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22
README.md
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@ -30,12 +30,25 @@
- The `EmulatorTrace`-monad.
- The `Contract`-monad.
- [Lecture #5](https://youtu.be/SsaVjSsPPcg)
- Values.
- Native Tokens.
- NFT's.
- [Lecture #6](https://youtu.be/24SHPHEc3zo)
- Oracles.
- Using the PAB.
## Code Examples
- Lecture #1: [English Auction](code/week01)
- Lecture #2: [Simple validation](code/week02)
- Lecture #3: [Script Context & Parameterized Contracts](code/week03)
- Lecture #4: [Monad, Traces & Contracts](code/week04)
- Lecture #5: [Native Tokens](code/week05)
- Lecture #6: [Oracles](code/week06)
## Exercises
@ -74,6 +87,15 @@
- Implement function `payTrace` in the [Homework](code/week04/src/Week04/Homework.hs) module.
- Handle exceptions thrown by `submitTx` in function `payContract` in the same module.
- Week #5
- Add a deadline to the minting policy in the [Homework1](code/week05/src/Week05/Homework1.hs) module.
- Fix the token name to the empty ByteString in the NFT contract in the [Homework2](code/week05/src/Week05/Homework2.hs) module.
- Week #6
- Get the Oracle demo running and extend it in some way.
## Some Plutus Modules
- [`Language.Marlowe.Semantics`](https://github.com/input-output-hk/plutus/blob/master/marlowe/src/Language/Marlowe/Semantics.hs), contains Marlowe types and semantics.

2
code/week02/plutus-pioneer-program-week02.cabal
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@ -16,6 +16,8 @@ library
, Week02.Homework2
, Week02.Gift
, Week02.IsData
, Week02.Solution1
, Week02.Solution2
, Week02.Typed
build-depends: aeson
, base ^>=4.14.1.0

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@ -0,0 +1,91 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
module Week02.Solution1 where
import Control.Monad hiding (fmap)
import Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract
import PlutusTx (Data (..))
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Scripts as Scripts hiding (validatorHash)
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Ada as Ada
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), String)
import Text.Printf (printf)
{-# INLINABLE mkValidator #-}
-- This should validate if and only if the two Booleans in the redeemer are equal!
mkValidator :: () -> (Bool, Bool) -> ScriptContext -> Bool
mkValidator () (b, c) _ = traceIfFalse "wrong redeemer" $ b == c
data Typed
instance Scripts.ValidatorTypes Typed where
type instance DatumType Typed = ()
type instance RedeemerType Typed = (Bool, Bool)
typedValidator :: Scripts.TypedValidator Typed
typedValidator = Scripts.mkTypedValidator @Typed
$$(PlutusTx.compile [|| mkValidator ||])
$$(PlutusTx.compile [|| wrap ||])
where
wrap = Scripts.wrapValidator @() @(Bool, Bool)
validator :: Validator
validator = Scripts.validatorScript typedValidator
valHash :: Ledger.ValidatorHash
valHash = Scripts.validatorHash typedValidator
scrAddress :: Ledger.Address
scrAddress = scriptAddress validator
type GiftSchema =
Endpoint "give" Integer
.\/ Endpoint "grab" (Bool, Bool)
give :: AsContractError e => Integer -> Contract w s e ()
give amount = do
let tx = mustPayToTheScript () $ Ada.lovelaceValueOf amount
ledgerTx <- submitTxConstraints typedValidator tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ printf "made a gift of %d lovelace" amount
grab :: forall w s e. AsContractError e => (Bool, Bool) -> Contract w s e ()
grab bs = do
utxos <- utxoAt scrAddress
let orefs = fst <$> Map.toList utxos
lookups = Constraints.unspentOutputs utxos <>
Constraints.otherScript validator
tx :: TxConstraints Void Void
tx = mconcat [mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toData bs | oref <- orefs]
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "collected gifts"
endpoints :: Contract () GiftSchema Text ()
endpoints = (give' `select` grab') >> endpoints
where
give' = endpoint @"give" >>= give
grab' = endpoint @"grab" >>= grab
mkSchemaDefinitions ''GiftSchema
mkKnownCurrencies []

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
module Week02.Solution2 where
import Control.Monad hiding (fmap)
import Data.Aeson (FromJSON, ToJSON)
import Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Ada as Ada
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), String)
import Text.Printf (printf)
data MyRedeemer = MyRedeemer
{ flag1 :: Bool
, flag2 :: Bool
} deriving (Generic, FromJSON, ToJSON, ToSchema)
PlutusTx.unstableMakeIsData ''MyRedeemer
{-# INLINABLE mkValidator #-}
-- This should validate if and only if the two Booleans in the redeemer are equal!
mkValidator :: () -> MyRedeemer -> ScriptContext -> Bool
mkValidator () (MyRedeemer b c) _ = traceIfFalse "wrong redeemer" $ b == c
data Typed
instance Scripts.ValidatorTypes Typed where
type instance DatumType Typed = ()
type instance RedeemerType Typed = MyRedeemer
typedValidator :: Scripts.TypedValidator Typed
typedValidator = Scripts.mkTypedValidator @Typed
$$(PlutusTx.compile [|| mkValidator ||])
$$(PlutusTx.compile [|| wrap ||])
where
wrap = Scripts.wrapValidator @() @MyRedeemer
validator :: Validator
validator = Scripts.validatorScript typedValidator
valHash :: Ledger.ValidatorHash
valHash = Scripts.validatorHash typedValidator
scrAddress :: Ledger.Address
scrAddress = scriptAddress validator
type GiftSchema =
Endpoint "give" Integer
.\/ Endpoint "grab" MyRedeemer
give :: AsContractError e => Integer -> Contract w s e ()
give amount = do
let tx = mustPayToTheScript () $ Ada.lovelaceValueOf amount
ledgerTx <- submitTxConstraints typedValidator tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ printf "made a gift of %d lovelace" amount
grab :: forall w s e. AsContractError e => MyRedeemer -> Contract w s e ()
grab r = do
utxos <- utxoAt scrAddress
let orefs = fst <$> Map.toList utxos
lookups = Constraints.unspentOutputs utxos <>
Constraints.otherScript validator
tx :: TxConstraints Void Void
tx = mconcat [mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toData r | oref <- orefs]
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "collected gifts"
endpoints :: Contract () GiftSchema Text ()
endpoints = (give' `select` grab') >> endpoints
where
give' = endpoint @"give" >>= give
grab' = endpoint @"grab" >>= grab
mkSchemaDefinitions ''GiftSchema
mkKnownCurrencies []

2
code/week03/plutus-pioneer-program-week03.cabal
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@ -13,6 +13,8 @@ library
exposed-modules: Week03.Homework1
, Week03.Homework2
, Week03.Parameterized
, Week03.Solution1
, Week03.Solution2
, Week03.Vesting
build-depends: aeson
, base ^>=4.14.1.0

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
module Week03.Solution1 where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract
import qualified PlutusTx
import PlutusTx.Prelude hiding (unless)
import Ledger hiding (singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Ada as Ada
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Show (..), String)
import qualified Prelude as P
import Text.Printf (printf)
data VestingDatum = VestingDatum
{ beneficiary1 :: PubKeyHash
, beneficiary2 :: PubKeyHash
, deadline :: POSIXTime
} deriving Show
PlutusTx.unstableMakeIsData ''VestingDatum
{-# INLINABLE mkValidator #-}
mkValidator :: VestingDatum -> () -> ScriptContext -> Bool
mkValidator dat () ctx
| (beneficiary1 dat `elem` sigs) && (to (deadline dat) `contains` range) = True
| (beneficiary2 dat `elem` sigs) && (from (1 + deadline dat) `contains` range) = True
| otherwise = False
where
info :: TxInfo
info = scriptContextTxInfo ctx
sigs :: [PubKeyHash]
sigs = txInfoSignatories info
range :: POSIXTimeRange
range = txInfoValidRange info
data Vesting
instance Scripts.ValidatorTypes Vesting where
type instance DatumType Vesting = VestingDatum
type instance RedeemerType Vesting = ()
typedValidator :: Scripts.TypedValidator Vesting
typedValidator = Scripts.mkTypedValidator @Vesting
$$(PlutusTx.compile [|| mkValidator ||])
$$(PlutusTx.compile [|| wrap ||])
where
wrap = Scripts.wrapValidator @VestingDatum @()
validator :: Validator
validator = Scripts.validatorScript typedValidator
scrAddress :: Ledger.Address
scrAddress = scriptAddress validator
data GiveParams = GiveParams
{ gpBeneficiary :: !PubKeyHash
, gpDeadline :: !POSIXTime
, gpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type VestingSchema =
Endpoint "give" GiveParams
.\/ Endpoint "grab" ()
give :: AsContractError e => GiveParams -> Contract w s e ()
give gp = do
pkh <- pubKeyHash <$> ownPubKey
let dat = VestingDatum
{ beneficiary1 = gpBeneficiary gp
, beneficiary2 = pkh
, deadline = gpDeadline gp
}
tx = mustPayToTheScript dat $ Ada.lovelaceValueOf $ gpAmount gp
ledgerTx <- submitTxConstraints typedValidator tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ printf "made a gift of %d lovelace to %s with deadline %s"
(gpAmount gp)
(show $ gpBeneficiary gp)
(show $ gpDeadline gp)
grab :: forall w s e. AsContractError e => Contract w s e ()
grab = do
now <- currentTime
pkh <- pubKeyHash <$> ownPubKey
utxos <- utxoAt scrAddress
let utxos1 = Map.filter (isSuitable $ \dat -> beneficiary1 dat == pkh && now <= deadline dat) utxos
utxos2 = Map.filter (isSuitable $ \dat -> beneficiary2 dat == pkh && now > deadline dat) utxos
logInfo @String $ printf "found %d gift(s) to grab" (Map.size utxos1 P.+ Map.size utxos2)
unless (Map.null utxos1) $ do
let orefs = fst <$> Map.toList utxos1
lookups = Constraints.unspentOutputs utxos1 P.<>
Constraints.otherScript validator
tx :: TxConstraints Void Void
tx = mconcat [mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toData () | oref <- orefs] P.<>
mustValidateIn (to now)
void $ submitTxConstraintsWith @Void lookups tx
unless (Map.null utxos2) $ do
let orefs = fst <$> Map.toList utxos2
lookups = Constraints.unspentOutputs utxos2 P.<>
Constraints.otherScript validator
tx :: TxConstraints Void Void
tx = mconcat [mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toData () | oref <- orefs] P.<>
mustValidateIn (from now)
void $ submitTxConstraintsWith @Void lookups tx
where
isSuitable :: (VestingDatum -> Bool) -> TxOutTx -> Bool
isSuitable p o = case txOutDatumHash $ txOutTxOut o of
Nothing -> False
Just h -> case Map.lookup h $ txData $ txOutTxTx o of
Nothing -> False
Just (Datum e) -> maybe False p $ PlutusTx.fromData e
endpoints :: Contract () VestingSchema Text ()
endpoints = (give' `select` grab') >> endpoints
where
give' = endpoint @"give" >>= give
grab' = endpoint @"grab" >> grab
mkSchemaDefinitions ''VestingSchema
mkKnownCurrencies []

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
module Week03.Solution2 where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Ada as Ada
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
{-# INLINABLE mkValidator #-}
mkValidator :: PubKeyHash -> POSIXTime -> () -> ScriptContext -> Bool
mkValidator pkh s () ctx =
traceIfFalse "beneficiary's signature missing" checkSig &&
traceIfFalse "deadline not reached" checkDeadline
where
info :: TxInfo
info = scriptContextTxInfo ctx
checkSig :: Bool
checkSig = pkh `elem` txInfoSignatories info
checkDeadline :: Bool
checkDeadline = from s `contains` txInfoValidRange info
data Vesting
instance Scripts.ValidatorTypes Vesting where
type instance DatumType Vesting = POSIXTime
type instance RedeemerType Vesting = ()
typedValidator :: PubKeyHash -> Scripts.TypedValidator Vesting
typedValidator p = Scripts.mkTypedValidator @Vesting
($$(PlutusTx.compile [|| mkValidator ||]) `PlutusTx.applyCode` PlutusTx.liftCode p)
$$(PlutusTx.compile [|| wrap ||])
where
wrap = Scripts.wrapValidator @POSIXTime @()
validator :: PubKeyHash -> Validator
validator = Scripts.validatorScript . typedValidator
scrAddress :: PubKeyHash -> Ledger.Address
scrAddress = scriptAddress . validator
data GiveParams = GiveParams
{ gpBeneficiary :: !PubKeyHash
, gpDeadline :: !POSIXTime
, gpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type VestingSchema =
Endpoint "give" GiveParams
.\/ Endpoint "grab" ()
give :: AsContractError e => GiveParams -> Contract w s e ()
give gp = do
let p = gpBeneficiary gp
d = gpDeadline gp
tx = mustPayToTheScript d $ Ada.lovelaceValueOf $ gpAmount gp
ledgerTx <- submitTxConstraints (typedValidator p) tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ printf "made a gift of %d lovelace to %s with deadline %s"
(gpAmount gp)
(show $ gpBeneficiary gp)
(show $ gpDeadline gp)
grab :: forall w s e. AsContractError e => Contract w s e ()
grab = do
now <- currentTime
pkh <- pubKeyHash <$> ownPubKey
utxos <- Map.filter (isSuitable now) <$> utxoAt (scrAddress pkh)
if Map.null utxos
then logInfo @String $ "no gifts available"
else do
let orefs = fst <$> Map.toList utxos
lookups = Constraints.unspentOutputs utxos <>
Constraints.otherScript (validator pkh)
tx :: TxConstraints Void Void
tx = mconcat [mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toData () | oref <- orefs] <>
mustValidateIn (from now)
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "collected gifts"
where
isSuitable :: POSIXTime -> TxOutTx -> Bool
isSuitable now o = case txOutDatumHash $ txOutTxOut o of
Nothing -> False
Just h -> case Map.lookup h $ txData $ txOutTxTx o of
Nothing -> False
Just (Datum e) -> case PlutusTx.fromData e of
Nothing -> False
Just d -> d <= now
endpoints :: Contract () VestingSchema Text ()
endpoints = (give' `select` grab') >> endpoints
where
give' = endpoint @"give" >>= give
grab' = endpoint @"grab" >> grab
mkSchemaDefinitions ''VestingSchema
mkKnownCurrencies []

1
code/week04/plutus-pioneer-program-week04.cabal
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@ -15,6 +15,7 @@ library
, Week04.Homework
, Week04.Maybe
, Week04.Monad
, Week04.Solution
, Week04.Trace
, Week04.Writer
other-modules: Week04.Vesting

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeOperators #-}
module Week04.Solution where
import Data.Aeson (FromJSON, ToJSON)
import Data.Functor (void)
import Data.Text (Text, unpack)
import GHC.Generics (Generic)
import Ledger
import Ledger.Ada as Ada
import Ledger.Constraints as Constraints
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import Wallet.Emulator.Wallet
data PayParams = PayParams
{ ppRecipient :: PubKeyHash
, ppLovelace :: Integer
} deriving (Show, Generic, FromJSON, ToJSON)
type PaySchema = Endpoint "pay" PayParams
payContract :: Contract () PaySchema Text ()
payContract = do
pp <- endpoint @"pay"
let tx = mustPayToPubKey (ppRecipient pp) $ lovelaceValueOf $ ppLovelace pp
handleError (\err -> Contract.logInfo $ "caught error: " ++ unpack err) $ void $ submitTx tx
payContract
payTrace :: Integer -> Integer -> EmulatorTrace ()
payTrace x y = do
h <- activateContractWallet (Wallet 1) payContract
let pkh = pubKeyHash $ walletPubKey $ Wallet 2
callEndpoint @"pay" h $ PayParams
{ ppRecipient = pkh
, ppLovelace = x
}
void $ Emulator.waitNSlots 1
callEndpoint @"pay" h $ PayParams
{ ppRecipient = pkh
, ppLovelace = y
}
void $ Emulator.waitNSlots 1
payTest1 :: IO ()
payTest1 = runEmulatorTraceIO $ payTrace 1000000 2000000
payTest2 :: IO ()
payTest2 = runEmulatorTraceIO $ payTrace 1000000000 2000000

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@ -0,0 +1,23 @@
{
"name": "Plutus Starter Project",
"image": "plutus-devcontainer:latest",
"remoteUser": "plutus",
"mounts": [
// This shares cabal's remote repository state with the host. We don't mount the whole of '.cabal', because
// 1. '.cabal/config' contains absolute paths that will only make sense on the host, and
// 2. '.cabal/store' is not necessarily portable to different version of cabal etc.
"source=${localEnv:HOME}/.cabal/packages,target=/home/plutus/.cabal/packages,type=bind,consistency=cached",
],
"settings": {
// Note: don't change from bash so it runs .bashrc
"terminal.integrated.shell.linux": "/bin/bash"
},
// IDs of extensions inside container
"extensions": [
"haskell.haskell"
],
}

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@ -0,0 +1 @@
dist-newstyle/

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@ -0,0 +1,201 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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index-state: 2021-07-07T00:00:00Z
packages: ./.
-- You never, ever, want this.
write-ghc-environment-files: never
-- Always build tests and benchmarks.
tests: true
benchmarks: true
source-repository-package
type: git
location: https://github.com/input-output-hk/plutus.git
subdir:
freer-extras
playground-common
plutus-chain-index
plutus-core
plutus-contract
plutus-ledger
plutus-ledger-api
plutus-tx
plutus-tx-plugin
prettyprinter-configurable
quickcheck-dynamic
word-array
tag: 8f1a47674a99ac9bc2aba3231375d8d6de0641d2
-- The following sections are copied from the 'plutus' repository cabal.project at the revision
-- given above.
-- This is necessary because the 'plutus' libraries depend on a number of other libraries which are
-- not on Hackage, and so need to be pulled in as `source-repository-package`s themselves. Make sure to
-- re-update this section from the template when you do an upgrade.
-- This is also needed so evenful-sql-common will build with a
-- newer version of persistent. See stack.yaml for the mirrored
-- configuration.
package eventful-sql-common
ghc-options: -XDerivingStrategies -XStandaloneDeriving -XUndecidableInstances -XDataKinds -XFlexibleInstances -XMultiParamTypeClasses
allow-newer:
-- Pins to an old version of Template Haskell, unclear if/when it will be updated
size-based:template-haskell
-- The following two dependencies are needed by plutus.
, eventful-sql-common:persistent
, eventful-sql-common:persistent-template
, ouroboros-consensus-byron:formatting
, beam-core:aeson
, beam-sqlite:aeson
, beam-sqlite:dlist
, beam-migrate:aeson
constraints:
-- big breaking change here, inline-r doens't have an upper bound
singletons < 3.0
-- breaks eventful even more than it already was
, persistent-template < 2.12
-- bizarre issue: in earlier versions they define their own 'GEq', in newer
-- ones they reuse the one from 'some', but there isn't e.g. a proper version
-- constraint from dependent-sum-template (which is the library we actually use).
, dependent-sum > 0.6.2.0
-- See the note on nix/pkgs/default.nix:agdaPackages for why this is here.
-- (NOTE this will change to ieee754 in newer versions of nixpkgs).
extra-packages: ieee, filemanip
-- Drops an instance breaking our code. Should be released to Hackage eventually.
source-repository-package
type: git
location: https://github.com/Quid2/flat.git
tag: 95e5d7488451e43062ca84d5376b3adcc465f1cd
-- Needs some patches, but upstream seems to be fairly dead (no activity in > 1 year)
source-repository-package
type: git
location: https://github.com/shmish111/purescript-bridge.git
tag: 6a92d7853ea514be8b70bab5e72077bf5a510596
source-repository-package
type: git
location: https://github.com/shmish111/servant-purescript.git
tag: a76104490499aa72d40c2790d10e9383e0dbde63
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-crypto.git
tag: ce8f1934e4b6252084710975bd9bbc0a4648ece4
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-base
tag: a715c7f420770b70bbe95ca51d3dec83866cb1bd
subdir:
binary
binary/test
slotting
cardano-crypto-class
cardano-crypto-praos
cardano-crypto-tests
strict-containers
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-prelude
tag: fd773f7a58412131512b9f694ab95653ac430852
subdir:
cardano-prelude
cardano-prelude-test
source-repository-package
type: git
location: https://github.com/input-output-hk/ouroboros-network
tag: e338f2cf8e1078fbda9555dd2b169c6737ef6774
subdir:
monoidal-synchronisation
typed-protocols
typed-protocols-examples
ouroboros-network
ouroboros-network-testing
ouroboros-network-framework
ouroboros-consensus
ouroboros-consensus-byron
ouroboros-consensus-cardano
ouroboros-consensus-shelley
io-sim
io-classes
network-mux
source-repository-package
type: git
location: https://github.com/input-output-hk/iohk-monitoring-framework
tag: 34abfb7f4f5610cabb45396e0496472446a0b2ca
subdir:
iohk-monitoring
tracer-transformers
contra-tracer
plugins/backend-aggregation
plugins/backend-ekg
plugins/backend-monitoring
plugins/backend-trace-forwarder
plugins/scribe-systemd
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-ledger-specs
tag: 6b0fca7a73c317f3af7c14dd4dc38178cc78a6c8
subdir:
byron/chain/executable-spec
byron/crypto
byron/crypto/test
byron/ledger/executable-spec
byron/ledger/impl
byron/ledger/impl/test
semantics/executable-spec
semantics/small-steps-test
shelley/chain-and-ledger/dependencies/non-integer
shelley/chain-and-ledger/executable-spec
shelley/chain-and-ledger/shelley-spec-ledger-test
shelley-ma/impl
cardano-ledger-core
alonzo/impl
-- A lot of plutus dependencies have to be synchronized with the dependencies of
-- cardano-node. If you update cardano-node, please make sure that all dependencies
-- of cardano-node are also updated.
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-node.git
tag: f3ef4ed72894499160f2330b91572a159005c148
subdir:
cardano-api
cardano-node
cardano-cli
cardano-config
source-repository-package
type: git
location: https://github.com/input-output-hk/Win32-network
tag: 94153b676617f8f33abe8d8182c37377d2784bd1
source-repository-package
type: git
location: https://github.com/input-output-hk/hedgehog-extras
tag: 8bcd3c9dc22cc44f9fcfe161f4638a384fc7a187
-- The following dependencies are not mirrored in the
-- stack.yaml file, but they are needed regardless by cabal.
source-repository-package
type: git
location: https://github.com/input-output-hk/goblins
tag: cde90a2b27f79187ca8310b6549331e59595e7ba

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cradle:
cabal:
- path: "./src"
component: "lib:plutus-pioneer-program-week05"

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Cabal-Version: 2.4
Name: plutus-pioneer-program-week05
Version: 0.1.0.0
Author: Lars Bruenjes
Maintainer: brunjlar@gmail.com
Build-Type: Simple
Copyright: © 2021 Lars Bruenjes
License: Apache-2.0
License-files: LICENSE
library
hs-source-dirs: src
exposed-modules: Week05.Free
, Week05.Homework1
, Week05.Homework2
, Week05.NFT
, Week05.Signed
, Week05.Solution1
, Week05.Solution2
build-depends: aeson
, base ^>=4.14.1.0
, containers
, data-default
, freer-extras
, playground-common
, plutus-contract
, plutus-ledger
, plutus-ledger-api
, plutus-tx-plugin
, plutus-tx
, text
default-language: Haskell2010
ghc-options: -Wall -fobject-code -fno-ignore-interface-pragmas -fno-omit-interface-pragmas -fno-strictness -fno-spec-constr -fno-specialise

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Free where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: () -> ScriptContext -> Bool
mkPolicy () _ = True
policy :: Scripts.MintingPolicy
policy = mkMintingPolicyScript $$(PlutusTx.compile [|| Scripts.wrapMintingPolicy mkPolicy ||])
curSymbol :: CurrencySymbol
curSymbol = scriptCurrencySymbol policy
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type FreeSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w FreeSchema Text ()
mint mp = do
let val = Value.singleton curSymbol (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy policy
tx = Constraints.mustMintValue val
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () FreeSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''FreeSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = 555
}
callEndpoint @"mint" h2 $ MintParams
{ mpTokenName = tn
, mpAmount = 444
}
void $ Emulator.waitNSlots 1
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = -222
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Homework1 where
import Control.Monad hiding (fmap)
import Control.Monad.Freer.Extras as Extras
import Data.Aeson (ToJSON, FromJSON)
import Data.Default (Default (..))
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import Ledger.TimeSlot
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String, undefined)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
-- This policy should only allow minting (or burning) of tokens if the owner of the specified PubKeyHash
-- has signed the transaction and if the specified deadline has not passed.
mkPolicy :: PubKeyHash -> POSIXTime -> () -> ScriptContext -> Bool
mkPolicy pkh deadline () ctx = True -- FIX ME!
policy :: PubKeyHash -> POSIXTime -> Scripts.MintingPolicy
policy pkh deadline = undefined -- IMPLEMENT ME!
curSymbol :: PubKeyHash -> POSIXTime -> CurrencySymbol
curSymbol pkh deadline = undefined -- IMPLEMENT ME!
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpDeadline :: !POSIXTime
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type SignedSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w SignedSchema Text ()
mint mp = do
pkh <- pubKeyHash <$> Contract.ownPubKey
now <- Contract.currentTime
let deadline = mpDeadline mp
if now > deadline
then Contract.logError @String "deadline passed"
else do
let val = Value.singleton (curSymbol pkh deadline) (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy $ policy pkh deadline
tx = Constraints.mustMintValue val <> Constraints.mustValidateIn (to $ now + 5000)
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () SignedSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''SignedSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
deadline = slotToBeginPOSIXTime def 10
h <- activateContractWallet (Wallet 1) endpoints
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 15
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Homework2 where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String, undefined)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
-- Minting policy for an NFT, where the minting transaction must consume the given UTxO as input
-- and where the TokenName will be the empty ByteString.
mkPolicy :: TxOutRef -> () -> ScriptContext -> Bool
mkPolicy oref () ctx = True -- FIX ME!
policy :: TxOutRef -> Scripts.MintingPolicy
policy oref = undefined -- IMPLEMENT ME!
curSymbol :: TxOutRef -> CurrencySymbol
curSymbol = undefined -- IMPLEMENT ME!
type NFTSchema = Endpoint "mint" ()
mint :: Contract w NFTSchema Text ()
mint = undefined -- IMPLEMENT ME!
endpoints :: Contract () NFTSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >> mint
mkSchemaDefinitions ''NFTSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 ()
callEndpoint @"mint" h2 ()
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.NFT where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: TxOutRef -> TokenName -> () -> ScriptContext -> Bool
mkPolicy oref tn () ctx = traceIfFalse "UTxO not consumed" hasUTxO &&
traceIfFalse "wrong amount minted" checkMintedAmount
where
info :: TxInfo
info = scriptContextTxInfo ctx
hasUTxO :: Bool
hasUTxO = any (\i -> txInInfoOutRef i == oref) $ txInfoInputs info
checkMintedAmount :: Bool
checkMintedAmount = case flattenValue (txInfoForge info) of
[(cs, tn', amt)] -> cs == ownCurrencySymbol ctx && tn' == tn && amt == 1
_ -> False
policy :: TxOutRef -> TokenName -> Scripts.MintingPolicy
policy oref tn = mkMintingPolicyScript $
$$(PlutusTx.compile [|| \oref' tn' -> Scripts.wrapMintingPolicy $ mkPolicy oref' tn' ||])
`PlutusTx.applyCode`
PlutusTx.liftCode oref
`PlutusTx.applyCode`
PlutusTx.liftCode tn
curSymbol :: TxOutRef -> TokenName -> CurrencySymbol
curSymbol oref tn = scriptCurrencySymbol $ policy oref tn
type NFTSchema = Endpoint "mint" TokenName
mint :: TokenName -> Contract w NFTSchema Text ()
mint tn = do
pk <- Contract.ownPubKey
utxos <- utxoAt (pubKeyAddress pk)
case Map.keys utxos of
[] -> Contract.logError @String "no utxo found"
oref : _ -> do
let val = Value.singleton (curSymbol oref tn) tn 1
lookups = Constraints.mintingPolicy (policy oref tn) <> Constraints.unspentOutputs utxos
tx = Constraints.mustMintValue val <> Constraints.mustSpendPubKeyOutput oref
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () NFTSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''NFTSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 tn
callEndpoint @"mint" h2 tn
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Signed where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: PubKeyHash -> () -> ScriptContext -> Bool
mkPolicy pkh () ctx = txSignedBy (scriptContextTxInfo ctx) pkh
policy :: PubKeyHash -> Scripts.MintingPolicy
policy pkh = mkMintingPolicyScript $
$$(PlutusTx.compile [|| Scripts.wrapMintingPolicy . mkPolicy ||])
`PlutusTx.applyCode`
(PlutusTx.liftCode pkh)
curSymbol :: PubKeyHash -> CurrencySymbol
curSymbol = scriptCurrencySymbol . policy
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type SignedSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w SignedSchema Text ()
mint mp = do
pkh <- pubKeyHash <$> Contract.ownPubKey
let val = Value.singleton (curSymbol pkh) (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy $ policy pkh
tx = Constraints.mustMintValue val
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () SignedSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''SignedSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = 555
}
callEndpoint @"mint" h2 $ MintParams
{ mpTokenName = tn
, mpAmount = 444
}
void $ Emulator.waitNSlots 1
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = -222
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Solution1 where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Default (Default (..))
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import Ledger.TimeSlot
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: PubKeyHash -> POSIXTime -> () -> ScriptContext -> Bool
mkPolicy pkh deadline () ctx =
traceIfFalse "signature missing" (txSignedBy info pkh) &&
traceIfFalse "deadline missed" (to deadline `contains` txInfoValidRange info)
where
info = scriptContextTxInfo ctx
policy :: PubKeyHash -> POSIXTime -> Scripts.MintingPolicy
policy pkh deadline = mkMintingPolicyScript $
$$(PlutusTx.compile [|| \pkh' deadline' -> Scripts.wrapMintingPolicy $ mkPolicy pkh' deadline' ||])
`PlutusTx.applyCode`
PlutusTx.liftCode pkh
`PlutusTx.applyCode`
PlutusTx.liftCode deadline
curSymbol :: PubKeyHash -> POSIXTime -> CurrencySymbol
curSymbol pkh deadline = scriptCurrencySymbol $ policy pkh deadline
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpDeadline :: !POSIXTime
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type SignedSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w SignedSchema Text ()
mint mp = do
pkh <- pubKeyHash <$> Contract.ownPubKey
now <- Contract.currentTime
let deadline = mpDeadline mp
if now > deadline
then Contract.logError @String "deadline passed"
else do
let val = Value.singleton (curSymbol pkh deadline) (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy $ policy pkh deadline
tx = Constraints.mustMintValue val <> Constraints.mustValidateIn (to $ now + 5000)
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () SignedSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''SignedSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
deadline = slotToBeginPOSIXTime def 10
h <- activateContractWallet (Wallet 1) endpoints
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 15
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Solution2 where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE tn #-}
tn :: TokenName
tn = TokenName emptyByteString
{-# INLINABLE mkPolicy #-}
mkPolicy :: TxOutRef -> () -> ScriptContext -> Bool
mkPolicy oref () ctx = traceIfFalse "UTxO not consumed" hasUTxO &&
traceIfFalse "wrong amount minted" checkMintedAmount
where
info :: TxInfo
info = scriptContextTxInfo ctx
hasUTxO :: Bool
hasUTxO = any (\i -> txInInfoOutRef i == oref) $ txInfoInputs info
checkMintedAmount :: Bool
checkMintedAmount = case flattenValue (txInfoForge info) of
[(cs, tn', amt)] -> cs == ownCurrencySymbol ctx && tn' == tn && amt == 1
_ -> False
policy :: TxOutRef -> Scripts.MintingPolicy
policy oref = mkMintingPolicyScript $
$$(PlutusTx.compile [|| Scripts.wrapMintingPolicy . mkPolicy ||])
`PlutusTx.applyCode`
PlutusTx.liftCode oref
curSymbol :: TxOutRef -> CurrencySymbol
curSymbol = scriptCurrencySymbol . policy
type NFTSchema = Endpoint "mint" ()
mint :: Contract w NFTSchema Text ()
mint = do
pk <- Contract.ownPubKey
utxos <- utxoAt (pubKeyAddress pk)
case Map.keys utxos of
[] -> Contract.logError @String "no utxo found"
oref : _ -> do
let val = Value.singleton (curSymbol oref) tn 1
lookups = Constraints.mintingPolicy (policy oref) <> Constraints.unspentOutputs utxos
tx = Constraints.mustMintValue val <> Constraints.mustSpendPubKeyOutput oref
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () NFTSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >> mint
mkSchemaDefinitions ''NFTSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 ()
callEndpoint @"mint" h2 ()
void $ Emulator.waitNSlots 1

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{
"name": "Plutus Starter Project",
"image": "plutus-devcontainer:latest",
"remoteUser": "plutus",
"mounts": [
// This shares cabal's remote repository state with the host. We don't mount the whole of '.cabal', because
// 1. '.cabal/config' contains absolute paths that will only make sense on the host, and
// 2. '.cabal/store' is not necessarily portable to different version of cabal etc.
"source=${localEnv:HOME}/.cabal/packages,target=/home/plutus/.cabal/packages,type=bind,consistency=cached",
],
"settings": {
// Note: don't change from bash so it runs .bashrc
"terminal.integrated.shell.linux": "/bin/bash"
},
// IDs of extensions inside container
"extensions": [
"haskell.haskell"
],
}

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dist-newstyle/
oracle.cid
W2.cid
W3.cid
W4.cid
W5.cid

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59
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{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedStrings #-}
module Main
( main
) where
import Control.Concurrent
import Control.Monad (when)
import Control.Monad.IO.Class (MonadIO (..))
import Data.ByteString (ByteString)
import Data.ByteString.Char8 (unpack)
import Data.Proxy (Proxy (..))
import Data.Text (pack)
import Data.UUID
import Network.HTTP.Req
import Text.Regex.TDFA
main :: IO ()
main = do
uuid <- read <$> readFile "oracle.cid"
putStrLn $ "oracle contract instance id: " ++ show uuid
go uuid Nothing
where
go :: UUID -> Maybe Integer -> IO a
go uuid m = do
x <- getExchangeRate
let y = Just x
when (m /= y) $
updateOracle uuid x
threadDelay 5_000_000
go uuid y
updateOracle :: UUID -> Integer -> IO ()
updateOracle uuid x = runReq defaultHttpConfig $ do
v <- req
POST
(http "127.0.0.1" /: "api" /: "new" /: "contract" /: "instance" /: pack (show uuid) /: "endpoint" /: "update")
(ReqBodyJson x)
(Proxy :: Proxy (JsonResponse ()))
(port 8080)
liftIO $ putStrLn $ if responseStatusCode v == 200
then "updated oracle to " ++ show x
else "error updating oracle"
getExchangeRate :: IO Integer
getExchangeRate = runReq defaultHttpConfig $ do
v <- req
GET
(https "coinmarketcap.com" /: "currencies" /: "cardano")
NoReqBody
bsResponse
mempty
let priceRegex = "priceValue___11gHJ \">\\$([\\.0-9]*)" :: ByteString
(_, _, _, [bs]) = responseBody v =~ priceRegex :: (ByteString, ByteString, ByteString, [ByteString])
d = read $ unpack bs :: Double
x = round $ 1_000_000 * d
liftIO $ putStrLn $ "queried exchange rate: " ++ show d
return x

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Main
( main
) where
import Control.Monad (forM_, void, when)
import Control.Monad.Freer (Eff, Member, interpret, type (~>))
import Control.Monad.Freer.Error (Error)
import Control.Monad.Freer.Extras.Log (LogMsg)
import Control.Monad.IO.Class (MonadIO (..))
import Data.Aeson (FromJSON, Result (..), fromJSON)
import Data.Default (Default (..))
import Data.Monoid (Last (..))
import Data.Text (Text, pack)
import Ledger
import Ledger.Constraints
import qualified Ledger.Value as Value
import Plutus.Contract
import Plutus.PAB.Effects.Contract (ContractEffect (..))
import Plutus.PAB.Effects.Contract.Builtin (Builtin, SomeBuiltin (..), endpointsToSchemas, handleBuiltin)
import Plutus.PAB.Monitoring.PABLogMsg (PABMultiAgentMsg)
import Plutus.PAB.Simulator (SimulatorEffectHandlers)
import qualified Plutus.PAB.Simulator as Simulator
import Plutus.PAB.Types (PABError (..))
import qualified Plutus.PAB.Webserver.Server as PAB.Server
import qualified Plutus.Contracts.Currency as Currency
import Wallet.Emulator.Types (Wallet (..), walletPubKey)
import Wallet.Types (ContractInstanceId (..))
import qualified Week06.Oracle.Core as Oracle
import Week06.Oracle.PAB (OracleContracts (..))
import qualified Week06.Oracle.Swap as Oracle
main :: IO ()
main = void $ Simulator.runSimulationWith handlers $ do
Simulator.logString @(Builtin OracleContracts) "Starting Oracle PAB webserver. Press enter to exit."
shutdown <- PAB.Server.startServerDebug
cidInit <- Simulator.activateContract (Wallet 1) Init
cs <- waitForLast cidInit
_ <- Simulator.waitUntilFinished cidInit
cidOracle <- Simulator.activateContract (Wallet 1) $ Oracle cs
liftIO $ writeFile "oracle.cid" $ show $ unContractInstanceId cidOracle
oracle <- waitForLast cidOracle
forM_ wallets $ \w ->
when (w /= Wallet 1) $ do
cid <- Simulator.activateContract w $ Swap oracle
liftIO $ writeFile ('W' : show (getWallet w) ++ ".cid") $ show $ unContractInstanceId cid
void $ liftIO getLine
shutdown
waitForLast :: FromJSON a => ContractInstanceId -> Simulator.Simulation t a
waitForLast cid =
flip Simulator.waitForState cid $ \json -> case fromJSON json of
Success (Last (Just x)) -> Just x
_ -> Nothing
wallets :: [Wallet]
wallets = [Wallet i | i <- [1 .. 5]]
usdt :: TokenName
usdt = "USDT"
oracleParams :: CurrencySymbol -> Oracle.OracleParams
oracleParams cs = Oracle.OracleParams
{ Oracle.opFees = 1_000_000
, Oracle.opSymbol = cs
, Oracle.opToken = usdt
}
handleOracleContracts ::
( Member (Error PABError) effs
, Member (LogMsg (PABMultiAgentMsg (Builtin OracleContracts))) effs
)
=> ContractEffect (Builtin OracleContracts)
~> Eff effs
handleOracleContracts = handleBuiltin getSchema getContract where
getSchema = \case
Init -> endpointsToSchemas @Empty
Oracle _ -> endpointsToSchemas @Oracle.OracleSchema
Swap _ -> endpointsToSchemas @Oracle.SwapSchema
getContract = \case
Init -> SomeBuiltin initContract
Oracle cs -> SomeBuiltin $ Oracle.runOracle $ oracleParams cs
Swap oracle -> SomeBuiltin $ Oracle.swap oracle
handlers :: SimulatorEffectHandlers (Builtin OracleContracts)
handlers =
Simulator.mkSimulatorHandlers @(Builtin OracleContracts) def []
$ interpret handleOracleContracts
initContract :: Contract (Last CurrencySymbol) Empty Text ()
initContract = do
ownPK <- pubKeyHash <$> ownPubKey
cur <-
mapError (pack . show)
(Currency.mintContract ownPK [(usdt, fromIntegral (length wallets) * amount)]
:: Contract (Last CurrencySymbol) Empty Currency.CurrencyError Currency.OneShotCurrency)
let cs = Currency.currencySymbol cur
v = Value.singleton cs usdt amount
forM_ wallets $ \w -> do
let pkh = pubKeyHash $ walletPubKey w
when (pkh /= ownPK) $ do
tx <- submitTx $ mustPayToPubKey pkh v
awaitTxConfirmed $ txId tx
tell $ Last $ Just cs
where
amount :: Integer
amount = 100_000_000

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{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Main
( main
) where
import Control.Concurrent
import Control.Exception
import Control.Monad.IO.Class (MonadIO (..))
import Data.Aeson (Result (..), fromJSON)
import Data.Monoid (Last (..))
import Data.Proxy (Proxy (..))
import Data.Text (pack)
import Data.UUID
import Ledger.Value (flattenValue)
import Network.HTTP.Req
import Plutus.PAB.Events.ContractInstanceState (PartiallyDecodedResponse (..))
import Plutus.PAB.Webserver.Types
import System.Environment (getArgs)
import System.IO
import Text.Read (readMaybe)
import Week06.Oracle.PAB (OracleContracts)
main :: IO ()
main = do
[i :: Int] <- map read <$> getArgs
uuid <- read <$> readFile ('W' : show i ++ ".cid")
hSetBuffering stdout NoBuffering
putStrLn $ "swap contract instance id for Wallet " ++ show i ++ ": " ++ show uuid
go uuid
where
go :: UUID -> IO a
go uuid = do
cmd <- readCommand
case cmd of
Offer amt -> offer uuid amt
Retrieve -> retrieve uuid
Use -> use uuid
Funds -> getFunds uuid
go uuid
readCommand :: IO Command
readCommand = do
putStr "enter command (Offer amt, Retrieve, Use or Funds): "
s <- getLine
maybe readCommand return $ readMaybe s
data Command = Offer Integer | Retrieve | Use | Funds
deriving (Show, Read, Eq, Ord)
getFunds :: UUID -> IO ()
getFunds uuid = handle h $ runReq defaultHttpConfig $ do
v <- req
POST
(http "127.0.0.1" /: "api" /: "new" /: "contract" /: "instance" /: pack (show uuid) /: "endpoint" /: "funds")
(ReqBodyJson ())
(Proxy :: Proxy (JsonResponse ()))
(port 8080)
if responseStatusCode v /= 200
then liftIO $ putStrLn "error getting funds"
else do
w <- req
GET
(http "127.0.0.1" /: "api" /: "new" /: "contract" /: "instance" /: pack (show uuid) /: "status")
NoReqBody
(Proxy :: Proxy (JsonResponse (ContractInstanceClientState OracleContracts)))
(port 8080)
liftIO $ putStrLn $ case fromJSON $ observableState $ cicCurrentState $ responseBody w of
Success (Last (Just f)) -> "funds: " ++ show (flattenValue f)
_ -> "error decoding state"
where
h :: HttpException -> IO ()
h _ = threadDelay 1_000_000 >> getFunds uuid
offer :: UUID -> Integer -> IO ()
offer uuid amt = handle h $ runReq defaultHttpConfig $ do
v <- req
POST
(http "127.0.0.1" /: "api" /: "new" /: "contract" /: "instance" /: pack (show uuid) /: "endpoint" /: "offer")
(ReqBodyJson amt)
(Proxy :: Proxy (JsonResponse ()))
(port 8080)
liftIO $ putStrLn $ if responseStatusCode v == 200
then "offered swap of " ++ show amt ++ " lovelace"
else "error offering swap"
where
h :: HttpException -> IO ()
h _ = threadDelay 1_000_000 >> offer uuid amt
retrieve :: UUID -> IO ()
retrieve uuid = handle h $ runReq defaultHttpConfig $ do
v <- req
POST
(http "127.0.0.1" /: "api" /: "new" /: "contract" /: "instance" /: pack (show uuid) /: "endpoint" /: "retrieve")
(ReqBodyJson ())
(Proxy :: Proxy (JsonResponse ()))
(port 8080)
liftIO $ putStrLn $ if responseStatusCode v == 200
then "retrieved swaps"
else "error retrieving swaps"
where
h :: HttpException -> IO ()
h _ = threadDelay 1_000_000 >> retrieve uuid
use :: UUID -> IO ()
use uuid = handle h $ runReq defaultHttpConfig $ do
v <- req
POST
(http "127.0.0.1" /: "api" /: "new" /: "contract" /: "instance" /: pack (show uuid) /: "endpoint" /: "use")
(ReqBodyJson ())
(Proxy :: Proxy (JsonResponse ()))
(port 8080)
liftIO $ putStrLn $ if responseStatusCode v == 200
then "used swap"
else "error using swap"
where
h :: HttpException -> IO ()
h _ = threadDelay 1_000_000 >> use uuid

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index-state: 2021-07-07T00:00:00Z
packages: ./.
-- You never, ever, want this.
write-ghc-environment-files: never
-- Always build tests and benchmarks.
tests: true
benchmarks: true
source-repository-package
type: git
location: https://github.com/input-output-hk/plutus.git
subdir:
freer-extras
playground-common
plutus-chain-index
plutus-core
plutus-contract
plutus-ledger
plutus-ledger-api
plutus-pab
plutus-tx
plutus-tx-plugin
plutus-use-cases
prettyprinter-configurable
quickcheck-dynamic
word-array
tag: 8a20664f00d8f396920385947903761a9a897fe0
-- The following sections are copied from the 'plutus' repository cabal.project at the revision
-- given above.
-- This is necessary because the 'plutus' libraries depend on a number of other libraries which are
-- not on Hackage, and so need to be pulled in as `source-repository-package`s themselves. Make sure to
-- re-update this section from the template when you do an upgrade.
-- This is also needed so evenful-sql-common will build with a
-- newer version of persistent. See stack.yaml for the mirrored
-- configuration.
package eventful-sql-common
ghc-options: -XDerivingStrategies -XStandaloneDeriving -XUndecidableInstances -XDataKinds -XFlexibleInstances -XMultiParamTypeClasses
allow-newer:
-- Pins to an old version of Template Haskell, unclear if/when it will be updated
size-based:template-haskell
-- The following two dependencies are needed by plutus.
, eventful-sql-common:persistent
, eventful-sql-common:persistent-template
, ouroboros-consensus-byron:formatting
, beam-core:aeson
, beam-sqlite:aeson
, beam-sqlite:dlist
, beam-migrate:aeson
constraints:
-- big breaking change here, inline-r doens't have an upper bound
singletons < 3.0
-- breaks eventful even more than it already was
, persistent-template < 2.12
-- bizarre issue: in earlier versions they define their own 'GEq', in newer
-- ones they reuse the one from 'some', but there isn't e.g. a proper version
-- constraint from dependent-sum-template (which is the library we actually use).
, dependent-sum > 0.6.2.0
-- See the note on nix/pkgs/default.nix:agdaPackages for why this is here.
-- (NOTE this will change to ieee754 in newer versions of nixpkgs).
extra-packages: ieee, filemanip
-- Drops an instance breaking our code. Should be released to Hackage eventually.
source-repository-package
type: git
location: https://github.com/Quid2/flat.git
tag: 95e5d7488451e43062ca84d5376b3adcc465f1cd
-- Needs some patches, but upstream seems to be fairly dead (no activity in > 1 year)
source-repository-package
type: git
location: https://github.com/shmish111/purescript-bridge.git
tag: 6a92d7853ea514be8b70bab5e72077bf5a510596
source-repository-package
type: git
location: https://github.com/shmish111/servant-purescript.git
tag: a76104490499aa72d40c2790d10e9383e0dbde63
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-crypto.git
tag: ce8f1934e4b6252084710975bd9bbc0a4648ece4
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-base
tag: a715c7f420770b70bbe95ca51d3dec83866cb1bd
subdir:
binary
binary/test
slotting
cardano-crypto-class
cardano-crypto-praos
cardano-crypto-tests
strict-containers
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-prelude
tag: fd773f7a58412131512b9f694ab95653ac430852
subdir:
cardano-prelude
cardano-prelude-test
source-repository-package
type: git
location: https://github.com/input-output-hk/ouroboros-network
tag: e338f2cf8e1078fbda9555dd2b169c6737ef6774
subdir:
monoidal-synchronisation
typed-protocols
typed-protocols-examples
ouroboros-network
ouroboros-network-testing
ouroboros-network-framework
ouroboros-consensus
ouroboros-consensus-byron
ouroboros-consensus-cardano
ouroboros-consensus-shelley
io-sim
io-classes
network-mux
source-repository-package
type: git
location: https://github.com/input-output-hk/iohk-monitoring-framework
tag: 34abfb7f4f5610cabb45396e0496472446a0b2ca
subdir:
iohk-monitoring
tracer-transformers
contra-tracer
plugins/backend-aggregation
plugins/backend-ekg
plugins/backend-monitoring
plugins/backend-trace-forwarder
plugins/scribe-systemd
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-ledger-specs
tag: 6b0fca7a73c317f3af7c14dd4dc38178cc78a6c8
subdir:
byron/chain/executable-spec
byron/crypto
byron/crypto/test
byron/ledger/executable-spec
byron/ledger/impl
byron/ledger/impl/test
semantics/executable-spec
semantics/small-steps-test
shelley/chain-and-ledger/dependencies/non-integer
shelley/chain-and-ledger/executable-spec
shelley/chain-and-ledger/shelley-spec-ledger-test
shelley-ma/impl
cardano-ledger-core
alonzo/impl
-- A lot of plutus dependencies have to be synchronized with the dependencies of
-- cardano-node. If you update cardano-node, please make sure that all dependencies
-- of cardano-node are also updated.
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-node.git
tag: f3ef4ed72894499160f2330b91572a159005c148
subdir:
cardano-api
cardano-node
cardano-cli
cardano-config
source-repository-package
type: git
location: https://github.com/input-output-hk/Win32-network
tag: 94153b676617f8f33abe8d8182c37377d2784bd1
source-repository-package
type: git
location: https://github.com/input-output-hk/hedgehog-extras
tag: 8bcd3c9dc22cc44f9fcfe161f4638a384fc7a187
-- The following dependencies are not mirrored in the
-- stack.yaml file, but they are needed regardless by cabal.
source-repository-package
type: git
location: https://github.com/input-output-hk/goblins
tag: cde90a2b27f79187ca8310b6549331e59595e7ba

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cradle:
cabal:
- path: "./src"
component: "lib:plutus-pioneer-program-week06"
- path: "./app/oracle-pab.hs"
component: "exe:oracle-pab"
- path: "./app/oracle-client.hs"
component: "exe:oracle-client"
- path: "./app/swap-client.hs"
component: "exe:swap-client"

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Cabal-Version: 2.4
Name: plutus-pioneer-program-week06
Version: 0.1.0.0
Author: Lars Bruenjes
Maintainer: brunjlar@gmail.com
Build-Type: Simple
Copyright: © 2021 Lars Bruenjes
License: Apache-2.0
License-files: LICENSE
library
hs-source-dirs: src
exposed-modules: Week06.Oracle.Core
Week06.Oracle.Funds
Week06.Oracle.PAB
Week06.Oracle.Swap
Week06.Oracle.Test
build-depends: aeson
, base ^>=4.14.1.0
, containers
, data-default
, freer-extras
, playground-common
, plutus-contract
, plutus-ledger
, plutus-ledger-api
, plutus-tx-plugin
, plutus-tx
, plutus-use-cases
, prettyprinter
, text
default-language: Haskell2010
ghc-options: -Wall -fobject-code -fno-ignore-interface-pragmas -fno-omit-interface-pragmas -fno-strictness -fno-spec-constr -fno-specialise
executable oracle-pab
main-is: oracle-pab.hs
hs-source-dirs: app
ghc-options: -Wall -threaded
build-depends: aeson
, base ^>= 4.14.1.0
, data-default
, freer-extras
, freer-simple
, plutus-contract
, plutus-ledger
, plutus-pab
, plutus-pioneer-program-week06
, plutus-use-cases
, text
executable oracle-client
main-is: oracle-client.hs
hs-source-dirs: app
ghc-options: -Wall
build-depends: base ^>= 4.14.1.0
, bytestring
, regex-tdfa ^>= 1.3.1.0
, req ^>= 3.9.0
, text
, uuid
executable swap-client
main-is: swap-client.hs
hs-source-dirs: app
ghc-options: -Wall
build-depends: aeson
, base ^>= 4.14.1.0
, plutus-ledger
, plutus-pab
, plutus-pioneer-program-week06
, req ^>= 3.9.0
, text
, uuid

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week06.Oracle.Core
( Oracle (..)
, OracleRedeemer (..)
, oracleTokenName
, oracleValue
, oracleAsset
, typedOracleValidator
, oracleValidator
, oracleAddress
, OracleSchema
, OracleParams (..)
, runOracle
, findOracle
) where
import Control.Monad hiding (fmap)
import Data.Aeson (FromJSON, ToJSON)
import qualified Data.Map as Map
import Data.Monoid (Last (..))
import Data.Text (Text, pack)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Ledger.Ada as Ada
import Plutus.Contracts.Currency as Currency
import Prelude (Semigroup (..), Show (..), String)
import qualified Prelude
data Oracle = Oracle
{ oSymbol :: !CurrencySymbol
, oOperator :: !PubKeyHash
, oFee :: !Integer
, oAsset :: !AssetClass
} deriving (Show, Generic, FromJSON, ToJSON, Prelude.Eq, Prelude.Ord)
PlutusTx.makeLift ''Oracle
data OracleRedeemer = Update | Use
deriving Show
PlutusTx.unstableMakeIsData ''OracleRedeemer
{-# INLINABLE oracleTokenName #-}
oracleTokenName :: TokenName
oracleTokenName = TokenName emptyByteString
{-# INLINABLE oracleAsset #-}
oracleAsset :: Oracle -> AssetClass
oracleAsset oracle = AssetClass (oSymbol oracle, oracleTokenName)
{-# INLINABLE oracleValue #-}
oracleValue :: TxOut -> (DatumHash -> Maybe Datum) -> Maybe Integer
oracleValue o f = do
dh <- txOutDatum o
Datum d <- f dh
PlutusTx.fromBuiltinData d
{-# INLINABLE mkOracleValidator #-}
mkOracleValidator :: Oracle -> Integer -> OracleRedeemer -> ScriptContext -> Bool
mkOracleValidator oracle x r ctx =
traceIfFalse "token missing from input" inputHasToken &&
traceIfFalse "token missing from output" outputHasToken &&
case r of
Update -> traceIfFalse "operator signature missing" (txSignedBy info $ oOperator oracle) &&
traceIfFalse "invalid output datum" validOutputDatum
Use -> traceIfFalse "oracle value changed" (outputDatum == Just x) &&
traceIfFalse "fees not paid" feesPaid
where
info :: TxInfo
info = scriptContextTxInfo ctx
ownInput :: TxOut
ownInput = case findOwnInput ctx of
Nothing -> traceError "oracle input missing"
Just i -> txInInfoResolved i
inputHasToken :: Bool
inputHasToken = assetClassValueOf (txOutValue ownInput) (oracleAsset oracle) == 1
ownOutput :: TxOut
ownOutput = case getContinuingOutputs ctx of
[o] -> o
_ -> traceError "expected exactly one oracle output"
outputHasToken :: Bool
outputHasToken = assetClassValueOf (txOutValue ownOutput) (oracleAsset oracle) == 1
outputDatum :: Maybe Integer
outputDatum = oracleValue ownOutput (`findDatum` info)
validOutputDatum :: Bool
validOutputDatum = isJust outputDatum
feesPaid :: Bool
feesPaid =
let
inVal = txOutValue ownInput
outVal = txOutValue ownOutput
in
outVal `geq` (inVal <> Ada.lovelaceValueOf (oFee oracle))
data Oracling
instance Scripts.ValidatorTypes Oracling where
type instance DatumType Oracling = Integer
type instance RedeemerType Oracling = OracleRedeemer
typedOracleValidator :: Oracle -> Scripts.TypedValidator Oracling
typedOracleValidator oracle = Scripts.mkTypedValidator @Oracling
($$(PlutusTx.compile [|| mkOracleValidator ||]) `PlutusTx.applyCode` PlutusTx.liftCode oracle)
$$(PlutusTx.compile [|| wrap ||])
where
wrap = Scripts.wrapValidator @Integer @OracleRedeemer
oracleValidator :: Oracle -> Validator
oracleValidator = Scripts.validatorScript . typedOracleValidator
oracleAddress :: Oracle -> Ledger.Address
oracleAddress = scriptAddress . oracleValidator
data OracleParams = OracleParams
{ opFees :: !Integer
, opSymbol :: !CurrencySymbol
, opToken :: !TokenName
} deriving (Show, Generic, FromJSON, ToJSON)
startOracle :: forall w s. OracleParams -> Contract w s Text Oracle
startOracle op = do
pkh <- pubKeyHash <$> Contract.ownPubKey
osc <- mapError (pack . show) (mintContract pkh [(oracleTokenName, 1)] :: Contract w s CurrencyError OneShotCurrency)
let cs = Currency.currencySymbol osc
oracle = Oracle
{ oSymbol = cs
, oOperator = pkh
, oFee = opFees op
, oAsset = AssetClass (opSymbol op, opToken op)
}
logInfo @String $ "started oracle " ++ show oracle
return oracle
updateOracle :: forall w s. Oracle -> Integer -> Contract w s Text ()
updateOracle oracle x = do
m <- findOracle oracle
let c = Constraints.mustPayToTheScript x $ assetClassValue (oracleAsset oracle) 1
case m of
Nothing -> do
ledgerTx <- submitTxConstraints (typedOracleValidator oracle) c
awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "set initial oracle value to " ++ show x
Just (oref, o, _) -> do
let lookups = Constraints.unspentOutputs (Map.singleton oref o) <>
Constraints.typedValidatorLookups (typedOracleValidator oracle) <>
Constraints.otherScript (oracleValidator oracle)
tx = c <> Constraints.mustSpendScriptOutput oref (Redeemer $ PlutusTx.toBuiltinData Update)
ledgerTx <- submitTxConstraintsWith @Oracling lookups tx
awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "updated oracle value to " ++ show x
findOracle :: forall w s. Oracle -> Contract w s Text (Maybe (TxOutRef, TxOutTx, Integer))
findOracle oracle = do
utxos <- Map.filter f <$> utxoAt (oracleAddress oracle)
return $ case Map.toList utxos of
[(oref, o)] -> do
x <- oracleValue (txOutTxOut o) $ \dh -> Map.lookup dh $ txData $ txOutTxTx o
return (oref, o, x)
_ -> Nothing
where
f :: TxOutTx -> Bool
f o = assetClassValueOf (txOutValue $ txOutTxOut o) (oracleAsset oracle) == 1
type OracleSchema = Endpoint "update" Integer
runOracle :: OracleParams -> Contract (Last Oracle) OracleSchema Text ()
runOracle op = do
oracle <- startOracle op
tell $ Last $ Just oracle
go oracle
where
go :: Oracle -> Contract (Last Oracle) OracleSchema Text a
go oracle = do
x <- endpoint @"update"
updateOracle oracle x
go oracle

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week06.Oracle.Funds
( ownFunds
, ownFunds'
) where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Monoid (Last (..))
import Data.Text (Text)
import Plutus.Contract as Contract
import PlutusTx.Prelude hiding ((<$>))
import Prelude (Show (..), String, (<$>))
import Ledger hiding (singleton)
import Ledger.Value as Value
ownFunds :: Contract w s Text Value
ownFunds = do
pk <- ownPubKey
utxos <- utxoAt $ pubKeyAddress pk
let v = mconcat $ Map.elems $ txOutValue . txOutTxOut <$> utxos
logInfo @String $ "own funds: " ++ show (Value.flattenValue v)
return v
ownFunds' :: Contract (Last Value) Empty Text ()
ownFunds' = do
handleError logError $ ownFunds >>= tell . Last . Just
void $ Contract.waitNSlots 1
ownFunds'

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{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
module Week06.Oracle.PAB
( OracleContracts (..)
) where
import Data.Aeson (FromJSON, ToJSON)
import Data.Text.Prettyprint.Doc (Pretty (..), viaShow)
import GHC.Generics (Generic)
import Ledger
import qualified Week06.Oracle.Core as Oracle
data OracleContracts = Init | Oracle CurrencySymbol | Swap Oracle.Oracle
deriving (Eq, Ord, Show, Generic, FromJSON, ToJSON)
instance Pretty OracleContracts where
pretty = viaShow

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week06.Oracle.Swap
( SwapSchema
, swap
) where
import Control.Monad hiding (fmap)
import Data.List (find)
import qualified Data.Map as Map
import Data.Maybe (mapMaybe)
import Data.Monoid (Last (..))
import Data.Text (Text)
import Plutus.Contract as Contract
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), (<$>), unless, mapMaybe, find)
import Ledger hiding (singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Ada as Ada hiding (divide)
import Ledger.Value as Value
import Prelude (Semigroup (..), Show (..), String, (<$>))
import Week06.Oracle.Core
import Week06.Oracle.Funds
{-# INLINABLE price #-}
price :: Integer -> Integer -> Integer
price lovelace exchangeRate = (lovelace * exchangeRate) `divide` 1000000
{-# INLINABLE lovelaces #-}
lovelaces :: Value -> Integer
lovelaces = Ada.getLovelace . Ada.fromValue
{-# INLINABLE mkSwapValidator #-}
mkSwapValidator :: Oracle -> Address -> PubKeyHash -> () -> ScriptContext -> Bool
mkSwapValidator oracle addr pkh () ctx =
txSignedBy info pkh ||
(traceIfFalse "expected exactly two script inputs" hasTwoScriptInputs &&
traceIfFalse "price not paid" sellerPaid)
where
info :: TxInfo
info = scriptContextTxInfo ctx
oracleInput :: TxOut
oracleInput =
let
ins = [ o
| i <- txInfoInputs info
, let o = txInInfoResolved i
, txOutAddress o == addr
]
in
case ins of
[o] -> o
_ -> traceError "expected exactly one oracle input"
oracleValue' = case oracleValue oracleInput (`findDatum` info) of
Nothing -> traceError "oracle value not found"
Just x -> x
hasTwoScriptInputs :: Bool
hasTwoScriptInputs =
let
xs = filter (isJust . toValidatorHash . txOutAddress . txInInfoResolved) $ txInfoInputs info
in
length xs == 2
minPrice :: Integer
minPrice =
let
lovelaceIn = case findOwnInput ctx of
Nothing -> traceError "own input not found"
Just i -> lovelaces $ txOutValue $ txInInfoResolved i
in
price lovelaceIn oracleValue'
sellerPaid :: Bool
sellerPaid =
let
pricePaid :: Integer
pricePaid = assetClassValueOf (valuePaidTo info pkh) (oAsset oracle)
in
pricePaid >= minPrice
data Swapping
instance Scripts.ValidatorTypes Swapping where
type instance DatumType Swapping = PubKeyHash
type instance RedeemerType Swapping = ()
typedSwapValidator :: Oracle -> Scripts.TypedValidator Swapping
typedSwapValidator oracle = Scripts.mkTypedValidator @Swapping
($$(PlutusTx.compile [|| mkSwapValidator ||])
`PlutusTx.applyCode` PlutusTx.liftCode oracle
`PlutusTx.applyCode` PlutusTx.liftCode (oracleAddress oracle))
$$(PlutusTx.compile [|| wrap ||])
where
wrap = Scripts.wrapValidator @PubKeyHash @()
swapValidator :: Oracle -> Validator
swapValidator = Scripts.validatorScript . typedSwapValidator
swapAddress :: Oracle -> Ledger.Address
swapAddress = scriptAddress . swapValidator
offerSwap :: forall w s. Oracle -> Integer -> Contract w s Text ()
offerSwap oracle amt = do
pkh <- pubKeyHash <$> Contract.ownPubKey
let tx = Constraints.mustPayToTheScript pkh $ Ada.lovelaceValueOf amt
ledgerTx <- submitTxConstraints (typedSwapValidator oracle) tx
awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "offered " ++ show amt ++ " lovelace for swap"
findSwaps :: Oracle -> (PubKeyHash -> Bool) -> Contract w s Text [(TxOutRef, TxOutTx, PubKeyHash)]
findSwaps oracle p = do
utxos <- utxoAt $ swapAddress oracle
return $ mapMaybe g $ Map.toList utxos
where
f :: TxOutTx -> Maybe PubKeyHash
f o = do
dh <- txOutDatumHash $ txOutTxOut o
(Datum d) <- Map.lookup dh $ txData $ txOutTxTx o
PlutusTx.fromBuiltinData d
g :: (TxOutRef, TxOutTx) -> Maybe (TxOutRef, TxOutTx, PubKeyHash)
g (oref, o) = do
pkh <- f o
guard $ p pkh
return (oref, o, pkh)
retrieveSwaps :: Oracle -> Contract w s Text ()
retrieveSwaps oracle = do
pkh <- pubKeyHash <$> ownPubKey
xs <- findSwaps oracle (== pkh)
case xs of
[] -> logInfo @String "no swaps found"
_ -> do
let lookups = Constraints.unspentOutputs (Map.fromList [(oref, o) | (oref, o, _) <- xs]) <>
Constraints.otherScript (swapValidator oracle)
tx = mconcat [Constraints.mustSpendScriptOutput oref $ Redeemer $ PlutusTx.toBuiltinData () | (oref, _, _) <- xs]
ledgerTx <- submitTxConstraintsWith @Swapping lookups tx
awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "retrieved " ++ show (length xs) ++ " swap(s)"
useSwap :: forall w s. Oracle -> Contract w s Text ()
useSwap oracle = do
funds <- ownFunds
let amt = assetClassValueOf funds $ oAsset oracle
logInfo @String $ "available assets: " ++ show amt
m <- findOracle oracle
case m of
Nothing -> logInfo @String "oracle not found"
Just (oref, o, x) -> do
logInfo @String $ "found oracle, exchange rate " ++ show x
pkh <- pubKeyHash <$> Contract.ownPubKey
swaps <- findSwaps oracle (/= pkh)
case find (f amt x) swaps of
Nothing -> logInfo @String "no suitable swap found"
Just (oref', o', pkh') -> do
let v = txOutValue (txOutTxOut o) <> lovelaceValueOf (oFee oracle)
p = assetClassValue (oAsset oracle) $ price (lovelaces $ txOutValue $ txOutTxOut o') x
lookups = Constraints.otherScript (swapValidator oracle) <>
Constraints.otherScript (oracleValidator oracle) <>
Constraints.unspentOutputs (Map.fromList [(oref, o), (oref', o')])
tx = Constraints.mustSpendScriptOutput oref (Redeemer $ PlutusTx.toBuiltinData Use) <>
Constraints.mustSpendScriptOutput oref' (Redeemer $ PlutusTx.toBuiltinData ()) <>
Constraints.mustPayToOtherScript
(validatorHash $ oracleValidator oracle)
(Datum $ PlutusTx.toBuiltinData x)
v <>
Constraints.mustPayToPubKey pkh' p
ledgerTx <- submitTxConstraintsWith @Swapping lookups tx
awaitTxConfirmed $ txId ledgerTx
logInfo @String $ "made swap with price " ++ show (Value.flattenValue p)
where
getPrice :: Integer -> TxOutTx -> Integer
getPrice x o = price (lovelaces $ txOutValue $ txOutTxOut o) x
f :: Integer -> Integer -> (TxOutRef, TxOutTx, PubKeyHash) -> Bool
f amt x (_, o, _) = getPrice x o <= amt
type SwapSchema =
Endpoint "offer" Integer
.\/ Endpoint "retrieve" ()
.\/ Endpoint "use" ()
.\/ Endpoint "funds" ()
swap :: Oracle -> Contract (Last Value) SwapSchema Text ()
swap oracle = (offer `select` retrieve `select` use `select` funds) >> swap oracle
where
offer :: Contract (Last Value) SwapSchema Text ()
offer = h $ do
amt <- endpoint @"offer"
offerSwap oracle amt
retrieve :: Contract (Last Value) SwapSchema Text ()
retrieve = h $ do
endpoint @"retrieve"
retrieveSwaps oracle
use :: Contract (Last Value) SwapSchema Text ()
use = h $ do
endpoint @"use"
useSwap oracle
funds :: Contract (Last Value) SwapSchema Text ()
funds = h $ do
endpoint @"funds"
v <- ownFunds
tell $ Last $ Just v
h :: Contract (Last Value) SwapSchema Text () -> Contract (Last Value) SwapSchema Text ()
h = handleError logError

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code/week06/src/Week06/Oracle/Test.hs Normal file
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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE NumericUnderscores #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week06.Oracle.Test where
import Control.Monad hiding (fmap)
import Control.Monad.Freer.Extras as Extras
import Data.Default (Default (..))
import qualified Data.Map as Map
import Data.Monoid (Last (..))
import Data.Text (Text)
import Ledger
import Ledger.Value as Value
import Ledger.Ada as Ada
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Prelude (IO, Semigroup(..), Show (..))
import Wallet.Emulator.Wallet
import Week06.Oracle.Core
import Week06.Oracle.Funds
import Week06.Oracle.Swap
assetSymbol :: CurrencySymbol
assetSymbol = "ff"
assetToken :: TokenName
assetToken = "USDT"
test :: IO ()
test = runEmulatorTraceIO' def emCfg def myTrace
where
emCfg :: EmulatorConfig
emCfg = EmulatorConfig $ Left $ Map.fromList [(Wallet i, v) | i <- [1 .. 10]]
v :: Value
v = Ada.lovelaceValueOf 100_000_000 <>
Value.singleton assetSymbol assetToken 100_000_000
checkOracle :: Oracle -> Contract () Empty Text a
checkOracle oracle = do
m <- findOracle oracle
case m of
Nothing -> return ()
Just (_, _, x) -> Contract.logInfo $ "Oracle value: " ++ show x
Contract.waitNSlots 1 >> checkOracle oracle
myTrace :: EmulatorTrace ()
myTrace = do
let op = OracleParams
{ opFees = 1_000_000
, opSymbol = assetSymbol
, opToken = assetToken
}
h1 <- activateContractWallet (Wallet 1) $ runOracle op
void $ Emulator.waitNSlots 1
oracle <- getOracle h1
void $ activateContractWallet (Wallet 2) $ checkOracle oracle
callEndpoint @"update" h1 1_500_000
void $ Emulator.waitNSlots 3
void $ activateContractWallet (Wallet 1) ownFunds'
void $ activateContractWallet (Wallet 3) ownFunds'
void $ activateContractWallet (Wallet 4) ownFunds'
void $ activateContractWallet (Wallet 5) ownFunds'
h3 <- activateContractWallet (Wallet 3) $ swap oracle
h4 <- activateContractWallet (Wallet 4) $ swap oracle
h5 <- activateContractWallet (Wallet 5) $ swap oracle
callEndpoint @"offer" h3 10_000_000
callEndpoint @"offer" h4 20_000_000
void $ Emulator.waitNSlots 3
callEndpoint @"use" h5 ()
void $ Emulator.waitNSlots 3
callEndpoint @"update" h1 1_700_000
void $ Emulator.waitNSlots 3
callEndpoint @"use" h5 ()
void $ Emulator.waitNSlots 3
callEndpoint @"update" h1 1_800_000
void $ Emulator.waitNSlots 3
callEndpoint @"retrieve" h3 ()
callEndpoint @"retrieve" h4 ()
void $ Emulator.waitNSlots 3
where
getOracle :: ContractHandle (Last Oracle) OracleSchema Text -> EmulatorTrace Oracle
getOracle h = do
l <- observableState h
case l of
Last Nothing -> Emulator.waitNSlots 1 >> getOracle h
Last (Just oracle) -> Extras.logInfo (show oracle) >> return oracle