Real-time Transaction Monitoring
- Listens to Ethereum mainnet transactions
- Detects large token transfers (> 1 ETH)
- Identifies NFT transfers for popular collections (BAYC, Moonbirds)
Cryptocurrency Price Alerts
- Real-time price monitoring via CoinGecko API
- Support for multiple cryptocurrencies (BTC, ETH)
- Customizable price thresholds
- Upper and lower bound price alerts
Customizable User Alerts
- Email notifications via SendGrid
- Configurable alert thresholds
- Per-wallet notification preferences
- Price alert preferences

Architecture

Core Components

Event Detection: nfts.NFTDetector for NFT transfers
Price Monitoring: services.PriceMonitor for cryptocurrency prices
Alert Services:
- services.PriceAlertService for price alerts
- services.EmailNotification for notifications
Data Storage: GORM-based PostgreSQL integration
Repository Layer:
- EventRepository for event storage
- UserPreferenceRepository for user preferences
- PriceAlertRepository for price alerts
Mock Layer:
- mock package for testing with mock implementations

Models

Event: Stores transaction details and event types
UserPreference: Manages user notification preferences
PriceAlert: Stores cryptocurrency price alert settings

Installation

Clone the repository:

 git clone https://github.com/Jetlum/WalletAlertService.git

Navigate to the project directory:
```
cd WalletAlertService
```
Install dependencies:
```
go mod download
```

Configuration

Create a config.yaml file in the root directory with the following content:

infura:
	project_id: "YOUR_INFURA_PROJECT_ID"
database:
	url: "postgresql://username:password@localhost:5432/dbname"
sendgrid:
	api_key: "YOUR_SENDGRID_API_KEY"
coingecko:
	api_key: "YOUR_COINGECKO_API_KEY"
price_check_interval: 1  # Interval in minutes for price checking

Usage

Configure the Ethereum client:
```
go run main.go
```

Configure user preferences

// Transaction alerts
userPreference := &models.UserPreference{
	UserID: "[email protected]",
	WalletAddress: "0x...",
	MinEtherValue: "1000000000000000000", // 1 ETH
	TrackNFTs: true,
	EmailNotification: true,
}

// Price alerts
priceAlert := &models.PriceAlert{
	UserID: "[email protected]",
	CryptocurrencyID: "BTC",
	ThresholdPrice: "50000.00",
	IsUpperBound: true,
	EmailNotification: true,
}

Testing

Run all tests:
```
go test ./... -v
```

Run specific tests:

go test -v ./services/... // Test notification services
go test -v ./repository/... // Test repositories

Development

Project Structure

├── config/         # Configuration management
├── database/       # Database initialization and connection
├── models/         # Data models and validation
├── nft/            # NFT detection logic
├── repository/     # Data access layer
├── services/       # Business logic and notifications
├── mock/           # Mock implementations for testing
└── main.go        # Application entry point

Key Components

NFT Detection:

Pre-configured list of popular NFT contract addresses
Extensible for adding new collections

Transaction Processing:

Real-time block monitoring
Transaction filtering and categorization
Event creation and storage

Price Monitoring:

Real-time cryptocurrency price tracking
Configurable check intervals
Support for multiple cryptocurrencies
Threshold-based alerts
Notification System

Notification System:

Email notifications via SendGrid
User preference-based filtering
Customizable notification templates
Support for both transaction and price alerts

Development

Project Structure

├── config/			# Configuration management
├── database/			# Database initialization and connection
├── models/			# Data models
├── nft/			# NFT detection logic
├── repository/			# Data access layer
├── services/			# Business logic and notifications
└── mock/			# Test mocks

Testing Environment

The project includes a robust testing setup:

Unit Tests: Testing individual components
Mock Implementations: For external services and database
Integration Tests: Testing component interactions

Set test environment:

export GO_ENV=test

Dependencies

go-ethereum: Ethereum client
sendgrid-go: Email notifications
gorm: Database ORM
viper: Configuration management
coingecko-api: CoinGecko API client