This repository is the start of an RPC provider for DIN.

This plugin is intended to work in tandem with a separate middleware plugin that takes care of routing to specific services. This plugin should have a traefik config that looks something like:

providers:
  plugin:
    rpcrouter:
      providers:
        - url: https://provider1/
          wsurl: wss://provider1/ws
          methods:
            - eth_chainId
            - eth_blockNumber
        - url: https://provider2/
          wsurl: wss://provider2/ws
          methods:
            - eth_chainId
            - eth_getBlockByNumber
      methods:
        - Name: eth_chainId
        - Name: eth_blockNumber
        - Name: eth_getBlockByNumber

In this case, calls to eth_chainid might be routed to either provider, calls to eth_blockNumber will go to provider1, and calls to eth_getBlockByNumber will go to provider2.

Block number awareness can be provided by the separate agent in the /agent directory. Running

go run agent/main.go https://traefikhost:7777

will connect the agent to the traefik plugin. The agent will retrieve information about each provider's websocket endpoint from the plugin, subscribe via websockets, and make calls to the traefik plugin to notify it of block updates. Traffic will only be served to providers with the latest block number available.

In the future we may try to incorporate the agent back into the plugin, but at the moment establishing websocket connections via Yaegi is proving difficult.