# AWS System Manager - Parameter Store for NestJS

The **AWS System Manager - Parameter Store for NestJS** is a module that provides integration between the NestJS framework and the AWS Systems Manager Parameter Store. This module allows you to easily fetch and manage configuration parameters stored in the AWS Parameter Store within your NestJS application.

## Features

- Fetch configuration parameters from AWS Parameter Store.
- Cache parameter values for improved performance.
- Automatically reload parameter values when they are updated in the Parameter Store.
- Supports both hierarchical and flat parameter structures.
- Provides a simple and intuitive API for accessing parameters.
- Compatible with NestJS 8, 9, 10, and 11.

## Installation

You can install the module using npm or yarn:

```bash
npm install @xmotion/aws-ssm-param-nestjs
```

or

```bash
yarn add @xmotion/aws-ssm-param-nestjs
```

## Requirements

- Node.js 18 or newer
- NestJS 8.x, 9.x, 10.x, or 11.x
- AWS SDK v3

## Usage

To use the module, follow these steps:

1. Import the `AWSSSMParamsModule` into your NestJS application module:

### Static configuration

```typescript
import { Module } from '@nestjs/common';
import { AWSSSMParamsModule } from '@xmotion/aws-ssm-param-nestjs';

@Module({
  imports: [
    AWSSSMParamsModule.register({
      ssmParamStorePath: '/prod/dbname',
      ssmDecryptParams: true,
      ssmClientOptions: {
        region: 'ap-southeast-1',
      },
    }),
  ],
})
export class AppModule {}
```

### Async configuration

```typescript
import { Module } from '@nestjs/common';
import { ConfigModule, ConfigService } from '@nestjs/config';
import { AWSSSMParamsModule } from '@xmotion/aws-ssm-param-nestjs';

@Module({
  imports: [
    AWSSSMParamsModule.registerAsync({
      imports: [ConfigModule],
      useFactory: async (config: ConfigService<any>) => ({
        ssmParamStorePath: config.get<string>('AWS_SSM_DBNAME'),
        ssmDecryptParams: true,
        ssmClientOptions: {
          region: config.get<string>('AWS_REGION'),
        },
      }),
      inject: [ConfigService],
    }),
  ],
})
export class AppModule {}
```

2. Import `ConfigParametersService` into your service and access configuration parameters in your service or provider:

   ```typescript
   import { Injectable } from '@nestjs/common';
   import { ConfigParametersService } from '@xmotion/aws-ssm-param-nestjs';

   @Injectable()
   export class ConfigService {
     constructor(
       private readonly configParametersService: ConfigParametersService,
     ) {}

     someMethod() {
       const myParameter = this.configParametersService.get<string>('dbname');
       // Use the parameter value in your code
     }
   }
   ```

## Version Compatibility

| NestJS Version | Support Status |
|----------------|----------------|
| NestJS 8.x     | ✅ Supported   |
| NestJS 9.x     | ✅ Supported   |
| NestJS 10.x    | ✅ Supported   |
| NestJS 11.x    | ✅ Supported   |

## Changelog

### 1.0.3 (Upcoming)
- Added support for NestJS 11
- Updated AWS SDK dependencies
- Updated TypeScript to version 5.3+
- Improved ESLint and Prettier configurations

### 1.0.2
- Initial public release

## Contributing

Contributions are welcome! If you find any issues or have suggestions for improvement, please create an issue or submit a pull request on the GitHub repository.

## License

This module is licensed under the [MIT License](LICENSE).