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test.py
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import pickle
import sys
import socket
import os
import struct
from _thread import start_new_thread
import signal
import threading
if os.path.exists('files') == False:
os.mkdir('files')
if os.path.exists('code') == False:
os.mkdir('code')
def handler(signum,frame):
pickle.dump(bNameCount,open('code/fileCount.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
print('saving structure')
pickle.dump(root, open('code/root.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
print('Terminating all threads')
os.system('kill -9 %d' % os.getpid())
print('NOTE: The server with the latest file system state should be started first or there is a risk of data loss.')
signal.signal(signal.SIGINT, handler)
if (os.path.exists('code/serverDict.pkl')):
serverDict = pickle.load(open('code/serverDict.pkl','rb'))
else:
print('ERROR: Server Name Configuration file not found')
print('Starting Server for the first time')
print('Start at least two servers when starting the system FOR THE FIRST TIME to add backup server for replication.')
print('Server Names should be unique')
myInp = input('Enter Server Number: ')
#s1Inp = input('Enter Backup Server Number: ')
#serverDict = {'myName':'sv'+str(myInp),'server1':'sv'+str(s1Inp)}
while True:
try:
inpNumb = int(myInp)
break
except:
myInp = input('Invalid Format.\nEnter Server Number: ')
serverDict = {'myName':'sv'+str(inpNumb)}
pickle.dump(serverDict,open('code/serverDict.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
ip = ''
port = 0
bNameCount = 0
if(os.path.exists('code/fileCount.pkl')):
bNameCount = pickle.load(open('code/fileCount.pkl','rb'))
else:
mCo = int(serverDict['myName'][2])
bNameCount = mCo*100000
pickle.dump(bNameCount,open('code/fileCount.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
instruct = ['help','dir','delete','upload','download','edit']
root = None
activeServers = None
class ServerList:
def __init__(self,ip,data):
self.ip = ip
self.mesg = data.split(' ')
self.port = int(self.mesg[1])
self.name= self.mesg[0]
self.active = False
self.socket = None
print(self.mesg)
def checkUDP():
serverList = []
message = b'client name'
multicast_group = ('224.1.1.6', 10006)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(0.2)
ttl = struct.pack('b', 1)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl)
sent = sock.sendto(message, multicast_group)
while True:
try:
data, server = sock.recvfrom(16)
if data.decode().split()[0]!=serverDict['myName']:
serverList.append(ServerList(server[0],data.decode()))
except socket.timeout:
break
else:
a=1
sock.close()
return serverList
class Node:
def __init__(self,name,t,bName,size,sList = None):
self.name = name
self.type = t
self.nbors = []
self.bName = str(bName)
self.parent = None
self.size = size
if t==False:
self.servers = sList
def getName(self):
return self.name
def getType(self):
return self.type
def getNbors(self):
return self.nbors
def getBName(self):
return self.bName
def getParent(self):
return self.parent
def getNodeByName(self,name):
for i in self.nbors:
if(i.getName()==name):
return i
def rmFileByName(self,name):
for i in self.nbors:
if(i.getName()==name and i.type==False):
self.nbors.remove(i)
return True,i
return False,i
def rmDirByName(self,name):
for i in self.nbors:
if(i.getName()==name and i.type==True):
if(len(i.nbors)>0):
return False
self.nbors.remove(i)
return True
return False
def addNode(self,name,t,bName,size,sList=None):
node = Node(name,t,bName,size,sList)
node.parent = self
self.nbors.append(node)
return node
def searchNode(self,node,myList,sName,xName):
if node.type == False:
if sName == node.servers[0] or sName == node.servers[1]:
if os.path.exists('files/'+node.bName)==False:
if xName == node.servers[0] or xName == node.servers[1]:
myList.append(node.bName)
for i in node.nbors:
self.searchNode(i,myList,sName,xName)
def searchAllNodes(self,node,myList):
if node.type == False and serverDict['myName'] in node.servers:
myList.append(node.bName)
for i in node.nbors:
self.searchAllNodes(i,myList)
def searchAllNodesCommand(self,node,myList):
if node.type == False:
myList.append(node.bName)
for i in node.nbors:
self.searchAllNodesCommand(i,myList)
def findMin(self):
global serverDict
mynewDict = {}
for xy in serverDict.values():
if xy != serverDict['myName']:
mynewDict[xy]=0
root.getMinimumFileServer(root,mynewDict,serverDict['myName'])
if(len(mynewDict)!=0):
v = list(mynewDict.values())
k = list(mynewDict.keys())
k[v.index(min(v))]
print('FILE TO BE REPLICATED ON SERVER '+k[v.index(min(v))])
return k[v.index(min(v))]
return None
#TEST
def getMinimumFileServer(self,node,myDict,myName):
if node.type == False:
for i in node.servers:
if i != myName:
if i in myDict:
myDict[i] = myDict[i]+1
else:
myDict[i] = 1
for i in node.nbors:
self.getMinimumFileServer(i,myDict,myName)
def getNodeByAnyName(self,node,name):
if node.name==name or str(node.bName)==name:
print(node.name+ ' '+node.bName +' s1:'+node.servers[0]+' +s2'+node.servers[1])
for i in node.nbors:
self.getNodeByAnyName(i,name)
# root = Node('home',True,str(1),0)
# root.addNode('notes.txt',False,str(2),0)
# root.addNode('Work',True,str(11),10)
# root.addNode('Games',True,str(3),10)
# root.nbors[2].addNode('NFS',True,str(4),10)
# root.nbors[2].addNode('COD',True,str(5),10)
# root.nbors[1].addNode('Office',True,str(6),10)
# root.nbors[1].addNode('document.txt',False,str(7),10)
# pickle.dump(root, open('code/root.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
def searchFiles():
global root
def doServerStuff(sConnected,initiator):
print('awaiting instruction from server '+sConnected.name)
try:
while True:
instruct = sConnected.socket.recv(1024).decode()
x = instruct.split('\n')
for i in x:
p = i.split()
if(p[0]=='create'):
commandAns(i,xType = True)
elif(p[0]=='rm'):
commandAns(i,xType = True )
elif (p[0]=='incoming'):
fName = p[1]
fSize = int(p[2])
fBName = p[3]
fPath = p[4]
fNew = p[5]=='new'
nameSERVER = p[6]
nameSERVER2 = p[7]
spList = [nameSERVER,nameSERVER2]
binaryN = int(fBName)
path = fPath.split('\\')
head = root
for i in range(2,len(path)):
if(len(path[i])==0):
continue
head = head.getNodeByName(path[i])
# - decide which server to send t
if fNew:
cCount = 1
some = head.getNodeByName(fName)
sName= ''
while some != None:
sName = fName+'('+str(cCount)+')'
cCount = cCount +1
some = head.getNodeByName(sName)
fName = sName
head.addNode(fName,False,binaryN,fSize,spList)
else:
try:
tempNode = head.getNodeByName(fName)
if os.path.exists('files/'+tempNode.bName):
os.remove('files/'+tempNode.bName)
head.nbors.remove(head.getNodeByName(fName))
except:
a=1
head.addNode(fName,False,binaryN,fSize,spList)
except:
print('SERVER '+sConnected.name+'DISCONNECTED')
print('Closing socket and removing from active list')
for i in activeServers:
if i.name == sConnected.name:
activeServers.remove(i)
sConnected.socket.close()
if initiator:
pickle.dump(bNameCount,open('code/fileCount.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
print('saving structure')
pickle.dump(root, open('code/root.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
startupProtocol()
else:
print('SERVER '+sConnected.name+'DISCONNECTED')
print('Closing socket')
return
#DO STARTUP STUFF AGAIN
#STARTUP PROTOCOL
def startupProtocol():
global root, activeServers,serverDict
activeServers = checkUDP()
if len(activeServers)==0:
#root = Node('home',True,str(1),0)
if(os.path.exists('code/root.pkl')):
root = pickle.load(open('code/root.pkl','rb'))
else:
root = Node('home',True,str(1),0)
delList = os.listdir('files/')
for sc in delList:
os.remove('files/'+sc)
pickle.dump(root, open('code/root.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
else:
if len(serverDict)==1:
serverDict['server1']=activeServers[0].name
print('Backup Server Found')
pickle.dump(serverDict,open('code/serverDict.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
for i in activeServers:
myIP = i.ip
myPORT = i.port
serverSock = socket.socket()
serverSock.connect((myIP,myPORT))
print('CONNECTED TO SERVER')
#i.active = True
i.socket = serverSock
serverSock.send(serverDict['myName'].encode())
serverSock.recv(1024)
serverSock.send('startup'.encode())
fileN = int(serverSock.recv(1024).decode())
print('SENDING '+str(fileN)+' files to server '+i.name)
serverSock.send('ready'.encode())
print('RECEIVING FILES')
print('WAITING FOR FIRST FILE NAME')
for nM in range (0,fileN):
fileName = serverSock.recv(1024).decode()
f = open('files/'+fileName,'rb')
fileSize = str(os.stat('files/'+fileName).st_size)
serverSock.send(fileSize.encode())
serverSock.recv(1024)
l = f.read(1024)
while len(l)>0:
serverSock.send(l)
l = f.read(1024)
f.close()
print('FILE RECEIVING FINISHED')
print('RECEIVING STRUCTURE')
fileN = str(1)
while(int(fileN)!=0):
root = pickle.loads(serverSock.recv(60000))
fileList = []
root.searchNode(root,fileList,serverDict['myName'],i.name)
allFiles = []
root.searchAllNodes(root,allFiles)
weHaveFiles = os.listdir('files/')
for xF in weHaveFiles:
if xF not in allFiles:
os.remove('files/'+xF)
fileN = str(len(fileList))
serverSock.send(fileN.encode())
serverSock.recv(1024)
print('SENDING FILES')
for j in fileList:
serverSock.send(j.encode())
fSize = serverSock.recv(1024).decode()
fSize = int(fSize)
serverSock.send('ready'.encode())
f = open('files/'+j,'wb')
cSize = 0
while fSize > cSize:
fileContent = serverSock.recv(1024)
cSize = cSize + len(fileContent)
f.write(fileContent)
f.close()
serverSock.send('files sending finished'.encode())
print('ACTIVATING SERVER')
i.active = True
start_new_thread(doServerStuff,(i,True))
startupProtocol()
def runBroadcastThread(threadName,port):
multicast_group = '224.1.1.6'
server_address = ('', 10006)
# Create the socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# Bind to the server address
sock.bind(server_address)
# Tell the operating system to add the socket to
# the multicast group on all interfaces.
group = socket.inet_aton(multicast_group)
mreq = struct.pack('4sL', group, socket.INADDR_ANY)
sock.setsockopt(
socket.IPPROTO_IP,
socket.IP_ADD_MEMBERSHIP,
mreq)
# Receive/respond loop
while True:
print('\nwaiting to receive message')
data, address = sock.recvfrom(1024)
name = address[0]
print(address[0])
print('received {} bytes from {}'.format(
len(data), address))
print(data)
print('sending acknowledgement to', address)
mesg = serverDict['myName'] + ' '+str(port)
sock.sendto(mesg.encode(), address)
def getListString(myList,c = '\n'):
ans=''
for i in myList:
ans = ans + c+i
return ans
def getListStringNodes(myList,c='\n'):
ans=''
for i in myList:
ans = ans + c+i.getName()
return ans
def commandAns(query,fSock = None,xType = None):
global bNameCount, root
if(xType!=None):
print('AT SERVER REQUEST - RUNNING QUERY '+query)
head = root
modified = 'true'
q = query.split()
qPath = q.pop()
sPath = qPath.split('\\')
path = []
path.append(head)
for i in range(2,len(sPath)):
if(len(sPath[i])==0):
continue
head = head.getNodeByName(sPath[i])
path.append(head)
#TESTING
if(head == None):
head=root
path=[]
path.append(head)
return 'Directory you were in was deleted',path,head
print('CAUGHT')
#TESTING
# print(head.getName())
# print(qPath)
# print(sPath)
cmd = q[0]
if(cmd == 'help'):
return getListString(instruct),path,head
elif(cmd == 'dir'):
if(len(head.getNbors())>0):
return getListStringNodes(head.getNbors()),path,head
else:
return 'Directory is currently empty',path,head
elif(cmd == 'cd'):
if(len(q)<2):
return 'Incomplete - Write more',path,head
if(q[1]=='..'):
if(head==root):
return 'You are already at the root directory',path,head
else:
head=head.getParent()
path.remove(path[len(path)-1])
return 'Directory Changed',path,head
newDir = q[1]
newHead = head.getNodeByName(newDir)
if(newHead==None):
return 'Invalid Directory Name',path,head
elif(newHead.type == False):
return 'Cant switch - the given name is a file',path,head
else:
head=newHead
path.append(head)
return 'Directory head now at '+head.getName(),path,head
elif(cmd =='download'):
if(len(q)<2):
return 'Incomplete - Write more',path,head
newDir = q[1]
newHead = head.getNodeByName(newDir)
if(newHead==None):
return 'Invalid File Name',path,head
elif(newHead.type):
return 'Cant open - the given name is a directory',path,head
else:
if os.path.exists('files/'+newHead.getBName()):
toSend = 'incoming '+newHead.getName()+' '+str(os.stat('files/'+newHead.getBName()).st_size)+' '+newHead.getBName()+' '+getListStringNodes(path,'\\')
# fSock.send(toSend.encode())
fSock.send(toSend.encode())
if(fSock.recv(1024).decode()=='ready'):
f = open('files/'+newHead.getBName(),'rb')
l = f.read(1024)
while len(l)>0:
fSock.send(l)
l = f.read(1024)
f.close()
confirm = fSock.recv(1024).decode()
if(confirm == 'T'):
return 'File Opened',path,head
else:
return 'File failed to open',path,head
return 'File Not Opened',path,head
else:
return 'chServer '+newHead.servers[0]+' '+newHead.servers[1]+'\n'+query,path,head
elif(cmd == 'create'):
if(len(q)<3):
return 'Incomplete - Write more',path,head
newHead = head.getNodeByName(q[2])
if(newHead!=None):
return 'A File or Directory already exists by this name',path,head
if(q[1]=='file'):
return 'create '+q[2]+' '+getListStringNodes(path,'\\'),path,head
elif(q[1]=='dir'):
head.addNode(q[2],True,bNameCount,0)
bNameCount+=1
if(xType == None):
runUpdateDir(instruct =query)
return '\''+q[2]+'\' Created in the Current Directory',path,head
else:
return 'Incorrect Command',path,head
elif(cmd == 'upload'):
if(len(q)<3):
return 'Incomplete - Write more',path,head
newHead = head.getNodeByName(q[2])
if(newHead!=None):
return 'A File or Directory already exists by this name',path,head
if(q[1]=='file'):
return 'upload '+q[2]+' '+getListStringNodes(path,'\\'),path,head
else:
return 'Incorrect Command',path,head
elif(cmd == 'rm'):
if(len(q)<3):
return 'Incomplete - Write more',path,head
if(q[1]=='file'):
delCheck, tempNode = head.rmFileByName(q[2])
if(delCheck):
if os.path.exists('files/'+tempNode.bName):
os.remove('files/'+tempNode.bName)
if(xType == None):
runUpdateDir(instruct =query)
return '\''+q[2]+'\' Deleted',path,head
else:
return 'File doesn\'t Exist',path,head
elif(q[1]=='dir'):
if(head.rmDirByName(q[2])):
if(xType == None):
runUpdateDir(instruct=query)
return '\''+q[2]+'\' Deleted',path,head
else:
return 'Directory doesn\'t Exist or may not be empty',path,head
else:
return 'Incorrect Command',path,head
else:
return 'Invalid Command',path,head
def runUpdateDir(fileInfo=None,instruct = None):
for i in activeServers:
if i.active:
if instruct == None and i.name !=fileInfo[7]:
toSend = 'incoming '+fileInfo[1]+' '+str(os.stat('files/'+str(fileInfo[3])).st_size)+' '+str(fileInfo[3])+' '+fileInfo[4]+' '+fileInfo[5]+' '+fileInfo[6]+' '+fileInfo[7]
i.socket.send(toSend.encode())
print('X SENT')
elif instruct != None:
try:
i.socket.send(instruct.encode())
except:
print('NOT SENT')
def runFileSender(fileInfo,serverSend):
sList = checkUDP()
confirm = 'fail'
if(len(sList)==0):
print('No Servers Found')
return
for i in sList:
if i.name == serverSend:
ip = i.ip
port = i.port
fSock = socket.socket()
fSock.connect((ip, port))
fSock.send(serverDict['myName'].encode())
fSock.recv(1024)
#SENDING FILE
toSend = 'incomingServer '+fileInfo[1]+' '+str(os.stat('files/'+str(fileInfo[3])).st_size)+' '+str(fileInfo[3])+' '+fileInfo[4]+' '+fileInfo[5]
# fSock.send(toSend.encode())
fSock.send(toSend.encode())
if(fSock.recv(1024).decode()=='ready'):
f = open('files/'+str(fileInfo[3]),'rb')
l = f.read(1024)
while len(l)>0:
fSock.send(l)
l = f.read(1024)
f.close()
confirm = fSock.recv(1024).decode()
if(confirm == 'success'):
print('File Successfully Saved')
else:
print('Failed')
fSock.close()
return confirm
def serverComm(threadName,delay,fSock,addr,nameSERVER):
global bNameCount,root, serverDict
fSock.send('connected'.encode())
head = root
status= 'fail'
#pathString= getListStringNodes(path,'\\')
status = 'success'
instruct = fSock.recv(1024).decode()
p = instruct.split()
# if(serverDict['myName']=='sv2'):
# print('hi3')
if(p[0]=='startup'):
if len(serverDict)==1:
serverDict['server1']=nameSERVER
print('Backup Server Found')
pickle.dump(serverDict,open('code/serverDict.pkl', 'wb'), protocol=pickle.HIGHEST_PROTOCOL)
print('RECEIVED CONNECTION FROM SERVER')
fileList = []
root.searchNode(root,fileList,serverDict['myName'],nameSERVER)
noOfFiles = str(len(fileList))
print('Requesting '+noOfFiles + 'from server '+nameSERVER)
fSock.send(noOfFiles.encode())
fSock.recv(1024)
for j in fileList:
fSock.send(j.encode())
fSize = fSock.recv(1024).decode()
fSize = int(fSize)
fSock.send('ready'.encode())
f = open('files/'+j,'wb')
cSize = 0
while fSize > cSize:
fileContent = fSock.recv(1024)
cSize = cSize + len(fileContent)
f.write(fileContent)
f.close()
fileN = str(1)
while(int(fileN)!=0):
mesg = pickle.dumps(root)
print('SENT STRUCTURE')
fSock.send(mesg)
print('WAITING FOR NUMBER OF FILES TO RECEIVE')
fileN = int(fSock.recv(1024).decode())
print('SENDING '+str(fileN)+' files to server '+nameSERVER)
fSock.send('ready'.encode())
print('WAITING FOR FIRST FILE NAME')
for i in range (0,fileN):
fileName = fSock.recv(1024).decode()
f = open('files/'+fileName,'rb')
fileSize = str(os.stat('files/'+fileName).st_size)
fSock.send(fileSize.encode())
fSock.recv(1024)
l = f.read(1024)
while len(l)>0:
fSock.send(l)
l = f.read(1024)
f.close()
fSock.recv(1024)
newServer = ServerList(addr,nameSERVER+' 0')
newServer.socket = fSock
newServer.active = True
activeServers.append(newServer)
doServerStuff(newServer,False)
elif(p[0]=='rm'):
print('IS THIS CODE RUNNING?')
q = instruct.split()
qPath = q.pop()
sPath = qPath.split('\\')
path = []
path.append(head)
for i in range(2,len(sPath)):