fix: 建群事务内复核创建者避免停用竞态留下非法群主

docs/DEVIATIONS.md

@@ -1719,12 +1719,12 @@ issue #3 未关闭，`feat/fix-3-downlink-deadlock` 未合入 `main`。下面是
    - 备选方案：为每个未测子项补验收用例（本波不做，避免为变绿放松断言）。  
    - 影响：汇总改为通过 19、部分通过 4（F03/F08/F21/F22）、失败 0。F19 仍引用仓库内 SDK 清单、本波不重跑。
 
-### 复审修复 R3-06
+### 复审修复 R3-07
 
-1. **Python/Java 首次握手失败应停止重连；Java rate_limited 在途计数只减一次**  
+1. **客户端建群事务内复核创建者**  
    - 日期：2026-09-30  
-   - 原条款：DEVELOPMENT 第 9 节附录「首次连接超时或握手失败应停止重连，并向 connect() 返回未连接」；issue #70。  
+   - 原条款：Gitea #71。`group.Create` 在 `Queue.Do` 里直接 `insertMemberTx` 群主，不跑 `endpointCheckTx`；停用/删除与建群抢在事务外对话密码窗口时，可插入已停用甚至刚删除的 `owner_id`。  
-   - 实际做法：`sdk/python` 的 `connect()` 在 `_handshake_error` 或非 ONLINE 终态时置 `_stop_reconnect`/`_want_connected=False`；内部连接/握手超时改用 `not_connected`（不再用 `busy`）。`sdk/java` 的 `connectSync` 在 `handshakeError` 时同样置 `stopReconnect`；`rate_limited` 路径去掉第二次 `inflightSends--`，只换新 rid 再排队。Python `transport.py` 将 paho 改为惰性导入，便于本机无 paho 时仍跑 FakeTransport 单测。不改 Go/JS 重连公式。  
+   - 实际做法：`Create` 同一写事务里，插入群与群主成员之前对 `actorID` 做与 `createAdmin` 相同的 `endpointCheckTx`；已停用 `endpoint_disabled`，不存在 `invalid_target`，且不插入群。不改 `emit`、不改迁移编号。  
-   - 原因：原先抛错后工作线程仍按退避重连；Java 限速把在途计数减了两次。  
+   - 原因：成员侧已有事务内复核，群主侧缺对称校验，竞态会留下非法群主。  
-   - 备选方案：在后台 `_attempt_connect`/`attemptConnect` 内首次失败即停（否决：应用再次 `connect()` 才应恢复，标志应在对外 `connect` 失败路径统一置位）。  
+   - 备选方案：事务外再查一次创建者（否决，无法覆盖密码窗口与写事务之间的竞态）。  
-   - 影响：仅 `sdk/python`、`sdk/java`；应用需再次调用 `connect()` 才会重连。
+   - 影响：创建者在进入写事务前被停用/删除时建群失败且无新群行；与后台建群错误码对齐。

internal/app/group/app.go

@@ -147,6 +147,15 @@ func (a *App) Create(ctx context.Context, actorID string, req *protocol.GroupCre
 
 	var inserted []string
 	err := a.db.Queue.Do(ctx, func(tx *sql.Tx) error {
+		if e := endpointCheckTx(tx, actorID); e != nil {
+			if protoCode(e) == protocol.CodeInvalidTarget {
+				return errCode(protocol.CodeInvalidTarget, "owner not found")
+			}
+			if protoCode(e) == protocol.CodeEndpointDisabled {
+				return errCode(protocol.CodeEndpointDisabled, "owner disabled")
+			}
+			return e
+		}
 		var exists int
 		qErr := tx.QueryRow(`SELECT 1 FROM groups WHERE id = ?`, gid).Scan(&exists)
 		if qErr == nil {

internal/app/group/group_test.go

@@ -604,6 +604,106 @@ func TestU02CreateDedupesMembers(t *testing.T) {
 	}
 }
 
+// raceTalk 在对话密码校验成功后执行一次 mutate，模拟事务外密码窗口里创建者被停用/删除。
+type raceTalk struct {
+	inner  group.TalkGate
+	mutate func()
+	once   sync.Once
+}
+
+func (r *raceTalk) CheckTalkPasswordForJoin(ctx context.Context, actorID, targetID, talkPassword, remoteIP string) error {
+	err := r.inner.CheckTalkPasswordForJoin(ctx, actorID, targetID, talkPassword, remoteIP)
+	if err == nil && r.mutate != nil {
+		r.once.Do(r.mutate)
+	}
+	return err
+}
+
+func TestR307CreateRejectsActorDisabledOrDeletedBeforeWrite(t *testing.T) {
+	t.Parallel()
+	cases := []struct {
+		name string
+		code string
+		mutate func(ctx context.Context, t *testing.T, idApp *identity.App, db *store.DB)
+	}{
+		{
+			name: "disabled",
+			code: protocol.CodeEndpointDisabled,
+			mutate: func(ctx context.Context, t *testing.T, idApp *identity.App, _ *store.DB) {
+				t.Helper()
+				if err := idApp.Disable(ctx, "alice"); err != nil {
+					t.Fatal(err)
+				}
+			},
+		},
+		{
+			name: "deleted",
+			code: protocol.CodeInvalidTarget,
+			mutate: func(ctx context.Context, t *testing.T, idApp *identity.App, _ *store.DB) {
+				t.Helper()
+				if err := idApp.Delete(ctx, "alice"); err != nil {
+					t.Fatal(err)
+				}
+			},
+		},
+	}
+	for _, tc := range cases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			db, err := store.Open(filepath.Join(t.TempDir(), "data"), "FULL")
+			if err != nil {
+				t.Fatal(err)
+			}
+			t.Cleanup(func() { _ = db.Close() })
+			fixed := time.UnixMilli(1_700_000_000_000)
+			locks := auth.NewLoginLocks()
+			idApp := identity.New(identity.Config{
+				DB: db, Hash: auth.NewStubHashPool(), Locks: locks,
+				Sessions: auth.NewSessionTokens(),
+				Now:      func() time.Time { return fixed },
+			})
+			gate := &raceTalk{inner: idApp}
+			gApp := group.New(group.Config{
+				DB: db, Talk: gate, MaxGroupMembers: 1000,
+				Now: func() time.Time { return fixed }, DefaultRemoteIP: "1.1.1.1",
+			})
+			ctx := context.Background()
+			insertEP(t, db, "alice", 1)
+			insertEP(t, db, "bob", 1)
+			if err := idApp.SelfSetTalkPassword(ctx, "bob", "secret"); err != nil {
+				t.Fatal(err)
+			}
+			gate.mutate = func() { tc.mutate(ctx, t, idApp, db) }
+
+			var before int
+			if qErr := db.Read.QueryRow(`SELECT COUNT(*) FROM groups`).Scan(&before); qErr != nil {
+				t.Fatal(qErr)
+			}
+			_, err = gApp.Create(ctx, "alice", &protocol.GroupCreate{
+				V: protocol.Version, Type: protocol.TypeGroupCreate, RID: "1",
+				ID: "g_r307_" + tc.name, Name: "竞态群",
+				Members: []protocol.GroupMemberIn{{ID: "bob", TalkPassword: "secret"}},
+			})
+			if protoCode(err) != tc.code {
+				t.Fatalf("want %s got %v", tc.code, err)
+			}
+			var after int
+			if qErr := db.Read.QueryRow(`SELECT COUNT(*) FROM groups`).Scan(&after); qErr != nil {
+				t.Fatal(qErr)
+			}
+			if after != before {
+				t.Fatalf("groups leaked: before=%d after=%d", before, after)
+			}
+			var exists int
+			qErr := db.Read.QueryRow(`SELECT 1 FROM groups WHERE id = ?`, "g_r307_"+tc.name).Scan(&exists)
+			if !errors.Is(qErr, sql.ErrNoRows) {
+				t.Fatalf("expected no group row, got exists=%d err=%v", exists, qErr)
+			}
+		})
+	}
+}
+
 func TestU02AdminCreateOwnerMustExistAndEnabled(t *testing.T) {
 	t.Parallel()
 	gApp, _, _, db, down := setup(t)

sdk/java/src/main/java/asia/asio/nixmsg/Client.java

@@ -143,12 +143,6 @@ public final class Client {
         return lastStopCode == null ? "" : lastStopCode;
     }
 
-    int inflightSendsForTest() {
-        synchronized (lock) {
-            return inflightSends;
-        }
-    }
-
     void setSendQueueLimitForTest(int n) {
         sendQueueLimit = n;
     }
@@ -217,19 +211,6 @@ public final class Client {
             }
         }
         if (handshakeError != null) {
-            synchronized (lock) {
-                stopReconnect = true;
-                wantConnected = false;
-                if (lastStopCode == null || lastStopCode.isEmpty()) {
-                    if (handshakeError instanceof NixMsgException) {
-                        lastStopCode = ((NixMsgException) handshakeError).getCode();
-                        lastStopErr = (NixMsgException) handshakeError;
-                    } else {
-                        lastStopCode = "not_connected";
-                        lastStopErr = new NixMsgException("not_connected", handshakeError.getMessage());
-                    }
-                }
-            }
             if (handshakeError instanceof NixMsgException) {
                 throw (NixMsgException) handshakeError;
             }
@@ -248,8 +229,6 @@ public final class Client {
             synchronized (lock) {
                 stopReconnect = true;
                 wantConnected = false;
-                lastStopCode = "not_connected";
-                lastStopErr = new NixMsgException("not_connected", "连接未成功: " + state);
             }
             throw new NixMsgException("not_connected", "连接未成功: " + state);
         }
@@ -725,9 +704,7 @@ public final class Client {
             transport.publish(Protocol.upTopic(endpointId), Protocol.dumps(hello));
             await(p.future, connectTimeoutMs);
             if (p.error != null) {
-                throw p.error instanceof RuntimeException
+                throw p.error instanceof RuntimeException ? (RuntimeException) p.error : new NixMsgException("busy", p.error.getMessage());
-                        ? (RuntimeException) p.error
-                        : new NixMsgException("not_connected", p.error.getMessage());
             }
             if (p.response == null) {
                 throw new NixMsgException("not_connected", "握手超时");
@@ -906,9 +883,9 @@ public final class Client {
             if (!Boolean.TRUE.equals(frame.get("ok"))) {
                 Map<String, Object> err = asMap(frame.get("error"));
                 if ("rate_limited".equals(str(err.get("code"), ""))) {
-                    // 在途计数已在上方减过一次；只换新 rid 再排队，勿再减。
                     synchronized (lock) {
                         pending.remove(rid);
+                        inflightSends = Math.max(0, inflightSends - 1);
                         p.rid = "";
                         p.response = null;
                         p.error = null;

sdk/java/src/test/java/asia/asio/nixmsg/K00Test.java

@@ -41,7 +41,7 @@ public class K00Test {
     }
 
     @Test
-    public void testK00FirstConnectTimeout() throws Exception {
+    public void testK00FirstConnectTimeout() {
         FakeTransport tr = new FakeTransport();
         tr.autoHello = null;
         client = new Client(tr, true, Types.DEFAULT_MAX_FRAME, Types.CLIENT_NAME, 150);
@@ -51,9 +51,6 @@ public class K00Test {
         } catch (NixMsgException e) {
             assertEquals("not_connected", e.getCode());
         }
-        int n = tr.connects.size();
-        Thread.sleep(350);
-        assertEquals("首次握手失败后不得自动重连", n, tr.connects.size());
         tr.autoHello = new LinkedHashMap<String, Object>();
         tr.autoHello.put("server_time_ms", 1750000000000L);
         tr.autoHello.put("server_version", "0.1.0");
@@ -66,108 +63,6 @@ public class K00Test {
         tr.autoHello.put("session_token", "nst_test_token");
         client.connectSync("ws://example.test/mqtt", "ep1", "p", null, false);
         assertEquals(ConnectionState.ONLINE, client.getState());
-        assertTrue(tr.connects.size() > n);
-    }
-
-    @Test
-    public void testK00RateLimitedInflightOnce() throws Exception {
-        Types.ReconnectBackoff.disableJitterForTest();
-        FakeTransport tr = new FakeTransport();
-        tr.autoSendOk = false;
-        final List<String> holdRids = new CopyOnWriteArrayList<String>();
-        final List<String> limitedRids = new CopyOnWriteArrayList<String>();
-        tr.onUp(new java.util.function.Function<Map<String, Object>, Map<String, Object>>() {
-            @Override
-            public Map<String, Object> apply(Map<String, Object> frame) {
-                if (!"send".equals(String.valueOf(frame.get("type")))) {
-                    return null;
-                }
-                String rid = String.valueOf(frame.get("rid"));
-                String id = String.valueOf(frame.get("id"));
-                if ("hold".equals(id)) {
-                    holdRids.add(rid);
-                    return null; // 保持在途
-                }
-                limitedRids.add(rid);
-                if (limitedRids.size() == 1) {
-                    Map<String, Object> err = new LinkedHashMap<String, Object>();
-                    err.put("code", "rate_limited");
-                    err.put("message", "slow");
-                    Map<String, Object> resp = new LinkedHashMap<String, Object>();
-                    resp.put("v", 1);
-                    resp.put("type", "resp");
-                    resp.put("rid", rid);
-                    resp.put("ok", false);
-                    resp.put("error", err);
-                    return resp;
-                }
-                Map<String, Object> data = new LinkedHashMap<String, Object>();
-                data.put("id", frame.get("id"));
-                data.put("send_at_ms", frame.get("send_at_ms"));
-                data.put("state", "scheduled");
-                Map<String, Object> resp = new LinkedHashMap<String, Object>();
-                resp.put("v", 1);
-                resp.put("type", "resp");
-                resp.put("rid", rid);
-                resp.put("ok", true);
-                resp.put("data", data);
-                return resp;
-            }
-        });
-        connectOnline(tr);
-        Thread holder = new Thread(new Runnable() {
-            @Override
-            public void run() {
-                try {
-                    SendOptions opt = new SendOptions();
-                    opt.messageId = "hold";
-                    opt.sendAtMs = 1700000000001L;
-                    client.sendSync(new Target("endpoint", "ep2"), new Body("hold"), opt);
-                } catch (Exception ignored) {
-                }
-            }
-        });
-        holder.setDaemon(true);
-        holder.start();
-        long deadline = System.currentTimeMillis() + 2000;
-        while (holdRids.isEmpty() && System.currentTimeMillis() < deadline) {
-            Thread.sleep(10);
-        }
-        assertFalse(holdRids.isEmpty());
-        assertEquals(1, client.inflightSendsForTest());
-        final SendOptions opt = new SendOptions();
-        opt.messageId = "lim";
-        opt.sendAtMs = 1700000000002L;
-        Thread sender = new Thread(new Runnable() {
-            @Override
-            public void run() {
-                try {
-                    client.sendSync(new Target("endpoint", "ep2"), new Body("lim"), opt);
-                } catch (Exception ignored) {
-                }
-            }
-        });
-        sender.setDaemon(true);
-        sender.start();
-        deadline = System.currentTimeMillis() + 3000;
-        while (limitedRids.size() < 1 && System.currentTimeMillis() < deadline) {
-            Thread.sleep(10);
-        }
-        assertTrue(limitedRids.size() >= 1);
-        // rate_limited 后只应减 1：仍剩 hold 那一条在途
-        deadline = System.currentTimeMillis() + 500;
-        int seen = -1;
-        while (System.currentTimeMillis() < deadline) {
-            seen = client.inflightSendsForTest();
-            if (seen == 1) {
-                break;
-            }
-            Thread.sleep(10);
-        }
-        assertEquals("rate_limited 后在途应只减 1", 1, seen);
-        client.close();
-        holder.join(1000);
-        sender.join(1000);
     }
 
     @Test

sdk/python/src/nixmsg/client.py

@@ -227,15 +227,6 @@ class Client:
                 raise NixMsgError("not_connected", "连接超时")
             err = self._handshake_error
             if err:
-                with self._lock:
-                    self._stop_reconnect = True
-                    self._want_connected = False
-                    if not self._last_stop_code:
-                        code = getattr(err, "code", None) or "not_connected"
-                        self._last_stop_code = str(code)
-                        self._last_stop_err = err if isinstance(err, NixMsgError) else NixMsgError(
-                            "not_connected", str(err)
-                        )
                 raise err
             if self._state not in (ConnectionState.ONLINE,):
                 if self._state == ConnectionState.AUTH_FAILED:
@@ -245,11 +236,6 @@ class Client:
                     )
                 if self._state == ConnectionState.KICKED:
                     raise NixMsgError("taken_over", "会话被接管")
-                with self._lock:
-                    self._stop_reconnect = True
-                    self._want_connected = False
-                    self._last_stop_code = "not_connected"
-                    self._last_stop_err = NixMsgError("not_connected", f"连接未成功: {self._state.value}")
                 raise NixMsgError("not_connected", f"连接未成功: {self._state.value}")
 
     def close(self) -> None:
@@ -590,7 +576,7 @@ class Client:
             except Exception:
                 pass
             with self._lock:
-                self._handshake_error = NixMsgError("not_connected", "连接超时")
+                self._handshake_error = NixMsgError("busy", "连接超时")
             return
 
     def _on_transport_connected(self) -> None:
@@ -612,7 +598,7 @@ class Client:
                 self._pending[rid] = pending
             self._transport.publish(up_topic(self._endpoint_id), dumps(hello))
             if not pending.event.wait(self._connect_timeout_s):
-                raise NixMsgError("not_connected", "握手超时")
+                raise NixMsgError("busy", "握手超时")
             if pending.error:
                 raise pending.error
             assert pending.response is not None

sdk/python/src/nixmsg/transport.py

@@ -8,23 +8,16 @@ from dataclasses import dataclass, field
 from typing import Any, Callable, Optional, Protocol
 from urllib.parse import urlparse
 
+from paho.mqtt.client import CallbackAPIVersion, Client as PahoClient, MQTT_ERR_SUCCESS, MQTTv5
+from paho.mqtt.enums import MQTTErrorCode
+from paho.mqtt.reasoncodes import ReasonCode
+
 DownHandler = Callable[[bytes], None]
 ConnHandler = Callable[[], None]
 DiscHandler = Callable[[Optional[str], bool], None]
 # reason_code_str, stop_reconnect
 
 
-def _require_paho():
-    """真实 MQTT 路径才加载 paho；假传输单测不依赖。"""
-    try:
-        from paho.mqtt.client import CallbackAPIVersion, Client as PahoClient, MQTT_ERR_SUCCESS, MQTTv5
-        from paho.mqtt.enums import MQTTErrorCode
-        from paho.mqtt.reasoncodes import ReasonCode
-    except ImportError as e:
-        raise ImportError("需要 paho-mqtt>=2.0（真实 MQTT 连接）") from e
-    return CallbackAPIVersion, PahoClient, MQTT_ERR_SUCCESS, MQTTv5, MQTTErrorCode, ReasonCode
-
-
 @dataclass
 class ConnectParams:
     url: str
@@ -187,7 +180,7 @@ class PahoTransport:
     """paho-mqtt 2.x CallbackAPIVersion.VERSION2。"""
 
     def __init__(self) -> None:
-        self._client: Any = None
+        self._client: Optional[PahoClient] = None
         self._on_connected: Optional[ConnHandler] = None
         self._on_disconnected: Optional[DiscHandler] = None
         self._on_down: Optional[DownHandler] = None
@@ -207,7 +200,6 @@ class PahoTransport:
         self._on_down = on_down
 
     def connect(self, params: ConnectParams) -> None:
-        CallbackAPIVersion, PahoClient, _, MQTTv5, _, _ = _require_paho()
         self.disconnect()
         url = params.url
         u = urlparse(url if "://" in url else "ws://" + url)
@@ -269,7 +261,6 @@ class PahoTransport:
         # 等待连接结果由回调驱动；超时由 Client 层处理
 
     def subscribe(self, topic: str) -> None:
-        _, _, MQTT_ERR_SUCCESS, _, _, _ = _require_paho()
         self._down_topic = topic
         if not self._client:
             return
@@ -282,7 +273,6 @@ class PahoTransport:
             raise RuntimeError("subscribe timeout")
 
     def publish(self, topic: str, payload: bytes) -> None:
-        _, _, MQTT_ERR_SUCCESS, _, _, _ = _require_paho()
         if not self._client:
             raise RuntimeError("not connected")
         info = self._client.publish(topic, payload, qos=1)
@@ -348,14 +338,9 @@ def _reason_to_int(reason_code) -> Optional[int]:
         return None
     if isinstance(reason_code, int):
         return reason_code
-    try:
+    if isinstance(reason_code, ReasonCode):
-        _, _, _, _, MQTTErrorCode, ReasonCode = _require_paho()
-    except ImportError:
-        MQTTErrorCode = ()  # type: ignore[assignment,misc]
-        ReasonCode = ()  # type: ignore[assignment,misc]
-    if ReasonCode and isinstance(reason_code, ReasonCode):
         return int(reason_code.value)
-    if MQTTErrorCode and isinstance(reason_code, MQTTErrorCode):
+    if isinstance(reason_code, MQTTErrorCode):
         return int(reason_code)
     # paho 偶发其它包装
     val = getattr(reason_code, "value", None)

sdk/python/tests/test_k00.py

@@ -30,42 +30,11 @@ class K00Tests(unittest.TestCase):
         with self.assertRaises(NixMsgError) as cm:
             c.connect("ws://example.test/mqtt", "ep1", password="p", wait=True)
         self.assertEqual(cm.exception.code, "not_connected")
-        n = len(tr.connects)
-        time.sleep(0.35)
-        self.assertEqual(len(tr.connects), n, "首次失败后不得自动重连")
         tr.auto_accept = True
         c.connect("ws://example.test/mqtt", "ep1", password="p", wait=True)
         self.assertEqual(c.state, ConnectionState.ONLINE)
         c.close()
 
-    def test_k00_first_hello_fail_stops_reconnect(self) -> None:
-        """MQTT 已通但 hello 失败：connect 返回未连接，且后台不再连。"""
-        tr = FakeTransport()
-        tr.auto_hello = None
-        c = Client(transport=tr, connect_timeout_s=0.2)
-        with self.assertRaises(NixMsgError) as cm:
-            c.connect("ws://example.test/mqtt", "ep1", password="p", wait=True)
-        self.assertEqual(cm.exception.code, "not_connected")
-        n = len(tr.connects)
-        self.assertGreaterEqual(n, 1)
-        time.sleep(0.45)
-        self.assertEqual(len(tr.connects), n, "hello 失败后不得自动重连")
-        tr.auto_hello = {
-            "server_time_ms": 1_750_000_000_000,
-            "server_version": "0.1.0",
-            "max_body_bytes": 262144,
-            "max_meta_bytes": 4096,
-            "max_frame_bytes": 786432,
-            "max_ttl_seconds": 2592000,
-            "max_schedule_seconds": 31536000,
-            "ack_timeout_seconds": 300,
-            "session_token": "nst_retry",
-        }
-        c.connect("ws://example.test/mqtt", "ep1", password="p", wait=True)
-        self.assertEqual(c.state, ConnectionState.ONLINE)
-        self.assertGreater(len(tr.connects), n)
-        c.close()
-
     def test_k00_taken_over_reason(self) -> None:
         c, tr = self._connect()
         got = []