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inotify_add_watch(2), open(2), stat(2) may all fail due to
permissions errors, especially when running -nntpd/-imapd
as `nobody' as recommended.
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Anonymous subs cost over 5K each on x86-64. So prefer the
less-recommended-but-still-documented way of using
Linux::Inotify2::watch to register watchers.
This also updates FakeInotify to detect modifications correctly
when used on systems with neither IO::KQueue nor
Linux::Inotify2.
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Since the removal of pseudo-hash support in Perl 5.10, the
"fields" module no longer provides the space or speed benefits
it did in 5.8. It also does not allow for compile-time checks,
only run-time checks.
To me, the extra developer overhead in maintaining "use fields"
args has become a hassle. None of our non-DS-related code uses
fields.pm, nor do any of our current dependencies. In fact,
Danga::Socket (which DS was originally forked from) and its
subclasses are the only fields.pm users I've ever encountered in
the wild. Removing fields may make our code more approachable
to other Perl hackers.
So stop using fields.pm and locked hashes, but continue to
document what fields do for non-trivial classes.
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Since we already use inotify and EVFILT_VNODE (kqueue)
in -imapd, we might as well use them directly in -watch,
too.
This will allow public-inbox-watch to use PublicInbox::DS
for timers to watch newsgroups/mailboxes and have saner
signal handling in future commits.
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We can reduce the amount of platform-specific code by always
relying on IN_MODIFY/NOTE_WRITE notifications from lock release.
This reduces the number of times our read-only daemons will
need to wake up when -watch sees no-op message changes
(e.g. replied, seen, recent flag changes).
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Since IMAP IDLE users aren't expected to issue any commands, we
can terminate their connections immediately on graceful
shutdown.
Furthermore, we need to drop the inotify FD from the epoll set
to avoid warnings during global destruction. Embarassingly,
this required fixing wacky test ordering from 2a717d13f10fcdc6
("nntpd+imapd: detect replaced over.sqlite3")
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Linux::Inotify2 1.x lacked ->on_overflow and ->broadcast
methods. Just don't use them for now. We may eventually
provide a pure Perl alternative which doesn't require closures,
XS, or the common::sense dependency.
Overflowing the inotify queue seems difficult to trigger at
the moment: /proc/sys/fs/inotify/max_queued_events defaults
to 16384 on a my CentOS 7.x VM with 2GB RAM.
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InboxIdle should not be holding onto Inbox objects after the
Config object they came from expires, and Config objects may
expire on SIGHUP.
Old Inbox objects still persist due to IMAP clients holding onto
them, but that's a concern we'll deal with at another time, or
not at all, since all clients expire, eventually.
Regardless, stale inotify watch descriptors should not be left
hanging after SIGHUP refreshes.
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This will be used to implement IMAP IDLE, first.
Eventually, it may be used to trigger other things:
* incremental internal updates for manifest.js.gz
* restart `git cat-file' processes on pack index unlink
* IMAP IDLE-like long-polling HTTP endpoint
And maybe more things we haven't thought of, yet.
It uses Linux::Inotify2 or IO::KQueue depending on what packages
are installed and what the kernel supports. It falls back to
nanosecond-aware Time::HiRes::stat() (available with Perl 5.10.0+)
on systems lacking Linux::Inotify2 and IO::KQueue.
In the future, a pure Perl alternative to Linux::Inotify2 may be
supplied for users of architectures we already support signalfd
and epoll on.
v2 changes:
- avoid O_TRUNC on lock file
- change ctime on Linux systems w/o inotify
- fix naming of comments and fields
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