Masahiko AMANO
a2823337b6
Previous version of Tanabata used as visual and functional reference for the new Go + SvelteKit rewrite. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package postgres
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/jackc/pgx/v5"
|
|
"github.com/jackc/pgx/v5/pgconn"
|
|
"github.com/jackc/pgx/v5/pgxpool"
|
|
)
|
|
|
|
type Storage struct {
|
|
db *pgxpool.Pool
|
|
}
|
|
|
|
var connPool *pgxpool.Pool
|
|
|
|
// Initialize new database storage
|
|
func New(dbURL string) (*Storage, error) {
|
|
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
|
defer cancel()
|
|
config, err := pgxpool.ParseConfig(dbURL)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to parse DB URL: %w", err)
|
|
}
|
|
config.MaxConns = 10
|
|
config.MinConns = 2
|
|
config.HealthCheckPeriod = time.Minute
|
|
db, err := pgxpool.NewWithConfig(ctx, config)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to connect to database: %w", err)
|
|
}
|
|
err = db.Ping(ctx)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("database ping failed: %w", err)
|
|
}
|
|
return &Storage{db: db}, nil
|
|
}
|
|
|
|
// Close database storage
|
|
func (s *Storage) Close() {
|
|
s.db.Close()
|
|
}
|
|
|
|
// Run handler inside transaction
|
|
func (s *Storage) transaction(ctx context.Context, handler func(context.Context, pgx.Tx) (statusCode int, err error)) (statusCode int, err error) {
|
|
tx, err := connPool.Begin(ctx)
|
|
if err != nil {
|
|
statusCode = http.StatusInternalServerError
|
|
return
|
|
}
|
|
statusCode, err = handler(ctx, tx)
|
|
if err != nil {
|
|
tx.Rollback(ctx)
|
|
return
|
|
}
|
|
err = tx.Commit(ctx)
|
|
if err != nil {
|
|
statusCode = http.StatusInternalServerError
|
|
}
|
|
return
|
|
}
|
|
|
|
// Handle database error
|
|
func (s *Storage) handleDBError(errIn error) (statusCode int, err error) {
|
|
if errIn == nil {
|
|
statusCode = http.StatusOK
|
|
return
|
|
}
|
|
if errors.Is(errIn, pgx.ErrNoRows) {
|
|
err = fmt.Errorf("not found")
|
|
statusCode = http.StatusNotFound
|
|
return
|
|
}
|
|
var pgErr *pgconn.PgError
|
|
if errors.As(errIn, &pgErr) {
|
|
switch pgErr.Code {
|
|
case "22P02", "22007": // Invalid data format
|
|
err = fmt.Errorf("%s", pgErr.Message)
|
|
statusCode = http.StatusBadRequest
|
|
return
|
|
case "23505": // Unique constraint violation
|
|
err = fmt.Errorf("already exists")
|
|
statusCode = http.StatusConflict
|
|
return
|
|
}
|
|
}
|
|
return http.StatusInternalServerError, errIn
|
|
}
|