Close all the listeners when the arbiter shuts down. By doing so,
workers can close the socket at the beginning of a graceful shut
down thereby informing the operating system that the socket can
be cleaned up. With this change, graceful exits with such workers
will refuse new connections while draining, allowing load balancers
to respond more quickly and avoiding leaving connections dangling
in the listen backlog, unaccepted.
Ref #922
Bytes must be passed to socket.send.
Update tests to ensure an actual socket is used, so that errors like
this can be caught in unit tests in the future.
Move setting of env vars from Arbiter.start to Arbiter.setup so that they are available during application start up when 'preload_app' is used.
Closes#735
"Limits the number of worker processes to 1" hasn't been true since
06a4dc6 (fix one error in gunicorn_paster, global conf was ignored,
2010-06-22), although it was true when the line was added in 3c7d532
(Large refactor of the documentation and website, 2010-05-22).
"changes some error handling that's sent to clients" hasn't been true
since feb86d3 (don't display the traceback in the HTTP response,
2013-09-27).
The only remaining actions that --debug had were disabling --preload
and hiding debug-level config logging. The former seems useless (just
disable --preload directly) and the latter at doesn't seem useful
enough for a new setting (just turn down --log-level). With this
commit, --preload always works and you always get debug-level config
logging.
I left a stub Debug entry in gunicorn.config, which we can leave in
place while folks convert any gunicorn scripts and configurations to
drop --debug. When the time comes, we can just remove that entry. I
also the boolean-config tests to use --preload, since that will still
be around after we remove the dummy Debug entry.
Fixes#700.
