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|
# frozen_string_literal: true
#
# Copyright, 2018, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require_relative 'stream'
require 'async/semaphore'
module Async
module HTTP
module Protocol
module HTTP2
HTTPS = 'https'.freeze
SCHEME = ':scheme'.freeze
METHOD = ':method'.freeze
PATH = ':path'.freeze
AUTHORITY = ':authority'.freeze
STATUS = ':status'.freeze
PROTOCOL = ':protocol'.freeze
CONTENT_LENGTH = 'content-length'.freeze
CONNECTION = 'connection'.freeze
TRAILER = 'trailer'.freeze
module Connection
def initialize(*)
super
@count = 0
@reader = nil
# Writing multiple frames at the same time can cause odd problems if frames are only partially written. So we use a semaphore to ensure frames are written in their entirety.
@write_frame_guard = Async::Semaphore.new(1)
end
def to_s
"\#<#{self.class} #{@streams.count} active streams>"
end
attr :stream
def http1?
false
end
def http2?
true
end
def start_connection
@reader || read_in_background
end
def close(error = nil)
@reader = nil
super
end
def write_frame(frame)
# We don't want to write multiple frames at the same time.
@write_frame_guard.acquire do
super
end
@stream.flush
end
def write_frames(&block)
@write_frame_guard.acquire do
super
end
@stream.flush
end
def read_in_background(parent: Task.current)
raise RuntimeError, "Connection is closed!" if closed?
parent.async(transient: true) do |task|
@reader = task
task.annotate("#{version} reading data for #{self.class}.")
begin
while !self.closed?
self.consume_window
self.read_frame
end
rescue SocketError, IOError, EOFError, Errno::ECONNRESET, Errno::EPIPE, Async::Wrapper::Cancelled
# Ignore.
rescue ::Protocol::HTTP2::GoawayError => error
# Error is raised if a response is actively reading from the
# connection. The connection is silently closed if GOAWAY is
# received outside the request/response cycle.
if @reader
self.close(error)
end
ensure
# Don't call #close twice.
if @reader
self.close($!)
end
end
end
end
attr :promises
def peer
@stream.io
end
attr :count
def concurrency
self.maximum_concurrent_streams
end
# Can we use this connection to make requests?
def viable?
@stream.connected?
end
def reusable?
!self.closed?
end
def version
VERSION
end
end
end
end
end
end
|
