Class: MongoOplogBackup::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/mongo_oplog_backup/command.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command, options = {}) ⇒ Command

command must be an array containing the command and arguments



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# File 'lib/mongo_oplog_backup/command.rb', line 25

def initialize(command, options={})
  @command = command
  @standard_output = ''
  @standard_error = ''
  @out_blocks = []
  @err_blocks = []

  logger = options[:logger] || Command.logger

  if logger
    log_output(logger)
  end

  on_stdout do |data|
    @standard_output << data
  end
  on_stderr do |data|
    @standard_error << data
  end
end

Instance Attribute Details

#command ⇒ Object (readonly)

Returns the value of attribute command.



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# File 'lib/mongo_oplog_backup/command.rb', line 15

def command
  @command
end

#standard_error ⇒ Object (readonly)

Returns the value of attribute standard_error.



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# File 'lib/mongo_oplog_backup/command.rb', line 17

def standard_error
  @standard_error
end

#standard_output ⇒ Object (readonly)

Returns the value of attribute standard_output.



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# File 'lib/mongo_oplog_backup/command.rb', line 16

def standard_output
  @standard_output
end

#status ⇒ Object (readonly)

Returns the value of attribute status.



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# File 'lib/mongo_oplog_backup/command.rb', line 18

def status
  @status
end

Class Method Details

.execute(command, options = {}) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 20

def self.execute(command, options={})
  Command.new(command, options).run
end

.logger ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 11

def self.logger
  @logger
end

.logger=(logger) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 7

def self.logger= logger
  @logger = logger
end

Instance Method Details

#log_output(logger) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 62

def log_output(logger)
  on_stdout_line do |line|
    logger.debug(line)
  end
  on_stderr_line do |line|
    logger.error(line)
  end
end

#on_stderr(&block) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 54

def on_stderr &block
  @err_blocks << block
end

#on_stderr_line(&block) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 50

def on_stderr_line &block
  on_stderr(&lines_proc(&block))
end

#on_stdout(&block) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 58

def on_stdout &block
  @out_blocks << block
end

#on_stdout_line(&block) ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 46

def on_stdout_line &block
  on_stdout(&lines_proc(&block))
end

#raise! ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 103

def raise!
  unless status.success?
    raise "Command failed with exit code #{status.exitstatus}"
  end
  self
end

#run ⇒ Object 



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# File 'lib/mongo_oplog_backup/command.rb', line 71

def run
  @status = Open3.popen3(*command) do |stdin, stdout, stderr, wait_thr|
    stdin.close_write
    # until all_eof([stdout, stderr])
    still_open = [stdout, stderr]
    until still_open.empty?
      handles = IO.select(still_open, nil, nil, 0.001)

      unless handles.nil?
        read_available_data(stdout) do |data|
          @out_blocks.each do |block|
            block.call(data)
          end
        end if handles[0].include?(stdout)

        read_available_data(stderr) do |data|
          @err_blocks.each do |block|
            block.call(data)
          end
        end if handles[0].include?(stderr)
      end

      still_open.delete_if { |s| s.closed? }
      sleep 0.001
    end

    wait_thr.value
  end
  raise!
  self
end