235 lines
7.3 KiB
Go
235 lines
7.3 KiB
Go
package migration12
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import (
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"bytes"
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"encoding/binary"
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"io"
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"time"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/lntypes"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/tlv"
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)
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const (
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// MaxMemoSize is maximum size of the memo field within invoices stored
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// in the database.
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MaxMemoSize = 1024
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// maxReceiptSize is the maximum size of the payment receipt stored
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// within the database along side incoming/outgoing invoices.
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maxReceiptSize = 1024
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// MaxPaymentRequestSize is the max size of a payment request for
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// this invoice.
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// TODO(halseth): determine the max length payment request when field
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// lengths are final.
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MaxPaymentRequestSize = 4096
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memoType tlv.Type = 0
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payReqType tlv.Type = 1
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createTimeType tlv.Type = 2
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settleTimeType tlv.Type = 3
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addIndexType tlv.Type = 4
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settleIndexType tlv.Type = 5
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preimageType tlv.Type = 6
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valueType tlv.Type = 7
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cltvDeltaType tlv.Type = 8
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expiryType tlv.Type = 9
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paymentAddrType tlv.Type = 10
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featuresType tlv.Type = 11
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invStateType tlv.Type = 12
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amtPaidType tlv.Type = 13
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)
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var (
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// invoiceBucket is the name of the bucket within the database that
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// stores all data related to invoices no matter their final state.
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// Within the invoice bucket, each invoice is keyed by its invoice ID
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// which is a monotonically increasing uint32.
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invoiceBucket = []byte("invoices")
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// Big endian is the preferred byte order, due to cursor scans over
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// integer keys iterating in order.
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byteOrder = binary.BigEndian
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)
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// ContractState describes the state the invoice is in.
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type ContractState uint8
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// ContractTerm is a companion struct to the Invoice struct. This struct houses
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// the necessary conditions required before the invoice can be considered fully
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// settled by the payee.
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type ContractTerm struct {
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// PaymentPreimage is the preimage which is to be revealed in the
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// occasion that an HTLC paying to the hash of this preimage is
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// extended.
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PaymentPreimage lntypes.Preimage
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// Value is the expected amount of milli-satoshis to be paid to an HTLC
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// which can be satisfied by the above preimage.
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Value lnwire.MilliSatoshi
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// State describes the state the invoice is in.
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State ContractState
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}
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// Invoice is a payment invoice generated by a payee in order to request
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// payment for some good or service. The inclusion of invoices within Lightning
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// creates a payment work flow for merchants very similar to that of the
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// existing financial system within PayPal, etc. Invoices are added to the
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// database when a payment is requested, then can be settled manually once the
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// payment is received at the upper layer. For record keeping purposes,
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// invoices are never deleted from the database, instead a bit is toggled
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// denoting the invoice has been fully settled. Within the database, all
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// invoices must have a unique payment hash which is generated by taking the
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// sha256 of the payment preimage.
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type Invoice struct {
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// Memo is an optional memo to be stored along side an invoice. The
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// memo may contain further details pertaining to the invoice itself,
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// or any other message which fits within the size constraints.
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Memo []byte
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// PaymentRequest is an optional field where a payment request created
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// for this invoice can be stored.
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PaymentRequest []byte
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// FinalCltvDelta is the minimum required number of blocks before htlc
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// expiry when the invoice is accepted.
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FinalCltvDelta int32
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// Expiry defines how long after creation this invoice should expire.
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Expiry time.Duration
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// CreationDate is the exact time the invoice was created.
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CreationDate time.Time
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// SettleDate is the exact time the invoice was settled.
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SettleDate time.Time
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// Terms are the contractual payment terms of the invoice. Once all the
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// terms have been satisfied by the payer, then the invoice can be
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// considered fully fulfilled.
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//
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// TODO(roasbeef): later allow for multiple terms to fulfill the final
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// invoice: payment fragmentation, etc.
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Terms ContractTerm
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// AddIndex is an auto-incrementing integer that acts as a
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// monotonically increasing sequence number for all invoices created.
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// Clients can then use this field as a "checkpoint" of sorts when
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// implementing a streaming RPC to notify consumers of instances where
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// an invoice has been added before they re-connected.
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//
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// NOTE: This index starts at 1.
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AddIndex uint64
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// SettleIndex is an auto-incrementing integer that acts as a
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// monotonically increasing sequence number for all settled invoices.
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// Clients can then use this field as a "checkpoint" of sorts when
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// implementing a streaming RPC to notify consumers of instances where
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// an invoice has been settled before they re-connected.
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//
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// NOTE: This index starts at 1.
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SettleIndex uint64
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// AmtPaid is the final amount that we ultimately accepted for pay for
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// this invoice. We specify this value independently as it's possible
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// that the invoice originally didn't specify an amount, or the sender
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// overpaid.
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AmtPaid lnwire.MilliSatoshi
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// Htlcs records all htlcs that paid to this invoice. Some of these
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// htlcs may have been marked as canceled.
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Htlcs []byte
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}
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// LegacyDeserializeInvoice decodes an invoice from the passed io.Reader using
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// the pre-TLV serialization.
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//
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// nolint: dupl
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func LegacyDeserializeInvoice(r io.Reader) (Invoice, error) {
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var err error
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invoice := Invoice{}
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// TODO(roasbeef): use read full everywhere
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invoice.Memo, err = wire.ReadVarBytes(r, 0, MaxMemoSize, "")
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if err != nil {
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return invoice, err
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}
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_, err = wire.ReadVarBytes(r, 0, maxReceiptSize, "")
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if err != nil {
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return invoice, err
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}
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invoice.PaymentRequest, err = wire.ReadVarBytes(r, 0, MaxPaymentRequestSize, "")
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if err != nil {
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return invoice, err
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}
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if err := binary.Read(r, byteOrder, &invoice.FinalCltvDelta); err != nil {
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return invoice, err
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}
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var expiry int64
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if err := binary.Read(r, byteOrder, &expiry); err != nil {
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return invoice, err
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}
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invoice.Expiry = time.Duration(expiry)
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birthBytes, err := wire.ReadVarBytes(r, 0, 300, "birth")
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if err != nil {
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return invoice, err
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}
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if err := invoice.CreationDate.UnmarshalBinary(birthBytes); err != nil {
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return invoice, err
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}
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settledBytes, err := wire.ReadVarBytes(r, 0, 300, "settled")
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if err != nil {
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return invoice, err
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}
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if err := invoice.SettleDate.UnmarshalBinary(settledBytes); err != nil {
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return invoice, err
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}
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if _, err := io.ReadFull(r, invoice.Terms.PaymentPreimage[:]); err != nil {
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return invoice, err
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}
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var scratch [8]byte
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if _, err := io.ReadFull(r, scratch[:]); err != nil {
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return invoice, err
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}
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invoice.Terms.Value = lnwire.MilliSatoshi(byteOrder.Uint64(scratch[:]))
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if err := binary.Read(r, byteOrder, &invoice.Terms.State); err != nil {
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return invoice, err
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}
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if err := binary.Read(r, byteOrder, &invoice.AddIndex); err != nil {
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return invoice, err
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}
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if err := binary.Read(r, byteOrder, &invoice.SettleIndex); err != nil {
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return invoice, err
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}
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if err := binary.Read(r, byteOrder, &invoice.AmtPaid); err != nil {
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return invoice, err
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}
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invoice.Htlcs, err = deserializeHtlcs(r)
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if err != nil {
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return Invoice{}, err
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}
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return invoice, nil
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}
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// deserializeHtlcs reads a list of invoice htlcs from a reader and returns it
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// as a flattened byte slice.
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func deserializeHtlcs(r io.Reader) ([]byte, error) {
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var b bytes.Buffer
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_, err := io.Copy(&b, r)
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return b.Bytes(), err
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}
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