79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
#
|
|
# Copyright (C) 2006 Alon Zakai ('Kripken') <kripkensteiner@gmail.com>
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2, or (at your option)
|
|
# any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
#
|
|
|
|
import time
|
|
|
|
# Global variables. Caching of saved data, mostly
|
|
|
|
old_peer_info = None
|
|
old_peer_info_timestamp = None
|
|
|
|
# Availability - how many complete copies are among our peers
|
|
def calc_availability(peer_info):
|
|
if len(peer_info) == 0:
|
|
return 0
|
|
|
|
num_pieces = len(peer_info[0].pieces)
|
|
|
|
freqs = [0]*num_pieces
|
|
|
|
for peer in peer_info:
|
|
for piece in num_pieces:
|
|
freqs[piece] = freqs[piece] + peer['pieces'][piece]
|
|
|
|
minimum = min(freqs)
|
|
# frac = freqs.count(minimum + 1) # Does this mean something?
|
|
|
|
return minimum
|
|
|
|
# Swarm speed - try to guess the speed of the entire swarm
|
|
# We return #pieces / second. The calling function should convert pieces to KB, if it wants
|
|
# Note that we return the delta from the last call. If the client calls too soon, this may
|
|
# be too unreliable. But the client can smooth things out, if desired
|
|
def calc_swarm_speed(peer_info):
|
|
if old_peer_info is not None:
|
|
new_pieces = 0
|
|
peers_known = 0
|
|
|
|
# List new peers
|
|
new_peer_IPs = {} # ip->peerinfo dict (from the core)
|
|
for peer in peer_info:
|
|
new_peer_IPs[peer['ip']] = peer
|
|
|
|
for new_IP in new_peer_IPs.keys():
|
|
if new_IP in old_peer_IPs.keys():
|
|
# We know this peer from before, see what changed
|
|
peers_known = peers_known + 1
|
|
delta = sum(new_peer_IPs[new_IP].pieces) - sum(old_peer_IPs[new_IP].pieces)
|
|
|
|
if delta >= 0:
|
|
new_pieces = new_pieces + delta
|
|
else:
|
|
print "Flood.stat.calc_swarm_speed: Bad Delta: ", delta, old_peer_IPs[new_IP].pieces, new_peer_IPs[new_IP].pieces
|
|
|
|
# Calculate final value
|
|
time_delta = time.time() - old_peer_info_timestamp
|
|
ret = float(new_pieces)/( float(peers_known) * time_delta )
|
|
|
|
# Save info
|
|
old_peer_info = peer_info
|
|
old_peer_info_timestamp = time.time()
|
|
old_peer_IPs = new_peer_IPs
|
|
|
|
return ret
|