def subscribeRequest(self, request, context):
print "\nFRONTEND : new client subscriber ", request.client_ip, " for topic", request.topic
subType = ""
if subscribers.find({"topic": request.topic}).count() > 0:
print "FRONTEND : Not the first client for topic ", request.topic
subType = "old"
else:
print "FRONTEND : First client for topic ", request.topic
subType = "new"
newSubscribers.insert_one({
"topic": request.topic,
"ip": request.client_ip
})
subscribers.insert_one({
"topic": request.topic,
"ip": request.client_ip
})
if subscribers.find({"topic": request.topic}).count() > THRESHOLD:
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.replicaRequest(
pr_pb2.topicSubscribe(topic=request.topic,
client_ip=str(SELF_IP) + ":" + port))
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.subscribeRequestCentral(
pr_pb2.topicDataType(topic=request.topic,
client_ip=str(SELF_IP) + ":" + str(port),
type=subType))
return pr_pb2.acknowledge(ack="temporary acknowledge")
def unsubscribeRequest(self, request_iterator, context):
topicList = []
client_ip = ""
for request in request_iterator:
print "FRONTEND : Unsubscribe request from client", request.client_ip, " for topic", request.topic
client_ip = request.client_ip
topicList.append(request.topic)
for topic in topicList:
subscribers.delete_one({"topic": topic, "ip": client_ip})
count = subscribers.find({"topic": topic}).count()
if count <= THRESHOLD and count > 0:
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.deReplicaRequest(
pr_pb2.topicSubscribe(topic=topic,
client_ip=str(SELF_IP) + ":" + port))
if response.ack == "DONE":
dataDump.delete_many({"topic": topic})
print "TOPIC_SERVER : Dereplicated for topic :", topic
else:
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.unsubscribeRequestCentral(
pr_pb2.topicSubscribe(topic=topic,
client_ip=str(SELF_IP) + ":" + port))
return pr_pb2.acknowledge(ack="done")
def replicaRequest(self, request, context):
document = twoLevelDict.find_one({"topic":request.topic,"subscriber":"NULL"})
allotedServer = document["publisher"]
if twoLevelDict.find({"topic":request.topic,"publisher":request.client_ip}).count() > 0 :
return pr_pb2.acknowledge(ack="Requesting front end server already a replica for "+request.topic)
if twoLevelDict.find({"topic":request.topic,"subscriber":request.client_ip}).count() > 0 :
if IS_MASTER:
response = two_phase_init(pr_pb2.commit_req_data(action="remove",level="3",data_1 = request.topic,data_2="", data_3 = request.client_ip, filename = "twoLevelDict",function_name="replicaRequest"))
if response == "ERROR" :
twoLevelDict.delete_one({"topic":request.topic,"subscriber":request.client_ip})
else :
twoLevelDict.delete_one({"topic":request.topic,"subscriber":request.client_ip})
# twoLevelDict.delete_one({"topic":request.topic,"subscriber":request.client_ip})
if IS_MASTER:
response = two_phase_init(pr_pb2.commit_req_data(action="insert",level="3",data_1 = request.topic,data_2=request.client_ip, data_3 = "NULL", filename = "twoLevelDict",function_name="replicaRequest"))
if response == "ERROR" :
twoLevelDict.insert_one({"topic":request.topic,"publisher":request.client_ip,"subscriber":"NULL"})
else :
twoLevelDict.insert_one({"topic":request.topic,"publisher":request.client_ip,"subscriber":"NULL"})
# twoLevelDict.insert_one({"topic":request.topic,"publisher":request.client_ip,"subscriber":"NULL"})
if IS_MASTER:
response = two_phase_init(pr_pb2.commit_req_data(action="insert",level="3",data_1 = request.topic,data_2=request.client_ip, data_3 = request.client_ip, filename = "twoLevelDict",function_name="replicaRequest"))
if response == "ERROR" :
twoLevelDict.insert_one({"topic":request.topic,"publisher":request.client_ip,"subscriber":request.client_ip})
else :
twoLevelDict.insert_one({"topic":request.topic,"publisher":request.client_ip,"subscriber":request.client_ip})
# twoLevelDict.insert_one({"topic":request.topic,"publisher":request.client_ip,"subscriber":request.client_ip})
channel = grpc.insecure_channel(allotedServer)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.sendBackupRequestReplica(pr_pb2.topicSubscribe(topic=request.topic, client_ip=request.client_ip))
print "Replication for topic server : "+request.client_ip+" started..."
return pr_pb2.acknowledge(ack="Requesting front end server "+request.client_ip+" made a replica of topic(backup sent) "+request.topic)
def subscribeRequestCentral(self, request, context):
print "Subscribe request from access point",request.client_ip," for topic",request.topic," of type :",request.type
allotedServer = ""
if request.type == "new" :
if twoLevelDict.find({"topic":request.topic,"publisher":request.client_ip}).count() > 0:
allotedServer = request.client_ip
else :
l = sys.maxsize
tempIp = ""
cursor = twoLevelDict.find({"topic":request.topic,"subscriber":"NULL"})
for document in cursor :
ip = document["publisher"]
if twoLevelDict.find({"topic":request.topic,"publisher":ip}).count() < l :
l=twoLevelDict.find({"topic":request.topic,"publisher":ip}).count()
tempIp = ip
allotedServer = tempIp
if IS_MASTER:
response = two_phase_init(pr_pb2.commit_req_data(action="insert",level="3",data_1 = request.topic,data_2=allotedServer, data_3 = request.client_ip, filename = "twoLevelDict",function_name="subscribeRequestCentral"))
if response == "ERROR" :
twoLevelDict.insert_one({"topic":request.topic,"publisher":allotedServer,"subscriber":request.client_ip})
else :
twoLevelDict.insert_one({"topic":request.topic,"publisher":allotedServer,"subscriber":request.client_ip})
# twoLevelDict.insert_one({"topic":request.topic,"publisher":allotedServer,"subscriber":request.client_ip})
else :
document = twoLevelDict.find_one({"topic":request.topic,"subscriber":request.client_ip})
allotedServer = document["publisher"]
channel = grpc.insecure_channel(allotedServer)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.sendBackupRequest(pr_pb2.topicSubscribe(topic=request.topic, client_ip=request.client_ip))
print response.ack
return pr_pb2.acknowledge(ack="temporary acknowledge from central server")
def publishData(lst):
request = lst[0]
accesspoint = lst[1]
channel = grpc.insecure_channel(accesspoint)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.publish(
pr_pb2.topicData(topic=request.topic, data=request.data))
return response.ack
def get_front_ip():
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.getFrontIp(pr_pb2.empty())
print("Frontend server Ip alloted: " + response.ip)
if response.ip == "NONE":
print "No frontend servers active ...extiting..."
exit()
return response.ip
def subscribe_topic(topic, self_ip):
if subscribedTopics.find({"topic": topic}).count() > 0:
print "Already subscribed to the topic :", topic
else:
channel = grpc.insecure_channel(ACCESS_POINT)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.subscribeRequest(
pr_pb2.topicSubscribe(topic=topic, client_ip=self_ip))
subscribedTopics.insert_one({"topic": topic})
def sendBackupRequest(self, request, context):
cursor = dataDump.find({"topic": request.topic})
lst = []
for document in cursor:
lst.append(document["data"])
channel = grpc.insecure_channel(request.client_ip)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.sendBackup(generateBackup(request.topic, lst))
return pr_pb2.acknowledge(ack="data send to : " + request.client_ip +
" complete...")
def forwardBackupToClient(lst):
requestList = lst[0]
client_ip = lst[1]
lst = []
temp_topic = ""
for request in requestList:
lst.append(request.data)
temp_topic = request.topic
channel = grpc.insecure_channel(client_ip)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.forwardBackup(generateBackup(temp_topic, lst))
def sendBackupRequestReplica(self, request, context):
print "TOPIC_SERVER : Sending data backup for topic : " + request.topic + " to the new replica : " + request.client_ip
cursor = dataDump.find({"topic": request.topic})
lst = []
for document in cursor:
lst.append(document["data"])
channel = grpc.insecure_channel(request.client_ip)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.sendBackupReplica(generateBackup(request.topic, lst))
return pr_pb2.acknowledge(ack="data send to : " + request.client_ip +
" replica complete...")
def publishRequest(self, request, context):
print "FRONTEND : Data received for topic : " + request.topic
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
responses = stub.giveIps(pr_pb2.topic(topic=request.topic))
returned_ips = []
for response in responses:
print("FRONTEND : Data to be sent to topic server IP: " +
response.ip + " for topic: " + request.topic)
returned_ips.append(response.ip)
lst = []
pool = ThreadPool(len(returned_ips))
for returned_ip in returned_ips:
lst.append([request, returned_ip])
results = pool.map(publishData, lst)
return pr_pb2.acknowledge(ack="Published in " + str(len(results)) +
" topic servers")
def two_phase_init(request):
while(IS_LOCKED == True):
pass
channel = grpc.insecure_channel(backupCentralServer)
stub = pr_pb2_grpc.PublishTopicStub(channel)
retries = 2
while (retries>0) :
try:
response = stub.commit_request(request)
if response.ack=="OK":
logging.info("%s:%s:COMPLETE",str(datetime.now()),request.filename)
return "COMPLETE"
else :
return "ERROR"
except Exception as e:
retries -= 1
if retries==0:
logging.info("%s:%s:Backup down, performing transaction...",str(datetime.now()),request.filename)
print "Backup down...performing transaction"
return "ERROR"
def publish(self, request, context):
print "TOPIC_SERVER : Data received for topic : " + request.topic
dataDump.insert_one({"topic": request.topic, "data": request.data})
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
responses = stub.giveSubscriberIps(
pr_pb2.topicSubscribe(topic=request.topic,
client_ip=str(SELF_IP) + ":" + port))
ipList = []
for response in responses:
ipList.append(response.ip)
print("TOPIC_SERVER : frontend subscriber IP received: " +
response.ip + " for topic: " + request.topic)
if ipList[0] == "none":
return pr_pb2.acknowledge(ack="No subscribers for this replica")
pool = ThreadPool(len(ipList))
lst = []
for client_ip in ipList:
lst.append([request, client_ip])
results = pool.map(sendToFrontend, lst)
return pr_pb2.acknowledge(ack="Data send to clients complete")
def push_topic(topic, data):
channel = grpc.insecure_channel(ACCESS_POINT)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.publishRequest(pr_pb2.topicData(topic=topic, data=data))
print("Ack received: " + response.ack)
print "Type 1 for publish\nType 2 for subscribe\nType 3 for unsubscribe\nType 4 for exit"
response = raw_input()
if response == "1":
print "Enter topic"
topic = raw_input()
print "Enter data"
data = raw_input()
push_topic(topic, data)
elif response == "2":
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
responses = stub.querryTopics(pr_pb2.empty())
topicList = []
i = 0
for response in responses:
i += 1
topicList.append(response.topic)
cursor = subscribedTopics.find({})
subscribedTopicsList = []
for document in cursor:
subscribedTopicsList.append(document["topic"])
newTopicList = list(set(topicList) - set(subscribedTopicsList))
i = 0
for topic in newTopicList:
print i, ": ", topic
i += 1
def commit_request(self,request,context):
if request.filename == "twoLevelDict":
if request.action == "remove" :
if request.level == "3" :
documents = twoLevelDict.find({"topic":request.data_1,"subscriber":request.data_3})
for document in documents:
pending_twoLevelDict.insert_one({"topic":document["topic"],"publisher":document["publisher"],"subscriber":document["subscriber"],"action":"remove"})
twoLevelDict.delete_one({"topic":request.data_1,"subscriber":request.data_3})
logging.info("%s:%s:REMOVE 3 %s %s %s",str(datetime.now()),request.filename,request.data_1,"NIL",request.data_3)
elif request.level == "2" :
documents = twoLevelDict.find({"topic":request.data_1,"publisher":request.data_2})
for document in documents:
pending_twoLevelDict.insert_one({"topic":document["topic"],"publisher":document["publisher"],"subscriber":document["subscriber"],"action":"remove"})
twoLevelDict.delete_many({"topic":request.data_1,"publisher":request.data_2})
logging.info("%s:%s:REMOVE 2 %s %s %s",str(datetime.now()),request.filename,request.data_1,request.data_2,"NIL")
elif request.action == "insert":
if request.level == "3" :
twoLevelDict.insert_one({"topic":request.data_1,"publisher":request.data_2,"subscriber":request.data_3})
documents = twoLevelDict.find({"topic":request.data_1,"publisher":request.data_2,"subscriber":request.data_3})
for document in documents:
pending_twoLevelDict.insert_one({"topic":document["topic"],"publisher":document["publisher"],"subscriber":document["subscriber"],"action":"insert"})
logging.info("%s:%s:INSERT 3 %s %s %s",str(datetime.now()),request.filename,request.data_1,request.data_2,request.data_3)
elif request.filename == "frontends" :
if request.action == "remove" :
if request.level == "2" :
if request.data_1 == "ip" :
pending_frontends.insert_one({"type":request.data_1,request.data_1:request.data_2,"action":"remove"})
frontends.delete_one({"type":request.data_1,request.data_1:request.data_2})
logging.info("%s:%s:REMOVE 2 %s %s %s",str(datetime.now()),request.filename,request.data_1,request.data_2,request.data_3)
else :
pending_frontends.insert_one({"type":request.data_1,request.data_1:int(request.data_2),"action":"remove"})
frontends.delete_one({"type":request.data_1,request.data_1:int(request.data_2)})
logging.info("%s:%s:REMOVE 2 %s %s %s",str(datetime.now()),request.filename,request.data_1,request.data_2,request.data_3)
elif request.action == "insert" :
if request.level == "2" :
if request.data_1 == "ip" :
pending_frontends.insert_one({"type":request.data_1,request.data_1:request.data_2,"action":"insert"})
frontends.insert_one({"type":request.data_1,request.data_1:request.data_2})
logging.info("%s:%s:INSERT 2 %s %s %s",str(datetime.now()),request.filename,request.data_1,request.data_2,request.data_3)
else :
pending_frontends.insert_one({"type":request.data_1,request.data_1:int(request.data_2),"action":"insert"})
frontends.insert_one({"type":request.data_1,request.data_1:int(request.data_2)})
logging.info("%s:%s:INSERT 2 %s %s %s",str(datetime.now()),request.filename,request.data_1,request.data_2,request.data_3)
channel = grpc.insecure_channel(centralServer)
stub = pr_pb2_grpc.PublishTopicStub(channel)
TIMEOUT = 3
print str(TIMEOUT),"seconds to kill central server..."
time.sleep(TIMEOUT)
retries = 0
while(True) :
try :
response = stub.commit_phase_two(request)
if response.ack == "COMMIT":
pending_frontends.drop()
pending_twoLevelDict.drop()
logging.info("%s:%s:COMMIT",str(datetime.now()),request.filename)
return pr_pb2.acknowledge(ack="OK")
else :
return pr_pb2.acknowledge(ack="ERROR")
except :
retries += 1
if retries > MAX_RETRIES :
print "Central down..."
roll_back(request)
logging.info("%s:%s:ROLLBACK",str(datetime.now()),request.filename)
return pr_pb2.acknowledge(ack="ERROR")
def register_ip():
channel = grpc.insecure_channel(CENTRAL_SERVER_IP)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.registerIp(pr_pb2.ips(ip=str(SELF_IP) + ":" + str(port)))
print "Ip added to central server..."
def sendToFrontend(lst):
request = lst[0]
client_ip = lst[1]
channel = grpc.insecure_channel(client_ip)
stub = pr_pb2_grpc.PublishTopicStub(channel)
response = stub.sendData(request)
