Regarding the latest chain headers response format change

[gupadhyaya]

I wanted to give a heads-up on the upcoming change to latest chain headers rpc response format change. The change is currently deployed to testnet and will soon be pushed to mainnet. This is required to make ethereum tooling compatible (e.g., chainlink). I am aware that many validator tools rely on this, hence asking if there any concerns in updating your tooling.

Before:

./hmy -n https://api.s0.t.hmny.io blockchain latest-headers
{
  "id": "0",
  "jsonrpc": "2.0",
  "result": {
    "beacon-chain-header": {
      "block-header-hash": "0x3db1639202e5333bac1e635796f307ebc8ae4a9d7791f89624de768823123d70",
      "block-number": 11711625,
      "epoch": 530,
      "shard-id": 0,
      "view-id": 11711962
    },
    "shard-chain-header": {
      "block-header-hash": "0x3db1639202e5333bac1e635796f307ebc8ae4a9d7791f89624de768823123d70",
      "block-number": 11711625,
      "epoch": 530,
      "shard-id": 0,
      "view-id": 11711962
    }
  }
}

After:

./hmy -n https://api.s0.b.hmny.io blockchain latest-headers
{
  "id": "0",
  "jsonrpc": "2.0",
  "result": {
    "beacon-chain-header": {
      "difficulty": "0x0",
      "epoch": 73679,
      "extraData": "0x",
      "gasLimit": "0x4c4b400",
      "gasUsed": "0x0",
      "hash": "0xec767a28f8002c0d30b3198010924f88096fd213c2b4831a8809ca0492528282",
      "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
      "miner": "0x3f6e680ec5456f540a833e77df4c8ed20a20f274",
      "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "nonce": "0x0000000000000000",
      "number": "0x7f3832",
      "parentHash": "0x52a577e98dd73f0cc186d5a423e6d5e7d8c26b74986b54106790180a3588a860",
      "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      "sha3Uncles": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "shardID": 0,
      "stateRoot": "0x1808695162c90c02743aa47cea077ab7977275e8a4b3993ae2a6fa6bc445dcb3",
      "timestamp": "0x6076178f",
      "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      "viewID": 8337804
    },
    "shard-chain-header": {
      "difficulty": "0x0",
      "epoch": 73679,
      "extraData": "0x",
      "gasLimit": "0x4c4b400",
      "gasUsed": "0x0",
      "hash": "0xec767a28f8002c0d30b3198010924f88096fd213c2b4831a8809ca0492528282",
      "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
      "miner": "0x3f6e680ec5456f540a833e77df4c8ed20a20f274",
      "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "nonce": "0x0000000000000000",
      "number": "0x7f3832",
      "parentHash": "0x52a577e98dd73f0cc186d5a423e6d5e7d8c26b74986b54106790180a3588a860",
      "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      "sha3Uncles": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "shardID": 0,
      "stateRoot": "0x1808695162c90c02743aa47cea077ab7977275e8a4b3993ae2a6fa6bc445dcb3",
      "timestamp": "0x6076178f",
      "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      "viewID": 8337804
    }
  }
}

Also the rpcs impacted are:

curl --location --request POST 'https://api.s0.b.hmny.io' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "hmyv2_getLatestChainHeaders",
    "params": []
}'

and

curl --location --request POST 'https://rpc.s0.b.hmny.io' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "hmy_getLatestChainHeaders",
    "params": []
}'

Also, the newBlockHeaders subscription:

web3.eth
  .subscribe("newBlockHeaders", function (error, result) {
    if (!error) {
        console.log(result);
      return;
    }

    console.error(error);
  })
  .on("connected", function (subscriptionId) {
    console.log(subscriptionId);
  })
  .on("data", function (blockHeader) {
      console.log(blockHeader);
  })
  .on("error", console.error);

PRs responsible for this change: #3655, #3658, and #3659

[sophoah]

@gupadhyaya can you see if #3662 could be related to that change ? cc @mirrormirage0

[LeoHChen]

@gupadhyaya , is this change only impact RPC hmyv2_getLatestChainHeaders? how about the old hmy_getLatestChainHeaders api?

[gupadhyaya]

@gupadhyaya , is this change only impact RPC hmyv2_getLatestChainHeaders? how about the old hmy_getLatestChainHeaders api?

yes. updated.

[rlan35]

is this issue fixed now? we can close if fixed.