accept global defaults as ctor args in Base Layer

Author: amdfxlucas

examples/basic/A00_simple_as/simple_as.py

@@ -29,7 +29,9 @@ def run(dumpfile = None):
 
     # Initialize the emulator and layers
     emu     = Emulator()
-    base    = Base()
+    # set global defaults..
+    base    = Base(bandwidth=OptionRegistry().net_bandwidth(10000000),# 10 Mbit/s on all links
+                    mtu=OptionRegistry().net_mtu(9000)) # use JumboFrames 
     routing = Routing()
     ebgp    = Ebgp()
     web     = WebService()
@@ -43,7 +45,7 @@ def run(dumpfile = None):
 
     # Create an autonomous system 
     as150 = base.createAutonomousSystem(150)
-    as150.setOption(OptionRegistry().net_mtu(9000))
+    as150.setOption(OptionRegistry().net_mtu(1500))
 
     # Create a network 
     as150.createNetwork('net0')

seedemu/layers/Base.py

@@ -60,14 +60,24 @@ def getNetOptions(self):
         return [OptionRegistry().getOption(o) for o in opt_keys]
 
 
-    def __init__(self):
+    def __init__(self, **kwargs):
         """!
         @brief Base layer constructor.
         """
         super().__init__()
         self.__ases = {}
         self.__ixes = {}
         self.__name_servers = []
+        from seedemu.core import OptionRegistry
+        for k,v in kwargs.items():
+        # Replace the 'defaults' class methods dynamically
+      
+            opt_cls = type(v)
+            # Capture 'new_value' as default argument (forces a snapshot of the current value)
+            opt_cls.default = classmethod(lambda cls, new_value=v.value: new_value)
+            opt_cls.defaultMode = classmethod(lambda cls, newmode=v.mode: newmode)
+            prefix = getattr(opt_cls, '__prefix') if hasattr(opt_cls, '__prefix') else None
+            OptionRegistry().register(opt_cls, prefix)
 
     def getName(self) -> str:
         return "Base"