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node.py
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node.py
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import os
import random
import sys
import re
import socket
import time
from npf.executor.localexecutor import LocalExecutor
from npf.executor.sshexecutor import SSHExecutor
from npf.variable import Variable,get_bool
from npf.nic import NIC
from npf.executor.executor import Executor
from npf import npf
class Node:
"""
Class representing a node (a host that will run experiments)
"""
_nodes = {}
def __init__(self, name, executor : Executor, tags):
self.executor = executor
self.name = name
self._nics = []
self.tags = []
self.nfs = True
self.addr = 'localhost'
self.port = 22
self.arch = ''
self.active_nics = range(32)
self.multi = None
self.mode = "bash"
# Always fill 32 random nics address that will be overwriten by config eventually
self._gen_random_nics()
clusterFileName = f'cluster/{name}' + (
'.node' if not name.endswith(".node") else ""
)
try:
clusterFilePath = npf.find_local(clusterFileName, critical=False)
self.path = clusterFilePath
f = open(clusterFilePath, 'r')
for i, line in enumerate(f):
line = line.strip()
if not line or re.match("^\\s*(#|//)", line):
continue
match = re.match(r'((?P<tag>[a-zA-Z]+[a-zA-Z0-9]*):)?(?P<nic_idx>[0-9]+):(?P<type>' + NIC.TYPES + ')=(?P<val>[a-z0-9:_.-]*)', line,
re.IGNORECASE)
if match:
if match.group('tag') and not match.group('tag') in tags:
continue
self._nics[int(match.group('nic_idx'))][match.group('type')] = match.group('val')
continue
match = re.match(r'(?P<var>' + Variable.ALLOWED_NODE_VARS + ')=(?P<val>.*)', line,
re.IGNORECASE)
if match:
if match.group('var') == 'nfs':
self.nfs = get_bool(match.group('val'))
setattr(executor, match.group('var'), match.group('val'))
continue
raise Exception("%s:%d : Unknown node config line %s" % (clusterFilePath, i, line))
self.parsed = True
except FileNotFoundError as e:
print(
f"{clusterFilePath} could not be found, we will connect to {name} with SSH using default parameters"
)
self.parsed = False
def get_nic(self, nic_idx):
if nic_idx >= len(self.active_nics):
raise Exception("ERROR: node %s has no nic number %d. Description file %s was used." % (self.name, nic_idx, self.path))
return self._nics[self.active_nics[nic_idx]]
def get_name(self):
return self.name
def experiment_path(self):
return (self.executor.path) if self.executor.path else npf.experiment_path()
@staticmethod
def _addr_gen():
mac = [0xAE, 0xAA, 0xAA,
random.randint(0x01, 0x7f),
random.randint(0x01, 0xff),
random.randint(0x01, 0xfe)]
macaddr = ':'.join(map(lambda x: "%02x" % x, mac))
ip = [10, mac[3], mac[4], mac[5]]
mac6 = mac[0:3] + [0xff] + [0xfe] + mac[3:6]
ip6 = [0x2001] + [0x0db8] + [0x0000]* 2 + [i * 0x100 + j for i,j in zip(mac6[::2], mac6[1::2])]
ipaddr = '.'.join(map(lambda x: "%d" % x, ip))
ip6addr = ':'.join((map(lambda x: "%x" % x, ip6)))
return macaddr, ipaddr, ip6addr
def _gen_random_nics(self):
for i in range(32):
mac, ip, ip6 = self._addr_gen()
nic = NIC(i, mac, ip, ip6, "eth%d" % i)
self._nics.append(nic)
def _find_nics(self):
if self.parsed:
return
print("Looking for NICs on %s..." % self.name)
if not npf.options.cluster_autosave:
print(
f"To avoid this message write down the configuration in cluster/{self.name}.node or run again NPF with --cluster-autosave to create the file automatically."
)
pid, out, err, ret = self.executor.exec(cmd="sudo lshw -class network -businfo -quiet", title="Listing network devices")
if ret != 0 or out == "" or out.isspace():
print(
f"WARNING: {self.name} has no configuration file and the NICs could not be found automatically. Please refer to the cluster documentation in NPF to define NIC order and addresses."
)
print(out)
return
eqpos = out.find('====')
header=out[:eqpos].splitlines()[-1]
descpos = header.find('Description') - 1
lines=out[out.find('===='):].splitlines()[1:]
speeds = {}
for line in lines:
line = line[:descpos].strip()
if not line:
continue
words = re.findall(r'\S+', line)
if len(words) < 3:
continue
pid, out, err, ret = self.executor.exec(cmd="echo \"SPEED=$( sudo ethtool %s | grep Speed | grep -oE '[0-9]+' )\"\necho \"MAC=$(cat /sys/class/net/%s/address)\"\necho \"IP=$( /sbin/ifconfig %s | grep 'inet addr:' | cut -d: -f2| cut -d' ' -f1 )\"" % (words[1], words[1], words[1]), title="Getting device %s info" % words[1])
res = re.findall("(SPEED|MAC|IP)=(.*)",out)
vals={}
for r in res:
vals[r[0]] = r[1].strip()
try:
ip = vals['IP'] or self._addr_gen()[1]
mac = vals['MAC']
speed = int(vals['SPEED'])
except IndexError:
print("Cannot find speed of %s" % words[1])
print(out)
speed=0
except ValueError:
print("Cannot parse speed of %s : %s" % (words[1], res[-3]))
speed=0
speeds.setdefault(speed, [])
nic = NIC(pci=words[0][4:], mac=mac, ip=ip, ip6="", ifname=words[1])
nic.speed = speed
speeds[speed].append(nic)
i = 0
conf=""
nl="\n"
for speed in reversed(sorted(speeds.keys())):
for n in speeds[speed]:
self._nics[i] = n
conf += "%d:pci=%s" % (i, n.pci) + nl
conf += "%d:ifname=%s" % (i, n.ifname) + nl
#print("%d:speed=%s" % (i, n.speed))
conf += "%d:mac=%s" % (i, n.mac) + nl
if n.ip:
conf += "%d:ip=%s" % (i, n.ip) + nl
i = i + 1
print(conf)
if npf.options.cluster_autosave and len(conf) > 0:
os.makedirs("cluster", exist_ok=True)
open("cluster/%s.node" % self.name, 'w').write(conf)
@classmethod
def makeLocal(cls, options, test_access = True):
node = cls._nodes.get('localhost', None)
if node is None:
node = Node('localhost', LocalExecutor(), options.tags)
cls._nodes['localhost'] = node
node.ip = '127.0.0.1'
if test_access:
pid, out, err, ret = node.executor.exec(cmd="pwd && test -e "+node.experiment_path() + ".access_test")
if ret != 0:
raise Exception("The local executor could not find the file created at %s. Check your --experiment-path argument! Current folder : %s" % ( node.experiment_path() + ".access_test", out+err) )
return node
@classmethod
def makeSSH(cls, user, addr, path, options, port=22, nfs=None):
if path is None:
path = os.path.abspath(npf.experiment_path())
node = cls._nodes.get(addr, None)
if node is not None:
return node
sshex = SSHExecutor(user, addr, path, port)
node = Node(addr, sshex, options.tags)
if nfs is not None:
node.nfs = nfs
cls._nodes[addr] = node
if options.do_test and options.do_conntest:
try:
node.ip = socket.gethostbyname(node.executor.addr)
except Exception as e:
print(f"Could not resolve hostname '{node.executor.addr}'")
raise(e)
print(f"Testing connection to {node.executor.addr}...")
time.sleep(0.01)
if not node.nfs:
print("Remote is not shared through nfs... Sending .access_test")
assert(isinstance(node.executor, SSHExecutor))
try:
node.executor.sendFolder(".access_test", local=npf.experiment_path())
except FileNotFoundError as e:
print(
f"While checking if file .access_test can be sent from local path {npf.experiment_path()} to remote {node.executor.addr}"
)
raise e
pid, out, err, ret = sshex.exec(cmd="pwd;test -e " + ".access_test" + " && echo 'access_ok' && if sudo whoami ; then echo 'sudo_ok' ; else echo 'sudo_fail' ; fi ; if ! type 'unbuffer' ; then echo \"installing expect...\" && ( ( sudo apt-get update && sudo apt-get install -y expect ) || sudo yum install -y expect ) fi ; ( ( type 'unbuffer' && echo 'unbuffer_ok' ) || echo 'unbuffer_fail' ) ; echo 'test'", raw=True, title="SSH dependencies installation")
out = out.strip()
if not node.nfs:
node.executor.deleteFolder(".access_test")
if ret != 0 or "access_ok" not in out:
#Something was wrong, try first with a more basic test to help the user pinpoint the problem
pidT, outT, errT, retT = sshex.exec(cmd="echo -n 'test'", raw=True, title="SSH echo test")
if retT != 0 or outT.strip().split("\n")[-1] != "test":
raise Exception(
"Could not communicate with%s node %s, got return code %d : %s"
% (
f" user {sshex.user}" if sshex.user else "",
sshex.addr,
retT,
outT + errT,
)
)
if "access_ok" not in out:
raise Exception(("Could not find the access test file at %s on %s. Verify the path= paramater in the cluster file and that this directory already exists. It must match --experiment-folder on the remote equivalent when nfs is active. If the path is not shared accross clusters, ensure you set nfs=0 in the cluster file.\n\nIf you think the above is not correct, please paste the output of the test script below to the github issues:\n" % (sshex.path, sshex.addr)) + "\n---" + out + err + "\n---")
if not "sudo_ok" in out:
print("WARNING : node %s does not seem tu support passwordless sudo." % sshex.addr)
sshex.sudo = False
if not "unbuffer_ok" in out:
sshex.unbuffer = False
if out.split("\n")[-1] != "test":
raise Exception("Could not communicate with user %s on node %s, unbuffer (expect package) could not be installed, or passwordless sudo is not working, got return code %d : %s" % (sshex.user, sshex.addr, ret, out + err))
if options.do_test:
try:
node._find_nics()
except Exception as e:
print(f"Error while trying to look for NICs on {node.name} : ", e)
return node