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parameterized contract
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@ -13,6 +13,7 @@ library
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exposed-modules: Week02.Burn
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, Week02.FortyTwo
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, Week02.Gift
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, Week02.Parameterized
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, Week02.Typed
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build-depends: aeson
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, base ^>=4.14.1.0
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119
code/week02/src/Week02/Parameterized.hs
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119
code/week02/src/Week02/Parameterized.hs
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@ -0,0 +1,119 @@
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveAnyClass #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeOperators #-}
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module Week02.Parameterized
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( give
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, grab
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, ParameterizedSchema
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, endpoints
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, schemas
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, registeredKnownCurrencies
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, printJson
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, printSchemas
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, ensureKnownCurrencies
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, stage
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) where
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import Control.Monad hiding (fmap)
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import Data.Aeson (ToJSON, FromJSON)
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import Data.Map as Map
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import Data.Text (Text)
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import Data.Void (Void)
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import GHC.Generics (Generic)
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import Plutus.Contract hiding (when)
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import PlutusTx (Data (..))
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import qualified PlutusTx
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import PlutusTx.Prelude hiding (Semigroup(..), unless)
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import Ledger hiding (singleton)
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import Ledger.Constraints as Constraints
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import qualified Ledger.Scripts as Scripts
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import qualified Ledger.Typed.Scripts as Scripts
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import Ledger.Ada as Ada
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import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage)
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import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
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import Playground.Types (KnownCurrency (..))
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import Prelude (Semigroup (..))
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import Schema (ToSchema)
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import Text.Printf (printf)
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{-# INLINABLE mkParameterizedValidator #-}
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mkParameterizedValidator :: Integer -> () -> Integer -> ValidatorCtx -> Bool
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mkParameterizedValidator r () n _ = traceIfFalse "UNEXPECTED REDEEMER" (n == r)
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data Parameterizing
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instance Scripts.ScriptType Parameterizing where
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type instance RedeemerType Parameterizing = Integer
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type instance DatumType Parameterizing = ()
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parameterizedInstance :: Integer -> Scripts.ScriptInstance Parameterizing
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parameterizedInstance r = Scripts.validator @Parameterizing
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($$(PlutusTx.compile [|| mkParameterizedValidator ||])
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`PlutusTx.applyCode`
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PlutusTx.liftCode r)
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$$(PlutusTx.compile [|| wrap ||])
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where
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wrap = Scripts.wrapValidator @() @Integer
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parameterizedValidator :: Integer -> Validator
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parameterizedValidator = Scripts.validatorScript . parameterizedInstance
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parameterizedHash :: Integer -> Ledger.ValidatorHash
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parameterizedHash = Scripts.validatorHash . parameterizedValidator
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parameterizedAddress :: Integer -> Ledger.Address
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parameterizedAddress = ScriptAddress . parameterizedHash
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type ParameterizedSchema =
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BlockchainActions
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.\/ Endpoint "give" GiveParams
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.\/ Endpoint "grab" GrabParams
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data GiveParams = GiveParams
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{ giveAmount :: Integer
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, giveParameter :: Integer
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} deriving (Generic, ToJSON, FromJSON, ToSchema)
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data GrabParams = GrabParams
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{ grabParameter :: Integer
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, grabRedeemer :: Integer
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} deriving (Generic, ToJSON, FromJSON, ToSchema)
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give :: (HasBlockchainActions s, AsContractError e) => GiveParams -> Contract w s e ()
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give p = do
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let amount = giveAmount p
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let tx = mustPayToTheScript () $ Ada.lovelaceValueOf amount
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ledgerTx <- submitTxConstraints (parameterizedInstance $ giveParameter p) tx
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void $ awaitTxConfirmed $ txId ledgerTx
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logInfo @String $ printf "made a gift of %d lovelace" amount
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grab :: forall w s e. (HasBlockchainActions s, AsContractError e) => GrabParams -> Contract w s e ()
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grab p = do
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let par = grabParameter p
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utxos <- utxoAt $ ScriptAddress $ parameterizedHash par
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let orefs = fst <$> Map.toList utxos
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lookups = Constraints.unspentOutputs utxos <>
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Constraints.otherScript (parameterizedValidator par)
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tx :: TxConstraints Void Void
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tx = mconcat [mustSpendScriptOutput oref $ Redeemer $ I $ grabRedeemer p | oref <- orefs]
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ledgerTx <- submitTxConstraintsWith @Void lookups tx
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void $ awaitTxConfirmed $ txId ledgerTx
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logInfo @String $ "collected gifts"
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endpoints :: Contract () ParameterizedSchema Text ()
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endpoints = (give' `select` grab') >> endpoints
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where
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give' = endpoint @"give" >>= give
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grab' = endpoint @"grab" >>= grab
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mkSchemaDefinitions ''ParameterizedSchema
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mkKnownCurrencies []
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