Class: Docker::Utils

Inherits:
Object
  • Object
show all
Defined in:
lib/docker_rack/docker_utils.rb

Class Method Summary collapse

Class Method Details

.check_port(check) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 116

def self.check_port(check)
  puts "Checking port #{check['ip']}:#{check['port']} availability." if LOG_LEVEL == 'DEBUG'
  result = is_port_open?(check['ip'], check['port'])
  puts "Result: #{result}" if LOG_LEVEL == 'DEBUG'
  return result
end

.check_rest(check) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 123

def self.check_rest(check)
  puts "Checking HTTP response #{check['uri']}." if LOG_LEVEL == 'DEBUG'
  result = is_http_present?(check['uri'])
  puts "Result: #{result}" if LOG_LEVEL == 'DEBUG'
  return result
end

.check_script(check) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 130

def self.check_script(check)
  `#{check['script']}`
  return $?.to_i == 0
end

.containers_by_name(name) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 175

def self.containers_by_name(name)
  containers = `docker ps -a`
  ps = []
  containers.each_line { |line| if line.include?(name) then ps << line.strip.partition(' ').first end }
  ps
end

.create_docker_command(info) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 12

def self.create_docker_command(info)
  docker_cmd = ['docker']
  docker_cmd.push info['action'] || 'run -d'
  docker_cmd.push "--name=\"#{info['name']}\""
  docker_cmd.push "--add-host=\"dockerhost:#{dockerhost}\"" unless info.key? 'net'
  docker_cmd.push "--hostname=\"#{info['hostname']}\"" if info.key? 'hostname'
  docker_cmd.push info['environment'].map { |k, v| "-e #{k.to_s}=\"#{v}\"" } if info.key? 'environment'
  docker_cmd.push info['ports'].map { |port| "-p #{mirror_if_single(port)}" } if info.key? 'ports'
  docker_cmd.push info['expose'].map { |port| "--expose=#{port}" } if info.key? 'expose'
  docker_cmd.push info['links'].map { |link| "--link #{link}" } if info.key? 'links'
  docker_cmd.push info['volumes_from'].map { |volume| "--volumes-from \"#{volume}\"" } if info.key? 'volumes_from'
  docker_cmd.push info['volumes'].map { |volume| "-v #{quote_parts(volume)}" } if info.key? 'volumes'
  docker_cmd.push "--net=\"#{info['net']}\"" if info.key? 'net'
  docker_cmd.push '--privileged' if info['privileged'] == true
  docker_cmd.push "--log-driver=\"#{info['log-driver']}\"" if info.key? 'log-driver'
  docker_cmd.push info['log-opt'].map { |k, v| "--log-opt #{k.to_s}=\"#{v}\"" } if info.key? 'log-opt'
  docker_cmd.push info['image']
  docker_cmd.push info['command'] if info.key? 'command'
  return docker_cmd.join(' ')
end

.detect_check(check) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 107

def self.detect_check(check)
  return if check.key?('type')
  if check.key?('port')
    check['type'] = 'port'
  elsif check.key?('uri')
    check['type'] = 'rest'
  end
end

.dockerhost ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 6

def self.dockerhost
  @dockerhost = ENV['DOCKER_HOST']
  return nil if @dockerhost.nil?
  @dockerhost[/tcp:\/\/([^:]+)/, 1]
end

.get_image_id(name) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 182

def self.get_image_id(name)
  images = `docker images`
  img = []
  images.each_line { |line| if line.include?(name) then img << line.strip.partition(' ').first end }
  img.first
end

.is_http_present?(url) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/docker_rack/docker_utils.rb', line 140

def self.is_http_present?(url)
  begin
    uri = URI(url)
    request = Net::HTTP::Get.new(uri.request_uri)
    response = Net::HTTP.start(uri.host, uri.port, :read_timeout => 500) {|http| http.request(request)}

    return response.code == '200'
  rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
    # ignored
  end
  return false
end

.is_port_open?(ip, port) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/docker_rack/docker_utils.rb', line 153

def self.is_port_open?(ip, port)
  begin
    Timeout::timeout(1) do
      begin
        s = TCPSocket.new(ip, port)
        s.close
        return true
      rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
        return false
      end
    end
  rescue Timeout::Error
    # ignored
  end

  return false
end

.mirror_if_single(text) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 37

def self.mirror_if_single(text)
  parts = text.to_s.split(':')
  parts.count == 1 ? "#{text}:#{text}" : text
end

.present?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/docker_rack/docker_utils.rb', line 171

def self.present?(name)
  !containers_by_name(name).empty?
end

.put_char(str) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 135

def self.put_char(str)
  print str
  $stdout.flush
end

.quote_parts(text) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 33

def self.quote_parts(text)
  text.split(':').map { |s| "\"#{s}\""}.join(':')
end

.start_container(info) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 72

def self.start_container(info)
  command = create_docker_command(info)
  puts command if LOG_LEVEL == 'DEBUG'
  if present?(info['name'])
    skip_first_sleep = true
    puts 'Detected as running. Skipping ....' # if LOG_LEVEL == 'DEBUG'
  else
    `#{command}`
  end
  Array(info['checks']).each do |check|
    try = (check['retry'] || 3).to_i
    interval = (check['interval'] || 2).to_i
    check['ip'] ||= dockerhost
    detect_check(check)
    while true
      sleep interval unless skip_first_sleep
      skip_first_sleep = false
      put_char '.' if LOG_LEVEL != 'DEBUG'
      case check['type']
        when 'port'
          break if check_port(check)
        when 'rest'
          break if check_rest(check)
        when 'script'
          break if check_script(check)
        else
          puts 'Unrecognizable check type. Skipping ...'
      end
      try -= 1
      abort '  Health check failed all retries' if try == 0
    end
    puts
  end
end

.stop_container(container_template) ⇒ Object 



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# File 'lib/docker_rack/docker_utils.rb', line 42

def self.stop_container(container_template)

  name = container_template['name']
  # containers = `docker ps`
  ps = containers_by_name(name)
  ps.each do |line|
    if line != ''
      cmd = "docker inspect -f {{.State.Running}} #{line}"
      puts cmd if LOG_LEVEL == 'DEBUG'
      is_running = `#{cmd}`.strip
      if is_running == 'true'
        cmd = "docker kill #{line}"
        puts cmd if LOG_LEVEL == 'DEBUG'
        `#{cmd}`
      else
        puts 'Container not running. Nothing to kill. Skipping...'
      end
    end
  end

  ps = containers_by_name(name)
  ps.each do |line|
    if line != ''
      cmd = "docker rm #{line}"
      puts cmd if LOG_LEVEL == 'DEBUG'
      `#{cmd}`
    end
  end
end