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MINOR: sample: Add UUID-fetch

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Adds the fetch uuid(int). It returns a UUID following the format of
version 4 in the RFC4122 standard.

New feature, but could be backported.
This commit is contained in:
Luca Schimweg 2019-09-10 15:42:52 +02:00 committed by Willy Tarreau
parent e058f7359f
commit 8a694b859c
2 changed files with 60 additions and 0 deletions
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5
doc/configuration.txt
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@ -14316,6 +14316,11 @@ rand([<range>]) : integer
needed to take some routing decisions for example, or just for debugging needed to take some routing decisions for example, or just for debugging
purposes. This random must not be used for security purposes. purposes. This random must not be used for security purposes.
uuid([<version>]) : string
Returns a UUID following the RFC4122 standard. If the version is not
specified, a UUID version 4 (fully random) is returned.
Currently, only version 4 is supported.
srv_conn([<backend>/]<server>) : integer srv_conn([<backend>/]<server>) : integer
Returns an integer value corresponding to the number of currently established Returns an integer value corresponding to the number of currently established
connections on the designated server, possibly including the connection being connections on the designated server, possibly including the connection being

55
src/sample.c
View File

@ -3196,6 +3196,60 @@ static int smp_fetch_const_meth(const struct arg *args, struct sample *smp, cons
return 1; return 1;
} }
// This function checks the "uuid" sample's arguments.
// Function won't get called when no parameter is specified (maybe a bug?)
static int smp_check_uuid(struct arg *args, char **err)
{
if (!args[0].type) {
args[0].type = ARGT_SINT;
args[0].data.sint = 4;
}
else if (args[0].data.sint != 4) {
memprintf(err, "Unsupported UUID version: '%lld'", args[0].data.sint);
return 0;
}
return 1;
}
// Generate a RFC4122 UUID (default is v4 = fully random)
static int smp_fetch_uuid(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (args[0].data.sint == 4 || !args[0].type) {
uint32_t rnd[4] = { 0, 0, 0, 0 };
uint64_t last = 0;
int byte = 0;
uint8_t bits = 0;
unsigned int rand_max_bits = my_flsl(RAND_MAX);
while (byte < 4) {
while (bits < 32) {
last |= (uint64_t)random() << bits;
bits += rand_max_bits;
}
rnd[byte++] = last;
last >>= 32u;
bits -= 32;
}
chunk_printf(&trash, "%8.8x-%4.4x-%4.4x-%4.4x-%12.12llx",
rnd[0],
rnd[1] & 0xFFFF,
((rnd[1] >> 16u) & 0xFFF) | 0x4000, // highest 4 bits indicate the uuid version
(rnd[2] & 0x3FFF) | 0x8000, // the highest 2 bits indicate the UUID variant (10),
(long long)((rnd[2] >> 14u) | ((uint64_t) rnd[3] << 18u)) & 0xFFFFFFFFFFFFull
);
smp->data.type = SMP_T_STR;
smp->flags = SMP_F_VOL_TEST | SMP_F_MAY_CHANGE;
smp->data.u.str = trash;
return 1;
}
// more implementations of other uuid formats possible here
return 0;
}
/* Note: must not be declared <const> as its list will be overwritten. /* Note: must not be declared <const> as its list will be overwritten.
* Note: fetches that may return multiple types must be declared as the lowest * Note: fetches that may return multiple types must be declared as the lowest
* common denominator, the type that can be casted into all other ones. For * common denominator, the type that can be casted into all other ones. For
@ -3214,6 +3268,7 @@ static struct sample_fetch_kw_list smp_kws = {ILH, {
{ "rand", smp_fetch_rand, ARG1(0,SINT), NULL, SMP_T_SINT, SMP_USE_INTRN }, { "rand", smp_fetch_rand, ARG1(0,SINT), NULL, SMP_T_SINT, SMP_USE_INTRN },
{ "stopping", smp_fetch_stopping, 0, NULL, SMP_T_BOOL, SMP_USE_INTRN }, { "stopping", smp_fetch_stopping, 0, NULL, SMP_T_BOOL, SMP_USE_INTRN },
{ "stopping", smp_fetch_stopping, 0, NULL, SMP_T_BOOL, SMP_USE_INTRN }, { "stopping", smp_fetch_stopping, 0, NULL, SMP_T_BOOL, SMP_USE_INTRN },
{ "uuid", smp_fetch_uuid, ARG1(0, SINT), smp_check_uuid, SMP_T_STR, SMP_USE_INTRN },
{ "cpu_calls", smp_fetch_cpu_calls, 0, NULL, SMP_T_SINT, SMP_USE_INTRN }, { "cpu_calls", smp_fetch_cpu_calls, 0, NULL, SMP_T_SINT, SMP_USE_INTRN },
{ "cpu_ns_avg", smp_fetch_cpu_ns_avg, 0, NULL, SMP_T_SINT, SMP_USE_INTRN }, { "cpu_ns_avg", smp_fetch_cpu_ns_avg, 0, NULL, SMP_T_SINT, SMP_USE_INTRN },