Add Go rewrite with Postgres 17 and Dokploy Docker Compose

Co-authored-by: Cursor <cursoragent@cursor.com>

Go/internal/db/db.go

@@ -0,0 +1,91 @@
+package db
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func Connect(ctx context.Context, databaseURL string) (*pgxpool.Pool, error) {
+	cfg, err := pgxpool.ParseConfig(databaseURL)
+	if err != nil {
+		return nil, fmt.Errorf("parse database url: %w", err)
+	}
+	cfg.MaxConns = 20
+	cfg.MinConns = 2
+	cfg.MaxConnLifetime = time.Hour
+	cfg.MaxConnIdleTime = 15 * time.Minute
+	cfg.HealthCheckPeriod = time.Minute
+
+	pool, err := pgxpool.NewWithConfig(ctx, cfg)
+	if err != nil {
+		return nil, fmt.Errorf("connect: %w", err)
+	}
+	pingCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
+	defer cancel()
+	if err := pool.Ping(pingCtx); err != nil {
+		pool.Close()
+		return nil, fmt.Errorf("ping: %w", err)
+	}
+	return pool, nil
+}
+
+func Migrate(ctx context.Context, pool *pgxpool.Pool, dir string) error {
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return fmt.Errorf("read migrations: %w", err)
+	}
+	var files []string
+	for _, e := range entries {
+		if e.IsDir() || !strings.HasSuffix(e.Name(), ".sql") {
+			continue
+		}
+		files = append(files, e.Name())
+	}
+	sort.Strings(files)
+
+	_, err = pool.Exec(ctx, `
+		CREATE TABLE IF NOT EXISTS schema_migrations (
+			filename TEXT PRIMARY KEY,
+			applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)`)
+	if err != nil {
+		return err
+	}
+
+	for _, name := range files {
+		var exists bool
+		if err := pool.QueryRow(ctx, `SELECT EXISTS(SELECT 1 FROM schema_migrations WHERE filename=$1)`, name).Scan(&exists); err != nil {
+			return err
+		}
+		if exists {
+			continue
+		}
+		body, err := os.ReadFile(filepath.Join(dir, name))
+		if err != nil {
+			return err
+		}
+		tx, err := pool.Begin(ctx)
+		if err != nil {
+			return err
+		}
+		if _, err := tx.Exec(ctx, string(body)); err != nil {
+			_ = tx.Rollback(ctx)
+			return fmt.Errorf("migration %s: %w", name, err)
+		}
+		if _, err := tx.Exec(ctx, `INSERT INTO schema_migrations (filename) VALUES ($1)`, name); err != nil {
+			_ = tx.Rollback(ctx)
+			return err
+		}
+		if err := tx.Commit(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
+}