Class: Falcon::Adapters::Input

Inherits:
Object
  • Object
show all
Defined in:
lib/falcon/adapters/input.rb

Overview

The input stream is an IO-like object which contains the raw HTTP POST data. When applicable, its external encoding must be “ASCII-8BIT” and it must be opened in binary mode, for Ruby 1.9 compatibility. The input stream must respond to gets, each, read and rewind.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(body) ⇒ Input

Returns a new instance of Input.



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# File 'lib/falcon/adapters/input.rb', line 28

def initialize(body)
  @body = body
  
  # Will hold remaining data in `#read`.
  @buffer = nil
  @finished = @body.nil?
end

Instance Attribute Details

#body ⇒ Object (readonly)

Returns the value of attribute body.



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# File 'lib/falcon/adapters/input.rb', line 36

def body
  @body
end

Instance Method Details

#close ⇒ Object

close must never be called on the input stream. huh?



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# File 'lib/falcon/adapters/input.rb', line 110

def close
  @body.finish
end

#each(&block) ⇒ Object

each must be called without arguments and only yield Strings.



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# File 'lib/falcon/adapters/input.rb', line 39

def each(&block)
  return to_enum unless block_given?
  
  while chunk = gets
    yield chunk
  end
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/falcon/adapters/input.rb', line 93

def eof?
  @finished and @buffer.nil?
end

#gets ⇒ String?

gets must be called without arguments and return a string, or nil on EOF.

Returns:

  • (String, nil) —

    The next chunk from the body.



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# File 'lib/falcon/adapters/input.rb', line 99

def gets
  if @buffer.nil?
    return read_next
  else
    buffer = @buffer
    @buffer = nil
    return buffer
  end
end

#read(length = nil, buffer = nil) ⇒ Object

read behaves like IO#read. Its signature is read([length, [buffer]]). If given, length must be a non-negative Integer (>= 0) or nil, and buffer must be a String and may not be nil. If length is given and not nil, then this method reads at most length bytes from the input stream. If length is not given or nil, then this method reads all data until EOF. When EOF is reached, this method returns nil if length is given and not nil, or “” if length is not given or is nil. If buffer is given, then the read data will be placed into buffer instead of a newly created String object.

Parameters:

  • length (Integer) (defaults to: nil) —

    the amount of data to read

  • buffer (String) (defaults to: nil) —

    the buffer which will receive the data

Returns:

  • a buffer containing the data



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# File 'lib/falcon/adapters/input.rb', line 69

def read(length = nil, buffer = nil)
  buffer ||= Async::IO::BinaryString.new
  buffer.clear
  
  until buffer.bytesize == length
    @buffer = read_next if @buffer.nil?
    break if @buffer.nil?
    
    remaining_length = length - buffer.bytesize if length
    
    if remaining_length && remaining_length < @buffer.bytesize
      buffer << @buffer.byteslice(0, remaining_length)
      @buffer = @buffer.byteslice(remaining_length..-1)
    else
      buffer << @buffer
      @buffer = nil
    end
  end
  
  return nil if buffer.empty? && length && length > 0
  
  return buffer
end

#respond_to?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/falcon/adapters/input.rb', line 57

def respond_to?(name, *)
  if name == :rewind
    @body.respond_to?(:rewind)
  else
    super
  end
end

#rewind ⇒ Object

rewind must be called without arguments. It rewinds the input stream back to the beginning. It must not raise Errno::ESPIPE: that is, it may not be a pipe or a socket. Therefore, handler developers must buffer the input data into some rewindable object if the underlying input stream is not rewindable.



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# File 'lib/falcon/adapters/input.rb', line 48

def rewind
  if @body
    # If the body is not rewindable, this will fail.
    @body.rewind
    @buffer = nil
    @finished = false
  end
end