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|
#
# Many leap_cli commands accept a list of filters to select a subset of nodes for the command to
# be applied to. This class is a helper for manager to run these filters.
#
# Classes other than Manager should not use this class.
#
# Filter rules:
#
# * A filter consists of a list of tokens
# * A token may be a service name, tag name, environment name, or node name.
# * Each token may be optionally prefixed with a plus sign.
# * Multiple tokens with a plus are treated as an OR condition,
# but treated as an AND condition with the plus sign.
#
# For example
#
# * openvpn +development => all nodes with service 'openvpn' AND environment 'development'
# * openvpn seattle => all nodes with service 'openvpn' OR tag 'seattle'.
#
# There can only be one environment specified. Typically, there are also tags
# for each environment name. These name are treated as environments, not tags.
#
module LeapCli
module Config
class Filter
#
# filter -- array of strings, each one a filter
# options -- hash, possible keys include
# :nopin -- disregard environment pinning
# :local -- if false, disallow local nodes
#
# A nil value in the filters array indicates
# the default environment. This is in order to support
# calls like `manager.filter(environments)`
#
def initialize(filters, options, manager)
@filters = filters.nil? ? [] : filters.dup
@environments = []
@options = options
@manager = manager
# split filters by pulling out items that happen
# to be environment names.
if LeapCli.leapfile.environment.nil? || @options[:nopin]
@environments = []
else
@environments = [LeapCli.leapfile.environment]
end
@filters.select! do |filter|
if filter.nil?
@environments << nil unless @environments.include?(nil)
false
else
filter_text = filter.sub(/^\+/,'')
if is_environment?(filter_text)
if filter_text == LeapCli.leapfile.environment
# silently ignore already pinned environments
elsif (filter =~ /^\+/ || @filters.first == filter) && !@environments.empty?
LeapCli::Util.bail! do
LeapCli::Util.log "Environments are exclusive: no node is in two environments." do
LeapCli::Util.log "Tried to filter on '#{@environments.join('\' AND \'')}' AND '#{filter_text}'"
end
end
else
@environments << filter_text
end
false
else
true
end
end
end
# don't let the first filter have a + prefix
if @filters[0] =~ /^\+/
@filters[0] = @filters[0][1..-1]
end
end
# actually run the filter, returns a filtered list of nodes
def nodes()
if @filters.empty?
return nodes_for_empty_filter
else
return nodes_for_filter
end
end
private
def nodes_for_empty_filter
node_list = @manager.nodes
if @environments.any?
node_list = node_list[ @environments.collect{|e|[:environment, env_to_filter(e)]} ]
end
if @options[:local] === false
node_list = node_list[:environment => '!local']
end
node_list
end
def nodes_for_filter
node_list = Config::ObjectList.new
@filters.each do |filter|
if filter =~ /^\+/
keep_list = nodes_for_name(filter[1..-1])
node_list.delete_if do |name, node|
if keep_list[name]
false
else
true
end
end
else
node_list.merge!(nodes_for_name(filter))
end
end
node_list
end
private
#
# returns a set of nodes corresponding to a single name,
# where name could be a node name, service name, or tag name.
#
# For services and tags, we only include nodes for the
# environments that are active
#
def nodes_for_name(name)
if node = @manager.nodes[name]
return Config::ObjectList.new(node)
elsif @environments.empty?
if @manager.services[name]
return @manager.env('_all_').services[name].node_list
elsif @manager.tags[name]
return @manager.env('_all_').tags[name].node_list
else
LeapCli::Util.log :warning, "filter '#{name}' does not match any node names, tags, services, or environments."
return Config::ObjectList.new
end
else
node_list = Config::ObjectList.new
if @manager.services[name]
@environments.each do |env|
node_list.merge!(@manager.env(env).services[name].node_list)
end
elsif @manager.tags[name]
@environments.each do |env|
node_list.merge!(@manager.env(env).tags[name].node_list)
end
else
LeapCli::Util.log :warning, "filter '#{name}' does not match any node names, tags, services, or environments."
end
return node_list
end
end
#
# when pinning, we use the name 'default' to specify nodes
# without an environment set, but when filtering, we need to filter
# on :environment => nil.
#
def env_to_filter(environment)
environment == 'default' ? nil : environment
end
def is_environment?(text)
text == 'default' || @manager.environment_names.include?(text)
end
end
end
end
|
