(use-trait sip-010-token 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.sip-010-v1a.sip-010-trait)
(use-trait liquidity-token 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.liquidity-token-trait-v2a.liquidity-token-trait)
(define-constant contract-owner tx-sender)
(define-constant no-liquidity-err (err u4161))
;; (define-constant transfer-failed-err (err u4162))
(define-constant not-owner-err (err u4163))
(define-constant no-fee-to-address-err (err u4164))
(define-constant invalid-pair-err (err u4165))
(define-constant no-such-position-err (err u4166))
(define-constant balance-too-low-err (err u4167))
(define-constant too-many-pairs-err (err u4168))
(define-constant pair-already-exists-err (err u4169))
(define-constant wrong-token-err (err u4170))
(define-constant too-much-slippage-err (err u4171))
(define-constant transfer-x-failed-err (err u4172))
(define-constant transfer-y-failed-err (err u4173))
(define-constant value-out-of-range-err (err u4174))
(define-constant no-fee-x-err (err u4105))
(define-constant no-fee-y-err (err u4176))
(define-constant pair-token-already-used-err (err u4177))
(define-constant fee-contract-err (err u4178))
(define-constant not-upgraded-err (err u4179))
(define-constant lp-data-set-err (err u4180))
(define-constant lp-data-get-err (err u4181))
(define-constant SAFE_TRANSFER_AMOUNT_ERR (err u4182))
(define-constant SAFE_BURN_AMOUNT_ERR (err u4183))
(define-constant SAFE_MINT_AMOUNT_ERR (err u4184))
;; for future use, or debug
(define-constant e10-err (err u4120))
(define-constant e11-err (err u4121))
(define-constant e12-err (err u4122))
(define-map pairs-map
{ pair-id: uint }
{
token-x: principal,
token-y: principal,
liquidity-token: principal
}
)
(define-map pairs-token-map
{ pair-token: principal}
{ exist: uint}
)
(define-map pairs-data-map
{
token-x: principal,
token-y: principal,
}
{
liquidity-token: principal
}
)
(define-data-var pair-count uint u0)
(define-read-only (get-pair-details (token-x principal) (token-y principal))
(unwrap-panic (map-get? pairs-data-map { token-x: token-x, token-y: token-y }))
)
(define-read-only (get-pair-contracts (pair-id uint))
(unwrap-panic (map-get? pairs-map { pair-id: pair-id }))
)
(define-read-only (get-pair-count)
(ok (var-get pair-count))
)
(define-private (safe-transfer-to-lp (token <sip-010-token>) (from principal) (to <liquidity-token>) (amount uint))
(let (
(start-amount-lp (try! (contract-call? token get-balance (contract-of to))))
(start-amount-user (try! (contract-call? token get-balance from)))
(transfer-result (try! (contract-call? token transfer amount from (contract-of to) none)))
(end-amount-lp (try! (contract-call? token get-balance (contract-of to))))
(end-amount-user (try! (contract-call? token get-balance from)))
)
(asserts! (is-eq amount (- end-amount-lp start-amount-lp)) SAFE_TRANSFER_AMOUNT_ERR)
(asserts! (is-eq amount (- start-amount-user end-amount-user)) SAFE_TRANSFER_AMOUNT_ERR)
(ok true)
)
)
(define-private (safe-transfer-from-lp (token <sip-010-token>) (from <liquidity-token>) (to principal) (amount uint))
(let (
(start-amount-lp (try! (contract-call? token get-balance (contract-of from))))
(start-amount-user (try! (contract-call? token get-balance to)))
(transfer-result (try! (as-contract (contract-call? from transfer-token amount token to))))
(end-amount-lp (try! (contract-call? token get-balance (contract-of from))))
(end-amount-user (try! (contract-call? token get-balance to)))
)
(asserts! (is-eq amount (- end-amount-user start-amount-user)) SAFE_TRANSFER_AMOUNT_ERR)
(asserts! (is-eq amount (- start-amount-lp end-amount-lp)) SAFE_TRANSFER_AMOUNT_ERR)
(ok true)
)
)
(define-private (safe-burn (lp <liquidity-token>) (user principal) (amount uint))
(let (
(start-amount-user (try! (contract-call? lp get-balance user)))
(transfer-result (try! (contract-call? lp burn user amount)))
(end-amount-user (try! (contract-call? lp get-balance user)))
)
(asserts! (is-eq amount (- start-amount-user end-amount-user)) SAFE_BURN_AMOUNT_ERR)
(ok true)
)
)
(define-private (safe-mint (lp <liquidity-token>) (user principal) (amount uint))
(let (
(start-amount-user (try! (contract-call? lp get-balance user)))
(transfer-result (try! (contract-call? lp mint user amount)))
(end-amount-user (try! (contract-call? lp get-balance user)))
)
(asserts! (is-eq amount (- end-amount-user start-amount-user)) SAFE_MINT_AMOUNT_ERR)
(ok true)
)
)
(define-public (create-pair (token-x-trait <sip-010-token>) (token-y-trait <sip-010-token>) (token-liquidity-trait <liquidity-token>) (pair-name (string-ascii 32)) (x uint) (y uint))
(let
(
(name-x (try! (contract-call? token-x-trait get-name)))
(name-y (try! (contract-call? token-y-trait get-name)))
(token-x (contract-of token-x-trait))
(token-y (contract-of token-y-trait))
(token-liquidity (contract-of token-liquidity-trait))
(pair-id (+ (var-get pair-count) u1))
(pair-data {
shares-total: u0,
balance-x: u0,
balance-y: u0,
fee-balance-x: u0,
fee-balance-y: u0,
fee-to-address: contract-owner,
liquidity-token: (contract-of token-liquidity-trait),
name: pair-name,
})
)
;;TODO Check if the lp token is valid
(asserts!
(and
(is-none (map-get? pairs-data-map { token-x: token-x, token-y: token-y }))
(is-none (map-get? pairs-data-map { token-x: token-y, token-y: token-x }))
(is-none (map-get? pairs-token-map { pair-token: token-liquidity}))
)
pair-already-exists-err
)
(unwrap! (contract-call? token-liquidity-trait initialize-swap token-x token-y) invalid-pair-err)
(unwrap! (contract-call? token-liquidity-trait set-lp-data pair-data token-x token-y) lp-data-set-err)
(map-set pairs-data-map { token-x: token-x, token-y: token-y } {liquidity-token: (contract-of token-liquidity-trait)})
(map-set pairs-token-map { pair-token: token-liquidity} {exist: u1})
(map-set pairs-map { pair-id: pair-id } { token-x: token-x, token-y: token-y, liquidity-token: (contract-of token-liquidity-trait)})
(var-set pair-count pair-id)
(try! (add-to-position token-x-trait token-y-trait token-liquidity-trait x y))
(print { object: "pair", action: "created", data: pair-data })
(ok true)
)
)
;; since we can't use a constant to refer to contract address, here what x and y are
;; (define-constant x-token 'SP2NC4YKZWM2YMCJV851VF278H9J50ZSNM33P3JM1.my-token)
;; (define-constant y-token 'SP1QR3RAGH3GEME9WV7XB0TZCX6D5MNDQP97D35EH.my-token)
(define-public (add-to-position (token-x-trait <sip-010-token>) (token-y-trait <sip-010-token>) (token-liquidity-trait <liquidity-token>) (x uint) (y uint) )
(let
(
(token-x (contract-of token-x-trait))
(token-y (contract-of token-y-trait))
(pair (unwrap! (contract-call? token-liquidity-trait get-lp-data) lp-data-get-err))
;; (pair (unwrap-panic (map-get? pairs-data-map { token-x: token-x, token-y: token-y })))
(contract-address (contract-of token-liquidity-trait))
(recipient-address tx-sender)
(balance-x (get balance-x pair))
(balance-y (get balance-y pair))
(lp (asserts! (is-eq (get liquidity-token pair) (contract-of token-liquidity-trait)) wrong-token-err))
(new-shares
(if (is-eq (get shares-total pair) u0)
(sqrti (* x y)) ;; burn a fraction of initial lp token to avoid attack as described in WP https://uniswap.org/whitepaper.pdf
(/ (* x (get shares-total pair)) balance-x)
)
)
(new-y
(if (is-eq (get shares-total pair) u0)
y
(/ (* x balance-y) balance-x)
)
)
(pair-updated (merge pair {
shares-total: (+ new-shares (get shares-total pair)),
balance-x: (+ balance-x x),
balance-y: (+ balance-y new-y)
}))
)
(try! (safe-transfer-to-lp token-x-trait tx-sender token-liquidity-trait x))
(try! (safe-transfer-to-lp token-y-trait tx-sender token-liquidity-trait new-y))
;; (asserts! (is-ok (contract-call? token-x-trait transfer x tx-sender contract-address none)) transfer-x-failed-err)
;; (asserts! (is-ok (contract-call? token-y-trait transfer new-y tx-sender contract-address none)) transfer-y-failed-err)
(unwrap! (contract-call? token-liquidity-trait set-lp-data pair-updated token-x token-y) lp-data-set-err)
;; (try! (contract-call? token-liquidity-trait mint recipient-address new-shares))
(try! (safe-mint token-liquidity-trait recipient-address new-shares))
(print { object: "pair", action: "liquidity-added", data: pair-updated })
(ok true)
)
)
;; ;; reduce the amount of liquidity the sender provides to the pool
;; ;; to close, use u100
(define-public (reduce-position (token-x-trait <sip-010-token>) (token-y-trait <sip-010-token>) (token-liquidity-trait <liquidity-token>) (percent uint))
(let
(
(token-x (contract-of token-x-trait))
(token-y (contract-of token-y-trait))
(pair (unwrap! (contract-call? token-liquidity-trait get-lp-data) lp-data-get-err))
(balance-x (get balance-x pair))
(balance-y (get balance-y pair))
(lp (asserts! (is-eq (get liquidity-token pair) (contract-of token-liquidity-trait)) wrong-token-err))
(shares (unwrap! (contract-call? token-liquidity-trait get-balance tx-sender) lp-data-get-err))
(shares-total (get shares-total pair))
;; (sender tx-sender)
(withdrawal (/ (* shares percent) u100))
(withdrawal-x (/ (* withdrawal balance-x) shares-total))
(withdrawal-y (/ (* withdrawal balance-y) shares-total))
(pair-updated
(merge pair
{
shares-total: (- shares-total withdrawal),
balance-x: (- (get balance-x pair) withdrawal-x),
balance-y: (- (get balance-y pair) withdrawal-y)
}
)
)
)
(asserts! (<= percent u100) value-out-of-range-err)
(try! (safe-transfer-from-lp token-x-trait token-liquidity-trait tx-sender withdrawal-x))
(try! (safe-transfer-from-lp token-y-trait token-liquidity-trait tx-sender withdrawal-y))
;; (asserts! (is-ok (as-contract (contract-call? token-liquidity-trait transfer-token withdrawal-x token-x-trait sender))) transfer-x-failed-err)
;; (asserts! (is-ok (as-contract (contract-call? token-liquidity-trait transfer-token withdrawal-y token-y-trait sender))) transfer-y-failed-err)
(unwrap! (contract-call? token-liquidity-trait set-lp-data pair-updated token-x token-y) lp-data-set-err)
;; (try! (contract-call? token-liquidity-trait burn tx-sender withdrawal))
(try! (safe-burn token-liquidity-trait tx-sender withdrawal))
(print { object: "pair", action: "liquidity-removed", data: pair-updated })
(ok (list withdrawal-x withdrawal-y))
)
)
;; exchange known dx of x-token for whatever dy of y-token based on current liquidity, returns (dx dy)
;; the swap will not happen if can't get at least min-dy back
(define-public (swap-x-for-y (token-x-trait <sip-010-token>) (token-y-trait <sip-010-token>) (token-liquidity-trait <liquidity-token>) (dx uint) (min-dy uint))
;; calculate dy
;; calculate fee on dx
;; transfer
;; update balances
(let
(
(token-x (contract-of token-x-trait))
(token-y (contract-of token-y-trait))
(pair (unwrap! (contract-call? token-liquidity-trait get-lp-data) lp-data-get-err))
(balance-x (get balance-x pair))
(balance-y (get balance-y pair))
(contract-address (contract-of token-liquidity-trait))
(sender tx-sender)
(fee-1 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-1) fee-contract-err))
(fee-2 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-2) fee-contract-err))
(fee-3 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-3) fee-contract-err))
(fee-4 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-4) fee-contract-err))
(dy (/ (* fee-1 balance-y dx) (+ (* fee-2 balance-x) (* fee-1 dx)))) ;; overall fee is 30 bp, all for the pool, or 25 bp for pool and 5 bp for operator
(fee (/ (* fee-3 dx) fee-4)) ;; 5 bp
(pair-updated
(merge pair
{
balance-x: (+ (get balance-x pair) (- dx fee)),
balance-y: (- (get balance-y pair) dy),
fee-balance-x: (+ fee (get fee-balance-x pair))
}
)
)
)
(asserts! (< min-dy dy) too-much-slippage-err)
(try! (safe-transfer-to-lp token-x-trait tx-sender token-liquidity-trait dx))
(try! (safe-transfer-from-lp token-y-trait token-liquidity-trait tx-sender dy))
;; (asserts! (is-ok (contract-call? token-x-trait transfer dx sender contract-address none)) transfer-x-failed-err)
;; (asserts! (is-ok (as-contract (contract-call? token-liquidity-trait transfer-token dy token-y-trait sender))) transfer-y-failed-err)
(unwrap! (contract-call? token-liquidity-trait set-lp-data pair-updated token-x token-y) lp-data-set-err)
(print { object: "pair", action: "swap-x-for-y", data: pair-updated })
(ok (list dx dy))
)
)
;; exchange known dy for whatever dx based on liquidity, returns (dx dy)
;; the swap will not happen if can't get at least min-dx back
(define-public (swap-y-for-x (token-x-trait <sip-010-token>) (token-y-trait <sip-010-token>) (token-liquidity-trait <liquidity-token>) (dy uint) (min-dx uint))
;; calculate dx
;; calculate fee on dy
;; transfer
;; update balances
(let ((token-x (contract-of token-x-trait))
(token-y (contract-of token-y-trait))
(pair (unwrap! (contract-call? token-liquidity-trait get-lp-data) lp-data-get-err))
(balance-x (get balance-x pair))
(balance-y (get balance-y pair))
(contract-address (contract-of token-liquidity-trait))
(sender tx-sender)
(fee-1 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-1) fee-contract-err))
(fee-2 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-2) fee-contract-err))
(fee-3 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-3) fee-contract-err))
(fee-4 (unwrap! (contract-call? 'SP1Z92MPDQEWZXW36VX71Q25HKF5K2EPCJ304F275.stackswap-swap-fee-v1a get-fee-4) fee-contract-err))
;; check formula, vs x-for-y???
(dx (/ (* fee-1 balance-x dy) (+ (* fee-2 balance-y) (* fee-1 dy)))) ;; overall fee is 30 bp, all for the pool
(fee (/ (* fee-3 dy) fee-4)) ;; 0 bp
(pair-updated (merge pair {
balance-x: (- (get balance-x pair) dx),
balance-y: (+ (get balance-y pair) (- dy fee)),
fee-balance-y: (+ fee (get fee-balance-y pair))
})))
(asserts! (< min-dx dx) too-much-slippage-err)
(try! (safe-transfer-from-lp token-x-trait token-liquidity-trait tx-sender dx))
(try! (safe-transfer-to-lp token-y-trait tx-sender token-liquidity-trait dy))
;; (asserts! (is-ok (as-contract (contract-call? token-liquidity-trait transfer-token dx token-x-trait sender))) transfer-x-failed-err)
;; (asserts! (is-ok (contract-call? token-y-trait transfer dy sender contract-address none)) transfer-y-failed-err)
(unwrap! (contract-call? token-liquidity-trait set-lp-data pair-updated token-x token-y) lp-data-set-err)
(print { object: "pair", action: "swap-y-for-x", data: pair-updated })
(ok (list dx dy))
)
)
;; ;; activate the contract fee for swaps by setting the collection address, restricted to contract owner
(define-public (set-fee-to-address (token-x principal) (token-y principal) (token-liquidity-trait <liquidity-token>) (address principal))
(let (
(pair (unwrap! (contract-call? token-liquidity-trait get-lp-data) lp-data-get-err))
)
(asserts! (is-eq tx-sender contract-owner) not-owner-err)
(unwrap! (contract-call? token-liquidity-trait set-lp-data {
shares-total: (get shares-total pair),
balance-x: (get balance-y pair),
balance-y: (get balance-y pair),
fee-balance-x: (get fee-balance-y pair),
fee-balance-y: (get fee-balance-y pair),
fee-to-address: address,
name: (get name pair),
liquidity-token: (get liquidity-token pair),
} token-x token-y) lp-data-set-err)
(ok true)
)
)
;; ;; send the collected fees the fee-to-address
(define-public (collect-fees (token-x-trait <sip-010-token>) (token-y-trait <sip-010-token>) (token-liquidity-trait <liquidity-token>))
(let
(
(token-x (contract-of token-x-trait))
(token-y (contract-of token-y-trait))
(pair (unwrap! (contract-call? token-liquidity-trait get-lp-data) lp-data-get-err))
(address (get fee-to-address pair))
(fee-x (get fee-balance-x pair))
(fee-y (get fee-balance-y pair))
)
(print {fee-x: fee-x})
(print {fee-y: fee-y})
(asserts! (> fee-x u0) no-fee-x-err)
(asserts! (> fee-y u0) no-fee-y-err)
;; (asserts! (is-ok (as-contract (contract-call? token-liquidity-trait transfer-token fee-x token-x-trait address))) transfer-x-failed-err)
;; (asserts! (is-ok (as-contract (contract-call? token-liquidity-trait transfer-token fee-y token-y-trait address))) transfer-y-failed-err)
(try! (safe-transfer-from-lp token-x-trait token-liquidity-trait tx-sender fee-x))
(try! (safe-transfer-from-lp token-y-trait token-liquidity-trait tx-sender fee-y))
(unwrap! (contract-call? token-liquidity-trait set-lp-data {
shares-total: (get shares-total pair),
balance-x: (get balance-x pair),
balance-y: (get balance-y pair),
fee-balance-x: u0,
fee-balance-y: u0,
fee-to-address: (get fee-to-address pair),
name: (get name pair),
liquidity-token: (get liquidity-token pair),
} token-x token-y) lp-data-set-err)
(ok (list fee-x fee-y))
)
)