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baranovperictourney.py
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baranovperictourney.py
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#!/usr/bin/python
# This is a dummy peer that just illustrates the available information your peers
# have available. The setup script will copy it to create the versions you edit
import random
import logging
from messages import Upload, Request
from util import even_split
from peer import Peer
class BaranovPericTourney(Peer):
def post_init(self):
print("post_init(): %s here!" % self.id)
##################################################################################
# Declare any variables here that you want to be able to access in future rounds #
##################################################################################
#This commented out code is and example of a python dictionsary,
#which is a convenient way to store a value indexed by a particular "key"
#self.dummy_state = dict()
#self.dummy_state["cake"] = "lie"
def requests(self, peers, history):
"""
peers: available info about the peers (who has what pieces)
history: what's happened so far as far as this peer can see
returns: a list of Request() objects
This will be called after update_pieces() with the most recent state.
"""
#Calculate the pieces you still need
needed = lambda i: self.pieces[i] < self.conf.blocks_per_piece
needed_pieces = list(filter(needed, list(range(len(self.pieces)))))
np_set = set(needed_pieces) # sets support fast intersection ops.
logging.debug("%s here: still need pieces %s" % (
self.id, needed_pieces))
#This code shows you what you have access to in peers and history
#You won't need it in your final solution, but may want to uncomment it
#and see what it does to help you get started
"""
logging.debug("%s still here. Here are some peers:" % self.id)
for p in peers:
logging.debug("id: %s, available pieces: %s" % (p.id, p.available_pieces))
logging.debug("And look, I have my entire history available too:")
logging.debug("look at the AgentHistory class in history.py for details")
logging.debug(str(history))
"""
requests = [] # We'll put all the things we want here
# Symmetry breaking is good...
random.shuffle(needed_pieces)
# count frequencies of all pieces that the other peers have
# this will be useful for implementing rarest first
###########################################################
# you'll need to write the code to compute these yourself #
###########################################################
frequencies = {}
# Python syntax to perform a sort using a user defined sort key
# This exact sort is probably not a useful sort, but other sorts might be useful
# peers.sort(key=lambda p: p.id)
# request all available pieces from all peers!
# (up to self.max_requests from each)
#############################################################################
# This code asks for pieces at random, you need to adapt it to rarest first #
#############################################################################
for peer in peers:
av_set = set(peer.available_pieces)
isect = av_set.intersection(np_set)
n = min(self.max_requests, len(isect))
# More symmetry breaking -- ask for random pieces.
# You could try fancier piece-requesting strategies
# to avoid getting the same thing from multiple peers at a time.
for piece_id in random.sample(isect, int(n)):
# aha! The peer has this piece! Request it.
# which part of the piece do we need next?
# (must get the next-needed blocks in order)
#
# If you loop over the piece_ids you want to request above
# you don't need to change the rest of this code
start_block = self.pieces[piece_id]
r = Request(self.id, peer.id, piece_id, start_block)
requests.append(r)
return requests
def uploads(self, requests, peers, history):
"""
requests -- a list of the requests for this peer for this round
peers -- available info about all the peers
history -- history for all previous rounds
returns: list of Upload objects.
In each round, this will be called after requests().
"""
##############################################################################
# The code and suggestions here will get you started for the standard client #
# You'll need to change things for the other clients #
##############################################################################
round = history.current_round()
logging.debug("%s again. It's round %d." % (
self.id, round))
# One could look at other stuff in the history too here.
# For example, history.downloads[round-1] (if round != 0, of course)
# has a list of Download objects for each Download to this peer in
# the previous round.
if len(requests) == 0:
logging.debug("No one wants my pieces!")
chosen = []
bws = []
else:
logging.debug("Still here: uploading to a random peer")
########################################################################
# The dummy client picks a single peer at random to unchoke. #
# You should decide a set of peers to unchoke accoring to the protocol #
########################################################################
request = random.choice(requests)
chosen = [request.requester_id]
# Now that we have chosen who to unchoke, the standard client evenly shares
# its bandwidth among them
bws = even_split(self.up_bw, len(chosen))
# create actual uploads out of the list of peer ids and bandwidths
# You don't need to change this
uploads = [Upload(self.id, peer_id, bw)
for (peer_id, bw) in zip(chosen, bws)]
return uploads