Gas Snap

A MetaMask snap for sending Celo transactions with alternate gas currencies

Usage

Connect to the Snap

To interact with this Snap, you will need to install MetaMask Flask, a canary distribution for developers that provides access to upcoming features.

Then use Snap ID to connect to this Snap:

const snapId = 'npm:@celo/gas-snap';

async function connect() {
  let requestParams = {};
  requestParams[snapId] = {};
  const result = await ethereum.request({
    method: 'wallet_requestSnaps',
    params: requestParams,
  });

  if (result) {
    // user is now connected
    console.log("connected")
  }
}
  

Simple Transfer Example

Once connected, you can call the RPC method exposed in this snap as follows:

 import { CeloTransactionRequest } from '@celo-tools/celo-ethers-wrapper';

 const tx: CeloTransactionRequest = {
        to: <address>,
        value: ethers.utils.parseUnits("1", "wei")
    }
 const result = await ethereum.request({
  method: 'wallet_invokeSnap',
  params: {
    snapId: snapId,
    request: {
      method: 'celo_sendTransaction',
      params: {
          tx
      }
    },
  },
});

console.log(result);
  

MetaMask will automatically fetch the Snap from the npm registry.

Please refer to the documentation for more about the parameters field https://docs.metamask.io/snaps/reference/rpc-api/#example-1

More Generic Transaction Example

This example shows how one can use the snap to send a more generic transaction.

  import { CeloTransactionRequest } from '@celo-tools/celo-ethers-wrapper';

  const abi = ['function deposit() external payable']
  const iface = new ethers.utils.Interface(abi)
  const data = iface.encodeFunctionData("deposit")

  let tx: CeloTransactionRequest = {
      from: <wallet_address>,
      to: <destination_contract_address>,
      data
      value: ethers.utils.parseUnits("1", "wei")
  }

  const result = await ethereum.request({
    method: 'wallet_invokeSnap',
    params: {
      snapId: snapId,
      request: {
        method: 'celo_sendTransaction',
        params: {
            tx
        }
      },
    },
  });
  

Publishing a new version of the Snap.

In other to update the snap to publish a new change, Update the version tag in both packages/snap/snap.config.js and packages/snap/pakcage.json to the same. Then from you console run the following commands.

Note: You must be logged into NPM on your terminal as well as added to the celo organization on npm.

cd packages/snap

npm publish --access public

Register a new coin type.

To Register a new coin type, add a new entry snap_getBip44Entropy with the desired coin type. See list for reference. https://github.com/satoshilabs/slips/blob/master/slip-0044.md