Module: Y2Firewall::Firewalld::Relations

Included in:
Service, Zone
Defined in:
library/network/src/lib/y2firewall/firewalld/relations.rb

Overview

Extends the base class with metaprogramming methods which defines some attributes common logic.

Instance Method Summary collapse

Instance Method Details

#enable_modifications_cache ⇒ Object 



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# File 'library/network/src/lib/y2firewall/firewalld/relations.rb', line 6

def enable_modifications_cache
  attr_writer :modified

  # Return an array with all the modified attributes/relations
  define_method "modified" do
    @modified ||= []
  end

  # Mark the given attribute as modified.
  define_method "modified!" do |item|
    @modified << item unless modified.include?(item)
  end

  # Return whether the object has been modified or not. If an argument is
  # given then it returns whether the given attribute or relation has
  # been modififed.
  define_method "modified?" do |*item|
    return !modified.empty? if item.empty?

    modified.include?(item.first)
  end

  # Reset all the modifications
  define_method "untouched!" do
    @modified = []
  end
end

#has_many(*relations, scope: nil, cache: false) ⇒ Object

Defines a set of methods to operate over array based firewalld attributes like services, interfaces, protocols, ports… Bang! methods applies the object modifications into the firewalld zone using the Firewalld API.

A modifications cache can be enable with the cache param. In that case it is important to initialize objects with the instance variable

Examples:


class Zone
  extend Relations

  has_many :services, cache: true

  def initialize
    @modified = []
  end
end

zone = Zone.new

# Return all the declared relations
zone.relations #=> [:services]
# Read all the relations initializing the object
zone.read_relations
# Adds the "ssh" service into the zone object if not present
zone.add_service("ssh")
# Removes the "ssh" service from the zone object
zone.remove_service("ssh")
# List of current firewalld configured services
zone.current_services
# Adds the service "ssh" definitely into the firewalld zone
zone.add_service!("ssh")
# Removes the service "ssh" definitely from firewalld zone
zone.remove_service!("ssh")
Loop through all the services were added to the zone object since
read adding them definitely to firewalld
zone.add_services!
Loop through all the services were removed from the zone object since
read adding them to firewalld
zone.remove_services!
# Returns the list of services added after read
zone.services_to_add
# Returns the list of services removed after read
zone.services_to_remove
# Apply the changes (remove_services! && add_services!)
zone.apply_services_changes!
# Apply all the relations changes
zone.apply_relations_changes!


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# File 'library/network/src/lib/y2firewall/firewalld/relations.rb', line 87

def has_many(*relations, scope: nil, cache: false) # rubocop:disable Style/PredicateName
  scope = "#{scope}_" if scope
  enable_modifications_cache if cache

  define_method "relations" do
    relations
  end

  define_method "apply_relations_changes!" do
    relations.each { |r| public_send("apply_#{r}_changes!") }
    true
  end

  define_method "read_relations" do
    relations.each { |r| instance_variable_set("@#{r}", public_send("current_#{r}")) }
    true
  end

  relations.each do |relation|
    relation_singularized = relation.to_s.sub(/s$/, "")
    attr_reader relation

    define_method "#{relation}=" do |item|
      instance_variable_set("@#{relation}", item)

      modified!(relation) if cache
    end

    define_method "add_#{relation_singularized}" do |item|
      return public_send(relation) if public_send(relation).include?(item)
      modified!(relation) if cache
      public_send(relation) << item
    end

    define_method "remove_#{relation_singularized}" do |item|
      if public_send(relation).delete(item)
        modified!(relation) if cache
        return public_send(relation)
      end

      public_send(relation)
    end

    define_method "current_#{relation}" do
      if scope
        api.public_send("#{scope}#{relation}", name)
      else
        api.public_send("list_#{relation}", name)
      end
    end

    define_method "add_#{relation_singularized}!" do |item|
      api.public_send("add_#{scope}#{relation_singularized}", name, item)
    end

    define_method "remove_#{relation_singularized}!" do |item|
      api.public_send("remove_#{scope}#{relation_singularized}", name, item)
    end

    define_method "add_#{relation}!" do
      public_send("#{relation}_to_add").map { |i| public_send("add_#{relation_singularized}!", i) }
    end

    define_method "remove_#{relation}!" do
      public_send("#{relation}_to_remove").map { |i| public_send("remove_#{relation_singularized}!", i) }
    end

    define_method "#{relation}_to_add" do
      public_send(relation) - public_send("current_#{relation}")
    end

    define_method "#{relation}_to_remove" do
      public_send("current_#{relation}") - public_send(relation)
    end

    define_method "apply_#{relation}_changes!" do
      return if cache && !modified?(relation)
      public_send("remove_#{relation}!")
      public_send("add_#{relation}!")

      modified.delete(relation)
    end
  end
end