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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 'protocol/http2/stream'
require_relative 'input'
require_relative 'output'
module Async
module HTTP
module Protocol
module HTTP2
class Stream < ::Protocol::HTTP2::Stream
def initialize(*)
super
@headers = nil
# Input buffer, reading request body, or response body (receive_data):
@length = nil
@input = nil
# Output buffer, writing request body or response body (window_updated):
@output = nil
end
attr_accessor :headers
attr :input
def add_header(key, value)
if key == CONNECTION
raise ::Protocol::HTTP2::HeaderError, "Connection header is not allowed!"
elsif key.start_with? ':'
raise ::Protocol::HTTP2::HeaderError, "Invalid pseudo-header #{key}!"
elsif key =~ /[A-Z]/
raise ::Protocol::HTTP2::HeaderError, "Invalid upper-case characters in header #{key}!"
else
@headers.add(key, value)
end
end
def receive_trailing_headers(headers, end_stream)
headers.each do |key, value|
add_header(key, value)
end
end
def process_headers(frame)
if @headers.nil?
@headers = ::Protocol::HTTP::Headers.new
self.receive_initial_headers(super, frame.end_stream?)
elsif frame.end_stream?
self.receive_trailing_headers(super, frame.end_stream?)
else
raise ::Protocol::HTTP2::HeaderError, "Unable to process headers!"
end
# TODO this might need to be in an ensure block:
if @input and frame.end_stream?
@input.close($!)
@input = nil
end
rescue ::Protocol::HTTP2::HeaderError => error
Console.logger.error(self, error)
send_reset_stream(error.code)
end
def wait_for_input
return @input
end
# Prepare the input stream which will be used for incoming data frames.
# @return [Input] the input body.
def prepare_input(length)
if @input.nil?
@input = Input.new(self, length)
else
raise ArgumentError, "Input body already prepared!"
end
end
def update_local_window(frame)
consume_local_window(frame)
# This is done on demand in `Input#read`:
# request_window_update
end
def process_data(frame)
data = frame.unpack
if @input
unless data.empty?
@input.write(data)
end
if frame.end_stream?
@input.close
@input = nil
end
end
return data
rescue ::Protocol::HTTP2::ProtocolError
raise
rescue # Anything else...
send_reset_stream(::Protocol::HTTP2::Error::INTERNAL_ERROR)
end
# Set the body and begin sending it.
def send_body(body, trailer = nil)
@output = Output.new(self, body, trailer)
@output.start
end
# Called when the output terminates normally.
def finish_output(error = nil)
trailer = @output&.trailer
@output = nil
if error
send_reset_stream(::Protocol::HTTP2::Error::INTERNAL_ERROR)
else
# Write trailer?
if trailer&.any?
send_headers(nil, trailer, ::Protocol::HTTP2::END_STREAM)
else
send_data(nil, ::Protocol::HTTP2::END_STREAM)
end
end
end
def window_updated(size)
super
@output&.window_updated(size)
end
# When the stream transitions to the closed state, this method is called. There are roughly two ways this can happen:
# - A frame is received which causes this stream to enter the closed state. This method will be invoked from the background reader task.
# - A frame is sent which causes this stream to enter the closed state. This method will be invoked from that task.
# While the input stream is relatively straight forward, the output stream can trigger the second case above
def closed(error)
super
if @input
@input.close(error)
@input = nil
end
if @output
@output.stop(error)
@output = nil
end
return self
end
end
end
end
end
end
|
