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10
README.md
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- Native Tokens.
- NFT's.
- [Lecture #6](https://youtu.be/24SHPHEc3zo)
- Oracles.
- Using the PAB.
## Code Examples
- Lecture #1: [English Auction](code/week01)
@ -43,6 +48,7 @@
- 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
@ -86,6 +92,10 @@
- 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.

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code/week06/.devcontainer/devcontainer.json Normal file
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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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{-# 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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code/week06/app/oracle-pab.hs Normal file
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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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{-# 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