Introduce node and group level vars

Variables can now be fed to model from multiple locations. In order of
preference:

1) node (from source)
2) group
3) global

In a model vars should be accessed via 'vars' helper method though it is
not required. Helper method ignores nil values so care needs to taken
when designing model behaviour.

Support for node level vars is currently available on sql source via
'vars_map' configuration.

Following example populates node vars 'enable' and 'somevariable' from sql
columns 'var_enable' and 'var_somevariable'

   sql:
     adapter: sqlite
     file: /home/aakso/.config/oxidized/sqrouter.db
     table: nodes
     map:
       name: hostname
       model: model
       group: node_group
       username: username
       password: password
     vars_map:
       enable: var_enablepw
       somevariable: var_somevariable

1 files changed, 7 insertions, 2 deletions

diff --git a/lib/oxidized/node.rb b/lib/oxidized/node.rb
index fce4c21..0537e45 100644
--- a/lib/oxidized/node.rb
+++ b/lib/oxidized/node.rb
@@ -3,7 +3,7 @@ module Oxidized
   class MethodNotFound < OxidizedError; end
   class ModelNotFound  < OxidizedError; end
   class Node
-    attr_reader :name, :ip, :model, :input, :output, :group, :auth, :prompt
+    attr_reader :name, :ip, :model, :input, :output, :group, :auth, :prompt, :vars
     attr_accessor :last, :running, :user, :msg, :from
     alias :running? :running
     def initialize opt
@@ -15,6 +15,10 @@ module Oxidized
       @model          = resolve_model opt
       @auth           = resolve_auth opt
       @prompt         = resolve_prompt opt
+      @vars           = opt[:vars]
+
+      # model instance needs to access node instance
+      @model.node = self
     end
 
     def run
@@ -73,6 +77,7 @@ module Oxidized
         :group     => @group,
         :model     => @model.class.to_s,
         :last      => nil,
+        :vars      => @vars,
       }
       h[:full_name] = [@group, @name].join('/') if @group
       if @last
@@ -138,7 +143,7 @@ module Oxidized
       if not Oxidized.mgr.model[model]
         Oxidized.mgr.add_model model or raise ModelNotFound, "#{model} not found for node #{ip}"
       end
-      Oxidized.mgr.model[model].new
+      Oxidized.mgr.model[model].new 
     end
 
   end