commit

internal/database/database.go

@@ -0,0 +1,115 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"time"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+	_ "github.com/joho/godotenv/autoload"
+)
+
+// 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 (
+	database   = os.Getenv("BLUEPRINT_DB_DATABASE")
+	password   = os.Getenv("BLUEPRINT_DB_PASSWORD")
+	username   = os.Getenv("BLUEPRINT_DB_USERNAME")
+	port       = os.Getenv("BLUEPRINT_DB_PORT")
+	host       = os.Getenv("BLUEPRINT_DB_HOST")
+	schema     = os.Getenv("BLUEPRINT_DB_SCHEMA")
+	dbInstance *service
+)
+
+func New() Service {
+	// Reuse Connection
+	if dbInstance != nil {
+		return dbInstance
+	}
+	connStr := fmt.Sprintf("postgres://%s:%s@%s:%s/%s?sslmode=disable&search_path=%s", username, password, host, port, database, schema)
+	db, err := sql.Open("pgx", connStr)
+	if err != nil {
+		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", database)
+	return s.db.Close()
+}

internal/database/database_test.go

@@ -0,0 +1,100 @@
+package database
+
+import (
+	"context"
+	"log"
+	"testing"
+	"time"
+
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/modules/postgres"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+func mustStartPostgresContainer() (func(context.Context, ...testcontainers.TerminateOption) error, error) {
+	var (
+		dbName = "database"
+		dbPwd  = "password"
+		dbUser = "user"
+	)
+
+	dbContainer, err := postgres.Run(
+		context.Background(),
+		"postgres:latest",
+		postgres.WithDatabase(dbName),
+		postgres.WithUsername(dbUser),
+		postgres.WithPassword(dbPwd),
+		testcontainers.WithWaitStrategy(
+			wait.ForLog("database system is ready to accept connections").
+				WithOccurrence(2).
+				WithStartupTimeout(5*time.Second)),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	database = dbName
+	password = dbPwd
+	username = dbUser
+
+	dbHost, err := dbContainer.Host(context.Background())
+	if err != nil {
+		return dbContainer.Terminate, err
+	}
+
+	dbPort, err := dbContainer.MappedPort(context.Background(), "5432/tcp")
+	if err != nil {
+		return dbContainer.Terminate, err
+	}
+
+	host = dbHost
+	port = dbPort.Port()
+
+	return dbContainer.Terminate, err
+}
+
+func TestMain(m *testing.M) {
+	teardown, err := mustStartPostgresContainer()
+	if err != nil {
+		log.Fatalf("could not start postgres container: %v", err)
+	}
+
+	m.Run()
+
+	if teardown != nil && teardown(context.Background()) != nil {
+		log.Fatalf("could not teardown postgres container: %v", err)
+	}
+}
+
+func TestNew(t *testing.T) {
+	srv := New()
+	if srv == nil {
+		t.Fatal("New() returned nil")
+	}
+}
+
+func TestHealth(t *testing.T) {
+	srv := New()
+
+	stats := srv.Health()
+
+	if stats["status"] != "up" {
+		t.Fatalf("expected status to be up, got %s", stats["status"])
+	}
+
+	if _, ok := stats["error"]; ok {
+		t.Fatalf("expected error not to be present")
+	}
+
+	if stats["message"] != "It's healthy" {
+		t.Fatalf("expected message to be 'It's healthy', got %s", stats["message"])
+	}
+}
+
+func TestClose(t *testing.T) {
+	srv := New()
+
+	if srv.Close() != nil {
+		t.Fatalf("expected Close() to return nil")
+	}
+}

internal/server/routes.go

@@ -0,0 +1,71 @@
+package server
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+
+	"github.com/a-h/templ"
+	"go-htmx/cmd/web"
+)
+
+func (s *Server) RegisterRoutes() http.Handler {
+	mux := http.NewServeMux()
+
+	// Register routes
+	mux.HandleFunc("/", s.HelloWorldHandler)
+
+	mux.HandleFunc("/health", s.healthHandler)
+
+	fileServer := http.FileServer(http.FS(web.Files))
+	mux.Handle("/assets/", fileServer)
+	mux.Handle("/web", templ.Handler(web.HelloForm()))
+	mux.HandleFunc("/hello", web.HelloWebHandler)
+
+	// Wrap the mux with CORS middleware
+	return s.corsMiddleware(mux)
+}
+
+func (s *Server) corsMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Set CORS headers
+		w.Header().Set("Access-Control-Allow-Origin", "*") // Replace "*" with specific origins if needed
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, PATCH")
+		w.Header().Set("Access-Control-Allow-Headers", "Accept, Authorization, Content-Type, X-CSRF-Token")
+		w.Header().Set("Access-Control-Allow-Credentials", "false") // Set to "true" if credentials are required
+
+		// Handle preflight OPTIONS requests
+		if r.Method == http.MethodOptions {
+			w.WriteHeader(http.StatusNoContent)
+			return
+		}
+
+		// Proceed with the next handler
+		next.ServeHTTP(w, r)
+	})
+}
+
+func (s *Server) HelloWorldHandler(w http.ResponseWriter, r *http.Request) {
+	resp := map[string]string{"message": "Hello World"}
+	jsonResp, err := json.Marshal(resp)
+	if err != nil {
+		http.Error(w, "Failed to marshal response", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	if _, err := w.Write(jsonResp); err != nil {
+		log.Printf("Failed to write response: %v", err)
+	}
+}
+
+func (s *Server) healthHandler(w http.ResponseWriter, r *http.Request) {
+	resp, err := json.Marshal(s.db.Health())
+	if err != nil {
+		http.Error(w, "Failed to marshal health check response", http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	if _, err := w.Write(resp); err != nil {
+		log.Printf("Failed to write response: %v", err)
+	}
+}

internal/server/routes_test.go

@@ -0,0 +1,31 @@
+package server
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHandler(t *testing.T) {
+	s := &Server{}
+	server := httptest.NewServer(http.HandlerFunc(s.HelloWorldHandler))
+	defer server.Close()
+	resp, err := http.Get(server.URL)
+	if err != nil {
+		t.Fatalf("error making request to server. Err: %v", err)
+	}
+	defer resp.Body.Close()
+	// Assertions
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("expected status OK; got %v", resp.Status)
+	}
+	expected := "{\"message\":\"Hello World\"}"
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("error reading response body. Err: %v", err)
+	}
+	if expected != string(body) {
+		t.Errorf("expected response body to be %v; got %v", expected, string(body))
+	}
+}

internal/server/server.go

@@ -0,0 +1,39 @@
+package server
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	_ "github.com/joho/godotenv/autoload"
+
+	"go-htmx/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
+}