add rest api

diff --git a/src/emuvim/examples/simple_topology_restapi.py b/src/emuvim/examples/simple_topology_restapi.py
new file mode 100644 (file)
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+++ b/src/emuvim/examples/simple_topology_restapi.py
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+"""
+This is an example topology for the distributed cloud emulator (dcemulator).
+(c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
+
+
+This is an example that shows how a user of the emulation tool can
+define network topologies with multiple emulated cloud data centers.
+
+The definition is done with a Python API which looks very similar to the
+Mininet API (in fact it is a wrapper for it).
+
+We only specify the topology *between* data centers not within a single
+data center (data center internal setups or placements are not of interest,
+we want to experiment with VNF chains deployed across multiple PoPs).
+
+The original Mininet API has to be completely hidden and not be used by this
+script.
+"""
+import logging
+from mininet.log import setLogLevel
+from emuvim.dcemulator.net import DCNetwork
+from emuvim.api.rest.compute import RestApiEndpoint
+#from emuvim.api.zerorpc.compute import ZeroRpcApiEndpoint
+from emuvim.api.zerorpc.network import ZeroRpcApiEndpointDCNetwork
+
+logging.basicConfig(level=logging.INFO)
+
+
+def create_topology1():
+    """
+    1. Create a data center network object (DCNetwork)
+    """
+    net = DCNetwork()
+
+    """
+    1b. add a monitoring agent to the DCNetwork
+    """
+    mon_api = ZeroRpcApiEndpointDCNetwork("0.0.0.0", 5151)
+    mon_api.connectDCNetwork(net)
+    mon_api.start()
+    """
+    2. Add (logical) data centers to the topology
+       (each data center is one "bigswitch" in our simplified
+        first prototype)
+    """
+    dc1 = net.addDatacenter("datacenter1")
+    dc2 = net.addDatacenter("datacenter2")
+    dc3 = net.addDatacenter("long_data_center_name3")
+    dc4 = net.addDatacenter(
+        "datacenter4",
+        metadata={"mydata": "we can also add arbitrary metadata to each DC"})
+
+    """
+    3. You can add additional SDN switches for data center
+       interconnections to the network.
+    """
+    s1 = net.addSwitch("s1")
+
+    """
+    4. Add links between your data centers and additional switches
+       to define you topology.
+       These links can use Mininet's features to limit bw, add delay or jitter.
+    """
+    net.addLink(dc1, dc2)
+    net.addLink("datacenter1", s1)
+    net.addLink(s1, dc3)
+    net.addLink(s1, "datacenter4")
+
+    """
+    5. We want to access and control our data centers from the outside,
+       e.g., we want to connect an orchestrator to start/stop compute
+       resources aka. VNFs (represented by Docker containers in the emulated)
+
+       So we need to instantiate API endpoints (e.g. a zerorpc or REST
+       interface). Depending on the endpoint implementations, we can connect
+       one or more data centers to it, which can then be controlled through
+       this API, e.g., start/stop/list compute instances.
+    """
+    # create a new instance of a endpoint implementation
+    api1 = RestApiEndpoint("127.0.0.1", 5000)
+    # connect data centers to this endpoint
+    api1.connectDatacenter(dc1)
+    api1.connectDatacenter(dc2)
+    api1.connectDatacenter(dc3)
+    api1.connectDatacenter(dc4)
+    # run API endpoint server (in another thread, don't block)
+    api1.start()
+
+    """
+    6. Finally we are done and can start our network (the emulator).
+       We can also enter the Mininet CLI to interactively interact
+       with our compute resources (just like in default Mininet).
+       But we can also implement fully automated experiments that
+       can be executed again and again.
+    """
+    net.start()
+    net.CLI()
+    # when the user types exit in the CLI, we stop the emulator
+    net.stop()
+
+
+def main():
+    setLogLevel('info')  # set Mininet loglevel
+    create_topology1()
+
+
+if __name__ == '__main__':
+    main()