Create a solver
Requirements
Creating a solver requires knowledge of:
- Programming
- Optimization algorithms; or
- An easy route / path that is not yet used by the existing solvers
For the example below, we will use:
- Rust as the programming language
- Knowledge of a route that is not yet used by the existing solvers
Idea
Let us consider the case of Yearn tokens. A user has USDC and wants to buy yvUSDC. If no solver understands how to deposit into a Yearn vault, all solutions from solvers will require an LP USDC/yvUSDC to settle the order. But we know how to deposit into a Yearn vault, so we can create a solver that understands how to do that.
CoW Protocol infrastructure is a lot of services running together in herd harmony, which is a bit intimidating at the beginning. Before proceeding, it would be advisable to read the architectural overview to get a better understanding of how CoW Protocol works and its entities.
Setup
It is assumed you have Rust setup correctly with rustup.
solve() which receives the batch orders and returns a SettledBatchAuctionModel aka a solution.
To run, exec:
Once the service is running you can start throwing jsons at it.
I started reading the code and playing with different json setups calling:
curl -vX POST "http://127.0.0.1:8000/solve" \
-H "accept: application/json" \
-H "Content-Type: application/json" \
--data "@/Users/user/dev/cow-dex-solver/sample.json"
My solver code
I forked cow-dex-solver and wrote my first lines of rust.
You can check out my solver’s code at:
https://github.com/poolpitako/cow-dex-solver/pull/1
References
