Synchronizing access to ns-3 linux client

[nepi.git] / src / nepi / resources / linux / ns3 / ns3client.py

diff --git a/src/nepi/resources/linux/ns3/ns3client.py b/src/nepi/resources/linux/ns3/ns3client.py
index 972e800..1dd0c5a 100644 (file)
--- a/src/nepi/resources/linux/ns3/ns3client.py
+++ b/src/nepi/resources/linux/ns3/ns3client.py
@@ -20,74 +20,99 @@
 import base64
 import cPickle
 import errno
+import os
 import socket
+import time
+import weakref
+import threading
+
 from optparse import OptionParser, SUPPRESS_HELP
 
 from nepi.resources.ns3.ns3client import NS3Client
 from nepi.resources.ns3.ns3server import NS3WrapperMessage
 
 class LinuxNS3Client(NS3Client):
-    def __init__(self, socket_name):
+    def __init__(self, simulation):
         super(LinuxNS3Client, self).__init__()
-        self._socket_name = socket_name
+        self._simulation = weakref.ref(simulation)
+        self._socket_lock = threading.Lock()
 
     @property
-    def socket_name(self):
-        return self._socket_name
-
-    def send_msg(self, msg, *args):
-        args = list(args)
-
-        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-        sock.connect(self.socket_name)
-
-        args.insert(0, msg)
-        def encode(arg):
-            arg = cPickle.dumps(arg)
-            return base64.b64encode(arg) 
-
-        encoded = "|".join(map(encode, args))
-        sock.send("%s\n" % encoded)
-        
-        reply = sock.recv(1024)
-        return cPickle.loads(base64.b64decode(reply))
-
-    def create(self, clazzname, *args):
-        args = list(args)
-        args.insert(0, clazzname)
-        
-        return self.send_msg(NS3WrapperMessage.CREATE, *args)
-
-    def invoke(self, uuid, operation, *args):
-        args = list(args)
-        args.insert(0, operation)
-        args.insert(0, uuid)
-
-        return self.send_msg(NS3WrapperMessage.INVOKE, *args)
-
-    def set(self, uuid, name, value):
-        args = [uuid, name, value]
-
-        return self.send_msg(NS3WrapperMessage.SET, *args)
-
-    def get(self, uuid, name):
-        args = [uuid, name]
-
-        return self.send_msg(NS3WrapperMessage.GET, *args)
-
-    def trace(self, *args):
-        return self.send_msg(NS3WrapperMessage.TRACE, *args)
-
-    def start(self):
-        return self.send_msg(NS3WrapperMessage.START, [])
-
-    def stop(self, time = None):
-        args = None
-        if time:
-            args = [time]
-
-        return self.send_msg(NS3WrapperMessage.STOP, *args)
-
-    def shutdown(self):
-        return self.send_msg(NS3WrapperMessage.SHUTDOWN, [])
+    def simulation(self):
+        return self._simulation()
+
+    def send_msg(self, msg_type, *args, **kwargs):
+        msg = [msg_type, args, kwargs]
+
+        def encode(item):
+            item = cPickle.dumps(item)
+            return base64.b64encode(item)
+
+        encoded = "|".join(map(encode, msg))
+
+        with self._socket_lock:
+            if self.simulation.node.get("hostname") in ['localhost', '127.0.0.1']:
+                sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+                sock.connect(self.simulation.remote_socket)
+                sock.send("%s\n" % encoded)
+                reply = sock.recv(1024)
+                sock.close()
+            else:
+                command = ( "python -c 'import socket;"
+                    "sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM);"
+                    "sock.connect(\"%(socket_addr)s\");"
+                    "msg = \"%(encoded_message)s\\n\";"
+                    "sock.send(msg);"
+                    "reply = sock.recv(1024);"
+                    "sock.close();"
+                    "print reply'") % {
+                        "encoded_message": encoded,
+                        "socket_addr": self.simulation.remote_socket,
+                        }
+
+                (reply, err), proc = self.simulation.node.execute(command, 
+                        with_lock = True) 
+
+                if (err and proc.poll()) or reply.strip() == "":
+                    msg = (" Couldn't connect to remote socket %s - REPLY: %s "
+                          "- ERROR: %s ") % (
+                            self.simulation.remote_socket, reply, err)
+                    self.simulation.error(msg, reply, err)
+                    raise RuntimeError(msg)
+                       
+        reply = cPickle.loads(base64.b64decode(reply))
+
+        return reply
+
+    def create(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.CREATE, *args, **kwargs)
+
+    def factory(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.FACTORY, *args, **kwargs)
+
+    def invoke(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.INVOKE, *args, **kwargs)
+
+    def set(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.SET, *args, **kwargs)
+
+    def get(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.GET, *args, **kwargs)
+
+    def flush(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.FLUSH, *args, **kwargs)
+
+    def start(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.START, *args, **kwargs)
+
+    def stop(self, *args, **kwargs):
+        return self.send_msg(NS3WrapperMessage.STOP, *args, **kwargs)
+
+    def shutdown(self, *args, **kwargs):
+        try:
+            return self.send_msg(NS3WrapperMessage.SHUTDOWN, *args, **kwargs)
+        except:
+            pass
+
+        return None