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rand: add rand.ulid_at_millisecond/1, use it in rand.ulid/0

pull/5990/head^2
Delyan Angelov 2020-07-26 14:09:49 +03:00
parent 7d52d612ce
commit dfa01d8877
2 changed files with 11 additions and 17 deletions
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10
vlib/rand/rand.v
View File

@ -5,7 +5,6 @@ module rand
import rand.util
import rand.wyrand
import time
// Configuration struct for creating a new instance of the default RNG.
@ -196,10 +195,13 @@ const(
// users or business transactions.
// (https://news.ycombinator.com/item?id=14526173)
pub fn ulid() string {
return ulid_at_millisecond(time.utc().unix_time_milli())
}
pub fn ulid_at_millisecond(unix_time_milli u64) string {
buflen := 26
mut buf := malloc(27)
// time section
mut t := time.utc().unix_time_milli()
mut t := unix_time_milli
mut i := 9
for i >= 0 {
unsafe{
@ -230,5 +232,5 @@ pub fn ulid() string {
unsafe{
buf[26] = 0
}
return string(buf,buflen)
return string(buf, buflen)
}

18
vlib/rand/random_identifiers_test.v
View File

@ -37,21 +37,13 @@ fn test_ulids_max_start_character_is_ok() {
}
fn test_ulids_generated_in_the_same_millisecond_have_the_same_prefix() {
mut t1 := time.utc()
mut t2 := time.utc()
t := time.utc().unix_time_milli()
mut ulid1 := ''
mut ulid2 := ''
mut ulid3 := ''
for {
t1 = time.utc()
ulid1 = rand.ulid()
ulid2 = rand.ulid()
ulid3 = rand.ulid()
t2 = time.utc()
if t1.unix_time_milli() == t2.unix_time_milli() {
break
}
}
mut ulid3 := ''
ulid1 = rand.ulid_at_millisecond(t)
ulid2 = rand.ulid_at_millisecond(t)
ulid3 = rand.ulid_at_millisecond(t)
ulid1_prefix := ulid1[0..10]
ulid2_prefix := ulid2[0..10]
ulid3_prefix := ulid3[0..10]