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Is there a way to filter ethereum json-rpc methods to only allow read calls, not writing? ie, filter out sendTransaction, sendRawTransaction, create, etc

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  • One option would be to write some middleware that sits in front of your node.
    – JoshOrndorff
    Commented Mar 7, 2022 at 17:07

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If you want to do it inside the node, you will need to override some of frontiers RPC handlers. For example, you can see the EthApi implementation here:https://github.com/paritytech/frontier/blob/master/client/rpc/src/eth.rs. You could proceed in either of two ways:

  1. Copy this code and change some methods eg sendRawTransaction to behave as you like.
  2. Write your own struct that wraps the one I linked. For methods you want to enable, you can call into the wrapped original. And for methods you want to block, you can just return immediately with no action or error.
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  • Thanks @JoshOrndorff. I think that the correct way to achieve what I want is to use a middleware as you suggested, because I only want some nodes to be read-only. In this case it's infeasible to use different implementations for each type of node. Maybe in the future we could have cli options to directly filter the methods.
    – afm
    Commented Mar 7, 2022 at 20:43

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