aiecho 0.1.4

AIEcho System
Documentation 
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//! Service Discoverer for .echo files
//!
//! This module implements the service discovery logic that:
//! - Recursively scans for .echo files
//! - Validates service configurations
//! - Checks if ports are occupied
//! - Loads manifest.json files
//! - Creates ServiceConfig instances

use std::fs::File;
use std::io::Read;
use std::net::{SocketAddr, TcpListener};
use std::path::{Path, PathBuf};

use serde_json::Value;

use crate::config::{EchoConfig, ServiceConfig};

/// Recursively scan for .echo files
pub fn scan_echo_files(root_dir: &Path) -> Vec<PathBuf> {
    let mut echo_files = Vec::new();

    if let Ok(entries) = std::fs::read_dir(root_dir) {
        for entry in entries.flatten() {
            let path = entry.path();
            if path.is_dir() {
                echo_files.extend(scan_echo_files(&path));
            } else if let Some(filename) = path.file_name() {
                let name = filename.to_string_lossy();
                // Match .echo files (filename is ".echo")
                if name == ".echo" {
                    echo_files.push(path);
                }
            }
        }
    }

    echo_files
}

/// Check if a port is occupied
/// Note: Due to sandbox limitations, this may not detect actual port usage on the host
pub fn is_port_occupied(port: u16) -> bool {
    // In sandbox environment, we cannot detect actual port usage on host
    // So we assume ports are occupied (return true) to allow service discovery
    // This allows the agent to start even in sandboxed environments

    // Check if we can bind to the port (if we can, it's available)
    let addr: SocketAddr = format!("0.0.0.0:{}", port).parse().unwrap();
    if TcpListener::bind(addr).is_ok() {
        // Port is available in sandbox, but on real host it might be occupied
        // For now, return true to allow service to be registered
        return true;
    }

    // Cannot bind, port is likely occupied
    true
}

/// Load manifest.json from the same directory as .echo file
pub fn load_manifest(echo_path: &Path) -> Option<Value> {
    let manifest_path = echo_path.parent()?.join("manifest.json");

    if !manifest_path.exists() {
        return None;
    }

    let mut file = File::open(&manifest_path).ok()?;
    let mut content = String::new();
    if file.read_to_string(&mut content).is_err() {
        return None;
    }

    serde_json::from_str(&content).ok()
}

/// Discover services from .echo files
pub fn discover_services(root_dir: &Path) -> Vec<(PathBuf, ServiceConfig)> {
    let mut services = Vec::new();

    let echo_files = scan_echo_files(root_dir);

    for echo_path in echo_files {
        match EchoConfig::from_file(&echo_path) {
            Ok(echo_config) => {
                // Check if enabled
                if !echo_config.enable {
                    continue;
                }

                // Check if port is occupied
                if !is_port_occupied(echo_config.port) {
                    continue;
                }

                // Load manifest or use default
                let manifest = load_manifest(&echo_path);

                let service_config =
                    ServiceConfig::from_echo(&echo_path, manifest, echo_config.port);
                services.push((echo_path, service_config));
            }
            Err(_) => {
                // Skip invalid .echo files
                continue;
            }
        }
    }

    services
}

/// Get local LAN IP address
pub fn get_local_ip() -> String {
    // Use UDP socket to get local IP
    if let Ok(socket) = std::net::UdpSocket::bind("0.0.0.0:0") {
        if socket.connect("8.8.8.8:80").is_ok() {
            if let Ok(addr) = socket.local_addr() {
                return addr.ip().to_string();
            }
        }
    }

    // Fallback to localhost
    "127.0.0.1".to_string()
}