Note — Deploying A Contract Via A Delegate With Truffle Set-Up


This is quite random but I had to learn a few things so worth taking note.

I was recently working on a Truffle Dapp. I had to deploy one of my contracts in a roundabout way — basically one account signing it but another paying the gas (Metatransactions are basically the same). I’d never done this before. After that I still wanted my Truffle Dapp to be able to access the deployed contract but this required a bit of a tweak. So here’s how I did it.

This was done using a simple node script and the process looks like this:

  • Unlock your ‘sender’ account and ‘delegate’ account
  • Compile the smart contract to get the bytecode
  • In this case I used Truffle to compile and accessed the bytecode from the artificat file
  • Create a transaction object with the bytecode as the call data
  • Sender signs the transaction object
  • Delegate sends the signed transaction
  • Note the receipt so you have access to the deployed contract address

I’ve included the code I used for this below.

Because the contract was deployed using the script the Truffle artificats, etc don’t have the required information so my Dapp couldn’t interact. By making a few manual changes I managed to get it to work:

  • Make sure your contract has been compiled previously using Truffle it should have an artifact file.
  • Find your Truffle artificat file for the contract. It should be of form YouContract.json and is probably under a ‘contract’ folder in your Dapps project.
  • Find the “networks” section of the artificact.
  • Add a new network entry with the following info:
  • Network ID — should be the network that you deployed to.
  • Address — The address your contract was deployed to (from the receipt)
  • TransactionHash — I don’t think this is actually required but it was handy to record it.
  • My entry is shown in the gist below.
  • That’s it! Your Dapp should now work with the deployed contract.

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