0g-demo-app

This repo is to demonstrate a simple application that is built on top of 0G network. This example involves three parts: contract, server, client

• A contract is responsible for recording the authority of clients (whether they are registered)
• A server is checking the authority of the request from a client and allows for file upload/download if it's registered
• A client should first interact with the contract to register himself and then upload/download files to the service provider (server).

1. Deploy a contract on 0G chain.

In order to run, execute the following to install dependencies

cd server
npm install --save-dev hardhat
npm install

Then run the following code to compile the contract

npx hardhat compile

Before deploying, setup the environment variable with your own private key by creating a .env file and put

PRIVATE_KEY=<your_private_key>

Finally, run the deploy script to deploy the contract

npx run scripts/deploy.js --network zg

Record the deployed contract address.

2. Compile and run the server

go mod tidy
go build

Add the following field to the .env file

CONTRACT_ADDRESS=<deployed_contract_address>

then start service

./server

3. Run the client to register onchain

cd client
go mod tidy
go run main.go

You will receive a tx hash which is the transaction to set the key on chain.

4. Access the server and upload/download files

Run the following to upload the file

curl -X POST -F 'key=<your_key_in_client>' 'http://localhost:3333/upload'

And use the following to download the file. The data root can be found in the console when you upload the file.

curl -v -X POST -H 'Content-Type: application/json' -d '{"key":"<your_key_in_client>","root":"<data_root>"}'  'http://localhost:3333/download'

Refer to this documentation on how to generate .go code from .sol code.