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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 'async/queue'
module Async
module HTTP
module Body
include ::Protocol::HTTP::Body
# A dynamic body which you can write to and read from.
class Writable < Readable
class Closed < StandardError
end
# @param [Integer] length The length of the response body if known.
# @param [Async::Queue] queue Specify a different queue implementation, e.g. `Async::LimitedQueue.new(8)` to enable back-pressure streaming.
def initialize(length = nil, queue: Async::Queue.new)
@queue = queue
@length = length
@count = 0
@finished = false
@closed = false
@error = nil
end
def length
@length
end
# Stop generating output; cause the next call to write to fail with the given error.
def close(error = nil)
unless @closed
@queue.enqueue(nil)
@closed = true
@error = error
end
super
end
def closed?
@closed
end
def ready?
!@queue.empty?
end
# Has the producer called #finish and has the reader consumed the nil token?
def empty?
@finished
end
# Read the next available chunk.
def read
return if @finished
unless chunk = @queue.dequeue
@finished = true
end
return chunk
end
# Write a single chunk to the body. Signal completion by calling `#finish`.
def write(chunk)
# If the reader breaks, the writer will break.
# The inverse of this is less obvious (*)
if @closed
raise(@error || Closed)
end
@count += 1
@queue.enqueue(chunk)
end
alias << write
def inspect
"\#<#{self.class} #{@count} chunks written, #{status}>"
end
private
def status
if @finished
'finished'
elsif @closed
'closing'
else
'waiting'
end
end
end
end
end
end
|
