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dOracle

Ethereum based oracle

Installing

After cloning this repository and installing the above dependencies, perform with $

  1. Use the proper node version, if you don't have lts/dubnium install it
nvm alias default lts/dubnium
nvm use default
  1. Install truffle and ganche globally in your system:
npm uninstall -g truffle
npm install -g truffle  
truffle -version  
npm install -g ganache-cli
ganache-cli --version

Output: Truffle v5.4.3 - a development framework for Ethereum Ganache CLI v6.12.2 (ganache-core: 2.13.2)

  1. Execute ganche ganache-cli -a 3 -d -m "stomach wage stem judge control beauty glue chapter cannon kitchen pilot orbit"

  2. Compile the local version in a new terminal which will deploy the contract onto your local ethereum blockchain. if you deploy to the testnet do truffle migrate --network ropsten, see truffle.js

nvm use default
cd on-chain-oracle
yarn install
truffle compile
truffle migrate
  1. Compile the off-chain code in a new terminal
nvm use default
cd ./off-chain-oracle
yarn install
  1. Configure the .env RPC_URL=https://ropsten.infura.io/v3/4ef4ffec11664228a7589dd79511eb04 // Your infura project, to track requests CHAIN_ID=3 // 3 means ropsten testnet

CONTRACT_ADDRESS=0xea530407DBfaC81DDdCecAde863DD1D290f06Dac // After you deploy the contract with truffle migrate you copy that address here ABI=[{...}] // in one line copy paste the ABI key of the Oracle.json in 1 line, I used: https://tools.knowledgewalls.com/online-multiline-to-single-line-converter

TIMEOUT=10000 // to not bombard the logs and see something...

MNEMONIC=trend garlic surround program impulse text address arctic account other faculty total // This is the seed phrase of your METAMASK account done in ropsten ACCOUNT_NUMBER=0 // You can run multiple oracles but with 1 it's ok here

URL_TO_QUERY=https://api.coingecko.com/api/v3/simple/price?ids=dopple-finance&vs_currencies=usd // url you want to gather a JSON ATTRIBUTE_TO_FETCH=dopple-finance.usd // which key.value you want to get

  1. Run the off-chain test
yarn run develop