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I want to extract main net state at a specific block number using geth or parity. Then using the extracted state I want to interact with contracts deployed during that time using ethers js.

Can someone please point me to the easiest way to achieve that?

  • Can point you with Ganache. – goodvibration Nov 13 '20 at 10:23
  • @goodvibration Sure! That would be great! – Mustafa Khan Nov 13 '20 at 10:27
  • Are you on Truffle 5.x? – goodvibration Nov 13 '20 at 10:31
  • @goodvibration Yep! – Mustafa Khan Nov 13 '20 at 10:33
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Here is how you can do it using Truffle & Ganache.

In truffle-config.js, extend the configuration of your network to something like this:

networks: {
    myNetwork: {
        host: ...,
        port: ...,
        network_id: ...,
        gas: ...,
        gasPrice: ...,
        networkCheckTimeout: 9000000000, // or some other large value
        provider: ganache.provider({
            gasLimit: ...,
            gasPrice: ...,
            default_balance_ether: ...,
            fork: "url of an archive node",
            fork_block_number: desiredBlockNumber
        })
    }
}

Update: you also need const ganache = require('ganache-core'); in this file.

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