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listen_state.py
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listen_state.py
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import json
import re
import select
import socket
from django.conf import settings
from django.core.serializers.json import DjangoJSONEncoder
from django.db.transaction import atomic
from django.utils.translation import gettext_lazy as _
from redis import StrictRedis
from ws4redis import settings as private_settings
from ws4redis.redis_store import RedisMessage
from generic.utils import print_debug, print_error, print_message, print_notice, print_warning
from generic.websocket import LabPublisher
from lab.models import ExerciseNode, ExerciseState, IRRNode, irr_goal_types, monitor_goal_types
channel_pattern = re.compile(rb'^server:(\d )/events$')
class StateConnection:
header = re.compile(r'^\*\*\*\*\*\[ (.*?) \]\*\*\*\*\*$')
def __init__(self, connection: socket.socket):
self.connection = connection
self.buffer = ''
self.uuid = None
self.node = None
self.current_section_name = None
self.current_section = ''
def collect_data(self):
data = self.connection.recv(1024)
if not data:
# The end
return False
self.buffer = data.decode('utf-8')
while True:
parts = self.buffer.split('\n', 1)
if len(parts) == 1:
# No newline, still building a line, done for now
return True
# We have a line! Store remainder and process the line
line = parts[0].rstrip()
self.buffer = parts[1]
# Check if a new section begins
match = self.header.match(line)
if match:
# First submit the previous section, if any
self.submit()
name = match.group(1)
if self.node and name == 'END':
print_debug(_('Submitted {node.name} state of {exercise.name}').format(section=name, node=self.node,
exercise=self.node.project))
self.current_section_name = None
else:
self.current_section_name = name
self.current_section = ''
else:
# Not a section start, so add to current section
self.current_section = line '\n'
@atomic
def submit(self):
# Remember
name = self.current_section_name
content = self.current_section
# Clear the state vars
self.current_section_name = None
self.current_section = ''
# Do we have any data?
if not name:
return
# Process
if name == 'UUID':
# This is the UUID of the node
self.uuid = content.strip().lower()
if not self.uuid:
# We can't do anything yet
return
if not self.node:
try:
self.node = ExerciseNode.objects.get(gns3_id=self.uuid)
except ExerciseNode.DoesNotExist:
print_error(_('Unable to submit {section} of {uuid}').format(section=name, uuid=self.uuid))
return
if name in monitor_goal_types or name in irr_goal_types:
state, created = ExerciseState.objects.select_for_update().get_or_create(defaults={
'state': content,
}, exercise_node=self.node, goal_type=name)
if state.state != content:
# State changed
state.state = content
state.save()
redis_publisher = LabPublisher(facility='{}/events'.format(self.node.project_id), broadcast=True)
redis_publisher.publish_message(RedisMessage(json.dumps({
'type': 'state',
'goal_type': name,
'node': self.node.id,
'content': content,
'ts': state.last_update,
}, cls=DjangoJSONEncoder)))
elif name in ['QUERY-RESULT', 'UPDATE-RESULT']:
redis_publisher = LabPublisher(facility='{}/events'.format(self.node.project_id), broadcast=True)
redis_publisher.publish_message(RedisMessage(json.dumps({
'type': 'irr-query-response' if name == 'QUERY-RESULT' else 'irr-update-response',
'node': self.node.id,
'request': 'irr-query' if name == 'QUERY-RESULT' else 'irr-update',
'response': content,
}, cls=DjangoJSONEncoder)))
elif name != 'UUID':
print_error(_("Unknown section name: [{}] from {}").format(name, self.uuid))
def send_message(self, data):
# We only know how to send messages to IIR nodes
if not self.node or not isinstance(self.node.template_node, IRRNode):
return
if data['type'] == 'irr-query':
self.connection.send(b"*****[ QUERY ]*****\n")
self.connection.send(data['query'].encode() b'\n')
self.connection.send(b"*****[ END ]*****\n")
elif data['type'] == 'irr-update':
self.connection.send(b"*****[ UPDATE ]*****\n")
self.connection.send(data['update'].encode() b'\n')
self.connection.send(b"*****[ END ]*****\n")
def fileno(self):
return self.connection.fileno()
def close(self):
return self.connection.close()
def run():
try:
print_notice(_("Listening for state updates on {addr}:{port}").format(
addr=settings.STATE_COLLECTOR['ADDRESS'],
port=settings.STATE_COLLECTOR['PORT'],
))
listen_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
listen_sock.setblocking(False)
listen_sock.bind((settings.STATE_COLLECTOR['ADDRESS'], settings.STATE_COLLECTOR['PORT']))
listen_sock.listen(128)
redis = StrictRedis(**private_settings.WS4REDIS_CONNECTION)
subscriber = redis.pubsub()
subscriber.psubscribe('server:*/events')
# noinspection PyProtectedMember
redis_fd = subscriber.connection._sock.fileno()
sockets = [listen_sock, redis_fd]
while sockets:
readable, writable, exceptional = select.select(sockets, [], [])
for s in readable:
if s is listen_sock:
connection, client_address = s.accept()
print_message("Incoming state connection from {addr}".format(addr=client_address))
connection.setblocking(False)
sockets.append(StateConnection(connection))
# Ask for ID
connection.send(b"*****[ ID ]*****\n")
connection.send(b"*****[ END ]*****\n")
continue
if s is redis_fd:
# Data from websocket to telnet
message = subscriber.parse_response()
msg_type = message.pop(0)
if msg_type != b'pmessage':
continue
pattern, channel, message = message
match = channel_pattern.match(channel)
if not match:
print_warning(_("Malformed channel name: {}").format(channel))
continue
exercise_id = int(match.group(1))
data = json.loads(message)
if 'type' not in data or 'node_id' not in data:
print_warning(_("Malformed terminal input: {}").format(message))
continue
if data['type'] not in ['irr-query', 'irr-update']:
# Not for us
continue
node_id = int(data['node_id'])
# Find the connection belonging to this exercise node
for sc in sockets:
if isinstance(sc, StateConnection) and sc.node and \
sc.node.project_id == exercise_id and sc.node.id == node_id:
break
else:
print_warning(_("No existing connection found for exercise {exercise} node {node}")
.format(exercise=exercise_id, node=node_id))
redis_publisher = LabPublisher(facility='{}/events'.format(exercise_id), broadcast=True)
redis_publisher.publish_message(RedisMessage(json.dumps({
'type': data['type'] '-response',
'node': node_id,
'response': 'Server is not yet available',
}, cls=DjangoJSONEncoder)))
continue
sc.send_message(data)
continue
result = s.collect_data()
if not result:
# End of connection
print_message("Lost state connection from {addr}".format(addr=s.connection.getpeername()))
sockets.remove(s)
s.close()
except Exception as e:
print_error(e)