Viem Redstone Wrapper

This library exports extended Public Client, Wallet Client and getContract for viem.

The extensions contain Redstone integrations for contract reads and writes.

For integration with wagmi you might want to just extend wagmi-provided clients with extendPublicClient and/or extendWalletClient.

Public Client extensions methods:

• rsRead for calling read functions.
• rsSimulate for transaction simulation.
• rsEstimateGas for transaction gas estimation.
• rsDataPackages for data package response.
• rsPrices for easy access to current data package values.
• dataFeeds for current enabled data feeds.

Wallet Client extensions methods:

• rsWrite for calling write functions.
• rsEstimateGas for transaction gas estimation.
• rsDataPackages for raw data packages response.
• rsPrices retrieve data package values (prices).
• dataFeeds for current enabled data feeds.

getContract extensions

• getContract read/write/simulate/estimateGas methods are overridden with above.

How to

Setup

Install the package from npm

pnpm i @kreskolabs/viem-redstone-connector

Setup your data service configuration when creating WalletClient and/or PublicClient:

import {
  getPublicClientRs,
  getWalletClientRs,
} from "@kreskolabs/viem-redstone-connector";
import { arbitrumGoerli } from "viem/chains";
import { MNEMONIC_TESTNET } from "../env.ts";

// Redstone Demo Data Service
const dataServiceConfig = {
  dataServiceId: "redstone-main-demo",
  uniqueSignersCount: 1,
  urls: ["https://d33trozg86ya9x.cloudfront.net"],
};

// These can be overridden per Contract and Function.
const dataFeeds = ["DAI", "ETH", "USDC"];

const publicClient = getPublicClientRs(
  {
    chain: arbitrumGoerli,
    transport: http(),
  },
  dataServicesConfig,
  dataFeeds // optional
);

const walletClient = getWalletClientRs(
  {
    chain: arbitrumGoerli,
    transport: http(), // with wagmi: custom(await account.connector.getProvider())
    account: mnemonicToAccount(MNEMONIC_TESTNET),
  },
  dataServicesConfig,
  dataFeeds // optional
);

Use with PublicClient

Reading Contracts

const ABI = parseAbi([
  "function getAccountCollateralValue(address user) view returns (uint256)",
] as const); // Type inference in viem requires `as const`

const collateralValue = await publicClient.rsRead({
  abi: ABI,
  functionName: "getAccountCollateralValue",
  args: ["0xB48bB6b68Ab4D366B4f9A30eE6f7Ee55125c2D9d"],
  address: "0x0921a7234a2762aaB3C43d3b1F51dB5D8094a04b",
  dataFeeds: ["DAI", "USDf", "ETH", "BTC"], // This is optional, you can specify these on PublicClient level in setup
});

console.assert(collateralValue > 0n, "value should be > 0");

Reading Contracts with Mock Numeric Values

const ABI = parseAbi([
  "function getAccountCollateralValue(address user) view returns (uint256)",
] as const);

const collateralValue = await publicClient.rsRead({
  abi: ABI,
  functionName: "getAccountCollateralValue",
  args: ["0xB48bB6b68Ab4D366B4f9A30eE6f7Ee55125c2D9d"],
  address: "0x0921a7234a2762aaB3C43d3b1F51dB5D8094a04b",
  dataFeeds: ["DAI", "USDf", "ETH", "BTC"],
  mockDataFeedValues: [0, 0, 0, 0], // NOTE: This enables the mock payload generation (instead of fetching from data service).
});

console.assert(collateralValue > 0n, "value should be > 0"); // In this example, the target contract still uses secondary oracle if Redstone price is 0.

Use with WalletClient

Write to Contracts

const ABI = [
  "function mintKreskoAsset(address account, address asset, uint256 amount)",
] as const;

const txHash = await walletClient.rsWrite({
  abi: ABI,
  functionName: "mintKreskoAsset",
  args: [
    walletClient.account.address,
    "0x8520C6452fc3ce680Bd1635D5B994cCE6b36D3Be",
    1000n,
  ],
  address: "0x0921a7234a2762aaB3C43d3b1F51dB5D8094a04b",
  dataFeeds: ["DAI", "USDf", "ETH", "BTC"], // This is optional, you can specify these on WalletClient level in setup
});

console.assert(!!txHash);

Write to Contracts with Mock Numeric Values

const ABI = parseAbi([
  "function mintKreskoAsset(address account, address asset, uint256 amount)",
] as const);

const txHash = await walletClient.rsWrite({
  abi: ABI,
  functionName: "mintKreskoAsset",
  args: [
    walletClient.account.address,
    "0x8520C6452fc3ce680Bd1635D5B994cCE6b36D3Be",
    1000n,
  ],
  address: "0x0921a7234a2762aaB3C43d3b1F51dB5D8094a04b",
  dataFeeds: ["DAI", "USDf", "ETH", "BTC"],
  mockDataFeedValues: [0, 0, 0, 0], // NOTE: This enables the mock payload generation (instead of fetching from data service).
});

console.assert(!!txHash);

Use with getContract

Setup

import { getContract } from "@kreskolabs/viem-redstone-connector";

...

const ABI = parseAbi([
  "function mintKreskoAsset(address account, address asset, uint256 amount)",
  "function getAccountCollateralValue(address user) view returns (uint256)",
] as const);

const contract = getContract({
  abi: ABI,
  address: "0x0921a7234a2762aaB3C43d3b1F51dB5D8094a04b",
  publicClient, // Enables `rsRead`, `rsSimulate`, `rsEstimateGas` overrides on the contract.
  walletClient, // Enables `rsWrite`, `rsEstimateGas` overrides on the contract.
  dataFeeds: ["DAI", "USDf"], // Optional. Overrides Client level dataFeeds set.
  /* mockDataFeedValues: [1,1] */ // for mocked numeric values
});

Usage

/// Read
const collateralValue = await contract.read.getAccountCollateralValue(
  ["0xB48bB6b68Ab4D366B4f9A30eE6f7Ee55125c2D9d"],
  {
    dataFeeds: ["DAI", "USDf", "ETH", "BTC"], // Optional override.
    mockDataFeedValues: [1, 1, 1900, 30500],
  }
);

console.assert(collateralValue > 0n, "value should be > 0 ");

/// Write
const txHash = await contract.write.mintKreskoasset(
  [
    "0xB48bB6b68Ab4D366B4f9A30eE6f7Ee55125c2D9d",
    "0x8520C6452fc3ce680Bd1635D5B994cCE6b36D3Be",
    1000n,
  ],
  {
    dataFeeds: ["DAI", "USDf", "ETH", "BTC"], // Optional override.
    /* mockDataFeedValues: [1,1,1900,30500] */ // for mocked numeric values
  }
);

console.assert(!!txHash);

/// Estimage Gas
const gasEstimate = await contract.estimateGas.mintKreskoasset(
  [
    "0xB48bB6b68Ab4D366B4f9A30eE6f7Ee55125c2D9d",
    "0x8520C6452fc3ce680Bd1635D5B994cCE6b36D3Be",
    1000n,
  ],
  {
    dataFeeds: ["DAI", "USDf", "ETH", "BTC"], // Optional override.
    /* mockDataFeedValues: [1,1,1900,30500] */ // for mocked numeric values
  }
);

console.assert(gasEstimate > 0n, "gas estimate should be > 0");

/// Simulate Transaction
const simulateResult = await contract.simulate.mintKreskoasset(
  [
    "0xB48bB6b68Ab4D366B4f9A30eE6f7Ee55125c2D9d",
    "0x8520C6452fc3ce680Bd1635D5B994cCE6b36D3Be",
    1000n,
  ],
  {
    dataFeeds: ["DAI", "USDf", "ETH", "BTC"], // Optional override.
    /* mockDataFeedValues: [1,1,1900,30500] */ // for mocked numeric values
  }
);

console.assert(!!simulateResult);