func randomizeTraceID()

in loadgen/eventhandler/handler.go [386:422]

• 33 lines of code
• 16 McCabe index (conditional complexity)

func randomizeTraceID(out *bytes.Buffer, in string, randomBits uint64) bool {
	n := len(in)
	for i := 0; i < n; i++ {
		b := in[i]
		if !((b >= '0' && b <= '9') ||
			(b >= 'a' && b <= 'f') ||
			(b >= 'A' && b <= 'F')) {
			// Not all hex.
			return false
		}
	}

	out.Grow(n)
	for i := 0; i < n; i++ {
		b := in[i]

		var h uint8
		switch {
		case b >= '0' && b <= '9':
			h = b - '0'
		case b >= 'a' && b <= 'f':
			h = 10 + (b - 'a')
		case b >= 'A' && b <= 'F':
			h = 10 + (b - 'A')
		}
		h = (h ^ uint8(randomBits)) & 0x0f
		randomBits = bits.RotateLeft64(randomBits, 4)

		if h < 10 {
			b = '0' + h
		} else {
			b = 'a' + (h - 10)
		}
		out.WriteByte(b)
	}
	return true
}