Southeast-Nacos

A Rust library for retrieving configuration from Alibaba Nacos with AWS KMS integration for secure password handling.

Features

• Fetch configuration from Nacos server with robust error handling

• Automatic decryption of passwords encrypted with AWS KMS

• Strong type conversion with serde for type-safe configuration

• MD5 validation of received configuration

• Comprehensive error types for better debugging

Installation

Add this to your Cargo.toml:

[dependencies]
southeast-nacos = "0.1.0"

Usage

use southeast_nacos::from_nacos;
use serde::Deserialize;

#[derive(Debug, Deserialize)]
struct MyConfig {
    database_url: String,
    api_key: String,
    timeout_seconds: u64,
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Set required environment variables before using
    std::env::set_var("NACOS_ADDR", "nacos-server:8848");
    std::env::set_var("NACOS_GROUP", "DEFAULT_GROUP");
    std::env::set_var("NACOS_NAMESPACE", "public");
    std::env::set_var("NACOS_USERNAME", "nacos");
    std::env::set_var("NACOS_PASSWORD", "nacos");
    std::env::set_var("NACOS_DATA_ID", "my-application");
    
    // Fetch and deserialize configuration
    let config: MyConfig = from_nacos().await?;
    
    println!("Database URL: {}", config.database_url);
    println!("API Key: {}", config.api_key);
    println!("Timeout: {} seconds", config.timeout_seconds);
    
    Ok(())
}

Required Environment Variables

The library requires the following environment variables to be set:

Password Encryption

For enhanced security, passwords can be encrypted using AWS KMS. To use an encrypted password, format it as:

ENC(base64-encoded-encrypted-content)

The library will automatically detect this format and decrypt the password using the AWS KMS key specified in the KMS_KEY_ID environment variable.

AWS KMS Integration

This library uses the AWS KMS service in the ap-southeast-1 region by default. The encrypted content should be base64-encoded using standard encoding. If you encounter issues with decoding, you might need to modify the get_blob function to use URL_SAFE encoding instead.

Error Handling

The library provides detailed error types through the NacosError enum, which helps diagnose issues with:

• Missing environment variables

• Nacos connection problems

• Configuration retrieval errors

• KMS decryption issues

• JSON parsing errors

• Base64 decoding failures

• UTF-8 conversion issues

License

MIT