qail-gateway 0.1.0

QAIL Gateway - Native data layer replacing REST/GraphQL
Documentation 
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//! Gateway server implementation
//!
//! Main entry point for running the QAIL Gateway.

use crate::config::GatewayConfig;
use crate::error::GatewayError;
use crate::policy::PolicyEngine;

/// The QAIL Gateway server
pub struct Gateway {
    config: GatewayConfig,
    policy_engine: PolicyEngine,
}

impl Gateway {
    /// Create a new gateway with the given configuration
    pub fn new(config: GatewayConfig) -> Self {
        Self {
            config,
            policy_engine: PolicyEngine::new(),
        }
    }
    
    /// Create a gateway builder
    pub fn builder() -> GatewayBuilder {
        GatewayBuilder::default()
    }
    
    /// Initialize the gateway (load schema, policies, connect to DB)
    /// 
    /// # Errors
    /// Returns error if initialization fails
    pub async fn init(&mut self) -> Result<(), GatewayError> {
        tracing::info!("Initializing QAIL Gateway...");
        
        // Load schema
        tracing::info!("Loading schema from: {}", self.config.schema_path);
        // TODO: Load and validate schema.qail
        
        // Load policies
        if let Some(policy_path) = &self.config.policy_path {
            tracing::info!("Loading policies from: {}", policy_path);
            self.policy_engine.load_from_file(policy_path)?;
        }
        
        // Connect to database
        tracing::info!("Connecting to database...");
        // TODO: Initialize qail-pg connection pool
        
        tracing::info!("Gateway initialized successfully");
        Ok(())
    }
    
    /// Start serving requests
    /// 
    /// # Errors
    /// Returns error if server fails to start
    pub async fn serve(&self) -> Result<(), GatewayError> {
        tracing::info!("Starting QAIL Gateway on {}", self.config.bind_address);
        
        // TODO: Start HTTP server with axum
        // For now, just log that we would serve
        tracing::warn!("HTTP server not yet implemented");
        
        // Keep running (placeholder)
        loop {
            tokio::time::sleep(std::time::Duration::from_secs(60)).await;
        }
    }
}

/// Builder for the Gateway
#[derive(Debug, Default)]
pub struct GatewayBuilder {
    config: GatewayConfig,
}

impl GatewayBuilder {
    /// Set the database URL
    pub fn database(mut self, url: impl Into<String>) -> Self {
        self.config.database_url = url.into();
        self
    }
    
    /// Set the schema path
    pub fn schema(mut self, path: impl Into<String>) -> Self {
        self.config.schema_path = path.into();
        self
    }
    
    /// Set the policy path
    pub fn policy(mut self, path: impl Into<String>) -> Self {
        self.config.policy_path = Some(path.into());
        self
    }
    
    /// Set the bind address
    pub fn bind(mut self, addr: impl Into<String>) -> Self {
        self.config.bind_address = addr.into();
        self
    }
    
    /// Build the gateway
    pub fn build(self) -> Gateway {
        Gateway::new(self.config)
    }
    
    /// Build and initialize the gateway
    /// 
    /// # Errors
    /// Returns error if initialization fails
    pub async fn build_and_init(self) -> Result<Gateway, GatewayError> {
        let mut gateway = self.build();
        gateway.init().await?;
        Ok(gateway)
    }
}