moved the code for the cefi-defi blogpost#77
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Summary of ChangesHello @joanesespanol, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request integrates foundational components for a Cefi-DeFi arbitrage strategy, as indicated by the directory structure and title. It establishes an environment variable configuration for API keys and implements core Python functions for calculating token swap outcomes on a Uniswap V2-like decentralized exchange. This sets the stage for further development or demonstration of the arbitrage strategy. Highlights
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Code Review
This pull request adds a .env file for configuration and a Python module uniswap_v2_equation_update.py containing functions for calculating Uniswap v2 swap amounts. The changes look good functionally. I've provided a few suggestions to improve code quality and maintainability. In the .env file, I've pointed out a potential typo in an environment variable name. For the Python module, I've suggested a refactoring to reduce code duplication, along with some minor improvements regarding code style and documentation to align with Python best practices.
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| #.env file | |||
| AMBER_DATA_API_SECRET_KEY_n = "<input api key here>" | |||
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The environment variable name AMBER_DATA_API_SECRET_KEY_n appears to have a typo with the _n suffix. This is unconventional and could lead to confusion. It's recommended to remove the suffix for clarity and to follow common naming conventions. Note that this change would require updating where this variable is used.
AMBER_DATA_API_SECRET_KEY = "<input api key here>"
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| #swap_amount_eth_to_usdc( eth_amountIn = 2, usdc_reserve = 102819284 , eth_reserve = 27978, fee_tier = 0.003) |
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This file has some formatting issues at the top:
- The leading blank lines on lines 1-3 are unnecessary and should be removed.
- The commented-out code on line 4 should be removed or placed inside a docstring as a usage example.
| def swap_amount_eth_to_usdc( eth_amountIn, usdc_reserve , eth_reserve , fee_tier = 0.003,): | ||
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| eth_amountInWithFee = eth_amountIn * ( 1 - fee_tier) | ||
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| numerator = eth_amountInWithFee * usdc_reserve | ||
| denominator = eth_reserve + eth_amountInWithFee | ||
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| usdc_amount_out = numerator * 1.00 / denominator | ||
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| return usdc_amount_out | ||
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| def swap_amount_usdc_to_eth( usdc_amountIn, usdc_reserve , eth_reserve, fee_tier = 0.003): | ||
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| usdc_amountInWithFee = usdc_amountIn * ( 1 - fee_tier) | ||
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| numerator = usdc_amountInWithFee * eth_reserve | ||
| denominator = usdc_reserve + usdc_amountInWithFee | ||
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| eth_amount_out = numerator * 1.00 / denominator | ||
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| return eth_amount_out No newline at end of file |
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The two functions swap_amount_eth_to_usdc and swap_amount_usdc_to_eth are nearly identical. To improve maintainability and reduce code duplication, you can refactor them into a single, more generic function. This would also resolve minor styling issues like inconsistent spacing, trailing commas, and redundant float conversion.
Here's an example of a generic function:
def get_amount_out(amount_in, reserve_in, reserve_out, fee_tier=0.003):
"""Calculates the output amount for a given input amount based on Uniswap v2 formula."""
amount_in_with_fee = amount_in * (1 - fee_tier)
numerator = amount_in_with_fee * reserve_out
denominator = reserve_in + amount_in_with_fee
return numerator / denominatorYou could then replace the existing functions with this one, or have them call this generic function.
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| eth_amount_out = numerator * 1.00 / denominator | ||
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| return eth_amount_out No newline at end of file |
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According to the PEP 8 style guide, a file should end with a single newline character.
| return eth_amount_out | |
| return eth_amount_out | |
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