ETH Smart Contract Monitoring Framework (ETHMonitor SDK)

Overview

ETHMonitor is a comprehensive framework for monitoring multiple Ethereum smart contracts. It provides unified encapsulation for smart contract listening and offers handler support for customized business operations.

Key Features

• Customizable business handlers: Implement your own logic for processing transactions
• Multi-contract monitoring: Simultaneously track multiple smart contracts
• Complete transaction analysis: Parses standard attributes like transaction status, gas consumption, and contract parameters
• Flexible integration: Easy to implement with existing systems and middleware

Core Architecture

The framework follows a streamlined process for efficient contract monitoring:

1. Address Filtering: Determines whether transaction to addresses require monitoring
2. Business Processing: Handles qualified transactions with parsed attributes (status, gas, parameters)
3. Height Management: Maintains block height persistence for service continuity
4. Block Completion: Triggers post-processing after each block analysis

Implementation Guide

// Implementing TxHandler interface
var _ ethmonitor.TxHandler = &Mock{}
type Mock struct {
}

// Persist block height
func (m *Mock) SaveHeight(ctx context.Context, height *ethmonitor.BlockHeight) error {
    // Save scanned block height to preferred middleware
    return nil
}

// Initialize monitoring height on startup
func (m *Mock) LoadLastHeight(ctx context.Context) (*ethmonitor.BlockHeight, error) {
    // Retrieve block height from preferred middleware
    return big.NewInt(1), nil
}

// Business logic implementation
func (m *Mock) Do(ctx context.Context, info *ethmonitor.TxInfo) {
    // Your custom transaction handling logic
}

// Contract address verification
func (m *Mock) ContainContact(ctx context.Context, address ethmonitor.ContractAddress) bool {
    return true
}

func main() {
    opt := &ethmonitor.Options{
        RpcUrl: "http://localhost:8545",
        AbiStr: `[{"type":"function","name":"send","inputs":[{"name":"amount","type":"uint256"}]}]`,
        Handler: &Mock{},
    }
    monitor, err := ethmonitor.New(opt)
    if err != nil {
        panic(err)
    }
    monitor.Run()
}

Smart Contract Operations

// Action represents smart contract methods
type Action struct {
    Method string               // Contract method name
    Inputs map[string]interface{} // Contract parameters and values
}

// Example value parsing from contract parameters
var act = &Action{
    Method: "send",
    Inputs: map[string]interface{}{"amount": big.NewInt(250)},
}

amount, ok := act.Inputs["amount"].(*big.Int)
if ok {
    fmt.Println(amount.String())
}

Security Considerations

When working with private Ethereum chains:

• Avoid exposing private chains to public networks
• Implement IP restrictions for stable development environments
• Regularly update security measures

👉 Learn more about blockchain security best practices

Frequently Asked Questions

What makes ETHMonitor different from other monitoring solutions?

ETHMonitor provides a specialized framework specifically designed for Ethereum smart contract monitoring with customizable handlers and multi-contract support.

How does the framework handle network disruptions?

ETHMonitor maintains persistent block height tracking, allowing it to resume monitoring from the last processed block after any interruption.

Can I use this with existing database systems?

Yes, the framework is middleware-agnostic, allowing integration with your preferred database systems through the handler implementation.

What Ethereum networks are supported?

ETHMonitor works with any Ethereum-compatible network including mainnet, testnets, and private chains.

How resource-intensive is the monitoring process?

The framework is optimized for efficiency, with processing overhead primarily dependent on your custom handler implementations.

👉 Discover advanced Ethereum monitoring techniques

Maintenance and Support

For assistance with implementation or to contribute to the project:

• Join our developer community
• Report issues through GitHub
• Participate in framework improvement discussions

Note: The framework is actively maintained with regular updates and security patches.

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