Fixes for backend Golang select-multi-channel implementation.

battle_srv/Makefile

@@ -4,9 +4,24 @@ ROOT_DIR=.
 GOPROXY=https://goproxy.io
 all: help
 
+# To install `gojson` executable
+# ```
+# go install github.com/ChimeraCoder/gojson/gojson@latest
+# ```
+# 
+# OS detection reference https://stackoverflow.com/a/12099167
 gen-constants:
 	gojson -pkg common -name constants -input common/constants.json  -o common/constants_struct.go
+ifeq ($(OS),Windows_NT)
 	sed -i 's/int64/int/g' common/constants_struct.go
+else
+	UNAME_S := $(shell uname -s)
+	ifeq ($(UNAME_S),Darwin)
+		sed -i '' -e 's/int64/int/g' common/constants_struct.go
+	else
+		sed -i 's/int64/int/g' common/constants_struct.go
+	endif
+endif
 
 run-test: build
 	ServerEnv=TEST ./$(PROJECTNAME)

battle_srv/common/constants.json

@@ -44,10 +44,10 @@
     "PASSWORD_RESET_CODE_GENERATION_PER_EMAIL_TOO_FREQUENTLY": 2020,
     "TRADE_CREATION_TOO_FREQUENTLY": 2021,
     "MAP_NOT_UNLOCKED": 2022,
-
     "GET_SMS_CAPTCHA_RESP_ERROR_CODE": 2023,
     "SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY": 2024,
     "SMS_CAPTCHA_NOT_MATCH": 2025,
+    "SAME_PLAYER_ALREADY_IN_SAME_ROOM": 2026,
 
     "NOT_IMPLEMENTED_YET": 65535
   },

battle_srv/common/constants_struct.go

@@ -17,6 +17,7 @@ type constants struct {
 	RetCode struct {
 		ActiveWatchdog                                   int    `json:"ACTIVE_WATCHDOG"`
 		BattleStopped                                    int    `json:"BATTLE_STOPPED"`
+		ClientMismatchedRenderFrame                      int    `json:"CLIENT_MISMATCHED_RENDER_FRAME"`
 		Duplicated                                       int    `json:"DUPLICATED"`
 		FailedToCreate                                   int    `json:"FAILED_TO_CREATE"`
 		FailedToDelete                                   int    `json:"FAILED_TO_DELETE"`
@@ -51,6 +52,7 @@ type constants struct {
 		PlayerNotAddableToRoom                           int    `json:"PLAYER_NOT_ADDABLE_TO_ROOM"`
 		PlayerNotFound                                   int    `json:"PLAYER_NOT_FOUND"`
 		PlayerNotReaddableToRoom                         int    `json:"PLAYER_NOT_READDABLE_TO_ROOM"`
+		SamePlayerAlreadyInSameRoom                      int    `json:"SAME_PLAYER_ALREADY_IN_SAME_ROOM"`
 		SendEmailTimeout                                 int    `json:"SEND_EMAIL_TIMEOUT"`
 		SmsCaptchaNotMatch                               int    `json:"SMS_CAPTCHA_NOT_MATCH"`
 		SmsCaptchaRequestedTooFrequently                 int    `json:"SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY"`

battle_srv/go.mod

@@ -3,6 +3,7 @@ module battle_srv
 go 1.18
 
 require (
+	dnmshared v0.0.0
 	github.com/Masterminds/squirrel v0.0.0-20180815162352-8a7e65843414
 	github.com/davecgh/go-spew v1.1.1
 	github.com/gin-contrib/cors v0.0.0-20180514151808-6f0a820f94be
@@ -19,14 +20,12 @@ require (
 	github.com/thoas/go-funk v0.0.0-20180716193722-1060394a7713
 	go.uber.org/zap v1.9.1
 	google.golang.org/protobuf v1.28.1
-
-    dnmshared v0.0.0
 	jsexport v0.0.0
 	resolv v0.0.0
 )
 
 require (
-	github.com/ChimeraCoder/gojson v1.0.0 // indirect
+	github.com/ChimeraCoder/gojson v1.1.0 // indirect
 	github.com/fatih/color v1.7.0 // indirect
 	github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 // indirect
 	github.com/githubnemo/CompileDaemon v1.0.0 // indirect
@@ -44,7 +43,7 @@ require (
 	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 // indirect
 	gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 // indirect
 	gopkg.in/go-playground/validator.v8 v8.18.2 // indirect
-	gopkg.in/yaml.v2 v2.2.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
 
 replace (

battle_srv/go.sum

@@ -2,6 +2,8 @@ github.com/ByteArena/box2d v1.0.2 h1:f7f9KEQWhCs1n516DMLzi5w6u0MeeE78Mes4fWMcj9k
 github.com/ByteArena/box2d v1.0.2/go.mod h1:LzEuxY9iCz+tskfWCY3o0ywYBRafDDugdSj+/YGI6sE=
 github.com/ChimeraCoder/gojson v1.0.0 h1:gAYKGTV+xfQ4+l/4C/nazPbiQDUidG0G3ukAJnE7LNE=
 github.com/ChimeraCoder/gojson v1.0.0/go.mod h1:nYbTQlu6hv8PETM15J927yM0zGj3njIldp72UT1MqSw=
+github.com/ChimeraCoder/gojson v1.1.0 h1:/6S8djl/jColpJGTYniA3xrqJWuKeyEozzPtpr5L4Pw=
+github.com/ChimeraCoder/gojson v1.1.0/go.mod h1:nYbTQlu6hv8PETM15J927yM0zGj3njIldp72UT1MqSw=
 github.com/Masterminds/squirrel v0.0.0-20180815162352-8a7e65843414 h1:VHdYPA0V0YgL97gdjHevN6IVPRX+fOoNMqcYvUAzwNU=
 github.com/Masterminds/squirrel v0.0.0-20180815162352-8a7e65843414/go.mod h1:xnKTFzjGUiZtiOagBsfnvomW+nJg2usB1ZpordQWqNM=
 github.com/Pallinder/go-randomdata v0.0.0-20180616180521-15df0648130a h1:0OnS8GR4uI3nau+f/juCZlAq+zCrsHXRJlENrUQ4eU8=
@@ -92,3 +94,5 @@ gopkg.in/go-playground/validator.v8 v8.18.2 h1:lFB4DoMU6B626w8ny76MV7VX6W2VHct2G
 gopkg.in/go-playground/validator.v8 v8.18.2/go.mod h1:RX2a/7Ha8BgOhfk7j780h4/u/RRjR0eouCJSH80/M2Y=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

battle_srv/main.go

@@ -25,9 +25,16 @@ import (
 	"go.uber.org/zap"
 
 	"net"
+	// _ "net/http/pprof"
 )
 
 func main() {
+	/*
+		        // Only used for profiling
+			go func() {
+				http.ListenAndServe("0.0.0.0:6060", nil)
+			}()
+	*/
 	MustParseConfig()
 	MustParseConstants()
 	storage.Init()

battle_srv/models/room.go

@@ -174,16 +174,16 @@ func (pR *Room) updateScore() {
 	pR.Score = calRoomScore(pR.EffectivePlayerCount, pR.Capacity, pR.State)
 }
 
-func (pR *Room) AddPlayerIfPossible(pPlayerFromDbInit *Player, speciesId int, session *websocket.Conn, signalToCloseConnOfThisPlayer SignalToCloseConnCbType) bool {
+func (pR *Room) AddPlayerIfPossible(pPlayerFromDbInit *Player, speciesId int, session *websocket.Conn, signalToCloseConnOfThisPlayer SignalToCloseConnCbType) int {
 	playerId := pPlayerFromDbInit.Id
 	// TODO: Any thread-safety concern for accessing "pR" here?
 	if RoomBattleStateIns.IDLE != pR.State && RoomBattleStateIns.WAITING != pR.State {
 		Logger.Warn("AddPlayerIfPossible error, roomState:", zap.Any("playerId", playerId), zap.Any("roomId", pR.Id), zap.Any("roomState", pR.State), zap.Any("roomEffectivePlayerCount", pR.EffectivePlayerCount))
-		return false
+		return Constants.RetCode.PlayerNotAddableToRoom
 	}
 	if _, existent := pR.Players[playerId]; existent {
 		Logger.Warn("AddPlayerIfPossible error, existing in the room.PlayersDict:", zap.Any("playerId", playerId), zap.Any("roomId", pR.Id), zap.Any("roomState", pR.State), zap.Any("roomEffectivePlayerCount", pR.EffectivePlayerCount))
-		return false
+		return Constants.RetCode.SamePlayerAlreadyInSameRoom
 	}
 
 	defer pR.onPlayerAdded(playerId, speciesId)
@@ -210,19 +210,19 @@ func (pR *Room) AddPlayerIfPossible(pPlayerFromDbInit *Player, speciesId int, se
 	})
 	newWatchdog.Stop()
 	pR.PlayerActiveWatchdogDict[playerId] = newWatchdog
-	return true
+	return Constants.RetCode.Ok
 }
 
-func (pR *Room) ReAddPlayerIfPossible(pTmpPlayerInstance *Player, session *websocket.Conn, signalToCloseConnOfThisPlayer SignalToCloseConnCbType) bool {
+func (pR *Room) ReAddPlayerIfPossible(pTmpPlayerInstance *Player, session *websocket.Conn, signalToCloseConnOfThisPlayer SignalToCloseConnCbType) int {
 	playerId := pTmpPlayerInstance.Id
 	// TODO: Any thread-safety concern for accessing "pR" and "pEffectiveInRoomPlayerInstance" here?
 	if RoomBattleStateIns.PREPARE != pR.State && RoomBattleStateIns.WAITING != pR.State && RoomBattleStateIns.IN_BATTLE != pR.State && RoomBattleStateIns.IN_SETTLEMENT != pR.State && RoomBattleStateIns.IN_DISMISSAL != pR.State {
 		Logger.Warn("ReAddPlayerIfPossible error due to roomState:", zap.Any("playerId", playerId), zap.Any("roomId", pR.Id), zap.Any("roomState", pR.State), zap.Any("roomEffectivePlayerCount", pR.EffectivePlayerCount))
-		return false
+		return Constants.RetCode.PlayerNotReaddableToRoom
 	}
 	if _, existent := pR.Players[playerId]; !existent {
 		Logger.Warn("ReAddPlayerIfPossible error due to player nonexistent for room:", zap.Any("playerId", playerId), zap.Any("roomId", pR.Id), zap.Any("roomState", pR.State), zap.Any("roomEffectivePlayerCount", pR.EffectivePlayerCount))
-		return false
+		return Constants.RetCode.PlayerNotReaddableToRoom
 	}
 	/*
 	 * WARNING: The "pTmpPlayerInstance *Player" used here is a temporarily constructed
@@ -251,7 +251,7 @@ func (pR *Room) ReAddPlayerIfPossible(pTmpPlayerInstance *Player, session *webso
 	}) // For ReAdded player the new watchdog starts immediately
 
 	Logger.Warn("ReAddPlayerIfPossible finished.", zap.Any("roomId", pR.Id), zap.Any("playerId", playerId), zap.Any("joinIndex", pEffectiveInRoomPlayerInstance.JoinIndex), zap.Any("playerBattleState", pEffectiveInRoomPlayerInstance.BattleState), zap.Any("roomState", pR.State), zap.Any("roomEffectivePlayerCount", pR.EffectivePlayerCount), zap.Any("AckingFrameId", pEffectiveInRoomPlayerInstance.AckingFrameId), zap.Any("AckingInputFrameId", pEffectiveInRoomPlayerInstance.AckingInputFrameId), zap.Any("LastSentInputFrameId", pEffectiveInRoomPlayerInstance.LastSentInputFrameId))
-	return true
+	return Constants.RetCode.Ok
 }
 
 func (pR *Room) ChooseStage() error {
@@ -483,7 +483,7 @@ func (pR *Room) StartBattle() {
 			*/
 			totalElapsedNanos := utils.UnixtimeNano() - battleStartedAt
 			nextRenderFrameId := int32((totalElapsedNanos + pR.dilutedRollbackEstimatedDtNanos - 1) / pR.dilutedRollbackEstimatedDtNanos) // fast ceiling
-			toSleepNanos := int64(0)
+			toSleepNanos := int64(pR.dilutedRollbackEstimatedDtNanos >> 1)                                                                // Sleep half-frame time by default
 			if nextRenderFrameId > pR.RenderFrameId {
 				if 0 == pR.RenderFrameId {
 					// It's important to send kickoff frame iff  "0 == pR.RenderFrameId && nextRenderFrameId > pR.RenderFrameId", otherwise it might send duplicate kickoff frames
@@ -515,7 +515,7 @@ func (pR *Room) StartBattle() {
 				pR.LastRenderFrameIdTriggeredAt = utils.UnixtimeNano()
 
 				elapsedInCalculation := (utils.UnixtimeNano() - stCalculation)
-				toSleepNanos = pR.dilutedRollbackEstimatedDtNanos - elapsedInCalculation // don't sleep if "nextRenderFrame == pR.RenderFrameId"
+				toSleepNanos = pR.dilutedRollbackEstimatedDtNanos - elapsedInCalculation
 				if elapsedInCalculation > pR.RollbackEstimatedDtNanos {
 					Logger.Warn(fmt.Sprintf("SLOW FRAME! Elapsed time statistics: roomId=%v, room.RenderFrameId=%v, elapsedInCalculation=%v ns, dynamicsDuration=%v ns, RollbackEstimatedDtNanos=%v, dilutedRollbackEstimatedDtNanos=%v", pR.Id, pR.RenderFrameId, elapsedInCalculation, dynamicsDuration, pR.RollbackEstimatedDtNanos, pR.dilutedRollbackEstimatedDtNanos))
 				}
@@ -544,13 +544,13 @@ func (pR *Room) StartBattle() {
 			}
 
 			select {
+			// [WARNING] DON'T put a "default" block here! Otherwise "for { select {... default: } }" pattern would NEVER block on empty channel and thus consume a lot of CPU time unnecessarily!
 			case inputsBufferSnapshot := <-playerDownsyncChan:
 				pR.downsyncToSinglePlayer(playerId, player, inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, inputsBufferSnapshot.ToSendInputFrameDownsyncs, inputsBufferSnapshot.ShouldForceResync)
 				//Logger.Info(fmt.Sprintf("Sent inputsBufferSnapshot(refRenderFrameId:%d, unconfirmedMask:%v) to for (roomId: %d, playerId:%d)#2", inputsBufferSnapshot.RefRenderFrameId, inputsBufferSnapshot.UnconfirmedMask, pR.Id, playerId))
 			case inputsBufferSnapshot2 := <-playerSecondaryDownsyncChan:
 				pR.downsyncPeerInputFrameUpsyncToSinglePlayer(playerId, player, inputsBufferSnapshot2.ToSendInputFrameDownsyncs, inputsBufferSnapshot2.PeerJoinIndex)
 				//Logger.Info(fmt.Sprintf("Sent secondary inputsBufferSnapshot to for (roomId: %d, playerId:%d)#2", pR.Id, playerId))
-			default:
 			}
 		}
 	}

battle_srv/ws/serve.go

@@ -188,34 +188,33 @@ func Serve(c *gin.Context) {
 	}()
 	Logger.Debug("Acquired RoomHeapMux for player:", zap.Any("playerId", playerId))
 	// Logger.Info("The RoomHeapManagerIns has:", zap.Any("addr", fmt.Sprintf("%p", models.RoomHeapManagerIns)), zap.Any("size", len(*(models.RoomHeapManagerIns))))
-	playerSuccessfullyAddedToRoom := false
+	playerRoomRelation := Constants.RetCode.UnknownError
 	if 0 < boundRoomId {
 		if tmpPRoom, existent := (*models.RoomMapManagerIns)[int32(boundRoomId)]; existent {
 			pRoom = tmpPRoom
-			res := pRoom.ReAddPlayerIfPossible(pPlayer, conn, signalToCloseConnOfThisPlayer)
-			if !res {
+			playerRoomRelation = pRoom.ReAddPlayerIfPossible(pPlayer, conn, signalToCloseConnOfThisPlayer)
+			if Constants.RetCode.Ok != playerRoomRelation {
 				Logger.Warn("Failed to get:\n", zap.Any("roomId", pRoom.Id), zap.Any("playerId", playerId), zap.Any("forBoundRoomId", boundRoomId))
-			} else {
-				playerSuccessfullyAddedToRoom = true
 			}
 		}
 	} else if 0 < expectedRoomId {
 		if tmpRoom, existent := (*models.RoomMapManagerIns)[int32(expectedRoomId)]; existent {
 			pRoom = tmpRoom
-
-			if pRoom.ReAddPlayerIfPossible(pPlayer, conn, signalToCloseConnOfThisPlayer) {
-				playerSuccessfullyAddedToRoom = true
-			} else if pRoom.AddPlayerIfPossible(pPlayer, speciesId, conn, signalToCloseConnOfThisPlayer) {
-				playerSuccessfullyAddedToRoom = true
-			} else {
+			playerRoomRelation = pRoom.ReAddPlayerIfPossible(pPlayer, conn, signalToCloseConnOfThisPlayer)
+			if Constants.RetCode.Ok != playerRoomRelation {
+				playerRoomRelation = pRoom.AddPlayerIfPossible(pPlayer, speciesId, conn, signalToCloseConnOfThisPlayer)
+			}
+			if Constants.RetCode.Ok != playerRoomRelation {
 				Logger.Warn("Failed to get:\n", zap.Any("roomId", pRoom.Id), zap.Any("playerId", playerId), zap.Any("forExpectedRoomId", expectedRoomId))
-				playerSuccessfullyAddedToRoom = false
 			}
-
 		}
 	}
 
-	if false == playerSuccessfullyAddedToRoom {
+	if Constants.RetCode.SamePlayerAlreadyInSameRoom == playerRoomRelation {
+		signalToCloseConnOfThisPlayer(playerRoomRelation, fmt.Sprintf("playerId == %v is already in a room, this account is possibly stolen!", playerId))
+	}
+
+	if Constants.RetCode.Ok != playerRoomRelation {
 		defer func() {
 			if pRoom != nil {
 				heap.Push(models.RoomHeapManagerIns, pRoom)
@@ -229,9 +228,9 @@ func Serve(c *gin.Context) {
 		} else {
 			pRoom = tmpRoom
 			Logger.Info("Successfully popped:\n", zap.Any("roomId", pRoom.Id), zap.Any("forPlayerId", playerId))
-			res := pRoom.AddPlayerIfPossible(pPlayer, speciesId, conn, signalToCloseConnOfThisPlayer)
-			if !res {
-				signalToCloseConnOfThisPlayer(Constants.RetCode.PlayerNotAddableToRoom, fmt.Sprintf("AddPlayerIfPossible returns false for roomId == %v, playerId == %v!", pRoom.Id, playerId))
+			playerRoomRelation = pRoom.AddPlayerIfPossible(pPlayer, speciesId, conn, signalToCloseConnOfThisPlayer)
+			if Constants.RetCode.Ok != playerRoomRelation {
+				signalToCloseConnOfThisPlayer(playerRoomRelation, fmt.Sprintf("AddPlayerIfPossible returns false for roomId == %v, playerId == %v!", pRoom.Id, playerId))
 			}
 		}
 	}

frontend/assets/plugin_scripts/constants.js

@@ -109,6 +109,7 @@ var constants = {
     "GET_SMS_CAPTCHA_RESP_ERROR_CODE": 2023,
     "SMS_CAPTCHA_REQUESTED_TOO_FREQUENTLY": 2024,
     "SMS_CAPTCHA_NOT_MATCH": 2025,
+    "SAME_PLAYER_ALREADY_IN_SAME_ROOM": 2026,
 
     "NOT_IMPLEMENTED_YET": 65535
   },

frontend/assets/resources/map/dungeon/map.tmx

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<map version="1.2" tiledversion="1.2.3" orientation="orthogonal" renderorder="right-down" width="128" height="40" tilewidth="16" tileheight="16" infinite="0" nextlayerid="8" nextobjectid="138">
+<map version="1.2" tiledversion="1.2.3" orientation="orthogonal" renderorder="right-down" width="128" height="64" tilewidth="16" tileheight="16" infinite="0" nextlayerid="9" nextobjectid="138">
  <tileset firstgid="1" source="tiles0.tsx"/>
  <tileset firstgid="65" source="tiles1.tsx"/>
  <tileset firstgid="129" source="tiles2.tsx"/>
- <layer id="7" name="Ground" width="128" height="40">
+ <layer id="8" name="Ground" width="128" height="64">
   <data encoding="base64" compression="zlib">
-   eJzt2k0OgjAQQGECccMOo+5JvIlx484LeP9jaAxNSEOhlMGZOG/xbfyl81rc2FRV1QAAAAAAAAAAAADAD9zxpd1Bs7/2NWjzPAPPa2cGvtfODHyvnRn4XjszKFv7KdOW6zoKvYb+9vpf6W+G5f5zfZeep7/82kM3qf6Hj25C3DhFYwb/pqT/VlKfQ///7z91f+g2fj/9y/tLWbqfp7rvsQ/ob0tue6l9YHEGlvv3Qq+hv77x2tuBdv/SPVC6P7z3v0XCc/HjQZ8p9X5rwgy0W2j1rwfh/L8+Hgm1gNQZlfjsku/2fv7j/uPfgPFjUv010T/d/xH1niLd47KDNfcc+s/3aRdml2Opv/R+ov+6/ufB3Ny2nP+5PbD3+c/Zn/RP95f8zaW/Pdr/u7ZCu4Nm/6dz9Pdtz/5vZSq2hg==
+   eJzt2j1uwkAQgFEESkNHlKRHyk2iNHRcIPc/RlCEJWSxtrHHmRX7itfw651v1zTsNpvNDgAAAAAAAOAffPMnu0Nm/+xryNbyDFpeuxm0vXYzaHvtZtD22s1g3trfJlpyXa9Br9G/vv6f+lej5v5Dfcee1z9+7V23qP4vF4c7+o1LMmbwbOb0Xyrqc/R//v737g+Hhd+v//z+Ucbu56Xua+wD/esytX3UPqhxBjX3Pwa9Rv98t2vfX2X3n7sH5u6P1vt/9XTP9R/vHCcqvb823QyyW2T131515//n4lSwDVA6oxGfPee7Wz///f63vwG3j0X1z6R/uf+p1/ue6B4fK3jknqP/cJ/9yOymGOsfvZ/0f6z/+9XQ3Jac/6E9sPb5n7I/9S/3j/zN1b8+2f+7rkV2h8z+58bp37Y1+x8qlz37WmR30F9//fXXX38AAAAAAAAAAAAg1y8jXMSV
   </data>
  </layer>
  <objectgroup id="1" name="PlayerStartingPos">

frontend/assets/resources/prefabs/FindingPlayer.prefab

@@ -22,6 +22,9 @@
       },
       {
         "__id__": 5
+      },
+      {
+        "__id__": 11
       }
     ],
     "_active": true,
@@ -192,102 +195,28 @@
     "fileId": "ab6G+s0otA4rXhUsO3czRN",
     "sync": false
   },
-  {
-    "__type__": "cc.Node",
-    "_name": "VerticalLayout",
-    "_objFlags": 0,
-    "_parent": {
-      "__id__": 1
-    },
-    "_children": [
-      {
-        "__id__": 6
-      },
-      {
-        "__id__": 12
-      }
-    ],
-    "_active": true,
-    "_components": [
-      {
-        "__id__": 53
-      },
-      {
-        "__id__": 54
-      }
-    ],
-    "_prefab": {
-      "__id__": 55
-    },
-    "_opacity": 255,
-    "_color": {
-      "__type__": "cc.Color",
-      "r": 255,
-      "g": 255,
-      "b": 255,
-      "a": 255
-    },
-    "_contentSize": {
-      "__type__": "cc.Size",
-      "width": 960,
-      "height": 265
-    },
-    "_anchorPoint": {
-      "__type__": "cc.Vec2",
-      "x": 0.5,
-      "y": 0.5
-    },
-    "_trs": {
-      "__type__": "TypedArray",
-      "ctor": "Float64Array",
-      "array": [
-        0,
-        -9.924,
-        0,
-        0,
-        0,
-        0,
-        1,
-        1,
-        1,
-        1
-      ]
-    },
-    "_eulerAngles": {
-      "__type__": "cc.Vec3",
-      "x": 0,
-      "y": 0,
-      "z": 0
-    },
-    "_skewX": 0,
-    "_skewY": 0,
-    "_is3DNode": false,
-    "_groupIndex": 0,
-    "groupIndex": 0,
-    "_id": ""
-  },
   {
     "__type__": "cc.Node",
     "_name": "exitButton",
     "_objFlags": 0,
     "_parent": {
-      "__id__": 5
+      "__id__": 1
     },
     "_children": [],
     "_active": true,
     "_components": [
+      {
+        "__id__": 6
+      },
       {
         "__id__": 7
       },
       {
-        "__id__": 8
-      },
-      {
-        "__id__": 10
+        "__id__": 9
       }
     ],
     "_prefab": {
-      "__id__": 11
+      "__id__": 10
     },
     "_opacity": 255,
     "_color": {
@@ -312,7 +241,7 @@
       "ctor": "Float64Array",
       "array": [
         -379.577,
-        100.5,
+        90.576,
         0,
         0,
         0,
@@ -341,7 +270,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 6
+      "__id__": 5
     },
     "_enabled": true,
     "_materials": [
@@ -375,7 +304,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 6
+      "__id__": 5
     },
     "_enabled": true,
     "_normalMaterial": null,
@@ -384,7 +313,7 @@
     "zoomScale": 1.2,
     "clickEvents": [
       {
-        "__id__": 9
+        "__id__": 8
       }
     ],
     "_N$interactable": true,
@@ -440,7 +369,7 @@
     "hoverSprite": null,
     "_N$disabledSprite": null,
     "_N$target": {
-      "__id__": 6
+      "__id__": 5
     },
     "_id": ""
   },
@@ -459,7 +388,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 6
+      "__id__": 5
     },
     "_enabled": true,
     "alignMode": 1,
@@ -489,15 +418,86 @@
     "asset": {
       "__uuid__": "dc804c5c-ff76-445e-ac69-52269055c3c5"
     },
-    "fileId": "1cUg34ZtdK9JfdGIG+lpdF",
+    "fileId": "3cdlb7LxhMzLDzxdQv8Z/x",
     "sync": false
   },
+  {
+    "__type__": "cc.Node",
+    "_name": "VerticalLayout",
+    "_objFlags": 0,
+    "_parent": {
+      "__id__": 1
+    },
+    "_children": [
+      {
+        "__id__": 12
+      }
+    ],
+    "_active": true,
+    "_components": [
+      {
+        "__id__": 53
+      },
+      {
+        "__id__": 54
+      }
+    ],
+    "_prefab": {
+      "__id__": 55
+    },
+    "_opacity": 255,
+    "_color": {
+      "__type__": "cc.Color",
+      "r": 255,
+      "g": 255,
+      "b": 255,
+      "a": 255
+    },
+    "_contentSize": {
+      "__type__": "cc.Size",
+      "width": 960,
+      "height": 137
+    },
+    "_anchorPoint": {
+      "__type__": "cc.Vec2",
+      "x": 0.5,
+      "y": 0.5
+    },
+    "_trs": {
+      "__type__": "TypedArray",
+      "ctor": "Float64Array",
+      "array": [
+        0,
+        -68.939,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        1,
+        1
+      ]
+    },
+    "_eulerAngles": {
+      "__type__": "cc.Vec3",
+      "x": 0,
+      "y": 0,
+      "z": 0
+    },
+    "_skewX": 0,
+    "_skewY": 0,
+    "_is3DNode": false,
+    "_groupIndex": 0,
+    "groupIndex": 0,
+    "_id": ""
+  },
   {
     "__type__": "cc.Node",
     "_name": "HorizontalLayout",
     "_objFlags": 0,
     "_parent": {
-      "__id__": 5
+      "__id__": 11
     },
     "_children": [
       {
@@ -545,7 +545,7 @@
       "ctor": "Float64Array",
       "array": [
         0,
-        -64,
+        0,
         0,
         0,
         0,
@@ -1953,7 +1953,7 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 5
+      "__id__": 11
     },
     "_enabled": true,
     "_materials": [
@@ -1983,13 +1983,13 @@
     "_name": "",
     "_objFlags": 0,
     "node": {
-      "__id__": 5
+      "__id__": 11
     },
     "_enabled": true,
     "_layoutSize": {
       "__type__": "cc.Size",
       "width": 960,
-      "height": 265
+      "height": 137
     },
     "_resize": 1,
     "_N$layoutType": 2,
@@ -2040,7 +2040,7 @@
       "__id__": 43
     },
     "exitBtnNode": {
-      "__id__": 6
+      "__id__": 5
     },
     "_id": ""
   },

frontend/assets/scenes/default_map.fire

@@ -536,7 +536,7 @@
       "array": [
         0,
         0,
-        216.65450766436658,
+        216.05530045313827,
         0,
         0,
         0,

frontend/assets/scenes/login.fire

@@ -461,7 +461,7 @@
       "array": [
         0,
         0,
-        209.66956379694378,
+        210.43877906529718,
         0,
         0,
         0,

frontend/assets/scripts/Map.js

@@ -293,7 +293,7 @@ cc.Class({
     }
   },
 
-  popupSimplePressToGo(labelString, hideYesButton) {
+  popupSimplePressToGo(labelString, hideYesButton, additionalOnDismissalCb) {
     const self = this;
     self.state = ALL_MAP_STATES.SHOWING_MODAL_POPUP;
 
@@ -306,6 +306,9 @@ cc.Class({
     const postDismissalByYes = () => {
       self.transitToState(ALL_MAP_STATES.VISUAL);
       canvasNode.removeChild(simplePressToGoDialogNode);
+      if (additionalOnDismissalCb) {
+        additionalOnDismissalCb();
+      }
     }
     simplePressToGoDialogNode.getChildByName("Hint").getComponent(cc.Label).string = labelString;
     yesButton.once("click", simplePressToGoDialogScriptIns.dismissDialog.bind(simplePressToGoDialogScriptIns, postDismissalByYes));

frontend/assets/scripts/WsSessionMgr.js

@@ -288,13 +288,21 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {
 `);
         }
         break;
+      case constants.RET_CODE.SAME_PLAYER_ALREADY_IN_SAME_ROOM:
+        mapIns.popupSimplePressToGo("You just logged into a conflicting account, please use a different account to retry", false, () => {
+          window.clearLocalStorageAndBackToLoginScene(true);
+        });
+        break;
       case constants.RET_CODE.PLAYER_NOT_ADDABLE_TO_ROOM:
       case constants.RET_CODE.PLAYER_NOT_READDABLE_TO_ROOM:
-        window.clearBoundRoomIdInBothVolatileAndPersistentStorage(); // To favor the player to join other rooms
-        mapIns.onManualRejoinRequired("Couldn't join any room at the moment, please retry");
+        mapIns.popupSimplePressToGo("Couldn't join any room at the moment, please retry", false, () => {
+          window.clearLocalStorageAndBackToLoginScene(true);
+        });
         break;
       case constants.RET_CODE.ACTIVE_WATCHDOG:
-        mapIns.onManualRejoinRequired("Disconnected due to long-time inactivity, please rejoin");
+        mapIns.popupSimplePressToGo("Couldn't join any room at the moment, please retry", false, () => {
+          window.clearLocalStorageAndBackToLoginScene(true);
+        });
         break;
       case constants.RET_CODE.UNKNOWN_ERROR:
       case constants.RET_CODE.MYSQL_ERROR:
@@ -305,9 +313,19 @@ window.initPersistentSessionClient = function(onopenCb, expectedRoomId) {
           console.warn(`${mapIns._stringifyRdfIdToActuallyUsedInput()}
 `);
         }
+        mapIns.popupSimplePressToGo("Disconnected unexpectedly, please retry", false, () => {
           window.clearLocalStorageAndBackToLoginScene(true);
-        break;
+        });
       default:
+        if (cc.sys.isNative) {
+          // [WARNING] This could be a BUG in CocosCreator JSB implementation of WebSocket client, the "evt.code" is always "undefined" in the "onclose" callback!
+          if (window.ALL_BATTLE_STATES.IN_SETTLEMENT != mapIns.battleState && window.ALL_BATTLE_STATES.IN_DISMISSAL != mapIns.battleState) {
+
+            mapIns.popupSimplePressToGo("Disconnected unexpectedly, please retry", false, () => {
+              window.clearLocalStorageAndBackToLoginScene(true);
+            });
+          }
+        }
         break;
     }
   };

frontend/build-templates/jsb-link/frameworks/runtime-src/Classes/ring_buff.cpp

@@ -32,20 +32,43 @@ SendWork* SendRingBuff::pop() {
 }
 
 // Recving
+bool isFullWithLoadedVals(int n, int oldCnt, int oldSt, int oldEd) {
+    return (n <= oldCnt && oldEd == oldSt) || (n > oldCnt && 0 < oldCnt && oldEd == oldSt); 
+}
+
 void RecvRingBuff::put(char* newBytes, size_t newBytesLen) {
     RecvWork* slotEle = (&eles[ed.load()]); // Save for later update
 
+    // "RecvRingBuff.ed" is only accessed in "UvRecvThread", thus the order of it relative to the other two is not important.
+    int oldEd = ed.load();
+
+    // We want to increase the success rate of "pop()" if it's being executed by "GameThread/pollUdpRecvRingBuff", thus the below order of loading is IMPORTANT, i.e. load "cnt" first because it's decremented earlier than "st" being incremented.
     int oldCnt = cnt.load();
+    /*
+    [WARNING]
+    
+    Note that "RecvRingBuff.st" might have decremented in "GameThread" by a successful "pop()" between "cnt.load()" and "st.load()" here in "UvRecvThread"! Therefore "n <= oldCnt" doesn't necessarily imply "oldEd == oldSt"!
+    */
     int oldSt = st.load(); // Used to guard against "cnt decremented in pop(...), but st not yet incremented and thus return value not yet copied to avoid contamination"
     int tried = 0;
-    while (n <= oldCnt && !ed.compare_exchange_weak(oldSt, oldSt) && 3 > tried) {
+    /*
+    1. When "n <= oldCnt", it might still be true "oldEd != oldSt" (see the note above); 
+    2. When "n > oldCnt", it might still be true that "oldEd == oldSt" if "pop()" hasn't successfully incremented "st" due to any reason; 
+    3. When "oldEd == oldSt", it doesn't imply anything useful, because any of the following could be true 
+        - a. "n <= oldCnt", i.e. the ringbuff is full 
+        - b. "n > oldCnt && 0 < oldCnt" during the execution of "pop()", i.e. the ringbuff is still effectively full
+        - c. "n > oldCnt && 0 == oldCnt", i.e. the ringbuff is empty
+    */
+    bool isFull = isFullWithLoadedVals(n, oldCnt, oldSt, oldEd); 
+    while (isFull && 3 > tried) {
         // Make room for the new element
         this->pop(NULL);
         oldCnt = cnt.load(); // If "pop()" above failed, it'd only be due to concurrent calls to "pop()", either way the updated "cnt" should be good to go
         oldSt = st.load();
+        isFull = isFullWithLoadedVals(n, oldCnt, oldSt, oldEd); 
         ++tried;
     }
-    if (n <= oldCnt && !ed.compare_exchange_weak(oldSt, oldSt) && 3 == tried) {
+    if (isFull && 3 == tried) {
         // Failed silently, UDP packet can be dropped.
         return;
     }
@@ -56,11 +79,13 @@ void RecvRingBuff::put(char* newBytes, size_t newBytesLen) {
     }
 
     // No need to compare-and-swap, only "UvRecvThread" will access "RecvRingBuff.ed".
-    ed++;
-    if (ed >= n) {
-        ed -= n; // Deliberately not using "%" operator for performance concern
+    int newEd = oldEd+1;
+    if (newEd >= n) {
+        newEd -= n; // Deliberately not using "%" operator for performance concern
     }
 
+    ed.compare_exchange_weak(oldEd, newEd); // Definitely succeeds because "RecvRingBuff.ed" is only accessed in "UvRecvThread" 
+
     // Only increment cnt when the putting of new element is fully done.
     cnt++;
 }

frontend/build-templates/jsb-link/frameworks/runtime-src/Classes/udp_session.cpp

@@ -160,7 +160,6 @@ void startRecvLoop(void* arg) {
 
     int uvCloseRet = uv_loop_close(l);
     CCLOG("UDP recv loop is closed in UvRecvThread, uvCloseRet=%d", uvCloseRet);
-    uv_mutex_destroy(&recvRingBuffLock);
 }
 
 void startSendLoop(void* arg) {
@@ -174,7 +173,6 @@ void startSendLoop(void* arg) {
 
     int uvCloseRet = uv_loop_close(l);
     CCLOG("UDP send loop is closed in UvSendThread, uvCloseRet=%d", uvCloseRet);
-    uv_mutex_destroy(&sendRingBuffLock);
 }
 
 int initSendLoop(struct sockaddr const* pUdpAddr) {
@@ -189,9 +187,6 @@ int initSendLoop(struct sockaddr const* pUdpAddr) {
     uv_mutex_init(&sendRingBuffLock);
     sendRingBuff = new SendRingBuff(maxBuffedMsgs);
 
-    uv_mutex_init(&recvRingBuffLock);
-    recvRingBuff = new RecvRingBuff(maxBuffedMsgs);
-
     uv_async_init(sendLoop, &uvSendLoopStopSig, _onUvStopSig);
     uv_async_init(sendLoop, &uvSendLoopTriggerSig, _onUvSthNewToSend);
 
@@ -208,6 +203,9 @@ bool initRecvLoop(struct sockaddr const* pUdpAddr) {
         CCLOGERROR("Failed to bind recv; recvSockInitRes=%d, recvbindRes=%d, reason=%s", recvSockInitRes, recvbindRes, uv_strerror(recvbindRes));
         exit(-1);
     }
+    uv_mutex_init(&recvRingBuffLock);
+    recvRingBuff = new RecvRingBuff(maxBuffedMsgs);
+
     uv_udp_recv_start(udpRecvSocket, _allocBuffer, _onRead);
     uv_async_init(recvLoop, &uvRecvLoopStopSig, _onUvStopSig);
 
@@ -249,6 +247,12 @@ bool DelayNoMore::UdpSession::openUdpSession(int port) {
 bool DelayNoMore::UdpSession::closeUdpSession() {
     CCLOG("About to close udp session and dealloc all resources...");
     
+    /*
+    [WARNING] It's possible that "closeUdpSession" is called when "openUdpSession" was NEVER CALLED, thus we have to avoid program crash in this case.  
+
+    In general one shouldn't just check the state of "sendTid" by whether or not "NULL == sendLoop", but in this particular game, both "openUdpSession" and "closeUdpSession" are only called from "GameThread", no thread-safety concern here, i.e. if "openUdpSession" was ever called earlier, then "sendLoop" wouldn't be NULL when "closeUdpSession" is later called.
+    */
+    if (NULL != sendLoop) {
         uv_async_send(&uvSendLoopStopSig);
         CCLOG("Signaling UvSendThread to end in GameThread...");
         uv_thread_join(&sendTid);
@@ -256,6 +260,14 @@ bool DelayNoMore::UdpSession::closeUdpSession() {
         free(sendLoop);
         delete sendRingBuff;
         
+        udpSendSocket = NULL;
+        sendLoop = NULL;
+        sendRingBuff = NULL;
+
+        uv_mutex_destroy(&sendRingBuffLock);
+    }
+
+    if (NULL != recvLoop) {
         uv_async_send(&uvRecvLoopStopSig); // The few if not only guaranteed thread safe utility of libuv :) See http://docs.libuv.org/en/v1.x/async.html#c.uv_async_send
         CCLOG("Signaling UvRecvThread to end in GameThread...");
         uv_thread_join(&recvTid);
@@ -263,6 +275,13 @@ bool DelayNoMore::UdpSession::closeUdpSession() {
         free(recvLoop);
         delete recvRingBuff;
 
+        udpRecvSocket = NULL;
+        recvLoop = NULL;
+        recvRingBuff = NULL;
+
+        uv_mutex_destroy(&recvRingBuffLock);
+    }
+
     CCLOG("Closed udp session and dealloc all resources in GameThread...");
 
     return true;
@@ -356,8 +375,10 @@ bool DelayNoMore::UdpSession::pollUdpRecvRingBuff() {
     while (true) {
         RecvWork f;
         bool res = recvRingBuff->pop(&f); 
-        if (!res) return false;
-
+        if (!res) {
+            // Deliberately returning "true" here to prevent "jswrapper" from printing "Failed to invoke Xxx..." too frequently
+            return true;
+        }
         // [WARNING] Declaring "AutoHandleScope" is critical here, otherwise "onUdpMessageCb.toObject()" wouldn't be recognized as a function of the ScriptEngine!
         se::AutoHandleScope hs;
         // [WARNING] Use of the "ScriptEngine" is only allowed in "GameThread a.k.a. CocosThread"!

jsexport/battle/battle.go

@@ -698,6 +698,8 @@ func ApplyInputFrameDownsyncDynamicsOnSingleRenderFrame(inputsBuffer *resolv.Rin
 				} else if stoppingFromWalking {
 					thatPlayerInNextFrame.FramesToRecover = chConfig.InertiaFramesToRecover
 				} else {
+					// Updates CharacterState and thus the animation to make user see graphical feedback asap.
+					thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_WALKING
 					thatPlayerInNextFrame.FramesToRecover = ((chConfig.InertiaFramesToRecover >> 1) + (chConfig.InertiaFramesToRecover >> 2))
 				}
 			} else {
@@ -959,6 +961,8 @@ func ApplyInputFrameDownsyncDynamicsOnSingleRenderFrame(inputsBuffer *resolv.Rin
 				thatPlayerInNextFrame.VelY = 0
 				thatPlayerInNextFrame.VelX = 0
 				if ATK_CHARACTER_STATE_DYING == thatPlayerInNextFrame.CharacterState {
+
+					// No update needed for Dying
 				} else if ATK_CHARACTER_STATE_BLOWN_UP1 == thatPlayerInNextFrame.CharacterState {
 					thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_LAY_DOWN1
 					thatPlayerInNextFrame.FramesToRecover = chConfig.LayDownFramesToRecover
@@ -977,7 +981,8 @@ func ApplyInputFrameDownsyncDynamicsOnSingleRenderFrame(inputsBuffer *resolv.Rin
 				// landedOnGravityPushback not fallStopping, could be in LayDown or GetUp or Dying
 				if _, existent := nonAttackingSet[thatPlayerInNextFrame.CharacterState]; existent {
 					if ATK_CHARACTER_STATE_DYING == thatPlayerInNextFrame.CharacterState {
-						// No update needed for Dying
+						thatPlayerInNextFrame.VelY = 0
+						thatPlayerInNextFrame.VelX = 0
 					} else if ATK_CHARACTER_STATE_LAY_DOWN1 == thatPlayerInNextFrame.CharacterState {
 						if 0 == thatPlayerInNextFrame.FramesToRecover {
 							thatPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_GET_UP1
@@ -1074,15 +1079,15 @@ func ApplyInputFrameDownsyncDynamicsOnSingleRenderFrame(inputsBuffer *resolv.Rin
 				}
 				atkedPlayerInNextFrame := nextRenderFramePlayers[t.JoinIndex-1]
 				atkedPlayerInNextFrame.Hp -= bulletStaticAttr.Damage
+				pushbackVelX, pushbackVelY := xfac*bulletStaticAttr.PushbackVelX, bulletStaticAttr.PushbackVelY
+				atkedPlayerInNextFrame.VelX = pushbackVelX
+				atkedPlayerInNextFrame.VelY = pushbackVelY
 				if 0 >= atkedPlayerInNextFrame.Hp {
 					// [WARNING] We don't have "dying in air" animation for now, and for better graphical recognition, play the same dying animation even in air
 					atkedPlayerInNextFrame.Hp = 0
 					atkedPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_DYING
 					atkedPlayerInNextFrame.FramesToRecover = DYING_FRAMES_TO_RECOVER
 				} else {
-					pushbackVelX, pushbackVelY := xfac*bulletStaticAttr.PushbackVelX, bulletStaticAttr.PushbackVelY
-					atkedPlayerInNextFrame.VelX = pushbackVelX
-					atkedPlayerInNextFrame.VelY = pushbackVelY
 					if bulletStaticAttr.BlowUp {
 						atkedPlayerInNextFrame.CharacterState = ATK_CHARACTER_STATE_BLOWN_UP1
 					} else {