Class: EzPaaS::Helpers::ContainerManager

Inherits:
Object
  • Object
show all
Defined in:
lib/ezpaas/helpers/container_manager.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ContainerManager

Returns a new instance of ContainerManager.



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# File 'lib/ezpaas/helpers/container_manager.rb', line 18

def initialize
  ensure_paths
end

Instance Method Details

#create_slug(src_tar_stream, emitter = nil) ⇒ Object 



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# File 'lib/ezpaas/helpers/container_manager.rb', line 22

def create_slug(src_tar_stream, emitter = nil)

temp_tar = Tempfile.new('ezpaas') # Temporary place to copy the slug tarball

emitter.emit :message, '-----> Creating slug compilation container' if emitter
container = Docker::Container.create({'Image' => 'deis/slugbuilder', 'OpenStdin' => true, 'StdinOnce' => true}, connection)

begin
  # Start the container
  emitter.emit :message, '-----> Starting slug compilation container' if emitter
  container.start

  # Redirect container output to HTTP stream
  container.attach(stdin: src_tar_stream) do |_fd, chunk|
    emitter.emit :message, chunk if emitter
  end

  # Wait for container to finish compiling the slug
  container.wait

  # Kill the container
  emitter.emit :message, '-----> Stopping slug compilation container' if emitter
  begin
    container.stop
  end

  # Copy the tarred slug out of the container
  emitter.emit :message, "-----> Temporarily copying slug from container to #{temp_tar.path}" if emitter
  container.copy('/tmp/slug.tgz') { |chunk| temp_tar.write(chunk) }

  temp_tar.rewind # rewind the temp file for immediate reading

  # Decompress the tarred slug to our final destination
  slug_name = SecureRandom.uuid
  slug_destination = slug_path(slug_name)
  emitter.emit :message, "-----> Untarring slug to #{slug_destination}" if emitter
  tar_extract = Gem::Package::TarReader.new(temp_tar)
  slug_entry = tar_extract.find { |e| e.full_name == 'slug.tgz' }
  File.open(slug_destination, 'wb') do |file|
    File.ez_cp(slug_entry, file)
  end
  temp_tar.close
rescue Exception => ex
  raise
else
  slug_name
  ensure
    emitter.emit :message, "-----> Removing container" if emitter
    # Try to remove the container
    begin
      container.remove
    rescue
      raise
    end
    emitter.emit :message, "-----> Deleting temporary files" if emitter
    temp_tar.close
    temp_tar.unlink
  end

end

#deploy_app(name, slug, config, emitter = nil) ⇒ Object 



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# File 'lib/ezpaas/helpers/container_manager.rb', line 83

def deploy_app(name, slug, config, emitter = nil)

  emitter.emit :message, "-----> Creating temporary slug container to snapshot" if emitter

  # Load the slug into a temporary container to produce an image
  slug_labels = {
    'com.tendigi.appname' => name,
  }

  slug_file = File.open(slug_path(slug), 'rb')
  slug_container = Docker::Container.create({'Image' => 'deis/slugrunner', 'OpenStdin' => true, 'StdinOnce' => true, 'Labels' => slug_labels}, connection)
  slug_container.start
  slug_container.attach(stdin: slug_file) do |_fd, chunk|
    # puts chunk
  end

  slug_image_name = "ezpass/#{name}"

  emitter.emit :message, "-----> Imaging container #{slug_container.id}" if emitter
  slug_image = slug_container.commit(repo: slug_image_name, 'Labels' => slug_labels)
  emitter.emit :message, "-----> Created slug image #{slug_image.id}" if emitter

  slug_container.remove(force: true)
  emitter.emit :message, "-----> Removing temporary slug container #{slug_container.id}" if emitter

  emitter.emit :message, "-----> Starting deployment..." if emitter

  # Start up instances using that image
  config.each do |process, count|

    # iterate over the desired number of instances
    for i in 0 ... count
      container_name = "#{name}-#{process}-#{i}"
      labels = {
        'com.tendigi.appname' => name,
        'com.tendigi.instance' => container_name,
        'com.tendigi.slug' => slug,
        'com.tendigi.process' => process
      }
      container = slug_image.run("start #{process}", { name: container_name, 'Labels' => labels, 'PublishAllPorts' => true })
      emitter.emit :message, "-----> Deployed container #{i + 1} for process type `#{process}`: #{container.id}" if emitter
    end
  end

end

#http_destinations(name) ⇒ Object 



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# File 'lib/ezpaas/helpers/container_manager.rb', line 151

def http_destinations(name)
  containers = Docker::Container.all(filters: { label: [ "com.tendigi.appname=#{name}", "com.tendigi.process=web"]  }.to_json)

  ports = {}

  for container in containers
    for port_info in (container.info['Ports'] || [])
      if port_info['PrivatePort'] == 5000
        ports[container.id] = port_info['PublicPort']
      end
    end
  end

  ports
end

#pull_images ⇒ Object 



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# File 'lib/ezpaas/helpers/container_manager.rb', line 179

def pull_images

  images = [
    'deis/slugbuilder',
    'deis/slugrunner'
  ]

  puts

  images.each do |name|

  	pastel = Pastel.new
  	puts 'Downloading latest image: ' + pastel.blue(name)

    Docker::Image.create({'fromImage' => name, 'tag' => 'latest'}, connection) do |chunk|
      fragments = chunk.split "\r\n"
      fragments.each do |fragment|
      	data = JSON.parse(fragment)
      	if id = data['id']
      		# puts "#{id}: #{data['status']}" #off for now
      	else
      		puts pastel.green(data['status'].rstrip)
      	end
      	
      end
    end

    puts
  end

end

#read_procfile(slug_name) ⇒ Object 



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# File 'lib/ezpaas/helpers/container_manager.rb', line 167

def read_procfile(slug_name)
  tar_extract = Gem::Package::TarReader.new(Zlib::GzipReader.open(slug_path(slug_name)))
  tar_extract.rewind # The extract has to be rewinded after every iteration
  tar_extract.each do |entry|
    if entry.full_name == './Procfile' && entry.file?
      return YAML.load(entry.read)
    end
  end
ensure
  tar_extract.close
end

#undeploy_app(name, emitter = nil) ⇒ Object 



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# File 'lib/ezpaas/helpers/container_manager.rb', line 129

def undeploy_app(name, emitter = nil)

  emitter.emit :message, "-----> Un-deploying #{name}" if emitter

  containers = Docker::Container.all(all: true, filters: { label: [ "com.tendigi.appname=#{name}"  ]  }.to_json)

  containers.each do |c|
    emitter.emit :message, "-----> Removing container #{c.id}" if emitter
    c.remove(force: true)
  end

  emitter.emit :message, "-----> Deleting slug images for #{name}" if emitter

  images = Docker::Image.all(all: true, filters: { label: [ "com.tendigi.appname=#{name}"  ]  }.to_json)

  images.each do |i|
    emitter.emit :message, "-----> Removing image #{i.id}" if emitter
    i.remove
  end

end