[core] Implement a more efficient algorithm to fetch roaming messages for group:

- Added `RoamingMessagesImplGroup`.
- Dump API changes for Group RoamingMessages.
- [mock] Fix MockRoamingMessages missing MessageSource
- [core] Convert hierarchical TimeBasedRoamingMessagesImpl to common, to reduce code complexity

mirai-core-api/compatibility-validation/android/api/android.api

@@ -366,7 +366,7 @@ public abstract interface class net/mamoe/mirai/contact/Friend : kotlinx/corouti
 	public abstract fun setRemark (Ljava/lang/String;)V
 }
 
-public abstract interface class net/mamoe/mirai/contact/Group : kotlinx/coroutines/CoroutineScope, net/mamoe/mirai/contact/AudioSupported, net/mamoe/mirai/contact/Contact, net/mamoe/mirai/contact/FileSupported {
+public abstract interface class net/mamoe/mirai/contact/Group : kotlinx/coroutines/CoroutineScope, net/mamoe/mirai/contact/AudioSupported, net/mamoe/mirai/contact/Contact, net/mamoe/mirai/contact/FileSupported, net/mamoe/mirai/contact/roaming/RoamingSupported {
 	public static final field Companion Lnet/mamoe/mirai/contact/Group$Companion;
 	public fun avatarUrl (Lnet/mamoe/mirai/contact/AvatarSpec;)Ljava/lang/String;
 	public abstract fun contains (J)Z

mirai-core-api/compatibility-validation/jvm/api/jvm.api

@@ -366,7 +366,7 @@ public abstract interface class net/mamoe/mirai/contact/Friend : kotlinx/corouti
 	public abstract fun setRemark (Ljava/lang/String;)V
 }
 
-public abstract interface class net/mamoe/mirai/contact/Group : kotlinx/coroutines/CoroutineScope, net/mamoe/mirai/contact/AudioSupported, net/mamoe/mirai/contact/Contact, net/mamoe/mirai/contact/FileSupported {
+public abstract interface class net/mamoe/mirai/contact/Group : kotlinx/coroutines/CoroutineScope, net/mamoe/mirai/contact/AudioSupported, net/mamoe/mirai/contact/Contact, net/mamoe/mirai/contact/FileSupported, net/mamoe/mirai/contact/roaming/RoamingSupported {
 	public static final field Companion Lnet/mamoe/mirai/contact/Group$Companion;
 	public fun avatarUrl (Lnet/mamoe/mirai/contact/AvatarSpec;)Ljava/lang/String;
 	public abstract fun contains (J)Z

mirai-core-mock/src/database/MessageDatabase.kt

@@ -11,9 +11,7 @@ package net.mamoe.mirai.mock.database
 
 import net.mamoe.mirai.contact.Contact
 import net.mamoe.mirai.contact.roaming.RoamingMessageFilter
-import net.mamoe.mirai.message.data.MessageChain
-import net.mamoe.mirai.message.data.MessageSource
-import net.mamoe.mirai.message.data.MessageSourceKind
+import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.mock.MockBot
 import net.mamoe.mirai.mock.internal.db.MsgDatabaseImpl
 import net.mamoe.mirai.utils.concatAsLong
@@ -80,6 +78,29 @@ public data class MessageInfo(
     public val time: Long, // seconds
     public val message: MessageChain,
 ) {
+    public fun buildSource(bot: MockBot): MessageSource {
+        return bot.buildMessageSource(kind = kind) {
+            val info = this@MessageInfo
+            sender(info.sender)
+            time(info.time.toInt())
+
+            if (kind == MessageSourceKind.GROUP) {
+                target(subject)
+            } else {
+                if (info.sender == info.subject) {
+                    target(bot.id)
+                } else {
+                    target(info.subject)
+                }
+            }
+
+            ids = intArrayOf(info.id)
+            internalIds = intArrayOf(info.internal)
+
+            messages(info.message as Iterable<Message>)
+        }
+    }
+
     // ids
     public val id: Int get() = (mixinedMsgId shr 32).toInt()
 

mirai-core-mock/src/internal/contact/roaming/MockRoamingMessages.kt

@@ -20,6 +20,7 @@ import net.mamoe.mirai.contact.roaming.RoamingSupported
 import net.mamoe.mirai.message.data.MessageChain
 import net.mamoe.mirai.message.data.MessageSourceKind
 import net.mamoe.mirai.mock.internal.MockBotImpl
+import net.mamoe.mirai.mock.utils.mock
 import net.mamoe.mirai.utils.JavaFriendlyAPI
 import net.mamoe.mirai.utils.cast
 import java.util.stream.Stream
@@ -54,7 +55,7 @@ internal class MockRoamingMessages(
             timeStart,
             timeEnd,
             filter ?: RoamingMessageFilter.ANY
-        ).map { it.message }
+        ).map { it.buildSource(contact.bot.mock()) + it.message }
     }
 
     @JavaFriendlyAPI

mirai-core-mock/test/mock/MessagingTest.kt

@@ -24,7 +24,7 @@ import kotlin.test.assertFails
 import kotlin.test.assertNull
 import kotlin.test.assertSame
 
-internal class MessagingTest: MockBotTestBase() {
+internal class MessagingTest : MockBotTestBase() {
 
     @Test
     internal fun testMessageEventBroadcast() = runTest {
@@ -133,35 +133,51 @@ internal class MessagingTest: MockBotTestBase() {
     @Test
     internal fun testRoamingMessages() = runTest {
         val mockFriend = bot.addFriend(1, "1")
+
+        val allSent = mutableListOf<MessageSource>()
+        fun MutableList<MessageSource>.add(msg: MessageChain) {
+            add(msg.source)
+        }
+
+        fun MutableList<MessageSource>.convertToOffline() {
+            replaceAll { src ->
+                bot.buildMessageSource(src.kind) { allFrom(src) }
+            }
+        }
+
         broadcastMockEvents {
-            mockFriend says { append("Testing!") }
-            mockFriend says { append("Test2!") }
+            allSent.add(mockFriend says { append("Testing!") })
+            allSent.add(mockFriend says { append("Test2!") })
         }
-        mockFriend.sendMessage("Pong!")
+        allSent.add(mockFriend.sendMessage("Pong!").source)
+        allSent.convertToOffline()
 
         mockFriend.roamingMessages.getAllMessages().toList().let { messages ->
             assertEquals(3, messages.size)
-            assertEquals(messageChainOf(PlainText("Testing!")), messages[0])
-            assertEquals(messageChainOf(PlainText("Test2!")), messages[1])
-            assertEquals(messageChainOf(PlainText("Pong!")), messages[2])
+            assertEquals(messageChainOf(allSent[0] + PlainText("Testing!")), messages[0])
+            assertEquals(messageChainOf(allSent[1] + PlainText("Test2!")), messages[1])
+            assertEquals(messageChainOf(allSent[2] + PlainText("Pong!")), messages[2])
         }
 
+        allSent.clear()
+
         val mockGroup = bot.addGroup(2, "2")
         val mockGroupMember1 = mockGroup.addMember(123, "123")
         val mockGroupMember2 = mockGroup.addMember(124, "124")
         val mockGroupMember3 = mockGroup.addMember(125, "125")
 
         broadcastMockEvents {
-            mockGroupMember1 says { append("msg1") }
-            mockGroupMember2 says { append("msg2") }
-            mockGroupMember3 says { append("msg3") }
+            allSent.add(mockGroupMember1 says { append("msg1") })
+            allSent.add(mockGroupMember2 says { append("msg2") })
+            allSent.add(mockGroupMember3 says { append("msg3") })
         }
+        allSent.convertToOffline()
 
         with(mockGroup.roamingMessages.getAllMessages().toList()) {
             assertEquals(3, size)
-            assertEquals(messageChainOf(PlainText("msg1")), get(0))
-            assertEquals(messageChainOf(PlainText("msg2")), get(1))
-            assertEquals(messageChainOf(PlainText("msg3")), get(2))
+            assertEquals(messageChainOf(allSent[0] + PlainText("msg1")), get(0))
+            assertEquals(messageChainOf(allSent[1] + PlainText("msg2")), get(1))
+            assertEquals(messageChainOf(allSent[2] + PlainText("msg3")), get(2))
         }
     }
 

mirai-core/src/commonMain/kotlin/contact/roaming/RoamingMessagesImplGroup.kt

@@ -9,79 +9,84 @@
 
 package net.mamoe.mirai.internal.contact.roaming
 
+import kotlinx.coroutines.flow.*
+import net.mamoe.mirai.contact.roaming.RoamingMessageFilter
 import net.mamoe.mirai.internal.contact.CommonGroupImpl
+import net.mamoe.mirai.internal.message.getMessageSourceKindFromC2cCmdOrNull
+import net.mamoe.mirai.internal.message.toMessageChainOnline
 import net.mamoe.mirai.internal.network.protocol.data.proto.MsgComm
 import net.mamoe.mirai.internal.network.protocol.packet.chat.TroopManagement
 import net.mamoe.mirai.internal.network.protocol.packet.chat.receive.MessageSvcPbGetGroupMsg
-import net.mamoe.mirai.internal.network.protocol.packet.chat.receive.MessageSvcPbGetRoamMsgReq
-import net.mamoe.mirai.internal.utils.indexFirstBE
+import net.mamoe.mirai.message.data.MessageChain
 
 internal class RoamingMessagesImplGroup(
     override val contact: CommonGroupImpl
-) : TimeBasedRoamingMessagesImpl() {
-    override suspend fun requestRoamMsg(
-        timeStart: Long,
-        lastMessageTime: Long,
-        random: Long // unused field
-    ): MessageSvcPbGetRoamMsgReq.Response {
-        val lastMsgSeq = contact.bot.network.sendAndExpect(
-            TroopManagement.GetGroupLastMsgSeq(
-                client = contact.bot.client,
-                groupUin = contact.uin
-            )
-        )
-        return when (lastMsgSeq) {
-            is TroopManagement.GetGroupLastMsgSeq.Response.Success -> {
-                val results = mutableListOf<MsgComm.Msg>()
-                var currentSeq = lastMsgSeq.seq
+) : AbstractRoamingMessages() {
+    private val bot get() = contact.bot
 
-                while (true) {
-                    if (currentSeq <= 0) break
+    override suspend fun getMessagesIn(
+        timeStart: Long,
+        timeEnd: Long,
+        filter: RoamingMessageFilter?
+    ): Flow<MessageChain> {
+        var currentSeq: Int = getLastMsgSeq() ?: return emptyFlow()
 
-                    val resp = contact.bot.network.sendAndExpect(
-                        MessageSvcPbGetGroupMsg(
-                            client = contact.bot.client,
-                            groupUin = contact.uin,
-                            messageSequence = currentSeq,
-                            20 // maximum 20
-                        )
+        return flow {
+            while (true) {
+                val resp = contact.bot.network.sendAndExpect(
+                    MessageSvcPbGetGroupMsg(
+                        client = contact.bot.client,
+                        groupUin = contact.uin,
+                        messageSequence = currentSeq.toLong(),
+                        count = 20 // maximum 20
                     )
-                    if (resp is MessageSvcPbGetGroupMsg.Failed) break
-                    if ((resp as MessageSvcPbGetGroupMsg.Success).msgElem.isEmpty()) break
+                )
+
+                if (resp is MessageSvcPbGetGroupMsg.Failed) break
+                resp as MessageSvcPbGetGroupMsg.Success // stupid smart cast
+                if (resp.msgElem.isEmpty()) break
 
-                    // the message may be sorted increasing by message time,
-                    // if so, additional sortBy will not take cost.
-                    val msgElems = resp.msgElem.sortedBy { it.msgHead.msgTime }
-                    results.addAll(0, msgElems)
+                // the message may be sorted increasing by message time,
+                // if so, additional sortBy will not take cost.
+                val messageTimeSequence = resp.msgElem.asSequence().map { it.time }
 
-                    val firstMsgElem = msgElems.first()
-                    if (firstMsgElem.msgHead.msgTime < timeStart) {
-                        break
-                    } else {
-                        currentSeq = (firstMsgElem.msgHead.msgSeq - 1).toLong()
-                    }
-                }
+                val maxTime = messageTimeSequence.max()
 
-                // use binary search to find the first message that message time is lager than lastMessageTime
-                var right = results.indexFirstBE(lastMessageTime) { it.msgHead.msgTime.toLong() }
-                // check messages with same time
-                if (results[right].msgHead.msgTime.toLong() == lastMessageTime) {
-                    do {
-                        right++
-                    } while (right <= results.size - 1 && results[right].msgHead.msgTime <= lastMessageTime)
-                }
-                // loops at most 20 times, just traverse
-                val left = results.indexOfFirst { it.msgHead.msgTime >= timeStart }
+                if (maxTime < timeStart) break // we have fetched all messages
 
-                MessageSvcPbGetRoamMsgReq.Response(
-                    if (left == right) null else results.subList(left, right),
-                    if (left == right) -1L else results[right - 1].msgHead.msgTime.toLong(), -1L, byteArrayOf()
+                emitAll(
+                    resp.msgElem.asSequence()
+                        .filter { getMessageSourceKindFromC2cCmdOrNull(it.msgHead.c2cCmd) != null } // ignore unsupported messages
+                        .filter { it.time in timeStart..timeEnd }
+                        .sortedByDescending { it.time } // Ensure caller receiver newer messages first
+                        .filter { filter.apply(it) } // Call filter after sort
+                        .asFlow()
+                        .map { it.toMessageChainOnline(bot) }
                 )
-            }
 
-            is TroopManagement.GetGroupLastMsgSeq.Response.Failed -> {
-                MessageSvcPbGetRoamMsgReq.Response(null, -1L, -1L, byteArrayOf())
+                currentSeq = resp.msgElem.minBy { it.time }.msgHead.msgSeq
             }
         }
     }
+
+    private val MsgComm.Msg.time get() = msgHead.msgTime
+
+    private fun RoamingMessageFilter?.apply(
+        it: MsgComm.Msg
+    ) = this?.invoke(createRoamingMessage(it, listOf())) != false
+
+    private suspend fun getLastMsgSeq(): Int? {
+        // Iterate from the newest message to find messages within [timeStart] and [timeEnd]
+        val lastMsgSeqResp = bot.network.sendAndExpect(
+            TroopManagement.GetGroupLastMsgSeq(
+                client = bot.client,
+                groupUin = contact.uin
+            )
+        )
+
+        return when (lastMsgSeqResp) {
+            TroopManagement.GetGroupLastMsgSeq.Response.Failed -> null
+            is TroopManagement.GetGroupLastMsgSeq.Response.Success -> lastMsgSeqResp.seq
+        }
+    }
 }

mirai-core/src/commonMain/kotlin/contact/roaming/SeqBasedRoamingMessageImpl.kt

@@ -1,71 +0,0 @@
-/*
- * Copyright 2019-2022 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/dev/LICENSE
- */
-
-package net.mamoe.mirai.internal.contact.roaming
-
-import kotlinx.coroutines.currentCoroutineContext
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.flow
-import kotlinx.coroutines.isActive
-import net.mamoe.mirai.contact.roaming.RoamingMessageFilter
-import net.mamoe.mirai.internal.message.toMessageChainOnline
-import net.mamoe.mirai.internal.network.protocol.data.proto.MsgComm
-import net.mamoe.mirai.message.data.MessageChain
-
-private typealias Seq = Long
-
-internal sealed class SeqBasedRoamingMessageImpl : AbstractRoamingMessages() {
-    final override suspend fun getMessagesIn(
-        timeStart: Long,
-        timeEnd: Long,
-        filter: RoamingMessageFilter?
-    ): Flow<MessageChain> {
-        val (seqStart, seqEnd) = getSeqForTime(timeStart, timeEnd)
-        return getMessageImpl(seqStart, seqEnd, filter)
-    }
-
-    protected abstract suspend fun getSeqForTime(timeStart: Long, timeEnd: Long): Pair<Seq, Seq>
-
-    @Suppress("DuplicatedCode") // Generalizing this code would even complicate logic
-    private suspend fun getMessageImpl(
-        seqStart: Seq,
-        seqEnd: Seq,
-        filter: RoamingMessageFilter?,
-    ): Flow<MessageChain> {
-        return flow {
-            var currentSeqStart = seqEnd.coerceAtMost(seqStart)
-            while (currentCoroutineContext().isActive) {
-                val resp = requestRoamMsg(currentSeqStart, seqEnd)
-                val messages = resp.messages ?: break
-                if (filter == null || filter === RoamingMessageFilter.ANY) {
-                    // fast path
-                    messages.forEach { emit(it.toMessageChainOnline(contact.bot)) }
-                } else {
-                    for (message in messages) {
-                        if (filter.invoke(createRoamingMessage(message, messages))) {
-                            emit(message.toMessageChainOnline(contact.bot))
-                        }
-                    }
-                }
-                currentSeqStart = resp.nextSeqStart
-            }
-        }
-
-    }
-
-    abstract suspend fun requestRoamMsg(
-        seqStart: Seq,
-        seqEnd: Seq,
-    ): SeqBasedRoamingMessageChunk
-}
-
-internal interface SeqBasedRoamingMessageChunk {
-    val messages: List<MsgComm.Msg>?
-    val nextSeqStart: Seq
-}

mirai-core/src/commonMain/kotlin/contact/roaming/TimeBasedRoamingMessagesImpl.kt

@@ -20,8 +20,7 @@ import net.mamoe.mirai.internal.message.toMessageChainOnline
 import net.mamoe.mirai.internal.network.protocol.packet.chat.receive.MessageSvcPbGetRoamMsgReq
 import net.mamoe.mirai.message.data.MessageChain
 
-// Can't make sealed, used by actuals 
-internal abstract class CommonTimeBasedRoamingMessagesImpl : AbstractRoamingMessages() {
+internal sealed class TimeBasedRoamingMessagesImpl : AbstractRoamingMessages() {
     override suspend fun getMessagesIn(
         timeStart: Long,
         timeEnd: Long,
@@ -56,6 +55,3 @@ internal abstract class CommonTimeBasedRoamingMessagesImpl : AbstractRoamingMess
         random: Long
     ): MessageSvcPbGetRoamMsgReq.Response
 }
-
-
-internal expect sealed class TimeBasedRoamingMessagesImpl() : CommonTimeBasedRoamingMessagesImpl

mirai-core/src/commonMain/kotlin/message/ReceiveMessageHandler.kt

@@ -53,21 +53,26 @@ internal suspend fun List<MsgComm.Msg>.toMessageChainOnline(
     return toMessageChain(bot, groupIdOrZero, true, messageSourceKind, facade).refineDeep(bot, refineContext)
 }
 
+internal fun getMessageSourceKindFromC2cCmdOrNull(c2cCmd: Int): MessageSourceKind? {
+    return when (c2cCmd) {
+        11 -> MessageSourceKind.FRIEND // bot 给其他人发消息
+        4 -> MessageSourceKind.FRIEND // bot 给自己作为好友发消息 (非 other client)
+        1 -> MessageSourceKind.GROUP
+        else -> null
+    }
+}
+
+internal fun getMessageSourceKindFromC2cCmd(c2cCmd: Int): MessageSourceKind {
+    return getMessageSourceKindFromC2cCmdOrNull(c2cCmd) ?: error("Could not get source kind from c2cCmd: $c2cCmd")
+}
+
+
 internal suspend fun MsgComm.Msg.toMessageChainOnline(
     bot: Bot,
     refineContext: RefineContext = EmptyRefineContext,
     facade: MessageProtocolFacade = MessageProtocolFacade,
 ): MessageChain {
-    fun getSourceKind(c2cCmd: Int): MessageSourceKind {
-        return when (c2cCmd) {
-            11 -> MessageSourceKind.FRIEND // bot 给其他人发消息
-            4 -> MessageSourceKind.FRIEND // bot 给自己作为好友发消息 (非 other client)
-            1 -> MessageSourceKind.GROUP
-            else -> error("Could not get source kind from c2cCmd: $c2cCmd")
-        }
-    }
-
-    val kind = getSourceKind(msgHead.c2cCmd)
+    val kind = getMessageSourceKindFromC2cCmd(msgHead.c2cCmd)
     val groupId = when (kind) {
         MessageSourceKind.GROUP -> msgHead.groupInfo?.groupCode ?: 0
         else -> 0
@@ -141,6 +146,7 @@ internal object ReceiveMessageTransformer {
                     MessageSourceKind.STRANGER -> OnlineMessageSourceFromStrangerImpl(bot, messageList)
                 }
             }
+
             false -> {
                 OfflineMessageSourceImplData(bot, messageList, messageSourceKind)
             }

mirai-core/src/commonMain/kotlin/network/protocol/packet/chat/TroopManagement.kt

@@ -466,14 +466,14 @@ internal class TroopManagement {
     }
 
     internal object GetGroupLastMsgSeq : OutgoingPacketFactory<GetGroupLastMsgSeq.Response>("OidbSvc.0x88d_0") {
-        sealed class Response(val groupUin: Long, val seq: Long) : Packet {
+        sealed class Response(val groupUin: Long, val seq: Int) : Packet {
             object Failed : Response(-1, -1) {
                 override fun toString(): String {
                     return "TroopManagement.GetGroupLastMsgSeq.Failed"
                 }
             }
 
-            class Success(groupUin: Long, seq: Long) : Response(groupUin, seq) {
+            class Success(groupUin: Long, seq: Int) : Response(groupUin, seq) {
                 override fun toString(): String {
                     return "TroopManagement.GetGroupLastMsgSeq.Response(groupUin=${groupUin}, seq=${seq})"
                 }
@@ -511,7 +511,7 @@ internal class TroopManagement {
             val info = group.stgroupinfo ?: return Response.Failed
             val seq = info.groupCurMsgSeq ?: return Response.Failed
 
-            return Response.Success(group.groupCode, seq.toLong())
+            return Response.Success(group.groupCode, seq)
         }
     }
 }

mirai-core/src/jvmBaseMain/kotlin/contact/roaming/TimeBasedRoamingMessagesImpl.kt

@@ -1,51 +0,0 @@
-/*
- * Copyright 2019-2022 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/dev/LICENSE
- */
-
-package net.mamoe.mirai.internal.contact.roaming
-
-import kotlinx.coroutines.runBlocking
-import net.mamoe.mirai.contact.roaming.RoamingMessageFilter
-import net.mamoe.mirai.internal.message.toMessageChainOnline
-import net.mamoe.mirai.message.data.MessageChain
-import net.mamoe.mirai.utils.JavaFriendlyAPI
-import net.mamoe.mirai.utils.stream
-import java.util.stream.Stream
-
-internal actual sealed class TimeBasedRoamingMessagesImpl : CommonTimeBasedRoamingMessagesImpl() {
-    @JavaFriendlyAPI
-    override suspend fun getMessagesStream(
-        timeStart: Long,
-        timeEnd: Long,
-        filter: RoamingMessageFilter?,
-    ): Stream<MessageChain> {
-        return stream {
-            var lastMessageTime = timeEnd
-            var random = 0L
-            while (true) {
-                val resp = runBlocking {
-                    requestRoamMsg(timeStart, lastMessageTime, random)
-                }
-
-                val messages = resp.messages ?: break
-                if (filter == null || filter === RoamingMessageFilter.ANY) {
-                    messages.forEach { yield(runBlocking { it.toMessageChainOnline(contact.bot) }) }
-                } else {
-                    for (message in messages) {
-                        if (filter.invoke(createRoamingMessage(message, messages))) {
-                            yield(runBlocking { message.toMessageChainOnline(contact.bot) })
-                        }
-                    }
-                }
-
-                lastMessageTime = resp.lastMessageTime
-                random = resp.random
-            }
-        }
-    }
-}

mirai-core/src/nativeMain/kotlin/contact/roaming/TimeBasedRoamingMessagesImpl.kt

@@ -1,13 +0,0 @@
-/*
- * Copyright 2019-2022 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/dev/LICENSE
- */
-
-package net.mamoe.mirai.internal.contact.roaming
-
-internal actual sealed class TimeBasedRoamingMessagesImpl actual constructor() :
-    CommonTimeBasedRoamingMessagesImpl()