github.com/pmcatominey/terraform@v0.7.0-rc2.0.20160708105029-1401a52a5cc5/helper/acctest/random.go (about) 1 package acctest 2 3 import ( 4 "math/rand" 5 "time" 6 ) 7 8 // Helpers for generating random tidbits for use in identifiers to prevent 9 // collisions in acceptance tests. 10 11 // RandInt generates a random integer 12 func RandInt() int { 13 reseed() 14 return rand.New(rand.NewSource(time.Now().UnixNano())).Int() 15 } 16 17 // RandString generates a random alphanumeric string of the length specified 18 func RandString(strlen int) string { 19 return RandStringFromCharSet(strlen, CharSetAlphaNum) 20 } 21 22 // RandStringFromCharSet generates a random string by selecting characters from 23 // the charset provided 24 func RandStringFromCharSet(strlen int, charSet string) string { 25 reseed() 26 result := make([]byte, strlen) 27 for i := 0; i < strlen; i++ { 28 result[i] = charSet[rand.Intn(len(charSet))] 29 } 30 return string(result) 31 } 32 33 // Seeds random with current timestamp 34 func reseed() { 35 rand.Seed(time.Now().UTC().UnixNano()) 36 } 37 38 const ( 39 // CharSetAlphaNum is the alphanumeric character set for use with 40 // RandStringFromCharSet 41 CharSetAlphaNum = "abcdefghijklmnopqrstuvwxyz012346789" 42 43 // CharSetAlpha is the alphabetical character set for use with 44 // RandStringFromCharSet 45 CharSetAlpha = "abcdefghijklmnopqrstuvwxyz" 46 )