def retrieve(self, name):
"""
Retrieve value based on key, if not found locall
send to successor to find it
"""
self.addMessage("retrieving: " + name)
HashName = int(hashlib.sha1(name.encode('UTF-8')).hexdigest(), 16)
if self.isItMine(self.id, self.predecessorID, HashName):
self.addMessage("it is MINE in GUI: " + str(HashName))
try:
value = self.SavedValues[HashName]
if value:
retrieveMessage = "OK "+ str(value) + "\r\n"
self.addMessage(retrieveMessage)
return value
except:
retrieveMessage = "Not Found " + "\r\n"
self.addMessage(retrieveMessage)
return -1
else:
retrieveMessage = "Retrieve " + str(HashName) + "\r\n"
chordSocketR = ChordSocket()
chordSocketR.connect(self.successorID, self.successorPort)
chordSocketR.chordsend(retrieveMessage)
retMessage = chordSocketR.chordreceive()
if self.getCommand(retMessage) == "Retrieve":
self.addMessage("Message Received for Retrieve ")
chordSocketR.sock.close()
return 1
def join(self, host, port):
"""
Join to the network
host: where is a node running
port: on which port it is running
"""
self.addMessage("Joining host: " + host + " at port: " + port)
chordSocket = ChordSocket()
chordSocket.connect(host, int(port))
## construct a Join -message
bSend = "JOIN " + str(self.id) + " " + self.ipadr + " " + str(self.myport) + "\r\n"
self.addMessage("Sending this JOIN message to node: " + bSend)
chordSocket.chordsend(bSend)
retMessage = chordSocket.chordreceive()
self.addMessage("Received this message as reply for JOIN: " + retMessage)
if self.getCommand(retMessage) == "JOIN_OK":
lrLines = retMessage.split("\r\n")
## first three values are the new predecessor
npID = int(lrLines[0].split(" ")[1])
npIP = str(lrLines[0].split(" ")[2])
npPO = int(lrLines[0].split(" ")[3])
## and the next three values are my new successor
nsID = int(lrLines[0].split(" ")[4])
nsIP = str(lrLines[0].split(" ")[5])
nsPO = int(lrLines[0].split(" ")[6])
self.successorID = nsID
self.successorIP = nsIP
self.successorPort = nsPO
self.predecessorID = npID
self.predecessorIP = npIP
self.predecessorPort = npPO
## need to send NEWNODE message to our predecessor
chordSocketn = ChordSocket()
chordSocketn.connect(self.predecessorIP, int(self.predecessorPort))
nnMessage = "NEWNODE " + str(self.id) + " " + self.ipadr + " " + str(self.myport) + "\r\n"
self.addMessage("Sending this NEWNODE to predecessor: " + self.predecessorIP + ":" + str(self.predecessorPort) + " - " + nnMessage)
chordSocketn.chordsend(nnMessage)
chordSocketn.sock.close()
chordSocket.sock.close()
return 1
def handleServerMessage(self, msg, clientsocket):
"""
reveive message from the Chord Server Thread.
msg: is a string that has \r\n separated lines
clientsocket: if we need to reply something, we use that
"""
self.addMessage("Received Message from Server Thread with: " + msg)
## first, split the message into lines, it's CRLF separated
lLines = msg.split("\r\n")
## TODO: is this info really needed?
self.addMessage(lLines)
## then we determine the command from first line
sCommand = lLines[0].split(" ")[0]
## TODO: do we really want to log everything in stdout
print(lLines)
print(sCommand)
if sCommand == "NEWNODE":
## NEWNODE, we just update our successor with new info
## no reply
nnID = int(lLines[0].split(" ")[1])
nnIP = str(lLines[0].split(" ")[2])
nnPO = int(lLines[0].split(" ")[3])
self.successorID = nnID
self.successorIP = nnIP
self.successorPort = nnPO
clientsocket.close()
return 1
self.addMessage(sCommand)
if sCommand == "JOIN":
## we got JOIN message from Server
## we need to determine if joining us, or forward to next
## it looks lit this
## JOIN 5147385592596484592 127.0.0.1 9002
## so below the [1] number is the field (indexed from 0)
nnID = int(lLines[0].split(" ")[1])
nnIP = str(lLines[0].split(" ")[2])
nnPO = int(lLines[0].split(" ")[3])
## so either we send back our self or ask our successor
if self.isItMine(self.id, self.predecessorID, nnID):
## we have determined tat we are the point to connect to, update our own
## info and send JOIN_OK back
## JOIN_OK. This message is sent by the node which received the JOIN and
##confirms the success of JOIN to the new node. As arguments, JOIN_OK has
##the identifier, the IP address, and port of the predecessor and the
##identifier, the IP address, and port of the successor for the new node (the
##successor is the node sending JOIN_OK and the predecessor is that node
##current predecessor). JOIN_OK will be immediately followed by a
##TRANSFER@message which transfers the key@value pairs which are now
##the responsibility of the new nod
retMessageS = self.getJOIN_OK_and_Update(nnID, nnIP, nnPO)
retMessageS = retMessageS + "\r\n"
self.addMessage(retMessageS)
chordSocketS = ChordSocket(clientsocket)
chordSocketS.chordsend(retMessageS)
clientsocket.close()
return 1
else:
## we determinet that this is not the point to JOIN, so we pass
## the message to our successor as such, wait for reply and
## pass what ever reply we got to the reply - works recursively
## from one node to another
chordSocketS = ChordSocket()
chordSocketS.connect(self.successorIP, int(self.successorPort))
bSendS = msg
chordSocketS.chordsend(bSendS)
retMessageS = chordSocketS.chordreceive()
self.addMessage(retMessageS)
chordSocketS = ChordSocket(clientsocket)
chordSocketS.chordsend(retMessageS)
clientsocket.close()
return 1
elif sCommand == "JOIN_OK":
return 1 ##server never get's a JOIN_OK message in this way
elif sCommand == "LEAVE":
## somebody is leaving, update our PREDECESSOR from the LEAVE message
self.predecessorID = int(lLines[0].split(" ")[1])
self.predecessorIP = str(lLines[0].split(" ")[2])
self.predecessorPort = int(lLines[0].split(" ")[3])
clientsocket.close()
return 1
elif sCommand == "NODEGONE":
## reveived NODEGONE, update our SUCCESSOR accordingly
self.successorID = int(lLines[0].split(" ")[1])
self.successorIP = str(lLines[0].split(" ")[2])
self.successorPort = int(lLines[0].split(" ")[3])
clientsocket.close()
return 1
elif sCommand == "TRANSFER":
## received TRANSFER
## TODO update our dictionary
self.addMessage("TRANSFER " + lLines[0])
clientsocket.close()
return 1
elif sCommand == "STORE":
## received STORE message, either STORE here or pass
## to the successor
HashName = int(lLines[0].split(" ")[1])
value = int(lLines[0].split(" ")[2])
if self.isItMine(self.id, self.predecessorID, HashName):
self.SavedValues[HashName] = value
else:
chordSocketSTO = ChordSocket()
chordSocketSTO.connect(self.successorIP, self.successorPort)
sStore= "STORE " + " "+ name + " : " + value + "\r\n"
chordSocketSTO.chordsend(sStore)
chordSocketSTO.sock.close()
elif sCommand == "RETRIEVE":
## received RETRIEVE, either see if should found locally and try to find
## or send to successor for search
HashName = int(lLines[0].split(" ")[1])
if self.isItMine(self.id, self.predecessorID, HashName):
try:
value = self.SavedValues[HashName]
if value:
retrieveMessage = "OK "+ str(value) + "\r\n"
self.addMessage(retrieveMessage)
clientsocket.close()
return value
except:
retrieveMessage = "Not Found " + "\r\n"
self.addMessage(retrieveMessage)
clientsocket.close()
return -1
else:
retrieveMessage = "Retrieve " + HashName + "\r\n"
chordSocketR = ChordSocket()
chordSocketR.connect(self.successorID, self.successorPort)
chordSocketR.chordsend(retrieveMessage)
retMessage = chordSocketR.chordreceive()
if self.getCommand(retMessage) == "Retrieve":
self.addMessage("Message Received for Retrieve ")
chordSocketR.sock.close()
return 1