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Contents
module Beaker
module Shared
#Methods for selecting host or hosts that match roles.
module HostRoleParser
#Find hosts from a given array of hosts that all have the desired role.
#@param [Array<Host>] hosts The hosts to examine
#@param [String] desired_role The hosts returned will have this role in their roles list
#@return [Array<Host>] The hosts that have the desired role in their roles list
def hosts_with_role(hosts, desired_role = nil)
hosts.select do |host|
desired_role.nil? or host['roles'].include?(desired_role.to_s)
end
end
#Find a single host with the role provided. Raise an error if more than one host is found to have the
#provided role.
#@param [Array<Host>] hosts The hosts to examine
#@param [String] role The host returned will have this role in its role list
#@return [Host] The single host with the desired role in its roles list
#@raise [ArgumentError] Raised if more than one host has the given role defined, or if no host has the
# role defined.
def only_host_with_role(hosts, role)
a_host = hosts_with_role(hosts, role)
case
when a_host.length == 0
raise ArgumentError, "There should be one host with #{role} defined!"
when a_host.length > 1
host_string = ( a_host.map { |host| host.name } ).join( ', ')
raise ArgumentError, "There should be only one host with #{role} defined, but I found #{a_host.length} (#{host_string})"
end
a_host.first
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems