insert(token, amount.into());
}
}
virtual_account.tokens.clear();
self.internal_save_account(&sender_id, account);
result
}
/// [AUDIT_03_reject(NOPE action is allowed by design)]
/// [AUDIT_04]
/// Executes generic set of actions.
/// If referrer provided, pays referral_fee to it.
/// If no attached deposit, outgoing tokens used in swaps must be whitelisted.
#[payable]
pub fn execute_actions(
&mut self,
actions: Vec<Action>,
referral_id: Option<ValidAccountId>,
) -> ActionResult {
self.assert_contract_running();
assert_ne!(actions.len(), 0, "{}", ERR72_AT_LEAST_ONE_SWAP);
let sender_id = env::predecessor_account_id();
let mut account = self.internal_unwrap_account(&sender_id);
// Validate that all tokens are whitelisted if no deposit (e.g. trade with access key).
if env::attached_deposit() == 0 {
for action in &actions {
for token in action.tokens() {
assert!(
account.get_balance(&token).is_some()
|| self.is_whitelisted_token(&token),
"{}",
// [AUDIT_05]
ERR27_DEPOSIT_NEEDED
);
}
}
}
let referral_info :Option<(AccountId, u32)> = referral_id
.as_ref().and_then(|rid| self.referrals.get(rid.as_ref()))
.map(|fee| (referral_id.unwrap().into(), fee));
let result =
self.internal_execute_actions(&mut account, &referral_info, &actions, ActionResult::None);
self.internal_save_account(&sender_id, account);
result
}
/// Execute set of swap actions between pools.
/// If referrer provided, pays referral_fee to it.
/// If no attached deposit, outgoing tokens used in swaps must be whitelisted.
#[payable]
pub fn swap(&mut self, actions: Vec<SwapAction>, referral_id: Option<ValidAccountId>) -> U128 {
U128(
self.execute_actions(
actions
.into_iter()
.map(|swap_action| Action::Swap(swap_action))
.collect(),
referral_id,
)
.to_amount(),
)
}
/// Execute set of swap_by_output actions between pools.
/// If referrer provided, pays referral_fee to it.
/// If no attached deposit, outgoing tokens used in swaps must be whitelisted.
#[payable]
pub fn swap_by_output(&mut self, actions: Vec<SwapByOutputAction>, referral_id: Option<ValidAccountId>) -> U128 {
U128(
self.execute_actions(
actions
.into_iter()
.map(|swap_by_output_action| Action::SwapByOutput(swap_by_output_action))
.collect(),
referral_id,
)
.to_amount(),
)
}
/// Add liquidity from already deposited amounts to given pool.
#[payable]
pub fn add_liquidity(
&mut self,
pool_id: u64,
amounts: Vec<U128>,
min_amounts: Option<Vec<U128>>,
) -> U128 {
self.assert_contract_running();
assert!(
env::attached_deposit() > 0,
"{}", ERR35_AT_LEAST_ONE_YOCTO
);
self.internal_update_unit_share_cumulative_info(pool_id);
let prev_storage = env::storage_usage();
let sender_id = env::predecessor_account_id();
let mut amounts: Vec<u128> = amounts.into_iter().map(|amount| amount.into()).collect();
let mut pool = self.pools.get(pool_id).expect(ERR85_NO_POOL);
// feature frozenlist
self.assert_no_frozen_tokens(pool.tokens());
// Add amounts given to liquidity first. It will return the balanced amounts.
let shares = pool.add_liquidity(
&sender_id,
&mut amounts,
false
);
if let Some(min_amounts) = min_amounts {
// Check that all amounts are above request min amounts in case of front running that changes the exchange rate.
for (amount, min_amount) in amounts.iter().zip(min_amounts.iter()) {
assert!(amount >= &min_amount.0, "{}", ERR86_MIN_AMOUNT);
}
}
// [AUDITION_AMENDMENT] 2.3.7 Code Optimization (I)
let mut deposits = self.internal_unwrap_account(&sender_id);
let tokens = pool.tokens();
// Subtract updated amounts from deposits. This will fail if there is not enough funds for any of the tokens.
for i in 0..tokens.len() {
deposits.withdraw(&tokens[i], amounts[i]);
}
self.internal_save_account(&sender_id, deposits);
self.pools.replace(pool_id, &pool);
self.internal_check_storage(prev_storage);
U128(shares)
}
/// For stable swap pool, user can add liquidity with token's combination as his will.
/// But there is a little fee according to the bias of token's combination with the one in the pool.
/// pool_id: stable pool id. If simple pool is given, panic with unimplement.
/// amounts: token's combination (in pool tokens sequence) user want to add into the pool, a 0 means absent of that token.
/// min_shares: Slippage, if shares mint is less than it (cause of fee for too much bias), panic with ERR68_SLIPPAGE
#[payable]
pub fn add_stable_liquidity(
&mut self,
pool_id: u64,
amounts: Vec<U128>,
min_shares: U128,
) -> U128 {
self.assert_contract_running();
assert!(
env::attached_deposit() > 0,
"{}", ERR35_AT_LEAST_ONE_YOCTO
);
self.internal_update_unit_share_cumulative_info(pool_id);
let prev_storage = env::storage_usage();
let sender_id = env::predecessor_account_id();
let amounts: Vec<u128> = amounts.into_iter().map(|amount| amount.into()).collect();
let mut pool = self.pools.get(pool_id).expect(ERR85_NO_POOL);
// feature frozenlist
self.assert_no_frozen_tokens(pool.tokens());
// Add amounts given to liquidity first. It will return the balanced amounts.
let mint_shares = pool.add_stable_liquidity(
&sender_id,
&amounts,
min_shares.into(),
AdminFees::new(self.admin_fee_bps),
false
);
pool.assert_tvl_not_exceed_limit(pool_id);
// [AUDITION_AMENDMENT] 2.3.7 Code Optimization (I)
let mut deposits = self.internal_unwrap_account(&sender_id);
let tokens = pool.tokens();
// Subtract amounts from deposits. This will fail if there is not enough funds for any of the tokens.
for i in 0..tokens.len() {
deposits.withdraw(&tokens[i], amounts[i]);
}
self.internal_save_account(&sender_id, deposits);
self.pools.replace(pool_id, &pool);
self.internal_check_storage(prev_storage);
mint_shares.into()
}
// #[payable]
// pub fn add_rated_liquidity(
// &mut self,
// pool_id: u64,
// amounts: Vec<U128>,
// min_shares: U128,
// ) -> U128 {
// self.add_stable_liquidity(pool_id, amounts, min_shares)
// }
/// Remove liquidity from the pool and add tokens into user internal account.
#[payable]
pub fn remove_liquidity(&mut self, pool_id: u64, shares: U128, min_amounts: Vec<U128>) -> Vec<U128> {
assert_one_yocto();
self.assert_contract_running();
self.internal_update_unit_share_cumulative_info(pool_id);
let sender_id = env::predecessor_account_id();
let mut pool = self.pools.get(pool_id).expect(ERR85_NO_POOL);
let mut deposits = self.internal_unwrap_account(&sender_id);
if let Some(record) = deposits.get_shadow_record(pool_id) {
assert!(shares.0 <= record.free_shares(pool.share_balances(&sender_id)), "Not enough free shares");
}
// feature frozenlist
self.assert_no_frozen_tokens(pool.tokens());
let amounts = pool.remove_liquidity(
&sender_id,
shares.into(),
min_amounts
.into_iter()
.map(|amount| amount.into())
.collect(),
false
);
self.pools.replace(pool_id, &pool);
let tokens = pool.tokens();
for i in 0..tokens.len() {
deposits.deposit(&tokens[i], amounts[i]);
}
self.internal_save_account(&sender_id, deposits);
amounts
.into_iter()
.map(|amount| amount.into())
.collect()
}
/// For stable swap pool, LP can use it to remove liquidity with given token amount and distribution.
/// pool_id: the stable swap pool id. If simple pool is given, panic with Unimplement.
/// amounts: Each tokens (in pool tokens sequence) amounts user want get, a 0 means user don't want to get that token back.
/// max_burn_shares: This is slippage protection, if user request would burn shares more than it, panic with ERR68_SLIPPAGE
#[payable]
pub fn remove_liquidity_by_tokens(
&mut self, pool_id: u64,
amounts: Vec<U128>,
max_burn_shares: U128
) -> U128 {
assert_one_yocto();
self.assert_contract_running();
self.internal_update_unit_share_cumulative_info(pool_id);
let sender_id = env::predecessor_account_id();
let mut pool = self.pools.get(pool_id).expect(ERR85_NO_POOL);
let mut deposits = self.internal_unwrap_account(&sender_id);
let free_shares = if let Some(record) = deposits.get_shadow_record(pool_id) {
record.free_shares(pool.share_balances(&sender_id))
} else {
pool.share_balances(&sender_id)
};
// feature frozenlist
self.assert_no_frozen_tokens(pool.tokens());
let burn_shares = pool.remove_liquidity_by_tokens(
&sender_id,
amounts
.clone()
.into_iter()
.map(|amount| amount.into())
.collect(),
max_burn_shares.into(),
AdminFees::new(self.admin_fee_bps),
false
);
assert!(burn_shares <= free_shares, "Not enough free shares");
self.pools.replace(pool_id, &pool);
let tokens = pool.tokens();
for i in 0..tokens.len() {
deposits.deposit(&tokens[i], amounts[i].into());
}
self.internal_save_account(&sender_id, deposits);
burn_shares.into()
}
/// anyone can trigger an update for some rated token
pub fn update_token_rate(& self, token_id: ValidAccountId) -> PromiseOrValue<bool> {
let caller = env::predecessor_account_id();
let token_id: AccountId = token_id.into();
if let Some(rate) = global_get_rate(&token_id) {
log!("Caller {} invokes token {} rait async-update.", caller, token_id);
rate.async_update().then(ext_self::update_token_rate_callback(
token_id,
&env::current_account_id(),
NO_DEPOSIT,
GAS_FOR_BASIC_OP,
)).into()
} else {
log!("Caller {} invokes token {} rait async-update but it is not a valid token.", caller, token_id);
PromiseOrValue::Value(true)
}
}
/// the async return of update_token_rate
#[private]
pub fn update_token_rate_callback(&mut self, token_id: AccountId) {
let cross_call_result = if env::promise_results_count() == 1 {
let cross_call_result = match env::promise_result(0) {
PromiseResult::Successful(result) => result,
_ => env::panic(ERR124_CROSS_CALL_FAILED.as_bytes()),
};
cross_call_result
} else {
// Only SfraxRate + pyth
assert_eq!(env::promise_results_count(), 2, "{}", ERR123_TWO_PROMISE_RESULT);
let cross_call_result1 = match env::promise_result(0) {
PromiseResult::Successful(result) => result,
_ => env::panic(ERR124_CROSS_CALL_FAILED.as_bytes()),
};
let cross_call_result2 = match env::promise_result(1) {
PromiseResult::Successful(result) => result,
_ => env::panic(ERR124_CROSS_CALL_FAILED.as_bytes()),
};
pair_rated_price_to_vec_u8(cross_call_result1, cross_call_result2)
};
if let Some(mut rate) = global_get_rate(&token_id) {
let new_rate = rate.set(&cross_call_result);
global_set_rate(&token_id, &rate);
log!(
"Token {} got new rate {} from cross-contract call.",
token_id, new_rate
);
}
}
/// anyone can trigger a batch update for degen tokens
///
/// # Arguments
///
/// * `token_ids` - List of token IDs.
pub fn batch_update_degen_token_price(&self, token_ids: Vec<ValidAccountId>) {
internal_batch_update_degen_token_price(token_ids.into_iter().map(|v| v.into()).collect());
}
/// anyone can trigger an update for some degen token
pub fn update_degen_token_price(& self, token_id: ValidAccountId) {
let caller = env::predecessor_account_id();
let token_id: AccountId = token_id.into();
let degen = global_get_degen(&token_id);
log!("Caller {} invokes token {} rait async-update.", caller, token_id);
degen.sync_token_price(&token_id);
}
/// the async return of update_degen_token_price
#[private]
pub fn update_degen_token_price_callback(&mut self, token_id: AccountId) {
if let Some(cross_call_result) = near_sdk::promise_result_as_success() {
let mut degen = global_get_degen(&token_id);
let new_degen = degen.set_price(&cross_call_result);
global_set_degen(&token_id, °en);
log!(
"Token {} got new degen {} from cross-contract call.",
token_id, new_degen
);
}
}
}
/// Internal methods implementation.
impl Contract {
fn assert_contract_running(&self) {
match self.state {
RunningState::Running => (),
_ => env::panic(ERR51_CONTRACT_PAUSED.as_bytes()),
};
}
fn assert_no_frozen_tokens(&self, tokens: &[AccountId]) {
let frozens: Vec<&String> = tokens.iter()
.filter(
|token| self.frozen_tokens.contains(*token)
)
.collect();
assert_eq!(frozens.len(), 0, "{}", ERR52_FROZEN_TOKEN);
}
fn is_whitelisted_token(&self, token_id: &AccountId) -> bool {
self.whitelisted_tokens.contains(token_id) || self.auto_whitelisted_postfix.iter().any(|postfix| token_id.ends_with(postfix))
}
/// Check how much storage taken costs and refund the left over back.
/// Return the storage costs due to this call by far.
fn internal_check_storage(&self, prev_storage: StorageUsage) -> u128 {
let storage_cost = env::storage_usage()
.checked_sub(prev_storage)
.unwrap_or_default() as Balance
* env::storage_byte_cost();
let refund = env::attached_deposit()
.checked_sub(storage_cost)
.expect(
format!(
"ERR_STORAGE_DEPOSIT need {}, attatched {}",
storage_cost, env::attached_deposit()
).as_str()
);
if refund > 0 {
Promise::new(env::predecessor_account_id()).transfer(refund);
}
storage_cost
}
/// Adds given pool to the list and returns it's id.
/// If there is not enough attached balance to cover storage, fails.
/// If too much attached - refunds it back.
fn internal_add_pool(&mut self, mut pool: Pool) -> u64 {
let prev_storage = env::storage_usage();
let id = self.pools.len() as u64;
// exchange share was registered at creation time
pool.share_register(&env::current_account_id());
self.pools.push(&pool);
self.internal_check_storage(prev_storage);
id
}
fn get_degen_tokens_in_actions(&self, actions: &[Action]) -> HashSet<AccountId> {
let mut degen_tokens = HashSet::new();
actions.iter().for_each(|action| {
if let Pool::DegenSwapPool(p) = self.pools.get(action.get_pool_id()).expect(ERR85_NO_POOL) {
degen_tokens.extend(p.tokens().iter().cloned());
}
});
degen_tokens
}
/// Execute sequence of actions on given account. Modifies passed account.
/// Returns result of the last action.
fn internal_execute_actions(
&mut self,
account: &mut Account,
referral_info: &Option<(AccountId, u32)>,
actions: &[Action],
prev_result: ActionResult,
) -> ActionResult {
assert_all_same_action_type(actions);
// fronzen token feature
// [AUDITION_AMENDMENT] 2.3.8 Code Optimization (II)
self.assert_no_frozen_tokens(
&get_tokens_in_actions(actions)
.into_iter()
.map(|token| token)
.collect::<Vec<AccountId>>()
);
let mut result = prev_result;
match actions[0] {
Action::Swap(_) => {
for action in actions {
result = self.internal_execute_action(account, referral_info, action, result);
}
}
Action::SwapByOutput(_) => {
let mut prev_action: Option<&Action> = None;
for action in actions {
if let Some(U128(amount_out)) = action.get_amount_out() {
self.finalize_prev_swap_chain(account, prev_action, &result);
account.deposit(action.get_token_out(), amount_out);
} else {
assert!(prev_action.unwrap().get_token_in() == action.get_token_out());
}
result = self.internal_execute_action(account, referral_info, action, result);
prev_action = Some(action);
}
self.finalize_prev_swap_chain(account, prev_action, &result);
}
}
let degen_token_ids = self.get_degen_tokens_in_actions(actions).into_iter().collect::<Vec<_>>();
internal_batch_update_degen_token_price(degen_token_ids);
result
}
fn finalize_prev_swap_chain(&mut self, account: &mut Account, prev_action: Option<&Action>, prev_result: &ActionResult){
if prev_action.is_some() {
account.withdraw(prev_action.unwrap().get_token_in(), prev_result.to_amount());
}
}
/// Executes single action on given account. Modifies passed account. Returns a result based on type of action.
fn internal_execute_action(
&mut self,
account: &mut Account,
referral_info: &Option<(AccountId, u32)>,
action: &Action,
prev_result: ActionResult,
) -> ActionResult {
match action {
Action::Swap(swap_action) => {
let amount_in = swap_action
.amount_in
.map(|value| value.0)
.unwrap_or_else(|| prev_result.to_amount());
account.withdraw(&swap_action.token_in, amount_in);
let amount_out = self.internal_pool_swap(
swap_action.pool_id,
&swap_action.token_in,
amount_in,
&swap_action.token_out,
swap_action.min_amount_out.0,
referral_info,
);
account.deposit(&swap_action.token_out, amount_out);
// [AUDIT_02]
ActionResult::Amount(U128(amount_out))
}
Action::SwapByOutput(swap_by_output_action) => {
let amount_out = swap_by_output_action
.amount_out
.map(|value| value.0)
.unwrap_or_else(|| prev_result.to_amount());
let amount_in = self.internal_pool_swap_by_output(
swap_by_output_action.pool_id,
&swap_by_output_action.token_in,
amount_out,
&swap_by_output_action.token_out,
swap_by_output_action.max_amount_in.map(|v| v.0),
referral_info,
);
ActionResult::Amount(U128(amount_in))
}
}
}
/// Swaps given amount_in of token_in into token_out via given pool.
/// Should be at least min_amount_out or swap will fail (prevents front running and other slippage issues).
fn internal_pool_swap(
&mut self,
pool_id: u64,
token_in: &AccountId,
amount_in: u128,
token_out: &AccountId,
min_amount_out: u128,
referral_info: &Option<(AccountId, u32)>,
) -> u128 {
self.internal_update_unit_share_cumulative_info(pool_id);
let mut pool = self.pools.get(pool_id).expect(ERR85_NO_POOL);
let amount_out = pool.swap(
token_in,
amount_in,
token_out,
min_amount_out,
AdminFees {
admin_fee_bps: self.admin_fee_bps,
exchange_id: env::current_account_id(),
referral_info: referral_info.clone(),
},
false
);
self.pools.replace(pool_id, &pool);
amount_out
}
/// Swaps token_in into the given amount_out of token_out via a specified pool.
/// Should be at most max_amount_in or swap will fail (prevents front running and other slippage issues).
fn internal_pool_swap_by_output(
&mut self,
pool_id: u64,
token_in: &AccountId,
amount_out: u128,
token_out: &AccountId,
max_amount_in: Option<u128>,
referral_info: &Option<(AccountId, u32)>,
) -> u128 {
self.internal_update_unit_share_cumulative_info(pool_id);
let mut pool = self.pools.get(pool_id).expect(ERR85_NO_POOL);
let amount_in = pool.swap_by_output(
token_in,
amount_out,
token_out,
max_amount_in,
AdminFees {
admin_fee_bps: self.admin_fee_bps,
exchange_id: env::current_account_id(),
referral_info: referral_info.clone(),
},
false
);
self.pools.replace(pool_id, &pool);
amount_in
}
}
impl Contract {
fn internal_execute_actions_by_cache(
&self,
pool_cache: &mut HashMap<u64, Pool>,
token_cache: &mut TokenCache,
referral_info: &Option<(AccountId, u32)>,
actions: &[Action],
prev_result: ActionResult,
) {
assert_all_same_action_type(actions);
self.assert_no_frozen_tokens(
&get_tokens_in_actions(actions)
.into_iter()
.map(|token| token)
.collect::<Vec<AccountId>>()
);
let mut result = prev_result;
match actions[0] {
Action::Swap(_) => {
for action in actions {
result = self.internal_execute_action_by_cache(pool_cache, token_cache, referral_info, action, result);
}
}
Action::SwapByOutput(_) => {
let mut prev_action: Option<&Action> = None;
for action in actions {
if let Some(U128(amount_out)) = action.get_amount_out() {
self.finalize_prev_swap_chain_by_cache(token_cache, prev_action, &result);
token_cache.add(action.get_token_out(), amount_out);
} else {
assert!(prev_action.unwrap().get_token_in() == action.get_token_out());
}
result = self.internal_execute_action_by_cache(pool_cache, token_cache, referral_info, action, result);
prev_action = Some(action);
}
self.finalize_prev_swap_chain_by_cache(token_cache, prev_action, &result);
}
}
}
fn finalize_prev_swap_chain_by_cache(&self, token_cache: &mut TokenCache, prev_action: Option<&Action>, prev_result: &ActionResult){
if prev_action.is_some() {
token_cache.sub(prev_action.unwrap().get_token_in(), prev_result.to_amount());
}
}
fn internal_execute_action_by_cache(
&self,
pool_cache: &mut HashMap<u64, Pool>,
token_cache: &mut TokenCache,
referral_info: &Option<(AccountId, u32)>,
action: &Action,
prev_result: ActionResult,
) -> ActionResult {
match action {
Action::Swap(swap_action) => {
let amount_in = swap_action
.amount_in
.map(|value| value.0)
.unwrap_or_else(|| prev_result.to_amount());
token_cache.sub(&swap_action.token_in, amount_in);
let amount_out = self.internal_pool_swap_by_cache(
pool_cache,
swap_action.pool_id,
&swap_action.token_in,
amount_in,
&swap_action.token_out,
0,
referral_info,
);
token_cache.add(&swap_action.token_out, amount_out);
ActionResult::Amount(U128(amount_out))
}
Action::SwapByOutput(swap_by_output_action) => {
let amount_out = swap_by_output_action
.amount_out
.map(|value| value.0)
.unwrap_or_else(|| prev_result.to_amount());
let amount_in = self.internal_pool_swap_by_output_by_cache(
pool_cache,
swap_by_output_action.pool_id,
&swap_by_output_action.token_in,
amount_out,
&swap_by_output_action.token_out,
swap_by_output_action.max_amount_in.map(|v| v.0),
referral_info,
);
ActionResult::Amount(U128(amount_in))
}
}
}
fn internal_pool_swap_by_cache(
&self,
pool_cache: &mut HashMap<u64, Pool>,
pool_id: u64,
token_in: &AccountId,
amount_in: u128,
token_out: &AccountId,
min_amount_out: u128,
referral_info: &Option<(AccountId, u32)>,
) -> u128 {
let mut pool = pool_cache.remove(&pool_id).unwrap_or(self.pools.get(pool_id).expect(ERR85_NO_POOL));
let amount_out = pool.swap(
token_in,
amount_in,
token_out,
min_amount_out,
AdminFees {
admin_fee_bps: self.admin_fee_bps,
exchange_id: env::current_account_id(),
referral_info: referral_info.clone(),
},
true
);
pool_cache.insert(pool_id, pool);
amount_out
}
fn internal_pool_swap_by_output_by_cache(
&self,
pool_cache: &mut HashMap<u64, Pool>,
pool_id: u64,
token_in: &AccountId,
amount_out: u128,
token_out: &AccountId,
max_amount_in: Option<u128>,
referral_info: &Option<(AccountId, u32)>,
) -> u128 {
let mut pool = pool_cache.remove(&pool_id).unwrap_or(self.pools.get(pool_id).expect(ERR85_NO_POOL));
let amount_in = pool.swap_by_output(
token_in,
amount_out,
token_out,
max_amount_in,
AdminFees {
admin_fee_bps: self.admin_fee_bps,
exchange_id: env::current_account_id(),
referral_info: referral_info.clone(),
},
false
);
pool_cache.insert(pool_id, pool);
amount_in