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package writer
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"math/big"
"net/netip"
"github.com/maxmind/mmdbwriter"
"github.com/maxmind/mmdbwriter/mmdbtype"
"go4.org/netipx"
)
// WriteDecoderTestDB writes an mmdb file with all possible record value types.
func (w *Writer) WriteDecoderTestDB() error {
dbWriter, err := mmdbwriter.New(
mmdbwriter.Options{
DatabaseType: "MaxMind DB Decoder Test",
Description: map[string]string{
"en": "MaxMind DB Decoder Test database - contains every MaxMind DB data type",
},
DisableIPv4Aliasing: false,
IncludeReservedNetworks: true,
IPVersion: 6,
Languages: []string{"en"},
RecordSize: 24,
},
)
if err != nil {
return fmt.Errorf("creating mmdbwriter: %w", err)
}
addrs, err := parseIPSlice(ipSample)
if err != nil {
return fmt.Errorf("parsing ip addresses: %w", err)
}
if err := insertAllTypes(dbWriter, addrs); err != nil {
return fmt.Errorf("inserting all types records: %w", err)
}
zeroAddr, err := netip.ParsePrefix("::0.0.0.0/128")
if err != nil {
return fmt.Errorf("parsing ip: %w", err)
}
if err := insertAllTypesZero(dbWriter, []netip.Prefix{zeroAddr}); err != nil {
return fmt.Errorf("inserting all types records: %w", err)
}
maxAddr, err := netip.ParsePrefix("::255.255.255.255/128")
if err != nil {
return fmt.Errorf("parsing ip: %w", err)
}
if err := insertNumericMax(dbWriter, []netip.Prefix{maxAddr}); err != nil {
return fmt.Errorf("inserting all types records: %w", err)
}
if err := w.write(dbWriter, "MaxMind-DB-test-decoder.mmdb"); err != nil {
return fmt.Errorf("writing database: %w", err)
}
return nil
}
// insertAllTypes inserts records with all possible value types.
func insertAllTypes(w *mmdbwriter.Tree, ipAddresses []netip.Prefix) error {
buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.BigEndian, uint32(42)); err != nil {
return fmt.Errorf("creating buffer for all types record: %w", err)
}
ui64 := big.Int{}
ui64.Lsh(big.NewInt(1), 60)
ui128 := big.Int{}
ui128.Lsh(big.NewInt(1), 120)
mmdbUint128 := mmdbtype.Uint128(ui128)
allTypes := mmdbtype.Map{
"array": mmdbtype.Slice{
mmdbtype.Uint32(1),
mmdbtype.Uint32(2),
mmdbtype.Uint32(3),
},
"bytes": mmdbtype.Bytes(buf.Bytes()),
"boolean": mmdbtype.Bool(true),
"double": mmdbtype.Float64(42.123456),
"float": mmdbtype.Float32(1.1),
"int32": mmdbtype.Int32(-1 * math.Pow(2, 28)),
"map": mmdbtype.Map{
"mapX": mmdbtype.Map{
"utf8_stringX": mmdbtype.String("hello"),
"arrayX": mmdbtype.Slice{
mmdbtype.Uint32(7),
mmdbtype.Uint32(8),
mmdbtype.Uint32(9),
},
},
},
"uint16": mmdbtype.Uint16(100),
"uint32": mmdbtype.Uint32(math.Pow(2, 28)),
"uint64": mmdbtype.Uint64(ui64.Uint64()),
"uint128": mmdbUint128.Copy(),
"utf8_string": mmdbtype.String("unicode! ☯ - ♫"),
}
for _, addr := range ipAddresses {
err := w.Insert(
netipx.PrefixIPNet(addr),
allTypes,
)
if err != nil {
return fmt.Errorf("inserting ip: %w", err)
}
}
return nil
}
// insertAllTypesZero inserts records with all possible value types with zero values.
func insertAllTypesZero(w *mmdbwriter.Tree, ipAddresses []netip.Prefix) error {
var uint128 big.Int
mmdbUint128 := mmdbtype.Uint128(uint128)
zeroValues := mmdbtype.Map{
"array": mmdbtype.Slice{},
"bytes": mmdbtype.Bytes([]byte{}),
"boolean": mmdbtype.Bool(false),
"double": mmdbtype.Float64(0),
"float": mmdbtype.Float32(0),
"int32": mmdbtype.Int32(0),
"map": mmdbtype.Map{},
"uint16": mmdbtype.Uint16(0),
"uint32": mmdbtype.Uint32(0),
"uint64": mmdbtype.Uint64(0),
"uint128": mmdbUint128.Copy(),
"utf8_string": mmdbtype.String(""),
}
for _, addr := range ipAddresses {
err := w.Insert(
netipx.PrefixIPNet(addr),
zeroValues,
)
if err != nil {
return fmt.Errorf("inserting ip: %w", err)
}
}
return nil
}
// insertNumericMax inserts records with numeric types maxed out.
func insertNumericMax(w *mmdbwriter.Tree, ipAddresses []netip.Prefix) error {
var uint128Max big.Int
uint128Max.Exp(big.NewInt(2), big.NewInt(128), nil)
uint128Max.Sub(&uint128Max, big.NewInt(1))
mmdbUint128 := mmdbtype.Uint128(uint128Max)
numMax := mmdbtype.Map{
"double": mmdbtype.Float64(math.Inf(1)),
"float": mmdbtype.Float32(float32(math.Inf(1))),
"int32": mmdbtype.Int32(1<<31 - 1),
"uint16": mmdbtype.Uint16(0xffff),
"uint32": mmdbtype.Uint32(0xffffffff),
"uint64": mmdbtype.Uint64(0xffffffffffffffff),
"uint128": mmdbUint128.Copy(),
}
for _, addr := range ipAddresses {
err := w.Insert(
netipx.PrefixIPNet(addr),
numMax,
)
if err != nil {
return fmt.Errorf("inserting ip: %w", err)
}
}
return nil
}
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