Simple tracker for Ethereum Network
https://ethereum-observer-api.andromeda.technology

Simple block and transaction tracker for Ethereum network.

Uses a Smart Contract to save short summary for each day.

• TypeScript,
• Koa.js,
• Database: MongoDB: Mongoose,
• Config: Dotenv, Joi,
• Testing: Jest: SuperTest, MongoDBMemoryServer,
• Docker: MongoDB.

Blockchain

• Ethereum,
• Smart Contract: Solidity,
  • only this app can write to the Contract,
  • anyone can read it's state.

Communication with the Ethereum Network

• Using ethers.js for calls to Ethereum network,
• Subscribing to events,
  • Event: block: new block is mined.

1. Clone the repo,
2. Duplicate .env.example files in [./,/docker/] to .env; modify as needed,
3. Have Docker installed, run the containers and your app (check the instructions below),
4. Add modules (routes, controllers, services, tests) to /src,
5. List newly added modules (features) here (Readme.md) and in your POSTMAN collection.

Observed data will be saved to the local database, and later - to a Smart Contract, as a daily summary.

• Start: POST [API_PREFIX]/network
• Stop: DELETE [API_PREFIX]/network

[API_PREFIX] is defined in .env; defaults to /api .

Note: Use the Postman Collection linked below.

1. Watches for block creation, stores it in the local DB,
2. For every created block: pulls all transactions and stores them in the local DB,
3. For every day that passes: storing [totalBlockAmount,totalGasAmount] in a simple Smart Contract, using Solidity.

Modules

1. Network: start/stop network observation,
2. Block,

All API routes are prefixed by API_PREFIX (defined in.env) (default: /api).

Docker

Docker provides isolated MongoDB for your project.

cd ./docker

# Duplicate example env file, modify as needed
cp .env.example .env

docker-compose up -d

Application

# Return from `docker` to root dir
# cd ..

# Duplicate example env file, modify if needed
cp .env.example .env

# Install packages
npm i

# Run
npm run dev

Using Jest Testing Framework.

Jest uses SuperTest and MongoDBMemoryServer.

npm run test

Postman Documentation

Pre-set environment variables:

• host
• admin_password

Dynamic environment variables, automatically set in tests:

• access_token

Routes can be protected with jwtCheck middleware, requiring admin rights.

Requests going to these routes require Authorization: Bearer {access_token} header.

List of protected, i.e. Admin Routes

1. Message[Create,Update,Delete],
2. [Add your protected routes here]

Getting access_token for the Admin user

• Request endpoint: POST /auth/token,
• Pass your password in the request body: { password: ADMIN_PASSWORD },
• Response will return created token.

Note: Postman collection will automatically set access_token environment variable, so you can immediately call admin routes, without copy-pasting it or setting the env variable manually.

Getting the ADMIN_PASSWORD

• Your ADMIN_PASSWORD is defined in .env file.
• It defaults to secret.

If you use MongoDB Atlas: Uncomment and fill DB_URI in .env.

Andromeda

• Medium
• Twitter

Hero image source: EthereumPrice.org.

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