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https://github.com/afa7789/gouniswapsample
Golang get Reserves from Uniswap, simple usage of smart contract in golang.
https://github.com/afa7789/gouniswapsample
dapp ethereum example golang
Last synced: 11 days ago
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Golang get Reserves from Uniswap, simple usage of smart contract in golang.
- Host: GitHub
- URL: https://github.com/afa7789/gouniswapsample
- Owner: afa7789
- License: unlicense
- Created: 2022-05-17T17:08:23.000Z (over 2 years ago)
- Default Branch: master
- Last Pushed: 2022-06-08T14:56:20.000Z (over 2 years ago)
- Last Synced: 2024-11-23T12:30:44.695Z (2 months ago)
- Topics: dapp, ethereum, example, golang
- Language: Solidity
- Homepage:
- Size: 214 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# GGRFU - Golang get Reserves from Uniswap ( Mock swap )
This is a simple repo, trying out the GETH interface to talk to Ethereum EVM.
## Challenge
Create a simple service in Golang(preferred) or Typescript that interacts(just reads) with UniswapV2 on Ethereum.
There should be 2 inputs:
- An Ethereum address of a Uniswap V2 pair(for e.g "0xd3d2e2692501a5c9ca623199d38826e513033a17")
- An amount
The program should fetch from the chain the liquidity(reserves) of the pair's tokens and calculate(offchain) the price of the first(base/from) asset in the pool with respect to the second(quote/to), using Uniswap's formula x * y =k.
It should output a message that includes the token names of the pair along with the input/output amounts(e.g "2 ETH <-> 808.121 UNI")
__Links:__
- Pairs link: https://v2.info.uniswap.org/pairs
- You can check the pairs' ABI/contract [here](https://etherscan.io/address/0xd3d2e2692501a5c9ca623199d38826e513033a17#code). It should be identical for every pair.
- You can cross-check the final result [here](https://app.uniswap.org/#/swap?chain=mainnet).
- Some extra reading on how Uniswap V2 works: https://docs.uniswap.org/protocol/V2/concepts/protocol-overview/how-uniswap-works
__More about Uniswap:__
https://docs.uniswap.org/protocol/V2/reference/smart-contracts/pair
### Running it
#### Prerequisites
- Install [GoLang](https://golang.org/dl/)
- Install [Docker](https://www.docker.com/community-edition)
#### Setting up and running it.
```bash
git clone github.com/afa7789/GGRFU && cd GGRFU
go mod tidy
cp .env.example .env
# add your infura or other WSS to it
# run this to compile the contract
make compile
# run it
make run
```
### Output
I used this pair: __0xbb2b8038a1640196fbe3e38816f3e67cba72d940__
timestamp: 1652804597
```BASH
The Challenge
Wrapped BTC reserve: WBTC 350.2066285; token decimals:8;
Wrapped Ether reserve: WETH 5117.883978; token decimals:18;
-----
k: 179231689313875619843013296611368;
-----
Amount to simulate swap: WETH 0.0001;
new reserve0 = 35020663536;
old reserve0 = 35020662852;
amount out = 0.00000684;
```
Compare to the value in the uniswap interface at same timestamp:
## Tree
```sh
.
├── contract
│ ├── IUniswapV2Pair.sol
│ └── output # directory where the abi gen is gonna output the abi and bin of the contract.
├── go.mod
├── go.sum
├── internal
│ └── mycontract # you will not find the contract here when you download the repo, because you gotta run make compile to generate the go file
│ └── IUniswapV2Pair.go
├── LICENSE
├── main.go
├── Makefile
├── README.md
└── .env.example # copy this to add your keys.
```
UniswapModule | 0x9ac91386b4c6300d600c54882145d8eabdd1b5fd
The Contract Address 0x9ac91386b4c6300d600c54882145d8eabdd1b5fd
SushiSwapModule | 0xbf1e8e287579afad68cc82fc801c3c07b8c5ae59
CurveModule | 0xbfd0d27fb6a6d3f509143c31a390a53069760ca7
EIP173ProxyWithReceive | 0x8a71704f0f8891f92417faf840568ecee0be0918
Slingshot | 0x71727089c52efc4ad7c3fb6565c865463418d7af