Class: HTTPX::Connection

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Callbacks, Loggable
Defined in:
lib/httpx/connection.rb

Overview

The Connection can be watched for IO events.

It contains the io object to read/write from, and knows what to do when it can.

It defers connecting until absolutely necessary. Connection should be triggered from the IO selector (until then, any request will be queued).

A connection boots up its parser after connection is established. All pending requests will be redirected there after connection.

A connection can be prevented from closing by the parser, that is, if there are pending requests. This will signal that the connection was prematurely closed, due to a possible number of conditions:

  • Remote peer closed the connection (“Connection: close”);

  • Remote peer doesn’t support pipelining;

A connection may also route requests for a different host for which the io was connected to, provided that the IP is the same and the port and scheme as well. This will allow to share the same socket to send HTTP/2 requests to different hosts.

Defined Under Namespace

Classes: HTTP1, HTTP2

Constant Summary

Constants included from Loggable

Loggable::COLORS, Loggable::USE_DEBUG_LOG

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Callbacks

#callbacks_for?, #emit, #on, #once

Methods included from Loggable

#log, #log_exception

Constructor Details

#initialize(uri, options) ⇒ Connection

Returns a new instance of Connection.


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# File 'lib/httpx/connection.rb', line 52

def initialize(uri, options)
  @current_session = @current_selector = @sibling = @coalesced_connection = nil
  @exhausted = @cloned = @main_sibling = false

  @options = Options.new(options)
  @type = initialize_type(uri, @options)
  @origins = [uri.origin]
  @origin = Utils.to_uri(uri.origin)
  @window_size = @options.window_size
  @read_buffer = Buffer.new(@options.buffer_size)
  @write_buffer = Buffer.new(@options.buffer_size)
  @pending = []

  on(:error, &method(:on_error))
  if @options.io
    # if there's an already open IO, get its
    # peer address, and force-initiate the parser
    transition(:already_open)
    @io = build_socket
    parser
  else
    transition(:idle)
  end
  on(:close) do
    next if @exhausted # it'll reset

    # may be called after ":close" above, so after the connection has been checked back in.
    # next unless @current_session

    next unless @current_session

    @current_session.deselect_connection(self, @current_selector, @cloned)
  end
  on(:terminate) do
    next if @exhausted # it'll reset

    current_session = @current_session
    current_selector = @current_selector

    # may be called after ":close" above, so after the connection has been checked back in.
    next unless current_session && current_selector

    current_session.deselect_connection(self, current_selector)
  end

  on(:altsvc) do |alt_origin, origin, alt_params|
    build_altsvc_connection(alt_origin, origin, alt_params)
  end

  @inflight = 0
  @keep_alive_timeout = @options.timeout[:keep_alive_timeout]

  self.addresses = @options.addresses if @options.addresses
end

Instance Attribute Details

#current_selector=(value) ⇒ Object (writeonly)

Sets the attribute current_selector

Parameters:

  • value —

    the value to set the attribute current_selector to.


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# File 'lib/httpx/connection.rb', line 46

def current_selector=(value)
  @current_selector = value
end

#current_session ⇒ Object

Returns the value of attribute current_session.


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# File 'lib/httpx/connection.rb', line 48

def current_session
  @current_session
end

#family ⇒ Object

Returns the value of attribute family.


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# File 'lib/httpx/connection.rb', line 48

def family
  @family
end

#io ⇒ Object (readonly)

Returns the value of attribute io.


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# File 'lib/httpx/connection.rb', line 44

def io
  @io
end

#options ⇒ Object (readonly)

Returns the value of attribute options.


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# File 'lib/httpx/connection.rb', line 44

def options
  @options
end

#origin ⇒ Object (readonly)

Returns the value of attribute origin.


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# File 'lib/httpx/connection.rb', line 44

def origin
  @origin
end

#origins ⇒ Object (readonly)

Returns the value of attribute origins.


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# File 'lib/httpx/connection.rb', line 44

def origins
  @origins
end

#pending ⇒ Object (readonly)

Returns the value of attribute pending.


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# File 'lib/httpx/connection.rb', line 44

def pending
  @pending
end

#sibling=(connection) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 351

def sibling=(connection)
  @sibling = connection

  return unless connection

  @main_sibling = connection.sibling.nil?

  return unless @main_sibling

  connection.sibling = self
end

#ssl_session ⇒ Object (readonly)

Returns the value of attribute ssl_session.


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# File 'lib/httpx/connection.rb', line 44

def ssl_session
  @ssl_session
end

#state ⇒ Object (readonly)

Returns the value of attribute state.


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# File 'lib/httpx/connection.rb', line 44

def state
  @state
end

#type ⇒ Object (readonly)

Returns the value of attribute type.


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# File 'lib/httpx/connection.rb', line 44

def type
  @type
end

Class Method Details

.parser_type(protocol) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 926

def parser_type(protocol)
  case protocol
  when "h2" then HTTP2
  when "http/1.1" then HTTP1
  else
    raise Error, "unsupported protocol (##{protocol})"
  end
end

Instance Method Details

#addresses ⇒ Object 


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# File 'lib/httpx/connection.rb', line 121

def addresses
  @io && @io.addresses
end

#addresses=(addrs) ⇒ Object

this is a semi-private method, to be used by the resolver to initiate the io object.


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# File 'lib/httpx/connection.rb', line 113

def addresses=(addrs)
  if @io
    @io.add_addresses(addrs)
  else
    @io = build_socket(addrs)
  end
end

#call ⇒ Object 


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# File 'lib/httpx/connection.rb', line 239

def call
  case @state
  when :idle
    connect
    consume
  when :closed
    return
  when :closing
    consume
    transition(:closed)
  when :open
    consume
  end
  nil
rescue StandardError => e
  emit(:error, e)
  raise e
end

#close ⇒ Object 


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# File 'lib/httpx/connection.rb', line 258

def close
  transition(:active) if @state == :inactive

  @parser.close if @parser
end

#coalescable?(connection) ⇒ Boolean

coalescable connections need to be mergeable! but internally, #mergeable? is called before #coalescable?

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 157

def coalescable?(connection)
  if @io.protocol == "h2" &&
     @origin.scheme == "https" &&
     connection.origin.scheme == "https" &&
     @io.can_verify_peer?
    @io.verify_hostname(connection.origin.host)
  else
    @origin == connection.origin
  end
end

#coalesced_connection=(connection) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 344

def coalesced_connection=(connection)
  @coalesced_connection = connection

  close_sibling
  connection.merge(self)
end

#connecting? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 203

def connecting?
  @state == :idle
end

#create_idle(options = {}) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 168

def create_idle(options = {})
  self.class.new(@origin, @options.merge(options))
end

#deactivate ⇒ Object 


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# File 'lib/httpx/connection.rb', line 330

def deactivate
  transition(:inactive)
end

#disconnect ⇒ Object 


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# File 'lib/httpx/connection.rb', line 373

def disconnect
  return unless @current_session && @current_selector

  emit(:close)
  @current_session = nil
  @current_selector = nil
end

#expired? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 138

def expired?
  return false unless @io

  @io.expired?
end

#force_reset(cloned = false) ⇒ Object

bypasses the state machine to force closing of connections still connecting. only used for Happy Eyeballs v2.


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# File 'lib/httpx/connection.rb', line 272

def force_reset(cloned = false)
  @state = :closing
  @cloned = cloned
  transition(:closed)
end

#handle_connect_error(error) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 363

def handle_connect_error(error)
  @connect_error = error

  return handle_error(error) unless @sibling && @sibling.connecting?

  @sibling.merge(self)

  force_reset(true)
end

#handle_socket_timeout(interval) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 338

def handle_socket_timeout(interval)
  error = OperationTimeoutError.new(interval, "timed out while waiting on select")
  error.set_backtrace(caller)
  on_error(error)
end

#idling ⇒ Object 


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# File 'lib/httpx/connection.rb', line 319

def idling
  purge_after_closed
  @write_buffer.clear
  transition(:idle)
  @parser = nil if @parser
end

#inflight? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 207

def inflight?
  @parser && (
    # parser may be dealing with other requests (possibly started from a different fiber)
    !@parser.empty? ||
    # connection may be doing connection termination handshake
    !@write_buffer.empty?
  )
end

#interests ⇒ Object 


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# File 'lib/httpx/connection.rb', line 216

def interests
  # connecting
  if connecting?
    connect

    return @io.interests if connecting?
  end

  # if the write buffer is full, we drain it
  return :w unless @write_buffer.empty?

  return @parser.interests if @parser

  nil
rescue StandardError => e
  emit(:error, e)
  nil
end

#io_connected? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 197

def io_connected?
  return @coalesced_connection.io_connected? if @coalesced_connection

  @io && @io.state == :connected
end

#match?(uri, options) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 125

def match?(uri, options)
  return false if !used? && (@state == :closing || @state == :closed)

  (
    @origins.include?(uri.origin) &&
    # if there is more than one origin to match, it means that this connection
    # was the result of coalescing. To prevent blind trust in the case where the
    # origin came from an ORIGIN frame, we're going to verify the hostname with the
    # SSL certificate
    (@origins.size == 1 || @origin == uri.origin || (@io.is_a?(SSL) && @io.verify_hostname(uri.host)))
  ) && @options == options
end

#merge(connection) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 172

def merge(connection)
  @origins |= connection.instance_variable_get(:@origins)
  if connection.ssl_session
    @ssl_session = connection.ssl_session
    @io.session_new_cb do |sess|
      @ssl_session = sess
    end if @io
  end
  connection.purge_pending do |req|
    send(req)
  end
end

#mergeable?(connection) ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 144

def mergeable?(connection)
  return false if @state == :closing || @state == :closed || !@io

  return false unless connection.addresses

  (
    (open? && @origin == connection.origin) ||
    !(@io.addresses & (connection.addresses || [])).empty?
  ) && @options == connection.options
end

#open? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 334

def open?
  @state == :open || @state == :inactive
end

#peer ⇒ Object 


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# File 'lib/httpx/connection.rb', line 107

def peer
  @origin
end

#purge_pending(&block) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 185

def purge_pending(&block)
  pendings = []
  if @parser
    @inflight -= @parser.pending.size
    pendings << @parser.pending
  end
  pendings << @pending
  pendings.each do |pending|
    pending.reject!(&block)
  end
end

#reset ⇒ Object 


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# File 'lib/httpx/connection.rb', line 278

def reset
  return if @state == :closing || @state == :closed

  transition(:closing)

  transition(:closed)
end

#send(request) ⇒ Object 


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# File 'lib/httpx/connection.rb', line 286

def send(request)
  return @coalesced_connection.send(request) if @coalesced_connection

  if @parser && !@write_buffer.full?
    if @response_received_at && @keep_alive_timeout &&
       Utils.elapsed_time(@response_received_at) > @keep_alive_timeout
      # when pushing a request into an existing connection, we have to check whether there
      # is the possibility that the connection might have extended the keep alive timeout.
      # for such cases, we want to ping for availability before deciding to shovel requests.
      log(level: 3) { "keep alive timeout expired, pinging connection..." }
      @pending << request
      transition(:active) if @state == :inactive
      parser.ping
      request.ping!
      return
    end

    send_request_to_parser(request)
  else
    @pending << request
  end
end

#terminate ⇒ Object 


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# File 'lib/httpx/connection.rb', line 264

def terminate
  @connected_at = nil if @state == :closed

  close
end

#timeout ⇒ Object 


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# File 'lib/httpx/connection.rb', line 309

def timeout
  return if @state == :closed || @state == :inactive

  return @timeout if @timeout

  return @options.timeout[:connect_timeout] if @state == :idle

  @options.timeout[:operation_timeout]
end

#to_io ⇒ Object 


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# File 'lib/httpx/connection.rb', line 235

def to_io
  @io.to_io
end

#used? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/httpx/connection.rb', line 326

def used?
  @connected_at
end