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Revision 63020

merge revision(s) 60584,62954-62959,63008:

webrick: support Proc objects as body responses

* lib/webrick/httpresponse.rb (send_body): call send_body_proc
  (send_body_proc): new method
  (class ChunkedWrapper): new class

* test/webrick/test_httpresponse.rb (test_send_body_proc): new test
  (test_send_body_proc_chunked): ditto
  [Feature #855]

webrick: favor .write over << method

This will make the next change to use IO.copy_stream
easier-to-read.  When we can drop Ruby 2.4 support in a few
years, this will allow us to use writev(2) with multiple
arguments for headers and chunked responses.

* lib/webrick/cgi.rb (write): new wrapper method
  lib/webrick/httpresponse.rb: (send_header): use socket.write
  (send_body_io): ditto
  (send_body_string): ditto
  (send_body_proc): ditto
  (_write_data): ditto
  (ChunkedWrapper#write): ditto
  (_send_file): ditto
r62954 | normal | 2018-03-28 17:05:52 +0900 (水, 28 3 2018) | 14 lines

webrick/httpresponse: IO.copy_stream for regular files

Remove the redundant _send_file method since its functionality
is unnecessary with IO.copy_stream.  IO.copy_stream also allows
the use of sendfile under some OSes to speed up copies to
non-TLS sockets.

Testing with "curl >/dev/null" and "ruby -run -e httpd" to
read a 1G file over Linux loopback reveals a reduction from
around ~0.770 to ~0.490 seconds on the client side.

* lib/webrick/httpresponse.rb (send_body_io): use IO.copy_stream
  (_send_file): remove
  [Feature #14237]
r62955 | normal | 2018-03-28 17:05:57 +0900 (水, 28 3 2018) | 10 lines

webrick: use IO.copy_stream for single range response

This is also compatible with range responses generated
by Rack::File (tested with rack 2.0.3).

* lib/webrick/httpresponse.rb (send_body_io): use Content-Range
* lib/webrick/httpservlet/filehandler.rb (make_partial_content):
  use File object for the single range case
* test/webrick/test_filehandler.rb (get_res_body): use send_body
  to test result
r62956 | normal | 2018-03-28 17:06:02 +0900 (水, 28 3 2018) | 7 lines

test/webrick/test_filehandler.rb: stricter multipart range test

We need to ensure we generate compatibile output in
the face of future changes

* test/webrick/test_filehandler.rb (test_make_partial_content):
  check response body
r62957 | normal | 2018-03-28 17:06:08 +0900 (水, 28 3 2018) | 8 lines

webrick: quiet warning for multi-part ranges

Content-Length is ignored by WEBrick::HTTPResponse even if we
calculate it, so instead we chunk responses to HTTP/1.1 clients
and terminate HTTP/1.0 connections.

* lib/webrick/httpservlet/filehandler.rb (make_partial_content):
  quiet warning
r62958 | normal | 2018-03-28 17:06:13 +0900 (水, 28 3 2018) | 7 lines

webrick/httpresponse: make ChunkedWrapper copy_stream-compatible

The .write method needs to return the number of bytes written
to avoid confusing IO.copy_stream.

* lib/webrick/httpresponse.rb (ChunkedWrapper#write): return bytes written
  (ChunkedWrapper#<<): return self
r62959 | normal | 2018-03-28 17:06:18 +0900 (水, 28 3 2018) | 9 lines

webrick: use IO.copy_stream for multipart response

Use the new Proc response body feature to generate a multipart
range response dynamically.  We use a flat array to minimize
object overhead as much as possible; as many ranges may fit
into an HTTP request header.

* lib/webrick/httpservlet/filehandler.rb (multipart_body): new method
  (make_partial_content): use multipart_body

get rid of test error/failure on Windows introduced at r62955

* lib/webrick/httpresponse.rb (send_body_io): use seek if NotImplementedError
  is raised in IO.copy_stream with offset.

* lib/webrick/httpservlet/filehandler.rb (multipart_body): ditto.