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postgres.go
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postgres.go
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package postgres
import (
"context"
"errors"
"fmt"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/pgconn"
"github.com/jackc/pgx/v5/pgxpool"
"github.com/gaydin/journey/date"
"github.com/gaydin/journey/store/postgres/migrate"
"github.com/gaydin/journey/structure"
)
type Storage struct {
pool *pgxpool.Pool
}
func New(dsn string) (*Storage, error) {
pgxPool, err := connect(dsn)
if err != nil {
return nil, err
}
store := &Storage{
pool: pgxPool,
}
if err = store.checkBlogSettings(context.Background()); err != nil {
return nil, err
}
return store, nil
}
func connect(dsn string) (*pgxpool.Pool, error) {
config, err := pgxpool.ParseConfig(dsn)
if err != nil {
return nil, fmt.Errorf("ParseConfig err: %w", err)
}
pgxPool, err := pgxpool.NewWithConfig(context.Background(), config)
if err != nil {
return nil, fmt.Errorf("ConnectConfig err: %w", err)
}
if err := migrate.Migrate(pgxPool); err != nil {
return nil, fmt.Errorf("migrate fail: %w", err)
}
return pgxPool, nil
}
// Function to check and insert any missing blog settings into the database (settings could be missing if migrating from Ghost).
func (s *Storage) checkBlogSettings(ctx context.Context) error {
const stmtRetrieveBlog = "SELECT value FROM settings WHERE key = $1"
var tempBlog structure.Blog
err := s.pool.QueryRow(ctx, stmtRetrieveBlog, "title").Scan(&tempBlog.Title)
if err != nil {
err = s.insertSettingString(ctx, "title", "My Blog", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "description").Scan(&tempBlog.Description)
if err != nil {
err = s.insertSettingString(ctx, "description", "Just another Blog", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
var email []byte
err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "email").Scan(&email)
if err != nil {
err = s.insertSettingString(ctx, "email", "", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "logo").Scan(&tempBlog.Logo)
if err != nil {
err = s.insertSettingString(ctx, "logo", "/public/images/blog-logo.jpg", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "cover").Scan(&tempBlog.Cover)
if err != nil {
err = s.insertSettingString(ctx, "cover", "/public/images/blog-cover.jpg", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
var postsPerPage string
if err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "postsPerPage").Scan(&postsPerPage); errors.Is(err, pgx.ErrNoRows) {
err = s.insertSettingString(ctx, "postsPerPage", "5", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "activeTheme").Scan(&tempBlog.ActiveTheme)
if err != nil {
err = s.insertSettingString(ctx, "activeTheme", "promenade", "theme", date.GetCurrentTime())
if err != nil {
return err
}
}
var navigation []byte
err = s.pool.QueryRow(ctx, stmtRetrieveBlog, "navigation").Scan(&navigation)
if err != nil {
err = s.insertSettingString(ctx, "navigation", "[{\"label\":\"Home\", \"url\":\"/\"}]", "blog", date.GetCurrentTime())
if err != nil {
return err
}
}
return nil
}
func (s *Storage) Tx(ctx context.Context, fn func(ctx context.Context, tx pgx.Tx, s *Storage) error) error {
transaction, err := s.pool.BeginTx(ctx, pgx.TxOptions{})
if err != nil {
return fmt.Errorf("begin tx %w", err)
}
defer func() {
if err != nil {
_ = transaction.Rollback(ctx)
} else {
err = transaction.Commit(ctx)
}
}()
err = fn(ctx, transaction, s)
return err
}
func execError(_ pgconn.CommandTag, err error) error {
return err
}