Fix #212

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/contact/GroupImpl.kt

@@ -65,7 +65,8 @@ internal class GroupImpl(
 ) : Group() {
     companion object
 
-    val lastRecalledMessageRandoms: LockFreeLinkedList<Int> = LockFreeLinkedList()
+    val lastRecalledMessageRandoms: LockFreeCacheList<Int> = LockFreeCacheList(16) // events per 3 second
+    val lastMemberPermissionChangeSequences: LockFreeCacheList<Int> = LockFreeCacheList(16) // events per 3 second
 
     override val bot: QQAndroidBot by bot.unsafeWeakRef()
 

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/contact/MemberImpl.kt

@@ -49,6 +49,7 @@ internal class MemberImpl constructor(
 ) : Member() {
     override val group: GroupImpl by group.unsafeWeakRef()
 
+    @Suppress("unused") // false positive
     val lastMessageSequence: AtomicInt = atomic(-1)
 
     // region QQ delegate

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/contact/util.kt

@@ -25,6 +25,7 @@ import net.mamoe.mirai.qqandroid.message.ensureSequenceIdAvailable
 import net.mamoe.mirai.qqandroid.message.firstIsInstanceOrNull
 import net.mamoe.mirai.qqandroid.network.QQAndroidBotNetworkHandler
 import net.mamoe.mirai.qqandroid.network.protocol.packet.chat.receive.MessageSvc
+import net.mamoe.mirai.utils.LockFreeLinkedList
 import net.mamoe.mirai.utils.MiraiExperimentalAPI
 import net.mamoe.mirai.utils.MiraiInternalAPI
 
@@ -61,3 +62,27 @@ internal fun Contact.logMessageSent(message: Message) {
 internal fun String.singleLine(): String {
     return this.replace("\n", """\n""").replace("\r", "")
 }
+
+
+/**
+ * Size management isn't atomic.
+ */
+internal class LockFreeCacheList<E>(private val maxSize: Int) : LockFreeLinkedList<E>() {
+    override fun addLast(element: E) {
+        if (size >= maxSize) {
+            this.removeFirst()
+        }
+
+        super.addLast(element)
+    }
+
+    @Deprecated("prohibited", level = DeprecationLevel.HIDDEN)
+    override fun addAll(iterable: Iterable<E>) {
+        super.addAll(iterable)
+    }
+
+    @Deprecated("prohibited", level = DeprecationLevel.HIDDEN)
+    override fun addAll(iterable: Sequence<E>) {
+        super.addAll(iterable)
+    }
+}
\ No newline at end of file

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/data/proto/OnlinePush.kt

@@ -47,7 +47,7 @@ internal class OnlinePushTrans : ProtoBuf {
         @ProtoId(9) val nickName: String = "",
         @ProtoId(10) val msgData: ByteArray = EMPTY_BYTE_ARRAY,
         @ProtoId(11) val svrIp: Int = 0,
-        @ProtoId(12) val extGroupKeyInfo: OnlinePushTrans.ExtGroupKeyInfo? = null,
+        @ProtoId(12) val extGroupKeyInfo: ExtGroupKeyInfo? = null,
         @ProtoId(17) val generalFlag: Int = 0
     ) : ProtoBuf
 }
\ No newline at end of file

mirai-core-qqandroid/src/commonMain/kotlin/net/mamoe/mirai/qqandroid/network/protocol/packet/chat/receive/OnlinePush.kt

@@ -113,9 +113,9 @@ internal class OnlinePush {
         IncomingPacketFactory<Packet?>("OnlinePush.PbPushTransMsg", "OnlinePush.RespPush") {
 
         @OptIn(MiraiInternalAPI::class)
-        @ExperimentalUnsignedTypes
         override suspend fun ByteReadPacket.decode(bot: QQAndroidBot, sequenceId: Int): Packet? {
             val content = this.readProtoBuf(OnlinePushTrans.PbMsgInfo.serializer())
+
             content.msgData.read<Unit> {
                 when (content.msgType) {
                     44 -> {
@@ -128,21 +128,33 @@ internal class OnlinePush {
                         }
 
                         val group = bot.getGroupByUin(content.fromUin) as GroupImpl
+                        if (group.lastMemberPermissionChangeSequences.remove(content.msgSeq)) {
+                            return null
+                        }
+
                         if (var5 == 0L && this.remaining == 1L) {//管理员变更
+                            group.lastMemberPermissionChangeSequences.addLast(content.msgSeq)
                             val newPermission =
-                                if (this.readByte()
-                                        .toInt() == 1
-                                ) MemberPermission.ADMINISTRATOR else MemberPermission.MEMBER
+                                if (this.readByte().toInt() == 1) MemberPermission.ADMINISTRATOR
+                                else MemberPermission.MEMBER
+
+                            if (target == bot.id) {
+                                if (group.botPermission == newPermission) {
+                                    return null
+                                }
 
-                            return if (target == bot.id) {
-                                BotGroupPermissionChangeEvent(
+                                return BotGroupPermissionChangeEvent(
                                     group,
                                     group.botPermission.also { group.botPermission = newPermission },
                                     newPermission
                                 )
                             } else {
                                 val member = group[target] as MemberImpl
-                                MemberPermissionChangeEvent(
+                                if (member.permission == newPermission) {
+                                    return null
+                                }
+
+                                return MemberPermissionChangeEvent(
                                     member,
                                     member.permission.also { member.permission = newPermission },
                                     newPermission
@@ -173,21 +185,17 @@ internal class OnlinePush {
                         val groupUin = content.fromUin
 
                         when (type) {
-                            0x82 -> { // 2020/4/8: 在这里拿到了一个 Group xxx not found
-                                bot.getGroupByUinOrNull(groupUin)?.let { group ->
-                                    val member = group.getOrNull(target) as? MemberImpl ?: return null
-                                    return MemberLeaveEvent.Quit(member.also {
-                                        group.members.delegate.remove(member)
-                                    })
-                                }
+                            0x82 -> bot.getGroupByUinOrNull(groupUin)?.let { group ->
+                                val member = group.getOrNull(target) as? MemberImpl ?: return null
+                                return MemberLeaveEvent.Quit(member.also {
+                                    group.members.delegate.remove(member)
+                                })
                             }
-                            0x83 -> {
-                                bot.getGroupByUin(groupUin).let { group ->
-                                    val member = group.getOrNull(target) as? MemberImpl ?: return null
-                                    return MemberLeaveEvent.Kick(member.also {
-                                        group.members.delegate.remove(member)
-                                    }, group.members[operator])
-                                }
+                            0x83 -> bot.getGroupByUin(groupUin).let { group ->
+                                val member = group.getOrNull(target) as? MemberImpl ?: return null
+                                return MemberLeaveEvent.Kick(member.also {
+                                    group.members.delegate.remove(member)
+                                }, group.members[operator])
                             }
                         }
                     }