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MINOR: sample: Add UUID-fetch 

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
View File

@ -14316,6 +14316,11 @@ rand([<range>]) : integer
needed to take some routing decisions for example, or just for debugging
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
Returns an integer value corresponding to the number of currently established
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;
}
// 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: 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
@ -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 },
{ "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_ns_avg", smp_fetch_cpu_ns_avg, 0, NULL, SMP_T_SINT, SMP_USE_INTRN },