lnd.xprv/channeldb/codec.go

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package channeldb
import (
"encoding/binary"
"fmt"
"io"
"net"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
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"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/shachain"
)
// outPointSize is the size of a serialized outpoint on disk.
const outPointSize = 36
// writeOutpoint writes an outpoint to the passed writer using the minimal
// amount of bytes possible.
func writeOutpoint(w io.Writer, o *wire.OutPoint) error {
if _, err := w.Write(o.Hash[:]); err != nil {
return err
}
if err := binary.Write(w, byteOrder, o.Index); err != nil {
return err
}
return nil
}
// readOutpoint reads an outpoint from the passed reader that was previously
// written using the writeOutpoint struct.
func readOutpoint(r io.Reader, o *wire.OutPoint) error {
if _, err := io.ReadFull(r, o.Hash[:]); err != nil {
return err
}
if err := binary.Read(r, byteOrder, &o.Index); err != nil {
return err
}
return nil
}
// UnknownElementType is an error returned when the codec is unable to encode or
// decode a particular type.
type UnknownElementType struct {
method string
element interface{}
}
// NewUnknownElementType creates a new UnknownElementType error from the passed
// method name and element.
func NewUnknownElementType(method string, el interface{}) UnknownElementType {
return UnknownElementType{method: method, element: el}
}
// Error returns the name of the method that encountered the error, as well as
// the type that was unsupported.
func (e UnknownElementType) Error() string {
return fmt.Sprintf("Unknown type in %s: %T", e.method, e.element)
}
// WriteElement is a one-stop shop to write the big endian representation of
// any element which is to be serialized for storage on disk. The passed
// io.Writer should be backed by an appropriately sized byte slice, or be able
// to dynamically expand to accommodate additional data.
func WriteElement(w io.Writer, element interface{}) error {
switch e := element.(type) {
case keychain.KeyDescriptor:
if err := binary.Write(w, byteOrder, e.Family); err != nil {
return err
}
if err := binary.Write(w, byteOrder, e.Index); err != nil {
return err
}
if e.PubKey != nil {
if err := binary.Write(w, byteOrder, true); err != nil {
}
return WriteElement(w, e.PubKey)
}
return binary.Write(w, byteOrder, false)
case ChannelType:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case chainhash.Hash:
if _, err := w.Write(e[:]); err != nil {
return err
}
case wire.OutPoint:
return writeOutpoint(w, &e)
case lnwire.ShortChannelID:
if err := binary.Write(w, byteOrder, e.ToUint64()); err != nil {
return err
}
case lnwire.ChannelID:
if _, err := w.Write(e[:]); err != nil {
return err
}
case uint64:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case uint32:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case int32:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case uint16:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case uint8:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case bool:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case btcutil.Amount:
if err := binary.Write(w, byteOrder, uint64(e)); err != nil {
return err
}
case lnwire.MilliSatoshi:
if err := binary.Write(w, byteOrder, uint64(e)); err != nil {
return err
}
case *btcec.PublicKey:
b := e.SerializeCompressed()
if _, err := w.Write(b); err != nil {
return err
}
case shachain.Producer:
return e.Encode(w)
case shachain.Store:
return e.Encode(w)
case *wire.MsgTx:
return e.Serialize(w)
case [32]byte:
if _, err := w.Write(e[:]); err != nil {
return err
}
case []byte:
if err := wire.WriteVarBytes(w, 0, e); err != nil {
return err
}
case lnwire.Message:
if _, err := lnwire.WriteMessage(w, e, 0); err != nil {
return err
}
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case ChannelStatus:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case ClosureType:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
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case lnwire.FundingFlag:
if err := binary.Write(w, byteOrder, e); err != nil {
return err
}
case net.Addr:
if err := serializeAddr(w, e); err != nil {
return err
}
case []net.Addr:
if err := WriteElement(w, uint32(len(e))); err != nil {
return err
}
for _, addr := range e {
if err := serializeAddr(w, addr); err != nil {
return err
}
}
default:
return UnknownElementType{"WriteElement", e}
}
return nil
}
// WriteElements is writes each element in the elements slice to the passed
// io.Writer using WriteElement.
func WriteElements(w io.Writer, elements ...interface{}) error {
for _, element := range elements {
err := WriteElement(w, element)
if err != nil {
return err
}
}
return nil
}
// ReadElement is a one-stop utility function to deserialize any datastructure
// encoded using the serialization format of the database.
func ReadElement(r io.Reader, element interface{}) error {
switch e := element.(type) {
case *keychain.KeyDescriptor:
if err := binary.Read(r, byteOrder, &e.Family); err != nil {
return err
}
if err := binary.Read(r, byteOrder, &e.Index); err != nil {
return err
}
var hasPubKey bool
if err := binary.Read(r, byteOrder, &hasPubKey); err != nil {
return err
}
if hasPubKey {
return ReadElement(r, &e.PubKey)
}
case *ChannelType:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *chainhash.Hash:
if _, err := io.ReadFull(r, e[:]); err != nil {
return err
}
case *wire.OutPoint:
return readOutpoint(r, e)
case *lnwire.ShortChannelID:
var a uint64
if err := binary.Read(r, byteOrder, &a); err != nil {
return err
}
*e = lnwire.NewShortChanIDFromInt(a)
case *lnwire.ChannelID:
if _, err := io.ReadFull(r, e[:]); err != nil {
return err
}
case *uint64:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *uint32:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *int32:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *uint16:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *uint8:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *bool:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *btcutil.Amount:
var a uint64
if err := binary.Read(r, byteOrder, &a); err != nil {
return err
}
*e = btcutil.Amount(a)
case *lnwire.MilliSatoshi:
var a uint64
if err := binary.Read(r, byteOrder, &a); err != nil {
return err
}
*e = lnwire.MilliSatoshi(a)
case **btcec.PublicKey:
var b [btcec.PubKeyBytesLenCompressed]byte
if _, err := io.ReadFull(r, b[:]); err != nil {
return err
}
pubKey, err := btcec.ParsePubKey(b[:], btcec.S256())
if err != nil {
return err
}
*e = pubKey
case *shachain.Producer:
var root [32]byte
if _, err := io.ReadFull(r, root[:]); err != nil {
return err
}
// TODO(roasbeef): remove
producer, err := shachain.NewRevocationProducerFromBytes(root[:])
if err != nil {
return err
}
*e = producer
case *shachain.Store:
store, err := shachain.NewRevocationStoreFromBytes(r)
if err != nil {
return err
}
*e = store
case **wire.MsgTx:
tx := wire.NewMsgTx(2)
if err := tx.Deserialize(r); err != nil {
return err
}
*e = tx
case *[32]byte:
if _, err := io.ReadFull(r, e[:]); err != nil {
return err
}
case *[]byte:
bytes, err := wire.ReadVarBytes(r, 0, 66000, "[]byte")
if err != nil {
return err
}
*e = bytes
case *lnwire.Message:
msg, err := lnwire.ReadMessage(r, 0)
if err != nil {
return err
}
*e = msg
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case *ChannelStatus:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *ClosureType:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
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case *lnwire.FundingFlag:
if err := binary.Read(r, byteOrder, e); err != nil {
return err
}
case *net.Addr:
addr, err := deserializeAddr(r)
if err != nil {
return err
}
*e = addr
case *[]net.Addr:
var numAddrs uint32
if err := ReadElement(r, &numAddrs); err != nil {
return err
}
*e = make([]net.Addr, numAddrs)
for i := uint32(0); i < numAddrs; i++ {
addr, err := deserializeAddr(r)
if err != nil {
return err
}
(*e)[i] = addr
}
default:
return UnknownElementType{"ReadElement", e}
}
return nil
}
// ReadElements deserializes a variable number of elements into the passed
// io.Reader, with each element being deserialized according to the ReadElement
// function.
func ReadElements(r io.Reader, elements ...interface{}) error {
for _, element := range elements {
err := ReadElement(r, element)
if err != nil {
return err
}
}
return nil
}