feat: Migrate from ethers.js to viem

[ch4r10t33r]

Arka backend presently uses ethers.js to interact with the blockchain. We ought to be migrating all these functions to viem.

[nikhilkumar1612]

i'm working on this @ch4r10t33r

[nikhilkumar1612]

For any transactions to be made using walletClient of viem requires a field of chain. So we will have to get viem defined chain at runtime. I plan to add the following code to /utils/common.ts which will return viem defined chain using chainId. This will be used in all the functions which needs walletClient to make transactions.

import * as chains from "viem/chains"; 

export function getViemChain(chainId: number): chains.Chain {
  for(const chain of Object.values(chains)) {
    if (chain.id === chainId) {
      return chain;
    }
  }
  throw Error(`Chain with id ${chainId} not found`);
}

let me know if there are any suggestions or improvements.

[nikhilkumar1612]

what is the format of private key stored in AWS secrets manager
does it follow the viem's Hex (0x${string}) type ?

[kanthgithub]

what is the format of private key stored in AWS secrets manager does it follow the viem's Hex (0x${string}) type ?

Hi @nikhilkumar1612 yeah it follows viem's hex format

[nikhilkumar1612]

hi @kanthgithub @ch4r10t33r
i have followed the above code to obtain viem defined chain.
For PriceUpdate cronjob i cannot find the chainID, please let me know how can i proceed there.

[vignesha22]

Hi the chainId would be there on the DEPLOYED_ERC20_PAYMASTERS if you look at the structure of ERC20_PAYMASTERS on the README.md you would see that the key is the chainId and if you see inside PriceUpdate cron fn, on the first parameter of getNetworkConfig, chain is the chainId associated to each of the paymaster addresses

[nikhilkumar1612]

hey i have raised a pr please review.
@kanthgithub @vignesha22 @ch4r10t33r