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package post
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
)
type DraftStore interface {
// Set sets the draft Post's data into the storage, keyed by the draft
// Post's ID.
Set(post Post) error
// Get returns count draft Posts, sorted id descending, offset by the
// given page number. The returned boolean indicates if there are more pages
// or not.
Get(page, count int) ([]Post, bool, error)
// GetByID will return the draft Post with the given ID, or ErrPostNotFound.
GetByID(id string) (Post, error)
// Delete will delete the draft Post with the given ID.
Delete(id string) error
}
type draftStore struct {
db *SQLDB
}
// NewDraftStore initializes a new DraftStore using an existing SQLDB.
func NewDraftStore(db *SQLDB) DraftStore {
return &draftStore{
db: db,
}
}
func (s *draftStore) Set(post Post) error {
if post.ID == "" {
return errors.New("post ID can't be empty")
}
tagsJSON, err := json.Marshal(post.Tags)
if err != nil {
return fmt.Errorf("json marshaling tags %#v: %w", post.Tags, err)
}
_, err = s.db.db.Exec(
`INSERT INTO post_drafts (
id, title, description, tags, series, body
)
VALUES
(?, ?, ?, ?, ?, ?)
ON CONFLICT (id) DO UPDATE SET
title=excluded.title,
description=excluded.description,
tags=excluded.tags,
series=excluded.series,
body=excluded.body`,
post.ID,
post.Title,
&sql.NullString{String: post.Description, Valid: len(post.Description) > 0},
&sql.NullString{String: string(tagsJSON), Valid: len(post.Tags) > 0},
&sql.NullString{String: post.Series, Valid: post.Series != ""},
post.Body,
)
if err != nil {
return fmt.Errorf("inserting into post_drafts: %w", err)
}
return nil
}
func (s *draftStore) get(
querier interface {
Query(string, ...interface{}) (*sql.Rows, error)
},
limit, offset int,
where string, whereArgs ...interface{},
) (
[]Post, error,
) {
query := `
SELECT
p.id, p.title, p.description, p.tags, p.series, p.body
FROM post_drafts p
` + where + `
ORDER BY p.id ASC`
if limit > 0 {
query += fmt.Sprintf(" LIMIT %d", limit)
}
if offset > 0 {
query += fmt.Sprintf(" OFFSET %d", offset)
}
rows, err := querier.Query(query, whereArgs...)
if err != nil {
return nil, fmt.Errorf("selecting: %w", err)
}
defer rows.Close()
var posts []Post
for rows.Next() {
var (
post Post
description, tags, series sql.NullString
)
err := rows.Scan(
&post.ID, &post.Title, &description, &tags, &series,
&post.Body,
)
if err != nil {
return nil, fmt.Errorf("scanning row: %w", err)
}
post.Description = description.String
post.Series = series.String
if tags.String != "" {
if err := json.Unmarshal([]byte(tags.String), &post.Tags); err != nil {
return nil, fmt.Errorf("json parsing %q: %w", tags.String, err)
}
}
posts = append(posts, post)
}
return posts, nil
}
func (s *draftStore) Get(page, count int) ([]Post, bool, error) {
posts, err := s.get(s.db.db, count+1, page*count, ``)
if err != nil {
return nil, false, fmt.Errorf("querying post_drafts: %w", err)
}
var hasMore bool
if len(posts) > count {
hasMore = true
posts = posts[:count]
}
return posts, hasMore, nil
}
func (s *draftStore) GetByID(id string) (Post, error) {
posts, err := s.get(s.db.db, 0, 0, `WHERE p.id=?`, id)
if err != nil {
return Post{}, fmt.Errorf("querying post_drafts: %w", err)
}
if len(posts) == 0 {
return Post{}, ErrPostNotFound
}
if len(posts) > 1 {
panic(fmt.Sprintf("got back multiple draft posts querying id %q: %+v", id, posts))
}
return posts[0], nil
}
func (s *draftStore) Delete(id string) error {
if _, err := s.db.db.Exec(`DELETE FROM post_drafts WHERE id = ?`, id); err != nil {
return fmt.Errorf("deleting from post_drafts: %w", err)
}
return nil
}
|
