Class: Rack::Process

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/process/version.rb,
lib/rack/process/net_string.rb,
lib/rack/process/worker/rack_input.rb,
lib/rack/process/worker.rb,
lib/rack/process/error.rb,
lib/rack/process/json.rb,
lib/rack/process.rb

Defined Under Namespace

Modules: JSON, NetString Classes: Error, Worker

Constant Summary collapse

VERSION = 
"0.0.2"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config_path) ⇒ Process

Returns a new instance of Process.

Raises:

  • (ArgumentError) 


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# File 'lib/rack/process.rb', line 6

def initialize config_path
  @config_path = config_path
  @config_path = ::File.join @config_path, "config.ru" if ::File.directory? @config_path
  @config_path = ::File.absolute_path @config_path

  raise ArgumentError, "Rackup file #{config_path} does not exist." unless ::File.exists? config_path

  at_exit { close }
end

Instance Attribute Details

#config_path ⇒ Object (readonly)

Returns the value of attribute config_path.



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# File 'lib/rack/process.rb', line 4

def config_path
  @config_path
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/rack/process.rb', line 16

def call env
  write "request"
  write JSON.encode env.reject { |key| key[/\A(?:rack|async)/] }

  status = headers = body = nil

  while status.nil?
    case command = read
    when "status"
      status = read.to_i
    when "input"
      write "input"
      write env["rack.input"].read
    when "error"
      raise Error, "Rack process error: #{JSON.decode(read).inspect}"
    else
      raise Error, "Expecting status, got #{command}"
    end
  end

  while headers.nil?
    case command = read
    when "headers"
      headers = JSON.decode read
    when "input"
      write "input"
      write env["rack.input"].read
    when "error"
      raise Error, "Rack process error: #{JSON.decode(read).inspect}"
    else
      raise Error, "Expecting headers, got #{command}"
    end
  end

  body = Enumerator.new do |body|
    while command = read
      case command
      when "output"
        body << read
      when "input"
        write "input"
        write env['rack.input'].read
      when "done"
        break
      when "error"
        raise Error, "Rack process error: #{JSON.decode(read).inspect}"
      else
        raise Error, "Expecting output, got #{command}"
      end
    end
  end

  [status, headers, body]
end