Amazon Managed Blockchain (AMB) Access Polygon 入門

下列範例示範如何使用 eth_getBlockByNumber RPC 取得最新區塊的相關資訊。將反白顯示的變數變更為您自己的輸入，或選擇列出的其中一個 RPC 方法，然後輸入所需的相關輸入。

使用 Signature 第 4 版 (SigV4) 使用您的 IAM 使用者憑證簽署請求，以便對 AMB Access Polygon 端點發出多邊形 JSON-RPC 請求。awscurl 命令列工具可協助您使用 SigV4 簽署對 AWS 服務的請求。如需詳細資訊，請參閱 awscurl README.md：//。

使用適用於您作業系統的 方法awscurl安裝 。在 macOS 上，建議使用 HomeBrew 應用程式：

brew install awscurl

如果您已安裝並設定 AWS CLI，您的 IAM 使用者登入資料和預設值 AWS 區域 會在您的環境中設定，並可存取 awscurl。使用 awscurl，透過叫用 eth_getBlockByNumber RPC 向 Polygon Mainnet 提交請求。此呼叫接受對應至您要擷取資訊的區塊號碼的字串參數。

下列命令會使用params陣列中的區塊號碼，選取要擷取標頭的特定區塊，從 Polygon Mainnet 擷取區塊資料。

awscurl -X POST -d '{ "jsonrpc": "2.0", "id": "eth_getBlockByNumber-curltest", "method":"eth_getBlockByNumber", "params":["latest", false] }' --service managedblockchain https://mainnet.polygon.managedblockchain.us-east-1.amazonaws.com -k

curl -X POST -d '{"jsonrpc":"2.0", "id": "eth_getBlockByNumber-curltest", "method":"eth_getBlockByNumber", "params":["latest", false] }' 'https://mainnet.polygon.managedblockchain.us-east-1.amazonaws.com?billingtoken=your-billing-token'
    

任一命令的回應都會傳回最新區塊的相關資訊。如需說明，請參閱下列範例：

{"error":null,"id":"eth_getBlockByNumber-curltest","jsonrpc":"1.0",
      "result":{"baseFeePerGas":"0x873bf591e","difficulty":"0x18",
      "extraData":"0xd78301000683626f7288676f312e32312e32856c696e757800000000000000009a\
      423a58511085d90eaf15201a612af21ccbf1e9f8350455adaba0d27eff0ecc4133e8cd255888304cc\
      67176a33b451277c2c3c1a6a6482d2ec25ee1573e8ba000",
      "gasLimit":"0x1c9c380","gasUsed":"0x14ca04d",
      "hash":"0x1ee390533a3abc3c8e1306cc1690a1d28d913d27b437c74c761e1a49********;",
      "nonce":"0x0000000000000000","number":"0x2f0ec4d",
      "parentHash":"0x27d47bc2c47a6d329eb8aa62c1353f60e138fb0c596e3e8e9425de163afd6dec",
      "receiptsRoot":"0x394da96025e51cc69bbe3644bc4e1302942c2a6ca6bf0cf241a5724c74c063fd",
      "sha3Uncles":"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
      "size":"0xbd6b",
      "stateRoot":"0x7ca9363cfe9baf4d1c0dca3159461b2cca8604394e69b30af05d7d5c1beea6c3",
      "timestamp":"0x653ff542",
      "totalDifficulty":"0x33eb01dd","transactions":[...],
      "transactionsRoot":"0xda1602c66ffd746dd470e90a47488114a9d00f600ab598466ecc0f3340b24e0c",
      "uncles":[]}}

若要執行此範例 Node.js 指令碼，請套用下列先決條件：

完成所有先決條件後，請使用您偏好的程式碼編輯器，將下列檔案複製到本機環境中的目錄：

package.json

{
  "name": "polygon-rpc",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "ethers": "^6.8.1",
    "@aws-crypto/sha256-js": "^5.2.0",
    "@aws-sdk/credential-provider-node": "^3.360.0",
    "@aws-sdk/protocol-http": "^3.357.0",
    "@aws-sdk/signature-v4": "^3.357.0",
    "axios": "^1.6.2"
  }
}

dispatch-evm-rpc.js

const axios = require("axios");
const SHA256 = require("@aws-crypto/sha256-js").Sha256;
const defaultProvider = require("@aws-sdk/credential-provider-node").defaultProvider;
const HttpRequest = require("@aws-sdk/protocol-http").HttpRequest;
const SignatureV4 = require("@aws-sdk/signature-v4").SignatureV4;

// define a signer object with AWS service name, credentials, and region
const signer = new SignatureV4({
  credentials: defaultProvider(),
  service: "managedblockchain",
  region: "us-east-1",
  sha256: SHA256,
});
const rpcRequest = async (rpcEndpoint, rpc) => {
 
  // parse the URL into its component parts (e.g. host, path)
  let url = new URL(rpcEndpoint);

  // create an HTTP Request object
  const req = new HttpRequest({
    hostname: url.hostname.toString(),
    path: url.pathname.toString(),
    body: JSON.stringify(rpc),
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "Accept-Encoding": "gzip",
      host: url.hostname,
    },
  });

  // use AWS SignatureV4 utility to sign the request, extract headers and body
  const signedRequest = await signer.sign(req, { signingDate: new Date() });

  try {
    //make the request using axios
    const response = await axios({
      ...signedRequest,
      url: url,
      data: req.body,
    });
    return response.data;
  } catch (error) {
    console.error("Something went wrong: ", error);
  }
};

module.exports = { rpcRequest: rpcRequest };

sendTx.js

const ethers = require("ethers");

//set AMB Access Polygon endpoint using token based access (TBA)
let token = "your-billing-token"
let url = `https://mainnet.polygon.managedblockchain.us-east-1.amazonaws.com?billingtoken=${token}`;

//prevent batch RPCs
let options = {
  batchMaxCount: 1,
};

//create JSON RPC provider with AMB Access endpoint and options
let provider = new ethers.JsonRpcProvider(url, null, options);

let sendTx = async (to) => {
  //create an instance of the Wallet class with a private key 
  //DO NOT USE A WALLET YOU USE ON MAINNET, NEVER USE A RAW PRIVATE KEY IN PROD
  let pk = "wallet-private-key";
  let signer = new ethers.Wallet(pk, provider);

  //use this wallet to send a transaction of POL from one address to another
  const tx = await signer.sendTransaction({
    to: to,
    value: ethers.parseUnits("0.0001", "ether"),
  });

  console.log(tx);
};

sendTx("recipent-address");

readTx.js

let rpcRequest = require("./dispatch-evm-rpc").rpcRequest;
let ethers = require("ethers");

let getTxDetails = async (txHash) => {
  //set url to a Signature Version 4 endpoint for AMB Access
  let url = "https://mainnet.polygon.managedblockchain.us-east-1.amazonaws.com";

  //set RPC request body to get transaction details
  let getTransactionByHash = {
    id: "1",
    jsonrpc: "2.0",
    method: "eth_getTransactionByHash",
    params: [txHash],
  };

  //make RPC request for transaction details
  let txDetails = await rpcRequest(url, getTransactionByHash);
  
  //set RPC request body to get recipient user balance
  let getBalance = {
    id: "2",
    jsonrpc: "2.0",
    method: "eth_getBalance",
    params: [txDetails.result.to, "latest"],
  };
    
  //make RPC request for recipient user balance
  let recipientBalance = await rpcRequest(url, getBalance);

  console.log("TX DETAILS: ", txDetails.result, "BALANCE: ", ethers.formatEther(recipientBalance.result));
};

getTxDetails("your-transaction-id");

將這些檔案儲存至您的目錄後，請使用下列命令安裝執行程式碼所需的相依性：

npm install