[ANN] yahns 1.13.0 -_- sleepy app server for Ruby

[ANN] yahns 1.13.0 -_- sleepy app server for Ruby

[Eric Wong]

A Free Software, multi-threaded, non-blocking network
application server designed for low _idle_ power consumption.
It is primarily optimized for applications with occasional users
which see little or no traffic.  yahns currently hosts Rack/HTTP
applications, but may eventually support other application
types.  Unlike some existing servers, yahns is extremely
sensitive to fatal bugs in the applications it hosts.

* git clone git://yhbt.net/yahns
* https://yahns.yhbt.net/README
* https://yahns.yhbt.net/NEWS.atom.xml
* we only accept plain-text email yahns-public@yhbt.net
* and archive all the mail we receive: https://yhbt.net/yahns-public/
* nntp://news.public-inbox.org/inbox.comp.lang.ruby.yahns

lrg nabgure ubeevoyl-anzrq freire :>

Changes:

    yahns 1.13.0 - some user-visible improvements...

    And probably a billion new regressions!

    yahns now allows users to skip the Rack::Head, Rack::Chunked and
    Rack::ContentLength middlewares to ease migrating from/to other
    real-world Rack HTTP servers.  Most notably, our chunked
    encoding implementation is a bit faster than Rack::Chunked by
    taking advantage of the writev(2) syscall:

      https://yhbt.net/yahns-public/20160803031906.14553-4-e@80x24.org/

    There's also rack 2.x fixes in the test case and extras/ section
    (these incompatibilities did not affect existing users unless
    they use the wonky extras/ section).

    There's also some graceful shutdown fixes, the process title is
    now changed to display the number of live FDs.

    Of course, there's the usual round of documentation improvements
    which are systemd and OpenSSL setup-related this time around.

    However, the majority of changes (proxy_*, wbuf_lite), affect
    currently-unadvertised functionality which is subject to removal
    or incompatible config changes.  However, they are used to serve
    our mailing list archives at:

            https://yhbt.net/yahns-public/

    49 changes since yahns 1.12.5:
          proxy_pass: simplify writing request bodies upstream
          proxy_pass: hoist out proxy_res_headers method
          proxy_pass: simplify proxy_http_response
          proxy_pass: split out body and trailer reading in response
          proxy_pass: trim down proxy_response_finish, too
          proxy_pass: split out req_res into a separate file
          proxy_pass: fix resumes after complete buffering is unblocked
          proxy_pass: X-Forwarded-For appends to existing list
          proxy_pass: pass entire object to proxy_http_response
          proxy_pass: support "proxy_buffering: false"
          proxy_pass: remove unnecessary rescue
          req_res: store proxy_pass object here, instead
          proxy_pass: redo "proxy_buffering: false"
          wbuf: remove needless "busy" parameter
          Merge branch 'maint'
          extras/try_gzip_static: do not show backtrace on syscall errors
          wbuf: remove tmpdir parameter
          wbuf_lite: fix write retries for OpenSSL sockets
          test_proxy_pass_no_buffering: fix racy test
          queue_*: check for closed IO objects
          cleanup graceful shutdown handling
          proxy_pass: more descriptive error messages
          proxy_pass: fix HTTP/1.0 backends on EOF w/o buffering
          wbuf_common: reset offset counter when done
          extras/try_gzip_static: resolve symlinks
          test_ssl: remove unnecessary priv_key DH parameter
          openssl_client: wrap shutdown for graceful termination
          proxy_pass: keep trailer buffer on blocked client writes
          proxy_pass: avoid TOCTTOU race when unbuffering, too
          proxy_pass: avoid accessing logger in env after hijacking
          proxy_pass: avoid stuck responses in "proxy_buffering: false"
          extras: include status messages in responses
          update init and add systemd examples
          test_proxy_pass_no_buffering: exclude rb/ru files, too
          wbuf_lite: use StringIO instead of TmpIO
          wbuf_lite: truncate StringIO when done
          wbuf_lite: prevent clobbering responses
          wbuf_lite: unify EOF error handling
          wbuf_lite: reset sf_offset/sf_count consistently
          wbuf_lite: clear @busy flag when re-arming
          http_response: drop bodies for non-compliant responses
          fix rack 2.x compatibility bugs
          doc: add session cache usage to OpenSSL example
          test: skip some buffering tests on non-default values
          response: drop clients after HTTP responses of unknown length
          response: reduce stack overhead for parameter passing
          response: support auto-chunking for HTTP/1.1
          Revert "document Rack::Chunked/ContentLength semi-requirements"
          extras/exec_cgi: fix for HTTPoxy vulnerability

Please note the disclaimer:

  yahns is extremely sensitive to fatal bugs in the apps it hosts.  There
  is no (and never will be) any built-in "watchdog"-type feature to kill
  stuck processes/threads.  Each yahns process may be handling thousands
  of clients; unexpectedly killing the process will abort _all_ of those
  connections.  Lives may be lost!

  yahns hackers are not responsible for your application/library bugs.
  Use an application server which is tolerant of buggy applications
  if you cannot be bothered to fix all your fatal bugs.
-- 
EW