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Last active July 14, 2023 16:05
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Lucid Emulator
// $ deno run -A always_succeeds.ts
import {
Address,
Data,
Emulator,
generatePrivateKey,
Lovelace,
Lucid,
PrivateKey,
SpendingValidator,
TxHash,
UTxO,
} from "https://deno.land/x/lucid/mod.ts";
// Define wallets, balances and Custom network
const privateKeyAlice = generatePrivateKey();
const privateKeyBob = generatePrivateKey();
const addressAlice = await (await Lucid.new(undefined, "Custom"))
.selectWalletFromPrivateKey(privateKeyAlice).wallet.address();
const addressBob = await (await Lucid.new(undefined, "Custom"))
.selectWalletFromPrivateKey(privateKeyBob).wallet.address();
const emulator = new Emulator([{
address: addressAlice,
assets: { lovelace: 2000000000n },
}, {
address: addressBob,
assets: { lovelace: 3000000000n },
}]);
// Define: Smart Contract (always succeeds)
const alwaysSucceedScript: SpendingValidator = {
type: "PlutusV2",
script: "49480100002221200101",
};
const Datum = () => Data.void();
const Redeemer = () => Data.void();
// Start Custom Network
const lucid = await Lucid.new(emulator);
// Generate Script Address from Contract
const alwaysSucceedAddress: Address = lucid.utils.validatorToAddress(
alwaysSucceedScript,
);
function getBalance(privateKey: PrivateKey): Promise<UTxO[]> {
// Set wallet to given owner for this transaction
const owner: Lucid = lucid.selectWalletFromPrivateKey(privateKey);
return owner.wallet.getUtxos();
}
async function lockUtxo(
privateKey: PrivateKey,
lovelace: Lovelace,
): Promise<TxHash> {
// Set wallet to given owner for this transaction
lucid.selectWalletFromPrivateKey(privateKey);
const tx = await lucid
.newTx()
.payToContract(alwaysSucceedAddress, { inline: Datum() }, { lovelace })
.payToContract(alwaysSucceedAddress, {
asHash: Datum(),
scriptRef: alwaysSucceedScript, // adding plutusV2 script to output
}, {})
.complete();
const signedTx = await tx.sign().complete();
const txHash = await signedTx.submit();
return txHash;
}
try {
console.log("Alice before sending to script");
console.log(await getBalance(privateKeyAlice));
console.log("Bob before sending to script");
console.log(await getBalance(privateKeyBob));
console.log("Script Address before transaction");
console.log(await lucid.utxosAt(alwaysSucceedAddress));
await lockUtxo(privateKeyAlice, 100000000n);
emulator.awaitBlock(4);
console.log("Script Address after transaction");
console.log(await lucid.utxosAt(alwaysSucceedAddress));
await redeemUtxo(privateKeyBob);
emulator.awaitBlock(4);
console.log("Bob after spending from script");
console.log(await getBalance(privateKeyBob));
} catch (_e) {
console.error(
"Error: something went wrong.",
);
}
async function redeemUtxo(privateKey: PrivateKey): Promise<TxHash> {
const owner: Lucid = lucid.selectWalletFromPrivateKey(privateKey);
const referenceScriptUtxo = (await owner.utxosAt(alwaysSucceedAddress)).find(
(utxo) => Boolean(utxo.scriptRef),
);
if (!referenceScriptUtxo) throw new Error("Reference script not found");
const utxo = (await owner.utxosAt(alwaysSucceedAddress)).find((utxo) =>
utxo.datum === Datum() && !utxo.scriptRef
);
if (!utxo) throw new Error("Spending script utxo not found");
const tx = await owner
.newTx()
.readFrom([referenceScriptUtxo]) // spending utxo by reading plutusV2 from reference utxo
.collectFrom([utxo], Redeemer())
.complete();
const signedTx = await tx.sign().complete();
const txHash = await signedTx.submit();
return txHash;
}
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