Morevna Changeset - 6c8e994fd906

Changeset - 6c8e994fd906

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Laman - 7 years ago 2017-10-18 16:22:02

using just one socket, server saving memory when not serving

3 files changed with 68 insertions and 47 deletions:

src/client.py

src/morevna.py

src/server.py

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src/client.py

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 import collections
 import socket
 import ssl
 import logging as log
 from datetime import datetime
 import config as conf
 import stats
 from util import Progress
 from hashtree import HashTree
 from networkers import NetworkReader,NetworkWriter
 class Connection:
-	def __init__(self,sslContext):
 	def __init__(self):
 		sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 		sslContext=ssl.create_default_context(cafile=conf.peers)
 		sslContext.check_hostname=False
 		sslContext.load_cert_chain(conf.certfile,conf.keyfile)
 		self._socket=sslContext.wrap_socket(sock)
 		self._socket.connect((conf.hosts[0], conf.port))
 		fr=self._socket.makefile(mode="rb")
 		fw=self._socket.makefile(mode="wb")
 		self.incoming=NetworkReader(fr)
 		self.outcoming=NetworkWriter(fw)
 	def __enter__(self):
 		return self.incoming,self.outcoming
 	def __exit__(self, exc_type, exc_val, exc_tb):
 		self._socket.shutdown(socket.SHUT_RDWR)
 		self._socket.close()
 class Client:
 	def __init__(self,filename):
 		self._incoming=None
 		self._outcoming=None
 		self._filename=filename
 		self._ssl=ssl.create_default_context(cafile=conf.peers)
 		self._ssl.check_hostname=False
 		self._ssl.load_cert_chain(conf.certfile,conf.keyfile)
 		print(datetime.now(), "initializing...")
 		self._localTree=HashTree.fromFile(self._filename)
 	def negotiate(self):
 		print(datetime.now(), "initializing...")
 		localTree=HashTree.fromFile(self._filename)
 		localTree=self._localTree
 		blocksToTransfer=[]
 		nodeStack=collections.deque([0]) # root
 		# initialize session
 		with Connection(self._ssl) as (incoming,outcoming):
 			jsonData={"command":"init", "blockSize":localTree.BLOCK_SIZE, "blockCount":localTree.leafCount, "version":conf.version}
 			outcoming.writeMsg(jsonData)
 			jsonData,binData=incoming.readMsg()
 		self._outcoming.writeMsg(jsonData)
 		jsonData,binData=self._incoming.readMsg()
 			assert jsonData["command"]=="ack"
 			# determine which blocks to send
 			print(datetime.now(), "negotiating:")
 			progress=Progress(localTree.leafCount)
 			while len(nodeStack)>0:
 				i=nodeStack.pop()
-				outcoming.writeMsg({"command":"req", "index":i, "dataType":"hash"})
+			self._outcoming.writeMsg({"command":"req", "index":i, "dataType":"hash"})
-				jsonData,binData=incoming.readMsg()
+			jsonData,binData=self._incoming.readMsg()
 				assert jsonData["index"]==i
 				assert jsonData["dataType"]=="hash"
 				stats.logExchangedNode()
 				if localTree.store[i]!=binData:
 					if 2*i+3<len(localTree.store): # inner node
 						nodeStack.append(2*i+2)
 						nodeStack.append(2*i+1)
 					else:
 						blocksToTransfer.append(i-localTree.leafStart) # leaf
 						progress.p(i-localTree.leafStart)
 		progress.done()
 		return blocksToTransfer
 	def sendData(self,blocksToTransfer):
 		log.info(blocksToTransfer)
 		dataFile=open(self._filename, mode="rb")
 		i1=-1
 		print(datetime.now(), "sending data:")
 		with Connection(self._ssl) as (incoming,outcoming):
 			progress=Progress(len(blocksToTransfer))
 			for (k,i2) in enumerate(blocksToTransfer):
 				jsonData={"command":"send", "index":i2, "dataType":"data"}
 				if i1+1!=i2:
 					dataFile.seek(i2*HashTree.BLOCK_SIZE)
 				binData=dataFile.read(HashTree.BLOCK_SIZE)
 				log.info("block #{0}: {1}...{2}".format(i2,binData[:5],binData[-5:]))
-				outcoming.writeMsg(jsonData,binData)
+			self._outcoming.writeMsg(jsonData,binData)
 				stats.logTransferredBlock()
-				jsonData,binData=incoming.readMsg()
+			jsonData,binData=self._incoming.readMsg()
 				assert jsonData["command"]=="ack" and jsonData["index"]==i2, jsonData
 				i1=i2
 				progress.p(k)
 		progress.done()
 		with Connection(self._ssl) as (incoming,outcoming):
 			outcoming.writeMsg({"command":"end"})
 		self._outcoming.writeMsg({"command":"end"})
 		log.info("closing session...")
 		dataFile.close()
 	def pullData(self,blocksToTransfer):
 		log.info(blocksToTransfer)
 		dataFile=open(self._filename, mode="rb+")
 		i1=-1
 		print(datetime.now(), "receiving data:")
 		with Connection(self._ssl) as (incoming,outcoming):
 			progress=Progress(len(blocksToTransfer))
 			for (k,i2) in enumerate(blocksToTransfer):
 				outcoming.writeMsg({"command":"req", "index":i2, "dataType":"data"})
 				jsonData,binData=incoming.readMsg()
 			self._outcoming.writeMsg({"command":"req", "index":i2, "dataType":"data"})
 			jsonData,binData=self._incoming.readMsg()
 				assert jsonData["command"]=="send" and jsonData["index"]==i2 and jsonData["dataType"]=="data", jsonData
 				if i1+1!=i2:
 					dataFile.seek(i2*HashTree.BLOCK_SIZE)
 				dataFile.write(binData)
 				log.info("block #{0}: {1}...{2}".format(i2,binData[:5],binData[-5:]))
 				stats.logTransferredBlock()
 				i1=i2
 				progress.p(k)
 		progress.done()
 		with Connection(self._ssl) as (incoming,outcoming):
 			outcoming.writeMsg({"command":"end"})
 		self._outcoming.writeMsg({"command":"end"})
 		log.info("closing session...")
 		dataFile.close()
 	def setConnection(self,connection):
 		(self._incoming,self._outcoming)=connection

src/morevna.py

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 import sys
 import os.path
 import logging as log
 from argparse import ArgumentParser
 from util import spawnDaemon
 import config as conf
 import stats
 from hashtree import HashTree
 from client import Client
 from server import Server
 from client import Client, Connection as ClientConnection
 from server import Miniserver
 def _checkFile(f):
 	if not os.path.isfile(f):
 		print("invalid file specified:",f,file=sys.stderr)
 		sys.exit(1)
 def buildTree(args):
 	_checkFile(args.datafile)
 	tree=HashTree.fromFile(args.datafile)
 	tree.save(args.treefile)
 def push(args):
 	_checkFile(args.datafile)
 	if args.host: conf.hosts.insert(0,args.host)
 	if args.port: conf.port=args.port
 	c=Client(args.datafile)
 	with ClientConnection() as con:
 		c.setConnection(con)
 	blocksToTransfer=c.negotiate()
 	c.sendData(blocksToTransfer)
 	print()
 	print(stats.report())
 def pull(args):
 	_checkFile(args.datafile)
 	if args.host: conf.hosts.insert(0,args.host)
 	if args.port: conf.port=args.port
 	c=Client(args.datafile)
 	with ClientConnection() as con:
 		c.setConnection(con)
 	blocksToTransfer=c.negotiate()
 	c.pullData(blocksToTransfer)
 	print()
 	print(stats.report())
 def serve(args):
 	_checkFile(args.datafile)
 	if args.tree:
 		_checkFile(args.tree)
 	if args.host: conf.hosts.insert(0,args.host)
 	if args.port: conf.port=args.port
-	s=Server(args.datafile,args.tree)
+	s=Miniserver(args.datafile,args.tree)
 	try:
 		spawnDaemon(s.serve)
 	except Exception as e:
 		log.exception("exception: %s",e)
 parser=ArgumentParser()
 subparsers=parser.add_subparsers()
 pBuild=subparsers.add_parser("build")
 pBuild.add_argument("treefile", help="stored hash tree location")
 pBuild.add_argument("datafile")
 pBuild.set_defaults(func=buildTree)
 pUpdate=subparsers.add_parser("push")
 pUpdate.add_argument("-p","--port",type=int)
 pUpdate.add_argument("--host",default="127.0.0.1")
 pUpdate.add_argument("datafile")
 pUpdate.set_defaults(func=push)
 pUpdate=subparsers.add_parser("pull")
 pUpdate.add_argument("-p","--port",type=int)
 pUpdate.add_argument("--host",default="127.0.0.1")
 pUpdate.add_argument("datafile")
 pUpdate.set_defaults(func=pull)
 pServe=subparsers.add_parser("serve")
 pServe.add_argument("-p","--port",type=int)
 pServe.add_argument("--host",default="")
 pServe.add_argument("-t","--tree",help="stored hash tree location")
 pServe.add_argument("datafile")
 pServe.set_defaults(func=serve)
 args=parser.parse_args()
 args.func(args)

src/server.py

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 import hashlib
 import socket
 import ssl
 import multiprocessing
 import logging as log
 from hashtree import HashTree
 from networkers import NetworkReader,NetworkWriter
 import config as conf
 class Connection:
 	def __init__(self,serverSocket,sslContext):
 		sock, address = serverSocket.accept()
 		self._socket=sslContext.wrap_socket(sock,server_side=True)
 		log.info('Connected by {0}'.format(address))
 		fr=self._socket.makefile(mode="rb")
 		fw=self._socket.makefile(mode="wb")
 		self.incoming=NetworkReader(fr)
 		self.outcoming=NetworkWriter(fw)
 	def __enter__(self):
 		return self.incoming,self.outcoming
 	def __exit__(self, exc_type, exc_val, exc_tb):
 		self._socket.shutdown(socket.SHUT_RDWR)
 		self._socket.close()
-class Server:
+class Miniserver:
 	def __init__(self,filename,treeFile=""):
 		self._filename=filename
 		self._treeFile=treeFile
 		self._locked=False
 		if treeFile:
 			self._tree=HashTree.load(treeFile)
 		else:
 			self._tree=HashTree.fromFile(filename)
 		self._newLeaves=dict()
 		self.BLOCK_SIZE=self._tree.BLOCK_SIZE
 		self._ssl=ssl.create_default_context(ssl.Purpose.CLIENT_AUTH,cafile=conf.peers)
 		self._ssl.verify_mode=ssl.CERT_REQUIRED
 		self._ssl.load_cert_chain(conf.certfile,conf.keyfile)
 		self._ss = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 		self._ss.bind(("", conf.port))
 		self._ss.listen(1)
 	def serve(self):
 		while True:
 			with Connection(self._ss,self._ssl) as c:
 				p=multiprocessing.Process(target=Server.run,args=(c,self._filename,self._treeFile))
 				p.start()
 				p.join()
 class Server:
 	def __init__(self,connection,filename,treeFile=""):
 		(self._incoming,self._outcoming)=connection
 		self._filename=filename
 		self._treeFile=treeFile
 		if treeFile:
 			self._tree=HashTree.load(treeFile)
 		else:
 			self._tree=HashTree.fromFile(filename)
 		self._newLeaves=dict()
 		self.BLOCK_SIZE=self._tree.BLOCK_SIZE
 		self._lastIndex=-1
 		self._dataFileHandle=None
 	@staticmethod
 	def run(*args):
 		s=Server(*args)
 		s.serve()
 	@property
 	def _dataFile(self):
 		if not self._dataFileHandle:
 			self._dataFileHandle=open(self._filename, mode="rb+")
 		return self._dataFileHandle
 	def serve(self):
 		while True:
 			with Connection(self._ss,self._ssl) as (incoming, outcoming):
 				try:
 					while self._serveOne(incoming,outcoming):
 						pass
 				except AssertionError:
 					continue
 			while self._serveOne(): pass
 		except AssertionError as e:
 			log.warning(e)
 	def _serveOne(self,incoming,outcoming):
 		jsonData,binData=incoming.readMsg()
 	def _serveOne(self):
 		jsonData,binData=self._incoming.readMsg()
 		if jsonData["command"]=="init":
 			assert jsonData["blockSize"]==self.BLOCK_SIZE
 			assert jsonData["blockCount"]==self._tree.leafCount
 			self._locked=True
 			outcoming.writeMsg({"command": "ack"})
 			self._outcoming.writeMsg({"command": "ack"})
 		elif jsonData["command"]=="req":
 			if jsonData["dataType"]=="data":
-				outcoming.writeMsg(*self._requestData(jsonData["index"]))
+				self._outcoming.writeMsg(*self._requestData(jsonData["index"]))
 			else:
-				outcoming.writeMsg(*self._requestHash(jsonData["index"]))
+				self._outcoming.writeMsg(*self._requestHash(jsonData["index"]))
 		elif jsonData["command"]=="send" and jsonData["dataType"]=="data":
-			outcoming.writeMsg(*self._receiveData(jsonData,binData))
+			self._outcoming.writeMsg(*self._receiveData(jsonData,binData))
 		elif jsonData["command"]=="end":
 			self._finalize()
 			self._locked=False
 			return False
 		else:
 			assert False, jsonData["command"]
 		return True
 	def _requestHash(self,index):
 		log.info("received request for node #{0}".format(index))
 		assert index<len(self._tree.store)
 		nodeHash=self._tree.store[index]
 		jsonResponse={"command":"send", "index":index, "dataType":"hash"}
 		binResponse=nodeHash
 		return (jsonResponse,binResponse)
 	def _requestData(self,index):
 		log.info("received request for data block #{0}".format(index))
 		jsonResponse={"command":"send", "index":index, "dataType":"data"}
 		if self._lastIndex+1!=index:
 			self._dataFile.seek(index*self.BLOCK_SIZE)
 		binResponse=self._dataFile.read(self.BLOCK_SIZE)
 		return (jsonResponse,binResponse)
 	def _receiveData(self,jsonData,binData):
 		log.info("received data block #{0}: {1}...{2}".format(jsonData["index"],binData[:5],binData[-5:]))
 		i=jsonData["index"]
 		if self._lastIndex+1!=i:
 			self._dataFile.seek(i*self.BLOCK_SIZE)
 		self._dataFile.write(binData)
 		self._lastIndex=i
 		if self._treeFile:
 			self._newLeaves[i+self._tree.leafStart]=hashlib.sha256(binData).digest()[HashTree.HASH_LEN:]
 		return ({"command": "ack", "index": i},)
 	def _finalize(self):
 		log.info("closing session...")
 		self._dataFile.close()
 		self._dataFileHandle=None

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