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This also fixes a subtle bug in header generation when the +$,+
($OFS) variable is defined to something other than nil or ""
I'm really wondering what kind of drugs I was on (or _not_ on)
when I modified some of this from the Mongrel source.
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Rack spec specifies #each must be defined, not #each_pair.
Hash#each_pair was marginally faster in Ruby 1.8, but in Ruby
1.9.1, Hash#each and Hash#each_pair are the same function.
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Tempfile reuse was over-engineered and the problem was not
nearly as big a problem as initially thought.
Additionally, it could lead to a subtle bug in an applications
that link(2)s or rename(2)s the temporary file to a permanent
location _without_ closing it after the request is done.
Applications that suffer from the problem of directory bloat are
still free to modify ENV['TMPDIR'] to influence the creation of
Tempfiles.
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We may have stale UNIX sockets leftover since we don't clean
those up at_exit. So unlink them if we didn't inherit one.
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We'll be using this flag with a pipe, too.
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Along with worker process management. This is nginx-style
inplace upgrading (I don't know of another web server that does
this). Basically we can preserve our opened listen sockets
across entire executable upgrades.
Signals:
USR2 - Sending USR2 to the master unicorn process will cause
it to exec a new master and keep the original workers running.
This is useful to validate that the new code changes took place
are valid and don't immediately die. Once the changes are
validated (manually), you may send QUIT to the original
master process to have it gracefully exit.
HUP - Sending this to the master will make it immediately exec
a new binary and cause the old workers to gracefully exit.
Use this if you're certain the latest changes to Unicorn (and
your app) are ready and don't need validating.
Unlike nginx, re-execing a new binary will pick up any and all
configuration changes. However listener sockets cannot be
removed when exec-ing; only added (for now).
I apologize for making such a big change in one commit, but once
I got the ability to replace the entire codebase while preserving
connections, it was too tempting to continue working.
So I wrote a large chunk of this while hitting
the unicorn-hello-world app with the following loop:
while curl -vSsfN http://0:8080; do date +%N; done
_Zero_ requests lost across multiple restarts.
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Avoid needless userspace copies and craziness. We'll need to
handle EINTR since writes to sockets means stupid things like
this, but it's a small cost...
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Since we handle signals, read(2) syscalls can fail on sockets
with EINTR. Restart the call if we hit this.
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Keeping I/O out of unicorn.rb
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I'll be removing signal handling from worker processes...
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This allows us to avoid the overhead of allocating a new buffer
each and every time we call sysread (even when just parsing
headers for GET requests).
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Unicorn is only designed for fast internal networks (and
loopback); so avoid wasting time with userspace I/O buffering.
This should not significantly affect userspace threading on 1.8
in case your application itself is running threads for some
(masochistic) reason as long as the clients you're serving
directly with Unicorn are fast.
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Instead of ".#{$$}" as the suffix. This makes it clearer that
it's a temporary name and also so we can use per-process sockets
to make debugging easier.
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Keep this somewhat consistent with the HttpParser API
which also exposes #reset instead of #reset!
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Just stuff what little logic we had for it into HttpResponse
since Rack takes care of the rest for us.
Put the HTTP_STATUS_HEADERS hash in HttpResponse since we're the
only user of it. Also, change HttpResponse.send to
HttpResponse.write to avoid overriding the default method.
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Additionally, provide Socket#unicorn_addr which makes it
easy to determine whether a given Socket matches one in
the config.
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We'll be supporting UNIX domain sockets soon... Get rid of
tcphack since it was overriding a default method and just
manually call Socket.new, bind, listen ourselves. Additionaly,
use SO_REUSEADDR when binding since it is convenient for
restarts.
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This will help prevent TMPDIR from becoming bloated when
handling thousands of large uploads a day. This is a problem in
many UNIX filesystems (including ext3): names of entries never
expire even after files are gone and the only way to clear it is
to get rid of the directory itself.
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It's pointless...
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read_body can be a long-running loop; so avoid wasting CPU
cycles by repeatedly performing a hash lookup to get to
a temporary buffer.
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The previous API was very flexible, but I don't think many
people really cared for it... We now repeatedly use the
same HeaderOut in each process since I completely don't
care for multithreading.
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Regenerating headers constantly is a waste of time.
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It's more GC-friendly to just use an array than to repeatedly
append short strings on top of each other. I also find StringIO
confusing...
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All tests for threading and semaphores have been removed. One
test was changed because it depended on a shared variable.
Tests will be replaced with tests to do process management
instead.
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Avoid conflicting with existing Mongrel libraries since
we'll be incompatible and break things w/o disrupting
Mongrel installations.
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