Class: Excon::Socket

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/excon/socket.rb

Direct Known Subclasses

SSLSocket

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}, proxy = nil) ⇒ Socket

Returns a new instance of Socket.



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# File 'lib/excon/socket.rb', line 11

def initialize(params = {}, proxy = nil)
  @params, @proxy = params, proxy
  @read_buffer = ''
  @eof = false

  connect
end

Instance Attribute Details

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/excon/socket.rb', line 6

def params
  @params
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/excon/socket.rb', line 19

def connect
  @socket = nil
  exception = nil

  addrinfo = if @proxy
    ::Socket.getaddrinfo(@proxy[:host], @proxy[:port].to_i, ::Socket::Constants::AF_UNSPEC, ::Socket::Constants::SOCK_STREAM)
  else
    ::Socket.getaddrinfo(@params[:host], @params[:port].to_i, ::Socket::Constants::AF_UNSPEC, ::Socket::Constants::SOCK_STREAM)
  end

  addrinfo.each do |_, port, _, ip, a_family, s_type|
    # nonblocking connect
    begin
      sockaddr = ::Socket.sockaddr_in(port, ip)

      socket = ::Socket.new(a_family, s_type, 0)

      if @params[:nonblock]
        socket.connect_nonblock(sockaddr)
      else
        begin
          Timeout.timeout(@params[:connect_timeout]) do
            socket.connect(sockaddr)
          end
        rescue Timeout::Error
          raise Excon::Errors::Timeout.new('connect timeout reached')
        end
      end

      @socket = socket
      break
    rescue Errno::EINPROGRESS
      unless IO.select(nil, [socket], nil, @params[:connect_timeout])
        raise(Excon::Errors::Timeout.new("connect timeout reached"))
      end
      begin
        socket.connect_nonblock(sockaddr)

        @socket = socket
        break
      rescue Errno::EISCONN
        @socket = socket
        break
      rescue SystemCallError => exception
        socket.close
        next
      end
    rescue SystemCallError => exception
      socket.close
      next
    end
  end

  unless @socket
    # this will be our last encountered exception
    raise exception
  end
end

#read(max_length = nil) ⇒ Object 



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# File 'lib/excon/socket.rb', line 78

def read(max_length=nil)
  return nil if @eof
  if @eof
    nil
  elsif @params[:nonblock]
    begin
      if max_length
        until @read_buffer.length >= max_length
          @read_buffer << @socket.read_nonblock(max_length - @read_buffer.length)
        end
      else
        while true
          @read_buffer << @socket.read_nonblock(CHUNK_SIZE)
        end
      end
    rescue OpenSSL::SSL::SSLError => error
      if error.message == 'read would block'
        if IO.select([@socket], nil, nil, @params[:read_timeout])
          retry
        else
          raise(Excon::Errors::Timeout.new("read timeout reached"))
        end
      else
        raise(error)
      end
    rescue Errno::EAGAIN, Errno::EWOULDBLOCK, IO::WaitReadable
      if IO.select([@socket], nil, nil, @params[:read_timeout])
        retry
      else
        raise(Excon::Errors::Timeout.new("read timeout reached"))
      end
    rescue EOFError
      @eof = true
    end
    if max_length
      @read_buffer.slice!(0, max_length)
    else
      # read until EOFError, so return everything
      @read_buffer.slice!(0, @read_buffer.length)
    end
  else
    begin
      Timeout.timeout(@params[:read_timeout]) do
        @socket.read(max_length)
      end
    rescue Timeout::Error
      raise Excon::Errors::Timeout.new('read timeout reached')
    end
  end
end

#write(data) ⇒ Object 



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# File 'lib/excon/socket.rb', line 129

def write(data)
  if @params[:nonblock]
    # We normally return from the return in the else block below, but
    # we guard that data is still something in case we get weird
    # values and String#[] returns nil. (This behavior has been observed
    # in the wild, so this is a simple defensive mechanism)
    while data
      begin
        # I wish that this API accepted a start position, then we wouldn't
        # have to slice data when there is a short write.
        written = @socket.write_nonblock(data)
      rescue OpenSSL::SSL::SSLError => error
        if error.message == 'write would block'
          if IO.select(nil, [@socket], nil, @params[:write_timeout])
            retry
          else
            raise(Excon::Errors::Timeout.new("write timeout reached"))
          end
        else
          raise(error)
        end
      rescue Errno::EAGAIN, Errno::EWOULDBLOCK, IO::WaitWritable
        if IO.select(nil, [@socket], nil, @params[:write_timeout])
          retry
        else
          raise(Excon::Errors::Timeout.new("write timeout reached"))
        end
      else
        # Fast, common case.
        # The >= seems weird, why would it have written MORE than we
        # requested. But we're getting some weird behavior when @socket
        # is an OpenSSL socket, where it seems like it's saying it wrote
        # more (perhaps due to SSL packet overhead?).
        #
        # Pretty weird, but this is a simple defensive mechanism.
        return if written >= data.size

        # This takes advantage of the fact that most ruby implementations
        # have Copy-On-Write strings. Thusly why requesting a subrange
        # of data, we actually don't copy data because the new string
        # simply references a subrange of the original.
        data = data[written, data.size]
      end
    end
  else
    begin
      Timeout.timeout(@params[:write_timeout]) do
        @socket.write(data)
      end
    rescue Timeout::Error
      Excon::Errors::Timeout.new('write timeout reached')
    end
  end
end