https://github.com/rogercoll/ethoracle
Testing Ethereum oracles
https://github.com/rogercoll/ethoracle
ethers oracle-contract oracle-functions sol usd
Last synced: 7 months ago
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Testing Ethereum oracles
- Host: GitHub
- URL: https://github.com/rogercoll/ethoracle
- Owner: rogercoll
- Created: 2021-01-09T15:43:45.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2021-01-18T07:46:06.000Z (over 4 years ago)
- Last Synced: 2025-03-20T14:52:48.076Z (7 months ago)
- Topics: ethers, oracle-contract, oracle-functions, sol, usd
- Language: JavaScript
- Homepage:
- Size: 38.1 KB
- Stars: 1
- Watchers: 2
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Final BCK work
In order to understand more how Oracle functions work I tried to implement a basic one that return the value of one ETH in USD.
Currently, it only returns an integer number.
##TODO
- Return float with decimals
- USDT instead of USD.
## Contracts
- AggregatorInterface.sol => Interface for returning an answer
- OracleETHUSDT.sol => Contract implementation of the Aggregator interface
- ValueInUSDT.sol => This can be any contract that for some reason wants to know the value of ETH/USD. It will use as Oracle function the contract address you set in the deployment. In this case it will use the already deployed OracleETHUSDT.sol. With this basic examples you can provide an amount of ethers to the `inUSDT(int 256 eths)` function and it will return the value in usd.
### Deployments in Rinkeby network
- Oracle contract(OracleETHUSDT.sol): 0x5f7471A049b94f5703B3293D5866b9b42f0Bed77
- Test example(ValueInUSDT.sol): 0x899a9b225F5e965a96693c82D83856170BBF10f3
## Oracle update
The main idea is to keep updating the price value of the Oracle contract. In order to do that I set a raspberry that runs the script `updatePrice.js` every 30 minutes. This script gets the acutal value of ETH/USD using the CoinGecko API.
Crontab of raspberry pi:
```
*/30 * * * * /usr/bin/node /home/pi/blockchain/ethoracle/scripts/updateOracle.js > /dev/null
```
## Scripts
- upateOracle.js => update the value ETH/USD of the Oracle contract with the actual value got from CoinGecko api. It exits after 3 block confirmations. (private key to update the contract removed)
- howmanyusd.js => get the value of usd of x ethers. (node howmanyusd.js 3) //will return how much is worth 3 ethers in usd