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While we've always unlinked dead sockets from nuked/leftover
processes, blindly unlinking them can cause unnecessary failures
when an active process is already listening on them. We now
make a simple connect(2) check to ensure the socket is not in
use before unlinking it.
Thanks to Jordan Ritter for the detailed bug report leading to
this fix.
ref: http://mid.gmane.org/8D95A44B-A098-43BE-B532-7D74BD957F31@darkridge.com
(cherry picked from commit 1a2363b17b1d06be6b35d347ebcaed6a0c940200)
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(cherry picked from commit 98c51edf8b6f031a655a93b52808c9f9b78fb6fa)
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Instead of detecting at startup if filters may be used, just try
anyways and log the error. It is better to ask for forgiveness
than permission :)
(cherry picked from commit 2b4b15cf513f66dc7a5aabaae4491c17895c288c)
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We only use this module in HttpServer and our unit test mocks
it properly.
(cherry picked from commit e0ea1e1548a807d152c0ffc175915e98addfe1f2)
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This is to allow Rainbows! to override the defaults.
(cherry picked from commit ef8f888ba1bacc759156f7336d39ba9b947e3f9d)
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Under Linux, this allows users to tune the time (in seconds) to
defer connections before allowing them to be accepted. The
behavior of TCP_DEFER_ACCEPT changed with Linux 2.6.32 and idle
connections may still be accept()-ed after the specified value
in seconds. A small value of '1' remains the default for
Unicorn as Unicorn does not worry about slow clients. Higher
values provide better DoS protection for Rainbows! but also
increases kernel memory usage.
Allowing "dataready" for FreeBSD accept filters will allow
SSL sockets to be used in the future for HTTPS, too.
(cherry picked from commit 646cc762cc9297510102fc094f3af8a5a9e296c7)
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This is useful as a :listeners argument when setting up
Raindrops::Middleware (http://raindrops.bogomips.org/),
as it can be done automatically.
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Since they're all optional, make them non-fatal, but make sure
we log them so we can diagnose what (if anything) is going
wrong.
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Typically UNIX domain sockets are created with more liberal
file permissions than the rest of the application. By default,
we create UNIX domain sockets to be readable and writable by
all local users to give them the same accessibility as
locally-bound TCP listeners.
This only has an effect on UNIX domain sockets.
This was inspired by Suraj Kurapati in
cfbcd2f00911121536rd0582b8u961f7f2a8c6e546a@mail.gmail.com
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It's compatible with both Ruby 1.8 and 1.9 without
needing a Range object.
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We may add support for the Gopher protocol in the future...
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This ensures any string literals that pop up in *our* code will
just be a bag of bytes. This shouldn't affect/fix/break
existing apps in most cases, but most constants will always have
the "correct" encoding (none!) to be consistent with HTTP/socket
expectations. Since this comment affects things only on a
per-source basis, it won't affect existing apps with the
exception of strings we pass to the Rack application.
This will eventually allow us to get rid of that Unicorn::Z
constant, too.
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Now that we support tunnelling arbitrary protocols over HTTP as
well as "100 Continue" responses, TCP_NODELAY actually becomes
useful to us. TCP_NODELAY is actually reasonably portable
nowadays; even.
While we're adding non-portable options, TCP_CORK/TCP_NOPUSH can
be enabled, too. Unlike some other servers, these can't be
disabled explicitly/intelligently to force a flush, however.
However, these may still improve performance with "normal" HTTP
applications (Mongrel has always had TCP_CORK enabled in Linux).
While we're adding OS-specific features, we might as well
support TCP_DEFER_ACCEPT in Linux and FreeBSD the "httpready"
accept filter to prevent abuse.
These options can all be enabled on a per-listener basis.
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We no longer have anything outside of SocketHelper module in
that file, so just give it a more obvious name.
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