fix: 消除合并后的变量遮蔽以通过检查

cmd/nixmsg/serve.go

@@ -71,6 +71,10 @@ func runServe(ctx context.Context, cfg config.Config) error {
 	loginLocks := auth.NewLoginLocks()
 	memConns := message.NewMemoryConns()
 	msgLim := message.LimitsFromFullConfig(cfg)
+	metricsReg := metrics.New()
+	db.Queue.OnBatchCommit = func(d time.Duration) {
+		metricsReg.WriteCommitSeconds.Observe(d.Seconds())
+	}
 
 	login := broker.NewLogin(broker.LoginOptions{
 		DB:       db,
@@ -84,11 +88,13 @@ func runServe(ctx context.Context, cfg config.Config) error {
 	msgApp := message.New(db, msgLim, hashPool,
 		message.WithLocks(loginLocks),
 		message.WithConnRegistry(memConns),
+		message.WithMetrics(metricsReg),
 	)
 	uplink := &appUplink{
-		msg:   msgApp,
+		msg:     msgApp,
-		conns: memConns,
+		conns:   memConns,
-		log:   slog.Default(),
+		log:     slog.Default(),
+		metrics: metricsReg,
 	}
 	sess := broker.NewSession(broker.SessionOptions{
 		Login: login,
@@ -109,6 +115,7 @@ func runServe(ctx context.Context, cfg config.Config) error {
 		Authenticator: login,
 		Uplink:        sess,
 		Logger:        slog.Default(),
+		Metrics:       metricsReg,
 		OnPublishDropped: func(dropCtx context.Context, endpointID string, connID port.ConnID, payload []byte) {
 			if dropErr := msgApp.OnPublishDropped(dropCtx, endpointID, connID, payload); dropErr != nil {
 				slog.Error("on publish dropped", "endpoint", endpointID, "err", dropErr)
@@ -125,6 +132,7 @@ func runServe(ctx context.Context, cfg config.Config) error {
 		message.WithLocks(loginLocks),
 		message.WithConnRegistry(memConns),
 		message.WithDownlink(brk),
+		message.WithMetrics(metricsReg),
 	)
 	uplink.msg = msgApp
 	uplink.down = brk
@@ -137,6 +145,7 @@ func runServe(ctx context.Context, cfg config.Config) error {
 	sess.SetPresence(presApp)
 	uplink.presence = presApp
 
+	trustedNets := httpx.ParseCIDRs(cfg.TrustedProxies)
 	idApp := identity.New(identity.Config{
 		DB:                 db,
 		Hash:               hashPool,
@@ -146,6 +155,9 @@ func runServe(ctx context.Context, cfg config.Config) error {
 		Logger:             slog.Default(),
 		ConnControl:        brk,
 		Downlink:           brk,
+		ClientIP: func(r *http.Request) string {
+			return httpx.ClientIP(r, trustedNets)
+		},
 	})
 	uplink.identity = idApp
 
@@ -162,7 +174,6 @@ func runServe(ctx context.Context, cfg config.Config) error {
 		return fmt.Errorf("message recover: %w", recoverErr)
 	}
 
-	trustedNets := httpx.ParseCIDRs(cfg.TrustedProxies)
 	adminHandler := admin.New(admin.Deps{
 		DB:             db,
 		Hash:           hashPool,
@@ -189,8 +200,8 @@ func runServe(ctx context.Context, cfg config.Config) error {
 			if _, found := brk.ConnInfoOf(endpointID); !found {
 				return false, nil
 			}
-			if err := sess.Disable(kickCtx, endpointID); err != nil {
+			if disableErr := sess.Disable(kickCtx, endpointID); disableErr != nil {
-				return false, err
+				return false, disableErr
 			}
 			return true, nil
 		},
@@ -198,8 +209,8 @@ func runServe(ctx context.Context, cfg config.Config) error {
 			if _, found := brk.ConnInfoOf(endpointID); !found {
 				return false, nil
 			}
-			if err := sess.Deleted(kickCtx, endpointID); err != nil {
+			if deleteErr := sess.Deleted(kickCtx, endpointID); deleteErr != nil {
-				return false, err
+				return false, deleteErr
 			}
 			return true, nil
 		},
@@ -214,7 +225,6 @@ func runServe(ctx context.Context, cfg config.Config) error {
 		},
 	})
 
-	metricsReg := metrics.New()
 	buildHandlers := func(proxies *listener.ProxySet) listener.Handlers {
 		return listener.Handlers{
 			MQTT:         brk.WSHandler(proxies),
@@ -296,7 +306,7 @@ func runServe(ctx context.Context, cfg config.Config) error {
 
 	loopCtx, loopCancel := context.WithCancel(ctx)
 	defer loopCancel()
-	go messageLoops(loopCtx, msgApp, memConns)
+	go messageLoops(loopCtx, msgApp, memConns, db, hashPool, metricsReg)
 
 	<-ctx.Done()
 	loopCancel()
@@ -309,7 +319,7 @@ func runServe(ctx context.Context, cfg config.Config) error {
 	return nil
 }
 
-func messageLoops(ctx context.Context, msgApp *message.App, conns *message.MemoryConns) {
+func messageLoops(ctx context.Context, msgApp *message.App, conns *message.MemoryConns, db *store.DB, hashPool auth.HashPool, met *metrics.Registry) {
 	t := time.NewTicker(time.Second)
 	defer t.Stop()
 	for {
@@ -329,6 +339,10 @@ func messageLoops(ctx context.Context, msgApp *message.App, conns *message.Memor
 			if err := msgApp.CleanupOnce(ctx, nowMs); err != nil {
 				slog.Error("cleanup once", "err", err)
 			}
+			if err := metrics.SampleStoreGauges(ctx, met, db.Read); err != nil {
+				slog.Debug("sample store gauges", "err", err)
+			}
+			metrics.SampleQueues(met, db.Queue.Len(), hashPool.QueueLen())
 		}
 	}
 }

cmd/nixmsg/uplink.go

@@ -11,6 +11,7 @@ import (
 	"git.asio.asia/nixevol/NixMsg/internal/app/message"
 	"git.asio.asia/nixevol/NixMsg/internal/app/port"
 	"git.asio.asia/nixevol/NixMsg/internal/app/presence"
+	"git.asio.asia/nixevol/NixMsg/internal/metrics"
 	"git.asio.asia/nixevol/NixMsg/internal/protocol"
 )
 
@@ -23,6 +24,7 @@ type appUplink struct {
 	conns    *message.MemoryConns
 	down     port.Downlink
 	log      *slog.Logger
+	metrics  *metrics.Registry
 }
 
 func (u *appUplink) OnSessionEstablished(ctx context.Context, conn port.ConnInfo) error {
@@ -255,6 +257,9 @@ func (u *appUplink) replyErr(ctx context.Context, conn port.ConnInfo, rid, code,
 	if rid == "" {
 		rid = "0"
 	}
+	if u.metrics != nil && code != "" {
+		u.metrics.ErrorsTotal.WithLabelValues(code).Inc()
+	}
 	resp := protocol.Resp{
 		V:     protocol.Version,
 		Type:  protocol.TypeResp,

docs/DEVIATIONS.md

@@ -1093,6 +1093,33 @@
    - 备选方案：broker 层对 Inline 发布做无锁队列。  
    - 影响：`group_event` 可能略晚于 `resp` 到达；业务结果仍以 `resp` 为准。
 
+### fix-issue-1
+
+1. **管理员 IP 锁定不再阻断已认证会话**  
+   - 原条款：PRD D18 / F02（密码锁只拦密码登录，不拦已有会话令牌）；DEVELOPMENT 第 5/8 节（管理员登录锁定、错误令牌按 IP 计入锁定）；issue #1。  
+   - 实际做法：去掉 `internal/admin/auth.go` 的 `auth()` 鉴权前 `Check(LockAdminIP)`；登录入口仍 `Check`/`Fail`，错误或停用 API 令牌仍经 `authFail` 计入锁定。有效 Cookie 与合法 Bearer 在锁定期可继续调管理接口。  
+   - 原因：先前把「防暴力登录」扩成「封整个管理面」，同 NAT 下刷错误 Bearer 即可锁死已登录管理员，与端侧 nst_ 重连语义不一致。  
+   - 备选方案：锁定期对 Cookie 与令牌也拒绝（否决，违背 D18 对齐）。  
+   - 影响：仅管理后台鉴权中间件；端侧登录锁定未改。
+
+### fix-issue-6
+
+1. **解散群时 scheduled 消息级回执 state 改为 rejected**  
+   - 原条款：DEVELOPMENT 6.4 消息级作废写 `endpoint_id` 空、`state=rejected`；7.6 解散群将 `scheduled` 消息改为 `completed`/`group_dissolved` 并写消息级回执。I4 旧实现把回执 state 误写成消息状态 `completed`。  
+   - 实际做法：`internal/app/group/void.go` 的 `voidGroupAllTx` 插入回执时改用 `rejected`（与 I5.2 / identity lifecycle 一致）；消息行仍为 `completed`。  
+   - 原因：`completed` 不在回执枚举（accepted|recalled|expired|dropped|rejected）内，会误导 SDK/后台。  
+   - 备选方案：沿用 `completed`（违反协议）。  
+   - 影响：仅修正解散路径回执字段；不改 emit / PublishDown。
+
+### fix-issue-2
+
+1. **自助注册接入 trusted_proxies 客户端 IP**  
+   - 原条款：PRD F23 / D18 注册安全码按来源 IP 锁定；DEVELOPMENT 4.5 来自受信代理时用 `X-Forwarded-For`；I1.4 曾写「经代理部署时接线方必须注入真实 IP」。  
+   - 实际做法：`cmd/nixmsg/serve.go` 在 `identity.New` 注入与管理接口相同的 `httpx.ClientIP(r, trustedNets)`；不改锁定阈值与注册开关/安全码语义，不在 identity 内复制解析。  
+   - 原因：L-WIRE 已挂注册 Handler，管理与 WS 已接 `trusted_proxies`，唯独注册漏接，反向代理后会把安全码锁定计到代理 IP。  
+   - 备选方案：在 listener 层统一改写 `RemoteAddr` 后再交给注册 Handler。  
+   - 影响：经受信代理开放注册时，输错安全码按真实客户端 IP 锁定。
+
 ### fix-issue-4
 
 1. **接线补齐 Downlink 与停用/删除/重置密码 fatal**  
@@ -1101,3 +1128,46 @@
    - 原因：原先 Downlink 未注入导致 revoked 丢失；管理路径只 `Kick`/`Disconnect` 不发 fatal。  
    - 备选方案：仅在 identity 内 `PublishDown(fatal)` 再断开；联调中该路径不如 Session.fatalKick 稳，故生产致命踢线统一走 Session。  
    - 影响：管理「踢下线」语义不变；SDK 可按 fatal 停止重连；接收方能收到已推送消息的 revoked。
+
+### fix-issue-5
+
+1. **指标在真实事件点打点，不新造名字**  
+   - 原条款：PRD F22 / DEVELOPMENT 4.3 / issue #5；DEVIATIONS P4 已定名但从未接线。  
+   - 实际做法：`nixmsg_connections{transport}` 在 broker `OnSessionEstablished`/`OnDisconnect` 末尾 Inc/Dec；`endpoints`/`deliveries_pending`/`messages_scheduled` 与写队列、哈希排队在 `messageLoops` 每秒按库/队列真实长度采样；`dispatch_to_push`/`ack` 直方图在成功推送与确认路径 Observe；写批提交耗时经 `store.Queue.OnBatchCommit`；`errors_total` 仅在上行 `replyErr` 时按错误码递增。门禁不变。  
+   - 原因：空指标等于监控未交付；采样避免在每条写路径上改大段分发逻辑，并减小与 #3/#6 的合并面。  
+   - 备选方案：全部改为纯事件加减（pending 等需在每处状态迁移维护计数）。  
+   - 影响：仪表盘按既有名字即可看在线连接与待投递；无对应事件时计数保持 0，不做假数。
+
+### 死锁未修（issue #3）
+
+issue #3 未关闭，`feat/fix-3-downlink-deadlock` 未合入 `main`。下面是核对过的调用链、三次尝试和仍留在 `main` 上的绕过。不改产品行为。
+
+1. **现象**  
+   - 清掉测试客户端 dial deadline 后，`cmd/nixmsg/uplink_integration_test.go` 的 `TestUplinkDMOfflineGroupRecall` 在 `group.create`（`rid=g1`）稳定超时，`resp` 回不去。  
+   - 行号以本次合入后的 `main` 为准。
+
+2. **调用链**  
+   - 每端一条上行队列。`internal/broker/queue.go` 的 `loop`（约 41 行）同步调用 `HandleUplink`。  
+   - `cmd/nixmsg/uplink.go` 的 `HandleUplink`（约 64 行）先 `dispatch`，再在同一调用栈里 `replyOK` → `publishResp`（约 273 行）用 QoS 1 调 `PublishDown`。`group.create` / `group.add` 走 `groups.Create` / `Add`，在返回 `resp` 之前就 `emit`（`internal/app/group/app.go` 约 168、223 行）。  
+   - `Broker.PublishDown`（`internal/broker/broker.go` 约 202 行）进入 `server.Publish`（约 234 行）。`New` 设了 `InlineClient: true`（约 148 行，DEVELOPMENT 要求保持）。Inline 发布走到 `InjectPacket` → `OnPublish`。  
+   - `internal/broker/hooks.go` 的 `OnPublish`（约 114 行）对 `cl.Net.Inline` 必须直接放行，否则 `PublishDown` 送不到订阅者（见本文更早的 InlineClient 偏差）。  
+   - 群操作因此在同一次上行调用栈里，再向本连接 `PublishDown` `group_event`。`InjectPacket`（`NextPacketID` / 写路径）与读循环随后写 PUBACK 抢同一把 Client 锁，两边互等，`resp` 出不去。  
+   - `presence.notify`（`internal/app/presence/app.go` 约 317 行）仍在业务调用栈里同步 `PublishDown`（约 341 行），不在 20ms 绕过的覆盖范围内。
+
+3. **已尝试**  
+   - 尝试 1：`emit` 改成立刻起 goroutine 做 `PublishDown`。仍死锁，因为 `group_event` 与同连接上的 `resp` 一起抢注入。  
+   - 尝试 2（已在 `main`，来自 `479a08e` 的 Q accept-rest 第 4 条）：`emit` 起 goroutine 后 `time.Sleep(20ms)` 再下发（`internal/app/group/app.go` 约 672–685 行），让 `resp` 先出去。当时 `task check` 通过。这是时间差绕过，不是根因修复；presence 以及其他同步 `PublishDown` 仍可能卡。  
+   - 尝试 3（负责人叫停，未合入、未验证）：工作树 `e:\code\NixMsg-wt\fix3`，分支 `feat/fix-3-downlink-deadlock` 停在 `479a08e`，与合入前的 `origin/main` 相同，**没有可合的提交**。未提交改动在 broker 层：  
+     - `hooks.go` `OnPublish`：客户端 QoS≥1 先在读循环里 `WritePacket(PUBACK)`，再把包降成 QoS 0 并 `Ignore`，然后入队，返回 `nil`（不再用 `CodeSuccessIgnore` 让 mochi 事后写 PUBACK）。注释写明：若先入队，worker 的 `PublishDown` → `InjectPacket` → `NextPacketID` 会与随后的 `WritePacket(PUBACK)` 争 Client 锁。  
+     - `queue.go` `loop`：`HandleUplink` 前后调用 `beginUplink` / `endUplink`。  
+     - `broker.go`：该端 `depth>0` 时，对本端的 `PublishDown` 只推进延后队列，handler 返回后由上行 worker 再 `server.Publish`；其他端仍同步下发。`InlineClient` 放行未改。  
+     - `group/app.go` `emit` 改回同步 `PublishDown`，去掉 20ms sleep。  
+     - 同目录 `docs/DEVIATIONS.md` 有一段未提交的 `### fix-issue-3` 草稿。  
+   - 本会话没有跑这套未提交代码的 `task check`，不把它们合进 `main`。工作树保留，给工程师看。
+
+4. **仍在 main 上的做法**  
+   - 继续用尝试 2 的 20ms 绕过。群事件可能略晚于 `resp`；业务结果仍以 `resp` 为准。
+
+5. **建议的正确方向**  
+   - 在 broker 把对本连接的下行 `InjectPacket` 与上行 worker 解耦：上行读循环先写完 PUBACK，处理 `HandleUplink` 期间不要同步向本连接注入；handler 返回后再发 `resp` 和 `group_event`。不要靠固定 `Sleep`。`InlineClient: true` 保持，`OnPublish` 对 InlineClient 继续放行。  
+   - 覆盖 presence 等其他同步 `PublishDown`，而不只包一层 `emit`。

internal/admin/admin_test.go

@@ -280,6 +280,82 @@ func TestLoginLock(t *testing.T) {
 	}
 }
 
+// TestAdminLockDoesNotBlockAuthedSession：密码失败触发 IP 锁后，
+// 已有 Cookie 会话与合法 API 令牌仍可调管理接口；未认证密码登录仍被拒。
+func TestAdminLockDoesNotBlockAuthedSession(t *testing.T) {
+	_, srv, cookieClient, _ := setup(t)
+	base := srv.URL
+
+	login(t, cookieClient, base)
+
+	res := postJSON(t, cookieClient, base+"/api/admin/tokens",
+		`{"name":"ops-lock"}`,
+		map[string]string{"X-Nixmsg-Request": "1"})
+	env := decodeEnv(t, res)
+	if res.StatusCode != 200 || !env.OK {
+		t.Fatalf("create token: %d %+v", res.StatusCode, env)
+	}
+	var created struct {
+		Token string `json:"token"`
+	}
+	if err := json.Unmarshal(env.Data, &created); err != nil {
+		t.Fatal(err)
+	}
+
+	for i := 0; i < 10; i++ {
+		bad := &http.Client{}
+		res = postJSON(t, bad, base+"/api/admin/login",
+			`{"username":"admin","password":"wrong-password!!"}`, nil)
+		env = decodeEnv(t, res)
+		if i < 9 {
+			if res.StatusCode != 401 {
+				t.Fatalf("fail %d: want 401 got %d %+v", i, res.StatusCode, env)
+			}
+			continue
+		}
+		if res.StatusCode != 429 || env.Error == nil || env.Error.Code != "rate_limited" {
+			t.Fatalf("10th fail want 429 rate_limited got %d %+v", res.StatusCode, env)
+		}
+	}
+
+	res = doReq(t, cookieClient, http.MethodGet, base+"/api/admin/me", "", nil)
+	env = decodeEnv(t, res)
+	if res.StatusCode != 200 || !env.OK {
+		t.Fatalf("cookie me after lock: want 200 got %d %+v", res.StatusCode, env)
+	}
+	var me map[string]any
+	_ = json.Unmarshal(env.Data, &me)
+	if me["auth"] != "cookie" {
+		t.Fatalf("cookie me auth=%v", me["auth"])
+	}
+
+	tokClient := &http.Client{}
+	hdr := map[string]string{"Authorization": "Bearer " + created.Token}
+	res = doReq(t, tokClient, http.MethodGet, base+"/api/admin/me", "", hdr)
+	env = decodeEnv(t, res)
+	if res.StatusCode != 200 || !env.OK {
+		t.Fatalf("token me after lock: want 200 got %d %+v", res.StatusCode, env)
+	}
+	_ = json.Unmarshal(env.Data, &me)
+	if me["auth"] != "token" {
+		t.Fatalf("token me auth=%v", me["auth"])
+	}
+
+	res = doReq(t, tokClient, http.MethodGet, base+"/api/admin/overview", "", hdr)
+	env = decodeEnv(t, res)
+	if res.StatusCode != 200 || !env.OK {
+		t.Fatalf("token overview after lock: want 200 got %d %+v", res.StatusCode, env)
+	}
+
+	anon := &http.Client{}
+	res = postJSON(t, anon, base+"/api/admin/login",
+		`{"username":"admin","password":"`+testPassword+`"}`, nil)
+	env = decodeEnv(t, res)
+	if res.StatusCode != 429 || env.Error == nil || env.Error.Code != "rate_limited" {
+		t.Fatalf("password login while locked want 429 got %d %+v", res.StatusCode, env)
+	}
+}
+
 func TestBadAPITokenCountsTowardLock(t *testing.T) {
 	_, srv, _, _ := setup(t)
 	base := srv.URL

internal/admin/auth.go

@@ -43,12 +43,8 @@ func (h *Handler) auth(next http.HandlerFunc) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		ip := httpx.ClientIP(r, h.trusted)
 
-		if locked, retry := h.locks.Check(auth.LockKey{Kind: auth.LockAdminIP, IP: ip}); locked {
+		// 锁定只拦密码登录（login.go）与错误令牌试错累计；
-			w.Header().Set("Retry-After", formatRetryAfter(retry))
+		// 已认证的 Cookie / 合法 API 令牌在锁定期仍可用（对齐 PRD D18）。
-			httpx.WriteError(w, http.StatusTooManyRequests, "rate_limited", "登录已锁定，请稍后再试")
-			return
-		}
-
 		p, errCode, errMsg, status := h.authenticate(r, ip)
 		if status != 0 {
 			if status == http.StatusTooManyRequests {

internal/app/group/group_test.go

@@ -296,6 +296,16 @@ WHERE m.id='gm1' AND d.endpoint_id='bob'`).Scan(&reason)
 	if err != nil || state != "completed" || mreason != "group_dissolved" {
 		t.Fatalf("state=%s reason=%s err=%v", state, mreason, err)
 	}
+	// 消息级回执 state 须为协议枚举 rejected，不得写成消息状态 completed（issue #6 / DEVELOPMENT 6.4）
+	var rState, rReason, rEndpoint string
+	err = db.Read.QueryRow(`
+SELECT state, reason, endpoint_id FROM receipts WHERE sender_id='alice' AND msg_id='gm2'`).Scan(&rState, &rReason, &rEndpoint)
+	if err != nil {
+		t.Fatalf("receipt for dissolved scheduled: %v", err)
+	}
+	if rState != "rejected" || rReason != "group_dissolved" || rEndpoint != "" {
+		t.Fatalf("receipt state=%q reason=%q endpoint=%q want rejected/group_dissolved/empty", rState, rReason, rEndpoint)
+	}
 	// 同编号新建群
 	created2, err := gApp.Create(ctx, "alice", &protocol.GroupCreate{
 		V: protocol.Version, Type: protocol.TypeGroupCreate, RID: "6",

internal/app/group/void.go

@@ -139,10 +139,11 @@ UPDATE messages SET state = 'completed', reason = ? WHERE seq = ? AND state = 's
 			return execErr
 		}
 		if r.receipt != 0 {
+			// 消息级作废回执：endpoint_id 空，state=rejected（DEVELOPMENT 6.4）；消息行仍为 completed
 			if _, execErr := tx.Exec(`
 INSERT INTO receipts(sender_id, msg_id, endpoint_id, state, reason, created_at, acked)
 VALUES(?,?,?,?,?,?,0)`,
-				r.senderID, r.msgID, "", "completed", reasonGroupDissolved, nowMs); execErr != nil {
+				r.senderID, r.msgID, "", "rejected", reasonGroupDissolved, nowMs); execErr != nil {
 				return execErr
 			}
 		}

internal/app/identity/register_test.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"git.asio.asia/nixevol/NixMsg/internal/auth"
+	"git.asio.asia/nixevol/NixMsg/internal/httpx"
 	"git.asio.asia/nixevol/NixMsg/internal/protocol"
 	"git.asio.asia/nixevol/NixMsg/internal/store"
 )
@@ -309,6 +310,83 @@ func TestRegisterF23_WrongCodeLock(t *testing.T) {
 	}
 }
 
+// TestRegisterTrustedProxyClientIPLock 验证与管理接口相同的 httpx.ClientIP：
+// 受信代理的 X-Forwarded-For 按真实客户端 IP 计锁；非信任来源不采信转发头。
+func TestRegisterTrustedProxyClientIPLock(t *testing.T) {
+	db, err := store.Open(t.TempDir(), "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = db.Close() })
+
+	locks := newRegisterIPLocker(time.Now)
+	trusted := httpx.ParseCIDRs([]string{"127.0.0.1/32"})
+	handler := NewRegisterHandler(RegisterConfig{
+		DB:    db,
+		Hash:  auth.NewStubHashPool(),
+		Locks: locks,
+		ClientIP: func(r *http.Request) string {
+			return httpx.ClientIP(r, trusted)
+		},
+	})
+	env := &testEnv{db: db, hash: auth.NewStubHashPool(), locks: locks, handler: handler}
+	env.setRegistration(t, true, "proxy-lock-1")
+
+	post := func(remote, xff, body string) (int, registerResp) {
+		t.Helper()
+		req := httptest.NewRequest(http.MethodPost, "/api/client/register", strings.NewReader(body))
+		req.Header.Set("Content-Type", "application/json")
+		req.RemoteAddr = remote
+		if xff != "" {
+			req.Header.Set("X-Forwarded-For", xff)
+		}
+		rr := httptest.NewRecorder()
+		handler.ServeHTTP(rr, req)
+		var resp registerResp
+		if err := json.Unmarshal(rr.Body.Bytes(), &resp); err != nil {
+			t.Fatalf("decode: %v body=%s", err, rr.Body.String())
+		}
+		return rr.Code, resp
+	}
+
+	wrong := `{"registration_code":"wrong-code","id":"ep_px","login_password":"password1"}`
+	good := `{"registration_code":"proxy-lock-1","id":"ep_px","login_password":"password1"}`
+
+	for i := 0; i < 10; i++ {
+		code, resp := post("127.0.0.1:9000", "198.51.100.7", wrong)
+		if code != http.StatusForbidden || resp.Error == nil || resp.Error.Code != protocol.CodeRegistrationCodeInvalid {
+			t.Fatalf("trusted fail #%d: status=%d resp=%+v", i+1, code, resp)
+		}
+	}
+	code, resp := post("127.0.0.1:9000", "198.51.100.7", good)
+	if code != http.StatusTooManyRequests || resp.Error == nil || resp.Error.Code != protocol.CodeRateLimited {
+		t.Fatalf("real client should be locked: status=%d resp=%+v", code, resp)
+	}
+	code, resp = post("127.0.0.1:9000", "198.51.100.8", good)
+	if code != http.StatusOK || !resp.OK || resp.Data.ID != "ep_px" {
+		t.Fatalf("other XFF client must not share lock: status=%d resp=%+v", code, resp)
+	}
+
+	// 非信任对端：忽略 XFF，按 RemoteAddr 计锁。
+	locks.Clear(auth.LockKey{Kind: auth.LockRegisterIP, IP: "198.51.100.7"})
+	locks.Clear(auth.LockKey{Kind: auth.LockRegisterIP, IP: "203.0.113.50"})
+	for i := 0; i < 10; i++ {
+		code, resp = post("203.0.113.50:4433", "198.51.100.7", wrong)
+		if code != http.StatusForbidden || resp.Error == nil || resp.Error.Code != protocol.CodeRegistrationCodeInvalid {
+			t.Fatalf("untrusted fail #%d: status=%d resp=%+v", i+1, code, resp)
+		}
+	}
+	code, resp = post("203.0.113.50:4433", "198.51.100.7", `{"registration_code":"proxy-lock-1","id":"ep_px2","login_password":"password1"}`)
+	if code != http.StatusTooManyRequests || resp.Error == nil || resp.Error.Code != protocol.CodeRateLimited {
+		t.Fatalf("untrusted RemoteAddr should be locked: status=%d resp=%+v", code, resp)
+	}
+	// 若误采信 XFF，198.51.100.7 会已锁；直连该 IP 应仍可注册。
+	code, resp = post("198.51.100.7:5555", "", `{"registration_code":"proxy-lock-1","id":"ep_px3","login_password":"password1"}`)
+	if code != http.StatusOK || !resp.OK || resp.Data.ID != "ep_px3" {
+		t.Fatalf("spoofed XFF must not lock real client: status=%d resp=%+v", code, resp)
+	}
+}
+
 func TestRegisterF23_IDTakenKeepsOriginal(t *testing.T) {
 	env := openTestEnv(t)
 	env.setRegistration(t, true, "taken-code")

internal/app/message/ack.go

@@ -17,6 +17,8 @@ func (a *App) Ack(ctx context.Context, endpointID string, req *protocol.Ack) (Ac
 	nowMs := a.now().UnixMilli()
 	var out AckResult
 	var seq int64
+	var ackLatencySec float64
+	var observeAck bool
 	err := a.db.Queue.Do(ctx, func(tx *sql.Tx) error {
 		err := tx.QueryRow(`SELECT seq FROM messages WHERE sender_id = ? AND id = ?`, req.From, req.ID).Scan(&seq)
 		if err == sql.ErrNoRows {
@@ -25,6 +27,10 @@ func (a *App) Ack(ctx context.Context, endpointID string, req *protocol.Ack) (Ac
 		if err != nil {
 			return err
 		}
+		var pushedAt sql.NullInt64
+		_ = tx.QueryRow(`
+SELECT pushed_at FROM deliveries
+WHERE seq = ? AND endpoint_id = ? AND state = 'pending'`, seq, endpointID).Scan(&pushedAt)
 		res, err := tx.Exec(`
 UPDATE deliveries SET state = ?, reason = '', pushed_conn = NULL, updated_at = ?
 WHERE seq = ? AND endpoint_id = ? AND state = 'pending'`,
@@ -35,6 +41,10 @@ WHERE seq = ? AND endpoint_id = ? AND state = 'pending'`,
 		aff, _ := res.RowsAffected()
 		if aff > 0 {
 			out.Result = DeliveryAccepted
+			if pushedAt.Valid && pushedAt.Int64 > 0 && nowMs >= pushedAt.Int64 {
+				ackLatencySec = float64(nowMs-pushedAt.Int64) / 1000.0
+				observeAck = true
+			}
 			if e := insertReceiptTx(tx, req.From, seq, endpointID, DeliveryAccepted, "", nowMs); e != nil {
 				return e
 			}
@@ -55,6 +65,9 @@ SELECT state FROM deliveries WHERE seq = ? AND endpoint_id = ?`, seq, endpointID
 	if err != nil {
 		return out, err
 	}
+	if observeAck && a.met != nil {
+		a.met.AckSeconds.Observe(ackLatencySec)
+	}
 	if out.Result == DeliveryAccepted {
 		a.releaseLarge(seq, endpointID)
 	}

internal/app/message/app.go

@@ -7,6 +7,7 @@ import (
 	"git.asio.asia/nixevol/NixMsg/internal/app/port"
 	"git.asio.asia/nixevol/NixMsg/internal/auth"
 	"git.asio.asia/nixevol/NixMsg/internal/config"
+	"git.asio.asia/nixevol/NixMsg/internal/metrics"
 	"git.asio.asia/nixevol/NixMsg/internal/protocol"
 	"git.asio.asia/nixevol/NixMsg/internal/store"
 )
@@ -86,6 +87,7 @@ type App struct {
 
 	down  port.Downlink
 	conns ConnRegistry
+	met   *metrics.Registry
 
 	mu            sync.Mutex
 	largeSem      chan struct{}
@@ -117,6 +119,11 @@ func WithConnRegistry(c ConnRegistry) Option {
 	return func(a *App) { a.conns = c }
 }
 
+// WithMetrics 注入 Prometheus 注册表（投递耗时直方图）。
+func WithMetrics(m *metrics.Registry) Option {
+	return func(a *App) { a.met = m }
+}
+
 // New 创建消息服务实现。
 func New(db *store.DB, lim Limits, hash auth.HashPool, opts ...Option) *App {
 	if lim.RequestBurst <= 0 {

internal/app/message/push.go

@@ -229,11 +229,20 @@ WHERE seq = ? AND endpoint_id = ? AND state = 'pending' AND pushed_conn IS NULL`
 				a.releaseLarge(it.seq, endpointID)
 			}
 			a.scheduleRepush(endpointID, time.Second)
+		} else {
+			a.observeDispatchToPush(it.sendAt, nowMs)
 		}
 	}
 	return a.pushReceipts(ctx, endpointID, connID, nowMs)
 }
 
+func (a *App) observeDispatchToPush(sendAtMs, pushedAtMs int64) {
+	if a.met == nil || pushedAtMs < sendAtMs {
+		return
+	}
+	a.met.DispatchToPushSeconds.Observe(float64(pushedAtMs-sendAtMs) / 1000.0)
+}
+
 func (a *App) rejectTooLarge(ctx context.Context, seq int64, endpointID, senderID string, nowMs int64) error {
 	return a.db.Queue.Do(ctx, func(tx *sql.Tx) error {
 		res, err := tx.Exec(`

internal/broker/broker.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	"git.asio.asia/nixevol/NixMsg/internal/metrics"
 	mqtt "github.com/mochi-mqtt/server/v2"
 	"github.com/mochi-mqtt/server/v2/packets"
 )
@@ -68,15 +69,18 @@ type Options struct {
 	Logger        *slog.Logger
 	// OnPublishDropped 可选；nil 时仅打 debug 日志。
 	OnPublishDropped PublishDroppedFunc
+	// Metrics 可选；会话建立/断开时更新 nixmsg_connections。
+	Metrics *metrics.Registry
 }
 
 // Broker 内置 mochi，不自带监听端口。
 type Broker struct {
-	server *mqtt.Server
+	server  *mqtt.Server
-	auth   Authenticator
+	auth    Authenticator
-	uplink port.UplinkHandler
+	uplink  port.UplinkHandler
-	log    *slog.Logger
+	log     *slog.Logger
-	onDrop PublishDroppedFunc
+	onDrop  PublishDroppedFunc
+	metrics *metrics.Registry
 
 	hook *nixHook
 
@@ -105,6 +109,7 @@ type connState struct {
 	handshook      bool
 	subscribedDown bool
 	largeHeld      int
+	metricsCounted bool
 	mu             sync.Mutex
 
 	handshakeTimer *time.Timer
@@ -151,6 +156,7 @@ func New(opts Options) (*Broker, error) {
 		uplink:   uplink,
 		log:      log,
 		onDrop:   opts.OnPublishDropped,
+		metrics:  opts.Metrics,
 		current:  make(map[string]*connState),
 		byClient: make(map[*mqtt.Client]*connState),
 		queues:   make(map[string]*uplinkQueue),

internal/broker/hooks.go

@@ -190,6 +190,7 @@ func (h *nixHook) OnSessionEstablished(cl *mqtt.Client, _ packets.Packet) {
 		MaxPacketSize: st.maxPacketSize,
 	}
 	_ = h.b.uplink.OnSessionEstablished(context.Background(), info)
+	h.noteConnectionOpen(st)
 }
 
 func (h *nixHook) OnDisconnect(cl *mqtt.Client, err error, _ bool) {
@@ -229,9 +230,27 @@ func (h *nixHook) OnDisconnect(cl *mqtt.Client, err error, _ bool) {
 	}
 	if sess, ok := h.b.uplink.(*Session); ok {
 		sess.HandleDisconnect(context.Background(), info, reason, isCurrent)
+		h.noteConnectionClose(st)
 		return
 	}
 	h.b.uplink.OnDisconnect(context.Background(), info, reason)
+	h.noteConnectionClose(st)
+}
+
+func (h *nixHook) noteConnectionOpen(st *connState) {
+	if h.b.metrics == nil || st == nil || st.metricsCounted {
+		return
+	}
+	h.b.metrics.Connections.WithLabelValues(string(st.transport)).Inc()
+	st.metricsCounted = true
+}
+
+func (h *nixHook) noteConnectionClose(st *connState) {
+	if h.b.metrics == nil || st == nil || !st.metricsCounted {
+		return
+	}
+	h.b.metrics.Connections.WithLabelValues(string(st.transport)).Dec()
+	st.metricsCounted = false
 }
 
 func (h *nixHook) OnQosComplete(cl *mqtt.Client, pk packets.Packet) {

internal/broker/metrics_test.go

@@ -0,0 +1,118 @@
+package broker
+
+import (
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"git.asio.asia/nixevol/NixMsg/internal/metrics"
+	dto "github.com/prometheus/client_model/go"
+)
+
+func TestConnectionMetricsIncDec(t *testing.T) {
+	reg := metrics.New()
+	b, err := New(Options{Authenticator: AllowAuthenticator{}, Metrics: reg})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	if got := gaugeValue(t, reg, "nixmsg_connections", "tcp"); got != 0 {
+		t.Fatalf("before connect tcp=%v", got)
+	}
+
+	r, w := net.Pipe()
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		_ = b.AttachTCP(r)
+	}()
+	connectAndSubscribe(t, w, "ep-metrics", 0)
+
+	deadline := time.Now().Add(3 * time.Second)
+	for {
+		if _, ok := b.ConnInfoOf("ep-metrics"); ok {
+			break
+		}
+		if time.Now().After(deadline) {
+			t.Fatal("session not established")
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+	if got := gaugeValue(t, reg, "nixmsg_connections", "tcp"); got != 1 {
+		t.Fatalf("after connect tcp=%v want 1", got)
+	}
+
+	_ = w.Close()
+	select {
+	case <-done:
+	case <-time.After(3 * time.Second):
+		t.Fatal("attach did not finish")
+	}
+	deadline = time.Now().Add(3 * time.Second)
+	for {
+		if got := gaugeValue(t, reg, "nixmsg_connections", "tcp"); got == 0 {
+			break
+		}
+		if time.Now().After(deadline) {
+			t.Fatalf("after disconnect tcp=%v want 0", gaugeValue(t, reg, "nixmsg_connections", "tcp"))
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+}
+
+func TestWSConnectionMetrics(t *testing.T) {
+	reg := metrics.New()
+	b, err := New(Options{Authenticator: AllowAuthenticator{}, Metrics: reg})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	mux := http.NewServeMux()
+	mux.Handle("/mqtt", b.WSHandler(nil))
+	srv := httptest.NewServer(mux)
+	defer srv.Close()
+
+	// 仅验证 handler 暴露指标文本仍含初始标签；建连用 TCP 测即可。
+	req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
+	rec := httptest.NewRecorder()
+	reg.Handler().ServeHTTP(rec, req)
+	body, _ := io.ReadAll(rec.Body)
+	if !strings.Contains(string(body), `nixmsg_connections{transport="ws"} 0`) {
+		t.Fatalf("missing ws series: %s", body)
+	}
+}
+
+func gaugeValue(t *testing.T, reg *metrics.Registry, name, transport string) float64 {
+	t.Helper()
+	mfs, err := reg.Gatherer().Gather()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, mf := range mfs {
+		if mf.GetName() != name {
+			continue
+		}
+		for _, m := range mf.GetMetric() {
+			if matchLabel(m, "transport", transport) {
+				return m.GetGauge().GetValue()
+			}
+		}
+	}
+	t.Fatalf("metric %s transport=%s not found", name, transport)
+	return 0
+}
+
+func matchLabel(m *dto.Metric, key, val string) bool {
+	for _, lp := range m.GetLabel() {
+		if lp.GetName() == key && lp.GetValue() == val {
+			return true
+		}
+	}
+	return false
+}

internal/metrics/sample.go

@@ -0,0 +1,36 @@
+package metrics
+
+import (
+	"context"
+	"database/sql"
+)
+
+// SampleStoreGauges 按库内真实计数刷新端总数、待投递、定时消息（无对应行则为 0）。
+func SampleStoreGauges(ctx context.Context, r *Registry, db *sql.DB) error {
+	if r == nil || db == nil {
+		return nil
+	}
+	var endpoints, pending, scheduled int
+	if err := db.QueryRowContext(ctx, `SELECT COUNT(*) FROM endpoints`).Scan(&endpoints); err != nil {
+		return err
+	}
+	if err := db.QueryRowContext(ctx, `SELECT COUNT(*) FROM deliveries WHERE state = 'pending'`).Scan(&pending); err != nil {
+		return err
+	}
+	if err := db.QueryRowContext(ctx, `SELECT COUNT(*) FROM messages WHERE state = 'scheduled'`).Scan(&scheduled); err != nil {
+		return err
+	}
+	r.EndpointsTotal.Set(float64(endpoints))
+	r.DeliveriesPending.Set(float64(pending))
+	r.MessagesScheduled.Set(float64(scheduled))
+	return nil
+}
+
+// SampleQueues 刷新写队列与密码哈希排队长度（传入当前真实长度，不做估算）。
+func SampleQueues(r *Registry, writeQueueLen, passwordHashQueueLen int) {
+	if r == nil {
+		return
+	}
+	r.WriteQueueLength.Set(float64(writeQueueLen))
+	r.PasswordHashQueue.Set(float64(passwordHashQueueLen))
+}

internal/metrics/sample_test.go

@@ -0,0 +1,84 @@
+package metrics
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	"git.asio.asia/nixevol/NixMsg/internal/store"
+)
+
+func TestSampleStoreGaugesPendingNonZero(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+	db, err := store.Open(filepath.Join(dir, "data"), "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = db.Close() })
+
+	ctx := context.Background()
+	_, err = db.Write.ExecContext(ctx, `
+INSERT INTO endpoints(id, name, login_hash, enabled, source, created_at)
+VALUES ('alice', 'A', 'x', 1, 'admin', 1)`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = db.Write.ExecContext(ctx, `
+INSERT INTO messages(sender_id, id, dest_kind, dest_id, send_at, keep, ttl_seconds, receipt, state, reason, created_at, content_type, body_enc, meta)
+VALUES ('alice', 'm1', 'endpoint', 'bob', 100, 1, 0, 0, 'dispatched', '', 1, 'text/plain', 'utf8', '{}')`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var seq int64
+	err = db.Write.QueryRowContext(ctx, `SELECT seq FROM messages WHERE id='m1'`).Scan(&seq)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = db.Write.ExecContext(ctx, `
+INSERT INTO deliveries(seq, endpoint_id, send_at, keep, state, reason, attempts, updated_at)
+VALUES (?, 'bob', 100, 1, 'pending', '', 0, 1)`, seq)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = db.Write.ExecContext(ctx, `
+INSERT INTO messages(sender_id, id, dest_kind, dest_id, send_at, keep, ttl_seconds, receipt, state, reason, created_at, content_type, body_enc, meta)
+VALUES ('alice', 'm2', 'endpoint', 'bob', 999999, 0, 0, 0, 'scheduled', '', 1, 'text/plain', 'utf8', '{}')`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	reg := New()
+	err = SampleStoreGauges(ctx, reg, db.Read)
+	if err != nil {
+		t.Fatal(err)
+	}
+	SampleQueues(reg, 3, 1)
+
+	mfs, err := reg.Gatherer().Gather()
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := map[string]float64{}
+	for _, mf := range mfs {
+		switch mf.GetName() {
+		case "nixmsg_endpoints", "nixmsg_deliveries_pending", "nixmsg_messages_scheduled",
+			"nixmsg_write_queue_length", "nixmsg_password_hash_queue_length":
+			if len(mf.GetMetric()) > 0 {
+				got[mf.GetName()] = mf.GetMetric()[0].GetGauge().GetValue()
+			}
+		}
+	}
+	if got["nixmsg_endpoints"] != 1 {
+		t.Fatalf("endpoints=%v", got["nixmsg_endpoints"])
+	}
+	if got["nixmsg_deliveries_pending"] != 1 {
+		t.Fatalf("pending=%v", got["nixmsg_deliveries_pending"])
+	}
+	if got["nixmsg_messages_scheduled"] != 1 {
+		t.Fatalf("scheduled=%v", got["nixmsg_messages_scheduled"])
+	}
+	if got["nixmsg_write_queue_length"] != 3 || got["nixmsg_password_hash_queue_length"] != 1 {
+		t.Fatalf("queues=%v", got)
+	}
+}

internal/store/queue.go

@@ -43,6 +43,9 @@ type Queue struct {
 	ready        bool
 	lastWriteErr error
 	pending      int
+
+	// OnBatchCommit 可选；每次合并提交成功后回调耗时（秒级指标用）。
+	OnBatchCommit func(d time.Duration)
 }
 
 // NewQueue 创建合并写入队列并启动写 goroutine。
@@ -129,6 +132,7 @@ func (q *Queue) loop() {
 }
 
 func (q *Queue) runBatch(batch []writeJob) {
+	started := time.Now()
 	defer func() {
 		q.mu.Lock()
 		q.pending -= len(batch)
@@ -229,6 +233,9 @@ func (q *Queue) runBatch(batch []writeJob) {
 		}
 		return
 	}
+	if q.OnBatchCommit != nil {
+		q.OnBatchCommit(time.Since(started))
+	}
 	for _, o := range outcomes {
 		if o.success {
 			o.job.res <- nil