diff options
Diffstat (limited to 'provider_base/lib/macros/nodes.rb')
| -rw-r--r-- | provider_base/lib/macros/nodes.rb | 88 |
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 @@ -0,0 +1,88 @@ +# 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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