Function randomJSONString

pkg/util/json/random.go:111–145

(rng *rand.Rand, cfg randConfig)

const escapeAlphabet = `"\/'bfnrtu`

func randomJSONString(rng *rand.Rand, cfg randConfig) string {
	if cfg.maxLen <= defaultRandStrLen && rng.Intn(2) == 0 {
		return staticStrings[rng.Intn(len(staticStrings))]
	}

	// generate string of this size, biased to produce larger strings.
	l := rng.Intn(cfg.maxLen-cfg.maxLen/4) + cfg.maxLen>>2
	if cfg.escapeProb == 0 {
		return randutil.RandString(rng, l, randutil.PrintableKeyAlphabet)
	}

	result := make([]byte, 0)

	for i := 0; i < l; i++ {
		if rng.Float32() < cfg.escapeProb {
			c := escapeAlphabet[rng.Intn(len(escapeAlphabet))]
			result = append(result, '\\', c)
			i++
			if c == 'u' {
				// Generate random unicode sequence.
				result = append(result, []byte(randutil.RandString(rng, 4, hexAlphabetUpperAndLower))...)
				i += 4
			}
		} else {
			c := byte(rng.Intn(0x7f-0x20) + 0x20)
			if c == '\\' {
				// Retry -- escape handled above.
				i--
				continue
			}
			result = append(result, c)
		}
	}
	return string(result)
}

func randomJSONNumber(rng *rand.Rand) interface{} {
	return json.Number(fmt.Sprintf("%v", rng.ExpFloat64()))