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|
package db
import (
"database/sql"
"encoding/json"
"time"
)
type PostRecord struct {
Slug string
Title string
Date string
Tags []string
Draft bool
Blocks string // raw EditorJS JSON
UpdatedAt int64 // Unix microseconds
}
// UpsertPost inserts or updates a post record.
func (m *MetaDB) UpsertPost(p PostRecord) error {
tags, _ := json.Marshal(p.Tags)
draft := 0
if p.Draft {
draft = 1
}
_, err := m.db.Exec(`
INSERT INTO posts (slug, title, date, tags, draft, blocks, updated_at)
VALUES (?, ?, ?, ?, ?, ?, ?)
ON CONFLICT(slug) DO UPDATE SET
title = excluded.title,
date = excluded.date,
tags = excluded.tags,
draft = excluded.draft,
blocks = excluded.blocks,
updated_at = excluded.updated_at
`, p.Slug, p.Title, p.Date, string(tags), draft, p.Blocks, p.UpdatedAt)
return err
}
// GetPost retrieves a single post by slug.
func (m *MetaDB) GetPost(slug string) (*PostRecord, error) {
row := m.db.QueryRow(
`SELECT slug, title, date, tags, draft, blocks, updated_at FROM posts WHERE slug = ?`, slug)
var p PostRecord
var tagsJSON string
var draft int
if err := row.Scan(&p.Slug, &p.Title, &p.Date, &tagsJSON, &draft, &p.Blocks, &p.UpdatedAt); err != nil {
return nil, err
}
p.Draft = draft != 0
_ = json.Unmarshal([]byte(tagsJSON), &p.Tags)
if p.Tags == nil {
p.Tags = []string{}
}
return &p, nil
}
// ListPosts returns all posts, optionally including drafts.
func (m *MetaDB) ListPosts(includeDrafts bool) ([]PostRecord, error) {
query := `SELECT slug, title, date, tags, draft, blocks, updated_at FROM posts`
if !includeDrafts {
query += ` WHERE draft = 0`
}
query += ` ORDER BY date DESC, slug`
rows, err := m.db.Query(query)
if err != nil {
return nil, err
}
defer rows.Close()
return scanPosts(rows)
}
// DeletePost removes a post by slug.
func (m *MetaDB) DeletePost(slug string) error {
_, err := m.db.Exec(`DELETE FROM posts WHERE slug = ?`, slug)
return err
}
func scanPosts(rows *sql.Rows) ([]PostRecord, error) {
var posts []PostRecord
for rows.Next() {
var p PostRecord
var tagsJSON string
var draft int
if err := rows.Scan(&p.Slug, &p.Title, &p.Date, &tagsJSON, &draft, &p.Blocks, &p.UpdatedAt); err != nil {
return nil, err
}
p.Draft = draft != 0
_ = json.Unmarshal([]byte(tagsJSON), &p.Tags)
if p.Tags == nil {
p.Tags = []string{}
}
posts = append(posts, p)
}
return posts, rows.Err()
}
// DB returns the underlying *sql.DB for advanced queries (e.g., transaction handling).
func (m *MetaDB) DB() *sql.DB {
return m.db
}
// GetPostRawPath returns the path for indexing in the search database.
func (p *PostRecord) GetPostRawPath() string {
return "/" + p.Slug
}
// GetUpdatedTime returns the updated_at as a time.Time for comparison.
func (p *PostRecord) GetUpdatedTime() time.Time {
return time.UnixMicro(p.UpdatedAt).UTC()
}
// AddRedirect inserts or replaces a redirect from fromSlug to toSlug.
func (m *MetaDB) AddRedirect(fromSlug, toSlug string) error {
_, err := m.db.Exec(
`INSERT INTO redirects (from_slug, to_slug) VALUES (?, ?)
ON CONFLICT(from_slug) DO UPDATE SET to_slug = excluded.to_slug`,
fromSlug, toSlug,
)
return err
}
// GetRedirect returns the slug that fromSlug redirects to, or sql.ErrNoRows if none.
func (m *MetaDB) GetRedirect(fromSlug string) (string, error) {
var toSlug string
err := m.db.QueryRow(
`SELECT to_slug FROM redirects WHERE from_slug = ?`, fromSlug,
).Scan(&toSlug)
return toSlug, err
}
// CollapseRedirects updates all redirects pointing to oldSlug so they point to newSlug instead,
// preventing redirect chains when a slug is renamed again.
func (m *MetaDB) CollapseRedirects(oldSlug, newSlug string) error {
_, err := m.db.Exec(
`UPDATE redirects SET to_slug = ? WHERE to_slug = ?`, newSlug, oldSlug,
)
return err
}
// RenamePost atomically renames a post from oldSlug to newSlug,
// updates any existing redirect chains, and adds a redirect from oldSlug to newSlug.
func (m *MetaDB) RenamePost(oldSlug, newSlug string) error {
if oldSlug == newSlug {
return nil
}
tx, err := m.db.Begin()
if err != nil {
return err
}
defer tx.Rollback()
// Fetch existing record
var p PostRecord
var tagsJSON string
var draft int
row := tx.QueryRow(
`SELECT slug, title, date, tags, draft, blocks, updated_at FROM posts WHERE slug = ?`, oldSlug)
if err := row.Scan(&p.Slug, &p.Title, &p.Date, &tagsJSON, &draft, &p.Blocks, &p.UpdatedAt); err != nil {
return err
}
p.Draft = draft != 0
_ = json.Unmarshal([]byte(tagsJSON), &p.Tags)
// Insert with new slug
tags, _ := json.Marshal(p.Tags)
draftInt := 0
if p.Draft {
draftInt = 1
}
_, err = tx.Exec(`
INSERT INTO posts (slug, title, date, tags, draft, blocks, updated_at)
VALUES (?, ?, ?, ?, ?, ?, ?)`,
newSlug, p.Title, p.Date, string(tags), draftInt, p.Blocks, p.UpdatedAt,
)
if err != nil {
return err
}
// Delete old record
if _, err = tx.Exec(`DELETE FROM posts WHERE slug = ?`, oldSlug); err != nil {
return err
}
// Collapse existing redirect chains: anything pointing to oldSlug now points to newSlug
if _, err = tx.Exec(
`UPDATE redirects SET to_slug = ? WHERE to_slug = ?`, newSlug, oldSlug,
); err != nil {
return err
}
// Add redirect from oldSlug to newSlug
if _, err = tx.Exec(`
INSERT INTO redirects (from_slug, to_slug) VALUES (?, ?)
ON CONFLICT(from_slug) DO UPDATE SET to_slug = excluded.to_slug`,
oldSlug, newSlug,
); err != nil {
return err
}
return tx.Commit()
}
// RenameAndUpsertPost atomically renames a post from oldSlug to p.Slug and
// updates its content, collapsing any redirect chains and adding a redirect
// from oldSlug to p.Slug — all in a single transaction.
func (m *MetaDB) RenameAndUpsertPost(oldSlug string, p PostRecord) error {
if oldSlug == p.Slug {
return m.UpsertPost(p)
}
tx, err := m.db.Begin()
if err != nil {
return err
}
defer tx.Rollback()
tags, _ := json.Marshal(p.Tags)
draftInt := 0
if p.Draft {
draftInt = 1
}
// Insert new record with updated content
if _, err = tx.Exec(`
INSERT INTO posts (slug, title, date, tags, draft, blocks, updated_at)
VALUES (?, ?, ?, ?, ?, ?, ?)`,
p.Slug, p.Title, p.Date, string(tags), draftInt, p.Blocks, p.UpdatedAt,
); err != nil {
return err
}
// Delete old record
if _, err = tx.Exec(`DELETE FROM posts WHERE slug = ?`, oldSlug); err != nil {
return err
}
// Collapse existing redirect chains
if _, err = tx.Exec(
`UPDATE redirects SET to_slug = ? WHERE to_slug = ?`, p.Slug, oldSlug,
); err != nil {
return err
}
// Add redirect from oldSlug to new slug
if _, err = tx.Exec(`
INSERT INTO redirects (from_slug, to_slug) VALUES (?, ?)
ON CONFLICT(from_slug) DO UPDATE SET to_slug = excluded.to_slug`,
oldSlug, p.Slug,
); err != nil {
return err
}
return tx.Commit()
}
|
