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swap retrieval
This commit is contained in:
Lars Brünjes
parent
089c383022
commit
bb2e6ee45b
2 changed files with 36 additions and 59 deletions
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@ -13,17 +13,19 @@
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module Week06.Oracle.Swap
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( offerSwap
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, retrieveSwaps
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) where
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import Control.Monad hiding (fmap)
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import Data.Aeson (FromJSON, ToJSON)
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import qualified Data.Map as Map
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import Data.Maybe (mapMaybe)
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import Data.Monoid (Last (..))
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import Data.Text (Text, pack)
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import GHC.Generics (Generic)
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import Plutus.Contract as Contract hiding (when)
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import qualified PlutusTx
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import PlutusTx.Prelude hiding (Semigroup(..), unless)
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import PlutusTx.Prelude hiding (Semigroup(..), unless, mapMaybe)
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import Ledger hiding (singleton)
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import Ledger.Constraints as Constraints
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import qualified Ledger.Typed.Scripts as Scripts
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@ -112,64 +114,34 @@ offerSwap oracle amt = do
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ledgerTx <- submitTxConstraints (swapInst oracle) tx
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awaitTxConfirmed $ txId ledgerTx
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logInfo @String $ "offered " ++ show amt ++ " lovelace for swap"
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{-
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startOracle :: forall w s. HasBlockchainActions s => Integer -> Contract w s Text Oracle
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startOracle fees = do
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pkh <- pubKeyHash <$> Contract.ownPubKey
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osc <- mapError (pack . show) (forgeContract pkh [(oracleTokenName, 1)] :: Contract w s CurrencyError OneShotCurrency)
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let cs = Currency.currencySymbol osc
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oracle = Oracle
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{ oSymbol = cs
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, oOperator = pkh
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, oFee = Ada.lovelaceValueOf fees
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}
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logInfo @String $ "forged oracle state token for oracle " ++ show oracle
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return oracle
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updateOracle :: forall w s. HasBlockchainActions s => Oracle -> Integer -> Contract w s Text ()
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updateOracle oracle x = do
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m <- findOracle oracle
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let c = Constraints.mustPayToTheScript x $ assetClassValue (oracleAsset oracle) 1
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case m of
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Nothing -> do
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ledgerTx <- submitTxConstraints (oracleInst oracle) c
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awaitTxConfirmed $ txId ledgerTx
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logInfo @String $ "set initial oracle value to " ++ show x
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Just (oref, o, _) -> do
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let lookups = Constraints.unspentOutputs (Map.singleton oref o) <>
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Constraints.scriptInstanceLookups (oracleInst oracle) <>
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Constraints.otherScript (oracleValidator oracle)
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tx = c <> Constraints.mustSpendScriptOutput oref (Redeemer $ PlutusTx.toData Update)
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ledgerTx <- submitTxConstraintsWith @Oracling lookups tx
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awaitTxConfirmed $ txId ledgerTx
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logInfo @String $ "updated oracle value to " ++ show x
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findOracle :: forall w s. HasBlockchainActions s => Oracle -> Contract w s Text (Maybe (TxOutRef, TxOutTx, Integer))
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findOracle oracle = do
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utxos <- Map.filter f <$> utxoAt (oracleAddress oracle)
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return $ case Map.toList utxos of
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[(oref, o)] -> do
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dh <- txOutDatumHash $ txOutTxOut o
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(Datum d) <- Map.lookup dh $ txData $ txOutTxTx o
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x <- PlutusTx.fromData d
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return (oref, o, x)
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_ -> Nothing
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findSwaps :: HasBlockchainActions s => Oracle -> (PubKeyHash -> Bool) -> Contract w s Text [(TxOutRef, TxOutTx, PubKeyHash)]
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findSwaps oracle p = do
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utxos <- utxoAt $ swapAddress oracle
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return $ mapMaybe g $ Map.toList utxos
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where
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f :: TxOutTx -> Bool
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f o = assetClassValueOf (txOutValue $ txOutTxOut o) (oracleAsset oracle) == 1
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f :: TxOutTx -> Maybe PubKeyHash
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f o = do
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dh <- txOutDatumHash $ txOutTxOut o
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(Datum d) <- Map.lookup dh $ txData $ txOutTxTx o
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PlutusTx.fromData d
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type OracleSchema = BlockchainActions .\/ Endpoint "update" Integer
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g :: (TxOutRef, TxOutTx) -> Maybe (TxOutRef, TxOutTx, PubKeyHash)
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g (oref, o) = do
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pkh <- f o
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guard $ p pkh
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return (oref, o, pkh)
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runOracle :: Integer -> Contract (Last Oracle) OracleSchema Text ()
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runOracle fees = do
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oracle <- startOracle fees
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tell $ Last $ Just oracle
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go oracle
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where
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go :: Oracle -> Contract (Last Oracle) OracleSchema Text a
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go oracle = do
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x <- endpoint @"update"
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updateOracle oracle x
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go oracle
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-}
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retrieveSwaps :: HasBlockchainActions s => Oracle -> Contract w s Text ()
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retrieveSwaps oracle = do
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pkh <- pubKeyHash <$> ownPubKey
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xs <- findSwaps oracle (== pkh)
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case xs of
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[] -> logInfo @String "no swaps found"
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_ -> do
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let lookups = Constraints.unspentOutputs (Map.fromList [(oref, o) | (oref, o, _) <- xs]) <>
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Constraints.otherScript (swapValidator oracle)
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tx = mconcat [Constraints.mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toData () | (oref, _, _) <- xs]
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ledgerTx <- submitTxConstraintsWith @Swapping lookups tx
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awaitTxConfirmed $ txId ledgerTx
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logInfo @String $ "retrieved " ++ show (length xs) ++ " swap(s)"
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@ -51,8 +51,13 @@ myTrace = do
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void $ Emulator.waitNSlots 3
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callEndpoint @"update" h 666
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void $ Emulator.waitNSlots 10
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h' <- activateContractWallet (Wallet 2) (offerSwap oracle 12000000 :: Contract () BlockchainActions Text ())
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void $ activateContractWallet (Wallet 2) (offerSwap oracle 12000000 :: Contract () BlockchainActions Text ())
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void $ Emulator.waitNSlots 10
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void $ activateContractWallet (Wallet 2) (offerSwap oracle 18000000 :: Contract () BlockchainActions Text ())
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void $ Emulator.waitNSlots 10
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void $ activateContractWallet (Wallet 2) (retrieveSwaps oracle :: Contract () BlockchainActions Text ())
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void $ Emulator.waitNSlots 10
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where
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getOracle :: ContractHandle (Last Oracle) OracleSchema Text -> EmulatorTrace Oracle
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