init project

internal/database/database.go

@@ -0,0 +1,148 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+	_ "github.com/joho/godotenv/autoload"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+type Services interface {
+	Health() map[string]string
+	GetDB(string) *gorm.DB
+}
+
+type service struct {
+	simrsDB    *gorm.DB
+	satuDataDB *gorm.DB
+}
+
+var (
+	hostSimrs     = os.Getenv("SIMRS_STAG_HOST")
+	userNameSimrs = os.Getenv("SIMRS_STAG_USER")
+	passwordSimrs = os.Getenv("SIMRS_STAG_PASS")
+	dbNameSimrs   = os.Getenv("SIMRS_STAG_NAME")
+	portSimrs     = os.Getenv("SIMRS_STAG_PORT")
+
+	hostSatuData     = os.Getenv("SATUDATA_HOST")
+	userNameSatuData = os.Getenv("SATUDATA_USERNAME")
+	passwordSatuData = os.Getenv("SATUDATA_PASSWORD")
+	dbNameSatuData   = os.Getenv("SATUDATA_NAME")
+	portSatuData     = os.Getenv("SATUDATA_PORT")
+
+	dbInstance *service
+)
+
+func New() Services {
+	// Reuse Connection
+	if dbInstance != nil {
+		return dbInstance
+	}
+	simrs := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%s sslmode=disable TimeZone=Asia/Jakarta", hostSimrs, userNameSimrs, passwordSimrs, dbNameSimrs, portSimrs)
+
+	SimrsDB, err := gorm.Open(postgres.Open(simrs), &gorm.Config{})
+	if err != nil {
+		log.Fatal("Failed to connect to database SIMRS: ", err)
+	} else {
+		log.Println("Successfully connected to the database SIMRS")
+	}
+	satuData := fmt.Sprintf("host=%s user=%s password=%s dbname=%s port=%s sslmode=disable TimeZone=Asia/Jakarta", hostSatuData, userNameSatuData, passwordSatuData, dbNameSatuData, portSatuData)
+
+	satuDataDB, err := gorm.Open(postgres.Open(satuData), &gorm.Config{})
+	if err != nil {
+		log.Fatal("Failed to connect to database SatuData: ", err)
+	} else {
+		log.Println("Successfully connected to the database SatuData")
+	}
+
+	mongoURI := fmt.Sprintf("mongodb://%s:%s@%s:%s/%s?authSource=admin",
+		user, pass, host, port, database)
+
+	dbInstance = &service{
+		simrsDB:    SimrsDB,
+		satuDataDB: satuDataDB,
+	}
+	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(), 10*time.Second)
+	defer cancel()
+
+	stats := make(map[string]string)
+
+	// Ping the database using GORM
+	db, err := s.simrsDB.DB() // Retrieve the underlying sql.DB instance from GORM
+	if err != nil {
+		stats["status"] = "down"
+		stats["error"] = fmt.Sprintf("failed to get sql.DB from GORM: %v", err)
+		log.Fatalf("failed to get sql.DB from GORM: %v", err) // Log the error and terminate the program
+		return stats
+	}
+
+	err = 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
+	dbStats := 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) GetDB(database string) *gorm.DB {
+	if strings.ToLower(database) == "simrs" {
+		return s.simrsDB
+	} else if strings.ToLower(database) == "satudata" {
+		return s.satuDataDB
+	}
+	log.Println("Database tidak ditemukan")
+	return nil
+}

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) 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")
+	}
+}