Design unified configuration management system for multi-environment deployment

[avrabe]

Summary

Create a comprehensive configuration management system that handles the complexity of multi-environment deployment (development, staging, production) across native and WASM targets, with support for runtime configuration updates and environment-specific optimizations.

Background

The framework currently has fragmented configuration across different components. As we add WASM support, component model deployment, and various backend implementations, we need a unified configuration system that:

• Supports environment-specific configuration (dev/staging/production)
• Handles WASM vs native target differences
• Provides runtime configuration updates for components
• Manages secrets and sensitive configuration securely
• Enables configuration validation and schema enforcement

Implementation Tasks

Core Configuration Infrastructure

• Create pulseengine-mcp-config crate with trait-based abstractions
• Design hierarchical configuration with environment inheritance
• Implement configuration validation and schema enforcement
• Add support for multiple configuration sources (files, environment, remote)

Configuration Format Support

• TOML - Primary format for static configuration
• YAML - Alternative format with better readability
• JSON - Programmatic configuration and API integration
• Environment Variables - Container and deployment integration
• Command Line Arguments - Override support for tooling

Environment-Aware Configuration

# config/default.toml
[server]
host = "127.0.0.1"
port = 8080
log_level = "info"

[storage]
backend = "file"
encryption = true

# config/development.toml
[server]
log_level = "debug"

[storage]
backend = "memory"
encryption = false

# config/production.toml
[server]
host = "0.0.0.0"

[monitoring]
metrics_enabled = true
exporters = ["prometheus", "statsd"]

WASM-Specific Configuration

• Feature-flagged configuration for WASM vs native
• Component model deployment configuration
• WASI interface and capability configuration
• Host integration and resource limit settings

Configuration Schema and Validation

• JSON Schema definitions for all configuration structures
• Compile-time validation using serde with custom derives
• Runtime validation with detailed error reporting
• Configuration migration tools for version upgrades

Secrets Management

• Integration with external secret stores (HashiCorp Vault, AWS Secrets Manager)
• Environment variable injection for sensitive values
• Encrypted configuration files with key management
• WASM-compatible secret handling

Runtime Configuration Updates

• Hot-reload configuration for non-critical settings
• Configuration change notifications and handlers
• Graceful restart for critical configuration changes
• Configuration rollback on validation failures

Component-Specific Configuration

Storage Configuration

#[derive(Config, Serialize, Deserialize)]
pub struct StorageConfig {
    /// Storage backend type
    pub backend: StorageBackend,
    /// Encryption settings
    pub encryption: EncryptionConfig,
    /// Backup and retention policies
    pub retention: RetentionPolicy,
    /// WASM-specific settings
    #[cfg(target_arch = "wasm32")]
    pub wasm: WasmStorageConfig,
}

Transport Configuration

#[derive(Config, Serialize, Deserialize)]
pub struct TransportConfig {
    /// Available transports
    pub transports: Vec<TransportType>,
    /// Default transport selection
    pub default_transport: TransportType,
    /// Transport-specific settings
    pub stdio: Option<StdioConfig>,
    pub http: Option<HttpConfig>,
    #[cfg(feature = "component-model")]
    pub component: Option<ComponentConfig>,
}

Component Model Configuration

#[derive(Config, Serialize, Deserialize)]
pub struct ComponentConfig {
    /// Component loading settings
    pub loader: ComponentLoader,
    /// Resource limits
    pub limits: ResourceLimits,
    /// Security policies
    pub security: SecurityPolicy,
    /// Host integration settings
    pub host: HostConfig,
}

Development Tools

• Configuration generation and templating tools
• Environment-specific configuration validation
• Configuration diff and merge utilities
• Interactive configuration builder

Integration Points

Framework Integration

• Automatic configuration loading during framework initialization
• Configuration injection for all framework components
• Environment detection and automatic profile selection
• Configuration-driven feature enablement

CI/CD Integration

• Configuration validation in CI pipelines
• Environment-specific deployment configurations
• Configuration drift detection
• Automated configuration updates

Monitoring Integration

• Configuration change logging and auditing
• Configuration health checks
• Performance impact monitoring for config changes
• Configuration compliance reporting

Security Considerations

• Secure default configurations
• Configuration access control and permissions
• Audit logging for configuration changes
• Secrets encryption at rest and in transit
• Configuration integrity verification

WASM Deployment Specifics

• Component-specific configuration injection
• Host-side configuration management for WASM components
• Configuration sharing between components
• WASI-compatible configuration interfaces

Example Configuration Structure

config/
├── default.toml              # Base configuration
├── development.toml          # Development overrides
├── staging.toml             # Staging environment
├── production.toml          # Production environment
├── components/              # Component-specific config
│   ├── auth.toml
│   ├── storage.toml
│   └── transport.toml
├── schemas/                 # JSON schemas
│   └── config.schema.json
└── secrets/                 # Secret templates
    └── secrets.template.toml

Configuration Loading Priority

1. Default configuration files
2. Environment-specific configuration
3. Component-specific overrides
4. Environment variables
5. Command line arguments
6. Runtime configuration updates

Acceptance Criteria

• Unified configuration system across all framework components
• Environment-aware configuration with inheritance
• WASM-compatible configuration loading and management
• Comprehensive validation and schema enforcement
• Secure secrets management integration
• Runtime configuration update support
• Complete documentation and migration guides

Related Issues

• WASM32-WASIP2 Target Support (Add WASM32-WASIP2 target support for WebAssembly deployment #26)
• Storage Backend Abstraction (Create trait-based storage backend abstraction with WASM compatibility #29)
• Performance Monitoring Framework (Implement unified performance monitoring and metrics framework #34)

References

• Rust config crate
• 12-Factor App Configuration
• HashiCorp Vault
• JSON Schema Specification