perf: cache public gallery views

server-rs/crates/spacetime-module/src/visual_novel.rs

@@ -1,6 +1,7 @@
 use crate::*;
 use serde::Serialize;
 use serde::de::DeserializeOwned;
+use spacetimedb::AnonymousViewContext;
 
 pub const VISUAL_NOVEL_SOURCE_IDEA: &str = "idea";
 pub const VISUAL_NOVEL_SOURCE_DOCUMENT: &str = "document";
@@ -166,6 +167,58 @@ pub struct VisualNovelRuntimeEvent {
     pub(crate) occurred_at: Timestamp,
 }
 
+/// 视觉小说公开广场列表投影。
+///
+/// 该 view 只暴露已发布作品卡片需要的公开字段，HTTP gallery 订阅后
+/// 从本地 cache 读取，避免每个列表请求调用 `list_visual_novel_works` procedure。
+#[spacetimedb::view(accessor = visual_novel_gallery_view, public)]
+pub fn visual_novel_gallery_view(ctx: &AnonymousViewContext) -> Vec<VisualNovelGalleryViewRow> {
+    let mut items = ctx
+        .db
+        .visual_novel_work_profile()
+        .by_visual_novel_work_publication_status()
+        .filter(VISUAL_NOVEL_PUBLICATION_PUBLISHED)
+        .filter_map(|row| match build_gallery_view_row(&row) {
+            Ok(item) => Some(item),
+            Err(error) => {
+                log::warn!(
+                    "视觉小说公开广场 view 跳过损坏的作品投影 profile_id={}: {}",
+                    row.profile_id,
+                    error
+                );
+                None
+            }
+        })
+        .collect::<Vec<_>>();
+    items.sort_by(|left, right| {
+        right
+            .updated_at_micros
+            .cmp(&left.updated_at_micros)
+            .then_with(|| left.profile_id.cmp(&right.profile_id))
+    });
+    items
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, SpacetimeType)]
+pub struct VisualNovelGalleryViewRow {
+    pub work_id: String,
+    pub profile_id: String,
+    pub owner_user_id: String,
+    pub source_session_id: Option<String>,
+    pub author_display_name: String,
+    pub work_title: String,
+    pub work_description: String,
+    pub tags: Vec<String>,
+    pub cover_image_src: Option<String>,
+    pub source_asset_ids: Vec<String>,
+    pub publication_status: String,
+    pub publish_ready: bool,
+    pub play_count: u32,
+    pub created_at_micros: i64,
+    pub updated_at_micros: i64,
+    pub published_at_micros: Option<i64>,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, SpacetimeType)]
 pub struct VisualNovelAgentSessionCreateInput {
     pub session_id: String,
@@ -1445,6 +1498,31 @@ fn build_work_snapshot(row: &VisualNovelWorkProfileRow) -> Result<VisualNovelWor
     })
 }
 
+fn build_gallery_view_row(
+    row: &VisualNovelWorkProfileRow,
+) -> Result<VisualNovelGalleryViewRow, String> {
+    Ok(VisualNovelGalleryViewRow {
+        work_id: row.work_id.clone(),
+        profile_id: row.profile_id.clone(),
+        owner_user_id: row.owner_user_id.clone(),
+        source_session_id: empty_to_none(&row.source_session_id),
+        author_display_name: row.author_display_name.clone(),
+        work_title: row.work_title.clone(),
+        work_description: row.work_description.clone(),
+        tags: parse_string_vec_or_empty(&row.tags_json)?,
+        cover_image_src: empty_to_none(&row.cover_image_src),
+        source_asset_ids: parse_string_vec_or_empty(&row.source_asset_ids_json)?,
+        publication_status: row.publication_status.clone(),
+        publish_ready: row.publish_ready,
+        play_count: row.play_count,
+        created_at_micros: row.created_at.to_micros_since_unix_epoch(),
+        updated_at_micros: row.updated_at.to_micros_since_unix_epoch(),
+        published_at_micros: row
+            .published_at
+            .map(|value| value.to_micros_since_unix_epoch()),
+    })
+}
+
 fn build_run_snapshot(
     ctx: &ReducerContext,
     row: &VisualNovelRuntimeRunRow,