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-rw-r--r--lib/puppet/parser/functions/local_fence_devices.rb34
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/local_fence_devices.rb b/lib/puppet/parser/functions/local_fence_devices.rb
new file mode 100644
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--- /dev/null
+++ b/lib/puppet/parser/functions/local_fence_devices.rb
@@ -0,0 +1,34 @@
+module Puppet::Parser::Functions
+ newfunction(:local_fence_devices, :arity =>2, :type => :rvalue,
+ :doc => ("Given an array of fence device configs, limit them" +
+ "to fence devices whose MAC address is present on" +
+ "some of the local NICs, and prepare a hash which can be" +
+ "passed to create_resources function")) do |args|
+ agent = args[0]
+ devices = args[1]
+ unless agent.is_a?(String) && agent.length > 0
+ raise Puppet::ParseError, "local_fence_devices: Argument 'agent' must be a non-empty string. The value given was: #{agent_type}"
+ end
+ unless devices.is_a?(Array)
+ raise Puppet::ParseError, "local_fence_devices: Argument 'devices' must be an array. The value given was: #{devices}"
+ end
+
+ # filter by agent type
+ agent_type_devices = devices.select { |device| device['agent'] == agent }
+
+ # filter by local mac address
+ local_devices = agent_type_devices.select do |device|
+ function_has_interface_with(['macaddress', device['host_mac']])
+ end
+
+ # construct a hash for create_resources
+ return local_devices.each_with_object({}) do |device, hash|
+ # disallow collisions
+ if hash[device['host_mac']]
+ raise Puppet::ParseError, "local_fence_devices: Only single fence device per agent per host is allowed. Collision on #{device['host_mac']} for #{agent}"
+ end
+
+ hash[device['host_mac']] = device['params'] || {}
+ end
+ end
+end