Module: Docker::Util

Includes:
Error
Defined in:
lib/docker/util.rb

Overview

This module holds shared logic that doesn’t really belong anywhere else in the gem.

Class Method Summary collapse

Class Method Details

.attach_for(block, msg_stack, tty = false) ⇒ Object

Attaches to a HTTP stream



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# File 'lib/docker/util.rb', line 13

def attach_for(block, msg_stack, tty = false)
  # If TTY is enabled expect raw data and append to stdout
  if tty
    attach_for_tty(block, msg_stack)
  else
    attach_for_multiplex(block, msg_stack)
  end
end

.attach_for_multiplex(block, msg_stack) ⇒ Object 



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# File 'lib/docker/util.rb', line 30

def attach_for_multiplex(block, msg_stack)
  messages = Docker::Messages.new
  lambda do |c,r,t|
    messages = messages.decipher_messages(c)
    msg_stack.append(messages)

    unless block.nil?
      messages.stdout_messages.each do |msg|
        block.call(:stdout, msg)
      end
      messages.stderr_messages.each do |msg|
        block.call(:stderr, msg)
      end
    end
  end
end

.attach_for_tty(block, msg_stack) ⇒ Object 



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# File 'lib/docker/util.rb', line 22

def attach_for_tty(block, msg_stack)
  return lambda do |c,r,t|
    msg_stack.stdout_messages << c
    msg_stack.all_messages << c
    block.call c if block
  end
end

.build_auth_header(credentials) ⇒ Object 



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# File 'lib/docker/util.rb', line 155

def build_auth_header(credentials)
  credentials = credentials.to_json if credentials.is_a?(Hash)
  encoded_creds = Base64.encode64(credentials).gsub(/\n/, '')
  {
    'X-Registry-Auth' => encoded_creds
  }
end

.build_config_header(credentials) ⇒ Object 



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# File 'lib/docker/util.rb', line 163

def build_config_header(credentials)
  if credentials.is_a?(String)
    credentials = JSON.parse(credentials, symbolize_names: true)
  end
  header = {
    "configs" => {
      credentials[:serveraddress].to_s => {
        "username" => credentials[:username].to_s,
        "password" => credentials[:password].to_s,
        "email" => credentials[:email].to_s
      }
    }
  }.to_json

  encoded_header = Base64.encode64(header).gsub(/\n/, '')

  {
    'X-Registry-Config' => encoded_header
  }
end

.create_dir_tar(directory) ⇒ Object 



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# File 'lib/docker/util.rb', line 115

def create_dir_tar(directory)
  cwd = FileUtils.pwd
  tempfile_name = Dir::Tmpname.create('out') {}
  tempfile = File.open(tempfile_name, 'wb+')
  FileUtils.cd(directory)
  Archive::Tar::Minitar.pack('.', tempfile)
  File.new(tempfile.path, 'r')
ensure
  FileUtils.cd(cwd)
end

.create_tar(hash = {}) ⇒ Object 



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# File 'lib/docker/util.rb', line 105

def create_tar(hash = {})
  output = StringIO.new
  Gem::Package::TarWriter.new(output) do |tar|
    hash.each do |file_name, input|
      tar.add_file(file_name, 0640) { |tar_file| tar_file.write(input) }
    end
  end
  output.tap(&:rewind).string
end

.debug(msg) ⇒ Object 



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# File 'lib/docker/util.rb', line 47

def debug(msg)
  Docker.logger.debug(msg) if Docker.logger
end

.extract_id(body) ⇒ Object

Raises:



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# File 'lib/docker/util.rb', line 126

def extract_id(body)
  body.lines.to_a.reverse.each do |line|
    if (id = line.match(/Successfully built ([a-f0-9]+)/)) && !id[1].empty?
      return id[1]
    end
  end
  raise UnexpectedResponseError, "Couldn't find id: #{body}"
end

.file_hash_from_paths(local_paths) ⇒ Object

Convenience method to get the file hash corresponding to an array of local paths.



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# File 'lib/docker/util.rb', line 137

def file_hash_from_paths(local_paths)
  local_paths.each_with_object({}) do |local_path, file_hash|
    unless File.exist?(local_path)
      raise ArgumentError, "#{local_path} does not exist."
    end

    basename = File.basename(local_path)
    if File.directory?(local_path)
      tar = create_dir_tar(local_path)
      file_hash[basename] = tar.read
      tar.close
      FileUtils.rm(tar.path)
    else
      file_hash[basename] = File.read(local_path)
    end
  end
end

.fix_json(body) ⇒ Object 



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# File 'lib/docker/util.rb', line 101

def fix_json(body)
  parse_json("[#{body.gsub(/}\s*{/, '},{')}]")
end

.hijack_for(stdin, block, msg_stack, tty) ⇒ Object 



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# File 'lib/docker/util.rb', line 51

def hijack_for(stdin, block, msg_stack, tty)
  attach_block = attach_for(block, msg_stack, tty)

  lambda do |socket|
    debug "hijack: hijacking the HTTP socket"
    threads = []

    debug "hijack: starting stdin copy thread"
    threads << Thread.start do
      debug "hijack: copying stdin => socket"
      IO.copy_stream stdin, socket

      debug "hijack: closing write end of hijacked socket"
      socket.close_write
    end

    debug "hijack: starting hijacked socket read thread"
    threads << Thread.start do
      debug "hijack: reading from hijacked socket"

      begin
        while chunk = socket.readpartial(512)
          debug "hijack: got #{chunk.bytesize} bytes from hijacked socket"
          attach_block.call chunk, nil, nil
        end
      rescue EOFError
      end

      debug "hijack: killing stdin copy thread"
      threads.first.kill
    end

    threads.each(&:join)
  end
end

.parse_json(body) ⇒ Object 



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# File 'lib/docker/util.rb', line 87

def parse_json(body)
  JSON.parse(body) unless body.nil? || body.empty? || (body == 'null')
rescue JSON::ParserError => ex
  raise UnexpectedResponseError, ex.message
end

.parse_repo_tag(str) ⇒ Object 



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# File 'lib/docker/util.rb', line 93

def parse_repo_tag(str)
  if match = str.match(/\A(.*):([^:]*)\z/)
    match.captures
  else
    [str, '']
  end
end