Initial commit

internal/database/database.go

@@ -0,0 +1,113 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"time"
+
+	_ "github.com/joho/godotenv/autoload"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// Service represents a service that interacts with a database.
+type Service interface {
+	// Health returns a map of health status information.
+	// The keys and values in the map are service-specific.
+	Health() map[string]string
+
+	// Close terminates the database connection.
+	// It returns an error if the connection cannot be closed.
+	Close() error
+}
+
+type service struct {
+	db *sql.DB
+}
+
+var (
+	dburl      = os.Getenv("BLUEPRINT_DB_URL")
+	dbInstance *service
+)
+
+func New() Service {
+	// Reuse Connection
+	if dbInstance != nil {
+		return dbInstance
+	}
+
+	db, err := sql.Open("sqlite3", dburl)
+	if err != nil {
+		// This will not be a connection error, but a DSN parse error or
+		// another initialization error.
+		log.Fatal(err)
+	}
+
+	dbInstance = &service{
+		db: db,
+	}
+	return dbInstance
+}
+
+// Health checks the health of the database connection by pinging the database.
+// It returns a map with keys indicating various health statistics.
+func (s *service) Health() map[string]string {
+	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+	defer cancel()
+
+	stats := make(map[string]string)
+
+	// Ping the database
+	err := s.db.PingContext(ctx)
+	if err != nil {
+		stats["status"] = "down"
+		stats["error"] = fmt.Sprintf("db down: %v", err)
+		log.Fatalf("db down: %v", err) // Log the error and terminate the program
+		return stats
+	}
+
+	// Database is up, add more statistics
+	stats["status"] = "up"
+	stats["message"] = "It's healthy"
+
+	// Get database stats (like open connections, in use, idle, etc.)
+	dbStats := s.db.Stats()
+	stats["open_connections"] = strconv.Itoa(dbStats.OpenConnections)
+	stats["in_use"] = strconv.Itoa(dbStats.InUse)
+	stats["idle"] = strconv.Itoa(dbStats.Idle)
+	stats["wait_count"] = strconv.FormatInt(dbStats.WaitCount, 10)
+	stats["wait_duration"] = dbStats.WaitDuration.String()
+	stats["max_idle_closed"] = strconv.FormatInt(dbStats.MaxIdleClosed, 10)
+	stats["max_lifetime_closed"] = strconv.FormatInt(dbStats.MaxLifetimeClosed, 10)
+
+	// Evaluate stats to provide a health message
+	if dbStats.OpenConnections > 40 { // Assuming 50 is the max for this example
+		stats["message"] = "The database is experiencing heavy load."
+	}
+
+	if dbStats.WaitCount > 1000 {
+		stats["message"] = "The database has a high number of wait events, indicating potential bottlenecks."
+	}
+
+	if dbStats.MaxIdleClosed > int64(dbStats.OpenConnections)/2 {
+		stats["message"] = "Many idle connections are being closed, consider revising the connection pool settings."
+	}
+
+	if dbStats.MaxLifetimeClosed > int64(dbStats.OpenConnections)/2 {
+		stats["message"] = "Many connections are being closed due to max lifetime, consider increasing max lifetime or revising the connection usage pattern."
+	}
+
+	return stats
+}
+
+// Close closes the database connection.
+// It logs a message indicating the disconnection from the specific database.
+// If the connection is successfully closed, it returns nil.
+// If an error occurs while closing the connection, it returns the error.
+func (s *service) Close() error {
+	log.Printf("Disconnected from database: %s", dburl)
+	return s.db.Close()
+}

internal/server/routes.go

@@ -0,0 +1,48 @@
+package server
+
+import (
+	"net/http"
+
+	"billit/cmd/web"
+	"github.com/a-h/templ"
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+)
+
+func (s *Server) RegisterRoutes() http.Handler {
+	e := echo.New()
+	e.Use(middleware.Logger())
+	e.Use(middleware.Recover())
+
+	e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
+		AllowOrigins:     []string{"https://*", "http://*"},
+		AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS", "PATCH"},
+		AllowHeaders:     []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		AllowCredentials: true,
+		MaxAge:           300,
+	}))
+
+	fileServer := http.FileServer(http.FS(web.Files))
+	e.GET("/assets/*", echo.WrapHandler(fileServer))
+
+	e.GET("/web", echo.WrapHandler(templ.Handler(web.HelloForm())))
+	e.POST("/hello", echo.WrapHandler(http.HandlerFunc(web.HelloWebHandler)))
+
+	e.GET("/", s.HelloWorldHandler)
+
+	e.GET("/health", s.healthHandler)
+
+	return e
+}
+
+func (s *Server) HelloWorldHandler(c echo.Context) error {
+	resp := map[string]string{
+		"message": "Hello World",
+	}
+
+	return c.JSON(http.StatusOK, resp)
+}
+
+func (s *Server) healthHandler(c echo.Context) error {
+	return c.JSON(http.StatusOK, s.db.Health())
+}

internal/server/routes_test.go

@@ -0,0 +1,39 @@
+package server
+
+import (
+	"encoding/json"
+	"github.com/labstack/echo/v4"
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"testing"
+)
+
+func TestHandler(t *testing.T) {
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	resp := httptest.NewRecorder()
+	c := e.NewContext(req, resp)
+	s := &Server{}
+	// Assertions
+	if err := s.HelloWorldHandler(c); err != nil {
+		t.Errorf("handler() error = %v", err)
+		return
+	}
+	if resp.Code != http.StatusOK {
+		t.Errorf("handler() wrong status code = %v", resp.Code)
+		return
+	}
+	expected := map[string]string{"message": "Hello World"}
+	var actual map[string]string
+	// Decode the response body into the actual map
+	if err := json.NewDecoder(resp.Body).Decode(&actual); err != nil {
+		t.Errorf("handler() error decoding response body: %v", err)
+		return
+	}
+	// Compare the decoded response with the expected value
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("handler() wrong response body. expected = %v, actual = %v", expected, actual)
+		return
+	}
+}

internal/server/server.go

@@ -0,0 +1,39 @@
+package server
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	_ "github.com/joho/godotenv/autoload"
+
+	"billit/internal/database"
+)
+
+type Server struct {
+	port int
+
+	db database.Service
+}
+
+func NewServer() *http.Server {
+	port, _ := strconv.Atoi(os.Getenv("PORT"))
+	NewServer := &Server{
+		port: port,
+
+		db: database.New(),
+	}
+
+	// Declare Server config
+	server := &http.Server{
+		Addr:         fmt.Sprintf(":%d", NewServer.port),
+		Handler:      NewServer.RegisterRoutes(),
+		IdleTimeout:  time.Minute,
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 30 * time.Second,
+	}
+
+	return server
+}