Class: HTTPX::TCP

Inherits:
Object
  • Object
show all
Includes:
Loggable
Defined in:
lib/httpx/io/tcp.rb

Direct Known Subclasses

SSL, UNIX

Constant Summary

Constants included from Loggable

Loggable::COLORS, Loggable::USE_DEBUG_LOG

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Loggable

#log, #log_exception, #log_redact

Constructor Details

#initialize(origin, addresses, options) ⇒ TCP

Returns a new instance of TCP.



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# File 'lib/httpx/io/tcp.rb', line 15

def initialize(origin, addresses, options)
  @state = :idle
  @keep_open = false
  @addresses = []
  @ip_index = -1
  @ip = nil
  @hostname = origin.host
  @options = options
  @fallback_protocol = @options.fallback_protocol
  @port = origin.port
  @interests = :w
  if @options.io
    @io = case @options.io
          when Hash
            @options.io[origin.authority]
          else
            @options.io
    end
    raise Error, "Given IO objects do not match the request authority" unless @io

    _, _, _, ip = @io.addr
    @ip = Resolver::Entry.new(ip)
    @addresses << @ip
    @keep_open = true
    @state = :connected
  else
    add_addresses(addresses)
  end
  @ip_index = @addresses.size - 1
end

Instance Attribute Details

#addresses ⇒ Object (readonly)

Returns the value of attribute addresses.



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# File 'lib/httpx/io/tcp.rb', line 11

def addresses
  @addresses
end

#interests ⇒ Object (readonly)

Returns the value of attribute interests.



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# File 'lib/httpx/io/tcp.rb', line 11

def interests
  @interests
end

#ip ⇒ Object (readonly) Also known as: host

Returns the value of attribute ip.



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# File 'lib/httpx/io/tcp.rb', line 11

def ip
  @ip
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/httpx/io/tcp.rb', line 11

def port
  @port
end

#state ⇒ Object (readonly)

Returns the value of attribute state.



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# File 'lib/httpx/io/tcp.rb', line 11

def state
  @state
end

Instance Method Details

#add_addresses(addrs) ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 50

def add_addresses(addrs)
  return if addrs.empty?

  ip_index = @ip_index || (@addresses.size - 1)
  if addrs.first.ipv6?
    # should be the next in line
    @addresses = [*@addresses[0, ip_index], *addrs, *@addresses[ip_index..-1]]
  else
    @addresses.unshift(*addrs)
  end
  @ip_index += addrs.size
end

#addresses? ⇒ Boolean

eliminates expired entries and returns whether there are still any left.

Returns:

  • (Boolean) 


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# File 'lib/httpx/io/tcp.rb', line 64

def addresses?
  prev_addr_size = @addresses.size

  @addresses.delete_if(&:expired?).sort! do |addr1, addr2|
    if addr1.ipv6?
      addr2.ipv6? ? 0 : 1
    else
      addr2.ipv6? ? -1 : 0
    end
  end

  @ip_index = @addresses.size - 1 if prev_addr_size != @addresses.size

  @addresses.any?
end

#close ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 181

def close
  return if @keep_open || closed?

  begin
    @io.close
  ensure
    transition(:closed)
  end
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/httpx/io/tcp.rb', line 195

def closed?
  @state == :idle || @state == :closed
end

#connect ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 88

def connect
  return unless closed?

  if @addresses.empty?
    # an idle connection trying to connect with no available addresses is a connection
    # out of the initial context which is back to the DNS resolution loop. This may
    # happen in a fiber-aware context where a connection reconnects with expired addresses,
    # and context is passed back to a fiber on the same connection while waiting for the
    # DNS answer.
    log { "tried connecting while resolving, skipping..." }

    return
  end

  if !@io || @io.closed?
    transition(:idle)
    @io = build_socket
  end
  try_connect
rescue Errno::EHOSTUNREACH,
       Errno::ENETUNREACH => e
  @ip_index -= 1

  raise e if @ip_index.negative?

  log { "failed connecting to #{@ip} (#{e.message}), evict from cache and trying next..." }
  Resolver.cached_lookup_evict(@hostname, @ip)

  @io = build_socket
  retry
rescue Errno::ECONNREFUSED,
       Errno::EADDRNOTAVAIL,
       SocketError,
       IOError => e
  @ip_index -= 1

  raise e if @ip_index.negative?

  log { "failed connecting to #{@ip} (#{e.message}), trying next..." }
  @io = build_socket
  retry
rescue Errno::ETIMEDOUT => e
  @ip_index -= 1

  raise ConnectTimeoutError.new(@options.timeout[:connect_timeout], e.message) if @ip_index.negative?

  log { "failed connecting to #{@ip} (#{e.message}), trying next..." }

  @io = build_socket
  retry
end

#connected? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/httpx/io/tcp.rb', line 191

def connected?
  @state == :connected
end

#inspect ⇒ Object

:nocov:



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# File 'lib/httpx/io/tcp.rb', line 200

def inspect
  "#<#{self.class}:#{object_id} " \
    "#{@ip}:#{@port} " \
    "@state=#{@state} " \
    "@hostname=#{@hostname} " \
    "@addresses=#{@addresses} " \
    "@state=#{@state}>"
end

#protocol ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 84

def protocol
  @fallback_protocol
end

#read(size, buffer) ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 158

def read(size, buffer)
  ret = @io.read_nonblock(size, buffer, exception: false)
  if ret == :wait_readable
    buffer.clear
    return 0
  end
  return if ret.nil?

  log { "READ: #{buffer.bytesize} bytes..." }
  buffer.bytesize
end

#socket ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 46

def socket
  @io
end

#to_io ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 80

def to_io
  @io.to_io
end

#write(buffer) ⇒ Object 



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# File 'lib/httpx/io/tcp.rb', line 170

def write(buffer)
  siz = @io.write_nonblock(buffer, exception: false)
  return 0 if siz == :wait_writable
  return if siz.nil?

  log { "WRITE: #{siz} bytes..." }

  buffer.shift!(siz)
  siz
end