Oracle 预编译（Precompile）

import { ethers } from "ethers";
import { toHumanReadable } from "@injectivelabs/utils";

const provider = new ethers.JsonRpcProvider(
  "https://sentry.evm-rpc.injective.network",
);

const IPythABI = [
  {
    inputs: [{ internalType: "bytes[]", name: "updateData", type: "bytes[]" }],
    name: "getUpdateFee",
    outputs: [{ internalType: "uint256", name: "feeAmount", type: "uint256" }],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [{ internalType: "bytes[]", name: "updateData", type: "bytes[]" }],
    name: "updatePriceFeeds",
    outputs: [],
    stateMutability: "payable",
    type: "function",
  },
  {
    inputs: [
      { internalType: "bytes32", name: "id", type: "bytes32" },
      { internalType: "uint256", name: "age", type: "uint256" },
    ],
    name: "getPriceNoOlderThan",
    outputs: [
      {
        components: [
          { internalType: "int64", name: "price", type: "int64" },
          { internalType: "uint64", name: "conf", type: "uint64" },
          { internalType: "int32", name: "expo", type: "int32" },
          { internalType: "uint256", name: "publishTime", type: "uint256" },
        ],
        internalType: "struct PythStructs.Price",
        name: "price",
        type: "tuple",
      },
    ],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [{ internalType: "bytes32", name: "id", type: "bytes32" }],
    name: "getPriceUnsafe",
    outputs: [
      {
        components: [
          { internalType: "int64", name: "price", type: "int64" },
          { internalType: "uint64", name: "conf", type: "uint64" },
          { internalType: "int32", name: "expo", type: "int32" },
          { internalType: "uint256", name: "publishTime", type: "uint256" },
        ],
        internalType: "struct PythStructs.Price",
        name: "price",
        type: "tuple",
      },
    ],
    stateMutability: "view",
    type: "function",
  },
] as const;

const pyth = new ethers.Contract(
  "0x36825bf3Fbdf5a29E2d5148bfe7Dcf7B5639e320",
  IPythABI,
  provider,
);

async function main() {
  try {
    const priceFeedId =
      "0x7a5bc1d2b56ad029048cd63964b3ad2776eadf812edc1a43a31406cb54bff592"; // INJ/USD

    // const price = await pyth.getPriceUnsafe(priceFeedId);
    const maxAge = 60; // 60s
    const price = await pyth.getPriceNoOlderThan(priceFeedId, maxAge);

    console.log(
      "Human readable price:",
      price.expo > 0
        ? toHumanReadable(price.price.toString(), price.expo.toString()).toFixed(2)
        : toHumanReadable(price.price.toString(), (-price.expo).toString()).toFixed(4),
    );
  } catch (error) {
    console.error(error);
  } finally {
    await provider.destroy();
  }
}

main().catch(console.error);