Overhaul to a considerably more useful multiprocess state
This commit is contained in:
parent
8469ab7758
commit
7fcbf6f3fa
7 changed files with 222 additions and 166 deletions
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@ -7,5 +7,8 @@ zapp_binary(
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main = "src/python/aloe/__main__.py",
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deps = [
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":lib",
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py_requirement("graphviz"),
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py_requirement("icmplib"),
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py_requirement("requests"),
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],
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)
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@ -6,15 +6,19 @@ when packet delivery latencies radically degrade and maintain a report file.
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"""
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import sys
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import argparse
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import logging
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from collections import defaultdict, deque
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from datetime import datetime, timedelta
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from ping import ping
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from traceroute import TraceElem, traceroute
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from subprocess import CalledProcessError
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from typing import NamedTuple
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from collections import defaultdict
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import logging
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from multiprocessing import Process, Queue
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import queue
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import sys
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from typing import List
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from .lib import *
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import graphviz
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import requests
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log = logging.getLogger(__name__)
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@ -35,103 +39,156 @@ def distinct(iter):
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return l
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class Host(NamedTuple):
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hostname: str
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ip: str
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rank: int
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latency: timedelta
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samples: int = 1
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def mean_latency(self):
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return self.latency / self.samples
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class Topology(object):
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LOCALHOST = Host("localhost", "127.0.0.1", 0, timedelta(seconds=0.1))
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LOCALHOST = Hop("127.0.0.1", 1, [0.0], 0)
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def __init__(self):
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self._graph = defaultdict(set) # Dict[ip, List[ip]]
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self._nodes = {self.LOCALHOST.ip: self.LOCALHOST} # Dict[ip, Host]
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self._graph = defaultdict(set) # Dict[address, List[address]]
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self._nodes = {self.LOCALHOST.address: self.LOCALHOST} # Dict[address, Host]
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def next_hops(self, address: str) -> List[str]:
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return list(self._graph.get(address))
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def node(self, address: str) -> Hop:
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return self._nodes.get(address)
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def add_traceroute(self, trace):
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trace = list(trace)
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hosts = []
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newhosts = [self.LOCALHOST.ip]
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rank = 0
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for e in trace:
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if e.ip not in self._nodes:
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self._nodes[e.ip] = Host(e.hostname, e.ip, e.rank, e.latency, 1)
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if e.address not in self._nodes:
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self._nodes[e.address] = e
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else:
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self._nodes[e.ip] = Host(e.hostname, e.ip, e.rank, e.latency + self._nodes[e.ip].latency, self._nodes[e.ip].samples + 1)
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e0 = self._nodes[e.address]
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e0._packets_sent += e._packets_sent
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e0._rtts.extend(e.rtts)
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e0._distance = max(e.distance, e0.distance)
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if e.rank > rank:
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if newhosts:
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for h2 in newhosts:
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for h1 in hosts:
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self._graph[h1].add(h2)
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hosts = newhosts
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newhosts = []
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rank = e.rank
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hosts = [(self.LOCALHOST.address, self.LOCALHOST.distance)] + [(e.address, e.distance) for e in trace]
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i1 = iter(hosts)
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i2 = iter(hosts)
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next(i2)
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if e.rank == rank:
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newhosts.append(e.ip)
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for (parent, _), (child, _) in zip(i1, i2):
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self._graph[parent].add(child)
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def render(self):
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for n in sorted(self._nodes.values(), key=lambda n: n.rank):
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print(f"{n.hostname} ({n.ip}) => {self._graph[n.ip]}")
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g = graphviz.Digraph()
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for n in sorted(self._nodes.values(), key=lambda n: n.distance):
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g.node(n.address)
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for next in self._graph[n.address]:
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g.edge(n.address, next)
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# Lol. Lmao.
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return requests.post("https://dot-to-ascii.ggerganov.com/dot-to-ascii.php", params={"boxart":1, "src": g.source}).text
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# return g.source
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def compute_topology(hostlist):
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def __iter__(self):
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return iter(sorted(self._nodes.values(), key=lambda n: n.distance))
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def __delitem__(self, key):
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del self._graph[key]
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del self._nodes[key]
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def compute_topology(hostlist, topology=None):
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"""Walk a series of traceroute tuples, computing a 'worst expected latency' topology from them."""
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topology = Topology()
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topology = topology or Topology()
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for h in hostlist:
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topology.add_traceroute(traceroute(h))
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trace = traceroute(h)
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# Restrict the trace to hosts which ICMP ping
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trace = [e for e in trace if ping(e.address, count=1).is_alive]
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topology.add_traceroute(trace)
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return sorted(topology._nodes.values(), key=lambda n: n.rank)
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return topology
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def cycle(iter):
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while True:
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for e in iter:
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yield e
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def pinger(host, id, queue):
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# Mokney patch the RTT tracking
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host._rtts = deque(host._rtts, maxlen=100)
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while True:
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timeout = h.avg_rtt * 2 / 1000.0 # rtt is in ms but timeout is in sec.
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start = datetime.now()
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res = ping(host.address, id=id, timeout=timeout, count=3)
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queue.put((start, res))
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if res.is_alive:
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host._rtts.extend(res._rtts)
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host._packets_sent += res._packets_sent
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if __name__ == "__main__":
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logging.basicConfig(level=logging.INFO)
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logging.basicConfig(level=logging.DEBUG)
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opts, args = parser.parse_known_args()
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now = start = datetime.now()
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reconfigure_delay = timedelta(minutes=5)
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configure_at = now - reconfigure_delay
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flush_delay = timedelta(seconds=5)
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flush_at = now + flush_delay
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topology = []
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recovered_duration = timedelta(seconds=5)
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dead_duration = timedelta(seconds=30)
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topology = None
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id = unique_identifier()
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q = Queue()
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workers = {}
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last_seen = {}
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spinner = cycle("|/-\\")
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with open("incidents.txt", "a") as fp:
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while True:
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now = datetime.now()
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if flush_at <= now:
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fp.flush()
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flush_at = now + flush_delay
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if configure_at <= now:
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log.info("Attempting to reconfigure network topology...")
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try:
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topology = compute_topology(opts.hosts)
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topology = compute_topology(opts.hosts, topology)
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configure_at = now + reconfigure_delay
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for h in topology:
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log.info(f"in topology {h}")
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except CalledProcessError:
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pass
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log.info("Graph -\n" + topology.render())
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for h in topology:
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if h.rank == 0:
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if h.distance < 1 or h.distance > 6:
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continue
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fail = False
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try:
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if ping(h.ip, timeout=h.mean_latency() * 2) != 0:
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fail = True
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except Exception as e:
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fail = True
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log.exception(e)
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if fail:
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msg = f"{datetime.now()} failed to reach {h.hostname} ({h.ip})"
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log.warning(msg)
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fp.write(msg + "\n")
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if h.address in workers:
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continue
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else:
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sys.stderr.write('.')
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p = workers[h.address] = Process(target=pinger, args=(h, id, q))
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p.start()
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try:
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timestamp, res = q.get(timeout=0.1)
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last = last_seen.get(res.address)
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if res.address not in workers:
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pass
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elif res.is_alive:
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if last and (delta := timestamp - last) > recovered_duration:
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fp.write(f"RECOVERED\t{res.address}\t{timestamp.isoformat()}\t{delta.total_seconds()}\n")
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last_seen[res.address] = timestamp
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elif not res.is_alive:
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if last and (delta := timestamp - last) > dead_duration:
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workers[h.address].terminate()
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del workers[h.address]
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del topology[h.address]
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fp.write(f"DEAD\t{res.address}\t{timestamp.isoformat()}\t{delta.total_seconds()}\n")
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else:
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fp.write(f"DOWN\t{res.address}\t{timestamp.isoformat()}\n")
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except queue.Empty:
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sys.stderr.write("\r" + next(spinner))
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sys.stderr.flush()
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91
projects/aloe/src/python/aloe/lib.py
Normal file
91
projects/aloe/src/python/aloe/lib.py
Normal file
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@ -0,0 +1,91 @@
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#!/usr/bin/env python3
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import logging
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from time import sleep
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from icmplib import Hop
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from icmplib.exceptions import (
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ICMPLibError,
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TimeExceeded,
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)
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from icmplib.models import Hop, ICMPRequest
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from icmplib.sockets import (
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ICMPv4Socket,
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ICMPv6Socket,
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)
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from icmplib.utils import *
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log = logging.getLogger(__name__)
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def urping(address: str, hops: int, via: str, family=None, count=3, fudge=4, interval=0.05, timeout=2, source=None, **kwargs) -> Hop:
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"""Ur-ping by (ab)using ICMP TTLs.
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Craft an ICMP message which would go one (or more) hops FARTHER than the `address` host, routed towards `via`.
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Send `count * fudge` packets, looking for responses from `address`.
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Responses from `address` are considered; and a `Hop` is built from those results.
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Other responses from other hosts are discarded.
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"""
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if is_hostname(via):
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via = resolve(via, family)[0]
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if is_hostname(address):
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address = resolve(address, falmiy)[0]
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if is_ipv6_address(via):
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_Socket = ICMPv6Socket
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else:
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_Socket = ICMPv4Socket
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ttl = hops
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hop = Hop(address, 0, [])
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packets_sent = 0
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with _Socket(source) as sock:
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for _ in range(count * fudge):
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request = ICMPRequest(
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destination=via,
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# Note that we act like this is a new stream with a new ID and sequence each time to try and fool multipathing.
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id=unique_identifier(),
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sequence=0,
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ttl=ttl,
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**kwargs)
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try:
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sock.send(request)
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packets_sent += 1
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reply = None
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reply = sock.receive(request, timeout)
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rtt = (reply.time - request.time) * 1000
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reply.raise_for_status()
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except TimeExceeded:
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sleep(interval)
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except ICMPLibError as e:
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log.exception(e)
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break
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if not reply:
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log.debug(f"got no reply from {address}")
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else:
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# Because the default repr() is crap
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reply_str = "ICMPReply({})".format(", ".join(slot + "=" + str(getattr(reply, slot)) for slot in reply.__slots__))
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log.debug(f"Pinging {address} (distance {hops}) via {via} got reply {reply_str}")
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if reply and reply.source != address:
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continue
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elif reply:
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hop._packets_sent += 1
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hop._rtts.append(rtt)
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if hop and hop._packets_sent >= count:
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break
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return hop
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@ -1,18 +0,0 @@
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"""A shitty ping wrapper."""
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from datetime import timedelta
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from subprocess import check_call, DEVNULL
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def ping(host: str,
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count: int = 3,
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interval: float = 0.3,
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timeout: timedelta = timedelta(seconds=3)):
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return check_call(["ping", "-q",
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"-i", str(interval),
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"-c", str(count),
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"-W", str(timeout.total_seconds()),
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host],
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stdout=DEVNULL,
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stderr=DEVNULL,)
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@ -1,48 +0,0 @@
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"""A shitty traceroute wrapper."""
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from datetime import timedelta
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import re
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from subprocess import (
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CalledProcessError,
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check_call,
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check_output,
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DEVNULL,
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)
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from typing import Iterator, List, NamedTuple
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class TraceElem(NamedTuple):
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hostname: str
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ip: str
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latency: timedelta
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rank: int
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_LINE = re.compile(r"\*|(((?P<hostname>[-_\w\d\.]*)\s+\((?P<ip>[a-f\d\.:]*)\)\s+)?(?P<latency>[\d\.]*) ms)")
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def _parse_traceroute(lines: List[str]) -> Iterator[TraceElem]:
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for rank, l in zip(range(1, 1<<64), lines):
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ip = None
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hostname = None
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for m in re.finditer(_LINE, l):
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if m.group("latency"):
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ip = m.group("ip") or ip
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hostname = m.group("hostname") or hostname
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yield TraceElem(hostname, ip, timedelta(milliseconds=float(m.group("latency"))), rank)
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def traceroute(host: str, icmp=True, timeout=timedelta(seconds=5)) -> Iterator[TraceElem]:
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# FIXME: Make ICMP mode an option, not on always
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yield from _parse_traceroute(
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check_output(["traceroute",
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# Set wait; note use of total_seconds which is "real" valued.
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"-w", str(timeout.total_seconds()),
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# Use ICMP probes same as PING.
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# This means all probed hosts will be pingable/ping compliant.
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# May miss parts of the topology as a result.
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"-I",
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host],
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stderr=DEVNULL,)
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.decode("utf-8")
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.splitlines())
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@ -1,31 +0,0 @@
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#!/usr/bin/env python3
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from typing import List
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from traceroute import _parse_traceroute, TraceElem
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from datetime import timedelta
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import pytest
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def parse_traceroute(lines):
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"""Testing helper."""
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return list(_parse_traceroute(lines))
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@pytest.mark.parametrize("example, expected", [
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# Basic case, one match
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("3 10.60.142.2 (10.60.142.2) 117.502 ms",
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[TraceElem("10.60.142.2", "10.60.142.2", timedelta(milliseconds=117.502))]),
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# Multiple matches on one line
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("3 10.60.142.2 (10.60.142.2) 117.502 ms 10.60.142.3 (10.60.142.3) 75.624 ms 10.60.142.2 (10.60.142.2) 117.709 ms",
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[TraceElem("10.60.142.2", "10.60.142.2", timedelta(milliseconds=117.502)),
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TraceElem("10.60.142.3", "10.60.142.3", timedelta(milliseconds=75.624)),
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TraceElem("10.60.142.2", "10.60.142.2", timedelta(milliseconds=117.709))]),
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# Context sensitive case - traceroute doesn't always print the host & IP.
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("7 ae-501-ar01.denver.co.denver.comcast.net (96.216.22.130) 41.920 ms 41.893 ms 74.385 ms",
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[TraceElem("ae-501-ar01.denver.co.denver.comcast.net", "96.216.22.130", timedelta(milliseconds=41.920)),
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TraceElem("ae-501-ar01.denver.co.denver.comcast.net", "96.216.22.130", timedelta(milliseconds=41.893)),
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TraceElem("ae-501-ar01.denver.co.denver.comcast.net", "96.216.22.130", timedelta(milliseconds=74.385))]),
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])
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def test_examples(example: str, expected: List[TraceElem]):
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assert parse_traceroute(example.splitlines()) == expected
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@ -16,7 +16,9 @@ docutils==0.17
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ExifRead==2.3.2
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flake8==3.9.2
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Flask==2.0.1
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graphviz==0.18.2
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hypothesis==6.14.5
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icmplib==3.0.2
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idna==2.10
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imagesize==1.2.0
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importlib-metadata==4.0.1
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