/
storagenode.py
76 lines (61 loc) · 1.49 KB
/
storagenode.py
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import random
import httputil
import peerutil
import httplib
import util
import socket
class entry:
def __init__(self, key, value, time):
self.key = key
self.value = value
self.time = time
def __cmp__(self, other):
if other == None:
return -1
v = self.time - other.time
if v != 0: return v
return self.value.__cmp__(other.value)
def __str__(self):
return self.key + "=" + self.value + " (" + str(self.time) + ")"
data = {}
def get(request):
key = request.args.get("key")
if key == None:
return 501, "No key provided"
entry = data.get(key)
if entry == None:
return 204, "No value for key " + key
return 200, entry.value + "\n"
def set(request):
key = request.args.get("key")
if key == None:
return 501, "No key provided"
t = request.args.get("time")
if t == None:
return 501, "No time provided"
value = request.postdata
if value == None:
value = request.args.get("value")
if value == None:
return 501, "No value provided"
newentry = entry(key, value, float(t))
oldentry = data.get("key")
if oldentry == None or oldentry < newentry:
if oldentry != None:
print(oldentry + " is older than " + newentry)
data[key] = newentry
return 200, "Ok\n"
peer = peerutil.getpeer("node")
try:
server = httputil.createserver(peer.port(),
{
"get" : get,
"set" : set,
}
)
except socket.error:
print("Could not bind on port: " + str(peer.port()))
else:
print("Storage node serving on port: " + str(peer.port()))
peer.addself()
server.serve_forever()