1 files changed, 25 insertions, 7 deletions
diff --git a/lib/oxidized/nodes.rb b/lib/oxidized/nodes.rb
index affeea8..981e082 100644
--- a/lib/oxidized/nodes.rb
+++ b/lib/oxidized/nodes.rb
@@ -7,36 +7,43 @@ module Oxidized
     alias :put :unshift
     def initialize *args
       super
+      @mutex= Mutex.new  # we compete for the nodes with webapi thread
       load if args.empty?
     end
     def load
+      lock
       new = []
       @source = CFG.source[:default]
       Oxidized.mgr.source = @source
       Oxidized.mgr.source[@source].new.load.each do |node|
         new.push Node.new node
       end
-      replace new
+      unlock(replace new)
     end
     def list
-      map { |e| e.name }
+      lock
+      unlock(map { |e| e.serialize })
     end
     def show node
+      lock
       i = find_node_index node
-      self[i].serialize
+      unlock(self[i].serialize)
     end
     def fetch node, group
+      lock
       i = find_node_index node
       output = self[i].output.new
+      unlock
       raise Oxidized::NotSupported unless output.respond_to? :fetch
       output.fetch node, group
     end
     def del node
-      delete_at find_node_index
+      lock
+      unlock(delete_at find_node_index(node))
     end
     # @param node [String] name of the node moved into the head of array
     def next node, opt={}
-      require 'pp'
+      lock
       n = del node
       if n
         n.user = opt['user']
@@ -44,21 +51,32 @@ module Oxidized
         n.from = opt['from']
         put n
       end
+      unlock
     end
     alias :top :next
     # @return [String] node from the head of the array
     def get
-      (self << shift).last
+      lock
+      unlock((self << shift).last)
     end
 
     private
 
+    def lock
+      @mutex.lock unless @mutex.owned?
+    end
+
+    def unlock arg=nil
+      @mutex.unlock if @mutex.owned?
+      arg
+    end
+
     def find_index node
       index { |e| e.name == node }
     end
 
     def find_node_index node
-      find_index node or raise Oxidized::NodeNotFound
+      find_index node or raise Oxidized::NodeNotFound, "unable to find '#{node}'"
     end
   end
 end