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Allow archiving via loadable modules.

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Running a shell command for each file to be archived has a lot of
overhead and may not offer as much error checking as you want, or the
exact semantics that you want. So, offer the option to call a loadable
module for each file to be archived, rather than running a shell command.

Also, add a 'basic_archive' contrib module as an example implementation
that archives to a local directory.

Nathan Bossart, with a little bit of kibitzing by me.

Discussion: http://postgr.es/m/20220202224433.GA1036711@nathanxps13
This commit is contained in:
Robert Haas
2022-02-03 13:57:27 -05:00
parent 7c1aead6cb
commit 5ef1eefd76
26 changed files with 941 additions and 67 deletions
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22
contrib/basic_archive/sql/basic_archive.sql Normal file
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CREATE TABLE test (a INT);
SELECT 1 FROM pg_switch_wal();
DO $$
DECLARE
archived bool;
loops int := 0;
BEGIN
LOOP
archived := count(*) > 0 FROM pg_ls_dir('.', false, false) a
WHERE a ~ '^[0-9A-F]{24}$';
IF archived OR loops > 120 * 10 THEN EXIT; END IF;
PERFORM pg_sleep(0.1);
loops := loops + 1;
END LOOP;
END
$$;
SELECT count(*) > 0 FROM pg_ls_dir('.', false, false) a
WHERE a ~ '^[0-9A-F]{24}$';
DROP TABLE test;