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server.py
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#$ curl -v -i http://127.0.0.1:8000/GET?key=abc
import time
from http.server import BaseHTTPRequestHandler
from urllib import parse
import os
import json
import simplejson #for reading put data as json object
import socket
import requests
class handleRequests(BaseHTTPRequestHandler):
def _set_headers(self):
self.send_response(200)
self.send_header('Content-type', 'text/html')
self.end_headers()
def do_GET(self):
self._set_headers()
parsed_path = parse.urlparse(self.path)
query = parsed_path.query
if 'search' in query: ##get request for particular storage node
search = query[query.find('search')+7:]
if(findStorageNode(search) or f==2):
self.wfile.write(bytes(ipaddr, 'utf-8'))
return
else:
self.wfile.write(bytes("not found", 'utf-8'))
return
elif 'file' in query:
with open('bkpdata.txt', 'r+') as json_file:
sendbkpdata = json.load(json_file)
self.wfile.write(bytes(json.dumps(sendbkpdata),'utf-8'))
return
elif 'bkp' in query:
with open('data.txt', 'r+') as json_file:
sendbkpdata = json.load(json_file)
self.wfile.write(bytes(json.dumps(sendbkpdata),'utf-8'))
return
key = query[query.find('key')+4:]
values = []
if(f==1):
file = 'bkpdata.txt'
else:
file = 'data.txt'
with open(file, 'r') as json_file:
data = json.load(json_file)
try:
values = data[key]
#print(values)
values = str(values)
self.wfile.write(bytes(values, 'utf-8'))
except KeyError:
error = "Key not found!"
self.wfile.write(bytes(error, 'utf-8'))
def do_PUT(self):
self._set_headers()
content_length = int(self.headers['Content-Length'])
put_data = self.rfile.read(content_length)
data = simplejson.loads(put_data)
key = data['key']
print("key is", key)
values = data['values']
print("values is", values)
with open("conf.txt", "r") as f:
range_val = f.readline()
first=range_val.split("-")[0]
last=range_val.split("-")[1]
last=last.splitlines()[0]
bkp_range_val = f.readline()
bkp_first=bkp_range_val.split("-")[0]
bkp_last=bkp_range_val.split("-")[1]
bkp_last=bkp_last.splitlines()[0]
#add if condition!!!
if first<=key<=last:
with open('data.txt', 'r+') as json_file:
kvstore_data = json.load(json_file)
print(type(kvstore_data))
if key in kvstore_data.keys():
error = "Key already present! Try with a different key."
self.wfile.write(bytes(error, 'utf-8'))
return
else:
kvstore_data[key] = values
json_file.seek(0)
json.dump(kvstore_data, json_file)
message = "SUCCESFULLY WRITTEN"
self.wfile.write(bytes(message, 'utf-8'))
return
elif bkp_first<=key<=bkp_last:
with open('bkpdata.txt', 'r+') as json_file:
kvstore_data = json.load(json_file)
print(type(kvstore_data))
if key in kvstore_data.keys():
error = "Key already present! Try with a different key."
self.wfile.write(bytes(error, 'utf-8'))
else:
kvstore_data[key] = values
json_file.seek(0)
json.dump(kvstore_data, json_file)
message = "SUCCESFULLY WRITTEN"
self.wfile.write(bytes(message, 'utf-8'))
def rval():
with open("conf.txt", "r") as f:
range_val = f.read(3)
return range_val
def sync():
first=""
flag=0
with open("conf.txt", "r") as f:
range_val = f.read(3)
first=range_val.split("-")[0]
last=range_val.split("-")[1]
children=zk.get_children("/zkslave")
payload = {'search':first}
for child in children:
data, stat=zk.get("/zkslave/"+child)
ip=data.decode("utf-8").split("+")[0]
if(ip==str(ipaddr)):
continue
r = requests.get('http://'+ip+':8000/get', params=payload)
print(r.text)
if r.text != 'not found':
flag=1
break
if(flag==0):
print("sync not required")
return
ip=r.text
payload = {'file':first}
r = requests.get('http://'+ip+':8000/get',params=payload)
recvbkpdata = r.json()
print(recvbkpdata)
with open("data.txt", "r+") as json_file:
json_file.seek(0)
if len((json.load(json_file)).keys())==len(recvbkpdata.keys()):
return
with open("data.txt", "w+") as json_file:
json.dump(recvbkpdata, json_file)
#send entire json object for new function sendfile
def bkpsync():
first=""
flag=0
with open("conf.txt", "r") as f:
f.readline()
range_val = f.read(3)
first=range_val.split("-")[0]
last=range_val.split("-")[1]
children=zk.get_children("/zkslave")
payload = {'search':first}
for child in children:
data, stat=zk.get("/zkslave/"+child)
ip=data.decode("utf-8").split("+")[0]
if(ip==str(ipaddr)):
continue
r = requests.get('http://'+ip+':8000/get', params=payload)
print(r.text)
if r.text != 'not found':
flag=1
break
if(flag==0):
print("bkpsync not required")
return
ip=r.text
payload = {'bkp':first}
r = requests.get('http://'+ip+':8000/get',params=payload)
recvbkpdata = r.json()
print(recvbkpdata)
with open("bkpdata.txt", "r+") as json_file:
json_file.seek(0)
if len((json.load(json_file)).keys())==len(recvbkpdata.keys()):
return
with open("bkpdata.txt", "w+") as json_file:
json.dump(recvbkpdata, json_file)
#load and send json object from file
def init():
global node
temp=str(ipaddr)+"+"+rval()
if not zk.exists("/zkslave"):
zk.create("/zkslave")
if zk.exists("/master"):
zk.delete(node)
node=zk.create("/zkslave/slave",bytes(temp, 'utf-8'),ephemeral=True, sequence=True)
else:
l=zk.get_children("/")
l.sort()
if node=="/"+l[0]:
zk.delete(node)
node=zk.create("/master",bytes(temp,'utf-8'), ephemeral=True)
zk.create("/zkslave/master",bytes(temp,'utf-8'), ephemeral=True)
else:
time.sleep(3)
if node=="/"+l[1]:
zk.delete(node)
node=zk.create("/sub-master",bytes(temp,'utf-8'),ephemeral=True)
else:
zk.delete(node)
node=zk.create("/zkslave/slave",bytes(temp,'utf-8'),ephemeral=True, sequence=True)
sync()
bkpsync()
def update(cnode):
temp=str(ipaddr)+"+"+rval()
global node
node=zk.create(cnode,bytes(temp,'utf-8'),ephemeral=True)
def findStorageNode(search):
global missing
global f
with open("conf.txt", "r") as f:
range_val = f.readline()
bkp_range_val=f.readline()
first=range_val.split("-")[0]
last=range_val.split("-")[1]
last=last.splitlines()[0]
bkp_first=bkp_range_val.split("-")[0]
bkp_last=bkp_range_val.split("-")[1]
bkp_last=bkp_last.splitlines()[0]
if first<=search<=last:
return True
elif bkp_first<=search<=bkp_last:
f=2
for x in missing:
mfirst=x.split("-")[0]
mlast=x.split("-")[1]
print("Found in backup")
if mfirst<=search<=mlast:
print("Returned by backup")
f=1
return True
else:
return False
return False
if __name__ == '__main__':
from http.server import HTTPServer
from kazoo.client import KazooClient
#---------------------------------------------------------
f=0
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.connect(("192.168.43.228",80))
ipaddr=s.getsockname()[0]
zk = KazooClient(hosts='192.168.43.228:2181')
#zk = KazooClient(hosts="127.0.0.1:2181")
zk.start()
active=[]
missing=[]
node=zk.create("/zknode",b"junkdata",ephemeral=True,sequence=True)
init()
@zk.ChildrenWatch("/")
def lead(children):
global node
time.sleep(5)
s=zk.get_children("/zkslave")
if len(s)>0 and not (zk.exists("/master")):
print (node)
print(s)
s.sort()
if node=="/zkslave/"+s[0]:
zk.delete(node)
node="/master"
update("/master")
update("/zkslave/master")
print("master died, new master created")
@zk.ChildrenWatch("/zkslave")
def slav(children):
global node
global active
global missing
if len(children)==0:
print("no slaves online")
return
children=list(map(lambda x: zk.get("/zkslave/"+x)[0].decode('utf-8'),children))
children=list(map(lambda x: x.split("+")[1],children))
if len(children)>len(active):
active=children
print("server online")
return
elif len(children)<len(active):
missing=list(set(active)-set(children))
ser(missing)
return
def ser(missing):
for x in missing:
mfirst=x.split("-")[0]
mlast=x.split("-")[1]
with open("conf.txt", "r") as f:
r_val = f.readline()
range_val=f.readline()
first=range_val.split("-")[0]
last=range_val.split("-")[1]
last=last.splitlines()[0]
if mfirst==first and mlast==last:
print("Server for "+mfirst+"-"+ mlast+" went down:Backup found")
else:
print("Server for "+mfirst+"-"+ mlast+" went down, Checking other nodes")
#---------------------------------------------------------
host = ipaddr
#host="127.0.0.1"
port = 8000
#port=8100
server = HTTPServer((host, port), handleRequests)
server.serve_forever()