feat: add frontend + backend + database to retrieve and compute news from Yahoo

backend/internal/database/db.go

@@ -0,0 +1,43 @@
+package database
+
+import (
+	"database/sql"
+	"fmt"
+
+	"github.com/golang-migrate/migrate/v4"
+	"github.com/golang-migrate/migrate/v4/database/postgres"
+	_ "github.com/golang-migrate/migrate/v4/source/file"
+	_ "github.com/lib/pq"
+)
+
+func Connect(databaseURL string) (*sql.DB, error) {
+	db, err := sql.Open("postgres", databaseURL)
+	if err != nil {
+		return nil, fmt.Errorf("open db: %w", err)
+	}
+	if err := db.Ping(); err != nil {
+		return nil, fmt.Errorf("ping db: %w", err)
+	}
+	db.SetMaxOpenConns(25)
+	db.SetMaxIdleConns(5)
+	return db, nil
+}
+
+func RunMigrations(db *sql.DB) error {
+	driver, err := postgres.WithInstance(db, &postgres.Config{})
+	if err != nil {
+		return fmt.Errorf("migration driver: %w", err)
+	}
+	m, err := migrate.NewWithDatabaseInstance(
+		"file://internal/database/migrations",
+		"postgres",
+		driver,
+	)
+	if err != nil {
+		return fmt.Errorf("migrate init: %w", err)
+	}
+	if err := m.Up(); err != nil && err != migrate.ErrNoChange {
+		return fmt.Errorf("migrate up: %w", err)
+	}
+	return nil
+}