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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/stream'
module Async
module HTTP
module Protocol
module HTTP2
class Output
def initialize(stream, body, trailer = nil)
@stream = stream
@body = body
@trailer = trailer
@task = nil
@window_updated = Async::Condition.new
end
attr :trailer
def start(parent: Task.current)
raise "Task already started!" if @task
if @body.stream?
@task = parent.async(&self.method(:stream))
else
@task = parent.async(&self.method(:passthrough))
end
end
def window_updated(size)
@window_updated.signal
end
def write(chunk)
until chunk.empty?
maximum_size = @stream.available_frame_size
while maximum_size <= 0
@window_updated.wait
maximum_size = @stream.available_frame_size
end
break unless chunk = send_data(chunk, maximum_size)
end
end
# This method should only be called from within the context of the output task.
def close(error = nil)
if @stream
@stream.finish_output(error)
@stream = nil
end
end
# This method should only be called from within the context of the HTTP/2 stream.
def stop(error)
@task&.stop
@task = nil
end
private
def stream(task)
task.annotate("Streaming #{@body} to #{@stream}.")
input = @stream.wait_for_input
@body.call(::Protocol::HTTP::Body::Stream.new(input, self))
rescue Async::Stop
# Ignore.
end
# Reads chunks from the given body and writes them to the stream as fast as possible.
def passthrough(task)
task.annotate("Writing #{@body} to #{@stream}.")
while chunk = @body&.read
self.write(chunk)
# TODO this reduces memory usage?
# chunk.clear unless chunk.frozen?
# GC.start
end
self.close
ensure
@body&.close($!)
@body = nil
end
# Send `maximum_size` bytes of data using the specified `stream`. If the buffer has no more chunks, `END_STREAM` will be sent on the final chunk.
# @param maximum_size [Integer] send up to this many bytes of data.
# @param stream [Stream] the stream to use for sending data frames.
# @return [String, nil] any data that could not be written.
def send_data(chunk, maximum_size)
if chunk.bytesize <= maximum_size
@stream.send_data(chunk, maximum_size: maximum_size)
else
@stream.send_data(chunk.byteslice(0, maximum_size), maximum_size: maximum_size)
# The window was not big enough to send all the data, so we save it for next time:
return chunk.byteslice(maximum_size, chunk.bytesize - maximum_size)
end
return nil
end
end
end
end
end
end
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