Downside is that this consumes significant disk space, requires
recreating the entire cache when changing something to the way that
pages are rendered and removes flexibility to add dynamic
render-influencing settings in the future.
Alas, crawlers are getting more aggressive and I don't like the idea of
adding more invasive anti-bot tech.
This might not be enough in the long term, we also have a few slow SQL
queries that I'm not yet sure how to optimize. But this ought to give us
more time, at least.
Going from average ~100ms to ~10ms or so. The previous query had a
tendency to be much slower sometimes, let's see if this cache also takes
care of those outliers.
Migration script:
ALTER TABLE packages ADD COLUMN c_hasman boolean NOT NULL DEFAULT FALSE;
DROP INDEX packages_system_name_key;
CREATE UNIQUE INDEX packages_system_name_key ON packages (system, name) INCLUDE (id, c_hasman, dead);
UPDATE packages SET c_hasman = NOT c_hasman
WHERE c_hasman <> EXISTS(SELECT 1 FROM package_versions pv WHERE pv.package = packages.id AND EXISTS(SELECT 1 FROM files f WHERE f.pkgver = pv.id));
Whether or not the package name itself or the (category,name) tuple
uniquely identified a package within a system has been a source of
confusion for a long time. Back in
03d278e4ff I ended up playing playing it
"safe" by going for (category,name), but in practice this doesn't make a
whole lot of sense. While it's *possible* for the same package name to
refer to completely different packages in different "categories", in
reality distributions can't sanely support this anyway.
For distributions where the category referred to a repository, the only
cases where the same package name was used in different repos was when
the package has moved from one repo to another. Those should certainly
not be treated as different packages.
For distributions where the category really referred to a category,
there's the Debian approach where the category is purely a tag and
doesn't help identify the package in any way, and then there's FreeBSD
where the category technically ought to be part of the name. There were
a few cases where FreeBSD used categories to separate out different
versions of the same package (e.g. ipv6 vs non-ipv6), but none were
relevant for man pages so I ended up merging those as well.
Getting rid of the categories simplifies and shortens URLs, unclutters
the UI a little bit and merges the packages in listings that should've
been merged all along.
Migration script:
-- Merge packages that are in multiple categories.
-- All versions are moved to the package with the lowest ID.
-- If the same version already exists in a lower ID, the higher-ID version is deleted.
BEGIN;
WITH migrate(old, new, second) AS (
SELECT q.id, MIN(p.id), MAX(p.id)
FROM packages p
JOIN packages q ON q.id > p.id AND p.system = q.system AND p.name = q.name
GROUP BY q.id
), ded(n) AS (
UPDATE packages SET dead = false
FROM migrate m
JOIN packages q ON q.id = m.old
WHERE packages.id = m.new AND packages.dead AND NOT q.dead
RETURNING 1
), mov(n) AS (
UPDATE package_versions SET package = m.new
FROM migrate m
WHERE package_versions.package = m.old
AND NOT EXISTS(
SELECT 1
FROM package_versions v
WHERE v.package IN(m.new, m.second)
AND v.version = package_versions.version)
RETURNING 1
), del(n) AS (
DELETE FROM packages WHERE id IN(SELECT old FROM migrate)
RETURNING 1
) SELECT (SELECT count(*) FROM migrate) AS migrate,
(SELECT count(*) FROM ded) AS ded,
(SELECT count(*) FROM mov) AS mov,
(SELECT count(*) FROM del) AS del;
ALTER TABLE packages DROP CONSTRAINT packages_system_name_category_key;
CREATE UNIQUE INDEX packages_system_name_key ON packages (system, name);
ALTER TABLE packages DROP COLUMN category;
COMMIT;
Primarily aimed at reducing the size of the old 'man' (now: files)
table, using smaller integers to refer to man contents and text fields,
and storing a shorthash as an integer for quick lookups. This better
normalization also removes the need to keep a separate 'man_index' cache
for the search function.
The old schema wasn't necessarily bad, but I was in the mood for some
optimizations. And a little cleanup.
Prolly introduces a bunch of new bugs, I haven't tested this too well.
