Question concerning anvil, docker and websockets

[arondius]

Hi guys :)

Hope you can help met out.

Question concerning anvil, docker and websockets:

I have a docker compose project:

version: '3.8'

services:

  anvil:
    image: ghcr.io/foundry-rs/foundry:latest
    env_file:
      - .env
    environment:
      - ANVIL_FORK_URL=${ANVIL_FORK_URL}
    ports:
      - 8545:8545
    container_name: anvil
    entrypoint: anvil -f $ANVIL_FORK_URL --host 0.0.0.0

  src:
    build:
      context: .
      dockerfile: ./Dockerfile
    container_name: src_container

The src container is a Typescript node app with EthersJs to set up a websocket provider. When running agains mainnet the app can succesfully subscribe to websocket events.

When using the Anvil local fork, it can connect to anvil through the ws://anvil:8545 docker container, I can see the connection in the anvil container logs.
However there is no subscription data coming in to my app

Going into the src container and doing a

> {"id":1,"jsonrpc":"2.0","method":"eth_subscribe","params":["newHeads"]}
< {"jsonrpc":"2.0","id":1,"result":"0x5536365230446d756177526b31727479"}

The above results in only one piece of data, not a stream of data

What am i missing?

[stevekeol]

Is there anybody help this issue?

[L8D]

I'm seeing the same behavior when trying to use Ethers.js with Anvil over websockets. It appears that this issue also happens with Hardhat Node and Ganache as well. Very strange.

[zerosnacks]

Forking in Anvil means you take a snapshot of the state at a certain blockheight (usually latest). Any transactions that then come in or advancements on the parent chain are not reflected in your fork. After forking you can either send transactions to create blocks or use interval mining like: anvil --fork-url <FORK_URL> --block-time 1

[L8D]

This is a bug that occurs even when the --fork-url option is omitted. The problem is that the subscription is not being updated with any data from the local chain.

[zerosnacks]

Would you mind opening an issue for this with reproducible steps and an accurate description?