--- /dev/null
+#
+# NEPI, a framework to manage network experiments
+# Copyright (C) 2014 INRIA
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation;
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# Author: Alina Quereilhac <alina.quereilhac@inria.fr>
+
+import base64
+import pickle
+import errno
+import logging
+import os
+import socket
+import sys
+
+from optparse import OptionParser, SUPPRESS_HELP
+
+from nepi.resources.netns.netnswrapper import NetNSWrapper
+
+class NetNSWrapperMessage:
+ CREATE = "CREATE"
+ INVOKE = "INVOKE"
+ SET = "SET"
+ GET = "GET"
+ FLUSH = "FLUSH"
+ SHUTDOWN = "SHUTDOWN"
+
+def handle_message(wrapper, msg_type, args, kwargs):
+ if msg_type == NetNSWrapperMessage.SHUTDOWN:
+ wrapper.shutdown()
+
+ return "BYEBYE"
+
+ if msg_type == NetNSWrapperMessage.CREATE:
+ clazzname = args.pop(0)
+
+ return wrapper.create(clazzname, *args)
+
+ if msg_type == NetNSWrapperMessage.INVOKE:
+ uuid = args.pop(0)
+ operation = args.pop(0)
+
+ return wrapper.invoke(uuid, operation, *args, **kwargs)
+
+ if msg_type == NetNSWrapperMessage.GET:
+ uuid = args.pop(0)
+ name = args.pop(0)
+
+ return wrapper.get(uuid, name)
+
+ if msg_type == NetNSWrapperMessage.SET:
+ uuid = args.pop(0)
+ name = args.pop(0)
+ value = args.pop(0)
+
+ return wrapper.set(uuid, name, value)
+
+ if msg_type == NetNSWrapperMessage.FLUSH:
+ # Forces flushing output and error streams.
+ # NS-3 output will stay unflushed until the program exits or
+ # explicit invocation flush is done
+ sys.stdout.flush()
+ sys.stderr.flush()
+
+ wrapper.logger.debug("FLUSHED")
+
+ return "FLUSHED"
+
+def create_socket(socket_name):
+ sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ sock.bind(socket_name)
+ return sock
+
+def recv_msg(conn):
+ msg = []
+ chunk = ''
+
+ while '\n' not in chunk:
+ try:
+ chunk = conn.recv(1024)
+ except (OSError, socket.error) as e:
+ if e[0] != errno.EINTR:
+ raise
+ # Ignore eintr errors
+ continue
+
+ if chunk:
+ msg.append(chunk)
+ else:
+ # empty chunk = EOF
+ break
+
+ msg = ''.join(msg).strip()
+
+ # The message is formatted as follows:
+ # MESSAGE_TYPE|args|kwargs
+ #
+ # where MESSAGE_TYPE, args and kwargs are pickld and enoded in base64
+
+ def decode(item):
+ item = base64.b64decode(item).rstrip()
+ return pickle.loads(item)
+
+ decoded = [ decode(x) for x in msg.split("|")]
+
+ # decoded message
+ dmsg_type = decoded.pop(0)
+ dargs = list(decoded.pop(0)) # transforming touple into list
+ dkwargs = decoded.pop(0)
+
+ return (dmsg_type, dargs, dkwargs)
+
+def send_reply(conn, reply):
+ encoded = base64.b64encode(pickle.dumps(reply))
+ conn.send("%s\n" % encoded)
+
+def get_options():
+ usage = ("usage: %prog -S <socket-name> -D <enable-dump> -v ")
+
+ parser = OptionParser(usage = usage)
+
+ parser.add_option("-S", "--socket-name", dest="socket_name",
+ help = "Name for the unix socket used to interact with this process",
+ default = "tap.sock", type="str")
+
+ parser.add_option("-D", "--enable-dump", dest="enable_dump",
+ help = "Enable dumping the remote executed commands to a script "
+ "in order to later reproduce and debug the experiment",
+ action = "store_true",
+ default = False)
+
+ parser.add_option("-v", "--verbose",
+ help="Print debug output",
+ action="store_true",
+ dest="verbose", default=False)
+
+ (options, args) = parser.parse_args()
+
+ return (options.socket_name, options.verbose, options.enable_dump)
+
+def run_server(socket_name, level = logging.INFO,
+ enable_dump = False):
+
+ ###### wrapper instantiation
+ if level == logging.DEBUG:
+ from syslog import LOG_DEBUG
+ import netns
+ netns.environ.set_log_level(LOG_DEBUG)
+
+ wrapper = NetNSWrapper(loglevel=level, enable_dump = enable_dump)
+
+ wrapper.logger.info("STARTING...")
+
+ # create unix socket to receive instructions
+ sock = create_socket(socket_name)
+ sock.listen(0)
+
+ # wait for messages to arrive and process them
+ stop = False
+
+ while not stop:
+ conn, addr = sock.accept()
+ conn.settimeout(5)
+
+ try:
+ (msg_type, args, kwargs) = recv_msg(conn)
+ except socket.timeout as e:
+ # Ingore time-out
+ continue
+
+ if not msg_type:
+ # Ignore - connection lost
+ break
+
+ if msg_type == NetNSWrapperMessage.SHUTDOWN:
+ stop = True
+
+ try:
+ reply = handle_message(wrapper, msg_type, args, kwargs)
+ except:
+ import traceback
+ err = traceback.format_exc()
+ wrapper.logger.error(err)
+ raise
+
+ try:
+ send_reply(conn, reply)
+ except socket.error:
+ break
+
+ wrapper.logger.info("EXITING...")
+
+if __name__ == '__main__':
+
+ (socket_name, verbose, enable_dump) = get_options()
+
+ ## configure logging
+ FORMAT = "%(asctime)s %(name)s %(levelname)-4s %(message)s"
+ level = logging.DEBUG if verbose else logging.INFO
+
+ logging.basicConfig(format = FORMAT, level = level)
+
+ ## Run the server
+ run_server(socket_name, level, enable_dump)
+
git://git.onelab.eu / nepi.git / blobdiff