faucet.ts

import "reflect-metadata";
import { getRequiredEnv } from "../../utils/loadEnv";

export default async function (publicKey: string) {
  const { AccountUpdate, fetchAccount, Lightnet, Mina, Provable, PublicKey } =
    await import("o1js");
  // configuration
  const fee = 0.1 * 1e9;
  const fundingAmount = 1000 * 1e9;

  const net = Mina.Network({
    mina: `${getRequiredEnv("MINA_NODE_GRAPHQL_HOST")}:${getRequiredEnv("MINA_NODE_GRAPHQL_PORT")}/graphql`,
    archive: `${getRequiredEnv("MINA_ARCHIVE_GRAPHQL_HOST")}:${getRequiredEnv("MINA_ARCHIVE_GRAPHQL_PORT")}/graphql`,
    lightnetAccountManager: `${getRequiredEnv("MINA_ACCOUNT_MANAGER_HOST")}:${getRequiredEnv("MINA_ACCOUNT_MANAGER_PORT")}`,
  });

  Mina.setActiveInstance(net);

  // get the source account from the account manager
  const pair = await Lightnet.acquireKeyPair({
    isRegularAccount: true,
  });

  // which account to drip to
  const keyArg = process.env[publicKey] ?? publicKey;

  if (keyArg?.length === 0) {
    throw new Error("No key provided");
  }

  const key = PublicKey.fromBase58(keyArg);

  await fetchAccount({ publicKey: pair.publicKey });

  Provable.log(
    `Dripping ${fundingAmount / 1e9} MINA from ${pair.publicKey.toBase58()} to ${key.toBase58()}`
  );

  const tx = await Mina.transaction(
    {
      sender: pair.publicKey,
      fee,
    },
    async () => {
      const account = await fetchAccount({ publicKey: key });
      // if the destination account does not exist yet, pay the creation fee for it
      if (account.error) {
        AccountUpdate.fundNewAccount(pair.publicKey);
      }

      AccountUpdate.createSigned(pair.publicKey).balance.subInPlace(
        fundingAmount
      );
      AccountUpdate.create(key).balance.addInPlace(fundingAmount);
    }
  );

  tx.sign([pair.privateKey]);

  const sentTx = await tx.send();
  await sentTx.wait();

  Provable.log(
    `Funded account ${key.toBase58()} with ${fundingAmount / 1e9} MINA`
  );

  await Lightnet.releaseKeyPair({
    publicKey: pair.publicKey.toBase58(),
  });
}