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Filename : list_instances_command.rb
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#  Phusion Passenger - https://www.phusionpassenger.com/
#  Copyright (c) 2014-2025 Asynchronous B.V.
#
#  "Passenger", "Phusion Passenger" and "Union Station" are registered
#  trademarks of Asynchronous B.V.
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.

require 'optparse'
PhusionPassenger.require_passenger_lib 'constants'
PhusionPassenger.require_passenger_lib 'admin_tools/instance_registry'
PhusionPassenger.require_passenger_lib 'config/command'
PhusionPassenger.require_passenger_lib 'config/utils'
PhusionPassenger.require_passenger_lib 'utils/json'

module PhusionPassenger
  module Config

    class ListInstancesCommand < Command
      include PhusionPassenger::Config::Utils

      def run
        parse_options
        instances = AdminTools::InstanceRegistry.new.list
        if @options[:json]
          print_json(instances)
        elsif instances.empty?
          print_no_instances_running
        else
          print_instances(instances)
        end
      end

    private
      def self.create_option_parser(options)
        OptionParser.new do |opts|
          nl = "\n" + ' ' * 37
          opts.banner = "Usage: passenger-config list-instances [OPTIONS] <PID>\n"
          opts.separator ""
          opts.separator "  List all running #{PROGRAM_NAME} instances."
          opts.separator ""

          opts.on("--json", "Print output in JSON format") do
            options[:json] = true
          end
          opts.on("-q", "--quiet", "Don't print anything if there are no #{PROGRAM_NAME} instances running") do
            options[:quiet] = true
          end
          opts.on("-h", "--help", "Show this help") do
            options[:help] = true
          end
        end
      end

      def help
        puts @parser
      end

      def parse_options
        super
        if !@argv.empty?
          help
          abort
        end
      end

      def print_no_instances_running
        if !@options[:quiet]
          puts "There are no #{PROGRAM_NAME} instances running."
        end
      end

      def print_json(instances)
        result = []
        instances.each do |instance|
          result << instance.as_json
        end
        puts PhusionPassenger::Utils::JSON.generate(result)
      end

      def print_instances(instances)
        list_all_passenger_instances(instances, false)
      end
    end

  end # module Config
end # module PhusionPassenger