func RandData(r *rand.Rand, n int, useCached bool) []byte {
if useCached && n <= predataLength {
return predata[:n]
}
b := make([]byte, n)
r.Read(b)
ret := make([]byte, n)
for i := range b {
ret[i] = letters[b[i]]
}
return ret
}
// RandDatum generates a random Datum of the given type.
// If null is true, the datum can be DNull.
func RandDatum(rng *rand.Rand, typ ColumnType_Kind, null bool) parser.Datum {
if null && rng.Intn(10) == 0 {
return parser.DNull
}
switch typ {
case ColumnType_BOOL:
return parser.MakeDBool(rng.Intn(2) == 1)
case ColumnType_INT:
return parser.NewDInt(parser.DInt(rng.Int63()))
case ColumnType_FLOAT:
return parser.NewDFloat(parser.DFloat(rng.NormFloat64()))
case ColumnType_DECIMAL:
d := &parser.DDecimal{}
d.Dec.SetScale(inf.Scale(rng.Intn(40) - 20))
d.Dec.SetUnscaled(rng.Int63())
return d
case ColumnType_DATE:
return parser.NewDDate(parser.DDate(rng.Intn(10000)))
case ColumnType_TIMESTAMP:
return &parser.DTimestamp{Time: time.Unix(rng.Int63n(1000000), rng.Int63n(1000000))}
case ColumnType_INTERVAL:
return &parser.DInterval{Duration: duration.Duration{Months: rng.Int63n(1000),
Days: rng.Int63n(1000),
Nanos: rng.Int63n(1000000),
}}
case ColumnType_STRING:
// Generate a random ASCII string.
p := make([]byte, rng.Intn(10))
for i := range p {
p[i] = byte(1 + rng.Intn(127))
}
return parser.NewDString(string(p))
case ColumnType_BYTES:
p := make([]byte, rng.Intn(10))
_, _ = rng.Read(p)
return parser.NewDBytes(parser.DBytes(p))
case ColumnType_TIMESTAMPTZ:
return &parser.DTimestampTZ{Time: time.Unix(rng.Int63n(1000000), rng.Int63n(1000000))}
case ColumnType_INT_ARRAY:
// TODO(cuongdo): we don't support for persistence of arrays yet
return parser.DNull
default:
panic(fmt.Sprintf("invalid type %s", typ))
}
}
// encryptRandom encrypts the input, with 5-10 random bytes added
// before and after it, under a random key. If mode is "ECB", ECB mode
// is used; otherwise CBC mode is used with a random initialization vector.
func encryptRandom(input []byte, mode string, r rand.Rand) []byte {
// start with 5-10 random bytes, then append the input, then 5-10
// more random bytes
s := make([]byte, 5+r.Intn(6))
r.Read(s)
s = append(s, input...)
end := make([]byte, 5+r.Intn(6))
r.Read(end)
s = append(s, end...)
// random key
key := make([]byte, 16)
r.Read(key)
if mode == "ECB" {
return EncryptAes128Ecb(s, key)
}
// CBC mode with random IV
iv := make([]byte, 16)
r.Read(iv)
return EncryptAes128Cbc(s, key, iv)
}
// RandDatum generates a random Datum of the given type.
// If null is true, the datum can be DNull.
func RandDatum(rng *rand.Rand, typ ColumnType, null bool) parser.Datum {
if null && rng.Intn(10) == 0 {
return parser.DNull
}
switch typ.Kind {
case ColumnType_BOOL:
return parser.MakeDBool(rng.Intn(2) == 1)
case ColumnType_INT:
return parser.NewDInt(parser.DInt(rng.Int63()))
case ColumnType_FLOAT:
return parser.NewDFloat(parser.DFloat(rng.NormFloat64()))
case ColumnType_DECIMAL:
d := &parser.DDecimal{}
d.Dec.SetScale(inf.Scale(rng.Intn(40) - 20))
d.Dec.SetUnscaled(rng.Int63())
return d
case ColumnType_DATE:
return parser.NewDDate(parser.DDate(rng.Intn(10000)))
case ColumnType_TIMESTAMP:
return &parser.DTimestamp{Time: time.Unix(rng.Int63n(1000000), rng.Int63n(1000000))}
case ColumnType_INTERVAL:
return &parser.DInterval{Duration: duration.Duration{Months: rng.Int63n(1000),
Days: rng.Int63n(1000),
Nanos: rng.Int63n(1000000),
}}
case ColumnType_STRING:
// Generate a random ASCII string.
p := make([]byte, rng.Intn(10))
for i := range p {
p[i] = byte(1 + rng.Intn(127))
}
return parser.NewDString(string(p))
case ColumnType_BYTES:
p := make([]byte, rng.Intn(10))
_, _ = rng.Read(p)
return parser.NewDBytes(parser.DBytes(p))
case ColumnType_TIMESTAMPTZ:
return &parser.DTimestampTZ{Time: time.Unix(rng.Int63n(1000000), rng.Int63n(1000000))}
case ColumnType_COLLATEDSTRING:
if typ.Locale == nil {
panic("locale is required for COLLATEDSTRING")
}
// Generate a random Unicode string.
var buf bytes.Buffer
n := rng.Intn(10)
for i := 0; i < n; i++ {
var r rune
for {
r = rune(rng.Intn(unicode.MaxRune + 1))
if !unicode.Is(unicode.C, r) {
break
}
}
buf.WriteRune(r)
}
return parser.NewDCollatedString(buf.String(), *typ.Locale, &parser.CollationEnvironment{})
case ColumnType_INT_ARRAY:
// TODO(cuongdo): we don't support for persistence of arrays yet
return parser.DNull
default:
panic(fmt.Sprintf("invalid type %s", typ.String()))
}
}
func randBuf(rng *rand.Rand, maxLen int) []byte {
buf := make([]byte, rng.Intn(maxLen+1))
_, _ = rng.Read(buf)
return buf
}