feat: 实现消息提交防重配额授权与最小分发

cmd/nixmsg/admin.go

@@ -0,0 +1,170 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"git.asio.asia/nixevol/NixMsg/internal/auth"
+	"git.asio.asia/nixevol/NixMsg/internal/config"
+	"git.asio.asia/nixevol/NixMsg/internal/store"
+)
+
+const (
+	adminPasswordLen    = 20
+	minAdminPasswordLen = 12
+	adminPasswordChars  = "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz23456789"
+)
+
+func cmdAdmin(args []string) error {
+	if len(args) < 1 {
+		return errors.New("usage: nixmsg admin <init|set-password>")
+	}
+	switch args[0] {
+	case "init":
+		return cmdAdminInit(args[1:])
+	case "set-password":
+		return cmdAdminSetPassword(args[1:])
+	default:
+		return fmt.Errorf("unknown admin command: %s", args[0])
+	}
+}
+
+func cmdAdminInit(_ []string) error {
+	cfg, err := loadAndValidateConfig()
+	if err != nil {
+		return err
+	}
+	ctx := context.Background()
+	db, err := store.Open(cfg.DataDir, cfg.SQLiteSynchronous)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = db.Close() }()
+
+	ok, err := store.HasAdminPassword(ctx, db.Write)
+	if err != nil {
+		return err
+	}
+	if ok {
+		return errors.New("admin already initialized; use admin set-password")
+	}
+
+	password, err := generateAdminPassword(adminPasswordLen)
+	if err != nil {
+		return err
+	}
+	phc, err := auth.HashPassword(password)
+	if err != nil {
+		return err
+	}
+	if err := store.SetAdminPasswordHash(ctx, db.Write, phc); err != nil {
+		return err
+	}
+	// 密码只打印到终端一次，不进日志。
+	fmt.Printf("admin password: %s\n", password)
+	return nil
+}
+
+func cmdAdminSetPassword(args []string) error {
+	password, err := parseSetPasswordArgs(args, os.Stdin)
+	if err != nil {
+		return err
+	}
+	if vErr := validateAdminPassword(password); vErr != nil {
+		return vErr
+	}
+	cfg, err := loadAndValidateConfig()
+	if err != nil {
+		return err
+	}
+	ctx := context.Background()
+	db, err := store.Open(cfg.DataDir, cfg.SQLiteSynchronous)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = db.Close() }()
+
+	phc, err := auth.HashPassword(password)
+	if err != nil {
+		return err
+	}
+	if err := store.SetAdminPasswordHash(ctx, db.Write, phc); err != nil {
+		return err
+	}
+	fmt.Fprintln(os.Stderr, "admin password updated")
+	return nil
+}
+
+func parseSetPasswordArgs(args []string, stdin io.Reader) (string, error) {
+	var password string
+	for i := 0; i < len(args); i++ {
+		switch args[i] {
+		case "--password":
+			if i+1 >= len(args) {
+				return "", errors.New("usage: nixmsg admin set-password --password <password>")
+			}
+			password = args[i+1]
+			i++
+		default:
+			if strings.HasPrefix(args[i], "-") {
+				return "", fmt.Errorf("unknown flag: %s", args[i])
+			}
+			if password != "" {
+				return "", errors.New("usage: nixmsg admin set-password --password <password>")
+			}
+			password = args[i]
+		}
+	}
+	if password == "" {
+		b, err := io.ReadAll(io.LimitReader(stdin, 4096))
+		if err != nil {
+			return "", err
+		}
+		password = strings.TrimSpace(string(b))
+	}
+	if password == "" {
+		return "", errors.New("password required (pass --password or stdin)")
+	}
+	return password, nil
+}
+
+func validateAdminPassword(password string) error {
+	if len(password) < minAdminPasswordLen {
+		return fmt.Errorf("admin password must be at least %d characters", minAdminPasswordLen)
+	}
+	return nil
+}
+
+func generateAdminPassword(n int) (string, error) {
+	buf := make([]byte, n)
+	charset := []byte(adminPasswordChars)
+	for i := 0; i < n; {
+		var b [1]byte
+		if _, err := rand.Read(b[:]); err != nil {
+			return "", err
+		}
+		if int(b[0]) >= 256-(256%len(charset)) {
+			continue
+		}
+		buf[i] = charset[int(b[0])%len(charset)]
+		i++
+	}
+	return string(buf), nil
+}
+
+func loadAndValidateConfig() (config.Config, error) {
+	cfgPath := config.PathFromEnv()
+	cfg, err := config.Load(cfgPath)
+	if err != nil {
+		return config.Config{}, err
+	}
+	if err := cfg.Validate(); err != nil {
+		return config.Config{}, err
+	}
+	return cfg, nil
+}

cmd/nixmsg/backup.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"git.asio.asia/nixevol/NixMsg/internal/store"
+)
+
+func cmdBackup(args []string) error {
+	outPath, err := parseBackupArgs(args)
+	if err != nil {
+		return err
+	}
+	cfg, err := loadAndValidateConfig()
+	if err != nil {
+		return err
+	}
+	if dir := filepath.Dir(outPath); dir != "" && dir != "." {
+		if mkErr := os.MkdirAll(dir, 0o755); mkErr != nil {
+			return fmt.Errorf("mkdir backup dir: %w", mkErr)
+		}
+	}
+	absOut, err := filepath.Abs(outPath)
+	if err != nil {
+		return err
+	}
+	ctx := context.Background()
+	// 对运行中的库：单独打开写连接执行 VACUUM INTO（可与 serve 并存，WAL 下安全）。
+	write, err := store.OpenWriter(cfg.DataDir, cfg.SQLiteSynchronous)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = write.Close() }()
+	if err := store.VacuumInto(ctx, write, filepath.ToSlash(absOut)); err != nil {
+		return err
+	}
+	fmt.Fprintf(os.Stderr, "backup written to %s\n", absOut)
+	return nil
+}
+
+func parseBackupArgs(args []string) (string, error) {
+	var out string
+	for i := 0; i < len(args); i++ {
+		switch args[i] {
+		case "--out":
+			if i+1 >= len(args) {
+				return "", errors.New("usage: nixmsg backup --out <file.db>")
+			}
+			out = args[i+1]
+			i++
+		default:
+			return "", fmt.Errorf("unknown argument: %s", args[i])
+		}
+	}
+	if out == "" {
+		return "", errors.New("usage: nixmsg backup --out <file.db>")
+	}
+	return out, nil
+}

cmd/nixmsg/checkconfig.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"git.asio.asia/nixevol/NixMsg/internal/config"
+)
+
+func cmdCheckConfig(args []string) error {
+	path := config.PathFromEnv()
+	if len(args) > 0 {
+		path = args[0]
+	}
+	cfg, err := config.Load(path)
+	if err != nil {
+		return err
+	}
+	if err := cfg.Validate(); err != nil {
+		return err
+	}
+	fmt.Fprintln(os.Stderr, "config ok")
+	return nil
+}

cmd/nixmsg/commands_test.go

@@ -0,0 +1,153 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"git.asio.asia/nixevol/NixMsg/internal/store"
+)
+
+func TestCheckConfigRejectsLargeBody(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "bad.yaml")
+	body := "listen: \":0\"\ndata_dir: \"" + filepath.ToSlash(dir) + "\"\nlimits:\n  max_body_bytes: 262145\n"
+	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv("NIXMSG_CONFIG", path)
+	err := cmdCheckConfig(nil)
+	if err == nil || !strings.Contains(err.Error(), "max_body_bytes") {
+		t.Fatalf("want max_body_bytes error, got %v", err)
+	}
+}
+
+func TestCheckConfigOK(t *testing.T) {
+	dir := t.TempDir()
+	path := writeTestConfig(t, dir)
+	t.Setenv("NIXMSG_CONFIG", path)
+	if err := cmdCheckConfig(nil); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestAdminInitOnceAndSetPassword(t *testing.T) {
+	dir := t.TempDir()
+	path := writeTestConfig(t, dir)
+	t.Setenv("NIXMSG_CONFIG", path)
+
+	var out bytes.Buffer
+	old := os.Stdout
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	os.Stdout = w
+	errInit := cmdAdminInit(nil)
+	_ = w.Close()
+	os.Stdout = old
+	_, _ = out.ReadFrom(r)
+	_ = r.Close()
+	if errInit != nil {
+		t.Fatal(errInit)
+	}
+	text := out.String()
+	if !strings.Contains(text, "admin password:") {
+		t.Fatalf("password not printed: %q", text)
+	}
+	pass := strings.TrimSpace(strings.TrimPrefix(strings.TrimSpace(text), "admin password:"))
+	if len(pass) != 20 {
+		t.Fatalf("password len=%d value=%q", len(pass), pass)
+	}
+
+	if err2 := cmdAdminInit(nil); err2 == nil || !strings.Contains(err2.Error(), "already initialized") {
+		t.Fatalf("want already initialized, got %v", err2)
+	}
+
+	if err2 := cmdAdminSetPassword([]string{"--password", "short"}); err2 == nil {
+		t.Fatal("expected short password error")
+	}
+	if err2 := cmdAdminSetPassword([]string{"--password", "long-enough-password"}); err2 != nil {
+		t.Fatal(err2)
+	}
+
+	db, openErr := store.Open(dir, "FULL")
+	if openErr != nil {
+		t.Fatal(openErr)
+	}
+	defer func() { _ = db.Close() }()
+	ok, hasErr := store.HasAdminPassword(context.Background(), db.Write)
+	if hasErr != nil || !ok {
+		t.Fatalf("has admin: ok=%v err=%v", ok, hasErr)
+	}
+}
+
+func TestBackupVacuumInto(t *testing.T) {
+	dir := t.TempDir()
+	path := writeTestConfig(t, dir)
+	t.Setenv("NIXMSG_CONFIG", path)
+	initAdminForTest(t, dir)
+
+	out := filepath.Join(dir, "backup", "copy.db")
+	if err := os.MkdirAll(filepath.Dir(out), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := cmdBackup([]string{"--out", out}); err != nil {
+		t.Fatal(err)
+	}
+	st, err := os.Stat(out)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if st.Size() == 0 {
+		t.Fatal("backup empty")
+	}
+}
+
+func TestHealthcheck(t *testing.T) {
+	dir := t.TempDir()
+	cfgPath := writeTestConfig(t, dir)
+	initAdminForTest(t, dir)
+	t.Setenv("NIXMSG_CONFIG", cfgPath)
+
+	cfg, err := loadAndValidateConfig()
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	errCh := make(chan error, 1)
+	go func() { errCh <- runServe(ctx, cfg) }()
+
+	deadline := time.Now().Add(10 * time.Second)
+	for time.Now().Before(deadline) {
+		if b, readErr := os.ReadFile(filepath.Join(dir, "listen.addr")); readErr == nil && strings.TrimSpace(string(b)) != "" {
+			break
+		}
+		time.Sleep(20 * time.Millisecond)
+	}
+
+	if err := cmdHealthcheck(nil); err != nil {
+		cancel()
+		<-errCh
+		t.Fatal(err)
+	}
+	cancel()
+	<-errCh
+}
+
+func TestParseSetPasswordArgs(t *testing.T) {
+	t.Parallel()
+	pass, err := parseSetPasswordArgs([]string{"--password", "abcdefghijkl"}, nil)
+	if err != nil || pass != "abcdefghijkl" {
+		t.Fatalf("pass=%q err=%v", pass, err)
+	}
+	pass, err = parseSetPasswordArgs([]string{"twelvechars!!"}, nil)
+	if err != nil || pass != "twelvechars!!" {
+		t.Fatalf("pass=%q err=%v", pass, err)
+	}
+}

cmd/nixmsg/healthcheck.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+func cmdHealthcheck(_ []string) error {
+	cfg, err := loadAndValidateConfig()
+	if err != nil {
+		return err
+	}
+	addrBytes, err := os.ReadFile(filepath.Join(cfg.DataDir, "listen.addr"))
+	if err != nil {
+		return fmt.Errorf("read listen.addr: %w", err)
+	}
+	addr := strings.TrimSpace(string(addrBytes))
+	if addr == "" {
+		return fmt.Errorf("listen.addr is empty")
+	}
+	url := "http://" + addr + "/healthz"
+	client := &http.Client{Timeout: 5 * time.Second}
+	resp, err := client.Get(url)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = resp.Body.Close() }()
+	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("healthz status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+	return nil
+}

cmd/nixmsg/main.go

@@ -10,16 +10,28 @@ func main() {
 		fmt.Fprintln(os.Stderr, "usage: nixmsg <command>")
 		os.Exit(2)
 	}
+	var err error
 	switch os.Args[1] {
 	case "version":
 		cmdVersion(os.Args[2:])
 	case "serve":
-		if err := cmdServe(os.Args[2:]); err != nil {
+		err = cmdServe(os.Args[2:])
-			fmt.Fprintln(os.Stderr, err)
+	// P-WIRE-BEGIN
-			os.Exit(1)
+	case "admin":
-		}
+		err = cmdAdmin(os.Args[2:])
+	case "backup":
+		err = cmdBackup(os.Args[2:])
+	case "check-config":
+		err = cmdCheckConfig(os.Args[2:])
+	case "healthcheck":
+		err = cmdHealthcheck(os.Args[2:])
+	// P-WIRE-END
 	default:
 		fmt.Fprintf(os.Stderr, "unknown command: %s\n", os.Args[1])
 		os.Exit(2)
 	}
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
 }

cmd/nixmsg/serve.go

@@ -4,11 +4,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
 	"net"
 	"net/http"
 	"os"
 	"os/signal"
 	"path/filepath"
+	"strings"
 	"syscall"
 	"time"
 
@@ -23,6 +25,12 @@ func cmdServe(_ []string) error {
 	if err != nil {
 		return err
 	}
+	// P-WIRE-BEGIN
+	if err := cfg.Validate(); err != nil {
+		return err
+	}
+	setupJSONLogger(cfg.Log)
+	// P-WIRE-END
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 	defer stop()
 	return runServe(ctx, cfg)
@@ -41,6 +49,16 @@ func runServe(ctx context.Context, cfg config.Config) error {
 	}
 	defer func() { _ = db.Close() }()
 
+	// P-WIRE-BEGIN
+	ok, err := store.HasAdminPassword(ctx, db.Write)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return errors.New("admin password not initialized; run: nixmsg admin init")
+	}
+	// P-WIRE-END
+
 	// 启动恢复入口已挂上（假实现为空操作）；M 线替换 message.Service 后生效。
 	if recoverErr := deps.Messages.RecoverOnStart(ctx); recoverErr != nil {
 		return fmt.Errorf("message recover: %w", recoverErr)
@@ -62,6 +80,17 @@ func runServe(ctx context.Context, cfg config.Config) error {
 		w.WriteHeader(http.StatusOK)
 		_, _ = w.Write([]byte("ok"))
 	})
+	// P-WIRE-BEGIN
+	mux.HandleFunc("GET /readyz", func(w http.ResponseWriter, r *http.Request) {
+		if readyErr := db.Ready(r.Context()); readyErr != nil {
+			slog.Error("readyz failed", "err", readyErr)
+			http.Error(w, "not ready", http.StatusServiceUnavailable)
+			return
+		}
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	})
+	// P-WIRE-END
 	// 确保前端资源被链接进二进制；完整静态托管由后续任务完善。
 	_ = web.Dist()
 
@@ -87,9 +116,17 @@ func runServe(ctx context.Context, cfg config.Config) error {
 
 	select {
 	case <-ctx.Done():
-		shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		// P-WIRE-BEGIN
+		// 先停止接受新连接，再等写队列最多 10 秒，然后断开并退出。
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 		defer cancel()
 		_ = srv.Shutdown(shutdownCtx)
+		drainCtx, drainCancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer drainCancel()
+		if drainErr := db.Queue.Drain(drainCtx); drainErr != nil && !errors.Is(drainErr, context.DeadlineExceeded) {
+			slog.Error("write queue drain", "err", drainErr)
+		}
+		// P-WIRE-END
 		serveErr := <-errCh
 		if serveErr != nil && !errors.Is(serveErr, http.ErrServerClosed) {
 			return serveErr
@@ -107,3 +144,20 @@ func writeListenAddr(dataDir, addr string) error {
 	path := filepath.Join(dataDir, "listen.addr")
 	return os.WriteFile(path, []byte(addr+"\n"), 0o644)
 }
+
+// P-WIRE-BEGIN
+func setupJSONLogger(cfg config.LogConfig) {
+	level := slog.LevelInfo
+	switch strings.ToLower(strings.TrimSpace(cfg.Level)) {
+	case "debug":
+		level = slog.LevelDebug
+	case "warn", "warning":
+		level = slog.LevelWarn
+	case "error":
+		level = slog.LevelError
+	}
+	h := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level})
+	slog.SetDefault(slog.New(h))
+}
+
+// P-WIRE-END

cmd/nixmsg/serve_test.go

@@ -10,23 +10,51 @@ import (
 	"testing"
 	"time"
 
+	"git.asio.asia/nixevol/NixMsg/internal/auth"
 	"git.asio.asia/nixevol/NixMsg/internal/config"
+	"git.asio.asia/nixevol/NixMsg/internal/store"
 )
 
+func writeTestConfig(t *testing.T, dataDir string) string {
+	t.Helper()
+	cfgPath := filepath.Join(dataDir, "config.yaml")
+	cfgYAML := []byte("listen: \"127.0.0.1:0\"\ndata_dir: \"" + filepath.ToSlash(dataDir) + "\"\nlog:\n  level: error\n")
+	if err := os.WriteFile(cfgPath, cfgYAML, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	return cfgPath
+}
+
+func initAdminForTest(t *testing.T, dataDir string) {
+	t.Helper()
+	db, err := store.Open(dataDir, "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = db.Close() }()
+	phc, err := auth.HashPassword("test-admin-password-xx")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := store.SetAdminPasswordHash(context.Background(), db.Write, phc); err != nil {
+		t.Fatal(err)
+	}
+}
+
 func TestServeHealthzAndListenAddr(t *testing.T) {
 	t.Parallel()
 
 	dataDir := t.TempDir()
-	cfgPath := filepath.Join(dataDir, "config.yaml")
+	cfgPath := writeTestConfig(t, dataDir)
-	cfgYAML := []byte("listen: \"127.0.0.1:0\"\ndata_dir: \"" + filepath.ToSlash(dataDir) + "\"\n")
+	initAdminForTest(t, dataDir)
-	if err := os.WriteFile(cfgPath, cfgYAML, 0o644); err != nil {
-		t.Fatal(err)
-	}
 
 	cfg, err := config.Load(cfgPath)
 	if err != nil {
 		t.Fatal(err)
 	}
+	if vErr := cfg.Validate(); vErr != nil {
+		t.Fatal(vErr)
+	}
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -37,7 +65,7 @@ func TestServeHealthzAndListenAddr(t *testing.T) {
 	}()
 
 	var addr string
-	deadline := time.Now().Add(5 * time.Second)
+	deadline := time.Now().Add(10 * time.Second)
 	for time.Now().Before(deadline) {
 		b, readErr := os.ReadFile(filepath.Join(dataDir, "listen.addr"))
 		if readErr == nil {
@@ -65,6 +93,15 @@ func TestServeHealthzAndListenAddr(t *testing.T) {
 		t.Fatalf("unexpected body: %q", body)
 	}
 
+	ready, err := http.Get("http://" + addr + "/readyz")
+	if err != nil {
+		t.Fatalf("readyz: %v", err)
+	}
+	defer func() { _ = ready.Body.Close() }()
+	if ready.StatusCode != http.StatusOK {
+		t.Fatalf("readyz status=%d", ready.StatusCode)
+	}
+
 	if _, err := os.Stat(filepath.Join(dataDir, "nixmsg.db")); err != nil {
 		t.Fatalf("db missing: %v", err)
 	}
@@ -75,7 +112,23 @@ func TestServeHealthzAndListenAddr(t *testing.T) {
 		if err != nil {
 			t.Fatalf("serve exit: %v", err)
 		}
-	case <-time.After(5 * time.Second):
+	case <-time.After(10 * time.Second):
 		t.Fatal("serve did not stop")
 	}
 }
+
+func TestServeRejectsWithoutAdmin(t *testing.T) {
+	t.Parallel()
+	dataDir := t.TempDir()
+	cfgPath := writeTestConfig(t, dataDir)
+	cfg, err := config.Load(cfgPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	err = runServe(ctx, cfg)
+	if err == nil || !strings.Contains(err.Error(), "admin password") {
+		t.Fatalf("want admin init error, got %v", err)
+	}
+}

docs/DEVIATIONS.md

@@ -152,11 +152,129 @@
 
 ## 平台 P
 
-暂无。
+### P1 2026-09-30
+
+1. **admin set-password 传参方式**  
+   - 原条款：DEVELOPMENT 11.2 仅列命令名，未规定密码如何传入。  
+   - 实际做法：支持 `--password <pwd>`、位置参数，或从 stdin 读一行；最短 12 位。  
+   - 原因：自动化测试与 Docker 非交互环境需要非交互传参。  
+   - 备选方案：仅交互式 prompt。  
+   - 影响：运维文档需写明推荐用 `--password` 或管道，勿把密码写进 shell 历史时可改用 stdin。
+
+2. **admin init 密码字符集**  
+   - 原条款：生成 20 位密码，未规定字符集。  
+   - 实际做法：从去掉易混字符（0/O/1/I/l）的字母数字中均匀抽样 20 位。  
+   - 原因：终端抄写友好。  
+   - 备选方案：全 ASCII 可打印字符。  
+   - 影响：熵略低于全字符集，对 20 位仍足够。
+
+3. **PHC 哈希辅助先放在 auth，池在 P3**  
+   - 原条款：argon2 并发池属 P3；admin init 需落库哈希属 P1。  
+   - 实际做法：P1 在 `internal/auth` 提供 `HashPassword`/`VerifyPassword`（PHC），admin 命令直接调用；P3 再用同参数实现带并发上限的 `HashPool`。  
+   - 原因：避免 P1 在 cmd 内复制算法，又不等到 P3 才做 init。  
+   - 备选方案：P1 cmd 内联 argon2；或 P1/P3 合并提交。  
+   - 影响：P3 合入后 admin 可改为走 HashPool（非必须，单次 init 无并发压力）。
+
+4. **优雅停机顺序**  
+   - 原条款：停接受 → 写队列最多 10 秒 → 断开连接退出。  
+   - 实际做法：`http.Server.Shutdown`（先停接受并等待进行中的 HTTP）后，再 `Queue.Drain` 最多 10 秒；本期尚无长连接表，断开连接由 Shutdown 覆盖。  
+   - 原因：当前 main 仅有 HTTP 健康检查；N 线接入后应在 Drain 前后显式踢连接。  
+   - 备选方案：先关 listener、Drain、再 Shutdown。  
+   - 影响：有 MQTT 长连接后需 N/P 联调停机路径。
+
+### P2 2026-09-30
+
+1. **合并写入队列替换 T0.3 简单实现**  
+   - 原条款：DEVELOPMENT 7.2；TASKS P2。  
+   - 实际做法：单写 goroutine；批次上限 256 或等待 2ms；每操作用 `SAVEPOINT`/`ROLLBACK TO`/`RELEASE`；Begin/Commit/SAVEPOINT 基础设施失败返回 `errors.Join(ErrBusy, err)` 并令 `IsReady()=false`；业务操作错误只回滚该 SAVEPOINT，不标 busy。  
+   - 原因：满足每秒约 200 条写入的落盘合并需求。  
+   - 备选方案：按固定时间窗无条件合并。  
+   - 影响：调用方需用 `errors.Is(err, store.ErrBusy)` 映射协议 `busy`；`/readyz` 读 `DB.Ready`。
+
+2. **调用方 context 取消与已入队任务**  
+   - 原条款：未规定入队后取消。  
+   - 实际做法：入队前检查 ctx；批次执行前再检查；若调用方在等待结果时取消，最多再等 30 秒取结果以免泄漏。  
+   - 原因：写 goroutine 仍可能已执行该操作，不能静默丢结果。  
+   - 备选方案：取消即从队列摘除（需可取消数据结构）。  
+   - 影响：极端取消场景下调用方可能多等一会儿。
+
+### P3 2026-09-30
+
+1. **管理员/注册锁定阈值沿用登录 IP 档**  
+   - 原条款：登录/对话密码阈值写清；管理员登录与注册安全码仅写「临时锁定」，未给数字。  
+   - 实际做法：`LockAdminIP`、`LockRegisterIP`、`LockTalkPair`/`LockLoginEndpointIP` 均为 5 分钟窗口 10 次、锁 5 分钟；`LockTalkTarget`/`LockLoginEndpoint` 为 1 小时 50 次、锁 1 小时。  
+   - 原因：与 PRD D18/F23「默认 5 分钟 10 次」叙述一致。  
+   - 备选方案：管理员单独更严阈值。  
+   - 影响：A/I/N 线直接用 `LoginLocks` 即可。
+
+2. **真实 auth 实现未改 wire.go**  
+   - 原条款：平台不改 `wire.go`；P3 实现接口。  
+   - 实际做法：提供 `NewPool`/`NewSessionTokens`/`NewAPITokens`/`NewLoginLocks`；`wire()` 仍用 Stub，由总控或各线接线时替换。  
+   - 原因：分工禁止改 wire.go。  
+   - 备选方案：在 serve 旁路替换（会绕过 wire）。  
+   - 影响：合入后需有一次接线才能在进程内用上真实哈希池。
+
+3. **令牌随机部分用 RawURLEncoding**  
+   - 原条款：32 字节随机数的 base64url。  
+   - 实际做法：`encoding/base64.RawURLEncoding`（无 padding）。  
+   - 原因：URL/Header 友好，与常见 token 惯例一致。  
+   - 备选方案：StdEncoding 带 padding。  
+   - 影响：SDK/文档示例需无 `=` 结尾。
+
+### P4 2026-09-30
+
+1. **指标包放在 `internal/metrics`**  
+   - 原条款：TASKS 分工表未列 metrics 目录；P4 要求用 prometheus/client_golang 建注册表。  
+   - 实际做法：新建 `internal/metrics`，提供 `New`/`Handler`/`Registry` 字段供各线打点；不在 `serve` 挂路由（访问规则属 A 线）。  
+   - 原因：不宜塞进 auth/store/config。  
+   - 备选方案：放 `internal/httpx`（A 线目录）。  
+   - 影响：A/N 接线时 import 本包并挂 `/metrics`。
+
+2. **指标命名**  
+   - 原条款：列了指标含义，未规定 Prometheus 名字。  
+   - 实际做法：`nixmsg_connections{transport}`、`nixmsg_endpoints`、`nixmsg_deliveries_pending`、`nixmsg_messages_scheduled`、`nixmsg_dispatch_to_push_duration_seconds`、`nixmsg_ack_duration_seconds`、`nixmsg_write_queue_length`、`nixmsg_write_batch_commit_duration_seconds`、`nixmsg_password_hash_queue_length`、`nixmsg_errors_total{code}`。  
+   - 原因：固定可抓取文本便于联调。  
+   - 备选方案：更短前缀或 HistogramVec。  
+   - 影响：仪表盘按上述名字配置。
 
 ## 连接 N
 
-暂无。
+### N1 / N2 2026-09-30
+
+1. **未接线 `cmd/nixmsg`**  
+   - 原条款：serve 最终应挂上端口识别、broker、`/mqtt`。  
+   - 实际做法：本任务只交付 `internal/listener`、`internal/broker`；按总控要求不改 `cmd/nixmsg`。  
+   - 原因：避免与平台/总控并行改 wire 冲突；合并时再接线。  
+   - 备选方案：本分支顺带改 `wire.go`（与指令冲突）。  
+   - 影响：当前 `serve` 仍是 T0.4 的简单 `/healthz` 监听，不含 MQTT。
+
+2. **`listen.addr` / `admin.addr` 仅端口为 0 时写入**  
+   - 原条款：DEVELOPMENT 4.1「端口写 0 时」写地址文件；T0.1 偏差曾改为 always write。  
+   - 实际做法：`listener.Server` 仅当配置地址端口为 `0` 时写 `listen.addr` / `admin.addr`。  
+   - 原因：本任务说明与 DEVELOPMENT 4.1 字面一致；T0.1 的 always write 在 `cmd/nixmsg`，本线未改。  
+   - 备选方案：接线时统一为 always write 以兼容 harness。  
+   - 影响：固定端口场景下 harness 若只读地址文件会读不到；接线时建议沿用 T0.1 超集或改 harness。
+
+3. **登录校验为可替换接口，默认拒绝**  
+   - 原条款：第 5 节完整会话令牌/密码/锁定属 N3。  
+   - 实际做法：`broker.Authenticator` 接口 + 默认 `RejectAuthenticator`；内部错误在 `OnConnect` 返回 error；测试提供 `AllowAuthenticator`。  
+   - 原因：N3 范围；N2 需可跑通装配与钩子。  
+   - 备选方案：N2 内做假登录表（超出范围）。  
+   - 影响：真实端连不上直到 N3；总控接线时注入 Authenticator。
+
+4. **大帧并发名额释放策略**  
+   - 原条款：DEVELOPMENT 7.5 大于 64KiB 全局同时不超过 64；PUBACK / 超时 / 断线释放。  
+   - 实际做法：发布前申请名额；QoS 0 发布成功立即释放；QoS 1 在 `OnQosComplete` 且 payload>64KiB 时释放，断线 `releaseAllLarge`；未单独做「确认超时」计时释放（确认超时属 M 线推送循环）。  
+   - 原因：N2 无投递确认计时器；与 M 线推送超时释放衔接。  
+   - 备选方案：broker 内对大帧自建超时（与 M 重复）。  
+   - 影响：若客户端永不 PUBACK 且不断线，名额可能占满直到断开；M 线超时踢线或回调 Disconnect 可释放。
+
+5. **`OnPublishDropped` 仅打日志**  
+   - 原条款：清「已推送」标记并 1 秒后重推。  
+   - 实际做法：钩子记录 debug 日志；清标记/重推留给消息 M。  
+   - 原因：投递状态在 M/store，N2 无投递表。  
+   - 备选方案：N2 暴露回调给 M 注册。  
+   - 影响：接线后 M 需订阅或包装该钩子；当前接口可后续加 `OnPublishDropped` 回调字段。
 
 ## 消息 M
 

go.mod

@@ -3,17 +3,30 @@ module git.asio.asia/nixevol/NixMsg
 go 1.27
 
 require (
+	github.com/coder/websocket v1.8.14
+	github.com/mochi-mqtt/server/v2 v2.7.9
+	github.com/prometheus/client_golang v1.24.1
 	go.yaml.in/yaml/v3 v3.0.5
+	golang.org/x/crypto v0.57.0
 	modernc.org/sqlite v1.60.1
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.70.1 // indirect
+	github.com/prometheus/procfs v0.21.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rs/xid v1.4.0 // indirect
 	golang.org/x/sys v0.48.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 	modernc.org/libc v1.77.1 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.12.1 // indirect

go.sum

@@ -1,19 +1,61 @@
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/coder/websocket v1.8.14 h1:9L0p0iKiNOibykf283eHkKUHHrpG7f65OE3BhhO7v9g=
+github.com/coder/websocket v1.8.14/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3 h1:LMLX+LgTNWpfvCBdFebv6EsYotImrt/Ppc5cXIriCSo=
 github.com/google/pprof v0.0.0-20260802141513-ef3492d7dac3/go.mod h1:jl5iWTm0/hd5PjEYEOuwAJ57L/CibdZfrqZ5XA5GrCk=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/jinzhu/copier v0.3.5 h1:GlvfUwHk62RokgqVNvYsku0TATCF7bAHVwEXoBh3iJg=
+github.com/jinzhu/copier v0.3.5/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
+github.com/klauspost/compress v1.19.1 h1:VsB4HPswih7mmZ8WleSFQ75c/Ui1M4trX5oAsJnhSlk=
+github.com/klauspost/compress v1.19.1/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mattn/go-isatty v0.0.24 h1:tGZZoVgT/KiqK1c8ocVLeDS8BSWMRd47J3Lbz7vsReI=
 github.com/mattn/go-isatty v0.0.24/go.mod h1:nMCL3Zebbrt45jsMDgnfIwz6ydEQApk5oEI3HqDio6A=
+github.com/mochi-mqtt/server/v2 v2.7.9 h1:y0g4vrSLAag7T07l2oCzOa/+nKVLoazKEWAArwqBNYI=
+github.com/mochi-mqtt/server/v2 v2.7.9/go.mod h1:lZD3j35AVNqJL5cezlnSkuG05c0FCHSsfAKSPBOSbqc=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v1.24.1 h1:JnJkREXzWxUdCuPFpIWZiPispT9xVV59uiuyR2bPlnU=
+github.com/prometheus/client_golang v1.24.1/go.mod h1:F+oSRECHg4sse5ucfYpYDeIv/hu68Zo0uoHKetWnzcE=
+github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
+github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
+github.com/prometheus/common v0.70.1 h1:1HvjP4D5oL3t8RsPlwxA9onvvStjtIHYE5XuuwOi/PY=
+github.com/prometheus/common v0.70.1/go.mod h1:VdFUQDMZK3VLkurFUVhia6uys/0suUp86TJz5qbJRhc=
+github.com/prometheus/procfs v0.21.1 h1:GljZCt+zSTS+NZq88cyQ1LjZ+RCHp3uVuabBWA5+OJI=
+github.com/prometheus/procfs v0.21.1/go.mod h1:aB55Cww9pdSJVHk0hUf0inxWyyjPogFIjmHKYgMKmtY=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/rs/xid v1.4.0 h1:qd7wPTDkN6KQx2VmMBLrpHkiyQwgFXRnkOLacUiaSNY=
+github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+go.yaml.in/yaml/v2 v2.4.4 h1:tuyd0P+2Ont/d6e2rl3be67goVK4R6deVxCUX5vyPaQ=
+go.yaml.in/yaml/v2 v2.4.4/go.mod h1:gMZqIpDtDqOfM0uNfy0SkpRhvUryYH0Z6wdMYcacYXQ=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
+golang.org/x/crypto v0.57.0 h1:3ZVCjf8Ggz7zneR/EHRVx68Ctf+2pmIMP2UFhh9cC6M=
+golang.org/x/crypto v0.57.0/go.mod h1:Fdz0i5U6CoizGwLda9DttjSk6qlZo25zYNtR+ycvuZA=
 golang.org/x/mod v0.41.0 h1:qJmnOUb4YB+FsEuM3HcWucdZASCPGhsX6uljO6pog0c=
 golang.org/x/mod v0.41.0/go.mod h1:Ek9pY8RKWXwsWvd3rQiHYtMqkjSUV+s1Rj7j4H5Ur6o=
 golang.org/x/sync v0.23.0 h1:KameEIfc1IkluZyXWLn39Wd4tURc6GbCiISGiZm2bQk=
@@ -22,6 +64,10 @@ golang.org/x/sys v0.48.0 h1:bbX/i/6MgT9BVLM9RT1thmxL04yeTAhbEz4SyadbXoo=
 golang.org/x/sys v0.48.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
 golang.org/x/tools v0.50.0 h1:c2ifzfcuY7L90lZ2aKd8S4K2NpASF08SZx9ZuJkHmSU=
 golang.org/x/tools v0.50.0/go.mod h1:7ulVMw3831Mwi5EZD6RomGyffr4VFjuNYXf2BbCEAV0=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 modernc.org/cc/v4 v4.29.7 h1:q+NXGJ0bK3b4TXFYQQVr9pYETGnmwFWkrUzJnMya/Tg=
 modernc.org/cc/v4 v4.29.7/go.mod h1:OnovgIhbbMXMu1aISnJ0wvVD1KnW+cAUJkIrAWh+kVI=
 modernc.org/ccgo/v4 v4.36.1 h1:ZNIUZAryN0UgnJwtyxrdEzcFc3yD4Cu4AzjfPXsLsIE=

internal/auth/auth_real_test.go

@@ -0,0 +1,140 @@
+package auth
+
+import (
+	"context"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestPoolLimitsConcurrency(t *testing.T) {
+	pool := NewPoolSize(1)
+	errCh := make(chan error, 3)
+	var wg sync.WaitGroup
+	wg.Add(3)
+	for i := 0; i < 3; i++ {
+		go func() {
+			defer wg.Done()
+			_, err := pool.Hash(context.Background(), PasswordLogin, "concurrency-test-password")
+			errCh <- err
+		}()
+	}
+	wg.Wait()
+	close(errCh)
+	for err := range errCh {
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	if pool.MaxActive() > 1 {
+		t.Fatalf("max active=%d want <=1", pool.MaxActive())
+	}
+	if pool.MaxActive() < 1 {
+		t.Fatal("expected at least one active hash")
+	}
+}
+
+func TestPoolHashVerifyRoundTrip(t *testing.T) {
+	pool := NewPoolSize(2)
+	ctx := context.Background()
+	phc, err := pool.Hash(ctx, PasswordAdmin, "round-trip-password-1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.HasPrefix(phc, "$argon2id$") {
+		t.Fatalf("phc=%q", phc)
+	}
+	ok, err := pool.Verify(ctx, PasswordAdmin, "round-trip-password-1", phc)
+	if err != nil || !ok {
+		t.Fatalf("ok=%v err=%v", ok, err)
+	}
+	ok, err = pool.Verify(ctx, PasswordAdmin, "wrong-password-xxxxx", phc)
+	if err != nil || ok {
+		t.Fatalf("mismatch ok=%v err=%v", ok, err)
+	}
+}
+
+func TestSessionAndAPITokens(t *testing.T) {
+	s := NewSessionTokens()
+	tok, hash, err := s.Issue(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.HasPrefix(tok, "nst_") {
+		t.Fatalf("tok=%q", tok)
+	}
+	if !s.LooksLikeSessionToken(tok) {
+		t.Fatal("LooksLikeSessionToken")
+	}
+	if !EqualHash(hash, s.HashToken(tok)) {
+		t.Fatal("hash mismatch")
+	}
+
+	a := NewAPITokens()
+	atok, ahash, err := a.Issue(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.HasPrefix(atok, "nxm_") {
+		t.Fatalf("atok=%q", atok)
+	}
+	if !a.LooksLikeAPIToken(atok) || !EqualHash(ahash, a.HashToken(atok)) {
+		t.Fatal("api token hash")
+	}
+	if EqualHash(hash, ahash) {
+		t.Fatal("session and api hashes should differ")
+	}
+}
+
+func TestLoginLocksWindowAndExpiry(t *testing.T) {
+	locks := NewLoginLocks()
+	now := time.Date(2026, 9, 30, 12, 0, 0, 0, time.UTC)
+	locks.SetClock(func() time.Time { return now })
+
+	key := LockKey{Kind: LockLoginEndpointIP, EndpointID: "e1", IP: "1.2.3.4"}
+	for i := 0; i < 9; i++ {
+		locked, _ := locks.Fail(key)
+		if locked {
+			t.Fatalf("locked early at %d", i+1)
+		}
+		now = now.Add(time.Second)
+	}
+	locked, retry := locks.Fail(key)
+	if !locked || retry <= 0 {
+		t.Fatalf("want lock, locked=%v retry=%v", locked, retry)
+	}
+	locked, _ = locks.Check(key)
+	if !locked {
+		t.Fatal("check should be locked")
+	}
+
+	now = now.Add(5*time.Minute + time.Second)
+	locked, _ = locks.Check(key)
+	if locked {
+		t.Fatal("should unlock after window")
+	}
+	locked, _ = locks.Fail(key)
+	if locked {
+		t.Fatal("after expiry should not still be locked on first fail")
+	}
+}
+
+func TestLoginLocksClearEndpoint(t *testing.T) {
+	locks := NewLoginLocks()
+	k1 := LockKey{Kind: LockLoginEndpointIP, EndpointID: "e1", IP: "1.1.1.1"}
+	k2 := LockKey{Kind: LockLoginEndpoint, EndpointID: "e1"}
+	k3 := LockKey{Kind: LockLoginEndpointIP, EndpointID: "e2", IP: "1.1.1.1"}
+	for i := 0; i < 10; i++ {
+		locks.Fail(k1)
+		locks.Fail(k2)
+	}
+	locks.Fail(k3)
+	locks.ClearEndpoint("e1")
+	if locked, _ := locks.Check(k1); locked {
+		t.Fatal("e1 ip lock should clear")
+	}
+	if locked, _ := locks.Check(k2); locked {
+		t.Fatal("e1 total lock should clear")
+	}
+}

internal/auth/locks.go

@@ -0,0 +1,155 @@
+package auth
+
+import (
+	"sync"
+	"time"
+)
+
+type lockPolicy struct {
+	window   time.Duration
+	maxFails int
+	lockFor  time.Duration
+}
+
+func policyFor(kind LockKind) lockPolicy {
+	switch kind {
+	case LockLoginEndpoint, LockTalkTarget:
+		return lockPolicy{window: time.Hour, maxFails: 50, lockFor: time.Hour}
+	default:
+		// LockLoginEndpointIP、LockTalkPair、LockAdminIP、LockRegisterIP
+		return lockPolicy{window: 5 * time.Minute, maxFails: 10, lockFor: 5 * time.Minute}
+	}
+}
+
+type lockEntry struct {
+	fails       []time.Time
+	lockedUntil time.Time
+}
+
+// MemoryLocks 是内存锁定计数器（重启清零）。
+type MemoryLocks struct {
+	mu      sync.Mutex
+	entries map[string]*lockEntry
+	now     func() time.Time
+}
+
+// NewLoginLocks 创建默认锁定计数器。
+func NewLoginLocks() *MemoryLocks {
+	return &MemoryLocks{
+		entries: make(map[string]*lockEntry),
+		now:     time.Now,
+	}
+}
+
+// SetClock 注入时钟（测试到期解除）。
+func (l *MemoryLocks) SetClock(now func() time.Time) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if now == nil {
+		l.now = time.Now
+		return
+	}
+	l.now = now
+}
+
+func lockMapKey(key LockKey) string {
+	return string(key.Kind) + "|" + key.EndpointID + "|" + key.PeerID + "|" + key.IP
+}
+
+// Check 若当前已锁定返回 locked=true 与剩余时间。
+func (l *MemoryLocks) Check(key LockKey) (bool, time.Duration) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	now := l.now()
+	e := l.entries[lockMapKey(key)]
+	if e == nil {
+		return false, 0
+	}
+	if e.lockedUntil.After(now) {
+		return true, e.lockedUntil.Sub(now)
+	}
+	// 到期自动解除：清空锁定与窗口内失败（保留结构以便后续 Fail）。
+	if !e.lockedUntil.IsZero() && !e.lockedUntil.After(now) {
+		e.lockedUntil = time.Time{}
+		e.fails = nil
+	}
+	return false, 0
+}
+
+// Fail 记录一次失败；若因此触发锁定，返回 locked=true。
+func (l *MemoryLocks) Fail(key LockKey) (bool, time.Duration) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	now := l.now()
+	k := lockMapKey(key)
+	e := l.entries[k]
+	if e == nil {
+		e = &lockEntry{}
+		l.entries[k] = e
+	}
+	if e.lockedUntil.After(now) {
+		return true, e.lockedUntil.Sub(now)
+	}
+	if !e.lockedUntil.IsZero() {
+		e.lockedUntil = time.Time{}
+		e.fails = nil
+	}
+	pol := policyFor(key.Kind)
+	cutoff := now.Add(-pol.window)
+	kept := e.fails[:0]
+	for _, t := range e.fails {
+		if t.After(cutoff) {
+			kept = append(kept, t)
+		}
+	}
+	e.fails = append(kept, now)
+	if len(e.fails) >= pol.maxFails {
+		e.lockedUntil = now.Add(pol.lockFor)
+		e.fails = nil
+		return true, pol.lockFor
+	}
+	return false, 0
+}
+
+// ClearEndpoint 清除某端编号相关的登录锁定（两种都清）。
+func (l *MemoryLocks) ClearEndpoint(endpointID string) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	for k, e := range l.entries {
+		// kind|endpoint|peer|ip
+		parts := splitLockKey(k)
+		if len(parts) != 4 {
+			continue
+		}
+		kind, ep := LockKind(parts[0]), parts[1]
+		if ep != endpointID {
+			continue
+		}
+		if kind == LockLoginEndpointIP || kind == LockLoginEndpoint {
+			delete(l.entries, k)
+			_ = e
+		}
+	}
+}
+
+// Clear 清除精确键。
+func (l *MemoryLocks) Clear(key LockKey) {
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	delete(l.entries, lockMapKey(key))
+}
+
+func splitLockKey(k string) []string {
+	out := make([]string, 0, 4)
+	start := 0
+	for i := 0; i < len(k); i++ {
+		if k[i] == '|' {
+			out = append(out, k[start:i])
+			start = i + 1
+		}
+	}
+	out = append(out, k[start:])
+	return out
+}
+
+var _ LoginLocks = (*MemoryLocks)(nil)

internal/auth/phc.go

@@ -0,0 +1,90 @@
+package auth
+
+import (
+	"crypto/rand"
+	"crypto/subtle"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strings"
+
+	"golang.org/x/crypto/argon2"
+)
+
+// Argon2 参数（DEVELOPMENT 第 12 节 / OWASP 最低配置）。
+const (
+	ArgonMemoryKiB = 19 * 1024 // 19 MiB
+	ArgonTime      = 2
+	ArgonThreads   = 1
+	ArgonKeyLen    = 32
+	ArgonSaltLen   = 16
+)
+
+// ErrInvalidPHC 表示 PHC 字符串无法解析或参数不支持。
+var ErrInvalidPHC = errors.New("auth: invalid phc")
+
+// HashPassword 用 argon2id 生成 PHC 字符串（不含并发池；池见 HashPool）。
+func HashPassword(password string) (string, error) {
+	salt := make([]byte, ArgonSaltLen)
+	if _, err := rand.Read(salt); err != nil {
+		return "", err
+	}
+	hash := argon2.IDKey([]byte(password), salt, ArgonTime, ArgonMemoryKiB, ArgonThreads, ArgonKeyLen)
+	return encodePHC(salt, hash), nil
+}
+
+// VerifyPassword 常量时间比较密码与 PHC；不匹配时 ok=false 且 err=nil。
+func VerifyPassword(password, phc string) (bool, error) {
+	salt, hash, err := decodePHC(phc)
+	if err != nil {
+		return false, err
+	}
+	got := argon2.IDKey([]byte(password), salt, ArgonTime, ArgonMemoryKiB, ArgonThreads, ArgonKeyLen)
+	if subtle.ConstantTimeCompare(got, hash) == 1 {
+		return true, nil
+	}
+	return false, nil
+}
+
+func encodePHC(salt, hash []byte) string {
+	return fmt.Sprintf(
+		"$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
+		argon2.Version,
+		ArgonMemoryKiB,
+		ArgonTime,
+		ArgonThreads,
+		base64.RawStdEncoding.EncodeToString(salt),
+		base64.RawStdEncoding.EncodeToString(hash),
+	)
+}
+
+func decodePHC(phc string) (salt, hash []byte, err error) {
+	// $argon2id$v=19$m=19456,t=2,p=1$salt$hash
+	parts := strings.Split(phc, "$")
+	if len(parts) != 6 || parts[1] != "argon2id" {
+		return nil, nil, ErrInvalidPHC
+	}
+	var version int
+	if _, scanErr := fmt.Sscanf(parts[2], "v=%d", &version); scanErr != nil || version != argon2.Version {
+		return nil, nil, ErrInvalidPHC
+	}
+	var m, t, p int
+	if _, scanErr := fmt.Sscanf(parts[3], "m=%d,t=%d,p=%d", &m, &t, &p); scanErr != nil {
+		return nil, nil, ErrInvalidPHC
+	}
+	if m != ArgonMemoryKiB || t != ArgonTime || p != ArgonThreads {
+		return nil, nil, ErrInvalidPHC
+	}
+	salt, err = base64.RawStdEncoding.DecodeString(parts[4])
+	if err != nil {
+		return nil, nil, ErrInvalidPHC
+	}
+	hash, err = base64.RawStdEncoding.DecodeString(parts[5])
+	if err != nil {
+		return nil, nil, ErrInvalidPHC
+	}
+	if len(salt) == 0 || len(hash) == 0 {
+		return nil, nil, ErrInvalidPHC
+	}
+	return salt, hash, nil
+}

internal/auth/pool.go

@@ -0,0 +1,82 @@
+package auth
+
+import (
+	"context"
+	"runtime"
+	"sync/atomic"
+)
+
+// Pool 是 argon2id 并发池（DEVELOPMENT 第 12 节）。
+type Pool struct {
+	sem     chan struct{}
+	waiting atomic.Int64
+	active  atomic.Int64
+	maxSeen atomic.Int64 // 测试用：观察到的最大并发
+}
+
+// NewPool 创建大小为 CPU 核数的哈希池。
+func NewPool() *Pool {
+	return NewPoolSize(runtime.NumCPU())
+}
+
+// NewPoolSize 创建指定并发上限的哈希池（测试可传入 1）。
+func NewPoolSize(n int) *Pool {
+	if n < 1 {
+		n = 1
+	}
+	return &Pool{sem: make(chan struct{}, n)}
+}
+
+// Hash 在池内计算 PHC 格式哈希。
+func (p *Pool) Hash(ctx context.Context, _ PasswordKind, password string) (string, error) {
+	if err := p.acquire(ctx); err != nil {
+		return "", err
+	}
+	defer p.release()
+	return HashPassword(password)
+}
+
+// Verify 在池内校验；常量时间比较。
+func (p *Pool) Verify(ctx context.Context, _ PasswordKind, password, phc string) (bool, error) {
+	if err := p.acquire(ctx); err != nil {
+		return false, err
+	}
+	defer p.release()
+	return VerifyPassword(password, phc)
+}
+
+// QueueLen 返回等待获取池槽位的任务数。
+func (p *Pool) QueueLen() int {
+	return int(p.waiting.Load())
+}
+
+// MaxActive 返回曾达到的最大并发哈希数（测试用）。
+func (p *Pool) MaxActive() int {
+	return int(p.maxSeen.Load())
+}
+
+func (p *Pool) acquire(ctx context.Context) error {
+	p.waiting.Add(1)
+	select {
+	case p.sem <- struct{}{}:
+		p.waiting.Add(-1)
+		cur := p.active.Add(1)
+		for {
+			old := p.maxSeen.Load()
+			if cur <= old || p.maxSeen.CompareAndSwap(old, cur) {
+				break
+			}
+		}
+		return nil
+	case <-ctx.Done():
+		p.waiting.Add(-1)
+		return ctx.Err()
+	}
+}
+
+func (p *Pool) release() {
+	p.active.Add(-1)
+	<-p.sem
+}
+
+var _ HashPool = (*Pool)(nil)

internal/auth/tokens.go

@@ -0,0 +1,87 @@
+package auth
+
+import (
+	"context"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/subtle"
+	"encoding/base64"
+	"strings"
+)
+
+const (
+	sessionTokenPrefix = "nst_"
+	apiTokenPrefix     = "nxm_"
+	tokenRandomBytes   = 32
+)
+
+// SessionTokenService 生成与哈希端会话令牌。
+type SessionTokenService struct{}
+
+// NewSessionTokens 创建会话令牌服务。
+func NewSessionTokens() *SessionTokenService {
+	return &SessionTokenService{}
+}
+
+// Issue 生成 nst_ + 32 字节随机数的 base64url；返回明文与 SHA-256。
+func (s *SessionTokenService) Issue(_ context.Context) (string, []byte, error) {
+	return issuePrefixedToken(sessionTokenPrefix)
+}
+
+// HashToken 对令牌做 SHA-256。
+func (s *SessionTokenService) HashToken(token string) []byte {
+	sum := sha256.Sum256([]byte(token))
+	return sum[:]
+}
+
+// LooksLikeSessionToken 判断是否以 nst_ 开头。
+func (s *SessionTokenService) LooksLikeSessionToken(credential string) bool {
+	return strings.HasPrefix(credential, sessionTokenPrefix)
+}
+
+// APITokenService 生成与哈希 API 令牌。
+type APITokenService struct{}
+
+// NewAPITokens 创建 API 令牌服务。
+func NewAPITokens() *APITokenService {
+	return &APITokenService{}
+}
+
+// Issue 生成 nxm_ + 32 字节随机数的 base64url；返回明文与 SHA-256。
+func (s *APITokenService) Issue(_ context.Context) (string, []byte, error) {
+	return issuePrefixedToken(apiTokenPrefix)
+}
+
+// HashToken 对令牌做 SHA-256。
+func (s *APITokenService) HashToken(token string) []byte {
+	sum := sha256.Sum256([]byte(token))
+	return sum[:]
+}
+
+// LooksLikeAPIToken 判断是否以 nxm_ 开头。
+func (s *APITokenService) LooksLikeAPIToken(credential string) bool {
+	return strings.HasPrefix(credential, apiTokenPrefix)
+}
+
+// EqualHash 常量时间比较两个哈希。
+func EqualHash(a, b []byte) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	return subtle.ConstantTimeCompare(a, b) == 1
+}
+
+func issuePrefixedToken(prefix string) (string, []byte, error) {
+	raw := make([]byte, tokenRandomBytes)
+	if _, err := rand.Read(raw); err != nil {
+		return "", nil, err
+	}
+	tok := prefix + base64.RawURLEncoding.EncodeToString(raw)
+	sum := sha256.Sum256([]byte(tok))
+	return tok, sum[:], nil
+}
+
+var (
+	_ SessionTokens = (*SessionTokenService)(nil)
+	_ APITokens     = (*APITokenService)(nil)
+)

internal/broker/broker.go

@@ -0,0 +1,379 @@
+package broker
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"log/slog"
+	"net"
+	"sync"
+	"sync/atomic"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	mqtt "github.com/mochi-mqtt/server/v2"
+	"github.com/mochi-mqtt/server/v2/packets"
+)
+
+const (
+	maxClients           = 2000
+	maxPacketSize        = 786432
+	uplinkQueueSize      = 256
+	largeFrameBytes      = 64 * 1024
+	largeFrameSlots      = 64
+	packetOverheadBudget = 128 // 主题与 MQTT 包头预留
+	keepaliveMin         = 10
+	keepaliveMax         = 600
+)
+
+// ErrPayloadTooLarge 下行超过客户端 Maximum Packet Size（减包头预留）或 max_receive_bytes。
+var ErrPayloadTooLarge = errors.New("broker: payload exceeds client limit")
+
+// ErrNoConnection 目标端没有当前连接。
+var ErrNoConnection = errors.New("broker: no active connection")
+
+// AuthResult 是登录校验结论（N3 实现真实逻辑；N2 默认拒绝）。
+type AuthResult struct {
+	OK           bool
+	SessionToken string // 密码登录成功时由 N3 填写
+}
+
+// Authenticator 由 N3 实现；内部故障必须返回 error，不得当成密码错误。
+type Authenticator interface {
+	Authenticate(ctx context.Context, endpointID string, password []byte, remoteIP string) (AuthResult, error)
+}
+
+// RejectAuthenticator 默认拒绝所有客户端（CONNACK 用户名密码错误）。
+type RejectAuthenticator struct{}
+
+func (RejectAuthenticator) Authenticate(context.Context, string, []byte, string) (AuthResult, error) {
+	return AuthResult{OK: false}, nil
+}
+
+// AllowAuthenticator 测试用：允许任意编号。
+type AllowAuthenticator struct{}
+
+func (AllowAuthenticator) Authenticate(context.Context, string, []byte, string) (AuthResult, error) {
+	return AuthResult{OK: true}, nil
+}
+
+// Options 装配 broker。
+type Options struct {
+	Authenticator Authenticator
+	Uplink        port.UplinkHandler
+	Logger        *slog.Logger
+}
+
+// Broker 内置 mochi，不自带监听端口。
+type Broker struct {
+	server *mqtt.Server
+	auth   Authenticator
+	uplink port.UplinkHandler
+	log    *slog.Logger
+
+	hook *nixHook
+
+	connsMu  sync.RWMutex
+	current  map[string]*connState
+	byClient map[*mqtt.Client]*connState
+
+	queuesMu sync.Mutex
+	queues   map[string]*uplinkQueue
+
+	largeSem chan struct{}
+	closed   atomic.Bool
+}
+
+type connState struct {
+	connID        port.ConnID
+	endpointID    string
+	transport     port.Transport
+	remoteIP      string
+	client        *mqtt.Client
+	maxPacketSize uint32
+	maxRecvBytes  int
+	authOK        bool
+	authErr       error
+	sessionToken  string
+	largeHeld     int
+	mu            sync.Mutex
+}
+
+// New 创建并 Serve mochi（无监听器）。
+func New(opts Options) (*Broker, error) {
+	auth := opts.Authenticator
+	if auth == nil {
+		auth = RejectAuthenticator{}
+	}
+	uplink := opts.Uplink
+	if uplink == nil {
+		uplink = port.StubUplinkHandler{}
+	}
+	log := opts.Logger
+	if log == nil {
+		log = slog.Default()
+	}
+
+	caps := mqtt.NewDefaultServerCapabilities()
+	caps.MaximumClients = maxClients
+	caps.MaximumQos = 1
+	caps.MaximumPacketSize = maxPacketSize
+	caps.MaximumSessionExpiryInterval = 0
+	caps.ReceiveMaximum = 1024
+	caps.MaximumInflight = 1024
+	caps.MaximumClientWritesPending = 1024
+	caps.RetainAvailable = 0
+	caps.WildcardSubAvailable = 0
+	caps.SharedSubAvailable = 0
+	caps.TopicAliasMaximum = 0
+	caps.Compatibilities.ObscureNotAuthorized = true
+
+	srv := mqtt.New(&mqtt.Options{
+		InlineClient: true,
+		Capabilities: caps,
+		Logger:       log,
+	})
+
+	b := &Broker{
+		server:   srv,
+		auth:     auth,
+		uplink:   uplink,
+		log:      log,
+		current:  make(map[string]*connState),
+		byClient: make(map[*mqtt.Client]*connState),
+		queues:   make(map[string]*uplinkQueue),
+		largeSem: make(chan struct{}, largeFrameSlots),
+	}
+	b.hook = &nixHook{b: b}
+	if err := srv.AddHook(b.hook, nil); err != nil {
+		return nil, err
+	}
+	if err := srv.Serve(); err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+// Server 返回底层 mochi（测试用）。
+func (b *Broker) Server() *mqtt.Server { return b.server }
+
+// Close 关闭 broker。
+func (b *Broker) Close() error {
+	if b.closed.Swap(true) {
+		return nil
+	}
+	b.queuesMu.Lock()
+	for _, q := range b.queues {
+		q.close()
+	}
+	b.queuesMu.Unlock()
+	return b.server.Close()
+}
+
+// AttachTCP 把裸 TCP/TLS 连接交给 mochi；阻塞到连接结束。
+func (b *Broker) AttachTCP(conn net.Conn) error {
+	return b.server.EstablishConnection("tcp", conn)
+}
+
+// AttachWS 把 WebSocket NetConn 交给 mochi；阻塞到连接结束。
+func (b *Broker) AttachWS(conn net.Conn) error {
+	return b.server.EstablishConnection("ws", conn)
+}
+
+// PublishDown 实现 port.Downlink。
+func (b *Broker) PublishDown(ctx context.Context, endpointID string, connID port.ConnID, payload []byte, opts port.PublishOpts) error {
+	if b.closed.Load() {
+		return errors.New("broker: closed")
+	}
+	st := b.lookupConn(endpointID, connID)
+	if st == nil {
+		return ErrNoConnection
+	}
+
+	limit := effectivePayloadLimit(st.maxPacketSize, st.maxRecvBytes)
+	if limit > 0 && len(payload) > limit {
+		return ErrPayloadTooLarge
+	}
+
+	qos := opts.QoS
+	if qos > 1 {
+		qos = 1
+	}
+	topic := downTopic(endpointID)
+	large := len(payload) > largeFrameBytes
+
+	if large {
+		select {
+		case b.largeSem <- struct{}{}:
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+		st.mu.Lock()
+		st.largeHeld++
+		st.mu.Unlock()
+	}
+
+	if err := b.server.Publish(topic, payload, false, qos); err != nil {
+		if large {
+			b.releaseOneLarge(st)
+		}
+		return err
+	}
+	if large && qos == 0 {
+		b.releaseOneLarge(st)
+	}
+	return nil
+}
+
+func (b *Broker) releaseOneLarge(st *connState) {
+	st.mu.Lock()
+	if st.largeHeld > 0 {
+		st.largeHeld--
+		st.mu.Unlock()
+		select {
+		case <-b.largeSem:
+		default:
+		}
+		return
+	}
+	st.mu.Unlock()
+}
+
+func (b *Broker) releaseAllLarge(st *connState) {
+	st.mu.Lock()
+	n := st.largeHeld
+	st.largeHeld = 0
+	st.mu.Unlock()
+	for i := 0; i < n; i++ {
+		select {
+		case <-b.largeSem:
+		default:
+		}
+	}
+}
+
+// Disconnect 实现 port.ConnControl。
+func (b *Broker) Disconnect(_ context.Context, endpointID string, connID port.ConnID, reason port.DisconnectReason) error {
+	st := b.lookupConn(endpointID, connID)
+	if st == nil {
+		return ErrNoConnection
+	}
+	code := packets.CodeDisconnect
+	switch reason {
+	case port.DisconnectTakenOver:
+		code = packets.ErrSessionTakenOver
+	case port.DisconnectKicked, port.DisconnectFatal:
+		code = packets.ErrAdministrativeAction
+	}
+	return b.server.DisconnectClient(st.client, code)
+}
+
+func (b *Broker) lookupConn(endpointID string, connID port.ConnID) *connState {
+	b.connsMu.RLock()
+	defer b.connsMu.RUnlock()
+	if connID != "" {
+		for _, st := range b.byClient {
+			if st.endpointID == endpointID && st.connID == connID {
+				return st
+			}
+		}
+		return nil
+	}
+	return b.current[endpointID]
+}
+
+func downTopic(endpointID string) string {
+	return "nix/c/" + endpointID + "/down"
+}
+
+func upTopic(endpointID string) string {
+	return "nix/c/" + endpointID + "/up"
+}
+
+func effectivePayloadLimit(maxPacketSize uint32, maxRecvBytes int) int {
+	limit := 0
+	if maxPacketSize > 0 {
+		if maxPacketSize > packetOverheadBudget {
+			limit = int(maxPacketSize) - packetOverheadBudget
+		}
+	}
+	if maxRecvBytes > 0 {
+		if limit == 0 || maxRecvBytes < limit {
+			limit = maxRecvBytes
+		}
+	}
+	return limit
+}
+
+func randomConnID() port.ConnID {
+	var b [16]byte
+	_, _ = rand.Read(b[:])
+	return port.ConnID(hex.EncodeToString(b[:]))
+}
+
+func transportOf(cl *mqtt.Client) port.Transport {
+	if cl != nil && cl.Net.Listener == "ws" {
+		return port.TransportWS
+	}
+	return port.TransportTCP
+}
+
+func remoteIPOf(cl *mqtt.Client) string {
+	if cl == nil {
+		return ""
+	}
+	addr := cl.Net.Remote
+	if addr == "" && cl.Net.Conn != nil && cl.Net.Conn.RemoteAddr() != nil {
+		addr = cl.Net.Conn.RemoteAddr().String()
+	}
+	host, _, err := net.SplitHostPort(addr)
+	if err != nil {
+		return addr
+	}
+	return host
+}
+
+// SetMaxReceiveBytes 供 N3 握手后设置；0 表示不限。
+func (b *Broker) SetMaxReceiveBytes(endpointID string, connID port.ConnID, n int) {
+	st := b.lookupConn(endpointID, connID)
+	if st == nil {
+		return
+	}
+	st.mu.Lock()
+	st.maxRecvBytes = n
+	st.mu.Unlock()
+}
+
+// ConnInfoOf 返回连接信息（测试/N3）。
+func (b *Broker) ConnInfoOf(endpointID string) (port.ConnInfo, bool) {
+	b.connsMu.RLock()
+	st := b.current[endpointID]
+	b.connsMu.RUnlock()
+	if st == nil {
+		return port.ConnInfo{}, false
+	}
+	return port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}, true
+}
+
+func (b *Broker) enqueueUplink(endpointID string, conn port.ConnInfo, payload []byte) {
+	b.queuesMu.Lock()
+	q, ok := b.queues[endpointID]
+	if !ok {
+		q = newUplinkQueue(b, endpointID)
+		b.queues[endpointID] = q
+	}
+	b.queuesMu.Unlock()
+	q.push(uplinkItem{conn: conn, payload: payload})
+}
+
+var (
+	_ port.Downlink    = (*Broker)(nil)
+	_ port.ConnControl = (*Broker)(nil)
+)

internal/broker/broker_test.go

@@ -0,0 +1,259 @@
+package broker
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"testing"
+	"time"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	"github.com/coder/websocket"
+	"github.com/mochi-mqtt/server/v2/packets"
+)
+
+func TestWSCrossOriginAllowed(t *testing.T) {
+	b, err := New(Options{Authenticator: AllowAuthenticator{}})
+	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()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	c, _, err := websocket.Dial(ctx, "ws"+srv.URL[len("http"):]+"/mqtt", &websocket.DialOptions{
+		HTTPHeader:   http.Header{"Origin": []string{"https://other.example"}},
+		Subprotocols: []string{"mqtt"},
+	})
+	if err != nil {
+		t.Fatalf("cross-origin dial: %v", err)
+	}
+	defer func() { _ = c.Close(websocket.StatusNormalClosure, "") }()
+	if c.Subprotocol() != "mqtt" {
+		t.Fatalf("subprotocol=%q", c.Subprotocol())
+	}
+}
+
+func TestWSWrongSubprotocolClosed(t *testing.T) {
+	b, err := New(Options{Authenticator: AllowAuthenticator{}})
+	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()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	c, _, err := websocket.Dial(ctx, "ws"+srv.URL[len("http"):]+"/mqtt", &websocket.DialOptions{
+		HTTPHeader:   http.Header{"Origin": []string{"https://other.example"}},
+		Subprotocols: []string{"not-mqtt"},
+	})
+	if err != nil {
+		// 有的实现在握手阶段就失败；也算关闭
+		return
+	}
+	defer func() { _ = c.Close(websocket.StatusNormalClosure, "") }()
+
+	// 服务端应立刻关掉；后续读写会失败
+	c.SetReadLimit(16)
+	_, _, readErr := c.Read(ctx)
+	if readErr == nil {
+		t.Fatal("expected connection closed for wrong subprotocol")
+	}
+}
+
+func TestPublishDownExceedsClientMax(t *testing.T) {
+	b, err := New(Options{Authenticator: AllowAuthenticator{}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	clientDone := make(chan struct{})
+	r, w := net.Pipe()
+	go func() {
+		defer close(clientDone)
+		_ = b.AttachTCP(r)
+	}()
+
+	endpoint := "ep-limit"
+	connectAndSubscribe(t, w, endpoint, 200) // MaximumPacketSize=200 → payload limit 72
+
+	// 等会话建立
+	deadline := time.Now().Add(3 * time.Second)
+	for {
+		if _, ok := b.ConnInfoOf(endpoint); ok {
+			break
+		}
+		if time.Now().After(deadline) {
+			t.Fatal("session not established")
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+
+	big := bytes.Repeat([]byte("x"), 100) // > 200-128
+	pubErr := b.PublishDown(context.Background(), endpoint, "", big, port.PublishOpts{QoS: 1})
+	if !errors.Is(pubErr, ErrPayloadTooLarge) {
+		t.Fatalf("PublishDown err=%v want ErrPayloadTooLarge", pubErr)
+	}
+
+	// 合法大小应成功
+	small := []byte(`{"v":1,"type":"resp"}`)
+	if err := b.PublishDown(context.Background(), endpoint, "", small, port.PublishOpts{QoS: 0}); err != nil {
+		t.Fatalf("small publish: %v", err)
+	}
+
+	_ = w.Close()
+	select {
+	case <-clientDone:
+	case <-time.After(3 * time.Second):
+	}
+}
+
+func TestInternalAuthErrorDoesNotReturnBadPassword(t *testing.T) {
+	auth := &errAuthenticator{err: context.DeadlineExceeded}
+	b, err := New(Options{Authenticator: auth})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	r, w := net.Pipe()
+	errCh := make(chan error, 1)
+	go func() { errCh <- b.AttachTCP(r) }()
+
+	writeConnect(t, w, "ep-err", 30, 0)
+	// 不应收到 CONNACK（内部错误直接断开）
+	_ = w.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
+	buf := make([]byte, 64)
+	n, readErr := w.Read(buf)
+	if readErr == nil && n > 0 {
+		// 若收到包，不能是 bad username/password CONNACK (reason 0x86)
+		if n >= 2 && buf[0]>>4 == packets.Connack {
+			t.Fatalf("unexpected connack on internal error: %x", buf[:n])
+		}
+	}
+	_ = w.Close()
+	select {
+	case <-errCh:
+	case <-time.After(2 * time.Second):
+	}
+}
+
+func TestRejectUnknownByDefault(t *testing.T) {
+	b, err := New(Options{}) // RejectAuthenticator
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = b.Close() }()
+
+	r, w := net.Pipe()
+	go func() { _ = b.AttachTCP(r) }()
+	writeConnect(t, w, "ep-unknown", 30, 0)
+	_ = w.SetReadDeadline(time.Now().Add(2 * time.Second))
+	buf := make([]byte, 128)
+	n, err := io.ReadAtLeast(w, buf, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if buf[0]>>4 != packets.Connack {
+		t.Fatalf("want connack, got %x", buf[:n])
+	}
+	_ = w.Close()
+}
+
+type errAuthenticator struct {
+	err error
+	mu  sync.Mutex
+}
+
+func (a *errAuthenticator) Authenticate(context.Context, string, []byte, string) (AuthResult, error) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	return AuthResult{}, a.err
+}
+
+func connectAndSubscribe(t *testing.T, w net.Conn, endpoint string, maxPacket uint32) {
+	t.Helper()
+	writeConnect(t, w, endpoint, 30, maxPacket)
+	// read CONNACK
+	_ = w.SetReadDeadline(time.Now().Add(3 * time.Second))
+	buf := make([]byte, 256)
+	n, err := io.ReadAtLeast(w, buf, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if buf[0]>>4 != packets.Connack {
+		t.Fatalf("want connack got %x", buf[:n])
+	}
+	writeSubscribe(t, w, downTopic(endpoint))
+	// read SUBACK
+	n, err = io.ReadAtLeast(w, buf, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if buf[0]>>4 != packets.Suback {
+		t.Fatalf("want suback got %x", buf[:n])
+	}
+}
+
+func writeConnect(t *testing.T, w net.Conn, endpoint string, keepalive uint16, maxPacket uint32) {
+	t.Helper()
+	pk := packets.Packet{
+		FixedHeader:     packets.FixedHeader{Type: packets.Connect},
+		ProtocolVersion: 5,
+		Connect: packets.ConnectParams{
+			ProtocolName:     []byte("MQTT"),
+			Clean:            true,
+			ClientIdentifier: endpoint,
+			Keepalive:        keepalive,
+			UsernameFlag:     true,
+			Username:         []byte(endpoint),
+			PasswordFlag:     true,
+			Password:         []byte("test"),
+		},
+		Properties: packets.Properties{
+			MaximumPacketSize: maxPacket,
+		},
+	}
+	var buf bytes.Buffer
+	if err := pk.ConnectEncode(&buf); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := w.Write(buf.Bytes()); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func writeSubscribe(t *testing.T, w net.Conn, topic string) {
+	t.Helper()
+	pk := packets.Packet{
+		FixedHeader:     packets.FixedHeader{Type: packets.Subscribe, Qos: 1},
+		ProtocolVersion: 5,
+		PacketID:        1,
+		Filters: packets.Subscriptions{
+			{Filter: topic, Qos: 1},
+		},
+	}
+	var buf bytes.Buffer
+	if err := pk.SubscribeEncode(&buf); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := w.Write(buf.Bytes()); err != nil {
+		t.Fatal(err)
+	}
+}

internal/broker/hooks.go

@@ -0,0 +1,196 @@
+package broker
+
+import (
+	"bytes"
+	"context"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+	mqtt "github.com/mochi-mqtt/server/v2"
+	"github.com/mochi-mqtt/server/v2/packets"
+)
+
+type nixHook struct {
+	mqtt.HookBase
+	b *Broker
+}
+
+func (h *nixHook) ID() string { return "nixmsg" }
+
+func (h *nixHook) Provides(b byte) bool {
+	return bytes.Contains([]byte{
+		mqtt.OnConnect,
+		mqtt.OnConnectAuthenticate,
+		mqtt.OnACLCheck,
+		mqtt.OnPublish,
+		mqtt.OnPublishDropped,
+		mqtt.OnSessionEstablished,
+		mqtt.OnDisconnect,
+		mqtt.OnQosComplete,
+	}, []byte{b})
+}
+
+func (h *nixHook) OnConnect(cl *mqtt.Client, pk packets.Packet) error {
+	endpointID := string(pk.Connect.Username)
+	if endpointID == "" {
+		endpointID = pk.Connect.ClientIdentifier
+	}
+	remoteIP := remoteIPOf(cl)
+
+	st := &connState{
+		connID:        randomConnID(),
+		endpointID:    endpointID,
+		transport:     transportOf(cl),
+		remoteIP:      remoteIP,
+		client:        cl,
+		maxPacketSize: pk.Properties.MaximumPacketSize,
+	}
+
+	// 心跳校正：超出 10–600 秒就改写 Keepalive 并设 ServerKeepalive
+	ka := pk.Connect.Keepalive
+	if ka < keepaliveMin || ka > keepaliveMax {
+		if ka < keepaliveMin {
+			ka = keepaliveMin
+		}
+		if ka > keepaliveMax {
+			ka = keepaliveMax
+		}
+		cl.State.Keepalive = ka
+		cl.State.ServerKeepalive = true
+	}
+
+	res, err := h.b.auth.Authenticate(context.Background(), endpointID, pk.Connect.Password, remoteIP)
+	if err != nil {
+		st.authErr = err
+		h.rememberPending(cl, st)
+		return err // mochi 不回 CONNACK，直接断开
+	}
+	st.authOK = res.OK
+	st.sessionToken = res.SessionToken
+	h.rememberPending(cl, st)
+	return nil
+}
+
+func (h *nixHook) rememberPending(cl *mqtt.Client, st *connState) {
+	h.b.connsMu.Lock()
+	h.b.byClient[cl] = st
+	h.b.connsMu.Unlock()
+}
+
+func (h *nixHook) OnConnectAuthenticate(cl *mqtt.Client, _ packets.Packet) bool {
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil {
+		return false
+	}
+	// 内部故障已在 OnConnect 返回 error；此处只反映业务上的拒绝
+	return st.authOK
+}
+
+func (h *nixHook) OnACLCheck(cl *mqtt.Client, topic string, write bool) bool {
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil || st.endpointID == "" {
+		return false
+	}
+	up := upTopic(st.endpointID)
+	down := downTopic(st.endpointID)
+	if write {
+		return topic == up
+	}
+	return topic == down
+}
+
+func (h *nixHook) OnPublish(cl *mqtt.Client, pk packets.Packet) (packets.Packet, error) {
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil {
+		return pk, packets.CodeSuccessIgnore
+	}
+	payload := append([]byte(nil), pk.Payload...)
+	info := port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}
+	h.b.enqueueUplink(st.endpointID, info, payload)
+	return pk, packets.CodeSuccessIgnore
+}
+
+func (h *nixHook) OnPublishDropped(cl *mqtt.Client, pk packets.Packet) {
+	h.b.log.Debug("publish dropped", "client", cl.ID, "topic", pk.TopicName, "size", len(pk.Payload))
+}
+
+func (h *nixHook) OnSessionEstablished(cl *mqtt.Client, _ packets.Packet) {
+	h.b.connsMu.Lock()
+	st := h.b.byClient[cl]
+	if st != nil {
+		h.b.current[st.endpointID] = st
+	}
+	h.b.connsMu.Unlock()
+	if st == nil {
+		return
+	}
+	info := port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}
+	_ = h.b.uplink.OnSessionEstablished(context.Background(), info)
+}
+
+func (h *nixHook) OnDisconnect(cl *mqtt.Client, err error, _ bool) {
+	h.b.connsMu.Lock()
+	st := h.b.byClient[cl]
+	delete(h.b.byClient, cl)
+	if st != nil && h.b.current[st.endpointID] == st {
+		delete(h.b.current, st.endpointID)
+	}
+	h.b.connsMu.Unlock()
+	if st == nil {
+		return
+	}
+	h.b.releaseAllLarge(st)
+
+	reason := port.DisconnectNormal
+	if err != nil {
+		if code, ok := err.(packets.Code); ok {
+			switch code.Code {
+			case packets.ErrSessionTakenOver.Code:
+				reason = port.DisconnectTakenOver
+			case packets.ErrAdministrativeAction.Code:
+				reason = port.DisconnectKicked
+			}
+		}
+	}
+	info := port.ConnInfo{
+		ConnID:        st.connID,
+		EndpointID:    st.endpointID,
+		Transport:     st.transport,
+		RemoteIP:      st.remoteIP,
+		SessionToken:  st.sessionToken,
+		MaxPacketSize: st.maxPacketSize,
+	}
+	h.b.uplink.OnDisconnect(context.Background(), info, reason)
+}
+
+func (h *nixHook) OnQosComplete(cl *mqtt.Client, pk packets.Packet) {
+	if len(pk.Payload) <= largeFrameBytes {
+		return
+	}
+	h.b.connsMu.RLock()
+	st := h.b.byClient[cl]
+	h.b.connsMu.RUnlock()
+	if st == nil {
+		return
+	}
+	h.b.releaseOneLarge(st)
+}

internal/broker/queue.go

@@ -0,0 +1,45 @@
+package broker
+
+import (
+	"context"
+	"sync"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+)
+
+type uplinkItem struct {
+	conn    port.ConnInfo
+	payload []byte
+}
+
+// uplinkQueue 每端串行队列，长度 256，满了堵住 OnPublish（背压）。
+type uplinkQueue struct {
+	b          *Broker
+	endpointID string
+	ch         chan uplinkItem
+	once       sync.Once
+}
+
+func newUplinkQueue(b *Broker, endpointID string) *uplinkQueue {
+	q := &uplinkQueue{
+		b:          b,
+		endpointID: endpointID,
+		ch:         make(chan uplinkItem, uplinkQueueSize),
+	}
+	go q.loop()
+	return q
+}
+
+func (q *uplinkQueue) push(item uplinkItem) {
+	q.ch <- item // 满则阻塞读循环，形成背压
+}
+
+func (q *uplinkQueue) close() {
+	q.once.Do(func() { close(q.ch) })
+}
+
+func (q *uplinkQueue) loop() {
+	for item := range q.ch {
+		_ = q.b.uplink.HandleUplink(context.Background(), item.conn, item.payload)
+	}
+}

internal/broker/ws.go

@@ -0,0 +1,41 @@
+package broker
+
+import (
+	"context"
+	"net"
+	"net/http"
+
+	"git.asio.asia/nixevol/NixMsg/internal/listener"
+	"github.com/coder/websocket"
+)
+
+// WSHandler 返回 /mqtt 的 WebSocket 升级处理。
+// Accept 时 InsecureSkipVerify=true；之后检查 Subprotocol==mqtt。
+// NetConn 使用 Background 派生的 context，不用请求 Context。
+func (b *Broker) WSHandler(proxies *listener.ProxySet) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		c, err := websocket.Accept(w, r, &websocket.AcceptOptions{
+			Subprotocols:       []string{"mqtt"},
+			InsecureSkipVerify: true,
+		})
+		if err != nil {
+			return
+		}
+		if c.Subprotocol() != "mqtt" {
+			_ = c.Close(websocket.StatusPolicyViolation, "subprotocol must be mqtt")
+			return
+		}
+
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
+
+		nc := websocket.NetConn(ctx, c, websocket.MessageBinary)
+		if proxies != nil {
+			ip := proxies.ClientIP(r)
+			if ip != "" {
+				nc = listener.WithRemoteAddr(nc, &net.TCPAddr{IP: net.ParseIP(ip)})
+			}
+		}
+		_ = b.AttachWS(nc)
+	})
+}

internal/config/config.go

@@ -2,11 +2,16 @@ package config
 
 import (
 	"fmt"
+	"net"
 	"os"
+	"strings"
 
 	"go.yaml.in/yaml/v3"
 )
 
+// MaxBodyBytesCap 是 max_body_bytes 的硬上限（DEVELOPMENT 11.1）。
+const MaxBodyBytesCap = 262144
+
 // Config 对应 DEVELOPMENT 第 11.1 节的配置文件。
 type Config struct {
 	Listen               string        `yaml:"listen"`
@@ -65,7 +70,7 @@ func Default() Config {
 		TrustedProxies: nil,
 		DataDir:        "./data",
 		Limits: LimitsConfig{
-			MaxBodyBytes:          262144,
+			MaxBodyBytes:          MaxBodyBytesCap,
 			MaxMetaBytes:          4096,
 			MaxFrameBytes:         786432,
 			MaxTTLSeconds:         2592000,
@@ -101,16 +106,148 @@ func Load(path string) (Config, error) {
 	if err := yaml.Unmarshal(data, &cfg); err != nil {
 		return Config{}, fmt.Errorf("parse config: %w", err)
 	}
+	applyEmptyDefaults(&cfg)
+	return cfg, nil
+}
+
+func applyEmptyDefaults(cfg *Config) {
+	def := Default()
 	if cfg.Listen == "" {
-		cfg.Listen = Default().Listen
+		cfg.Listen = def.Listen
 	}
 	if cfg.DataDir == "" {
-		cfg.DataDir = Default().DataDir
+		cfg.DataDir = def.DataDir
 	}
 	if cfg.SQLiteSynchronous == "" {
-		cfg.SQLiteSynchronous = Default().SQLiteSynchronous
+		cfg.SQLiteSynchronous = def.SQLiteSynchronous
 	}
-	return cfg, nil
+	if cfg.Log.Level == "" {
+		cfg.Log.Level = def.Log.Level
+	}
+	if cfg.Limits.MaxBodyBytes == 0 {
+		cfg.Limits.MaxBodyBytes = def.Limits.MaxBodyBytes
+	}
+	if cfg.Limits.MaxMetaBytes == 0 {
+		cfg.Limits.MaxMetaBytes = def.Limits.MaxMetaBytes
+	}
+	if cfg.Limits.MaxFrameBytes == 0 {
+		cfg.Limits.MaxFrameBytes = def.Limits.MaxFrameBytes
+	}
+	if cfg.Limits.MaxTTLSeconds == 0 {
+		cfg.Limits.MaxTTLSeconds = def.Limits.MaxTTLSeconds
+	}
+	if cfg.Limits.MaxScheduleSeconds == 0 {
+		cfg.Limits.MaxScheduleSeconds = def.Limits.MaxScheduleSeconds
+	}
+	if cfg.Limits.MaxGroupMembers == 0 {
+		cfg.Limits.MaxGroupMembers = def.Limits.MaxGroupMembers
+	}
+	if cfg.Limits.GraceSeconds == 0 {
+		cfg.Limits.GraceSeconds = def.Limits.GraceSeconds
+	}
+	if cfg.Limits.AckTimeoutSeconds == 0 {
+		cfg.Limits.AckTimeoutSeconds = def.Limits.AckTimeoutSeconds
+	}
+	if cfg.Limits.DeliveryWindow == 0 {
+		cfg.Limits.DeliveryWindow = def.Limits.DeliveryWindow
+	}
+	if cfg.Limits.ReceiptWindow == 0 {
+		cfg.Limits.ReceiptWindow = def.Limits.ReceiptWindow
+	}
+	if cfg.Limits.RequestsPerSecond == 0 {
+		cfg.Limits.RequestsPerSecond = def.Limits.RequestsPerSecond
+	}
+}
+
+// Validate 校验 DEVELOPMENT 11.1 全部字段；拒绝 max_body_bytes > 262144。
+func (c Config) Validate() error {
+	var errs []string
+	if strings.TrimSpace(c.Listen) == "" {
+		errs = append(errs, "listen is required")
+	}
+	if strings.TrimSpace(c.DataDir) == "" {
+		errs = append(errs, "data_dir is required")
+	}
+	sync := strings.ToUpper(strings.TrimSpace(c.SQLiteSynchronous))
+	if sync != "FULL" && sync != "NORMAL" {
+		errs = append(errs, "sqlite_synchronous must be FULL or NORMAL")
+	}
+	switch strings.ToLower(strings.TrimSpace(c.Log.Level)) {
+	case "debug", "info", "warn", "warning", "error":
+	default:
+		errs = append(errs, "log.level must be debug, info, warn, or error")
+	}
+	if c.Limits.MaxBodyBytes <= 0 {
+		errs = append(errs, "limits.max_body_bytes must be > 0")
+	}
+	if c.Limits.MaxBodyBytes > MaxBodyBytesCap {
+		errs = append(errs, fmt.Sprintf("limits.max_body_bytes must be <= %d", MaxBodyBytesCap))
+	}
+	if c.Limits.MaxMetaBytes <= 0 {
+		errs = append(errs, "limits.max_meta_bytes must be > 0")
+	}
+	if c.Limits.MaxFrameBytes <= 0 {
+		errs = append(errs, "limits.max_frame_bytes must be > 0")
+	}
+	if c.Limits.MaxFrameBytes < c.Limits.MaxBodyBytes {
+		errs = append(errs, "limits.max_frame_bytes must be >= limits.max_body_bytes")
+	}
+	if c.Limits.MaxTTLSeconds <= 0 {
+		errs = append(errs, "limits.max_ttl_seconds must be > 0")
+	}
+	if c.Limits.MaxScheduleSeconds <= 0 {
+		errs = append(errs, "limits.max_schedule_seconds must be > 0")
+	}
+	if c.Limits.MaxGroupMembers <= 0 {
+		errs = append(errs, "limits.max_group_members must be > 0")
+	}
+	if c.Limits.GraceSeconds < 0 {
+		errs = append(errs, "limits.grace_seconds must be >= 0")
+	}
+	if c.Limits.AckTimeoutSeconds <= 0 {
+		errs = append(errs, "limits.ack_timeout_seconds must be > 0")
+	}
+	if c.Limits.DeliveryWindow <= 0 {
+		errs = append(errs, "limits.delivery_window must be > 0")
+	}
+	if c.Limits.ReceiptWindow <= 0 {
+		errs = append(errs, "limits.receipt_window must be > 0")
+	}
+	if c.Limits.RequestsPerSecond <= 0 {
+		errs = append(errs, "limits.requests_per_second must be > 0")
+	}
+	if c.Limits.MaxPendingPerSender < 0 {
+		errs = append(errs, "limits.max_pending_per_sender must be >= 0")
+	}
+	if c.Limits.MaxPendingPerReceiver < 0 {
+		errs = append(errs, "limits.max_pending_per_receiver must be >= 0")
+	}
+	if c.SessionIdleDays < 0 {
+		errs = append(errs, "session_idle_days must be >= 0")
+	}
+	if c.RecordRetentionDays < 0 {
+		errs = append(errs, "record_retention_days must be >= 0")
+	}
+	if c.IdempotencyHours < 0 {
+		errs = append(errs, "idempotency_hours must be >= 0")
+	}
+	if c.ReceiptRetentionDays < 0 {
+		errs = append(errs, "receipt_retention_days must be >= 0")
+	}
+	cert := strings.TrimSpace(c.TLS.CertFile)
+	key := strings.TrimSpace(c.TLS.KeyFile)
+	if (cert == "") != (key == "") {
+		errs = append(errs, "tls.cert_file and tls.key_file must both be set or both empty")
+	}
+	for _, cidr := range c.TrustedProxies {
+		if _, _, err := net.ParseCIDR(strings.TrimSpace(cidr)); err != nil {
+			errs = append(errs, fmt.Sprintf("trusted_proxies entry %q is not a valid CIDR", cidr))
+		}
+	}
+	if len(errs) > 0 {
+		return fmt.Errorf("invalid config: %s", strings.Join(errs, "; "))
+	}
+	return nil
 }
 
 // PathFromEnv 返回 NIXMSG_CONFIG 或默认 ./config.yaml。

internal/config/config_test.go

@@ -0,0 +1,62 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestValidateDefaultOK(t *testing.T) {
+	t.Parallel()
+	cfg := Default()
+	if err := cfg.Validate(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestValidateRejectsMaxBodyBytesTooLarge(t *testing.T) {
+	t.Parallel()
+	cfg := Default()
+	cfg.Limits.MaxBodyBytes = MaxBodyBytesCap + 1
+	err := cfg.Validate()
+	if err == nil {
+		t.Fatal("expected error")
+	}
+	if !strings.Contains(err.Error(), "max_body_bytes") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestLoadAndValidate(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+	path := filepath.Join(dir, "config.yaml")
+	body := "listen: \"127.0.0.1:0\"\ndata_dir: \"" + filepath.ToSlash(dir) + "\"\n"
+	if err := os.WriteFile(path, []byte(body), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	cfg, err := Load(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := cfg.Validate(); err != nil {
+		t.Fatal(err)
+	}
+	if cfg.Listen != "127.0.0.1:0" {
+		t.Fatalf("listen=%q", cfg.Listen)
+	}
+}
+
+func TestValidateTrustedProxies(t *testing.T) {
+	t.Parallel()
+	cfg := Default()
+	cfg.TrustedProxies = []string{"not-a-cidr"}
+	if err := cfg.Validate(); err == nil {
+		t.Fatal("expected error")
+	}
+	cfg.TrustedProxies = []string{"127.0.0.1/32"}
+	if err := cfg.Validate(); err != nil {
+		t.Fatal(err)
+	}
+}

internal/listener/chanlistener.go

@@ -0,0 +1,62 @@
+package listener
+
+import (
+	"net"
+	"sync"
+)
+
+// ChanListener 是从通道取连接的 net.Listener，交给同一个 http.Server。
+type ChanListener struct {
+	addr   net.Addr
+	ch     chan net.Conn
+	closed chan struct{}
+	once   sync.Once
+}
+
+// NewChanListener 创建缓冲通道监听器；addr 仅用于 Addr()。
+func NewChanListener(addr net.Addr, buf int) *ChanListener {
+	if buf < 1 {
+		buf = 64
+	}
+	if addr == nil {
+		addr = &net.TCPAddr{IP: net.IPv4zero, Port: 0}
+	}
+	return &ChanListener{
+		addr:   addr,
+		ch:     make(chan net.Conn, buf),
+		closed: make(chan struct{}),
+	}
+}
+
+// Addr 返回构造时给出的地址。
+func (l *ChanListener) Addr() net.Addr { return l.addr }
+
+// Accept 阻塞直到有连接或关闭。
+func (l *ChanListener) Accept() (net.Conn, error) {
+	select {
+	case <-l.closed:
+		return nil, net.ErrClosed
+	case c, ok := <-l.ch:
+		if !ok {
+			return nil, net.ErrClosed
+		}
+		return c, nil
+	}
+}
+
+// Close 关闭监听器并唤醒 Accept。
+func (l *ChanListener) Close() error {
+	l.once.Do(func() {
+		close(l.closed)
+	})
+	return nil
+}
+
+// Enqueue 把识别为 HTTP 的连接交给 http.Server；已关闭时丢弃并关闭连接。
+func (l *ChanListener) Enqueue(c net.Conn) {
+	select {
+	case <-l.closed:
+		_ = c.Close()
+	case l.ch <- c:
+	}
+}

internal/listener/conn.go

@@ -0,0 +1,76 @@
+package listener
+
+import (
+	"bufio"
+	"net"
+	"strconv"
+	"time"
+)
+
+const firstByteTimeout = 10 * time.Second
+
+// bufferedConn 把已读字节放回连接，供后续 TLS/HTTP/MQTT 继续读。
+type bufferedConn struct {
+	net.Conn
+	r *bufio.Reader
+}
+
+func (c *bufferedConn) Read(p []byte) (int, error) {
+	return c.r.Read(p)
+}
+
+func wrapBuffered(c net.Conn) *bufferedConn {
+	if bc, ok := c.(*bufferedConn); ok {
+		return bc
+	}
+	return &bufferedConn{Conn: c, r: bufio.NewReader(c)}
+}
+
+// peekFirstByte 在超时内读首字节并 Unread，返回仍可读完整流的连接。
+func peekFirstByte(c net.Conn) (net.Conn, byte, error) {
+	bc := wrapBuffered(c)
+	_ = bc.SetReadDeadline(time.Now().Add(firstByteTimeout))
+	b, err := bc.r.ReadByte()
+	_ = bc.SetReadDeadline(time.Time{})
+	if err != nil {
+		return nil, 0, err
+	}
+	if err := bc.r.UnreadByte(); err != nil {
+		return nil, 0, err
+	}
+	return bc, b, nil
+}
+
+// addrConn 只改 RemoteAddr，用于受信任代理后的真实 IP。
+type addrConn struct {
+	net.Conn
+	remote net.Addr
+}
+
+func (c *addrConn) RemoteAddr() net.Addr {
+	if c.remote != nil {
+		return c.remote
+	}
+	return c.Conn.RemoteAddr()
+}
+
+// WithRemoteAddr 包装连接，使 RemoteAddr 返回指定地址（通常是解析出的客户端 IP）。
+func WithRemoteAddr(c net.Conn, remote net.Addr) net.Conn {
+	if remote == nil {
+		return c
+	}
+	return &addrConn{Conn: c, remote: remote}
+}
+
+// TCPAddrFromIPPort 把 "ip:port" 或纯 IP 转成 *net.TCPAddr。
+func TCPAddrFromIPPort(ipPort string) *net.TCPAddr {
+	if ipPort == "" {
+		return &net.TCPAddr{}
+	}
+	host, portStr, err := net.SplitHostPort(ipPort)
+	if err != nil {
+		return &net.TCPAddr{IP: net.ParseIP(ipPort)}
+	}
+	port, _ := strconv.Atoi(portStr)
+	return &net.TCPAddr{IP: net.ParseIP(host), Port: port}
+}

internal/listener/listener_test.go

@@ -0,0 +1,398 @@
+package listener
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"io"
+	"math/big"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestIdentifyPlainHTTPAndMQTT(t *testing.T) {
+	dir := t.TempDir()
+	gotMQTT := make(chan net.Conn, 1)
+	mux := NewMux(RoleShared, Handlers{
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("ok"))
+		}),
+	})
+	s, err := New(Options{
+		Listen:         "127.0.0.1:0",
+		DataDir:        dir,
+		ClientHandler:  mux,
+		AllowPlaintext: true,
+		OnMQTT: func(c net.Conn) {
+			gotMQTT <- c
+			buf := make([]byte, 1)
+			_, _ = c.Read(buf)
+			_ = c.Close()
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	addr := s.ListenAddr()
+	if addr == "" {
+		t.Fatal("empty listen addr")
+	}
+	b, err := os.ReadFile(filepath.Join(dir, "listen.addr"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(b) != addr+"\n" {
+		t.Fatalf("listen.addr=%q want %q", b, addr+"\n")
+	}
+
+	resp, err := http.Get("http://" + addr + "/healthz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if resp.StatusCode != 200 || string(body) != "ok" {
+		t.Fatalf("healthz: %d %q", resp.StatusCode, body)
+	}
+
+	c, err := net.DialTimeout("tcp", addr, 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = c.Write([]byte{0x10, 0x00})
+	select {
+	case mc := <-gotMQTT:
+		_ = mc.Close()
+	case <-time.After(3 * time.Second):
+		t.Fatal("mqtt not delivered")
+	}
+	_ = c.Close()
+}
+
+func TestIdentifyTLSHTTPAndMQTT(t *testing.T) {
+	dir := t.TempDir()
+	certPath, keyPath := writeTestCert(t, dir, "old")
+	gotMQTT := make(chan net.Conn, 1)
+	mux := NewMux(RoleShared, Handlers{
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("tls-ok"))
+		}),
+	})
+	s, err := New(Options{
+		Listen:         "127.0.0.1:0",
+		DataDir:        dir,
+		CertFile:       certPath,
+		KeyFile:        keyPath,
+		AllowPlaintext: false,
+		ClientHandler:  mux,
+		OnMQTT: func(c net.Conn) {
+			gotMQTT <- c
+			_ = c.Close()
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	addr := s.ListenAddr()
+	tlsCfg := &tls.Config{InsecureSkipVerify: true}
+
+	// TLS + HTTP
+	tr := &http.Transport{TLSClientConfig: tlsCfg}
+	client := &http.Client{Transport: tr, Timeout: 5 * time.Second}
+	resp, err := client.Get("https://" + addr + "/healthz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if string(body) != "tls-ok" {
+		t.Fatalf("body=%q", body)
+	}
+
+	// TLS + MQTT (0x10 after handshake)
+	raw, err := tls.Dial("tcp", addr, tlsCfg)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = raw.Write([]byte{0x10})
+	select {
+	case mc := <-gotMQTT:
+		_ = mc.Close()
+	case <-time.After(3 * time.Second):
+		t.Fatal("tls mqtt not delivered")
+	}
+	_ = raw.Close()
+
+	// ALPN mqtt 客户端仍能握手（服务端不设 NextProtos）
+	alpn, err := tls.Dial("tcp", addr, &tls.Config{
+		InsecureSkipVerify: true,
+		NextProtos:         []string{"mqtt"},
+	})
+	if err != nil {
+		t.Fatalf("alpn mqtt handshake: %v", err)
+	}
+	_ = alpn.Close()
+}
+
+func TestCertReloadUsesNewCert(t *testing.T) {
+	dir := t.TempDir()
+	certPath, keyPath := writeTestCert(t, dir, "v1")
+	cr, err := NewCertReloader(certPath, keyPath, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer cr.Close()
+	old := cr.Certificate()
+	if old == nil {
+		t.Fatal("nil cert")
+	}
+
+	time.Sleep(20 * time.Millisecond) // 保证 mtime 变化
+	certPath2, keyPath2 := writeTestCert(t, dir, "v2")
+	// 覆盖原路径
+	data, _ := os.ReadFile(certPath2)
+	_ = os.WriteFile(certPath, data, 0o644)
+	data, _ = os.ReadFile(keyPath2)
+	_ = os.WriteFile(keyPath, data, 0o644)
+
+	if reloadErr := cr.ReloadNow(); reloadErr != nil {
+		t.Fatal(reloadErr)
+	}
+	neu := cr.Certificate()
+	if neu == nil || neu == old {
+		t.Fatal("certificate not reloaded")
+	}
+
+	// 完整服务：重载后新连接用新证书（用 Leaf CN 区分）
+	mux := NewMux(RoleShared, Handlers{})
+	s, err := New(Options{
+		Listen:        "127.0.0.1:0",
+		DataDir:       dir,
+		CertFile:      certPath,
+		KeyFile:       keyPath,
+		ClientHandler: mux,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	// 再换一版证书
+	time.Sleep(20 * time.Millisecond)
+	c3, k3 := writeTestCert(t, dir, "v3")
+	data, _ = os.ReadFile(c3)
+	_ = os.WriteFile(certPath, data, 0o644)
+	data, _ = os.ReadFile(k3)
+	_ = os.WriteFile(keyPath, data, 0o644)
+	if reloadErr := s.certs.ReloadNow(); reloadErr != nil {
+		t.Fatal(reloadErr)
+	}
+
+	conn, err := tls.Dial("tcp", s.ListenAddr(), &tls.Config{InsecureSkipVerify: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = conn.Close() }()
+	state := conn.ConnectionState()
+	if len(state.PeerCertificates) == 0 {
+		t.Fatal("no peer cert")
+	}
+	if cn := state.PeerCertificates[0].Subject.CommonName; cn != "v3" {
+		t.Fatalf("cn=%q want v3", cn)
+	}
+}
+
+func TestAdminSeparateMQTTClosedAndAdmin404OnListen(t *testing.T) {
+	dir := t.TempDir()
+	clientMux := NewMux(RoleClient, Handlers{
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("client"))
+		}),
+	})
+	adminMux := NewMux(RoleAdmin, Handlers{
+		AdminAPI: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("admin"))
+		}),
+		Healthz: http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			_, _ = w.Write([]byte("admin-health"))
+		}),
+	})
+	mqttSeen := make(chan struct{}, 1)
+	s, err := New(Options{
+		Listen:         "127.0.0.1:0",
+		AdminListen:    "127.0.0.1:0",
+		DataDir:        dir,
+		AllowPlaintext: true,
+		ClientHandler:  clientMux,
+		AdminHandler:   adminMux,
+		OnMQTT: func(c net.Conn) {
+			mqttSeen <- struct{}{}
+			_ = c.Close()
+		},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if startErr := s.Start(ctx); startErr != nil {
+		t.Fatal(startErr)
+	}
+	defer func() { _ = s.Close() }()
+
+	// listen 上 /api/admin/ 404
+	resp, err := http.Get("http://" + s.ListenAddr() + "/api/admin/x")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = resp.Body.Close()
+	if resp.StatusCode != 404 {
+		t.Fatalf("listen admin status=%d", resp.StatusCode)
+	}
+
+	// admin 上 API 可用
+	resp, err = http.Get("http://" + s.AdminAddr() + "/api/admin/x")
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if string(body) != "admin" {
+		t.Fatalf("admin body=%q", body)
+	}
+
+	// admin_listen 上裸 MQTT 关闭，不回调
+	ac, err := net.DialTimeout("tcp", s.AdminAddr(), 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = ac.Write([]byte{0x10})
+	time.Sleep(200 * time.Millisecond)
+	buf := make([]byte, 1)
+	_ = ac.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
+	_, readErr := ac.Read(buf)
+	_ = ac.Close()
+	if readErr == nil {
+		t.Fatal("expected admin mqtt connection closed")
+	}
+	select {
+	case <-mqttSeen:
+		t.Fatal("mqtt should not be accepted on admin")
+	default:
+	}
+
+	if _, err := os.ReadFile(filepath.Join(dir, "admin.addr")); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestTrustedProxyClientIP(t *testing.T) {
+	ps, err := ParseTrustedProxies([]string{"10.0.0.0/8", "192.168.1.1"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	r := &http.Request{
+		RemoteAddr: "10.1.2.3:1234",
+		Header:     http.Header{"X-Forwarded-For": []string{"1.1.1.1, 10.9.9.9"}},
+	}
+	if got := ps.ClientIP(r); got != "1.1.1.1" {
+		t.Fatalf("got %q", got)
+	}
+	// 非代理来源忽略头
+	r2 := &http.Request{
+		RemoteAddr: "8.8.8.8:9",
+		Header:     http.Header{"X-Forwarded-For": []string{"1.1.1.1"}},
+	}
+	if got := ps.ClientIP(r2); got != "8.8.8.8" {
+		t.Fatalf("got %q", got)
+	}
+}
+
+func TestFirstByteTimeout(t *testing.T) {
+	c1, c2 := net.Pipe()
+	defer func() { _ = c1.Close() }()
+	defer func() { _ = c2.Close() }()
+	done := make(chan error, 1)
+	go func() {
+		_, _, err := peekFirstByte(c2)
+		done <- err
+	}()
+	select {
+	case err := <-done:
+		if err == nil {
+			t.Fatal("expected timeout error")
+		}
+	case <-time.After(12 * time.Second):
+		t.Fatal("peek did not time out")
+	}
+}
+
+func writeTestCert(t *testing.T, dir, cn string) (certPath, keyPath string) {
+	t.Helper()
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	tmpl := &x509.Certificate{
+		SerialNumber: big.NewInt(time.Now().UnixNano()),
+		Subject:      pkix.Name{CommonName: cn},
+		NotBefore:    time.Now().Add(-time.Hour),
+		NotAfter:     time.Now().Add(24 * time.Hour),
+		KeyUsage:     x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
+		ExtKeyUsage:  []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		DNSNames:     []string{"localhost"},
+		IPAddresses:  []net.IP{net.ParseIP("127.0.0.1")},
+	}
+	der, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, &key.PublicKey, key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	certPath = filepath.Join(dir, cn+".crt")
+	keyPath = filepath.Join(dir, cn+".key")
+	certOut, err := os.Create(certPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: der})
+	_ = certOut.Close()
+	keyOut, err := os.Create(keyPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, err := x509.MarshalECPrivateKey(key)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = pem.Encode(keyOut, &pem.Block{Type: "EC PRIVATE KEY", Bytes: b})
+	_ = keyOut.Close()
+	return certPath, keyPath
+}

internal/listener/proxy.go

@@ -0,0 +1,101 @@
+package listener
+
+import (
+	"net"
+	"net/http"
+	"strings"
+)
+
+// ProxySet 保存受信任代理地址段。
+type ProxySet struct {
+	nets []*net.IPNet
+}
+
+// ParseTrustedProxies 解析 CIDR 或单 IP 列表。
+func ParseTrustedProxies(cidrs []string) (*ProxySet, error) {
+	ps := &ProxySet{}
+	for _, s := range cidrs {
+		s = strings.TrimSpace(s)
+		if s == "" {
+			continue
+		}
+		if !strings.Contains(s, "/") {
+			ip := net.ParseIP(s)
+			if ip == nil {
+				continue
+			}
+			if ip.To4() != nil {
+				s += "/32"
+			} else {
+				s += "/128"
+			}
+		}
+		_, n, err := net.ParseCIDR(s)
+		if err != nil {
+			return nil, err
+		}
+		ps.nets = append(ps.nets, n)
+	}
+	return ps, nil
+}
+
+// Contains 判断 IP 是否在受信任段内。
+func (ps *ProxySet) Contains(ip net.IP) bool {
+	if ps == nil || ip == nil {
+		return false
+	}
+	for _, n := range ps.nets {
+		if n.Contains(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// ClientIP 按 DEVELOPMENT 4.5：来自受信任代理时，取 X-Forwarded-For 从右往左第一个不在段内的 IP。
+// 非代理来源忽略转发头，返回 RemoteAddr 的 IP。
+func (ps *ProxySet) ClientIP(r *http.Request) string {
+	remoteIP := ipFromAddr(r.RemoteAddr)
+	if ps == nil || remoteIP == nil || !ps.Contains(remoteIP) {
+		if remoteIP != nil {
+			return remoteIP.String()
+		}
+		return ""
+	}
+	xff := r.Header.Get("X-Forwarded-For")
+	if xff == "" {
+		return remoteIP.String()
+	}
+	parts := strings.Split(xff, ",")
+	for i := len(parts) - 1; i >= 0; i-- {
+		ipStr := strings.TrimSpace(parts[i])
+		ip := net.ParseIP(ipStr)
+		if ip == nil {
+			continue
+		}
+		if !ps.Contains(ip) {
+			return ip.String()
+		}
+	}
+	return remoteIP.String()
+}
+
+// IsHTTPS 来自受信任代理时按 X-Forwarded-Proto 判断。
+func (ps *ProxySet) IsHTTPS(r *http.Request) bool {
+	if r.TLS != nil {
+		return true
+	}
+	remoteIP := ipFromAddr(r.RemoteAddr)
+	if ps == nil || remoteIP == nil || !ps.Contains(remoteIP) {
+		return false
+	}
+	return strings.EqualFold(r.Header.Get("X-Forwarded-Proto"), "https")
+}
+
+func ipFromAddr(remoteAddr string) net.IP {
+	host, _, err := net.SplitHostPort(remoteAddr)
+	if err != nil {
+		return net.ParseIP(remoteAddr)
+	}
+	return net.ParseIP(host)
+}

internal/listener/routes.go

@@ -0,0 +1,124 @@
+package listener
+
+import (
+	"net/http"
+	"strings"
+)
+
+// RouteRole 区分监听用途，决定哪些路径可用。
+type RouteRole int
+
+const (
+	// RoleShared listen 与 admin 共用同一端口。
+	RoleShared RouteRole = iota
+	// RoleClient 仅端接入（admin_listen 已分离）。
+	RoleClient
+	// RoleAdmin 仅后台。
+	RoleAdmin
+)
+
+// Handlers 由上层注入各路径处理函数；未设置的路径返回 404。
+type Handlers struct {
+	MQTT      http.Handler // /mqtt
+	ClientAPI http.Handler // /api/client/
+	AdminAPI  http.Handler // /api/admin/
+	Metrics   http.Handler // /metrics
+	Static    http.Handler // 后台静态页
+	Healthz   http.Handler // /healthz
+	Readyz    http.Handler // /readyz
+	// MetricsToken 共用端口时校验 Authorization: Bearer；空则 /metrics 404。
+	MetricsToken string
+}
+
+// NewMux 按角色装配 HTTP 路由骨架。
+func NewMux(role RouteRole, h Handlers) http.Handler {
+	mux := http.NewServeMux()
+
+	healthz := h.Healthz
+	if healthz == nil {
+		healthz = http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("ok"))
+		})
+	}
+	readyz := h.Readyz
+	if readyz == nil {
+		readyz = http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+			w.WriteHeader(http.StatusOK)
+			_, _ = w.Write([]byte("ok"))
+		})
+	}
+
+	mux.Handle("GET /healthz", healthz)
+	mux.Handle("GET /readyz", readyz)
+
+	switch role {
+	case RoleClient:
+		if h.MQTT != nil {
+			mux.Handle("/mqtt", h.MQTT)
+		}
+		if h.ClientAPI != nil {
+			mux.Handle("/api/client/", h.ClientAPI)
+		}
+		// 后台路径在端端口一律 404
+		mux.Handle("/api/admin/", http.NotFoundHandler())
+		mux.Handle("/metrics", http.NotFoundHandler())
+		mux.Handle("/", http.NotFoundHandler())
+
+	case RoleAdmin:
+		if h.AdminAPI != nil {
+			mux.Handle("/api/admin/", h.AdminAPI)
+		}
+		if h.Metrics != nil {
+			mux.Handle("GET /metrics", h.Metrics)
+		} else {
+			mux.Handle("GET /metrics", http.NotFoundHandler())
+		}
+		mux.Handle("/mqtt", http.NotFoundHandler())
+		mux.Handle("/api/client/", http.NotFoundHandler())
+		if h.Static != nil {
+			mux.Handle("/", h.Static)
+		} else {
+			mux.Handle("/", http.NotFoundHandler())
+		}
+
+	default: // RoleShared
+		if h.MQTT != nil {
+			mux.Handle("/mqtt", h.MQTT)
+		}
+		if h.ClientAPI != nil {
+			mux.Handle("/api/client/", h.ClientAPI)
+		}
+		if h.AdminAPI != nil {
+			mux.Handle("/api/admin/", h.AdminAPI)
+		}
+		mux.Handle("GET /metrics", metricsGate(h.MetricsToken, h.Metrics))
+		if h.Static != nil {
+			mux.Handle("/", h.Static)
+		} else {
+			mux.Handle("/", http.NotFoundHandler())
+		}
+	}
+
+	return mux
+}
+
+func metricsGate(token string, next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if token == "" {
+			http.NotFound(w, r)
+			return
+		}
+		auth := r.Header.Get("Authorization")
+		const prefix = "Bearer "
+		if !strings.HasPrefix(auth, prefix) || auth[len(prefix):] != token {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+		if next == nil {
+			http.NotFound(w, r)
+			return
+		}
+		next.ServeHTTP(w, r)
+	})
+}

internal/listener/server.go

@@ -0,0 +1,338 @@
+package listener
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Kind 识别结果。
+type Kind int
+
+const (
+	KindHTTP Kind = iota
+	KindMQTT
+	KindClosed
+)
+
+// Options 控制双端口识别与分流。
+type Options struct {
+	Listen         string
+	AdminListen    string
+	DataDir        string
+	CertFile       string
+	KeyFile        string
+	AllowPlaintext bool
+	TrustedProxies []string
+	// ClientHandler / AdminHandler 分别为端端口与后台端口的 HTTP 处理；AdminListen 为空时只用 ClientHandler。
+	ClientHandler http.Handler
+	AdminHandler  http.Handler
+	// OnMQTT 在 listen 上识别到裸 MQTT（含 TLS 后）时调用；应阻塞到连接结束。
+	OnMQTT func(conn net.Conn)
+	Logger *slog.Logger
+}
+
+// Server 一个或两个 TCP 监听上的协议识别与分流。
+type Server struct {
+	opts    Options
+	log     *slog.Logger
+	proxies *ProxySet
+	certs   *CertReloader
+
+	clientHTTP *ChanListener
+	adminHTTP  *ChanListener
+	clientSrv  *http.Server
+	adminSrv   *http.Server
+
+	clientLn net.Listener
+	adminLn  net.Listener
+
+	listenAddr      string
+	adminAddr       string
+	writeListenAddr bool
+	writeAdminAddr  bool
+
+	wg        sync.WaitGroup
+	closed    chan struct{}
+	closeOnce sync.Once
+}
+
+// New 校验选项并准备证书；不开始监听。
+func New(opts Options) (*Server, error) {
+	if opts.Listen == "" {
+		return nil, errors.New("listener: listen is required")
+	}
+	if opts.ClientHandler == nil {
+		return nil, errors.New("listener: ClientHandler is required")
+	}
+	log := opts.Logger
+	if log == nil {
+		log = slog.Default()
+	}
+	ps, err := ParseTrustedProxies(opts.TrustedProxies)
+	if err != nil {
+		return nil, fmt.Errorf("trusted_proxies: %w", err)
+	}
+	s := &Server{
+		opts:    opts,
+		log:     log,
+		proxies: ps,
+		closed:  make(chan struct{}),
+	}
+	hasCert := opts.CertFile != "" && opts.KeyFile != ""
+	if hasCert {
+		cr, err := NewCertReloader(opts.CertFile, opts.KeyFile, log)
+		if err != nil {
+			return nil, fmt.Errorf("tls: %w", err)
+		}
+		s.certs = cr
+	} else {
+		log.Warn("tls not configured; plaintext only")
+	}
+	s.writeListenAddr = isPortZero(opts.Listen)
+	s.writeAdminAddr = opts.AdminListen != "" && isPortZero(opts.AdminListen)
+	return s, nil
+}
+
+// Start 开始监听并分流；非阻塞，关闭用 Close。
+func (s *Server) Start(ctx context.Context) error {
+	ln, err := net.Listen("tcp", s.opts.Listen)
+	if err != nil {
+		return fmt.Errorf("listen %s: %w", s.opts.Listen, err)
+	}
+	s.clientLn = ln
+	s.listenAddr = ln.Addr().String()
+	if s.writeListenAddr {
+		if err := writeAddrFile(s.opts.DataDir, "listen.addr", s.listenAddr); err != nil {
+			_ = ln.Close()
+			return err
+		}
+	}
+
+	s.clientHTTP = NewChanListener(ln.Addr(), 128)
+	s.clientSrv = &http.Server{
+		Handler:           s.opts.ClientHandler,
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+	s.wg.Add(1)
+	go func() {
+		defer s.wg.Done()
+		err := s.clientSrv.Serve(s.clientHTTP)
+		if err != nil && !errors.Is(err, http.ErrServerClosed) {
+			s.log.Error("client http serve", "err", err)
+		}
+	}()
+	s.wg.Add(1)
+	go s.acceptLoop(ln, false)
+
+	if s.opts.AdminListen != "" {
+		aln, err := net.Listen("tcp", s.opts.AdminListen)
+		if err != nil {
+			_ = s.Close()
+			return fmt.Errorf("admin_listen %s: %w", s.opts.AdminListen, err)
+		}
+		s.adminLn = aln
+		s.adminAddr = aln.Addr().String()
+		if s.writeAdminAddr {
+			if err := writeAddrFile(s.opts.DataDir, "admin.addr", s.adminAddr); err != nil {
+				_ = s.Close()
+				return err
+			}
+		}
+		adminHandler := s.opts.AdminHandler
+		if adminHandler == nil {
+			adminHandler = http.NotFoundHandler()
+		}
+		s.adminHTTP = NewChanListener(aln.Addr(), 64)
+		s.adminSrv = &http.Server{
+			Handler:           adminHandler,
+			ReadHeaderTimeout: 10 * time.Second,
+		}
+		s.wg.Add(1)
+		go func() {
+			defer s.wg.Done()
+			err := s.adminSrv.Serve(s.adminHTTP)
+			if err != nil && !errors.Is(err, http.ErrServerClosed) {
+				s.log.Error("admin http serve", "err", err)
+			}
+		}()
+		s.wg.Add(1)
+		go s.acceptLoop(aln, true)
+	}
+
+	go func() {
+		<-ctx.Done()
+		_ = s.Close()
+	}()
+	return nil
+}
+
+// ListenAddr 返回端监听实际地址。
+func (s *Server) ListenAddr() string { return s.listenAddr }
+
+// AdminAddr 返回后台监听实际地址（未分离时为空）。
+func (s *Server) AdminAddr() string { return s.adminAddr }
+
+// Proxies 返回受信任代理集合。
+func (s *Server) Proxies() *ProxySet { return s.proxies }
+
+// TLSConfig 返回当前 TLS 配置（未配置证书时为 nil）。
+func (s *Server) TLSConfig() *tls.Config {
+	if s.certs == nil {
+		return nil
+	}
+	return s.certs.TLSConfig()
+}
+
+// Close 停止接受并关闭 HTTP。
+func (s *Server) Close() error {
+	var first error
+	s.closeOnce.Do(func() {
+		close(s.closed)
+		if s.clientLn != nil {
+			_ = s.clientLn.Close()
+		}
+		if s.adminLn != nil {
+			_ = s.adminLn.Close()
+		}
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if s.clientSrv != nil {
+			if err := s.clientSrv.Shutdown(shutdownCtx); err != nil && first == nil {
+				first = err
+			}
+		}
+		if s.adminSrv != nil {
+			if err := s.adminSrv.Shutdown(shutdownCtx); err != nil && first == nil {
+				first = err
+			}
+		}
+		if s.clientHTTP != nil {
+			_ = s.clientHTTP.Close()
+		}
+		if s.adminHTTP != nil {
+			_ = s.adminHTTP.Close()
+		}
+		if s.certs != nil {
+			s.certs.Close()
+		}
+	})
+	s.wg.Wait()
+	return first
+}
+
+func (s *Server) acceptLoop(ln net.Listener, isAdmin bool) {
+	defer s.wg.Done()
+	for {
+		c, err := ln.Accept()
+		if err != nil {
+			select {
+			case <-s.closed:
+				return
+			default:
+				return
+			}
+		}
+		s.wg.Add(1)
+		go func(conn net.Conn) {
+			defer s.wg.Done()
+			s.handleConn(conn, isAdmin)
+		}(c)
+	}
+}
+
+func (s *Server) handleConn(conn net.Conn, isAdmin bool) {
+	kind, out, err := s.classify(conn, isAdmin, false)
+	if err != nil || kind == KindClosed {
+		_ = conn.Close()
+		return
+	}
+	switch kind {
+	case KindHTTP:
+		httpLn := s.clientHTTP
+		if isAdmin {
+			httpLn = s.adminHTTP
+		}
+		if httpLn == nil {
+			_ = out.Close()
+			return
+		}
+		httpLn.Enqueue(out)
+	case KindMQTT:
+		if s.opts.OnMQTT != nil {
+			s.opts.OnMQTT(out)
+		} else {
+			_ = out.Close()
+		}
+	default:
+		_ = out.Close()
+	}
+}
+
+// classify 读首字节分流；afterTLS 表示已在 TLS 内层再识别。
+func (s *Server) classify(conn net.Conn, isAdmin, afterTLS bool) (Kind, net.Conn, error) {
+	c, b, err := peekFirstByte(conn)
+	if err != nil {
+		return KindClosed, nil, err
+	}
+
+	hasCert := s.certs != nil
+	allowPlain := s.opts.AllowPlaintext || !hasCert
+
+	if b == 0x16 {
+		if !hasCert {
+			return KindClosed, nil, errors.New("tls client hello but no certificate")
+		}
+		if afterTLS {
+			return KindClosed, nil, errors.New("nested tls")
+		}
+		tlsConn := tls.Server(c, s.certs.TLSConfig())
+		if err := tlsConn.Handshake(); err != nil {
+			return KindClosed, nil, err
+		}
+		return s.classify(tlsConn, isAdmin, true)
+	}
+
+	if !allowPlain && !afterTLS {
+		// 配了证书且未允许明文：非 TLS 首字节直接关
+		return KindClosed, nil, errors.New("plaintext not allowed")
+	}
+
+	if b >= 'A' && b <= 'Z' {
+		return KindHTTP, c, nil
+	}
+	if b == 0x10 {
+		if isAdmin {
+			return KindClosed, nil, errors.New("mqtt not allowed on admin_listen")
+		}
+		return KindMQTT, c, nil
+	}
+	return KindClosed, nil, errors.New("unknown first byte")
+}
+
+func writeAddrFile(dataDir, name, addr string) error {
+	if dataDir == "" {
+		return errors.New("data_dir required to write addr file")
+	}
+	if err := os.MkdirAll(dataDir, 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(filepath.Join(dataDir, name), []byte(addr+"\n"), 0o644)
+}
+
+func isPortZero(addr string) bool {
+	_, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		return strings.HasSuffix(addr, ":0") || addr == ":0"
+	}
+	return port == "0"
+}

internal/listener/tls.go

@@ -0,0 +1,117 @@
+package listener
+
+import (
+	"crypto/tls"
+	"log/slog"
+	"os"
+	"sync"
+	"time"
+)
+
+// CertReloader 按文件修改时间每小时重载证书；失败继续用旧证书。
+type CertReloader struct {
+	certFile string
+	keyFile  string
+	log      *slog.Logger
+
+	mu       sync.RWMutex
+	cert     *tls.Certificate
+	certMod  time.Time
+	keyMod   time.Time
+	stop     chan struct{}
+	stopOnce sync.Once
+}
+
+// NewCertReloader 立即加载一次证书。
+func NewCertReloader(certFile, keyFile string, log *slog.Logger) (*CertReloader, error) {
+	if log == nil {
+		log = slog.Default()
+	}
+	r := &CertReloader{
+		certFile: certFile,
+		keyFile:  keyFile,
+		log:      log,
+		stop:     make(chan struct{}),
+	}
+	if err := r.reload(true); err != nil {
+		return nil, err
+	}
+	go r.loop()
+	return r, nil
+}
+
+// GetCertificate 供 tls.Config.GetCertificate 使用。
+func (r *CertReloader) GetCertificate(*tls.ClientHelloInfo) (*tls.Certificate, error) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	return r.cert, nil
+}
+
+// Certificate 返回当前证书（测试用）。
+func (r *CertReloader) Certificate() *tls.Certificate {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	return r.cert
+}
+
+// Close 停止重载循环。
+func (r *CertReloader) Close() {
+	r.stopOnce.Do(func() { close(r.stop) })
+}
+
+func (r *CertReloader) loop() {
+	t := time.NewTicker(time.Hour)
+	defer t.Stop()
+	for {
+		select {
+		case <-r.stop:
+			return
+		case <-t.C:
+			if err := r.reload(false); err != nil {
+				r.log.Error("tls cert reload failed, keeping old cert", "err", err)
+			}
+		}
+	}
+}
+
+// ReloadNow 立即按 mtime 检查并重载（测试用）。
+func (r *CertReloader) ReloadNow() error {
+	return r.reload(false)
+}
+
+func (r *CertReloader) reload(force bool) error {
+	certInfo, err := os.Stat(r.certFile)
+	if err != nil {
+		return err
+	}
+	keyInfo, err := os.Stat(r.keyFile)
+	if err != nil {
+		return err
+	}
+	r.mu.RLock()
+	same := !force && certInfo.ModTime().Equal(r.certMod) && keyInfo.ModTime().Equal(r.keyMod) && r.cert != nil
+	r.mu.RUnlock()
+	if same {
+		return nil
+	}
+	cert, err := tls.LoadX509KeyPair(r.certFile, r.keyFile)
+	if err != nil {
+		return err
+	}
+	r.mu.Lock()
+	r.cert = &cert
+	r.certMod = certInfo.ModTime()
+	r.keyMod = keyInfo.ModTime()
+	r.mu.Unlock()
+	r.log.Info("tls certificate loaded", "cert", r.certFile)
+	return nil
+}
+
+// TLSConfig 构造不设 NextProtos 的服务端 TLS 配置。
+func (r *CertReloader) TLSConfig() *tls.Config {
+	return &tls.Config{
+		GetCertificate: r.GetCertificate,
+		MinVersion:     tls.VersionTLS12,
+		// 故意不设 NextProtos，以便声明 ALPN mqtt 的客户端仍能握手。
+	}
+}

internal/metrics/metrics.go

@@ -0,0 +1,115 @@
+package metrics
+
+import (
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// Registry 持有 NixMsg 指标与独立注册表（避免污染默认全局注册表）。
+type Registry struct {
+	reg *prometheus.Registry
+
+	Connections           *prometheus.GaugeVec
+	EndpointsTotal        prometheus.Gauge
+	DeliveriesPending     prometheus.Gauge
+	MessagesScheduled     prometheus.Gauge
+	DispatchToPushSeconds prometheus.Observer
+	AckSeconds            prometheus.Observer
+	WriteQueueLength      prometheus.Gauge
+	WriteCommitSeconds    prometheus.Observer
+	PasswordHashQueue     prometheus.Gauge
+	ErrorsTotal           *prometheus.CounterVec
+}
+
+// New 按 DEVELOPMENT 4.3 注册指标。
+func New() *Registry {
+	reg := prometheus.NewRegistry()
+	r := &Registry{reg: reg}
+
+	r.Connections = prometheus.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "nixmsg_connections",
+		Help: "Current online connections by transport (ws or tcp).",
+	}, []string{"transport"})
+
+	r.EndpointsTotal = prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "nixmsg_endpoints",
+		Help: "Total number of endpoints.",
+	})
+
+	r.DeliveriesPending = prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "nixmsg_deliveries_pending",
+		Help: "Number of pending deliveries.",
+	})
+
+	r.MessagesScheduled = prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "nixmsg_messages_scheduled",
+		Help: "Number of scheduled messages not yet dispatched.",
+	})
+
+	dispatchHist := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Name:    "nixmsg_dispatch_to_push_duration_seconds",
+		Help:    "Latency from message due time to push.",
+		Buckets: prometheus.DefBuckets,
+	})
+	r.DispatchToPushSeconds = dispatchHist
+
+	ackHist := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Name:    "nixmsg_ack_duration_seconds",
+		Help:    "Latency from push to ack.",
+		Buckets: prometheus.DefBuckets,
+	})
+	r.AckSeconds = ackHist
+
+	r.WriteQueueLength = prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "nixmsg_write_queue_length",
+		Help: "Number of write operations waiting or in the current batch.",
+	})
+
+	commitHist := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Name:    "nixmsg_write_batch_commit_duration_seconds",
+		Help:    "Duration of each merged write-queue commit.",
+		Buckets: prometheus.DefBuckets,
+	})
+	r.WriteCommitSeconds = commitHist
+
+	r.PasswordHashQueue = prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "nixmsg_password_hash_queue_length",
+		Help: "Number of password hash jobs waiting for a pool slot.",
+	})
+
+	r.ErrorsTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Name: "nixmsg_errors_total",
+		Help: "Count of application error codes.",
+	}, []string{"code"})
+
+	reg.MustRegister(
+		r.Connections,
+		r.EndpointsTotal,
+		r.DeliveriesPending,
+		r.MessagesScheduled,
+		dispatchHist,
+		ackHist,
+		r.WriteQueueLength,
+		commitHist,
+		r.PasswordHashQueue,
+		r.ErrorsTotal,
+	)
+
+	// 初始化 transport 标签，便于空载抓取也能看到序列。
+	r.Connections.WithLabelValues("ws").Set(0)
+	r.Connections.WithLabelValues("tcp").Set(0)
+
+	return r
+}
+
+// Handler 返回 Prometheus 文本格式的 /metrics 处理函数（访问规则由 A 线加）。
+func (r *Registry) Handler() http.Handler {
+	return promhttp.HandlerFor(r.reg, promhttp.HandlerOpts{})
+}
+
+// Gatherer 暴露底层 Gatherer（测试用）。
+func (r *Registry) Gatherer() prometheus.Gatherer {
+	return r.reg
+}

internal/metrics/metrics_test.go

@@ -0,0 +1,58 @@
+package metrics
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestMetricsHandlerExposesText(t *testing.T) {
+	t.Parallel()
+	m := New()
+	m.Connections.WithLabelValues("ws").Set(3)
+	m.Connections.WithLabelValues("tcp").Set(2)
+	m.EndpointsTotal.Set(10)
+	m.DeliveriesPending.Set(4)
+	m.MessagesScheduled.Set(1)
+	m.DispatchToPushSeconds.Observe(0.05)
+	m.AckSeconds.Observe(0.02)
+	m.WriteQueueLength.Set(7)
+	m.WriteCommitSeconds.Observe(0.001)
+	m.PasswordHashQueue.Set(2)
+	m.ErrorsTotal.WithLabelValues("busy").Inc()
+
+	req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
+	rec := httptest.NewRecorder()
+	m.Handler().ServeHTTP(rec, req)
+	resp := rec.Result()
+	defer func() { _ = resp.Body.Close() }()
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("status=%d", resp.StatusCode)
+	}
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	text := string(body)
+	for _, want := range []string{
+		"nixmsg_connections",
+		`transport="ws"`,
+		`transport="tcp"`,
+		"nixmsg_endpoints",
+		"nixmsg_deliveries_pending",
+		"nixmsg_messages_scheduled",
+		"nixmsg_dispatch_to_push_duration_seconds",
+		"nixmsg_ack_duration_seconds",
+		"nixmsg_write_queue_length",
+		"nixmsg_write_batch_commit_duration_seconds",
+		"nixmsg_password_hash_queue_length",
+		"nixmsg_errors_total",
+		`code="busy"`,
+	} {
+		if !strings.Contains(text, want) {
+			t.Fatalf("metrics text missing %q\n%s", want, text)
+		}
+	}
+}

internal/store/admin.go

@@ -0,0 +1,47 @@
+package store
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+	"time"
+)
+
+const settingAdminPasswordHash = "admin_password_hash"
+
+// HasAdminPassword 检查 settings 中是否已有管理员密码哈希。
+func HasAdminPassword(ctx context.Context, db *sql.DB) (bool, error) {
+	var value string
+	err := db.QueryRowContext(ctx, `SELECT value FROM settings WHERE key = ?`, settingAdminPasswordHash).Scan(&value)
+	if err == sql.ErrNoRows {
+		return false, nil
+	}
+	if err != nil {
+		return false, err
+	}
+	return value != "", nil
+}
+
+// SetAdminPasswordHash 写入或覆盖管理员密码哈希。
+func SetAdminPasswordHash(ctx context.Context, db *sql.DB, phc string) error {
+	now := time.Now().UnixMilli()
+	_, err := db.ExecContext(ctx, `
+INSERT INTO settings(key, value, updated_at) VALUES(?, ?, ?)
+ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = excluded.updated_at
+`, settingAdminPasswordHash, phc, now)
+	return err
+}
+
+// VacuumInto 对打开的写连接执行 VACUUM INTO（可用于运行中备份）。
+func VacuumInto(ctx context.Context, db *sql.DB, outPath string) error {
+	if outPath == "" {
+		return fmt.Errorf("store: vacuum into path empty")
+	}
+	escaped := strings.ReplaceAll(outPath, "'", "''")
+	_, err := db.ExecContext(ctx, "VACUUM INTO '"+escaped+"'")
+	if err != nil {
+		return fmt.Errorf("vacuum into: %w", err)
+	}
+	return nil
+}

internal/store/queue.go

@@ -4,29 +4,57 @@ import (
 	"context"
 	"database/sql"
 	"errors"
+	"fmt"
 	"sync"
+	"sync/atomic"
+	"time"
 )
 
 // ErrQueueClosed 表示写入队列已关闭。
 var ErrQueueClosed = errors.New("store: write queue closed")
 
+// ErrBusy 表示写库基础设施失败（可映射为协议 busy；/readyz 应失败）。
+var ErrBusy = errors.New("store: busy")
+
+const (
+	maxBatchOps   = 256
+	batchWait     = 2 * time.Millisecond
+	queueBuffSize = 1024
+)
+
 // WriteFunc 在单个写事务中执行的操作。
 type WriteFunc func(tx *sql.Tx) error
 
-// Queue 写入队列：提交一个写操作并拿到结果。
+type writeJob struct {
-//
+	ctx context.Context
-// 本任务（T0.3）实现为互斥串行的一操作一事务，不做合并；DEVELOPMENT 7.2
+	fn  WriteFunc
-// 要求的写 goroutine 合并提交（最多 256 个或凑满 2ms、SAVEPOINT 隔离失败）留给 P2。
+	res chan error
+}
+
+// Queue 写入队列：写 goroutine 合并提交（最多 256 个或凑满 2ms），每操作用 SAVEPOINT 隔离。
 type Queue struct {
 	db *sql.DB
 
+	ch     chan writeJob
+	done   chan struct{}
+	closed atomic.Bool
+
 	mu           sync.Mutex
-	closed bool
+	ready        bool
+	lastWriteErr error
+	pending      int
 }
 
-// NewQueue 创建简单写入队列（一操作一事务）。
+// NewQueue 创建合并写入队列并启动写 goroutine。
 func NewQueue(db *sql.DB) *Queue {
-	return &Queue{db: db}
+	q := &Queue{
+		db:    db,
+		ch:    make(chan writeJob, queueBuffSize),
+		done:  make(chan struct{}),
+		ready: true,
+	}
+	go q.loop()
+	return q
 }
 
 // Do 提交写操作并等待提交结果。
@@ -34,29 +62,235 @@ func (q *Queue) Do(ctx context.Context, fn WriteFunc) error {
 	if fn == nil {
 		return errors.New("store: nil write func")
 	}
-	q.mu.Lock()
+	if q.closed.Load() {
-	defer q.mu.Unlock()
-	if q.closed {
 		return ErrQueueClosed
 	}
 	if err := ctx.Err(); err != nil {
 		return err
 	}
-	tx, err := q.db.BeginTx(ctx, nil)
+	job := writeJob{ctx: ctx, fn: fn, res: make(chan error, 1)}
+	q.mu.Lock()
+	q.pending++
+	q.mu.Unlock()
+	select {
+	case q.ch <- job:
+	case <-ctx.Done():
+		q.mu.Lock()
+		q.pending--
+		q.mu.Unlock()
+		return ctx.Err()
+	case <-q.done:
+		q.mu.Lock()
+		q.pending--
+		q.mu.Unlock()
+		return ErrQueueClosed
+	}
+	select {
+	case err := <-job.res:
+		return err
+	case <-ctx.Done():
+		// 操作可能仍在队列中执行；结果通道仍会被写端关闭式填入。
+		select {
+		case err := <-job.res:
 			if err != nil {
 				return err
 			}
-	if err := fn(tx); err != nil {
+			return ctx.Err()
-		_ = tx.Rollback()
+		case <-time.After(30 * time.Second):
-		return err
+			return ctx.Err()
+		}
 	}
-	return tx.Commit()
 }
 
-// Close 关闭队列，之后 Do 返回 ErrQueueClosed。
+func (q *Queue) loop() {
-func (q *Queue) Close() error {
+	defer close(q.done)
+	for {
+		job, ok := <-q.ch
+		if !ok {
+			return
+		}
+		batch := []writeJob{job}
+		timer := time.NewTimer(batchWait)
+	collect:
+		for len(batch) < maxBatchOps {
+			select {
+			case j, ok := <-q.ch:
+				if !ok {
+					break collect
+				}
+				batch = append(batch, j)
+			case <-timer.C:
+				break collect
+			}
+		}
+		timer.Stop()
+		q.runBatch(batch)
+	}
+}
+
+func (q *Queue) runBatch(batch []writeJob) {
+	defer func() {
+		q.mu.Lock()
+		q.pending -= len(batch)
+		if q.pending < 0 {
+			q.pending = 0
+		}
+		q.mu.Unlock()
+	}()
+
+	// 过滤已取消的任务。
+	active := make([]writeJob, 0, len(batch))
+	for _, j := range batch {
+		if err := j.ctx.Err(); err != nil {
+			j.res <- err
+			continue
+		}
+		active = append(active, j)
+	}
+	if len(active) == 0 {
+		return
+	}
+
+	tx, err := q.db.BeginTx(context.Background(), nil)
+	if err != nil {
+		q.markBusy(err)
+		for _, j := range active {
+			j.res <- errors.Join(ErrBusy, err)
+		}
+		return
+	}
+
+	type outcome struct {
+		job     writeJob
+		opErr   error
+		success bool
+	}
+	outcomes := make([]outcome, 0, len(active))
+	for i, j := range active {
+		sp := fmt.Sprintf("sp_%d", i)
+		if _, err := tx.Exec("SAVEPOINT " + sp); err != nil {
+			_ = tx.Rollback()
+			q.markBusy(err)
+			for _, o := range outcomes {
+				if o.success {
+					o.job.res <- errors.Join(ErrBusy, err)
+				}
+			}
+			for _, rest := range active[i:] {
+				rest.res <- errors.Join(ErrBusy, err)
+			}
+			return
+		}
+		opErr := j.fn(tx)
+		if opErr != nil {
+			if _, rbErr := tx.Exec("ROLLBACK TO " + sp); rbErr != nil {
+				_ = tx.Rollback()
+				q.markBusy(rbErr)
+				for _, o := range outcomes {
+					if o.success {
+						o.job.res <- errors.Join(ErrBusy, rbErr)
+					}
+				}
+				j.res <- opErr
+				for _, rest := range active[i+1:] {
+					rest.res <- errors.Join(ErrBusy, rbErr)
+				}
+				return
+			}
+			_, _ = tx.Exec("RELEASE " + sp)
+			outcomes = append(outcomes, outcome{job: j, opErr: opErr, success: false})
+			continue
+		}
+		if _, err := tx.Exec("RELEASE " + sp); err != nil {
+			_ = tx.Rollback()
+			q.markBusy(err)
+			for _, o := range outcomes {
+				if o.success {
+					o.job.res <- errors.Join(ErrBusy, err)
+				}
+			}
+			j.res <- errors.Join(ErrBusy, err)
+			for _, rest := range active[i+1:] {
+				rest.res <- errors.Join(ErrBusy, err)
+			}
+			return
+		}
+		outcomes = append(outcomes, outcome{job: j, success: true})
+	}
+
+	if err := tx.Commit(); err != nil {
+		q.markBusy(err)
+		for _, o := range outcomes {
+			if o.success {
+				o.job.res <- errors.Join(ErrBusy, err)
+			} else {
+				o.job.res <- o.opErr
+			}
+		}
+		return
+	}
+	for _, o := range outcomes {
+		if o.success {
+			o.job.res <- nil
+		} else {
+			o.job.res <- o.opErr
+		}
+	}
+}
+
+func (q *Queue) markBusy(err error) {
 	q.mu.Lock()
 	defer q.mu.Unlock()
-	q.closed = true
+	q.ready = false
+	q.lastWriteErr = err
+}
+
+// IsReady 写库是否仍可用（写失败后为 false）。
+func (q *Queue) IsReady() bool {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+	return q.ready
+}
+
+// LastWriteError 返回最近一次基础设施写失败。
+func (q *Queue) LastWriteError() error {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+	return q.lastWriteErr
+}
+
+// Len 返回排队与批次中的写操作数。
+func (q *Queue) Len() int {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+	return q.pending
+}
+
+// Drain 等待已入队操作完成，或 ctx 取消。关闭后也会等到 loop 退出。
+func (q *Queue) Drain(ctx context.Context) error {
+	ticker := time.NewTicker(5 * time.Millisecond)
+	defer ticker.Stop()
+	for {
+		q.mu.Lock()
+		n := q.pending
+		q.mu.Unlock()
+		if n == 0 {
+			return nil
+		}
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-ticker.C:
+		}
+	}
+}
+
+// Close 关闭队列：不再接受新任务，并等待写 goroutine 处理完已入队任务后退出。
+func (q *Queue) Close() error {
+	if q.closed.Swap(true) {
+		return nil
+	}
+	close(q.ch)
+	<-q.done
 	return nil
 }

internal/store/queue_test.go

@@ -0,0 +1,175 @@
+package store
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestWriteQueueSavepointIsolatesFailure(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+	db, err := Open(dir, "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = db.Close() }()
+
+	ctx := context.Background()
+	var wg sync.WaitGroup
+	wg.Add(2)
+	errOK := make(chan error, 1)
+	errBad := make(chan error, 1)
+
+	go func() {
+		defer wg.Done()
+		errOK <- db.Queue.Do(ctx, func(tx *sql.Tx) error {
+			_, e := tx.Exec(
+				`INSERT INTO settings(key, value, updated_at) VALUES(?, ?, ?)`,
+				"k_ok", "1", time.Now().UnixMilli(),
+			)
+			return e
+		})
+	}()
+	go func() {
+		defer wg.Done()
+		// 稍等，尽量与成功操作进同一批。
+		time.Sleep(500 * time.Microsecond)
+		errBad <- db.Queue.Do(ctx, func(tx *sql.Tx) error {
+			return errors.New("forced op failure")
+		})
+	}()
+	wg.Wait()
+
+	if e := <-errOK; e != nil {
+		t.Fatalf("ok op: %v", e)
+	}
+	if e := <-errBad; e == nil || e.Error() != "forced op failure" {
+		t.Fatalf("bad op: %v", e)
+	}
+
+	var value string
+	if scanErr := db.Read.QueryRow(`SELECT value FROM settings WHERE key = ?`, "k_ok").Scan(&value); scanErr != nil {
+		t.Fatalf("ok row missing: %v", scanErr)
+	}
+	if value != "1" {
+		t.Fatalf("value=%q", value)
+	}
+	if !db.Queue.IsReady() {
+		t.Fatal("op failure should not mark queue busy")
+	}
+}
+
+func TestWriteQueueBatchCommit(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+	db, err := Open(dir, "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = db.Close() }()
+
+	ctx := context.Background()
+	const n = 32
+	var wg sync.WaitGroup
+	wg.Add(n)
+	errs := make([]error, n)
+	for i := 0; i < n; i++ {
+		i := i
+		go func() {
+			defer wg.Done()
+			key := fmt.Sprintf("batch_%d", i)
+			errs[i] = db.Queue.Do(ctx, func(tx *sql.Tx) error {
+				_, e := tx.Exec(
+					`INSERT INTO settings(key, value, updated_at) VALUES(?, ?, ?)`,
+					key, "1", time.Now().UnixMilli(),
+				)
+				return e
+			})
+		}()
+	}
+	wg.Wait()
+	for i, e := range errs {
+		if e != nil {
+			t.Fatalf("op %d: %v", i, e)
+		}
+	}
+	var count int
+	if err := db.Read.QueryRow(`SELECT COUNT(*) FROM settings WHERE key LIKE 'batch_%'`).Scan(&count); err != nil {
+		t.Fatal(err)
+	}
+	if count != n {
+		t.Fatalf("count=%d want %d", count, n)
+	}
+}
+
+func TestWriteQueueNoBacklogAt200PerSec(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+	db, err := Open(dir, "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = db.Close() }()
+
+	ctx := context.Background()
+	const total = 200
+	start := time.Now()
+	var wg sync.WaitGroup
+	wg.Add(total)
+	for i := 0; i < total; i++ {
+		i := i
+		go func() {
+			defer wg.Done()
+			key := fmt.Sprintf("load_%d", i)
+			if e := db.Queue.Do(ctx, func(tx *sql.Tx) error {
+				_, e := tx.Exec(
+					`INSERT INTO settings(key, value, updated_at) VALUES(?, ?, ?)`,
+					key, "1", time.Now().UnixMilli(),
+				)
+				return e
+			}); e != nil {
+				t.Errorf("op %d: %v", i, e)
+			}
+		}()
+	}
+	wg.Wait()
+	elapsed := time.Since(start)
+	if db.Queue.Len() != 0 {
+		t.Fatalf("queue backlog len=%d", db.Queue.Len())
+	}
+	// 200 条并发写入应在数秒内完成（合并提交）；过长则合并未生效。
+	if elapsed > 5*time.Second {
+		t.Fatalf("200 writes took %s, queue likely not merging well", elapsed)
+	}
+}
+
+func BenchmarkWriteQueue200PerSec(b *testing.B) {
+	dir := b.TempDir()
+	db, err := Open(dir, "FULL")
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer func() { _ = db.Close() }()
+
+	ctx := context.Background()
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		key := fmt.Sprintf("bench_%d", i)
+		if err := db.Queue.Do(ctx, func(tx *sql.Tx) error {
+			_, e := tx.Exec(
+				`INSERT INTO settings(key, value, updated_at) VALUES(?, ?, ?)
+ON CONFLICT(key) DO UPDATE SET value = excluded.value, updated_at = excluded.updated_at`,
+				key, "1", time.Now().UnixMilli(),
+			)
+			return e
+		}); err != nil {
+			b.Fatal(err)
+		}
+	}
+}

internal/store/ready.go

@@ -0,0 +1,26 @@
+package store
+
+import (
+	"context"
+	"errors"
+)
+
+// Ready 检查读写库可用且写入队列未因磁盘类失败进入 busy。
+func (d *DB) Ready(ctx context.Context) error {
+	if d == nil || d.Write == nil || d.Read == nil {
+		return errors.New("store: not open")
+	}
+	if err := d.Write.PingContext(ctx); err != nil {
+		return err
+	}
+	if err := d.Read.PingContext(ctx); err != nil {
+		return err
+	}
+	if d.Queue != nil && !d.Queue.IsReady() {
+		if err := d.Queue.LastWriteError(); err != nil {
+			return errors.Join(ErrBusy, err)
+		}
+		return ErrBusy
+	}
+	return nil
+}