tercul-backend/main.go

package main

import (
	"context"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"tercul/config"
	"tercul/internal/app"
	"tercul/logger"
	"time"

	"github.com/hibiken/asynq"
)

// main is the entry point for the Tercul application.
// It uses the ApplicationBuilder and ServerFactory to initialize all components
// and start the servers in a clean, maintainable way.
func main() {
	// Load configuration from environment variables
	config.LoadConfig()

	// Initialize structured logger with appropriate log level
	logger.SetDefaultLevel(logger.InfoLevel)
	logger.LogInfo("Starting Tercul application",
		logger.F("environment", config.Cfg.Environment),
		logger.F("version", "1.0.0"))

	// Build application components
	appBuilder := app.NewApplicationBuilder()
	if err := appBuilder.Build(); err != nil {
		logger.LogFatal("Failed to build application",
			logger.F("error", err))
	}
	defer appBuilder.Close()

	// Create server factory
	serverFactory := app.NewServerFactory(appBuilder)

	// Create servers
	graphQLServer, err := serverFactory.CreateGraphQLServer()
	if err != nil {
		logger.LogFatal("Failed to create GraphQL server",
			logger.F("error", err))
	}

	backgroundServers, err := serverFactory.CreateBackgroundJobServers()
	if err != nil {
		logger.LogFatal("Failed to create background job servers",
			logger.F("error", err))
	}

	playgroundServer := serverFactory.CreatePlaygroundServer()

	// Start HTTP servers in goroutines
	go func() {
		logger.LogInfo("Starting GraphQL server",
			logger.F("port", config.Cfg.ServerPort))
		if err := graphQLServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			logger.LogFatal("Failed to start GraphQL server",
				logger.F("error", err))
		}
	}()

	go func() {
		logger.LogInfo("Starting GraphQL playground",
			logger.F("port", config.Cfg.PlaygroundPort))
		if err := playgroundServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			logger.LogFatal("Failed to start GraphQL playground",
				logger.F("error", err))
		}
	}()

	// Start background job servers in goroutines
	for i, server := range backgroundServers {
		go func(serverIndex int, srv *asynq.Server) {
			logger.LogInfo("Starting background job server",
				logger.F("serverIndex", serverIndex))
			if err := srv.Run(asynq.NewServeMux()); err != nil {
				logger.LogError("Background job server failed",
					logger.F("serverIndex", serverIndex),
					logger.F("error", err))
			}
		}(i, server)
	}

	// Wait for interrupt signal to gracefully shutdown the servers
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	logger.LogInfo("Shutting down servers...")

	// Graceful shutdown
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	if err := graphQLServer.Shutdown(ctx); err != nil {
		logger.LogError("GraphQL server forced to shutdown",
			logger.F("error", err))
	}

	if err := playgroundServer.Shutdown(ctx); err != nil {
		logger.LogError("GraphQL playground forced to shutdown",
			logger.F("error", err))
	}

	// Shutdown background job servers
	for i, server := range backgroundServers {
		server.Shutdown()
		logger.LogInfo("Background job server shutdown",
			logger.F("serverIndex", i))
	}

	logger.LogInfo("All servers shutdown successfully")
}