Add out_forward setting basis (wip)

app/assets/javascripts/nested_setting.js

@@ -0,0 +1,7 @@
+(function(){
+  "use strict";
+
+  $(function(){
+  });
+})();
+

app/assets/stylesheets/common.css.scss

@@ -123,3 +123,9 @@ label {
     display: inline;
   }
 }
+
+.form-group {
+  .form-group {
+    margin-left: 30px; // used at fluentd/settings/out_forward, nested config form
+  }
+}

app/controllers/fluentd/settings/out_forward_controller.rb

@@ -0,0 +1,34 @@
+class Fluentd::Settings::OutForwardController < ApplicationController
+  before_action :login_required
+  before_action :find_fluentd
+
+  def show
+    @setting = Fluentd::Setting::OutForward.new({
+    })
+  end
+
+  def finish
+    @setting = Fluentd::Setting::OutForward.new(setting_params)
+    unless @setting.valid?
+      return render "show"
+    end
+
+    @fluentd.agent.config_append @setting.to_config
+    if @fluentd.agent.running?
+      unless @fluentd.agent.restart
+        @setting.errors.add(:base, @fluentd.agent.log_tail(1).first)
+        return render "show"
+      end
+    end
+    redirect_to fluentd_setting_path(@fluentd)
+  end
+
+  private
+
+  def setting_params
+    params.require(:fluentd_setting_out_forward).permit(*Fluentd::Setting::OutForward::KEYS).merge(
+      params.require(:fluentd_setting_out_forward).permit(:server => Fluentd::Setting::OutForward::Server::KEYS)
+    )
+  end
+
+end

app/helpers/settings_helper.rb

@@ -9,6 +9,18 @@ module SettingsHelper
       html << form.check_box(key, {}, "true", "false")
     when :choice
       html << form.select(key, form.object.values_of(key), opts)
+    when :nested
+      child_data = form.object.class.children[key]
+      klass = child_data[:class]
+      children = form.object.send(key) || {"0" => {}}
+      children.each_pair do |index, child|
+        # TODO: allow append/delete for multiple child
+        form.fields_for("#{key}[#{index}]", klass.new(child), class: "nested-column #{child_data[:multiple] ? "multiple" : ""} well well-sm") do |ff|
+          klass::KEYS.each do |k|
+            html << field(ff, k)
+          end
+        end
+      end
     else
       html << form.text_field(key)
     end

app/models/fluentd/setting/common.rb

@@ -2,9 +2,10 @@ class Fluentd
   module Setting
     module Common
       extend ActiveSupport::Concern
+      include ActiveModel::Model
 
       module ClassMethods
-        attr_accessor :values, :types
+        attr_accessor :values, :types, :children
 
         def choice(key, values)
           @values ||= {}
@@ -12,6 +13,22 @@ class Fluentd
           set_type(:choice, [key])
         end
 
+        def nested(key, klass, options = {})
+          # e.g.:
+          #  <match>
+          #    type forward
+          #    <server>
+          #      ..
+          #    </server>
+          #  </match>
+          @children ||= {}
+          @children[key] = {
+            class: klass,
+            options: options,
+          }
+          set_type(:nested, [key])
+        end
+
         def booleans(*keys)
           # e.g.:
           #   use_ssl true
@@ -36,12 +53,16 @@ class Fluentd
         end
       end
 
+      def child_class(key)
+        self.class.children[key][:class]
+      end
+
       def values_of(key)
-        self.class.values[key] || []
+        self.class.values.try(:[], key) || []
       end
 
       def column_type(key)
-        self.class.types[key] || "string"
+        self.class.types.try(:[], key) || "string"
       end
 
       def conf(key)
@@ -50,6 +71,26 @@ class Fluentd
           boolenan(key)
         when :flag
           flag(key)
+        when :nested
+          klass = child_class(key)
+          send(key).map do |(_, child)|
+            # send("servers")
+            #
+            # "servers" => {
+            #   "0" => {
+            #     "name" => "foo",
+            #     "host" => "bar",
+            #     ..
+            #   },
+            #   "1" => {
+            #     ..
+            #   }
+            # }
+            child_instance = klass.new(child)
+            unless child_instance.empty_value?
+              "\n" + child_instance.to_config(key).gsub(/^/m, "  ")
+            end
+          end.join
         else
           print_if_present(key)
         end
@@ -77,17 +118,33 @@ class Fluentd
         send(key).presence == "true" ? key.to_s : ""
       end
 
-      def to_config
+      def empty_value?
+        config = ""
+        self.class.const_get(:KEYS).each do |key|
+          config << conf(key)
+        end
+        config.empty?
+      end
+
+      def to_config(elm_name = nil)
         indent = "  "
-        config = "<match #{match}>\n"
-        config << "#{indent}type #{plugin_type_name}\n"
+        if elm_name
+          config = "<#{elm_name}>\n"
+        else
+          config = "<match #{match}>\n"
+          config << "#{indent}type #{plugin_type_name}\n"
+        end
         self.class.const_get(:KEYS).each do |key|
           next if key == :match
           config << indent
           config << conf(key)
           config << "\n"
         end
-        config << "</match>\n"
+        if elm_name
+          config << "</#{elm_name}>\n"
+        else
+          config << "</match>\n"
+        end
         config.gsub(/^[ ]*\n/m, "")
       end
     end

app/models/fluentd/setting/out_forward.rb

@@ -0,0 +1,48 @@
+class Fluentd
+  module Setting
+    class OutForward
+      class Server
+        include Common
+        KEYS = [
+          :name, :host, :port, :weight, :standby
+        ].freeze
+
+        attr_accessor(*KEYS)
+
+        flags :standby
+
+        validates :host, presence: true
+      end
+
+      include Common
+
+      KEYS = [
+        :match,
+        :send_timeout, :recover_wait, :heartbeat_type, :heartbeat_interval,
+        :phi_threshold, :hard_timeout,
+        :server
+      ].freeze
+
+      attr_accessor(*KEYS)
+      choice :heartbeat_type, %w(udp tcp)
+      nested :server, Server
+
+      validates :match, presence: true
+      validate :validate_at_least_one_server
+      validate :validate_nested_values
+
+      def validate_at_least_one_server
+        # FIXME: real validation
+        true
+      end
+
+      def validate_nested_values
+        # FIXME: real validation with child class instance
+        self.class.children.inject(true) do |result, child|
+          # result & child.valid?
+        end
+        true
+      end
+    end
+  end
+end

app/views/fluentd/settings/out_forward/_form.html.haml

@@ -0,0 +1,22 @@
+- @setting.errors.full_messages.each do |msg|
+  = msg
+
+= form_for(@setting, url: finish_fluentd_setting_out_forward_path(@fluentd), html: {class: "ignore-rails-error-div"}) do |f|
+  = field(f, :match)
+  = field(f, :server)
+
+  .well.well-sm
+    %h4{"data-toggle" => "collapse", "href" => "#advanced-setting"}
+      = icon('fa-caret-down')
+      = t('terms.advanced_setting')
+    #advanced-setting.collapse
+      = field(f, :send_timeout)
+      = field(f, :recover_wait)
+      = field(f, :heartbeat_type)
+      = field(f, :heartbeat_interval)
+      = field(f, :phi_threshold)
+      = field(f, :hard_timeout)
+  = f.submit t('fluentd.common.finish')   , class: "btn btn-lg btn-primary pull-right"
+  = f.submit t('terms.prev'),   class: "btn btn-lg btn-default", name: "back"
+
+

app/views/fluentd/settings/out_forward/show.html.haml

@@ -0,0 +1,6 @@
+- page_title t(".page_title")
+
+.well
+  = raw t('fluentd.settings.out_forward.option_guide')
+
+= render "form"

app/views/fluentd/settings/show.html.haml

@@ -36,3 +36,7 @@
           = link_to(fluentd_setting_out_mongo_path(@fluentd)) do
             = icon('fa-file-text-o fa-lg')
             = t("fluentd.common.setup_out_mongo")
+        %p
+          = link_to(fluentd_setting_out_forward_path(@fluentd)) do
+            = icon('fa-file-text-o fa-lg')
+            = t("fluentd.common.setup_out_forward")

config/locales/translation_en.yml

@@ -96,6 +96,7 @@ en:
       setup_in_syslog: Setting Syslog readling
       setup_out_td: Setting Treasure Data writing
       setup_out_mongo: Setting MongoDB writing
+      setup_out_forward: forward(TODO)
       finish: Update config
       fluentd_info: Setting info
       recent_errors: "Recently %{days} days errors"
@@ -128,9 +129,12 @@ en:
         out: Output source setting
       edit:
         <<: *fluentd_common
+      out_forward:
+        option_guide: |
+        show:
+          page_title: out_forward(TODO)
       out_td:
         option_guide: |
-          fluent-plugin-td install is required.<br />
         show:
           page_title: Write to Treasure Data setting
       out_mongo:

config/locales/translation_ja.yml

@@ -96,6 +96,7 @@ ja:
       setup_in_syslog: syslog読み込みの設定
       setup_out_td: Treasure Dataへの書き出し設定
       setup_out_mongo: MongoDBへの書き出し設定
+      setup_out_forward: forward(TODO)
       finish: 設定する
       fluentd_info: 設定情報
       recent_errors: "直近 %{days} 日内のエラー"
@@ -129,6 +130,10 @@ ja:
         out: 出力ソースの設定
       edit:
         <<: *fluentd_common
+      out_forward:
+        option_guide: |
+        show:
+          page_title: out_forward(TODO)
       out_td:
         option_guide: |
           fluent-plugin-tdプラグインのインストールが必要です。<br />

config/routes.rb

@@ -33,6 +33,10 @@ Rails.application.routes.draw do
       resource :out_s3, only: ["show"], module: :settings, controller: :out_s3 do
         post "finish"
       end
+
+      resource :out_forward, only: ["show"], module: :settings, controller: :out_forward do
+        post "finish"
+      end
     end
   end