586 lines
24 KiB
Plaintext
586 lines
24 KiB
Plaintext
// Dexter
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// a decentralized Tezos exchange for XTZ and FA1.2
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// copyright: camlCase 2019-2020
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// version: 0.1.5.0
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// =============================================================================
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// Entrypoints
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// =============================================================================
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type entrypoint is
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| Approve of (address * nat * nat)
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| AddLiquidity of (address * nat * nat * timestamp)
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| RemoveLiquidity of (address * address * nat * tez * nat * timestamp)
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| XtzToToken of (address * nat * timestamp)
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| TokenToXtz of (address * address * nat * tez * timestamp)
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| BetForBakingRights of (key_hash * address * nat)
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| EndAuctionRound
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| UpdateTokenBalance of (nat)
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// the transfer entrypoint of the FA1.2 contract
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type token_contract_transfer is (address * address * nat);
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// =============================================================================
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// Storage
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// =============================================================================
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type baker_address is key_hash;
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type account is record
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balance : nat;
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allowances: map(address, nat);
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end
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// this is just to force big_maps as the first item of a pair on the top
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// so we can still use the old big map route without big map id for
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// convenience
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type s is record
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current_baker: option(baker_address);
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current_baker_candidate: option(baker_address * address * tez * nat);
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last_auction: timestamp;
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lqt_total: nat;
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token_address: address;
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token_balance: nat;
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rewards: (tez * nat);
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end
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type storage is record
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s: s;
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accounts: big_map(address, account);
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end
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// =============================================================================
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// Constants
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// =============================================================================
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const empty_allowances : map(address,nat) = map end;
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const empty_ops : list(operation) = list end;
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const no_baker_candidate: option(baker_address * address * tez * nat) = None;
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const no_baker: option(key_hash) = None;
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// 21 days
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// 86400 seconds * 21
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const dexter_cycle: int = 1814400;
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// =============================================================================
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// Helper Functions
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// =============================================================================
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function mutez_to_natural(const a: tez): nat is
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block {skip} with a / 1mutez
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function natural_to_mutez(const a: nat): tez is
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block {skip} with a * 1mutez
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// this will fail if provided a negative number
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function int_to_nat(const error: string ; const a: int): nat is
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block {
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var result : nat := 0n;
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if (a >= 0) then block {
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result := abs(a);
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} else block {
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failwith(error)
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};
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} with result;
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// get an account from the big_map, if one does not exist for a particular
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// address then create one.
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function get_account(const a: address ; const m: big_map(address, account)): account is
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block { skip } with (
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case (m[a]) of
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| None -> record balance = 0n; allowances = empty_allowances; end
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| Some(account) -> account
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end
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);
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function update_allowance(const owner : address;
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const spender : address;
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const updated_allowance: nat;
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var storage : storage):
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storage is
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block {
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if (spender =/= owner) then block {
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var account: account := get_account(owner, storage.accounts);
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account.allowances[spender] := updated_allowance;
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storage.accounts[owner] := record balance = account.balance; allowances = account.allowances; end;
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} else {
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skip;
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}
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} with storage;
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// if sender is owner, return amount, otherwise check if sender has permission
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// if true then return amount, otherwise fail
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function get_sender_allowance(const owner: address ; const storage: storage): nat is
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block {
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var result: nat := 0n;
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case storage.accounts[owner] of
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| None -> failwith("2")
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| Some(account) -> block {
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if sender =/= owner then block {
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case account.allowances[sender] of
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| None -> failwith("3")
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| Some(allowance) -> result := allowance
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end;
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} else block {
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result := account.balance
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}
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}
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end;
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} with result;
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function get_current_candidate_bet (const storage: storage): (tez * nat) is
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block {
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var current_candidate_bet: (tez * nat) := (0mutez, 0n);
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case (storage.s.current_baker_candidate) of
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| None -> skip
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| Some(current_baker_candidate) -> current_candidate_bet := (current_baker_candidate.2, current_baker_candidate.3)
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end
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} with current_candidate_bet;
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// there might be some zero division edge cases
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function get_xtz_pool (const current_candidate_bet_xtz: tez ; const storage: storage): (tez) is
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block {
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const time_since_last_auction: int = now - storage.s.last_auction;
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const days_since_last_auction: int = time_since_last_auction / 86400;
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var xtz_pool : tez := 0mutez;
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if (days_since_last_auction < dexter_cycle) then block {
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const released_rewards : tez = (storage.s.rewards.0 / abs((days_since_last_auction * 1000 / dexter_cycle))) / 1000n;
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const unreleased_rewards: tez = storage.s.rewards.0 - released_rewards;
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xtz_pool := balance - current_candidate_bet_xtz - unreleased_rewards - amount;
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} else block {
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// the slow reward wait has passed, all the rewards are released
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xtz_pool := balance - current_candidate_bet_xtz - amount;
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};
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} with xtz_pool;
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// there might be some zero division edge cases
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function get_token_pool (const current_candidate_bet_token: nat ; const storage: storage): (nat) is
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block {
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const time_since_last_auction: int = now - storage.s.last_auction;
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const days_since_last_auction: int = time_since_last_auction / 86400;
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var token_pool : nat := 0n;
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if (days_since_last_auction < dexter_cycle) then block {
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const reward_days : int = days_since_last_auction;
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const released_rewards : nat = (storage.s.rewards.1 / abs((reward_days * 1000 / dexter_cycle))) / 1000n;
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const unreleased_rewards: nat = abs(storage.s.rewards.1 - released_rewards);
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token_pool := abs(storage.s.token_balance - current_candidate_bet_token - unreleased_rewards);
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} else block {
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// the slow reward wait has passed, all the rewards are released
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token_pool := abs(storage.s.token_balance - current_candidate_bet_token)
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};
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} with token_pool;
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// =============================================================================
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// Entrypoint Functions
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// =============================================================================
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function approve(const spender : address;
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const allowance: nat;
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const current_allowance: nat;
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var storage : storage):
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(list(operation) * storage) is
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block {
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if (spender =/= sender) then block {
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// get the sender's account
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// if the account does not exist, fail, we do not want to create accounts here
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// creating accounts should be done in add_liquidity
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const account: account = get_account(sender, storage.accounts);
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var sender_allowances: map(address, nat) := account.allowances;
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sender_allowances[spender] := allowance;
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storage.accounts[sender] := record balance = account.balance; allowances = sender_allowances; end;
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} else block {
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failwith("1");
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}
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} with (empty_ops, storage);
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// it is assumed that the exchange contract has permission from the FA1.2 token
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// to manage the assets of the user. It is the responsibility of the dApp
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// developer to handle permissions.
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function add_liquidity(const owner : address;
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const min_lqt_created : nat;
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const max_tokens_deposited: nat;
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const deadline : timestamp;
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var storage : storage):
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(list(operation) * storage) is
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block {
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// add_liquidity performs a transfer to the token contract, we need to
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// return the operations
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var op_list: list(operation) := nil;
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if (now < deadline) then skip else block {
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failwith("4");
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};
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if (max_tokens_deposited > 0n) then skip else block {
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failwith("5");
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};
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if (amount > 0mutez) then skip else block {
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failwith("6");
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};
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if (storage.s.lqt_total > 0n) then block {
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// lqt_total greater than zero
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// use the existing exchange rate
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if (min_lqt_created > 0n) then skip else block {
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failwith("7");
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};
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const current_candidate_bet: (tez * nat) = get_current_candidate_bet(storage);
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const xtz_pool : nat = mutez_to_natural(get_xtz_pool(current_candidate_bet.0, storage));
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const token_pool : nat = get_token_pool(current_candidate_bet.1, storage);
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const nat_amount : nat = mutez_to_natural(amount);
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const tokens_deposited : nat = nat_amount * token_pool / xtz_pool;
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const lqt_minted : nat = nat_amount * storage.s.lqt_total / xtz_pool;
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if (max_tokens_deposited >= tokens_deposited) then skip else block {
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failwith("8");
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};
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if (lqt_minted >= min_lqt_created) then skip else block {
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failwith("9");
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};
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const account: account = get_account(owner, storage.accounts);
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const new_balance: nat = account.balance + lqt_minted;
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storage.accounts[owner] := record balance = new_balance; allowances = account.allowances; end;
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storage.s.lqt_total := storage.s.lqt_total + lqt_minted;
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storage.s.token_balance := storage.s.token_balance + tokens_deposited;
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// send FA1.2 from owner to exchange
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const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
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const op1: operation = transaction((owner, self_address, tokens_deposited), 0mutez, token_contract);
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op_list := list op1; end;
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} else block {
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// initial add liquidity
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if (amount >= 1tz) then skip else block {
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failwith("10");
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};
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const tokens_deposited : nat = max_tokens_deposited;
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const current_candidate_bet: (tez * nat) = get_current_candidate_bet(storage);
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const initial_liquidity : nat = mutez_to_natural(balance - current_candidate_bet.0);
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storage.s.lqt_total := initial_liquidity;
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storage.accounts[owner] := record balance = initial_liquidity; allowances = empty_allowances; end;
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storage.s.token_balance := tokens_deposited;
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// send FA1.2 tokens from owner to exchange
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const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
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const op1: operation = transaction((owner, self_address, tokens_deposited), 0mutez, token_contract);
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op_list := list op1; end;
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}
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} with (op_list, storage);
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function remove_liquidity(const owner : address;
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const to_ : address;
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const lqt_burned : nat;
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const min_xtz_withdrawn : tez;
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const min_tokens_withdrawn : nat;
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const deadline : timestamp;
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var storage : storage):
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(list(operation) * storage) is
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block {
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var op_list: list(operation) := nil;
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if (now < deadline) then skip else block {
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failwith("11");
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};
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if (min_xtz_withdrawn > 0mutez) then skip else block {
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failwith("12");
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};
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if (min_tokens_withdrawn > 0n) then skip else block {
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failwith("13");
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};
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if (lqt_burned > 0n) then skip else block {
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failwith("14");
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};
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// returns total if sender is owner, otherwise looks it up
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const lqt: nat = get_sender_allowance(owner, storage);
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if (lqt >= lqt_burned) then skip else block {
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failwith("15");
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};
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if (storage.s.lqt_total > 0n) then skip else block {
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failwith("16");
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};
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const current_candidate_bet: (tez * nat) = get_current_candidate_bet(storage);
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const xtz_withdrawn : tez = natural_to_mutez(lqt_burned * mutez_to_natural(balance - current_candidate_bet.0) / storage.s.lqt_total);
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if (xtz_withdrawn >= min_xtz_withdrawn) then skip else block {
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failwith("17");
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};
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const token_pool : nat = get_token_pool(current_candidate_bet.1, storage);
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const tokens_withdrawn: nat = lqt_burned * token_pool / storage.s.lqt_total;
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if (tokens_withdrawn >= min_tokens_withdrawn) then skip else block {
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failwith("18");
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};
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const account: account = get_account(owner, storage.accounts);
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if (account.balance >= lqt_burned) then skip else block {
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failwith("19");
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};
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const new_balance: nat = int_to_nat("33", account.balance - lqt_burned);
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storage.accounts[owner] := record balance = new_balance; allowances = account.allowances; end;
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storage.s.lqt_total := int_to_nat("34", storage.s.lqt_total - lqt_burned);
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storage.s.token_balance := int_to_nat("35", storage.s.token_balance - tokens_withdrawn);
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// update allowance
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// lqt - lqt_burned is safe, we have already checed that lqt >= lqt_burned
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storage := update_allowance(owner, sender, int_to_nat("36", lqt - lqt_burned), storage);
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// send xtz_withdrawn to to_ address
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const to_contract: contract(unit) = get_contract(to_);
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const op1: operation = transaction(unit, xtz_withdrawn, to_contract);
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// send tokens_withdrawn to to address
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// if tokens_withdrawn if greater than storage.s.token_balance, this will fail
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const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
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const op2: operation = transaction((self_address, to_, tokens_withdrawn), 0mutez, token_contract);
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op_list := list op1; op2; end
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} with (op_list, storage);
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function xtz_to_token(const to_ : address;
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const min_tokens_bought: nat;
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const deadline : timestamp;
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var storage : storage):
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(list(operation) * storage) is
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block {
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var op_list: list(operation) := nil;
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if (now < deadline) then skip else block {
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failwith("20");
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};
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const current_candidate_bet: (tez * nat) = get_current_candidate_bet(storage);
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const xtz_pool : nat = mutez_to_natural(get_xtz_pool(current_candidate_bet.0, storage));
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const nat_amount : nat = mutez_to_natural(amount);
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const token_pool : nat = get_token_pool(current_candidate_bet.1, storage);
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const tokens_bought : nat = (nat_amount * 997n * token_pool) / (xtz_pool * 1000n + (nat_amount * 997n));
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if (tokens_bought >= min_tokens_bought) then skip else block {
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failwith("21");
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};
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storage.s.token_balance := int_to_nat("32", storage.s.token_balance - tokens_bought);
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// send tokens_withdrawn to to address
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// if tokens_bought is greater than storage.s.token_balance, this will fail
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const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
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const op: operation = transaction((self_address, to_, tokens_bought), 0mutez, token_contract);
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// append internal operations
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op_list := list op; end;
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} with (op_list, storage);
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function token_to_xtz(const owner : address; // the address of the owner of FA1.2
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const to_ : address;
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const tokens_sold : nat;
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const min_xtz_bought: tez;
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const deadline : timestamp;
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var storage : storage):
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(list(operation) * storage) is
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block {
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var op_list: list(operation) := nil;
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if (now < deadline) then skip else block {
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failwith("22");
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};
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const current_candidate_bet: (tez * nat) = get_current_candidate_bet(storage);
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const xtz_pool : tez = get_xtz_pool(current_candidate_bet.0, storage);
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const token_pool : nat = get_token_pool(current_candidate_bet.1, storage);
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const xtz_bought : tez = natural_to_mutez((tokens_sold * 997n * mutez_to_natural(xtz_pool)) / (token_pool * 1000n + (tokens_sold * 997n)));
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if (xtz_bought >= min_xtz_bought) then skip else block {
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failwith("23");
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};
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storage.s.token_balance := storage.s.token_balance + tokens_sold;
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// send xtz_bought to to_ address
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const to_contract: contract(unit) = get_contract(to_);
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const op1: operation = transaction(unit, xtz_bought, to_contract);
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// send tokens_sold to the exchange address
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// this assumes that the exchange has an allowance for the token and owner in FA1.2
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const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
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const op2: operation = transaction((owner, self_address, tokens_sold), 0mutez, token_contract);
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// append internal operations
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op_list := list op1; op2; end;
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} with (op_list, storage);
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function assert_valid_baker (const current_baker: option(key_hash);
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const candidate: key_hash): (operation * operation) is
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block {
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// test the candidate baker, if it is valid this will not fail
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const test_set_delegate_operation: operation = set_delegate(Some(candidate));
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// reset to the current baker
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const reset_set_delegate_operation: operation = set_delegate(current_baker);
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} with (test_set_delegate_operation, reset_set_delegate_operation);
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function bet_for_baking_rights (const candidate : key_hash;
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const token_source : address;
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const max_tokens_bet : nat;
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var storage : storage):
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(list(operation) * storage) is
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block {
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var op_list: list(operation) := nil;
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// this is a trick to assert that the provided baker address is valid
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case (storage.s.current_baker_candidate) of
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| None -> block {
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const op_pair: (operation * operation) = assert_valid_baker(storage.s.current_baker, candidate);
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op_list := op_pair.0 # op_list;
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op_list := op_pair.1 # op_list;
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}
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| Some(current_baker_candidate) -> block {
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if (current_baker_candidate.0 = candidate) then skip else block {
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const op_pair: (operation * operation) = assert_valid_baker(storage.s.current_baker, candidate);
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op_list := op_pair.0 # op_list;
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op_list := op_pair.1 # op_list;
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};
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}
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end;
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// now we are sure it is a valid baker
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|
|
// set a minimum bet
|
|
if (max_tokens_bet > 0n) then skip else block {
|
|
failwith("24");
|
|
};
|
|
|
|
if (amount > 0mutez) then skip else block {
|
|
failwith("25");
|
|
};
|
|
|
|
const current_candidate_bet : (tez * nat) = get_current_candidate_bet(storage);
|
|
|
|
if (amount > current_candidate_bet.0) then skip else { failwith("26") };
|
|
|
|
const xtz_pool : nat = mutez_to_natural(get_xtz_pool(current_candidate_bet.0, storage));
|
|
const token_pool : nat = get_token_pool(current_candidate_bet.1, storage);
|
|
const nat_amount : nat = mutez_to_natural(amount);
|
|
const tokens_deposited : nat = nat_amount * token_pool / xtz_pool;
|
|
|
|
if (tokens_deposited > current_candidate_bet.1) then skip else { failwith("27") };
|
|
if (tokens_deposited > max_tokens_bet) then skip else { failwith("28") };
|
|
|
|
case (storage.s.current_baker_candidate) of
|
|
| None -> block {
|
|
// add the tokens_deposited to the token_balance
|
|
storage.s.token_balance := storage.s.token_balance + tokens_deposited;
|
|
}
|
|
| Some(current_baker_candidate) -> block {
|
|
// return rejected candidates tez and tokens to previous candidate
|
|
const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
|
|
const return_token_op: operation = transaction((self_address, current_baker_candidate.1, current_baker_candidate.3), 0mutez, token_contract);
|
|
op_list := return_token_op # op_list;
|
|
|
|
const to_contract: contract(unit) = get_contract(current_baker_candidate.1);
|
|
const return_xtz_op: operation = transaction(unit, current_baker_candidate.2, to_contract);
|
|
op_list := return_xtz_op # op_list;
|
|
|
|
// remove the tokens from the current_baker_candidate
|
|
// add the tokens_deposited to the token_balance
|
|
storage.s.token_balance := abs(storage.s.token_balance - current_baker_candidate.3) + tokens_deposited;
|
|
}
|
|
end;
|
|
|
|
storage.s.current_baker_candidate := Some((candidate,token_source,amount,tokens_deposited));
|
|
|
|
// send FA1.2 from owner to exchange, dexter needs permission to transfer these tokens
|
|
const token_contract: contract(token_contract_transfer) = get_entrypoint("%transfer", storage.s.token_address);
|
|
const xtz_to_dexter_op: operation = transaction((token_source, self_address, tokens_deposited), 0mutez, token_contract);
|
|
op_list := xtz_to_dexter_op # op_list;
|
|
|
|
} with (op_list, storage);
|
|
|
|
function end_auction_round(var storage : storage) : (list(operation) * storage) is
|
|
block {
|
|
var op_list: list(operation) := nil;
|
|
// 604800 seconds is one week
|
|
if (now > storage.s.last_auction + 604800) then skip else {failwith("29")};
|
|
|
|
case (storage.s.current_baker_candidate) of
|
|
| None -> block {
|
|
const set_delegate_op: operation = set_delegate(no_baker);
|
|
op_list := set_delegate_op # op_list;
|
|
}
|
|
| Some(current_baker_candidate) -> block {
|
|
case (storage.s.current_baker) of
|
|
| None -> block {
|
|
storage.s.current_baker := Some(current_baker_candidate.0);
|
|
storage.s.current_baker_candidate := no_baker_candidate;
|
|
storage.s.token_balance := storage.s.token_balance + current_baker_candidate.3;
|
|
storage.s.last_auction := now;
|
|
const set_delegate_op: operation = set_delegate(storage.s.current_baker);
|
|
op_list := set_delegate_op # op_list;
|
|
}
|
|
| Some(current_baker) -> block {
|
|
if (current_baker = current_baker_candidate.0) then block {
|
|
storage.s.current_baker_candidate := no_baker_candidate;
|
|
storage.s.token_balance := storage.s.token_balance + current_baker_candidate.3;
|
|
storage.s.last_auction := now;
|
|
} else {
|
|
storage.s.current_baker := Some(current_baker_candidate.0);
|
|
storage.s.current_baker_candidate := no_baker_candidate;
|
|
storage.s.token_balance := storage.s.token_balance + current_baker_candidate.3;
|
|
storage.s.last_auction := now;
|
|
const set_delegate_op: operation = set_delegate(storage.s.current_baker);
|
|
op_list := set_delegate_op # op_list;
|
|
}
|
|
}
|
|
end;
|
|
}
|
|
end;
|
|
|
|
} with (op_list, storage);
|
|
|
|
function update_token_balance(const token_balance: nat ; var storage : storage) : (list(operation) * storage) is
|
|
block {
|
|
var op_list: list(operation) := nil;
|
|
if (sender =/= storage.s.token_address) then {
|
|
failwith("31");
|
|
} else {
|
|
storage.s.token_balance := token_balance;
|
|
}
|
|
} with (op_list, storage);
|
|
|
|
// =============================================================================
|
|
// Main
|
|
// =============================================================================
|
|
|
|
function main (const entrypoint : entrypoint ; const storage : storage) : (list(operation) * storage) is
|
|
(case entrypoint of
|
|
| Approve(xs) -> approve(xs.0,xs.1,xs.2,storage)
|
|
| AddLiquidity(xs) -> add_liquidity(xs.0,xs.1,xs.2,xs.3,storage)
|
|
| RemoveLiquidity(xs) -> remove_liquidity(xs.0,xs.1,xs.2,xs.3,xs.4,xs.5,storage)
|
|
| XtzToToken(xs) -> xtz_to_token(xs.0,xs.1,xs.2,storage)
|
|
| TokenToXtz(xs) -> token_to_xtz(xs.0,xs.1,xs.2,xs.3,xs.4,storage)
|
|
| BetForBakingRights(xs) -> bet_for_baking_rights(xs.0,xs.1,xs.2,storage)
|
|
| EndAuctionRound -> end_auction_round(storage)
|
|
| UpdateTokenBalance(xs) -> update_token_balance(xs, storage)
|
|
end);
|