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peers.py
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peers.py
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from time import time
from random import random
from collections import Counter
from peer import Peer
from utils import Every
# Tracks reliable neighbors
class TrackPeer(Peer):
def setup(self):
self.state["ping"] = {self.pid:{}}
self.timeout = None#5
self.pingint = Every(30, randomoffset=30)#TODO add random start timeshift
def get_knownpeers(self):
return set(list(self.state["ping"].keys())) | set([pid for kv in list(self.state["ping"].values()) for pid in list(kv.keys())])
def track(self):
# TODO: avoid mutual sends?
rtime = time()
if self.pingint:
#if len(self.recvarr)<5:
self.send({"type":"ping", "origin":self.pid, "data":self.state["ping"]})#[self.pid]
c = Counter()
for msg in self.recvarr:
c[msg["content"]["type"]] += 1
if len(self.recvarr) > 0:
msg = self.recvarr[0]
target = msg["target"]
source = msg["source"]
content = msg["content"]
if content["type"] == "ping" and content["origin"] != self.pid:
self.recvarr.pop(0)
#self.state["ping"][content["origin"]] = content["data"]
updates = 0
stale = 0
# TODO with moving/disconnecting peers, consider timeout even of those not sent
for key1, value1 in list(content["data"].items()):
for key2, value2 in list(value1.items()):
#print(key1, key2, value2)
if key1 not in self.state["ping"]:
self.state["ping"][key1] = {}
if key2 not in self.state["ping"][key1]:
self.state["ping"][key1][key2] = value2
updates += 1
else:
if value2["num"] > self.state["ping"][key1][key2]["num"]:
self.state["ping"][key1][key2] = value2
updates += 1
else:
stale += 1
#print("u:", updates, "s:", stale)
#this should inversely depend on range to eventual receiving node/sending node? every node should have the same chance
# local node info shouldn't saturate the local net
# check how many unknowns there are, perhaps good proxy
"""
knownpeers = self.get_knownpeers()
gossippeers = set(content["data"].keys()) | set([content["origin"]])
#print(gossippeers, knownpeers)
numunknowns = len(gossippeers.difference(knownpeers))
if numunknowns > 0:
print("unknowns:", numunknowns)
"""
# ocassionally sent unknown deltas only?
#if len(self.recvarr)<100 and ((numunknowns > 0 and random() < 1) or random()<0.05):#adjust probabilities with number of own peers, or "density" of locality
# self.send(msg["content"])
# TODO: send occassional updates to the *edge* of the known network
# This tracks all direct contacts, not just ping packets
if source != self.pid:
if source not in self.state["ping"][self.pid]:
#self.p("found", source)
self.state["ping"][self.pid][source] = {"first":rtime,"last":rtime,"num":1}
else:
self.state["ping"][self.pid][source]["last"] = rtime
self.state["ping"][self.pid][source]["num"] += 1
if self.timeout:
for peer in list(self.state["ping"][self.pid]):
if rtime-self.state["ping"][self.pid][peer]["last"] > self.timeout:
#self.p("lost", peer)
del self.state["ping"][self.pid][peer]
if self.statint:
#self.p("Peers:{} Knows:{}".format(len(self.state["ping"][self.pid]), len(self.state["ping"])-1))
#self.p(self.state["ping"])
pass
def update(self):
self.track()
class GraphPeer(TrackPeer):
def setup(self):
super(GraphPeer, self).setup()
self.pingint.interval = 2+random()
# Finds a route, not necessarily the best
def route(self, target, node=None, path=[], visited=[]):
if node is None:
node = self.pid
if node == target:
return [target]
if not node in self.state["ping"]:
return
visited = list(visited)+[node]
for peer in list(self.state["ping"][node]):
if peer in visited:
return
result = self.route(target, peer, path, visited)
if result:
return [node]+result
def update(self):
if len(self.flagin)>0:
flag = self.flagin.pop(0)
if flag["target"] == self.pid:
self.flagout.append(flag)
else:
self.recvarr.append({"target":flag["target"], "source":self.pid, "content":flag})
self.track()
#if len(self.recvarr) > 10:
# self.recvarr = [msg for i, msg in enumerate(self.recvarr) if msg["content"]["type"]!="ping" or i<10]
if len(self.recvarr)==0 or self.recvarr[0]["content"]["type"] == "ping":
return
#self.p(self.state)
msg = self.recvarr.pop(0)
retry = False
target = msg["target"]
source = msg["source"]
content = msg["content"]
if content["type"] == "flag" and content["target"] == self.pid:
self.flagout.append(content)
else:
if "target" in content:
path = self.route(content["target"])
if path:
#self.p("route", path, target, msg)
if "hop" in content:
content["hop"] += 1
self.send(content, target=path[1])
else:
retry = True
else:
self.send(content)
if retry:
self.recvarr.append(msg)
class EmptyPeer(Peer):
def setup(self):
pass
def update(self):
self.p(self.recvarr)
self.recvarr = []
self.send("test")
# Implements basic packet flooding mechanism, does not resend packets with same seq number
class FloodPeer(TrackPeer):
def setup(self):
super(FloodPeer, self).setup()
self.state["seq"] = {}
def update(self):
#self.track()
if len(self.flagin)>0:
flag = self.flagin.pop(0)
if flag["target"] == self.pid:
self.flagout.append(flag)
else:
self.send(flag)
if len(self.recvarr) > 0:
msg = self.recvarr.pop(0)
target = msg["target"]
source = msg["source"]
content = msg["content"]
#if content["type"] != "ping":
if content.get("target") == self.pid:
#if target == self.pid:
# print(content)#"RECEIVED TARGETED PACKET")
self.flagout.append(content)
elif "seq" in msg:
#print(msg)
seq = msg["seq"]
# Might not receive packets in order!
"""
if self.state["seq"].get(source, -1) < seq:
self.state["seq"][source] = seq
"""
# Should use bloom filter here
if source not in self.state["seq"]:
self.state["seq"][source] = []
if seq not in self.state["seq"][source]:
self.state["seq"][source].append(seq)
if content.get("target") in self.state["ping"]:
self.send(content, target=content["target"], seq=msg["seq"])
#self.p("TARGETED PACKET", content)
else:
self.send(content, seq=msg["seq"])
#self.p("UNTARGETED PACKET")
# TODO BloomFilterGossip