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Add gen_random_uuid function

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This adds a built-in function to generate UUIDs.

PostgreSQL hasn't had a built-in function to generate a UUID yet,
relying on external modules such as uuid-ossp and pgcrypto to provide
one.  Now that we have a strong random number generator built-in, we
can easily provide a version 4 (random) UUID generation function.

This patch takes the existing function gen_random_uuid() from pgcrypto
and makes it a built-in function.  The pgcrypto implementation now
internally redirects to the built-in one.

Reviewed-by: Fabien COELHO <coelho@cri.ensmp.fr>
Discussion: https://www.postgresql.org/message-id/6a65610c-46fc-2323-6b78-e8086340a325@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-07-14 14:30:27 +02:00
parent 565f339000
commit 5925e55498
11 changed files with 76 additions and 34 deletions
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20
src/backend/utils/adt/uuid.c
View File

@ -416,3 +416,23 @@ uuid_hash_extended(PG_FUNCTION_ARGS)
return hash_any_extended(key->data, UUID_LEN, PG_GETARG_INT64(1));
}
Datum
gen_random_uuid(PG_FUNCTION_ARGS)
{
pg_uuid_t *uuid = palloc(UUID_LEN);
if (!pg_strong_random(uuid, UUID_LEN))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("could not generate random values")));
/*
* Set magic numbers for a "version 4" (pseudorandom) UUID, see
* http://tools.ietf.org/html/rfc4122#section-4.4
*/
uuid->data[6] = (uuid->data[6] & 0x0f) | 0x40; /* time_hi_and_version */
uuid->data[8] = (uuid->data[8] & 0x3f) | 0x80; /* clock_seq_hi_and_reserved */
PG_RETURN_UUID_P(uuid);
}