bridge_proposal.ts

// example of adding an owner to the mainnet safe via a proposal on the sidechain

  const safeKovan = new ethers.Contract(
    KOVAN_SAFE_ADDRESS,
    GnosisSafeL2.abi,
    deployer
  )
  const safeSokol = new ethers.Contract(
    SOKOL_SAFE_ADDRESS,
    GnosisSafeL2.abi,
    deployer
  )
  const usulSokol = new ethers.Contract(
    SOKOL_USUL_ADDRESS,
    Usul.abi,
    deployer
  )
  const AMBSokol = new ethers.Contract(
    _amb_ADDRESS,
    AMB.abi,
    deployer
  )
  const bridgeKovan = new ethers.Contract(
    KOVAN_BRIDGE,
    AMB.abi,
    deployer
  )

  // generate the call selected in the action of the proposal (one at a time for now, we 
  // need to use multisend to achieve multiple calls in one bridge
  const addCall = buildContractCall(
    safeKovan,
    "addOwnerWithThreshold",
    [NEW_ADMIN_ACCOUNT, 1],
    0
  );
  
  // generate the call to the mainnet bridge module that will happend after bridging, this forwards
  // the addOwner tx to the gnosis safe on mainnet
  const bridgeCall = buildContractCall(
    bridgeKovan,
    "executeTransaction", // this method on the bridge module forwards the call to the mainnet safe
    // see the method here https://github.com/gnosis/zodiac-module-bridge/blob/main/contracts/AMBModule.sol#L118
    [safeKovan.address, 0, addCall.data, 0], // to address will always be the mainnet safe
    0
  );

  // store ambCall.data, this will be used to generate the proposal call data on the sidechain Usul
  const ambCall = buildContractCall(
    AMBSokol,
    "requireToPassMessage",
    [bridgeKovan.address, bridgeCall.data, 1000000],
    0
  );

  console.log(ambCall.data)

  // Create proposal on sidechain usul
  const txHash = await usul.getTransactionHash(
    AMBSokol.address, // the target of the proposal call
    0,
    ambCall.data, // we will execute the call to the amb that wraps the call on mainnet
    0
  );

  // submit the propsal to sidechain usul as normal
  const tx = await usul.submitProposal([txHash], linear.address, "0x", {gasPrice: 20000000000});

  // now vote on the propsal as usual, but on the sidechain
  const tx = await linear.vote(proposalId, 1, {gasPrice: 20000000000})
  await tx.wait()
  // waiting for voting period to end  
  await sleep(120000);

  // finalize the strat, here get the transaction hash from tx2 object, i forget what the key is for it
  const tx2 = await linear.finalizeStrategy(proposalId, {gasPrice: 20000000000});
  // prompt user to submit tx2 hash at the AMB website https://alm-test-amb.herokuapp.com/