PatrickAlphaC / gcp-weather

Note: This repo is archived due to some nodes not being live anymore.

This is a repo to work with and use Chainlink smart contracts with the google weather node. If you're brand new to Chainlink, check out the beginner walkthroughs in remix to learn the basics.

You can also check out the more advanced Chainlink tutorials there as well.

• Prerequisites
• Installation
• Testnet Development
• Local Development
• Running Scripts and Deployment
• Resources
• License

Prerequisites

Please install or have installed the following:

• nodejs and npm
• python

Installation

1. Install Brownie, if you haven't already. Here is a simple way to install brownie.

python3 -m pip install --user pipx
python3 -m pipx ensurepath
# restart your terminal
pipx install eth-brownie

Or, if that doesn't work, via pip

pip install eth-brownie

2. Download the mix and install dependancies.

git clone https://github.com/PatrickAlphaC/gcp-weather
cd gcp-weather
pip install -r requirements.txt

This will open up a new Chainlink project. Or, you can clone from source:

git clone https://github.com/PatrickAlphaC/chainlink-mix
cd chainlink-mix

Testnet Development

If you want to be able to deploy to testnets, do the following.

Set your WEB3_INFURA_PROJECT_ID, and PRIVATE_KEY environment variables.

You can get a WEB3_INFURA_PROJECT_ID by getting a free trial of Infura. At the moment, it does need to be infura with brownie. If you get lost, you can follow this guide to getting a project key. You can find your PRIVATE_KEY from your ethereum wallet like metamask.

You'll also need testnet ETH and LINK. You can get LINK and ETH into your wallet by using the faucets located here. If you're new to this, watch this video.. Look at the rinkeby and kovan sections for those specific testnet faucets.

You can add your environment variables to a .env file. You can use the .env.exmple as a template, just fill in the values and rename it to '.env'. Then, uncomment the line # dotenv: .env in brownie-config.yaml

Here is what your .env should look like:

export WEB3_INFURA_PROJECT_ID=<PROJECT_ID>
export PRIVATE_KEY=<PRIVATE_KEY>

AND THEN RUN source .env TO ACTIVATE THE ENV VARIABLES (You'll need to do this everytime you open a new terminal, or learn how to set them easier)

WARNING

DO NOT SEND YOUR PRIVATE KEY WITH FUNDS IN IT ONTO GITHUB

Otherwise, you can build, test, and deploy on your local environment.

Local Development

For local testing install ganache-cli

npm install -g ganache-cli

or

yarn add global ganache-cli

All the scripts are designed to work locally or on a testnet. You can add a ganache-cli or ganache UI chain like so:

brownie networks add Ethereum ganache host=http://localhost:8545 chainid=1337

And update the brownie config accordingly. There is a deploy_mocks script that will launch and deploy mock Oracles, VRFCoordinators, Link Tokens, and Price Feeds on a Local Blockchain.

Running Scripts and Deployment

brownie run scripts/deploy.py --network kovan

Resources

To get started with Brownie:

• Chainlink Documentation
• Check out the Chainlink documentation to get started from any level of smart contract engineering.
• Check out the other Brownie mixes that can be used as a starting point for your own contracts. They also provide example code to help you get started.
• "Getting Started with Brownie" is a good tutorial to help you familiarize yourself with Brownie.
• For more in-depth information, read the Brownie documentation.

Any questions? Join our Discord

License

This project is licensed under the MIT license.