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package loopdb
import (
"bytes"
"encoding/binary"
"fmt"
"time"
"github.com/coreos/bbolt"
"github.com/lightninglabs/loop/labels"
"github.com/lightningnetwork/lnd/routing/route"
)
// LoopInContract contains the data that is serialized to persistent storage for
// pending loop in swaps.
type LoopInContract struct {
SwapContract
// SweepConfTarget specifies the targeted confirmation target for the
// client sweep tx.
HtlcConfTarget int32
// LastHop is the last hop to use for the loop in swap (optional).
LastHop *route.Vertex
// ExternalHtlc specifies whether the htlc is published by an external
// source.
ExternalHtlc bool
// Label contains an optional label for the swap. Note that this field
// is stored separately to the rest of the contract on disk.
Label string
}
// LoopIn is a combination of the contract and the updates.
type LoopIn struct {
Loop
Contract *LoopInContract
}
// LastUpdateTime returns the last update time of this swap.
func (s *LoopIn) LastUpdateTime() time.Time {
lastUpdate := s.LastUpdate()
if lastUpdate == nil {
return s.Contract.InitiationTime
}
return lastUpdate.Time
}
// serializeLoopInContract serialize the loop in contract into a byte slice.
func serializeLoopInContract(swap *LoopInContract) (
[]byte, error) {
var b bytes.Buffer
if err := binary.Write(&b, byteOrder, swap.InitiationTime.UnixNano()); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.Preimage); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.AmountRequested); err != nil {
return nil, err
}
n, err := b.Write(swap.SenderKey[:])
if err != nil {
return nil, err
}
if n != keyLength {
return nil, fmt.Errorf("sender key has invalid length")
}
n, err = b.Write(swap.ReceiverKey[:])
if err != nil {
return nil, err
}
if n != keyLength {
return nil, fmt.Errorf("receiver key has invalid length")
}
if err := binary.Write(&b, byteOrder, swap.CltvExpiry); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.MaxMinerFee); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.MaxSwapFee); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.InitiationHeight); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.HtlcConfTarget); err != nil {
return nil, err
}
var lastHop route.Vertex
if swap.LastHop != nil {
lastHop = *swap.LastHop
}
if err := binary.Write(&b, byteOrder, lastHop[:]); err != nil {
return nil, err
}
if err := binary.Write(&b, byteOrder, swap.ExternalHtlc); err != nil {
return nil, err
}
return b.Bytes(), nil
}
// putLabel performs validation of a label and writes it to the bucket provided
// under the label key if it is non-zero.
func putLabel(bucket *bbolt.Bucket, label string) error {
if len(label) == 0 {
return nil
}
// Check that the label does not exceed our maximum length.
if len(label) > labels.MaxLength {
return labels.ErrLabelTooLong
}
return bucket.Put(labelKey, []byte(label))
}
// getLabel attempts to get an optional label stored under the label key in a
// bucket. If it is not present, an empty label is returned.
func getLabel(bucket *bbolt.Bucket) string {
label := bucket.Get(labelKey)
if label == nil {
return ""
}
return string(label)
}
// deserializeLoopInContract deserializes the loop in contract from a byte slice.
func deserializeLoopInContract(value []byte) (*LoopInContract, error) {
r := bytes.NewReader(value)
contract := LoopInContract{}
var err error
var unixNano int64
if err := binary.Read(r, byteOrder, &unixNano); err != nil {
return nil, err
}
contract.InitiationTime = time.Unix(0, unixNano)
if err := binary.Read(r, byteOrder, &contract.Preimage); err != nil {
return nil, err
}
err = binary.Read(r, byteOrder, &contract.AmountRequested)
if err != nil {
return nil, err
}
n, err := r.Read(contract.SenderKey[:])
if err != nil {
return nil, err
}
if n != keyLength {
return nil, fmt.Errorf("sender key has invalid length")
}
n, err = r.Read(contract.ReceiverKey[:])
if err != nil {
return nil, err
}
if n != keyLength {
return nil, fmt.Errorf("receiver key has invalid length")
}
if err := binary.Read(r, byteOrder, &contract.CltvExpiry); err != nil {
return nil, err
}
if err := binary.Read(r, byteOrder, &contract.MaxMinerFee); err != nil {
return nil, err
}
if err := binary.Read(r, byteOrder, &contract.MaxSwapFee); err != nil {
return nil, err
}
if err := binary.Read(r, byteOrder, &contract.InitiationHeight); err != nil {
return nil, err
}
if err := binary.Read(r, byteOrder, &contract.HtlcConfTarget); err != nil {
return nil, err
}
var lastHop route.Vertex
if err := binary.Read(r, byteOrder, lastHop[:]); err != nil {
return nil, err
}
var noLastHop route.Vertex
if lastHop != noLastHop {
contract.LastHop = &lastHop
}
if err := binary.Read(r, byteOrder, &contract.ExternalHtlc); err != nil {
return nil, err
}
return &contract, nil
}