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-rw-r--r--srv/src/post/draft_post.go186
1 files changed, 186 insertions, 0 deletions
diff --git a/srv/src/post/draft_post.go b/srv/src/post/draft_post.go
new file mode 100644
index 0000000..af52965
--- /dev/null
+++ b/srv/src/post/draft_post.go
@@ -0,0 +1,186 @@
+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,
+ post.Description,
+ &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
+ 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
+ tags, series sql.NullString
+ )
+
+ err := rows.Scan(
+ &post.ID, &post.Title, &post.Description, &tags, &series,
+ &post.Body,
+ )
+
+ if err != nil {
+ return nil, fmt.Errorf("scanning row: %w", err)
+ }
+
+ 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
+}