/__pycache__/

^\..*

^certs/

{

	"hosts": ["127.0.0.1"],

	"batchSize": 256

}

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,hashBlock

class Connection(BaseConnection):

	def __init__(self,host,port):

		super().__init__()

		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)

		try:

			self._socket.connect((host,port))

		self.createNetworkers()

class Client(NetNode):

	def __init__(self,filename,treeFile=""):

		print(datetime.now(), "initializing...")

		super().__init__(filename,treeFile)

	## Asks server for node hashes to determine which are to be transferred.

	#

	# Uses a binary HashTree, where item at k is hash of items at 2k+1, 2k+2.

	#

	# Requests nodes in order of a batch DFS. Needs stack of size O(treeDepth*batchSize). Nodes in each tree level are accessed in order.

	def negotiate(self):

		localTree=self._tree

		blocksToTransfer=[]

		nodeStack=collections.deque([0]) # root

		# initialize session

		jsonData={"command":"init", "blockSize":localTree.BLOCK_SIZE, "blockCount":localTree.leafCount, "version":conf.version}

		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:

			indices=[]

			for i in range(conf.batchSize):

				indices.append(nodeStack.pop())

				if len(nodeStack)==0: break

			self._outcoming.writeMsg({"command":"req", "index":indices, "dataType":"hash"})

			jsonData,binData=self._incoming.readMsg()

			assert jsonData["index"]==indices

			assert jsonData["dataType"]=="hash"

			stats.logExchangedNode(len(indices))

			frontier=[]

			for (j,i) in enumerate(indices):

				(j1,j2)=[HashTree.HASH_LEN*ji for ji in (j,j+1)]

				if localTree.store[i]!=binData[j1:j2]:

					# ie. 0-6 nodes, 7-14 leaves. 2*6+2<15

					if 2*i+2<len(localTree.store): # inner node

						frontier.append(2*i+1)

						frontier.append(2*i+2)

					else:

						blocksToTransfer.append(i-localTree.leafStart) # leaf

import sys

import os.path

import logging as log

from argparse import ArgumentParser

from util import spawnDaemon, splitHost

import config as conf

import stats

from hashtree import HashTree

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)

	if os.path.isfile(args.treefile):

		treeMod=os.stat(args.treefile).st_mtime

		dataMod=os.stat(args.datafile).st_mtime

		if dataMod<treeMod and not args.force:

			print("tree file is up to date")

			return

	tree=HashTree.fromFile(args.datafile)

	tree.save(args.treefile)

def push(args):

	_checkFile(args.datafile)

	if args.tree:

		_checkFile(args.tree)

	if args.host: conf.hosts=[args.host]

	if args.port: conf.port=args.port

	c=Client(args.datafile,args.tree)

			c.setConnection(con)

			blocksToTransfer=c.negotiate()

			c.sendData(blocksToTransfer)

		print()

		print(stats.report())

def pull(args):

	_checkFile(args.datafile)

	if args.tree:

		_checkFile(args.tree)

	if args.host: conf.hosts=[args.host]

	if args.port: conf.port=args.port

	c=Client(args.datafile,args.tree)

		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=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("-f","--force",action="store_true",help="force tree rebuild")

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")

pUpdate.add_argument("-t","--tree",help="stored hash tree location")

pUpdate.add_argument("datafile")

pUpdate.set_defaults(func=push)

pUpdate=subparsers.add_parser("pull")

pUpdate.add_argument("-p","--port",type=int)

pUpdate.add_argument("-t","--tree",help="stored hash tree location")

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")

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)

import socket

import logging as log

from networkers import NetworkReader,NetworkWriter

from hashtree import HashTree

class BaseConnection: # abstract

	def __init__(self):

		self._socket=None

		self.incoming=None

		self.outcoming=None

	def createNetworkers(self):

		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):

		try:

			self._socket.shutdown(socket.SHUT_RDWR)

			self._socket.close()

		except OSError:

			log.warning("broken connection")

class NetNode:

	def __init__(self,filename,treeFile=""):

		self._incoming=None

		self._outcoming=None

		self._filename=filename

		self._treeFile=treeFile

		if treeFile:

			self._tree=HashTree.load(treeFile)

		else:

			self._tree=HashTree.fromFile(filename)

		self._newLeaves=dict()

	def _updateTree(self):

		log.info("updating hash tree...")

		for (k,v) in self._newLeaves.items():

			self._tree.updateLeaf(k, v)

		self._tree.save(self._treeFile)