172 lines
3.3 KiB
Go
172 lines
3.3 KiB
Go
package link
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import (
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"context"
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"errors"
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"github.com/jackc/pgtype"
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"github.com/jackc/pgx/v4"
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"github.com/jackc/pgx/v4/pgxpool"
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"net/url"
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"time"
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)
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const defaultContextTimeout = 10 * time.Second
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type Repository interface {
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Save(link *Link) error
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FindById(id string) (*Link, error)
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FindAll(limit int, offset int) (Links, error)
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Update(link *Link) error
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DeleteById(id string) error
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}
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type PgRepository struct {
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pool *pgxpool.Pool
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}
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func (r *PgRepository) Save(link *Link) error {
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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defer cancel()
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sql := `
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INSERT INTO links (id, name, redirect_url, creation_time)
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VALUES ($1, $2, $3, $4::timestamp)
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`
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_, err := r.pool.Exec(ctx, sql, link.Id, link.Name, link.RedirectURL.String(), link.CreationTime.Format("2006-01-02 15:04:05"))
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if err != nil {
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return err
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}
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return nil
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}
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func (r *PgRepository) FindById(id string) (*Link, error) {
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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defer cancel()
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sql := `
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SELECT id, name, redirect_url, creation_time
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FROM links
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WHERE id = $1
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`
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entity, err := mapRowToEntity(r.pool.QueryRow(ctx, sql, id))
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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return nil, nil
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} else {
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return nil, err
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}
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}
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return entity, nil
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}
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func (r *PgRepository) FindAll(limit int, offset int) (Links, error) {
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if limit < 0 {
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return nil, errors.New("limit can't be negative")
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}
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if offset < 0 {
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return nil, errors.New("offset can't be negative")
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}
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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defer cancel()
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sql := `
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SELECT id, name, redirect_url, creation_time
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FROM links
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LIMIT $1
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OFFSET $2
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`
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rows, err := r.pool.Query(ctx, sql, limit, offset)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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links := make(Links, 0)
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for rows.Next() {
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link, err := mapRowToEntity(rows)
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if err != nil {
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return nil, err
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}
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links = append(links, link)
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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return links, nil
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}
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func (r *PgRepository) Update(link *Link) error {
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if link.Id == "" {
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return errors.New("link ID must not be empty")
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}
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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defer cancel()
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sql := `
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UPDATE links
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SET name = $1, redirect_url = $2
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WHERE id = $3
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`
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_, err := r.pool.Exec(ctx, sql, link.Name, link.RedirectURL.String(), link.Id)
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if err != nil {
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return err
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}
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return nil
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}
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func (r *PgRepository) DeleteById(id string) error {
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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defer cancel()
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sql := `
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DELETE FROM links WHERE id = $1
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`
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_, err := r.pool.Exec(ctx, sql, id)
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if err != nil {
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return err
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}
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return nil
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}
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func mapRowToEntity(r interface{}) (*Link, error) {
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var entity Link
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var urlStr string
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var t pgtype.Timestamp
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switch v := r.(type) {
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case pgx.Row:
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if err := v.Scan(&entity.Id, &entity.Name, &urlStr, &t); err != nil {
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return nil, err
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}
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case pgx.Rows:
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if err := v.Scan(&entity.Id, &entity.Name, &urlStr, &t); err != nil {
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return nil, err
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}
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default:
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return nil, errors.New("unsupported type")
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}
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u, err := url.Parse(urlStr)
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if err != nil {
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return nil, err
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}
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entity.RedirectURL = *u
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entity.CreationTime = t.Time
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return &entity, nil
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}
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