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An ecosystem framework for Rust. IoC/Context/Config/Web/ORM

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# Verdure

[![Crates.io version](https://img.shields.io/crates/v/verdure.svg?style=flat-square)](https://crates.io/crates/verdure)
[![docs.rs docs](https://img.shields.io/badge/docs-latest-blue.svg?style=flat-square)](https://docs.rs/verdure)

English | [简体中文](./README-zh_cn.md)

Verdure - An ecosystem framework for Rust

True to its name, Verdure represents a vibrant and thriving ecosystem framework, dedicated to facilitating convenient and efficient Rust development through a comprehensive, integrated suite of tools and patterns.

The project is currently in the foundational development phase. We are looking for enthusiastic contributors to join us in building it.

## Ecosystem Modules

### ✅ Current Release (v0.0.5) - Application Context

- **verdure-core**: Foundation types, error handling, and common utilities
- **verdure-ioc**: Dependency injection container and component management
- **verdure-macros**: Compile-time code generation and annotation processing
- **verdure-context**: Application context and configuration management

### 🚧 Upcoming Releases - Complete Ecosystem

**Application Framework**:
- verdure-boot: Auto-configuration and application bootstrapping
- verdure-config: Configuration management and property binding
- verdure-profiles: Environment-specific configuration profiles

**Web & Network**:
- verdure-web: Web framework with MVC patterns
- verdure-http: HTTP client and server abstractions
- verdure-websocket: WebSocket support and real-time communication

**Data & Persistence**:
- verdure-data: Data access patterns and repository abstractions
- verdure-orm: Object-relational mapping with active record patterns
- verdure-transaction: Transaction management and ACID support

**Security & Authentication**:
- verdure-security: Authentication and authorization framework
- verdure-oauth: OAuth2 and OpenID Connect integration

## Current Features (v0.0.5)

- [x] **IoC Container**: Comprehensive dependency injection with automatic resolution
- [x] **Component Lifecycle**: Singleton and prototype scopes with lifecycle events
- [x] **Annotation-Driven Development**: `#[derive(Component)]` and `#[autowired]` for declarative configuration
- [x] **Event System**: Container and component lifecycle event handling
- [x] **Circular Dependency Detection**: Prevents infinite dependency loops
- [x] **Thread Safety**: Full concurrent access support for multi-threaded applications
- [x] **Application Context**: Comprehensive application context management and event system
- [x] **Auto-Configuration**: Automatic configuration file reading and component assembly
- [x] **Multi-Format Configuration Support**: YAML, TOML, and Properties file formats
- [x] **Default Value Support**: `#[config_default]` and `#[config_default_t]` attributes

### 📋 Roadmap - Building the Complete Ecosystem

- [ ] **Auto-Configuration**: Out-of-the-box application bootstrapping and configuration management  🚧
- [ ] **Web Framework**: MVC patterns and REST API development
- [ ] **Data Access**: Repository patterns and ORM integration
- [ ] **Security Framework**: Authentication and authorization
- [ ] **AOP (Aspect-Oriented Programming)**: Cross-cutting concern support
- [ ] **Message-Driven Architecture**: Event-driven programming patterns
- [ ] **Observability**: Metrics, tracing, and health checks
- [ ] And much more...

## Add Dependency

```toml
verdure = "0.0.5"
inventory = "0.3"
```
The underlying implementation heavily relies on inventory. Our thanks go to the authors of this excellent repository.

## Context - Recommended
### Quick Start
#### Configuration - Automatic Configuration File Reading
`application.yml` example file:
```yaml
server:
  name: TestApp
  port: 8080
datasource:
  host: 127.0.0.1
  username: root
  password: 123456
  database: test
```
Structs with the `Configuration` derive are automatically registered as `Component` instances and will automatically read configuration and load it. If the key does not exist in the configuration file, it will use `config_default` or `config_default_t`. If there is no default value, it will be `None`.
Note that field types must be wrapped with `Option<T>`.

**Supported Configuration Formats**:
- **YAML**: `.yml`, `.yaml` files
- **TOML**: `.toml` files
- **Properties**: `.properties` files

**Default Value Attributes**:
- `#[config_default(value)]`: Provide literal default values
- `#[config_default_t(expression)]`: Provide expression-based default values, supporting complex calculations
```rust
use std::sync::Arc;
use verdure::event::{ContextAwareEventListener, ContextInitializingEvent};
use verdure::{ApplicationContext, ComponentFactory, Configuration, Component};

#[derive(Debug, Configuration)]
#[configuration("server")]
struct ServerConfig {
    // server.name
    name: Option<String>,
    // server.port
    #[config_default(8080)]
    port: Option<u32>,
}

#[derive(Debug, Configuration)]
#[configuration("datasource")]
struct DatasourceConfig {
    // datasource.host
    #[config_default_t(Some(get_host()))]
    host: Option<String>,
    // datasource.port
    #[config_default(3306)]
    port: Option<u32>,
    // datasource.username
    #[config_default("......")]
    username: Option<String>,
    // datasource.password
    #[config_default("......")]
    password: Option<String>,
    // datasource.database
    #[config_default("test_db")]
    database: Option<String>,
}

fn get_host() -> String {
    "127.0.0.1".to_string()
}
```

#### Advanced Configuration Features

**Configuration Precedence** (from highest to lowest):
1. Runtime Properties: Values set via `set_config()`
2. Configuration Sources: Sources added via `add_config_source()` (last added wins)
3. Environment Variables: System environment variables
4. Configuration Files: Files loaded via various methods

**Event System**:
- `ContextInitializingEvent`: Triggered when context initialization begins
- `ContextInitializedEvent`: Triggered when context initialization completes
- `ConfigurationChangedEvent`: Triggered when configuration changes at runtime

#### ApplicationContext Initialization

```rust
struct ApplicationStartEvent;
impl ContextAwareEventListener<ContextInitializingEvent> for ApplicationStartEvent {
    fn on_context_event(&self, _event: &ContextInitializingEvent, context: &ApplicationContext) {
        let container = context.container();
        let datasource_config = container
            .get_component::<DatasourceConfig>()
            .expect("datasource config not found")
            .clone();
        // ... do something with datasource_config
        // context.register_component(Arc::new(datasource_component));
    }
}

fn init_context() -> Arc<ApplicationContext> {
    let context = ApplicationContext::builder()
        // Load configuration files (supports YAML, TOML, Properties formats)
        .with_config_file("application.yml")
        .build();
    match context {
        Ok(context) => {
            context.subscribe_to_context_events(ApplicationStartEvent);
            match context.initialize() {
                Ok(_) => Arc::new(context),
                Err(e) => {
                    panic!("failed to initialize context: {}", e);
                }
            }
        }
        Err(e) => panic!("failed to new context: {}", e),
    }
}

#[derive(Component)]
struct TestA {
    #[autowired]
    test_b: Arc<TestB>,
    test_c: Option<TestC>,
    test_d: TestD
}

#[derive(Component)]
struct TestB {
    a: i32,
    b: i32,
}

fn main() {
    let context = init_context();
    let server_config = context
        .get_component::<ServerConfig>()
        .expect("datasource config not found");
    println!("server config: {:?}", server_config);
    // ... do something with context
    // get more component......
}
```

## IoC / DI

### Initialize the Container
Recommended to use `ApplicationContext`
```rust
use std::sync::Arc;

fn init_container() {
    let container = ComponentContainer::new();
    match container.initialize() {
        Ok(_) => Arc::new(container),
        Err(e) => panic!("Failed to initialize container {}", e)
    }
}
```
### Register a Component
#### Automatic Registration and Injection (Derive)
Adding the `#[derive(Component)]` macro to a struct automatically registers it with the container as a singleton by default. For fields marked with the `#[autowired]` attribute, an instance will be automatically retrieved from the container and injected.
```rust
use verdure::Component;

#[derive(Component)]
struct TestA {
    #[autowired]
    test_b: Arc<TestB>,
    test_c: Option<TestC>,
    test_d: TestD
}

#[derive(Component)]
struct TestB {
    a: i32,
    b: i32,
}

struct TestC {
    a: i32
}

#[derive(Default)]
struct TestD {
    a: i32,
}
```
There are two important points to note:
* The field to be injected must be wrapped in an `Arc<T>`.
* Fields that do not require injection must either be of type `Option<T> ` or implement the `Default` trait.

#### Manual Registration and Component Retrieval
```rust
#[derive(Debug)]
struct Config {
    name: &'static str,
    port: u16
}

fn main() {
    let container = init_container();
    container.register_component(Arc::new(config));
    let config = container.get_component::<Config>().unwrap();
    println!("config: {:?}", config);
}
```

### Container Event Listening
#### Using the Macro
```rust
fn handle_container_lifecycle(event: &ContainerLifecycleEvent) {
    match event {
        ContainerLifecycleEvent::InitializationStarted {
            container,
            component_count,
        } => {
            // You can register necessary components during initialization here.
        }
        ContainerLifecycleEvent::InitializationCompleted {
            container: _,
            component_count,
            duration,
        } => {
            println!(
                "Container initialization completed\nComponent count: {}\nTime taken: {:?}",
                component_count, duration
            );
        }
        ContainerLifecycleEvent::ComponentCreated {
            container: _,
            component_name,
            component_type_id,
            creation_duration,
        } => {
            println!(
                "Component created\nName: {}\nType ID: {:?}\nCreation time: {:?}",
                component_name, component_type_id, creation_duration
            );
        }
    }
}
lifecycle_listener!("app_container_listener", handle_container_lifecycle);
```

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