gofetch-mempool

Golang implementation of an ethereum mempool explorer. It uses the go-ethereum ethclient and gethclient packages to connect to an Ethereum node. It starts a websocket server to publish the full mempool TXs in JSON format for other clients (like a front-end) to consume.

Setup

In the project's root folder directory, you need to place a file called .env in which to put the websocket and https URLs of your ethereum node. Easiest is to rename theexample.envfile to .envand paste in your own URLs. These could for example be URLs of a node you set up via Infura.

ETH_NODE_HTTPS=<place your eth node https address here>
ETH_NODE_WS=<place your eth node websocket address here>

Running

You run main.go to start listening for mempool TXs and broadcasting them via websocket to localhost:8080/mempooltxs.

You can then hook up websocat and pipe it to jq by running websocat ws://localhost:8080/mempooltxs | jq in your terminal to verify you get output like:

[
  {
    "type": "0x0",
    "nonce": "0x67fc81",
    "gasPrice": "0x627cc9f2f",
    "maxPriorityFeePerGas": null,
    "maxFeePerGas": null,
    "gas": "0x55730",
    "value": "0x484eb851b606c00",
    "input": "0x",
    "v": "0x25",
    "r": "0x5eedb535667cf7dffdf80a3e0a2bf7db9bc39d70e7558093d79e258e24ace3cd",
    "s": "0x32f8e48146dcb12787f3d369006d7d17ba1d0639977b723e41e073a7a0e6339e",
    "to": "0x9d33eebb0bf685dcb32265e0a7a3a5ee467a9bd9",
    "hash": "0x4909e4c93a35f468d69082930fdc7cfe4251fbe5ad857d33da48f83d52619b21"
  },
  {
    "type": "0x2",
    "nonce": "0x16baa",
    "gasPrice": null,
    "maxPriorityFeePerGas": "0x3b9aca00",
    "maxFeePerGas": "0xa00d967f1",
    "gas": "0x5208",
    "value": "0x7e772d03a84258",
    "input": "0x",
    "v": "0x0",
    "r": "0x3126ae554f96b38c60f8fef6d2bdb9419bad30b6d11aa64345f417882b77b9cb",
    "s": "0x6e4a69af189a61253406cbc37d7f45d351e46f60088abcb8f246a1908c2aa1fc",
    "to": "0x57a548dce32104ee529184d7d5b11a7e56ae37a8",
    "chainId": "0x1"
  }
]