/daomoon

Primary LanguageSolidityGNU Affero General Public License v3.0AGPL-3.0

Badger Strategy V1 Brownie Mix

What you'll find here

  • Basic Solidity Smart Contract for creating your own Badger Strategy (contracts/MyStrategy.sol)

  • Interfaces for some of the most used DeFi protocols on ethereum mainnet. (interfaces)

  • Dependencies for OpenZeppelin and other libraries. (deps)

  • Sample test suite that runs on mainnet fork. (tests)

This mix is configured for use with Ganache on a forked mainnet.

Installation and Setup

  1. Use this code by clicking on Use This Template

  2. Download the code with git clone URL_FROM_GITHUB

  3. Install Brownie & Ganache-CLI, if you haven't already.

  4. Copy the .env.example file, and rename it to .env

  5. Sign up for Infura and generate an API key. Store it in the WEB3_INFURA_PROJECT_ID environment variable.

  6. Sign up for Etherscan and generate an API key. This is required for fetching source codes of the mainnet contracts we will be interacting with. Store the API key in the ETHERSCAN_TOKEN environment variable.

  7. Install the dependencies in the package

## Javascript dependencies
npm i

## Python Dependencies
pip install virtualenv
virtualenv venv
source venv/bin/activate
pip install -r requirements.txt

Basic Use

To deploy the demo Badger Strategy in a development environment:

  1. Open the Brownie console. This automatically launches Ganache on a forked mainnet.
  brownie console
  1. Run Scripts for Deployment
  brownie run deploy

Deployment will set up a Vault, Controller and deploy your strategy

  1. Run the test deployment in the console and interact with it
  brownie console
  deployed = run("deploy")

  ## Takes a minute or so
  Transaction sent: 0xa0009814d5bcd05130ad0a07a894a1add8aa3967658296303ea1f8eceac374a9
  Gas price: 0.0 gwei   Gas limit: 12000000   Nonce: 9
  UniswapV2Router02.swapExactETHForTokens confirmed - Block: 12614073   Gas used: 88626 (0.74%)

  ## Now you can interact with the contracts via the console
  >>> deployed
  {
      'controller': 0x602C71e4DAC47a042Ee7f46E0aee17F94A3bA0B6,
      'deployer': 0x66aB6D9362d4F35596279692F0251Db635165871,
      'lpComponent': 0x028171bCA77440897B824Ca71D1c56caC55b68A3,
      'rewardToken': 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9,
      'sett': 0x6951b5Bd815043E3F842c1b026b0Fa888Cc2DD85,
      'strategy': 0x9E4c14403d7d9A8A782044E86a93CAE09D7B2ac9,
      'vault': 0x6951b5Bd815043E3F842c1b026b0Fa888Cc2DD85,
      'want': 0x6B175474E89094C44Da98b954EedeAC495271d0F
  }
  >>>

  ## Deploy also uniswaps want to the deployer (accounts[0]), so you have funds to play with!
  >>> deployed.want.balanceOf(a[0])
  240545908911436022026

Adding Configuration

To ship a valid strategy, that will be evaluated to deploy on mainnet, with potentially $100M + in TVL, you need to:

  1. Add custom config in /config/__init__.py
  2. Write the Strategy Code in MyStrategy.sol
  3. Customize the StrategyResolver in /config/StrategyResolver.py so that snapshot testing can verify that operations happened correctly
  4. Write any extra test to confirm that the strategy is working properly

Add a custom want configuration

Most strategies have a:

  • want the token you want to increase the balance of
  • lpComponent the token representing how much you deposited in the yield source
  • reward the token you are farming, that you'll swap into want

Set these up in /config/__init__.py this mix will automatically be set up for testing and deploying after you do so

Implementing Strategy Logic

contracts/MyStrategy.sol is where you implement your own logic for your strategy. In particular:

  • Customize the initialize Method
  • Set a name in MyStrategy.getName()
  • Set a version in MyStrategy.version()
  • Write a way to calculate the want invested in MyStrategy.balanceOfPool()
  • Write a method that returns true if the Strategy should be tended in MyStrategy.isTendable()
  • Set a version in MyStrategy.version()
  • Invest your want tokens via Strategy._deposit().
  • Take profits and repay debt via Strategy.harvest().
  • Unwind enough of your position to payback withdrawals via Strategy._withdrawSome().
  • Unwind all of your positions via Strategy._withdrawAll().
  • Rebalance the Strategy positions via Strategy.tend().
  • Make a list of all position tokens that should be protected against movements via Strategy.protectedTokens().

Specifying checks for ordinary operations in config/StrategyResolver

In order to snapshot certain balances, we use the Snapshot manager. This class helps with verifying that ordinary procedures (deposit, withdraw, harvest), happened correctly.

See /helpers/StrategyCoreResolver.py for the base resolver that all strategies use Edit /config/StrategyResolver.py to specify and verify how an ordinary harvest should behave

StrategyResolver

  • Add Contract to check balances for in get_strategy_destinations (e.g. deposit pool, gauge, lpTokens)
  • Write confirm_harvest to verify that the harvest was profitable
  • Write confirm_tend to verify that tending will properly rebalance the strategy
  • Specify custom checks for ordinary deposits, withdrawals and calls to earn by setting up hook_after_confirm_withdraw, hook_after_confirm_deposit, hook_after_earn

Add your custom testing

Check the various tests under /tests The file /tests/test_custom is already set up for you to write custom tests there See example tests in /tests/examples All of the tests need to pass! If a test doesn't pass, you better have a great reason for it!

Testing

To run the tests:

brownie test

Debugging Failed Transactions

Use the --interactive flag to open a console immediatly after each failing test:

brownie test --interactive

Within the console, transaction data is available in the history container:

>>> history
[<Transaction '0x50f41e2a3c3f44e5d57ae294a8f872f7b97de0cb79b2a4f43cf9f2b6bac61fb4'>,
 <Transaction '0xb05a87885790b579982983e7079d811c1e269b2c678d99ecb0a3a5104a666138'>]

Examine the TransactionReceipt for the failed test to determine what went wrong. For example, to view a traceback:

>>> tx = history[-1]
>>> tx.traceback()

To view a tree map of how the transaction executed:

>>> tx.call_trace()

See the Brownie documentation for more detailed information on debugging failed transactions.

Deployment

When you are finished testing and ready to deploy to the mainnet:

  1. Import a keystore into Brownie for the account you wish to deploy from.
  2. Run scripts/deploy.py with the following command
$ brownie run deployment --network mainnet

You will be prompted to enter your keystore password, and then the contract will be deployed.

Known issues

No access to archive state errors

If you are using Ganache to fork a network, then you may have issues with the blockchain archive state every 30 minutes. This is due to your node provider (i.e. Infura) only allowing free users access to 30 minutes of archive state. To solve this, upgrade to a paid plan, or simply restart your ganache instance and redploy your contracts.

Resources