Create initial backend (#7)

Closes #3

Reviewed-on: #7

backend/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"context"
+	"embed"
+	"errors"
+	"github.com/gin-gonic/gin"
+	"log"
+	"net/http"
+	"os"
+)
+
+//go:embed migrations/*.sql
+var migrations embed.FS
+var db *Db
+
+type ServerConfig struct {
+	Datasource string
+	Port       string
+	Started    chan bool
+}
+
+func getUsers(c *gin.Context) {
+	users, err := db.GetUsers()
+	if err != nil {
+		log.Printf("Error getting users: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Internal Server Error"})
+		return
+	}
+	c.IndentedJSON(http.StatusOK, users)
+}
+
+func main() {
+	config := ServerConfig{
+		Datasource: os.Getenv("DB_PATH"),
+	}
+	start(context.Background(), &config)
+}
+
+func start(ctx context.Context, config *ServerConfig) {
+	db = NewDb(config.Datasource)
+	defer db.db.MustClose()
+	router := gin.Default()
+	router.GET("/api/users", getUsers)
+
+	srv := &http.Server{
+		Addr:    ":" + config.Port,
+		Handler: router.Handler(),
+	}
+	go func() {
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Fatalf("listen: %s\n", err)
+		}
+	}()
+
+	log.Printf("Running server on port %s\n", config.Port)
+	config.Started <- true
+	<-ctx.Done()
+	log.Println("Shutting down")
+	if err := srv.Shutdown(context.Background()); err != nil {
+		log.Fatalf("Server forced to shutdown: %v", err)
+	}
+}