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BUG/MINOR: sample: Make sure to return stable IDs in the unique-id fetch

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Previously when the `unique-id-format` contained non-deterministic parts,
such as the `uuid` fetch each use of the `unique-id` fetch would generate
a new unique ID, replacing the old one. The following configuration shows
the error:

  global
        log stdout format short daemon

  listen test
        log global
        log-format "%ID"
        unique-id-format %{+X}o\ TEST-%[uuid]

        mode http
        bind *:8080
        http-response set-header A %[unique-id]
        http-response set-header B %[unique-id]
        server example example.com:80

Without the patch the contents of the `A` and `B` response header would
differ.

This bug was introduced in commit f4011ddcf5b41284d2b137e84c25f2d1264ce458,
which was first released with HAProxy 1.7-dev3.

This fix should be backported to HAProxy 1.7+.
This commit is contained in:
Tim Duesterhus 2020-02-26 16:20:49 +01:00 committed by Willy Tarreau
parent 55c5399846
commit 530408f976
1 changed files with 3 additions and 3 deletions
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6
src/http_fetch.c
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@ -416,10 +416,10 @@ static int smp_fetch_uniqueid(const struct arg *args, struct sample *smp, const
if ((smp->strm->unique_id = pool_alloc(pool_head_uniqueid)) == NULL)
return 0;
smp->strm->unique_id[0] = '\0';
build_logline(smp->strm, smp->strm->unique_id,
UNIQUEID_LEN, &smp->sess->fe->format_unique_id);
}
smp->data.u.str.data = build_logline(smp->strm, smp->strm->unique_id,
UNIQUEID_LEN, &smp->sess->fe->format_unique_id);
smp->data.u.str.data = strlen(smp->strm->unique_id);
smp->data.type = SMP_T_STR;
smp->data.u.str.area = smp->strm->unique_id;
smp->flags = SMP_F_CONST;