* [ANN] yahns 1.13.0 -_- sleepy app server for Ruby
@ 2016-08-05 7:44 5% Eric Wong
0 siblings, 0 replies; 3+ results
From: Eric Wong @ 2016-08-05 7:44 UTC (permalink / raw)
To: ruby-talk; +Cc: yahns-public
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
^ permalink raw reply [relevance 5%]
* [PATCH 4/5] proxy_pass: more descriptive error messages
2016-06-07 7:39 6% [PATCH \0/5] another round of proxy-related bugfixes! Eric Wong
@ 2016-06-07 7:39 7% ` Eric Wong
0 siblings, 0 replies; 3+ results
From: Eric Wong @ 2016-06-07 7:39 UTC (permalink / raw)
To: yahns-public
This should make it easier to figure out where certain
errors are coming from and perhaps fix problems with
upstreams, too.
This helped me track down the problem causing public-inbox WWW
component running under Perl v5.20.2 on my Debian jessie system
to break and drop connections going through
Plack::Middleware::Deflater with gzip:
https://public-inbox.org/meta/20160607071401.29325-1-e@80x24.org/
Perl 5.14.2 on Debian wheezy did not detect this problem :x
---
lib/yahns/proxy_http_response.rb | 8 ++++++--
lib/yahns/req_res.rb | 6 ++++--
test/test_proxy_pass.rb | 4 ++--
3 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/lib/yahns/proxy_http_response.rb b/lib/yahns/proxy_http_response.rb
index 8de5b4f..9867da2 100644
--- a/lib/yahns/proxy_http_response.rb
+++ b/lib/yahns/proxy_http_response.rb
@@ -53,6 +53,8 @@ def proxy_err_response(code, req_res, exc)
logger.error('premature upstream EOF')
when Kcar::ParserError
logger.error("upstream response error: #{exc.message}")
+ when String
+ logger.error(exc)
else
Yahns::Log.exception(logger, 'upstream error', exc)
end
@@ -167,7 +169,9 @@ def proxy_read_body(tip, kcar, req_res)
return proxy_unbuffer(wbuf) if Yahns::WbufLite === wbuf
when nil # EOF
# HTTP/1.1 upstream, unexpected premature EOF:
- return proxy_err_response(nil, req_res, nil) if len || chunk
+ msg = "upstream EOF (#{len} bytes left)" if len
+ msg = 'upstream EOF (chunk)' if chunk
+ return proxy_err_response(nil, req_res, msg) if msg
# HTTP/1.0 upstream:
wbuf = proxy_write(wbuf, "0\r\n\r\n".freeze, req_res) if alive
@@ -198,7 +202,7 @@ def proxy_read_trailers(kcar, req_res)
when :wait_readable
return wait_on_upstream(req_res)
when nil # premature EOF
- return proxy_err_response(nil, req_res, nil)
+ return proxy_err_response(nil, req_res, 'upstream EOF (trailers)')
end # no loop here
end
wbuf = proxy_write(wbuf, trailer_out(tlr), req_res)
diff --git a/lib/yahns/req_res.rb b/lib/yahns/req_res.rb
index 9bb8f35..041b908 100644
--- a/lib/yahns/req_res.rb
+++ b/lib/yahns/req_res.rb
@@ -42,7 +42,8 @@ def yahns_step # yahns event loop entry point
# continue looping in middle "case @resbuf" loop
when :wait_readable
return rv # spurious wakeup
- when nil then return c.proxy_err_response(502, self, nil)
+ when nil
+ return c.proxy_err_response(502, self, 'upstream EOF (headers)')
end # NOT looping here
when String # continue reading trickled response headers from upstream
@@ -50,7 +51,8 @@ def yahns_step # yahns event loop entry point
case rv = kgio_tryread(0x2000, buf)
when String then res = req.headers(@hdr, resbuf << rv) and break
when :wait_readable then return rv
- when nil then return c.proxy_err_response(502, self, nil)
+ when nil
+ return c.proxy_err_response(502, self, 'upstream EOF (big headers)')
end while true
@resbuf = false
diff --git a/test/test_proxy_pass.rb b/test/test_proxy_pass.rb
index 5dd8058..4c4b53a 100644
--- a/test/test_proxy_pass.rb
+++ b/test/test_proxy_pass.rb
@@ -485,7 +485,7 @@ def check_truncated_upstream(host, port)
assert_equal exp, res
errs = File.readlines(@err.path).grep(/\bERROR\b/)
assert_equal 1, errs.size
- assert_match(/premature upstream EOF/, errs[0])
+ assert_match(/upstream EOF/, errs[0])
@err.truncate(0)
# truncated headers or no response at all...
@@ -501,7 +501,7 @@ def check_truncated_upstream(host, port)
s.close
errs = File.readlines(@err.path).grep(/\bERROR\b/)
assert_equal 1, errs.size
- assert_match(/premature upstream EOF/, errs[0])
+ assert_match(/upstream EOF/, errs[0])
@err.truncate(0)
end
end
^ permalink raw reply related [relevance 7%]
* [PATCH \0/5] another round of proxy-related bugfixes!
@ 2016-06-07 7:39 6% Eric Wong
2016-06-07 7:39 7% ` [PATCH 4/5] proxy_pass: more descriptive error messages Eric Wong
0 siblings, 1 reply; 3+ results
From: Eric Wong @ 2016-06-07 7:39 UTC (permalink / raw)
To: yahns-public
2/5 and 3/5 are generic fixes which may apply to maint.
And yes, even fixed a bug in the PSGI app I'm proxying
(which hosts are mail archives, and soon our git repo).
The next thing to be smarter about avoiding temporary files
entirely with "proxy_buffering: false". But I'll leave the
currently running code as is for a day or so, first.
Anyways, yahns should be able to handle HTTPS termination
for arbitrarily large responses without touching the FS.
But generating the arbitrarily large responses efficiently
(outside of yahns/Ruby) is still tricky :x
Eric Wong (5):
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
lib/yahns/fdmap.rb | 11 ++-
lib/yahns/proxy_http_response.rb | 17 ++--
lib/yahns/queue_epoll.rb | 1 +
lib/yahns/queue_kqueue.rb | 1 +
lib/yahns/req_res.rb | 6 +-
lib/yahns/server.rb | 3 +-
lib/yahns/server_mp.rb | 2 +-
lib/yahns/wbuf_lite.rb | 7 +-
test/test_proxy_pass.rb | 4 +-
test/test_proxy_pass_no_buffering.rb | 145 +++++++++++++++++++----------------
test/test_server.rb | 35 +++++++++
11 files changed, 150 insertions(+), 82 deletions(-)
^ permalink raw reply [relevance 6%]
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2016-06-07 7:39 6% [PATCH \0/5] another round of proxy-related bugfixes! Eric Wong
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2016-08-05 7:44 5% [ANN] yahns 1.13.0 -_- sleepy app server for Ruby Eric Wong
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