X-Git-Url: https://osm.etsi.org/gitweb/?a=blobdiff_plain;f=emuvim%2Fdcemulator%2Fnode.py;h=6d615b5599938a0ac743acf9f2b16f3a9ee1f7f3;hb=326d06d0db129a0b0f981ee84fc62a9a5e41a3e0;hp=b095e190b3b9d4b5a7ca2ad683ae878bf8e189cd;hpb=9c252b6c886bc254872fd1dfe3c19fab6fe15570;p=osm%2Fvim-emu.git

diff --git a/emuvim/dcemulator/node.py b/emuvim/dcemulator/node.py
index b095e19..6d615b5 100644
--- a/emuvim/dcemulator/node.py
+++ b/emuvim/dcemulator/node.py
@@ -2,22 +2,79 @@
 Distributed Cloud Emulator (dcemulator)
 (c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
 """
+from mininet.node import Docker
 import logging
 
 
 DCDPID_BASE = 1000  # start of switch dpid's used for data center switches
 
 
+class EmulatorCompute(Docker):
+    """
+    Emulator specific compute node class.
+    Inherits from Dockernet's Docker host class.
+    Represents a single container connected to a (logical)
+    data center.
+    We can add emulator specific helper functions to it.
+    """
+
+    def __init__(
+            self, name, dimage, **kwargs):
+        logging.debug("Create EmulatorCompute instance: %s" % name)
+        self.datacenter = None  # pointer to current DC
+
+        # call original Docker.__init__
+        Docker.__init__(self, name, dimage, **kwargs)
+
+    def getNetworkStatus(self):
+        """
+        Helper method to receive information about the virtual networks
+        this compute instance is connected to.
+        """
+        # format list of tuples (name, Ip, MAC, isUp, status)
+        return [(str(i), i.IP(), i.MAC(), i.isUp(), i.status())
+                for i in self.intfList()]
+
+    def getStatus(self):
+        """
+        Helper method to receive information about this compute instance.
+        """
+        status = {}
+        status["name"] = self.name
+        status["network"] = self.getNetworkStatus()
+        status["image"] = self.dimage
+        status["cpu_quota"] = self.cpu_quota
+        status["cpu_period"] = self.cpu_period
+        status["cpu_shares"] = self.cpu_shares
+        status["cpuset"] = self.cpuset
+        status["mem_limit"] = self.mem_limit
+        status["memswap_limit"] = self.memswap_limit
+        status["state"] = self.dcli.inspect_container(self.dc)["State"]
+        status["id"] = self.dcli.inspect_container(self.dc)["Id"]
+        status["datacenter"] = (None if self.datacenter is None
+                                else self.datacenter.label)
+        return status
+
+
 class Datacenter(object):
     """
     Represents a logical data center to which compute resources
     (Docker containers) can be added at runtime.
+
+    Will also implement resource bookkeeping in later versions.
     """
 
-    def __init__(self, name):
+    DC_COUNTER = 1
+
+    def __init__(self, label):
         self.net = None  # DCNetwork to which we belong
-        self.name = name
+        # each node (DC) has a short internal name used by Mininet
+        # this is caused by Mininets naming limitations for swtiches etc.
+        self.name = "dc%d" % Datacenter.DC_COUNTER
+        Datacenter.DC_COUNTER += 1
+        self.label = label  # use this for user defined names
         self.switch = None  # first prototype assumes one "bigswitch" per DC
+        self.containers = {}  # keep track of running containers
 
     def _get_next_dc_dpid(self):
         global DCDPID_BASE
@@ -32,15 +89,54 @@ class Datacenter(object):
         TODO: This will be changed in the future to support multiple networks
         per data center
         """
-        self.switch = self.net.mnet.addSwitch(
+        self.switch = self.net.addSwitch(
             "%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
         logging.debug("created data center switch: %s" % str(self.switch))
 
     def start(self):
         pass
 
-    def addCompute(self):
-        pass
+    def startCompute(self, name, image=None, network=None):
+        """
+        Create a new container as compute resource and connect it to this
+        data center.
 
-    def removeCompute(self):
-        pass
+        TODO: This interface will change to support multiple networks to which
+        a single container can be connected.
+        """
+        assert name is not None
+        # no duplications
+        if name in [c.name for c in self.net.getAllContainers()]:
+            raise Exception("Container with name %s already exists." % name)
+        # set default parameter
+        if image is None:
+            image = "ubuntu"
+        if network is None:
+            network = {}  # {"ip": "10.0.0.254/8"}
+        # create the container and connect it to the given network
+        d = self.net.addDocker("%s" % (name), dimage=image)
+        self.net.addLink(d, self.switch, params1=network)
+        # do bookkeeping
+        self.containers[name] = d
+        d.datacenter = self
+        return d  # we might use UUIDs for naming later on
+
+    def stopCompute(self, name):
+        """
+        Stop and remove a container from this data center.
+        """
+        assert name is not None
+        if name not in self.containers:
+            raise Exception("Container with name %s not found." % name)
+        self.net.removeLink(
+            link=None, node1=self.containers[name], node2=self.switch)
+        self.net.removeDocker("%s" % (name))
+        del self.containers[name]
+        return True
+
+    def listCompute(self):
+        """
+        Return a list of all running containers assigned to this
+        data center.
+        """
+        return list(self.containers.itervalues())