docs: pass updating python examples to be the same as grpc examples and remove extra cruft to focus on simpler example code alone

daemon/examples/python/switch.py

@@ -1,54 +1,41 @@
-"""
-This is a standalone script to run a small switch based scenario and will not
-interact with the GUI.
-"""
-
-import logging
-
+# required imports
 from core.emulator.coreemu import CoreEmu
-from core.emulator.data import IpPrefixes
+from core.emulator.data import IpPrefixes, NodeOptions
 from core.emulator.enumerations import EventTypes
 from core.nodes.base import CoreNode
 from core.nodes.network import SwitchNode
 
-NODES = 2
+# ip nerator for example
+ip_prefixes = IpPrefixes(ip4_prefix="10.0.0.0/24")
 
+# create emulator instance for creating sessions and utility methods
+coreemu = CoreEmu()
+session = coreemu.create_session()
 
-def main():
-    # ip generator for example
-    prefixes = IpPrefixes(ip4_prefix="10.83.0.0/16")
+# must be in configuration state for nodes to start, when using "node_add" below
+session.set_state(EventTypes.CONFIGURATION_STATE)
 
-    # create emulator instance for creating sessions and utility methods
-    coreemu = CoreEmu()
-    session = coreemu.create_session()
+# create switch
+options = NodeOptions(x=200, y=200)
+switch = session.add_node(SwitchNode, options=options)
 
-    # must be in configuration state for nodes to start, when using "node_add" below
-    session.set_state(EventTypes.CONFIGURATION_STATE)
+# create nodes
+options = NodeOptions(x=100, y=100)
+n1 = session.add_node(CoreNode, options=options)
+options = NodeOptions(x=300, y=100)
+n2 = session.add_node(CoreNode, options=options)
 
-    # create switch network node
-    switch = session.add_node(SwitchNode, _id=100)
+# link nodes to switch
+iface1 = ip_prefixes.create_iface(n1)
+session.add_link(n1.id, switch.id, iface1)
+iface1 = ip_prefixes.create_iface(n2)
+session.add_link(n2.id, switch.id, iface1)
 
-    # create nodes
-    for _ in range(NODES):
-        node = session.add_node(CoreNode)
-        interface = prefixes.create_iface(node)
-        session.add_link(node.id, switch.id, iface1_data=interface)
+# start session
+session.instantiate()
 
-    # instantiate session
-    session.instantiate()
+# do whatever you like here
+input("press enter to shutdown")
 
-    # get nodes to run example
-    first_node = session.get_node(1, CoreNode)
-    last_node = session.get_node(NODES, CoreNode)
-    address = prefixes.ip4_address(first_node.id)
-    logging.info("node %s pinging %s", last_node.name, address)
-    output = last_node.cmd(f"ping -c 3 {address}")
-    logging.info(output)
-
-    # shutdown session
-    coreemu.shutdown()
-
-
-if __name__ == "__main__":
-    logging.basicConfig(level=logging.INFO)
-    main()
+# stop session
+session.shutdown()