A simple Voting Smart Contract

Test Steps

0.Ganache Installation

Install the Ganache and then open it, it will help you to create a local blockchain environment with some test nodes.

1.Compile Contract

Go to the Remix IDE (https://remix.ethereum.org/) and compile the vote.sol

2.Deploy Contract

Change the Remix IDE environment to Web3 Provider and enter the Ganache default server address:HTTP://127.0.0.1:7545, then you can find that the account addresses listed on Remix page correspond to the nodes in your Ganache local environment.

Next you can choose the first account in the list(which will then be the constructor of the contract, who has the right to assign vote to voters) to deploy the smart contract(need to pass the parameter---optionNames. For example,["a","b","c"]).

Of course you can also select another account you prefer, but then you need to change the constructor address in ass_vote.py accordingly(16th line of ass_vote.py). For example you pick the 2nd account as your constructor,then you need to change the w3.eth.accounts[0] to w3.eth.accounts[1].

3.Obtain the address of deployed contract

Copy the address of the contract you just deployed(can be found in 'Deployed Contracts' on Remix)

4.Assign Votes&Run App

Then you can run the flask app by entering following statements in your terminal:
python3 flask_app.py 'addr'
Here the addr is the address you copied in step 3.

5.Vote via browser

For those accounts which are assigned votes(accounts can be found either in Ganache or on Remix), they can login and vote via browser.