cf-module-orchestrator 0.1.25

//! Module definition for `ModuleOrchestrator`

use anyhow::Result;
use async_trait::async_trait;
use std::sync::{Arc, OnceLock};
use tokio::sync::RwLock;

use modkit::DirectoryClient;
use modkit::context::ModuleCtx;
use modkit::contracts::{
    GrpcServiceCapability, OpenApiRegistry, RegisterGrpcServiceFn, RestApiCapability,
    SystemCapability,
};
use modkit::directory::LocalDirectoryClient;
use modkit::registry::ModuleRegistry;
use modkit::runtime::ModuleManager;

use cf_system_sdks::directory::DIRECTORY_SERVICE_NAME;

use crate::domain::service::ModulesService;
use crate::server;

/// Configuration for the module orchestrator
#[derive(Clone, Debug, Default, serde::Deserialize)]
#[allow(
    clippy::empty_structs_with_brackets,
    reason = "empty struct is required for config deserialization"
)]
pub struct ModuleOrchestratorConfig {}

/// Module Orchestrator - system module for service discovery
///
/// This module:
/// - Provides `DirectoryClient` to the `ClientHub` for in-process modules
/// - Exposes `DirectoryService` gRPC service via `grpc-hub`
/// - Tracks module instances and provides service resolution
/// - Exposes REST API to list all registered modules
#[modkit::module(
    name = "module-orchestrator",
    capabilities = [grpc, system, rest],
    client = cf_system_sdks::directory::DirectoryClient
)]
pub struct ModuleOrchestrator {
    config: RwLock<ModuleOrchestratorConfig>,
    directory_api: OnceLock<Arc<dyn DirectoryClient>>,
    module_manager: OnceLock<Arc<ModuleManager>>,
    modules_service: OnceLock<Arc<ModulesService>>,
}

impl Default for ModuleOrchestrator {
    fn default() -> Self {
        Self {
            config: RwLock::new(ModuleOrchestratorConfig {}),
            directory_api: OnceLock::new(),
            module_manager: OnceLock::new(),
            modules_service: OnceLock::new(),
        }
    }
}

#[async_trait]
impl SystemCapability for ModuleOrchestrator {
    fn pre_init(&self, sys: &modkit::runtime::SystemContext) -> anyhow::Result<()> {
        self.module_manager
            .set(Arc::clone(&sys.module_manager))
            .map_err(|_| anyhow::anyhow!("ModuleManager already set (pre_init called twice?)"))?;
        Ok(())
    }
}

#[async_trait]
impl modkit::Module for ModuleOrchestrator {
    async fn init(&self, ctx: &ModuleCtx) -> Result<()> {
        // Load configuration if present
        let cfg = ctx.config_or_default::<ModuleOrchestratorConfig>()?;
        *self.config.write().await = cfg;

        // Use the injected ModuleManager to create the DirectoryClient
        let manager =
            self.module_manager.get().cloned().ok_or_else(|| {
                anyhow::anyhow!("ModuleManager not wired into ModuleOrchestrator")
            })?;

        let api_impl: Arc<dyn DirectoryClient> =
            Arc::new(LocalDirectoryClient::new(manager.clone()));

        // Register in ClientHub directly
        ctx.client_hub()
            .register::<dyn DirectoryClient>(api_impl.clone());

        self.directory_api
            .set(api_impl)
            .map_err(|_| anyhow::anyhow!("DirectoryClient already set (init called twice?)"))?;

        // Build compiled-module catalog from inventory and create the ModulesService
        let registry = ModuleRegistry::discover_and_build()
            .map_err(|e| anyhow::anyhow!("Failed to build module registry: {e}"))?;
        let modules_service = Arc::new(ModulesService::new(&registry, manager));
        self.modules_service
            .set(modules_service)
            .map_err(|_| anyhow::anyhow!("ModulesService already set (init called twice?)"))?;

        tracing::info!("ModuleOrchestrator initialized");

        Ok(())
    }
}

impl RestApiCapability for ModuleOrchestrator {
    fn register_rest(
        &self,
        _ctx: &ModuleCtx,
        router: axum::Router,
        openapi: &dyn OpenApiRegistry,
    ) -> Result<axum::Router> {
        let service = Arc::clone(
            self.modules_service
                .get()
                .ok_or_else(|| anyhow::anyhow!("ModulesService not initialized"))?,
        );

        let router = crate::api::rest::routes::register_routes(router, openapi, service);

        tracing::info!("ModuleOrchestrator REST routes registered");
        Ok(router)
    }
}

/// Export gRPC services to `grpc-hub`
#[async_trait]
impl GrpcServiceCapability for ModuleOrchestrator {
    async fn get_grpc_services(&self, _ctx: &ModuleCtx) -> Result<Vec<RegisterGrpcServiceFn>> {
        let api = self
            .directory_api
            .get()
            .cloned()
            .ok_or_else(|| anyhow::anyhow!("DirectoryClient not initialized"))?;

        // Build DirectoryService
        let directory_svc = server::make_directory_service(api);

        Ok(vec![RegisterGrpcServiceFn {
            service_name: DIRECTORY_SERVICE_NAME,
            register: Box::new(move |routes| {
                routes.add_service(directory_svc.clone());
            }),
        }])
    }
}