feat: chainlink vrf rng deploy script

contracts/deploy/00-chainlink-rng.ts

@@ -0,0 +1,76 @@
+import { HardhatRuntimeEnvironment } from "hardhat/types";
+import { DeployFunction } from "hardhat-deploy/types";
+import { HomeChains, isSkipped } from "./utils";
+import { getContractOrDeploy } from "./utils/getContractOrDeploy";
+
+const deployArbitration: DeployFunction = async (hre: HardhatRuntimeEnvironment) => {
+  const { deployments, getNamedAccounts, getChainId } = hre;
+  const { deploy } = deployments;
+
+  // fallback to hardhat node signers on local network
+  const deployer = (await getNamedAccounts()).deployer ?? (await hre.ethers.getSigners())[0].address;
+  const chainId = Number(await getChainId()) as unknown as HomeChains; // Checked at runtime by skip()
+  console.log("deploying to %s with deployer %s", HomeChains[chainId], deployer);
+
+  const KEY_HASHES = {
+    // https://docs.chain.link/vrf/v2-5/supported-networks#arbitrum-mainnet
+    [HomeChains.ARBITRUM_ONE]: {
+      2: "0x9e9e46732b32662b9adc6f3abdf6c5e926a666d174a4d6b8e39c4cca76a38897",
+      30: "0x8472ba59cf7134dfe321f4d61a430c4857e8b19cdd5230b09952a92671c24409",
+      150: "0xe9f223d7d83ec85c4f78042a4845af3a1c8df7757b4997b815ce4b8d07aca68c",
+    },
+    // https://docs.chain.link/vrf/v2-5/supported-networks#arbitrum-sepolia-testnet
+    [HomeChains.ARBITRUM_SEPOLIA]: {
+      150: "0x1770bdc7eec7771f7ba4ffd640f34260d7f095b79c92d34a5b2551d6f6cfd2be",
+    },
+    [HomeChains.HARDHAT]: {
+      0: "0x0000000000000000000000000000000000000000000000000000000000000000",
+    },
+  };
+
+  const SUBSCRIPTION_ID = {
+    [HomeChains.ARBITRUM_ONE]: "66240499937595191069677958665918759554657443303079118766000192000140992834352",
+    [HomeChains.ARBITRUM_SEPOLIA]: "38502597312983100069991953687934627561654236680431968938019951490339399569548",
+    [HomeChains.HARDHAT]: "0x0000000000000000000000000000000000000000000000000000000000000000",
+  };
+
+  function getKeyHash({ gasPrice }: { gasPrice: keyof (typeof KEY_HASHES)[HomeChains.ARBITRUM_ONE] }): string {
+    if (chainId == HomeChains.HARDHAT) return KEY_HASHES[chainId][0];
+    if (chainId == HomeChains.ARBITRUM_ONE) return KEY_HASHES[chainId][gasPrice];
+    if (chainId == HomeChains.ARBITRUM_SEPOLIA) return KEY_HASHES[chainId][150];
+    throw new Error(`Unknown chainId ${chainId}`);
+  }
+
+  const ChainlinkVRFCoordinator = await getContractOrDeploy(hre, "ChainlinkVRFCoordinator", {
+    from: deployer,
+    contract: "ChainlinkVRFCoordinator",
+    args: [],
+    log: true,
+  });
+
+  const keyHash = getKeyHash({ gasPrice: 150 });
+  const subscriptionId = SUBSCRIPTION_ID[chainId];
+  const requestConfirmations = 200; // between 1 and 200 L2 blocks
+  const callbackGasLimit = 100000;
+
+  await deploy("ChainlinkRNG", {
+    from: deployer,
+    args: [
+      deployer,
+      deployer,
+      ChainlinkVRFCoordinator.target,
+      keyHash,
+      subscriptionId,
+      requestConfirmations,
+      callbackGasLimit,
+    ],
+    log: true,
+  });
+};
+
+deployArbitration.tags = ["ChainlinkRNG"];
+deployArbitration.skip = async ({ network }) => {
+  return isSkipped(network, !HomeChains[network.config.chainId ?? 0]);
+};
+
+export default deployArbitration;

contracts/deployments/arbitrum/ChainlinkVRFCoordinator.json

@@ -0,0 +1,18 @@
+{
+  "address": "0xf97f4df75117a78c1A5a0DBb814Af92458539FB4",
+  "abi": [
+    {
+      "inputs": [],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "stateMutability": "payable",
+      "type": "fallback"
+    },
+    {
+      "stateMutability": "payable",
+      "type": "receive"
+    }
+  ]
+}