Merge branch 'develop'

Conflicts:
	platform.rb

Change-Id: Ic2e08e594d29a585691341c8667ac0b64933a505

1 files changed, 88 insertions, 0 deletions

diff --git a/provider_base/lib/macros/nodes.rb b/provider_base/lib/macros/nodes.rb
new file mode 100644
index 00000000..0c6668a0
--- /dev/null
+++ b/provider_base/lib/macros/nodes.rb
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+# encoding: utf-8
+
+##
+## node related macros
+##
+
+module LeapCli
+  module Macro
+
+    #
+    # the list of all the nodes
+    #
+    def nodes
+      global.nodes
+    end
+
+    #
+    # grab an environment appropriate provider
+    #
+    def provider
+      global.env(@node.environment).provider
+    end
+
+    #
+    # returns a list of nodes that match the same environment
+    #
+    # if @node.environment is not set, we return other nodes
+    # where environment is not set.
+    #
+    def nodes_like_me
+      nodes[:environment => @node.environment]
+    end
+
+    #
+    # returns a list of nodes that match the location name
+    # and environment of @node.
+    #
+    def nodes_near_me
+      if @node['location'] && @node['location']['name']
+        nodes_like_me['location.name' => @node.location.name]
+      else
+        nodes_like_me['location' => nil]
+      end
+    end
+
+    #
+    #
+    # picks a node out from the node list in such a way that:
+    #
+    # (1) which nodes picked which nodes is saved in secrets.json
+    # (2) when other nodes call this macro with the same node list, they are guaranteed to get a different node
+    # (3) if all the nodes in the pick_node list have been picked, remaining nodes are distributed randomly.
+    #
+    # if the node_list is empty, an exception is raised.
+    # if node_list size is 1, then that node is returned and nothing is
+    # memorized via the secrets.json file.
+    #
+    # `label` is needed to distinguish between pools of nodes for different purposes.
+    #
+    # TODO: more evenly balance after all the nodes have been picked.
+    #
+    def pick_node(label, node_list)
+      if node_list.any?
+        if node_list.size == 1
+          return node_list.values.first
+        else
+          secrets_key = "pick_node(:#{label},#{node_list.keys.sort.join(',')})"
+          secrets_value = @manager.secrets.retrieve(secrets_key, @node.environment) || {}
+          secrets_value[@node.name] ||= begin
+            node_to_pick = nil
+            node_list.each_node do |node|
+              next if secrets_value.values.include?(node.name)
+              node_to_pick = node.name
+            end
+            node_to_pick ||= secrets_value.values.shuffle.first # all picked already, so pick a random one.
+            node_to_pick
+          end
+          picked_node_name = secrets_value[@node.name]
+          @manager.secrets.set(secrets_key, secrets_value, @node.environment)
+          return node_list[picked_node_name]
+        end
+      else
+        raise ArgumentError.new('pick_node(node_list): node_list cannot be empty')
+      end
+    end
+
+  end
+end
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