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Contributing to Zkopru👋

Thanks for taking a time to read this document. This document includes how to contribute to the project including testing and commits.

Table of Content

Security vulnerability

After the mainnet stage, you should not open up issues on Github to report bugs that can affect the network's security. Mostly, it will be the case when you find some bugs in packages/contracts or packages/circuits. In this case, please report the bug via [email protected] instead of opening a public issue on Github.

Commit rule

This project follows the conventional commit rule. To check the full specification, please see https://www.conventionalcommits.org/ Here is the sample commits.

  1. Commit message with description and breaking change footer

    feat: allow provided config object to extend other configs

BREAKING CHANGE: `extends` key in config file is now used for extending other config files

  2. Commit message with ! to draw attention to breaking change

    refactor!: drop support for Node 6

  3. Commit message with both ! and BREAKING CHANGE footer

    refactor!: drop support for Node 6

BREAKING CHANGE: refactor to use JavaScript features not available in Node 6.

  4. Commit message with no body

    docs: correct spelling of CHANGELOG

  5. Commit message with scope

    feat(lang): add polish language

  6. Commit message with multi-paragraph body and multiple footers

    fix: correct minor typos in code

see the issue for details

on typos fixed.

Reviewed-by: Z
Refs #133

Style guide

This uses airbnb eslint, and husky will automatically prettify using commit-hook.

Development

Prerequisites

  1. You need docker & docker-compose for integration test

  2. Set your node version v12. It currently supports Node v12.

    • Get nvm here

    • Download node version 12 and set to use it.

      nvm install 12
nvm use 12

      If you want to make node 12 as the default option run && yarn build:keys

      nvm alias default 12

  3. Install yarn globally. You can skip this step if you already have yarn.

    npm install -g yarn

Build

  1. Install & get initial setup for the project

    yarn bootstrap

  2. Build packages

    yarn build

  3. Run development env

    yarn develop

    This command will run the coordinator & cli wallet using docker and you can easily access to the running programs via web browser.

    Or you can setup the environment without docker-compose. Please check "Manually setup Run cli applications" section.

Integrated test

yarn test

If you have not enough cpu core, please use

yarn test:serial

Or you can test specific package by just going into the sub package and running yarn test there.

Manually setup Run cli applications

  1. Prepare three terminals

  2. Run ganache and deploy contract using the following command.

    docker-compose up --build testnet

  3. Go to cli package and run coordinator with a pre-configured test account.

    cd packages/cli && yarn dev:coordinator

    This will give you a cli menu to operate coordinator locally.

  4. Go to the cli package and run wallet with a pre-configured test account.

    cd packages/cli && yarn dev:wallet

    This will give you a cli menu to run wallet locally.

  5. It stores the dev log in packages/cli/WALLET_LOG and packages/cli/COORDINATOR_LOG. You can beautify the logs using this command.

    npm install -g pino-pretty
tail -f packages/cli/WALLET_LOG | pino-pretty
tail -f packages/cli/COORDINATOR_LOG | pino-pretty

Circuit, contract changes and its test

Currently, Zkopru is using prebuilt docker images for local testing to reduce the SNARK circuit building time consumption. Therefore, if you're trying to make any changes on smart contract or circuits you need to follow this steps.

  1. Go to compose/docker-compose.yml.
  2. Modify the tag of the service what you want to make some modifications. Tag name convention is the branch name with issue number just like feat-6, refactor-913.
  3. And then run yarn images build <service_name> on the root directory. If you make changes on the 'circuit' image, this command will take about a day on common laptops.
  4. After you built the image, run yarn test in the sub package directory or in the root directory.

How to make changes of the circuit package

  1. Add a test circuit in the directory packages/circuits/tester/

  2. Write testcase in the directory packages/circuits/tests

  3. Run test command

    lerna run test --scope=@zkopru/circuits

    or

    cd packages/circuits
yarn test

  4. After the testing, build a docker image to use the compiled circuit and keys

    # root directory of the project
yarn images build
# Or you can build only the zkoprunet/circuits image with this command
yarn images build circuits

How to make changes of the circuit package.

  1. Add a test circuit in the directory packages/circuits/tester/
  2. Build a docker image for testing the circuit
# root directory of the project
make circuit-testing-container
  1. Write testcase in the directory packages/circuits/tests
  2. Run test command
lerna run test --scope=@zkopru/circuits

or

cd packages/circuits
yarn test
  1. After the testing, build a docker image to use the compiled circuit and keys
# root directory of the project
make circuit-container

This command will compile and setup circuits in the impls directory.

  1. Tag the docker image and push to the docker hub.

  2. (Optional) Specify the docker image tag in the test cases.

    This command will compile and setup circuits in the impls directory.

  3. (maintainer only) Update dockerifles/docker-compose.yml to modify tag and run following:

    yarn images build
docker-compose -f compose/docker-compose.yml push

How to make changes of the prisma package

  1. Because prisma currently not support multi source gracefully, we have to update the following scheme at once
    • packages/prisma/prisma/base.prisma
    • packages/prisma/prisma/postgres.prisma
    • packages/prisma/prisma/sqlite.prisma
    • packages/prisma/prisma/postgres-migrator.prisma
    • packages/prisma/prisma/sqlite-migrator.prisma
  2. Then run yarn build:prisma. This will update the prisma client typescript and the mockup sqlite db file.
  3. To save the changes, run yarn save:prisma.
  4. (optional) If you want to create a migration file for postgres manually, run cd packages/prisma && yarn gen-migration:postgres. You may have to run this command before running the integration test.
  5. (optional) Migration may cause some problems, sometimes you need to clean up the packages/prisma/prisma/migrations directory.
  6. (optional) To commit the change, clean up and squash the recent migrations into a single migration. And then, force stage the migration using git add packages/prisma/prisma/migrations --force.

Explore database

You can open the Prisma Studio to explore the database with following steps:

  1. Create packages/prisma/prisma/.env

  2. Write up the database connection information.

    • for dev coordinator

      # file packages/prisma/prisma/.env
DATABASE_URL="file:../../cli/zkopru-coordinator.db"

    • for dev wallet

      # file packages/prisma/prisma/.env
DATABASE_URL="file:../../cli/zkopru-wallet.db"

  3. Run yarn studio

    cd packages/prisma && yarn studio

Update database schema

  1. Modify packages/prisma/prisma/schema.prisma

  2. Run the following command will update the typescript automatically.

    yarn build:prisma

  3. Update mockup database.

    yarn save:prisma

Optional commands

Fresh build

yarn build:fresh

Build only typescript (will save your time)

yarn build:ts

This command will re-build the whole packages by wiping away every artifacts.

Setting up new snark keys

yarn build:keys

Packages

account

This module contains HD Wallet that manages zk accounts which supports both the Babyjubjub EdDSA and Ethereum.

babyjubjub

This modules contains basic crypto classes for the babyjubjub elliptic curve to integrate its third pary libraries into the zkopru project.

circuits

This library contains zk SNARK circuits written in Circom DSL.

cli

Cli applications. Wallet and coordinator node.

contracts

This library contains the smart contract which runs the upstream layer 1 part of the system. This library is written in solidity.

coordinator

This is an application package for the coordinator. It synchonizes, verifies, and generates blocks with its full-node feature.

core

The core layer2 blockchain system which supports both the full node and the light node. Using this package, you can develop a new application such as mobile wallets or payment solutions.

dataset

This module generates dataset for test cases. To avoid the recursive dependency graph, only the test cases refer this package using symbolic links.

integration-test

This module is the integration test set to run the local testnet for development.

prisma

database layer.

transaction

This modules contains the transaction builder.

tree

This package contains a light weight roll up tree for zkopru system. Especially the light sync mode allows running the system with a very tiny size of tree data (~30 MB).

utils

This package contains miscellaneous tools for zkopru project.

zk-wizard

It contains a zk-wizard which creates a zk-SNARK proof for raw transactions and zk-wallet that manages the accounts and UTXOs.