client.py

import socket
import struct
import select
import time
import json
import traceback
import math

from PluginManager import *
from valorlib.Packets.Packet import *
from valorlib.RC4 import RC4
from valorlib.Packets.DataStructures import SlotObjectData, WorldPosData

class Client:
	""" 
	This class holds all data relevant to clients. 
	in here, we will also put the sockets. this allows the client class to send and receive packets
	from a design persepctive, this also makes sense since this can scale to clientless by just removing server -> client socket
	"""

	def __init__(self, pm: PluginManager, bullets: dict, names: dict, tiles: dict, aoes: dict):

		# some parameters used throught the game
		self.remoteHostAddr = "51.222.11.213"
		self.remoteHostPort = 2050
		self.objectID = None
		self.charID = None
		self.objectID = None
		self.clientSendKey = RC4(bytearray.fromhex("BA15DE"))
		self.clientReceiveKey = RC4(bytearray.fromhex("612a806cac78114ba5013cb531"))
		self.serverSendKey = RC4(bytearray.fromhex("612a806cac78114ba5013cb531"))
		self.serverReceiveKey = RC4(bytearray.fromhex("BA15DE"))
		self.currentMap = "None"
		self.gameIDs = {
			-1 : "Nexus",
			-2 : "Nexus",
			-5 : "Vault",
			-15 : "Marketplace",
			-16 : "Ascension Enclave",
			-17 : "Aspect Hall"
		}
		# key objectType, value potion ID
		self.potionStorageID = {
			2793: 0, 2794: 1, 2591: 2, 2592: 3,
			2593: 4, 2636: 5, 2612: 6, 2613: 7,
			22562: 8, 22563: 9, 26877: 10, 26878: 11,
			9070: 0, 9071: 1, 9064: 2, 9065: 3, 
			9066: 4, 9069: 5, 9067: 6, 9068: 7,
			25033: 8, 25035: 9, 25034: 10, 25036: 11
		}

		# variables we use to keep track of client's state
		self.reconnecting = False
		self.connected = False
		self.gameSocket = None
		self.serverSocket = None
		self.pluginManager = pm

		# stuff to ignore when debugging
		#self.ignoreIn = []
		#self.ignoreOut = []
		self.ignoreOut = [PacketTypes.UpdateAck, PacketTypes.Move, PacketTypes.Pong, PacketTypes.GotoAck, PacketTypes.PlayerShoot, PacketTypes.ShootAck]
		self.ignoreIn = [PacketTypes.Ping, PacketTypes.Goto, PacketTypes.Update, PacketTypes.NewTick]
		self.screenshotMode = False

		# client state syncs, these are public
		self.disableSpeedy = False
		self.disableSwiftness = False
		

		##################
		# game variables #
		##################
		# current and prev location
		self.lastx = 0
		self.lasty = 0
		self.currentx = 0
		self.currenty = 0
		self.currentpos = 0
		# bitfields to represent our conditions
		self.effect0bits = 0
		self.effect1bits = 0
		self.effect2bits = 0
		self.latestQuest = None

		### AutoNexus variables ###
		self.currentHP = None
		self.maxHP = None
		self.currentProtection = None
		self.defense = 0
		# key objectType, value name
		self.enemyName = names
		# key (x, y), value id
		self.newTiles = {}
		# key id, value (min, max dmg)
		self.tileDictionary = tiles
		# key id, value ObjectInfo (pos, objectType)
		self.newObjects = {}
		# bullets we have seen being shot by enemies
		# key objectID, value below
			# key bullet ID, value BulletInfo (bullet type, damage)
		self.seenProjectiles = {}
		# bullet info parsed from XMLs. example:
		# (28795, 0): {'damage': 125, 'conditionEffect': 'Quiet', 'armorPiercing': False}
		self.bulletDictionary = bullets
		self.aoeDictionary = aoes
		# signal to tell proxy to connect to nexus
		self.reconnectToNexus = False

		self.blockAbilityUse = False

		# inventory model
		self.inventoryModel = [-1 for _ in range(16)]
		
		
	# disconnect the client from the proxy
	# disconnect the proxy from the server
	def Disconnect(self):
		self.connected = False
		if self.serverSocket:
			self.serverSocket.shutdown(socket.SHUT_RDWR)
			self.serverSocket.close()
		if self.gameSocket:
			self.gameSocket.shutdown(socket.SHUT_RDWR)
			self.gameSocket.close()
		self.gameSocket = None
		self.serverSocket = None

	# reset ciphers to default state
	def ResetCipher(self):
		self.clientSendKey.reset()
		self.clientReceiveKey.reset()
		self.serverSendKey.reset()
		self.serverReceiveKey.reset()

	# we can just recon lazily as Valor has a static ip for all instances
	def Reconnect(self):
		self.ConnectRemote(self.remoteHostAddr, self.remoteHostPort)
		self.connected = True

	# Connect to remote host. Block until client connected
	def ConnectRemote(self, host, port):
		while self.gameSocket == None:
			time.sleep(0.005)

		self.serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		self.serverSocket.connect((host, port))

	# closes both sockets
	def Close(self):
		self.gameSocket.close()
		self.serverSocket.close()

	def ResetStateSyncs(self):

		self.lastx = 0
		self.lasty = 0
		self.currentx = 0
		self.currenty = 0
		self.currentpos = 0

		self.latestQuest = None

		self.inventoryModel = [-1 for _ in range(16)]

		self.currentHP = None
		self.maxHP = None
		self.currentProtection = None
		self.defense = 0
		self.objectType = 0
		self.newTiles = {}
		self.newObjects = {}
		self.seenProjectiles = {}
		self.reconnectToNexus = False

	# restart entire connection
	def reset(self):
		self.ResetStateSyncs()
		self.Disconnect()
		self.ResetCipher()
		self.Reconnect()

	# call this fcn when you reset connection
	def resetMapName(self):
		self.currentMap = "Nexus"

	# tell client to nexus after finishing the read on the current packet
	def FireNexusSignal(self):
		self.reconnectToNexus = True
		self.reconnecting = True

	"""
	Listens to packets from the client.
	"""
	def ListenToClient(self):

		header = self.gameSocket.recv(5)

		if len(header) == 0 or self.reconnecting:
			self.reset()
			return

		# let's see if this prevents indexerror
		leftToRead = 5 - len(header)
		while len(header) < 5:
			header += self.gameSocket.recv(leftToRead)
			leftToRead -= len(header)
			print("ListenToServer: Triggered header reread")
		
		packetID = header[4]
		expectedPacketLength = struct.unpack("!i", header[:4])[0]

		# read the packet, subtract 5 cuz you already read header
		leftToRead = expectedPacketLength - 5
		data = bytearray()

		while (leftToRead > 0): 
			buf = bytearray(self.gameSocket.recv(leftToRead))
			data += buf
			leftToRead -= len(buf)

		# decipher it to update our internal state
		self.clientSendKey.decrypt(data)
		packet = Packet(header, data, packetID)		
		send = True

		"""
		# for debugging
		try:
			if packet.ID not in self.ignoreOut:
				print("Client sent:", PacketTypes.reverseDict[packet.ID])
		except:
			print("Got unknown packet from client")
		"""

		# hooks
		if packet.ID == PacketTypes.Hello:
			packet, send = self.routePacket(packet, send, self.onHello)

		# plugin management
		elif packet.ID == PacketTypes.PlayerHit:
			packet, send = self.routePacket(packet, send, self.onPlayerHit)

		elif packet.ID == PacketTypes.GroundDamage:	
			packet, send = self.routePacket(packet, send, self.onGroundDamage)

		elif packet.ID == PacketTypes.EnemyHit:
			packet, send = self.routePacket(packet, send, self.onEnemyHit)

		elif packet.ID == PacketTypes.PlayerText:
			packet, send = self.routePacket(packet, send, self.onPlayerText)

		elif packet.ID == PacketTypes.PlayerShoot:
			packet, send = self.routePacket(packet, send, self.onPlayerShoot)

		elif packet.ID == PacketTypes.UseItem:
			packet, send = self.routePacket(packet, send, self.onUseItem)

		elif packet.ID == PacketTypes.Move:
			packet, send = self.routePacket(packet, send, self.onMove)

		elif packet.ID == PacketTypes.GotoAck:
			packet, send = self.routePacket(packet, send, self.onGotoAck)

		elif packet.ID == PacketTypes.UsePortal:
			packet, send = self.routePacket(packet, send, self.onUsePortal)	



		if not send:
			return
		else:
			self.SendPacketToServer(packet)

	"""
	Listens to packets from the server.
	"""
	def ListenToServer(self):

		header = self.serverSocket.recv(5)

		if len(header) == 0 or self.reconnecting:
			self.reset()
			return
		
		# let's see if this prevents indexerror
		leftToRead = 5 - len(header)
		while len(header) < 5:
			header += self.serverSocket.recv(leftToRead)
			leftToRead -= len(header)
			print("ListenToServer: Triggered header reread")

		packetID = header[4]
		expectedPacketLength = struct.unpack("!i", header[:4])[0]
		# read the packet, subtract 5 cuz you already read header
		leftToRead = expectedPacketLength - 5
		data = bytearray()
		
		while (leftToRead > 0): 
			buf = bytearray(self.serverSocket.recv(leftToRead))
			data += buf
			leftToRead -= len(buf)

		# decipher it to update our internal state
		self.serverSendKey.decrypt(data)
		packet = Packet(header, data, packetID)
		send = True

		"""	
		# for debugging
		try:
			if packet.ID not in self.ignoreIn:
				print("Server sent:", PacketTypes.reverseDict[packet.ID])
		except:
			print("Got unknown packet from server, id", packet.ID)
		"""

		# hooks
		if packet.ID == PacketTypes.CreateSuccess:
			self.OnCreateSuccess(packet)

		elif packet.ID == PacketTypes.Reconnect:
			# update map name.
			p = Reconnect()
			p.read(packet.data)
			self.lastReconnect = time.time()
			self.lastGameID = p.gameID
			self.lastReconKey = p.key
			self.currentMap = p.name
			self.reconnecting = True

		elif packet.ID == PacketTypes.ShowEffect:
			packet, send = self.routePacket(packet, send, self.onShowEffect)

		#####################
		# plugin management #
		#####################
		# update internal effect state
		elif packet.ID == PacketTypes.NewTick:
			packet, send = self.routePacket(packet, send, self.onNewTick)

		elif packet.ID == PacketTypes.EnemyShoot:
			packet, send = self.routePacket(packet, send, self.onEnemyShoot)

		elif packet.ID == PacketTypes.Aoe:
			packet, send = self.routePacket(packet, send, self.onAoe)

		# remember new enemies
		elif packet.ID == PacketTypes.Update:
			packet, send = self.routePacket(packet, send, self.onUpdate)

		elif packet.ID == PacketTypes.QuestObjId:
			packet, send = self.routePacket(packet, send, self.onQuestObjectID)

		elif packet.ID == PacketTypes.Death:
			packet, send = self.routePacket(packet, send, self.onDeath)

		elif packet.ID == PacketTypes.Failure:
			packet, send = self.routePacket(packet, send, self.onFailure)

		elif packet.ID == PacketTypes.Text:
			packet, send = self.routePacket(packet, send, self.onText)
			
		if send:
			self.SendPacketToClient(packet)

	"""
	Starts to listen for packets
	"""
	def Listen(self):

		while True:
			try:

				# check if sockets haven't been disabled by other threads
				if self.gameSocket is None or self.serverSocket is None:
					self.reset()

				ready = select.select([self.gameSocket, self.serverSocket], [], [])[0]

				# prioritize reconnects
				if self.reconnecting:

					# check if this is an autonexus
					# if so, trick client into thinking we are nexusing
					if self.reconnectToNexus:
						p = Reconnect()
						p.name = ""
						p.host = ""
						p.port = 2050
						p.gameID = -2 
						p.keyTime = 0
						p.key = []
						p.isFromArena = False
						
						self.SendPacketToClient(CreatePacket(p))
						self.reconnectToNexus = False

					# flush sockets
					if self.gameSocket in ready:
						self.gameSocket.recv(100000)

					if self.serverSocket in ready:
						self.serverSocket.recv(100000)

					self.onReconnect()
					self.reconnecting = False

					# break out of listen loop, recall listen in Proxy class
					return

				elif self.connected:
					
					# client has data ready to send to server
					if self.gameSocket in ready:
						self.ListenToClient()
					# server has data ready to send to client
					if self.serverSocket in ready:
						self.ListenToServer()

			except ConnectionAbortedError as e:
				print("Connection was aborted:", e)
				self.reset()
				self.resetMapName()

			except ConnectionResetError as e:
				print("Connection was reset")
				self.reset()
				self.resetMapName()

			except KeyboardInterrupt:
				print("User aborted. Shutting down proxy.")
				self.connected = False
				self.Close()
				return

			except OSError as e:
				# print(e, "(probably due to attempting to read from a socket that has been closed)")
				traceback.print_exc()
				print("Restarting proxy...")				

			# unused exception rn
			except AoEAutoException:
				print("Autonexusing due to AoE.")
				self.reset()
				self.resetMapName()

			#"""
			except Exception as e:
				
				print("Something went terribly wrong.")
				traceback.print_exc()
				print("Restarting proxy...")
				self.reset()
			#"""

	"""

	Given a specific packet type, call the relevant client onPacketType function to read the packet
	Then, iterate through hook dict to call plugins which hook this packet.

	:param packet: A Packet object
	:param send: whether or not to send the packet
	:param onPacketType: The implemented callback inside a plugin when this packet type is encountered.
		This function will be defined within the Client class.

	returns: (Packet, send)
	"""
	def routePacket(self, packet: Packet, send, onPacketType) -> (Packet, bool):

		p, send = onPacketType(packet, send)

		# if this certain packet has a hook present (meaning it's used by some plugin)
		if packet.ID in self.pluginManager.hooks:

			# then we search for the plugin, and whether if it's active or not.
			for plugin in self.pluginManager.hooks[packet.ID]:
				# if the plugin is active
				if self.pluginManager.plugins[plugin]:
					# at each step, we are editing the packet on the wire
					# important: make sure you're spelling your class methods correctly.
					p, send = getattr(plugin, "on" + PacketTypes.reverseDict[packet.ID])(self, p, send)
					modified = True

		packet = CreatePacket(p)
		return (packet, send)


	# server -> client
	def SendPacketToClient(self, packet):
		self.clientReceiveKey.encrypt(packet.data)
		self.gameSocket.sendall(packet.format())

	# client -> server
	def SendPacketToServer(self, packet):
		self.serverReceiveKey.encrypt(packet.data)
		self.serverSocket.sendall(packet.format())

	# set objid to client's
	def OnCreateSuccess(self, packet):
		p = CreateSuccess()
		p.read(packet.data)
		self.objectID = p.objectID
		self.charID = p.charID


	###################################################
	# various necessary hooks to take care of packets #
	###################################################

	def onText(self, packet: Packet, send: bool) -> (Text, bool):
		p = Text()
		p.read(packet.data)
		return p, send

	def onDeath(self, packet: Packet, send: bool) -> (Death, bool):
		p = Death()
		p.read(packet.data)
		p.PrintString()
		return p, send

	def onShowEffect(self, packet: Packet, send: bool) -> (ShowEffect, bool):
		p = ShowEffect()
		p.read(packet.data)
		if p.effectType == 4:
			try:
				enemy = self.newObjects[p.targetObjectID].objectType
				if enemy != 800 and enemy != 802:
					name = self.enemyName[self.newObjects[p.targetObjectID].objectType]
					print("enemy", enemy, "name", name)
					p.PrintString()
					print()
			# assassin throwing poison
			except KeyError as e:
				print("ShowEffect had KeyError:", e)
				print()
		return p, send

	def onMove(self, packet: Packet, send: bool) -> (Move, bool):
		p = Move()
		p.read(packet.data)
		self.lastx = self.currentx
		self.lasty = self.currenty
		self.currentx = p.newPosition.x
		self.currenty = p.newPosition.y
		self.currentpos = p.newPosition
		return p, send
		
	def onGotoAck(self, packet: Packet, send: bool) -> (GotoAck, bool):
		p = GotoAck()
		p.read(packet.data)
		return p, send	

	def onUsePortal(self, packet: Packet, send: bool) -> (UsePortal, bool):
		p = UsePortal()
		p.read(packet.data)
		return p, send			

	def onAoe(self, packet: Packet, send: bool) -> (Aoe, bool):
		p = Aoe()
		p.read(packet.data)
		p.PrintString()
		print()
		return p, send

	def onFailure(self, packet: Packet, send: bool) -> (Failure, bool):
		p = Failure()
		p.read(packet.data)
		return p, send

	def onPlayerHit(self, packet: Packet, send: bool) -> (PlayerHit, bool):
		p = PlayerHit()
		p.read(packet.data)
		return p, send

	def onGroundDamage(self, packet: Packet, send: bool) -> (GroundDamage, bool):
		p = GroundDamage()
		p.read(packet.data)
		return p, send

	def onEnemyShoot(self, packet: Packet, send: bool) -> (EnemyShoot, bool):
		
		p = EnemyShoot()
		p.read(packet.data)
		# add all its new shots to the dict
		for i in range(p.numShots):
			# this enemy has shot already.
			if p.ownerID in self.seenProjectiles:
				bullet = BulletInfo()
				bullet.bulletType = p.bulletType
				bullet.damage = p.damage
				self.seenProjectiles[p.ownerID].update({p.bulletID + i : bullet})
			# first time enemy is shooting.
			else:
				bullet = BulletInfo()
				bullet.bulletType = p.bulletType
				bullet.damage = p.damage
				self.seenProjectiles.update({p.ownerID : {p.bulletID + i : bullet}})

		return p, send

	def onEnemyHit(self, packet: Packet, send: bool) -> (EnemyHit, bool):
		p = EnemyHit()
		p.read(packet.data)
		return p, send

	def onPlayerShoot(self, packet: Packet, send: bool) -> (PlayerShoot, bool):
		p = PlayerShoot()
		p.read(packet.data)
		return p, send

	def onUseItem(self, packet: Packet, send: bool) -> (UseItem, bool):
		p = UseItem()
		p.read(packet.data)
		if self.blockAbilityUse and p.slotObject.slotID == 1:
			send = False
		return p, send

	def onQuestObjectID(self, packet: Packet, send: bool) -> (QuestObjId, bool):
		p = QuestObjId()
		p.read(packet.data)
		self.latestQuest = p.objectID
		return p, send

	# returns id if id key present, else -1
	def deserializeItemData(self, s: str) -> int:

		if s == "null":
			return -1
		x = json.loads(s)
		if 'id' in x:
			return x['id']

		return -1


	def onUpdate(self, packet: Packet, send: bool) -> (Update, bool):

		p = Update()
		p.read(packet.data)

		for t in p.tiles:
			self.newTiles.update({(t.x, t.y) : t.type})

		for i in p.newObjects:

			if i.objectStatusData.objectID == self.objectID:
				# Get Client objectType
				self.objectType = i.objectType

				for j in i.objectStatusData.stats:
					if j.statType == 0:
						self.maxHP = j.statValue
					elif j.statType == 1:
						self.currentHP = j.statValue
					elif j.statType == 21:
						self.defense = j.statValue

					# 12 - 19 is 1 - 8
					# 71 - 78 is 9 - 16
					for k in range(0, 8):
						if j.statType == 12 + k:
							self.inventoryModel[k] = self.deserializeItemData(j.strStatValue)

					for k in range(0, 8):
						if j.statType == 71 + k:
							self.inventoryModel[k + 8] = self.deserializeItemData(j.strStatValue)
			obj = ObjectInfo()
			obj.pos = i.objectStatusData.pos
			obj.objectType = i.objectType
			self.newObjects.update({i.objectStatusData.objectID : obj})

		return p, send

	def onNewTick(self, packet: Packet, send) -> (NewTick, bool):
		p = NewTick()
		p.read(packet.data)

		for obj in range(len(p.statuses)):

			# got a packet that updates our stats
			if p.statuses[obj].objectID == self.objectID:
				for s in range(len(p.statuses[obj].stats)):

					# max HP
					if p.statuses[obj].stats[s].statType == 0:
						self.maxHP = p.statuses[obj].stats[s].statValue
					# current HP
					elif p.statuses[obj].stats[s].statType == 1:
						self.currentHP = p.statuses[obj].stats[s].statValue
					# defense
					elif p.statuses[obj].stats[s].statType == 21:
						self.defense = p.statuses[obj].stats[s].statValue
					# protection
					elif p.statuses[obj].stats[s].statType == 125:
						self.currentProtection = p.statuses[obj].stats[s].statValue

					# 29, effect 0
					# 96, effect 1
					# 205, effect 2
					# armored, damaging serversided
					elif p.statuses[obj].stats[s].statType == 29:
						self.effect0bits = p.statuses[obj].stats[s].statValue

					elif p.statuses[obj].stats[s].statType == 96:
						self.effect1bits = p.statuses[obj].stats[s].statValue

					elif p.statuses[obj].stats[s].statType == 205:
						self.effect2bits = p.statuses[obj].stats[s].statValue

					# check inventory
					# 12 - 19 is 1 - 8
					# 71 - 78 is 9 - 16
					for j in range(0, 8):
						if p.statuses[obj].stats[s].statType == 12 + j:
							self.inventoryModel[j] = self.deserializeItemData(p.statuses[obj].stats[s].strStatValue)

					for j in range(0, 8):
						if p.statuses[obj].stats[s].statType == 71 + j:
							self.inventoryModel[j + 8] = self.deserializeItemData(p.statuses[obj].stats[s].strStatValue)

		# now cover edge cases in plugins
		# pretty terrible engineering
		# this ensures our injected status effects are turned off and doesn't interfere with real speedy (like from warrior)
		self.turnOffInjectedStatuses()
		return p, send

	def turnOffInjectedStatuses(self):

		for plugin in self.pluginManager.plugins:
			if self.disableSpeedy and type(plugin).__name__ == "Speedy":
				plugin.shutdown(self)
				self.disableSpeedy = False

			elif self.disableSwiftness and type(plugin).__name__ == "Swiftness":
				plugin.shutdown(self)
				self.disableSwiftness = False

	# playertext hook
	def onPlayerText(self, packet: Packet, send: bool) -> (PlayerText, bool):
		p = PlayerText()
		p.read(packet.data)

		# if commands are not disabled
		if not self.screenshotMode:

			if p.text == "/dep":

				for item in self.inventoryModel:

					if item in self.potionStorageID:

						pp = PotionStorageInteraction()
						pp.type = self.potionStorageID[item]
						pp.action = 0
						self.SendPacketToServer(CreatePacket(pp))
				
				send = False

		if p.text.strip() == "/safe":

			if self.screenshotMode:
				self.screenshotMode = False
				self.createNotification("Screenshot Mode", "OFF")
			else:
				self.createNotification("Screenshot Mode", "ON")
				self.screenshotMode = True

			send = False

		elif p.text.strip() == "/help":
			pass

		return p, send

	# when server sends reconnect
	# not a hook, just poorly named
	def onReconnect(self):
		self.reset()

	def UseAbility(self):
		p = UseItem()
		i = SlotObjectData()
		i.objectID = self.objectID
		i.slotID = 1
		i.itemData = ""
		i.useType = 0
		w = WorldPosData()
		w.x = self.currentx
		w.y = self.currenty
		p.slotObject = i
		p.itemUsePos = w
		self.SendPacketToServer(CreatePacket(p))

	def onHello(self, packet: Packet, send: bool) -> (Hello, bool):
		# hello is always sent, try another map update name here
		p = Hello()
		p.read(packet.data)
		#p.PrintString()
		packet = CreatePacket(p)
		if p.gameID in self.gameIDs:
			self.currentMap = self.gameIDs[p.gameID]
		print("MapChange:", self.currentMap)
		return p, send


	# send a message to the player in the client
	def createNotification(self, name, text):

		if self.screenshotMode:
			return

		p = Text()
		p.name = name
		p.text = text
		p.numStars = -1
		p.nameColor = 28369126
		p.textColor = 28369126
		self.SendPacketToClient(CreatePacket(p))

	# function to check if our current location or last location is within some radius
	def inCircle(self, radius: int, pos: WorldPosData) -> bool:
		if math.sqrt((self.lastx - pos.x) ** 2 + (self.lasty - pos.y) ** 2) <= radius:
			return True
		elif math.sqrt((self.currentx - pos.x) ** 2 + (self.currenty - pos.y) ** 2) <= radius:
			return True
		return False

class ObjectInfo:

	def __init__(self):
		self.pos = WorldPosData()
		self.objectType = 0

	def PrintString(self):
		self.pos.PrintString()
		print("objectType", self.objectType)

class BulletInfo:

	def __init__(self):
		# bulletType in XML
		self.bulletType = 0
		self.damage = 0

	def PrintString(self):
		print("bulletType", self.bulletType, "damage", self.damage)

class AoEAutoException(Exception):
	pass