provider.on("block") should return the entire block information

[mohamedmansour]

When listening on block events, the callback only returns the blockNumber but the websocket to geth returns all that data. How do we get that data from each websocket message instead of issuing another call to geth?

{
  "jsonrpc": "2.0",
  "method": "eth_subscription",
  "params": {
    "subscription": "0x98e45eaaf9242fbb6d2edf52d0a9bca1",
    "result": {
      "parentHash": "0x2fb301ff655e8af806c0da11daaf0c9aa882af927959b65fb4af1917499f20c9",
      "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
      "miner": "0x829bd824b016326a401d083b33d092293333a830",
      "stateRoot": "0x84945146609a475a71f703bfad114c058133d35a5da9fc416bb0591c1acbf4de",
      "transactionsRoot": "0x4ae6d69efa15abb03c561dcf90117fefb1f81fa3b997f48837448614d5a75641",
      "receiptsRoot": "0x2ec744df91149f0964e696847faa21f9466ad4dceef81fed5f1dc3ff7b0dbe82",
      "logsBloom": "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",
      "difficulty": "0x1aa72e5f962132",
      "number": "0xc59dae",
      "gasLimit": "0xe4e1c0",
      "gasUsed": "0xe4db85",
      "timestamp": "0x6108ee88",
      "extraData": "0xe4b883e5bda9e7a59ee4bb99e9b1bc0b0621",
      "mixHash": "0x403ffff8884b080d6e143c6fbbceae263c65c083a56831871373199cd77eac93",
      "nonce": "0x4e94f378e7afac3b",
      "baseFeePerGas": null,
      "hash": "0x31cda7e47694880f1d60698ae08fb1504b80d3a8be47b9595e8fce3e4dbc81fd"
    }
  }
}

meanwhile the ethers code does the following:

         case "block":
                this._subscribe("block", ["newHeads"], (result) => {
                    const blockNumber = BigNumber.from(result.number).toNumber();
                    this._emitted.block = blockNumber;
                    this.emit("block", blockNumber);
                });
                break;

How do I get all the block data without an extra call to eth.getBlock which does a websocket call as well.

[ricmoo]

The block event only returns the block number, as this is was the lightest call needed to detect when to check for changes on chain on JSON-RPC and third-party nodes.

In v6, it may make sense to add another event to specify fetching the entire block header.

For now, it should be safe to use the _subscribe method, à la:

this._subscribe("newHeads", ["newHeads"], (result) => {
  // Parse and format the block data into the same format as `getBlock()` would provide
  const block = this.formatter.block(result);
  // your code here...
});

I will not be removing or changing the signature of this call before v6, so it is safe to call this way. But it is best to use a tag not already used by ethers as the first parameter to _subscribe.

Does that help?

[hyperboop]

In v6, it may make sense to add another event to specify fetching the entire block header.

Does this exist yet? Can't seem to find anything related.

[adedade]

Just to clarify, is there today a way to subscribe to new block headers?

[0xcaff]

This is the way. This code

import { ethers } from "ethers";

async function main() {
  const alchemy = new ethers.providers.AlchemyWebSocketProvider(
    "mainnet",
    process.env.ALCHEMY_API_KEY
  );

  alchemy._subscribe("newHeads", ["newHeads"], (result) => {
    console.log({ result });
  });
}

main();

emits the following

{
  result: {
    baseFeePerGas: '0x417e5e8e2',
    difficulty: '0x0',
    extraData: '0x506f776572656420627920626c6f58726f757465',
    gasLimit: '0x1c9c380',
    gasUsed: '0xcc4c47',
    hash: '0x2f6edba1b582211da7870d3c94be7ad242c99d638ce383f28de9d711142f908c',
    logsBloom: '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',
    miner: '0xf2f5c73fa04406b1995e397b55c24ab1f3ea726c',
    mixHash: '0x44712a0f12ea01163207800341a24df4b7ba7e829f1ae2607f1da68caf74415c',
    nonce: '0x0000000000000000',
    number: '0xf8cd7f',
    parentHash: '0x97f302ec31b99c0a3f51a8e72ef83ae69a9d7f6ef3a91cf079ed9857ef9510c4',
    receiptsRoot: '0x59bc9d8e015d7c1ce8e931e9f951011c82249f86edc76339fc5b2023edfd2e9c',
    sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
    size: '0xf298',
    stateRoot: '0xf45e9f7caa9c936c6f99501c3b9fdb86426928ad92403100b64dfe4ebd7eb075',
    timestamp: '0x63b05037',
    transactionsRoot: '0xef0e5755fd22d70ecc9a6ed311ba96d0783f6bee6436370748af9be3de19343e'
  }
}
{
  result: {
    baseFeePerGas: '0x409d43487',
    difficulty: '0x0',
    extraData: '0x6265617665726275696c642e6f7267',
    gasLimit: '0x1c9c380',
    gasUsed: '0x9b7b86',
    hash: '0x8bc174717871c39fa20ebee2f60912f12f446ab7b83ec15957b1fd3f5aba1448',
    logsBloom: '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',
    miner: '0x95222290dd7278aa3ddd389cc1e1d165cc4bafe5',
    mixHash: '0x781d4daa9782b2187ec9c47b9f63b50c7c61b79d3a6883fe29ff1b0153976f81',
    nonce: '0x0000000000000000',
    number: '0xf8cd80',
    parentHash: '0x2f6edba1b582211da7870d3c94be7ad242c99d638ce383f28de9d711142f908c',
    receiptsRoot: '0x1988f64ccef5308de8223be3c52ea351635287945f83d27517a70211a4b8c842',
    sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
    size: '0x11ea6',
    stateRoot: '0xa0136eae3461b110eb1eb1ba52ed77863e18d5f2ac37da6b632db54bbb1b976e',
    timestamp: '0x63b05043',
    transactionsRoot: '0x91dac79f7f6b0dd8b84ce36eae3b4e49abf9444d961d5e38410c9d3222609423'
  }
}
{
  result: {
    baseFeePerGas: '0x3e06315b1',
    difficulty: '0x0',
    extraData: '0x',
    gasLimit: '0x1c9c380',
    gasUsed: '0xccc501',
    hash: '0x0571b344f9095dfbdc1151346107f432be96252ab8f37e6cc0156cc70f2f3cf1',
    logsBloom: '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',
    miner: '0xc29a440e4bbbb506949edb7f76df06d76a7bb0b2',
    mixHash: '0xce1101b7db515739b14a1180b5562d9756e7336f9d46f97a0c6d05afcaf305a2',
    nonce: '0x0000000000000000',
    number: '0xf8cd81',
    parentHash: '0x8bc174717871c39fa20ebee2f60912f12f446ab7b83ec15957b1fd3f5aba1448',
    receiptsRoot: '0x0068d138dbd9ccb72c8df9ca0b5f122286afdfecef683c7117c5cec0c668c891',
    sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
    size: '0x13f66',
    stateRoot: '0xc663ec3c4e11c38184c7eaf512381c94a394fbb40fdc3db2c010561f30c9e689',
    timestamp: '0x63b0504f',
    transactionsRoot: '0xeaf2f34b19260b8551d6c106a5dfad22de99147f230a7e3b2732a7c42f17a3d4'
  }
}
{
  result: {
    baseFeePerGas: '0x3d3519b4f',
    difficulty: '0x0',
    extraData: '0x6265617665726275696c642e6f7267',
    gasLimit: '0x1c9c380',
    gasUsed: '0xd02a21',
    hash: '0x255889f00e603aa16a2b884a6b3bf841bbe6eba344b90451ba8bc6e57bb69693',
    logsBloom: '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',
    miner: '0x95222290dd7278aa3ddd389cc1e1d165cc4bafe5',
    mixHash: '0x5fed3fe5175a8434642f76ceb289fad380d2cb946792f7617ca1441f3d954ac0',
    nonce: '0x0000000000000000',
    number: '0xf8cd82',
    parentHash: '0x0571b344f9095dfbdc1151346107f432be96252ab8f37e6cc0156cc70f2f3cf1',
    receiptsRoot: '0x0a827bedbdd9e3b3045fe2be5fad9b2c8f8666146fa0b76a2a54fc8ab2fee120',
    sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
    size: '0x171c1',
    stateRoot: '0xb87142544c3f78280c64d496a3fb4197ff99298edfb20447516ebad2b5949626',
    timestamp: '0x63b0505b',
    transactionsRoot: '0x27a6317ede92b34f994e06391883d2380f9b6f8c9546093f873ea4897e81f78a'
  }
}
{
  result: {
    baseFeePerGas: '0x3c83d0677',
    difficulty: '0x0',
    extraData: '0x',
    gasLimit: '0x1c9c380',
    gasUsed: '0x3e9522',
    hash: '0x2a95b73b9e8962518f850f20d05998c33225b985f1a7fb03785d531f7b7f118b',
    logsBloom: '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',
    miner: '0xffee087852cb4898e6c3532e776e68bc68b1143b',
    mixHash: '0x0a16dce1fcc6765122254da3273183abeacbe4f09aca38588681fa11754c8c32',
    nonce: '0x0000000000000000',
    number: '0xf8cd83',
    parentHash: '0x255889f00e603aa16a2b884a6b3bf841bbe6eba344b90451ba8bc6e57bb69693',
    receiptsRoot: '0x7a61f06d185faae622f14bd0f7a7827466ea3ba07efd6906ed1798f6134eb53e',
    sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
    size: '0x4556',
    stateRoot: '0x3c29d603218f042784018d59aa19a18da553d4d7558c2126d63a780cde99210b',
    timestamp: '0x63b05067',
    transactionsRoot: '0xc6a03a3bf77aafa2bc369fc7e8face96148d2209d325e14a943f1786626e1491'
  }
}
{
  result: {
    baseFeePerGas: '0x3704d2afd',
    difficulty: '0x0',
    extraData: '0x6d617273',
    gasLimit: '0x1c9c380',
    gasUsed: '0x1bd2f29',
    hash: '0x204bc36be14792d4f68f7a4833eb31a4bb9cf0d32bd374a17dc398b6f0a4ee4a',
    logsBloom: '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',
    miner: '0xeeee8db5fc7d505e99970945a9220ab7992050e3',
    mixHash: '0x669240048a37acac5c86539794ce21ca436046e4491a6fb38e81032e9c17bc50',
    nonce: '0x0000000000000000',
    number: '0xf8cd84',
    parentHash: '0x2a95b73b9e8962518f850f20d05998c33225b985f1a7fb03785d531f7b7f118b',
    receiptsRoot: '0x0a56a743a4c2b2ecee183cf8110c9aac314cfac8adea71207c9823ede6000bd6',
    sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347',
    size: '0x39c5a',
    stateRoot: '0x35e36f6597b7c9b5f19d9ff1a159dcee03dddc8a7602844fed77e44209c07b98',
    timestamp: '0x63b05073',
    transactionsRoot: '0x90653a20146ea8732f0a4f66c3dd0abe91389b86df2d737a74ce00fae2bd3290'
  }
}

[BlankerL]

Does the provider._subscribe seem not to be working after ethers.js v6? What do you think I should refer to?

[ghost]

Try this

const { SocketBlockSubscriber } = require('ethers'):

const provider = new WebSocketProvider(url);
const blockSub = new SocketBlockSubscriber(provider);

blockSub._handleMessage = (result) => {
    console.log(provider._wrapBlock({...result, transactions: []}));
 };
blockSub.start();