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"LIKE" in SQLite (and other SQL implementations I've seen) is
expensive with nearly 3 million messages in the archives.
This caused some partial Message-ID lookups to take over 600ms
on my workstation (~300ms on a faster Xeon). Cut that to below
under 30ms on average on my workstation by relying exclusively
on Xapian for partial Message-ID lookups as we have in the past.
Unlike in the past when we tried using Xapian to match partial
Message-IDs; we now optimize our indexing of Message-IDs to
break apart "words" in Message-IDs for searching, yielding
(hopefully) "good enough" accuracy for folks who get long URLs
broken across lines when copy+pasting.
We'll also drop the (in retrospect) pointless stripping of
"/[tTf]" suffixes for the partial match, since anybody who
hits that codepath would be hitting an invalid message ID.
Finally, limit wildcard expansion to prevent easy DoS vectors
on short terms.
And blame Pine and alpine for generating Message-IDs with
low-entropy prefixes :P
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This will be used to keep track of Message-ID <-> NNTP Article
numbers to prevent article number reuse when reindexing.
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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 will allow smoother imports as occasional Message-ID
duplicates happen and the best we can do is ignore the
second one.
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This should make identifiying leftover directories
due to SIGKILL-ed tests easier.
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We should be able to run tests on bare bones systems more easily.
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Implementing NEWNEWS, XHDR, XOVER efficiently will require
additional caching on top of msgmap.
This seems to work with lynx and slrnpull, haven't tried clients.
DO NOT run in production, yet, denial-of-service vulnerabilities
await!
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This will allow us to maintain stable article numbers for an
NNTP server independently of Xapian.
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