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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/http/body/readable'
require 'protocol/http/body/stream'
require_relative 'writable'
module Async
module HTTP
module Body
# A body which is designed for hijacked server responses - a response which uses a block to read and write the request and response bodies respectively.
class Hijack < ::Protocol::HTTP::Body::Readable
def self.response(request, status, headers, &block)
::Protocol::HTTP::Response[status, headers, self.wrap(request, &block)]
end
def self.wrap(request = nil, &block)
self.new(block, request&.body)
end
def initialize(block, input = nil)
@block = block
@input = input
@task = nil
@stream = nil
@output = nil
end
# We prefer streaming directly as it's the lowest overhead.
def stream?
true
end
def call(stream)
return @block.call(stream)
end
attr :input
# Has the producer called #finish and has the reader consumed the nil token?
def empty?
@output&.empty?
end
def ready?
@output&.ready?
end
# Read the next available chunk.
def read
unless @output
@output = Writable.new
@stream = ::Protocol::HTTP::Body::Stream.new(@input, @output)
@task = Task.current.async do |task|
task.annotate "Streaming hijacked body."
@block.call(@stream)
end
end
return @output.read
end
def inspect
"\#<#{self.class} #{@block.inspect}>"
end
def to_s
"<Hijack #{@block.class}>"
end
end
end
end
end
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