feat: add app code

- journal domain package
- httpserver package
- html templates
- main.go in root dir

main.go

@@ -0,0 +1,92 @@
+package main
+
+import (
+	"context"
+	"embed"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"gitlab.mareshq.com/lab/journal/httpserver"
+	"gitlab.mareshq.com/lab/journal/journal"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+//go:embed assets/favicon.ico
+var favicon []byte
+
+//go:embed templates/*
+var templatesFS embed.FS
+
+func main() {
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	logger := log.New(os.Stdout, "", log.LstdFlags)
+
+	db, err := gorm.Open(sqlite.Open("var/local.db"), &gorm.Config{})
+	if err != nil {
+		logger.Fatalf("failed to connect database: %v", err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		logger.Fatalf("failed to get database: %v", err)
+	}
+
+	// graceful shutdown of database connections
+	defer func() {
+		err = sqlDB.Close()
+		if err != nil {
+			logger.Fatalf("failed to close database: %v", err)
+		}
+	}()
+
+	err = db.AutoMigrate(&journal.Entry{})
+	if err != nil {
+		logger.Fatalf("failed to migrate database: %v\n", err)
+	}
+
+	repo := journal.NewRepository(db)
+	tr := httpserver.NewTemplateRenderer(templatesFS)
+
+	mux := http.NewServeMux()
+
+	fav := httpserver.NewFavicon(favicon)
+	mux.HandleFunc("GET /favicon.ico", fav.FaviconHandler)
+
+	// Journal server is HTTP interface
+	journalServer := journal.NewServer(repo, tr, logger)
+	journalServer.RegisterRoutes(mux)
+
+	loggingMiddleware := httpserver.NewLoggingMiddleware(logger)
+
+	server := &http.Server{
+		Addr:    ":8080",
+		Handler: loggingMiddleware.Logging(mux),
+	}
+
+	// start the HTTP server in a goroutine
+	go func() {
+		logger.Printf("Starting HTTP server on %s\n", server.Addr)
+		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			logger.Fatalf("listen: %s\n", err)
+		}
+	}()
+
+	<-ctx.Done()
+	logger.Println("Received signal, shutting down...")
+
+	ctxShutdown, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	if err := server.Shutdown(ctxShutdown); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		logger.Fatalf("HTTP Server forced to shutdown: %v", err)
+	}
+
+	logger.Println("HTTP server shut down")
+}