xfy
8da678b3b4
文章写操作后总要一起失效 lists/tags/stats/search 四项元数据缓存。 新增 invalidate_post_metadata() 封装这个固定组合，替换 create/delete/ update/trash 中的 8 处重复 4 行序列。 保留定向失效（invalidate_post_by_slug / invalidate_tag_posts_for） 和批量回退路径（invalidate_all_post_caches + invalidate_search_results） 的显式调用——它们是按实际涉及数据细粒度控制的，不应被封装吞掉。
219 lines
8.0 KiB
Rust
219 lines
8.0 KiB
Rust
//! 更新文章接口。
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//!
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//! 校验管理员权限与文章归属，重新生成唯一 slug、渲染 Markdown，
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//! 在事务中更新 posts 表并同步标签，最后失效相关缓存。
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//! Dioxus server function，注册在 `/api` 路径下。
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//! 仅在 `feature = "server"` 启用的服务端构建中写入数据库。
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#![allow(clippy::too_many_arguments)]
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use dioxus::prelude::*;
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#[cfg(feature = "server")]
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use super::helpers::{clean_tags, get_current_admin_user, sync_tags};
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use super::types::CreatePostResponse;
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#[cfg(feature = "server")]
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use crate::api::error::AppError;
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#[cfg(feature = "server")]
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use crate::db::pool::get_conn;
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#[cfg(feature = "server")]
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use crate::models::post::PostStatus;
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/// 更新指定文章。
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///
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/// 校验文章存在且属于当前 admin；处理 slug 变更、发布状态转换、标签同步，
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/// 并失效文章详情、列表、标签与统计缓存。
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#[server(UpdatePost, "/api")]
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pub async fn update_post(
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post_id: i32,
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title: String,
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slug: Option<String>,
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summary: Option<String>,
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content_md: String,
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status: String,
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tags: Vec<String>,
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cover_image: Option<String>,
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) -> Result<CreatePostResponse, ServerFnError> {
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let user = get_current_admin_user().await?;
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#[cfg(feature = "server")]
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{
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let mut client = get_conn().await.map_err(AppError::db_conn)?;
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// Markdown 渲染移到阻塞线程池执行。
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let md_for_render = content_md.clone();
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let rendered = tokio::task::spawn_blocking(move || {
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crate::api::markdown::render_markdown_enhanced(&md_for_render)
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})
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.await
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.map_err(|_| AppError::Internal("Markdown 渲染任务失败"))?;
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let content_html = rendered.html;
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let toc_html = if rendered.toc_html.is_empty() {
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None::<String>
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} else {
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Some(rendered.toc_html)
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};
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// 未填写摘要时自动从正文提取。
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let summary = summary
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.filter(|s| !s.trim().is_empty())
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.unwrap_or_else(|| crate::utils::text::auto_summary(&content_md));
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let post_status = PostStatus::from_str(&status).unwrap_or(PostStatus::Draft);
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let cover_image = cover_image.filter(|s| !s.trim().is_empty());
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// 重新计算字数与阅读时长，保持与正文同步。
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let word_count = crate::utils::text::count_words(&content_md);
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let reading_time = crate::utils::text::reading_time(word_count);
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let tx = client.transaction().await.map_err(AppError::tx)?;
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// 查询旧 slug，用于后续缓存失效。
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let old_slug: Option<String> = tx
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.query_opt("SELECT slug FROM posts WHERE id = $1", &[&post_id])
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.await
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.map_err(AppError::query)?
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.map(|r| r.get(0));
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// 校验文章存在、未删除且归属当前用户。
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let exists: bool = tx
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.query_opt(
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"SELECT 1 FROM posts WHERE id = $1 AND author_id = $2 AND deleted_at IS NULL",
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&[&post_id, &user.id],
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)
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.await
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.map_err(AppError::query)?
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.is_some();
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if !exists {
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return Ok(CreatePostResponse::err("文章不存在或无权限".to_string()));
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}
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// 确定基础 slug：用户传入时校验格式，否则由标题生成。
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let base_slug = match slug {
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Some(ref s) if !s.trim().is_empty() => {
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let s = s.trim();
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if !crate::api::slug::is_valid_slug(s) {
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return Ok(CreatePostResponse::err("slug 格式无效".to_string()));
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}
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s.to_string()
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}
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_ => crate::api::slug::slugify(&title),
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};
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// 保证 slug 全局唯一，排除当前文章自身；在事务内检查避免并发竞态。
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let final_slug =
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crate::api::slug::ensure_unique_slug(&tx, &base_slug, Some(post_id)).await?;
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// 获取文章旧标签，用于后续失效标签缓存。
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let old_tags: Vec<String> = {
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let rows = tx
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.query(
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"SELECT t.name FROM tags t JOIN post_tags pt ON t.id = pt.tag_id WHERE pt.post_id = $1",
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&[&post_id],
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)
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.await
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.map_err(AppError::query)?;
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rows.iter().map(|r| r.get(0)).collect()
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};
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// 获取旧状态与旧发布时间，用于决定是否需要更新 published_at。
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let old_status_row = tx
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.query_opt(
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"SELECT status, published_at FROM posts WHERE id = $1",
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&[&post_id],
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)
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.await
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.map_err(AppError::query)?;
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// 发布时：若之前已发布则保留原时间，否则使用当前时间。
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// 非发布时：保留原有 published_at（若为草稿可能为 None）。
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let published_at = if post_status == PostStatus::Published {
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let was_published = old_status_row
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.as_ref()
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.map(|r| {
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let s: String = r.get(0);
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s == "published"
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})
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.unwrap_or(false);
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let existing_published: Option<chrono::DateTime<chrono::Utc>> =
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old_status_row.as_ref().and_then(|r| r.get(1));
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if was_published {
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existing_published
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} else {
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Some(chrono::Utc::now())
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}
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} else {
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old_status_row.and_then(|r| r.get(1))
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};
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// 更新文章主表。
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let updated = tx
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.execute(
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"UPDATE posts SET title = $1, slug = $2, summary = $3, content_md = $4, content_html = $5, toc_html = $6, status = $7, published_at = $8, cover_image = $9, word_count = $10, reading_time = $11, updated_at = NOW()
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WHERE id = $12",
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&[
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&title.trim(),
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&final_slug,
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&summary,
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&content_md,
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&content_html,
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&toc_html,
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&post_status.as_str(),
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&published_at,
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&cover_image,
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&(word_count as i32),
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&(reading_time as i32),
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&post_id,
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],
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)
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.await
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.map_err(AppError::tx)?;
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if updated == 0 {
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return Ok(CreatePostResponse::err("文章不存在或无权限".to_string()));
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}
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let tags_cleaned = clean_tags(&tags);
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let tags_for_invalidation = tags_cleaned.clone();
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// 先清除旧标签关联，再重新同步新标签。
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tx.execute("DELETE FROM post_tags WHERE post_id = $1", &[&post_id])
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.await
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.map_err(AppError::tx)?;
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sync_tags(&tx, post_id, &tags_cleaned).await?;
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tx.commit().await.map_err(AppError::tx)?;
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// 失效文章列表、标签、当前 slug 与统计缓存。
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crate::cache::invalidate_post_metadata();
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crate::cache::invalidate_post_by_slug(&final_slug).await;
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// 合并旧标签与新标签，统一失效标签下的文章列表缓存。
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let all_tags_to_invalidate: Vec<String> = old_tags
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.into_iter()
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.chain(tags_for_invalidation.into_iter())
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.collect::<std::collections::HashSet<_>>()
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.into_iter()
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.collect();
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crate::cache::invalidate_tag_posts_for(&all_tags_to_invalidate).await;
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// 若 slug 发生变更，额外失效旧 slug 缓存。
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if let Some(ref old) = old_slug {
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if old != &final_slug {
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crate::cache::invalidate_post_by_slug(old).await;
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}
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}
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// 递增 SSR 全局世代号（未来就绪基础设施；当前不会使 Dioxus 0.7 SSR 缓存失效）。
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crate::ssr_cache::bump_global_generation();
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Ok(CreatePostResponse::ok("更新成功".to_string(), post_id, final_slug))
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}
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#[cfg(not(feature = "server"))]
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{
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Ok(CreatePostResponse::err("server only".to_string()))
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}
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}
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