评论实时更新:SSE 订阅文章频道,发评/编辑/删除/审核通过即时刷新打开中的页面
- internal/hub:按文章 ID 的进程内发布/订阅,信号不携带内容(未审核评论不外泄) - GET /api/comments/stream?post_id=N:SSE 长连 + 25s 心跳 + X-Accel-Buffering off - 广播点:发评论、作者编辑/删除、后台审核通过、后台删除(与公开端共享同一 hub) - 前端 EventSource 静默刷新(不亮加载态、不干扰正在输入/编辑的状态) - requestLog 的 statusRecorder 补 Flush 透传——包装器没实现 Flusher 时流式端点整体不可用
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@@ -22,6 +22,7 @@ import (
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"oneblog/internal/config"
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"oneblog/internal/httpx"
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"oneblog/internal/hub"
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"oneblog/internal/model"
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"oneblog/internal/storage"
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"oneblog/internal/store"
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@@ -32,6 +33,9 @@ type API struct {
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Store *store.Store
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Cfg *config.Config
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Sessions *Sessions
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// Hub 是评论变更广播(与公开 API 共享同一实例,main.go 装配);
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// 审核通过 / 后台删除评论时让前台打开着的页面即时刷新。
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Hub *hub.Hub
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// 文件上传的存储后端与公开域名(main.go 装配,两个 API 共享同一实例)
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Blobs storage.BlobStore
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PublicBase string
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@@ -849,6 +853,11 @@ func (a *API) adminCommentByID(w http.ResponseWriter, r *http.Request) {
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httpx.ServerError(w, err)
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return
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}
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if in.Status == "visible" && a.Hub != nil {
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if c, err := a.Store.GetComment(id); err == nil {
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a.Hub.Broadcast(c.PostID)
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}
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}
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httpx.OK(w, map[string]any{"ok": true})
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case http.MethodDelete:
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// 后台删除同样走软删(墓碑保楼层)
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@@ -860,6 +869,11 @@ func (a *API) adminCommentByID(w http.ResponseWriter, r *http.Request) {
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httpx.ServerError(w, err)
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return
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}
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if a.Hub != nil {
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if c, err := a.Store.GetComment(id); err == nil {
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a.Hub.Broadcast(c.PostID)
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}
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}
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httpx.OK(w, map[string]any{"ok": true})
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default:
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httpx.Error(w, http.StatusMethodNotAllowed, "PUT/DELETE required")
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@@ -15,6 +15,7 @@ import (
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"oneblog/internal/auth"
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"oneblog/internal/config"
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"oneblog/internal/httpx"
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"oneblog/internal/hub"
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"oneblog/internal/model"
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"oneblog/internal/ratelimit"
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"oneblog/internal/storage"
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@@ -40,6 +41,8 @@ type API struct {
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// 其余登录方式(main.go 装配,未配置的自动不开放)
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GG auth.Google
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TG auth.Telegram
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// Hub 是评论变更的进程内广播(SSE 用;与后台 admin 共享同一实例)
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Hub *hub.Hub
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// 限流(Routes 里惰性初始化):读者登录失败按 IP 计、评论写入按读者计。
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// 登录入口此前裸奔——OAuth 跳转本身难刷,但 state 校验失败、
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@@ -78,6 +81,7 @@ func (a *API) Routes() http.Handler {
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mux.HandleFunc("/api/auth/callback/google", a.googleCallback)
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mux.HandleFunc("/api/auth/telegram", a.telegramAuth)
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mux.HandleFunc("/api/comments", a.comments)
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mux.HandleFunc("/api/comments/stream", a.commentsStream)
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mux.HandleFunc("/api/comments/", a.commentSub)
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mux.HandleFunc("/api/site", a.site)
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mux.HandleFunc("/api/posts", a.listPosts)
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@@ -285,6 +285,7 @@ func (a *API) createComment(w http.ResponseWriter, r *http.Request) {
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httpx.ServerError(w, err)
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return
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}
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a.Hub.Broadcast(in.PostID)
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if rateKey != "" {
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a.commentNew.Add(rateKey) // 只计成功写入:空正文这类手滑不扣配额
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}
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@@ -390,6 +391,7 @@ func (a *API) editComment(w http.ResponseWriter, r *http.Request, id int64) {
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httpx.ServerError(w, err)
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return
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}
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a.Hub.Broadcast(updated.PostID)
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httpx.OK(w, updated)
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}
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@@ -417,6 +419,7 @@ func (a *API) deleteComment(w http.ResponseWriter, r *http.Request, id int64) {
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httpx.ServerError(w, err)
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return
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}
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a.Hub.Broadcast(c.PostID)
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httpx.OK(w, map[string]any{"ok": true})
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}
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@@ -0,0 +1,52 @@
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// 评论变更的 SSE 端点:GET /api/comments/stream?post_id=N。
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// 事件里只有「这篇文章的评论变了」——不带任何内容,前端收到后
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// 自己 refetch。这样未审核的评论内容不会经 SSE 泄给围观者。
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package api
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import (
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"fmt"
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"net/http"
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"strconv"
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"time"
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"oneblog/internal/httpx"
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)
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// commentsStream 长连推送。EventSource 断线会自动重连,所以这里
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// 只需要:连上即发注释行、25s 心跳防代理掐线、事件触发刷新。
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func (a *API) commentsStream(w http.ResponseWriter, r *http.Request) {
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postID, err := strconv.ParseInt(r.URL.Query().Get("post_id"), 10, 64)
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if err != nil || postID <= 0 {
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httpx.BadRequest(w, "post_id required")
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return
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}
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fl, ok := w.(http.Flusher)
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if !ok {
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httpx.Error(w, http.StatusInternalServerError, "streaming unsupported")
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return
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}
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w.Header().Set("Content-Type", "text/event-stream")
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w.Header().Set("Cache-Control", "no-cache")
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// 反向代理(nginx 等)默认缓冲会吞掉流式响应
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w.Header().Set("X-Accel-Buffering", "no")
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fmt.Fprint(w, ": connected\n\n")
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fl.Flush()
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ch, off := a.Hub.Subscribe(postID)
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defer off()
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heartbeat := time.NewTicker(25 * time.Second)
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defer heartbeat.Stop()
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for {
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select {
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case <-r.Context().Done():
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return
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case <-heartbeat.C:
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fmt.Fprint(w, ": ping\n\n")
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fl.Flush()
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case <-ch:
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fmt.Fprintf(w, "event: comments\ndata: {\"post_id\":%d}\n\n", postID)
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fl.Flush()
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}
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}
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}
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@@ -0,0 +1,49 @@
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// Package hub 是一个极简的进程内发布/订阅:按主题(文章 ID)广播
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// 「有变更」信号。订阅者只拿到一个空 struct 信号——不携带内容,
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// 消费方(SSE 前端)收到后自己 refetch,未审核的评论内容不会经由
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// 这条通道外泄。
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package hub
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import "sync"
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type Hub struct {
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mu sync.Mutex
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subs map[int64]map[chan struct{}]struct{}
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}
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func New() *Hub {
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return &Hub{subs: make(map[int64]map[chan struct{}]struct{})}
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}
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// Subscribe 订阅某主题;返回信号 channel 和退订函数。
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// channel 容量 1:订阅者处理不过来时新信号直接丢弃(合并刷新)。
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func (h *Hub) Subscribe(topic int64) (<-chan struct{}, func()) {
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ch := make(chan struct{}, 1)
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h.mu.Lock()
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if h.subs[topic] == nil {
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h.subs[topic] = make(map[chan struct{}]struct{})
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}
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h.subs[topic][ch] = struct{}{}
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h.mu.Unlock()
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off := func() {
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h.mu.Lock()
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delete(h.subs[topic], ch)
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if len(h.subs[topic]) == 0 {
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delete(h.subs, topic)
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}
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h.mu.Unlock()
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}
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return ch, off
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}
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// Broadcast 唤醒某主题的全部订阅者;积压的订阅者不阻塞。
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func (h *Hub) Broadcast(topic int64) {
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h.mu.Lock()
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defer h.mu.Unlock()
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for ch := range h.subs[topic] {
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select {
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case ch <- struct{}{}:
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default:
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}
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}
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}
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@@ -21,6 +21,7 @@ import (
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"oneblog/internal/auth"
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"oneblog/internal/config"
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"oneblog/internal/db"
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"oneblog/internal/hub"
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"oneblog/internal/storage"
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"oneblog/internal/store"
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"oneblog/internal/thumbs"
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@@ -66,6 +67,8 @@ func main() {
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readerSessions := auth.NewReaderSessions(cfg.SessionSec, 30*24*time.Hour)
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// 后台管理员会话(cookie one_session),前台评论也用它识别站主身份
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adminSessions := admin.NewSessions(cfg.SessionSec, 7*24*time.Hour)
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// 评论变更广播(SSE):公开端订阅、双端发布,共用同一实例
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commentHub := hub.New()
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// 缩略图懒生成 + 磁盘缓存(首次请求生成一次,之后直接供缓存)
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thumbCache := thumbs.NewStore(filepath.Join(cfg.DataDir, ".thumbnail_cache"))
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@@ -79,8 +82,10 @@ func main() {
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GG: auth.Google{ClientID: cfg.GoogleClientID, ClientSecret: cfg.GoogleClientSecret},
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TG: auth.Telegram{Bot: cfg.TelegramBot, Token: cfg.TelegramToken},
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AdminSessions: adminSessions,
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Hub: commentHub,
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}
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adminAPI := admin.NewAPI(st, cfg, adminSessions)
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adminAPI.Hub = commentHub
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adminAPI.Blobs = blobs
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adminAPI.Thumbs = thumbCache // 删文件时连带清掉它的缩略图
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@@ -187,6 +192,14 @@ type statusRecorder struct {
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func (s *statusRecorder) WriteHeader(code int) { s.status = code; s.ResponseWriter.WriteHeader(code) }
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// Flush 透传给底层 writer——SSE 这类流式响应靠它判定可刷新,
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// 包装器不实现 Flusher 的话流式端点会直接不可用。
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func (s *statusRecorder) Flush() {
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if f, ok := s.ResponseWriter.(http.Flusher); ok {
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f.Flush()
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}
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}
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func placeholderPage() string {
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return `<!doctype html><meta charset="utf-8"><title>ONE</title>
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<style>body{font-family:-apple-system,"PingFang SC",sans-serif;background:#faf7f1;color:#33302b;
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