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The use of array-returning built-ins such as `grep' inside
arrayref declarations appears to result in permanently allocated
scratchpad space for caching according to my malloc inspector.
Thread skeletons get discarded every response, but multiple
skeletons can exist in memory at once, so do what we can to
prevent long-lived allocations from being made, here.
In other words, replacing constructs such as:
my $foo = [ grep(...) ];
with:
my @foo = grep(...);
Seems to ensure the mortality of the underlying array.
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Unlike v1 inboxes (which don't accept duplicate Message-IDs at
all), and v2 inboxes (which generate a new Message-ID for
duplicates), extindex must accept duplicate Message-IDs as-is.
This was fine for storage, but prevented the reference-cycle
mechanism of our message threading display algorithm from working
reliably. It could no longer delete the ->{parent} field from
clobbered entries in the %id_table.
So we now take into account reused Message-IDs and never clobber
entries in %id_table. Instead, we mark reused Message-IDs as
"imposters" and special-case them by injecting them as children
after all other threading is complete.
This cycle was noticed using a pre-release of Devel::Mwrap::PSGI:
https://80x24.org/mwrap-perl.git
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We only use it if Mail::Thread is available, and often it's not.
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Using "make update-copyrights" after setting GNULIB_PATH in my
config.mak
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We no longer load or use Email::MIME outside of comparison
tests.
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We can rid ourselves of a layer of indirection by subclassing
PublicInbox::Smsg instead of using a container object to hold
each $smsg. Furthermore, the `{id}' vs. `{mid}' field name
confusion is eliminated.
This reduces the size of the $rootset passed to walk_thread by
around 15%, that is over 50K memory when rendering a /$INBOX/
landing page.
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Since the introduction of over.sqlite3, SearchMsg is not tied to
our search functionality in any way, so stop confusing ourselves
and future hackers by just calling it "PublicInbox::Smsg".
Add a missing "use" in ExtMsg while we're at it.
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I didn't wait until September to do it, this year!
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Improve the display by finding any parent when we see out-of-order
References. This prevents us from having two roots in the test
case like Mail::Thread does.
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In retrospect, the loop prevention done by our indexer is not
always sufficient since it can have an improperly sorted
or incomplete References headers.
This bug was triggered multiple bracketed Message-IDs in an
In-Reply-To: header (not References) where the Message-IDs were
in non-chronological order when somebody tried to reply to
different leafs of a thread with a single message.
So we must check for descendents before blindly trying to
use the last one.
Fixes: c6a8fdf71e2c336f ("thread: last Reference always wins")
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Using update-copyrights from gnulib
While we're at it, use the SPDX identifier for AGPL-3.0+ to
ease mechanical processing.
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This simplifies callers to prevent errors and avoids
needless object-orientation in favor of a single procedure
call to handle threading and ordering.
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We don't actually use anything from SearchMsg,
just the class name.
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Since we use SearchMsg from Xapian data, we can be
assured we do not get self-referential {references}
field.
However, we may need to be more careful when checking
has_descendent for loops, as blindly calling add_child
could open us up to that possibility...
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Some broken (or malicious) mailers may include a generated
Message-ID in its References header, so be prepared for it.
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This starts to show noticeable performance improvements when
attempting to thread over 400 messages; but the improvement
may not be measurable with less.
However, the resulting code is much shorter and (IMHO)
much easier to understand.
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