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SimNode.py
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SimNode.py
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# Copyright (c) 2020, RISE Research Institutes of Sweden AB.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of the Institute nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
# Author: Nicolas Tsiftes <nicolas.tsiftes@ri.se>
import logging
import os
import secrets
import signal
import subprocess
import sys
import Protocol
class SimNodeType:
def __init__(self, name, path, args):
self.name = name
self.path = path
self.args = args
def __repr__(self):
return "NodeType " + self.name
class SimNode:
def __init__(self, simulation, node_type, node_id):
self.simulation = simulation
self.node_type = node_type
self.node_id = node_id
self.status = 0
self.reachable_nodes = list()
self.token = secrets.token_hex(32)
logging.info("Node {} initialized with token {}".format(
self.node_id, self.token))
def __repr__(self):
return "Node " + str(self.node_id)
def start(self):
logging.info("Starting node {}".format(self.node_id))
child_read_fd, self.write_fd = os.pipe()
self.read_fd, child_write_fd = os.pipe()
self.pid = os.fork()
sys.stderr.flush()
sys.stdout.flush()
if self.pid != 0:
# In the parent process.
os.close(child_read_fd)
os.close(child_write_fd)
self.proto = Protocol.Protocol(self)
else:
# In the child process.
os.dup2(child_read_fd, 0)
os.dup2(child_write_fd, 1)
os.dup2(child_write_fd, 2)
argv = self.node_type.args.split( )
argv.insert(0, self.node_type.path)
env = os.environ
env['PROCNET_URI'] = "tcp://localhost:14395"
env['PROCNET_AUTH_TOKEN'] = self.token
try:
os.execvpe(self.node_type.path, argv, env)
except FileNotFoundError:
os._exit(1)
def stop(self):
try:
os.kill(self.pid, signal.SIGQUIT)
except ProcessLookupError:
logging.info("Process with PID {} does not exist".format(self.pid))
try:
pid, status = os.waitpid(self.pid, 0)
kill_signal = (status >> 8) & 0xff
exit_status = status & 0xff
logging.info("Exited with code {} or signal {}".format(
exit_status,kill_signal))
except ChildProcessError:
logging.debug("Process with PID {} has already exited".format(
self.pid))
def make_reachable(self, node):
self.reachable_nodes.append(node)