From e36189f8ba98d8a1b254a8dd300f59d5c12a9430 Mon Sep 17 00:00:00 2001
From: Marco Capitani <m.capitani@nextworks.it>
Date: Tue, 13 Jun 2017 12:44:04 +0200
Subject: IRATI: added per-node policy support, and revamped policy data model.

additional:
+ fixed small bug rlated to vhost checking in qemu.
+ example scripts now correctly use policies.
---
 rumba/model.py | 78 ++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 59 insertions(+), 19 deletions(-)

(limited to 'rumba/model.py')

diff --git a/rumba/model.py b/rumba/model.py
index e0f1dcc..affdcbf 100644
--- a/rumba/model.py
+++ b/rumba/model.py
@@ -20,9 +20,6 @@
 # MA  02110-1301  USA
 
 import abc
-import random
-
-import time
 
 import rumba.log as log
 
@@ -128,11 +125,11 @@ class ShimEthDIF(DIF):
 #                       dict( name: str --> value: str )))
 #
 class NormalDIF(DIF):
-    def __init__(self, name, members=None, policies=None):
+    def __init__(self, name, members=None, policy=None):
         DIF.__init__(self, name, members)
-        if policies is None:
-            self.policy = Policy(self)
-        self.policy = Policy(self, policies=policies)
+        if policy is None:
+            policy = Policy(self)
+        self.policy = policy
 
     def add_policy(self, comp, pol, **params):
         self.policy.add_policy(comp, pol, **params)
@@ -162,7 +159,7 @@ class SSHConfig:
 #
 # @difs: DIFs the node will have an IPCP in
 # @dif_registrations: Which DIF is registered in which DIF
-# @policies: dict of dif -> policy dict to apply for that dif in this node
+# @policies: dict of dif -> policy to apply for that dif in this node
 #
 #
 class Node:
@@ -179,13 +176,12 @@ class Node:
         self.dif_registrations = dif_registrations
         self.ssh_config = SSHConfig(name)
         self.ipcps = []
+        self.policies = dict()
         if policies is None:
             policies = dict()
-            self.policies = dict()
         for dif in self.difs:
-            if hasattr(dif, 'policy'):
-                self.policies[dif] = \
-                    Policy(dif, self, policies.get(dif.name, {}))
+            if hasattr(dif, 'policy'):  # check if the dif supports policies
+                self.policies[dif] = policies.get(dif, Policy(dif, self))
         self.client = client
 
         self._validate()
@@ -208,7 +204,7 @@ class Node:
             for lower in self.dif_registrations[upper]:
                 self._undeclared_dif(lower)
 
-    def __repr__(self):  # TODO add policies in repr
+    def __repr__(self):
         s = "Node " + self.name + ":\n"
 
         s += "  DIFs: [ "
@@ -226,6 +222,8 @@ class Node:
         s += ", ".join(rl)
         s += " ]\n"
 
+        s += "  Policies: [ "
+
         return s
 
     def __hash__(self):
@@ -268,6 +266,9 @@ class Node:
     def del_policy(self, dif, component_name=None, policy_name=None):
         self.policies[dif].del_policy(component_name, policy_name)
 
+    def get_policy(self, dif):
+        return self.policies[dif]
+
 
 # Base class representing an IPC Process to be created in the experiment
 #
@@ -317,6 +318,10 @@ class ShimUDPIPCP(IPCP):
 
 
 # Class representing DIF and Node policies
+#
+# @dif: the dif this policy is applied to.
+# @node: the node
+#
 class Policy(object):
     def __init__(self, dif, node=None, policies=None):
         self.dif = dif  # type: NormalDIF
@@ -329,11 +334,11 @@ class Policy(object):
     def add_policy(self, component_name, policy_name, **parameters):
         self._dict.setdefault(component_name, dict())[policy_name] = parameters
 
+    #
+    # Fetches effective policy info
+    #
     def get_policies(self, component_name=None, policy_name=None):
-        if self.node is not None:
-            policy = self._superimpose(self.dif.policy)
-        else:
-            policy = self
+        policy = self._superimpose()
         if component_name is None:
             return policy._dict
         elif policy_name is None:
@@ -349,10 +354,45 @@ class Policy(object):
         else:
             del self._dict[component_name][policy_name]
 
-    def _superimpose(self, other):
+    #
+    # Merges this policy into that of its dif, obtaining
+    # the effective policy acting on self.node.
+    #
+    def _superimpose(self):
+        if self.node is None:
+            return self
+        other = self.dif.policy
         base = dict(other._dict)
         base.update(self._dict)
-        return Policy(base)
+        return Policy(self.dif, self.node, base)
+
+    def __eq__(self, other):
+        if not isinstance(other, Policy):
+            return False
+        else:
+            return other.dif == self.dif \
+                   and other.node == self.node \
+                   and other._dict == self._dict
+
+    def __str__(self):
+        node_str = (" Node: " + self.node) if self.node is not None else ""
+        return "Policy[Dif: %(dif)s,%(node_str)s Dict: %(dict)s]" \
+               % {"dif": self.dif, "node_str": node_str, "dict": self._dict}
+
+    def __repr__(self):
+        node_str = (" Node: " + self.node) if self.node is not None else ""
+        s = "Policy[ Dif: %(dif)s,%(node_str)s" \
+            % {"dif": self.dif, "node_str": node_str}
+        comps = []
+        for component in self._dict:
+            for policy in self._dict[component]:
+                comps.append("\n  Component %s has policy %s with params %s"
+                             % (component,
+                                policy,
+                                self._dict[component][policy]))
+        s += ",".join(comps)
+        s += "\n]\n"
+        return s
 
 
 # Base class for ARCFIRE experiments
-- 
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