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# frozen_string_literal: true
#
# Copyright, 2019, 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 'async/io/socket'
require 'async/io/stream'
require_relative 'writable'
module Async
module HTTP
module Body
class Pipe
# If the input stream is closed first, it's likely the output stream will also be closed.
def initialize(input, output = Writable.new, task: Task.current)
@input = input
@output = output
head, tail = IO::Socket.pair(Socket::AF_UNIX, Socket::SOCK_STREAM)
@head = IO::Stream.new(head)
@tail = tail
@reader = nil
@writer = nil
task.async(transient: true, &self.method(:reader))
task.async(transient: true, &self.method(:writer))
end
def to_io
@tail
end
def close
@reader&.stop
@writer&.stop
@tail.close
end
private
# Read from the @input stream and write to the head of the pipe.
def reader(task)
@reader = task
task.annotate "#{self.class} reader."
while chunk = @input.read
@head.write(chunk)
@head.flush
end
@head.close_write
ensure
@input.close($!)
close_head if @writer&.finished?
end
# Read from the head of the pipe and write to the @output stream.
# If the @tail is closed, this will cause chunk to be nil, which in turn will call `@output.close` and `@head.close`
def writer(task)
@writer = task
task.annotate "#{self.class} writer."
while chunk = @head.read_partial
@output.write(chunk)
end
ensure
@output.close($!)
close_head if @reader&.finished?
end
def close_head
@head.close
# Both tasks are done, don't keep references:
@reader = nil
@writer = nil
end
end
end
end
end
|
