Cant connect to the local websocket server using websocketprovider

[ArnabChatterjee20k]

Ethers Version

6

Search Terms

No response

Describe the Problem

I am using websocketprovider to listen for the events and thus build my own local websockets but everytime I am getting unexpected response.

Code Snippet

### WebSocketServer

const WebSocketServer = require("websocket").server;
const http = require("http");

const server = http.createServer((request, response) => {
  // This is just a placeholder for your HTTP server logic
  response.writeHead(404);
  response.end();
});

const wsServer = new WebSocketServer({
  httpServer: server,
  autoAcceptConnections: false,
});

wsServer.on("request", (request) => {
  const connection = request.accept(null, request.origin);
  console.log("Connection accepted.");

  connection.on("message", (message) => {
    console.log(message);
    connection.send(JSON.stringify({ status: "connected" }));
  });

  connection.on("close", (reasonCode, description) => {
    console.log(`Connection closed: ${reasonCode} - ${description}`);
  });
});

const port = 8080;

server.listen(port, () => {
  console.log(`Server is listening on port ${port}`);
});

Backend consuming websocket and ether js

// making it work using https://ethereum.stackexchange.com/questions/112946/how-to-get-chainid-network-name-network-id-etc-in-hardhat
const { ethers} = require("ethers");
const address = "0xeEA1CaD6237Ff43ad9C9803e26f5c77AFe5A0496";
const local = "ws://localhost:8080"
const alchemy = "wss://eth-sepolia.g.alchemy.com/v2/jKOdO5By8l909tC6dqt4Y6CWqkQTLxf0"
const abi = []
const provider = new ethers.WebSocketProvider(
  local
);

provider.on("block",async(n)=>{
  const block = await provider.getBlock(n)
  console.log("block");
})

provider.on("block",async(n)=>{
  const block = await provider.getBlock(n)
  console.log("block");
})

provider.on("error",(e)=>{
  console.log(e)
})

const contract = new ethers.Contract(address, abi,provider);
contract.on("FileAdded",async(data)=>{
  console.log("received")
})

### Contract ABI

```shell
const abi = [
  {
    anonymous: false,
    inputs: [
      {
        indexed: false,
        internalType: "string",
        name: "fileIPFSID",
        type: "string",
      },
      {
        indexed: false,
        internalType: "string",
        name: "description",
        type: "string",
      },
    ],
    name: "FileAdded",
    type: "event",
  },
  {
    inputs: [
      {
        internalType: "string",
        name: "userWalletAddress",
        type: "string",
      },
      {
        internalType: "string",
        name: "fileIPFSID",
        type: "string",
      },
    ],
    name: "addFiles",
    outputs: [],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      {
        internalType: "string",
        name: "key",
        type: "string",
      },
    ],
    name: "deleteFromMap",
    outputs: [],
    stateMutability: "nonpayable",
    type: "function",
  },
  {
    inputs: [
      {
        internalType: "string",
        name: "",
        type: "string",
      },
      {
        internalType: "uint256",
        name: "",
        type: "uint256",
      },
    ],
    name: "fileAccessPermission",
    outputs: [
      {
        internalType: "string",
        name: "",
        type: "string",
      },
    ],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [
      {
        internalType: "string",
        name: "",
        type: "string",
      },
      {
        internalType: "uint256",
        name: "",
        type: "uint256",
      },
    ],
    name: "files",
    outputs: [
      {
        internalType: "string",
        name: "",
        type: "string",
      },
    ],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [
      {
        internalType: "string",
        name: "",
        type: "string",
      },
      {
        internalType: "uint256",
        name: "",
        type: "uint256",
      },
    ],
    name: "filesAccessLog",
    outputs: [
      {
        internalType: "string",
        name: "",
        type: "string",
      },
    ],
    stateMutability: "view",
    type: "function",
  },
  {
    inputs: [
      {
        internalType: "string",
        name: "userWalletAddress",
        type: "string",
      },
    ],
    name: "getFilesOfUser",
    outputs: [
      {
        internalType: "string[]",
        name: "",
        type: "string[]",
      },
    ],
    stateMutability: "view",
    type: "function",
  },
];

Errors

{
  code: 'UNKNOWN_ERROR',
  reasonCode: 'UNEXPECTED_MESSAGE',
  result: { status: 'connected' },
  shortMessage: 'received unexpected message' 
}

Environment

No response

Environment (Other)

No response

[ricmoo]

Your server is sending that back in the "request" handler. That isn’t something the Ethereum WS protocol responds with. You need to populate the response correctly; which must include a JSON-RPC response (https://www.jsonrpc.org/specification) with a result value that matches the expected response.