Auction-Demo-Keeper

Integration example of a LIQ2.0 Keeper with atomic swap functionality

The Auction-Demo-Keeper is an integration example that demonstrates most ways to interact with the LIQ-2.0 auction system in the Maker Protocol. This "demo" keeper works out of the box, is simple in design, and leverages clipper.take's external call feature, minimizing capital requirements.

By using an exchange-callee contract, auction-demo-keeper swaps auctioned collateral for DAI using a DEX, returning DAI to the auction to cover the bid, and collecting a DAI profit from the spread - all in a single transaction. The keeper needs only ETH for gas to participate in LIQ2.0 auctions.

Scope

• It's an educational resource that'll help keeper operators transition their systems from LIQ1.2 to LIQ2.0
• Demonstrate novel, more capital efficient methods of LIQ2.0 participation
• An open source LIQ-2.0 Keeper that works out of the box

Who's it for

• Beginner Keepers - Looking for lightweight tool to begin participating in liquidations
• Experienced Keepers - Interested in incorporating LIQ2.0 in their proprietary infrastructure

Status

• As of March 23, the Auction Demo Keeper is still in active development, and is not yet fully functional.

Operation Diagram

Core Modules

keeper.js

The Keeper module is the entry point for the Auction Demo Keeper. It is responsible for initializing the clipper and constructing the different exchange contracts e.g. Uniswap, Oasis

clipper.js

The Clipper module is responsible for auction inititation. It listens for active auctions and gets the details of all active auctions. Based on the details of active auctions like collaterals remaining and auction state, the clipper executes the auction using the Transact Module.

transact.js

The Transact module handles calculation of gas costs, signing and sending of transactions. It also has a major class called GeometricGasPrice which is used to get a geometric gas price that increases geometrically with respect to time and the fixed coefficient

Installation

git clone https://github.com/makerdao/auction-demo-keeper.git
cd auction-demo-keeper
yarn install

Configuring Keeper

Setting up wallet

This keeper includes a test wallet already set up for testing purposes. You'll want to replace this with your own wallet. You may use tools such as MyCrypto.com to generate a new JSON wallet key and passphrase.

Configuring in-place

Update rpcUrl in config/mainnet.json with the URL for your own Ethereum node. Edit wallet/jsonpassword.txt with your wallet password, and copy your JSON keystore file to wallet/testwallet.json.

Configuring from environment

From your own startup script, export AUCTION_DEMO_KEEPER_CONFIG with the path to your JSON configuration file. Export AUCTION_DEMO_KEEPER_PASSWORD_PATH and AUCTION_DEMO_KEEPER_KEYSTORE_PATH with paths to the appropriate files from your keystore.

Configuration Parameters

• rpcUrl - rpcUrl stands for remote procedure call. This enables the keeper to connect to the blockchain network using the infura provider

• MakerOTCSupportMethods - This is the address of the helper contract for oasisDex

• OasisDex - This is the address of the oasis exchange contract

• UniswapV2Router - This is the address of uniswap v2 router contract

• collateral - This takes in an object for the collateral path "LINK-A" and "ETH-A"

• txnReplaceTimeout - Timeout in seconds for the transaction replacement

• delay - Delay period in seconds

• dynamicGasCoefficient - This is a value that is needed to get a geometric gas price. It's default value is 1.125 (12.5%) which is the minimum increase for Parity to replace a transaction

• maxGasPrice - Max gas price that the geometric gas price calculator uses in wei

• minProfitPercentage - Minimum percentage arbitrage profits the Keeper should execute

Addresses

kovan addresses:

UniswapV2CalleeDai: 0x5A40F810754f725DA93e2362775a0600468f7a83
UniswapV2LpTokenCalleeDai: 0xDeC8b9c2829583A89f7F182DEeD7C12112dfAeD0

mainnet addresses:

UniswapV2CalleeDai: 0x49399BB0Fcb52b32aB5A0909206BFf7B54FF80b3
UniswapV2LpTokenCalleeDai: 0x74893C37beACf205507ea794470b13DE06294220

Generate Auctions

To generate auctions on a testnet, you need to run scripts/create-auctions.js. Before you do that howver, add:

• Private key in the script file
• Acquire tokens from the FAUCET contract

Then run node scripts/create-auctions.js

How To Run

First, ensure your working directory is the root of this repository.

You may run with in-place configuration...

yarn run mainnet

...or with configuration from the environment:

yarn run env

Local Testing

1 - Run testchain script: yarn testchain 2 - In a separate shell, run JS unit tests: yarn test

Disclaimer

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