migration12

Documentation

Index

• Constants
• func MigrateInvoiceTLV(tx kvdb.RwTx) error
• func SerializeInvoice(w io.Writer, i *Invoice) error
• func UseLogger(logger btclog.Logger)
• type ContractState
• type ContractTerm
• type Invoice
  • func LegacyDeserializeInvoice(r io.Reader) (Invoice, error)

Constants

const (
	// MaxMemoSize is maximum size of the memo field within invoices stored
	// in the database.
	MaxMemoSize = 1024

	// MaxPaymentRequestSize is the max size of a payment request for
	// this invoice.
	// TODO(halseth): determine the max length payment request when field
	// lengths are final.
	MaxPaymentRequestSize = 4096
)

Functions

func MigrateInvoiceTLV

func MigrateInvoiceTLV(tx kvdb.RwTx) error

MigrateInvoiceTLV migrates all existing invoice bodies over to be serialized in a single TLV stream. In the process, we drop the Receipt field and add PaymentAddr and Features to the invoice Terms.

func SerializeInvoice

func SerializeInvoice(w io.Writer, i *Invoice) error

SerializeInvoice serializes an invoice to a writer.

nolint: dupl

func UseLogger

func UseLogger(logger btclog.Logger)

UseLogger uses a specified Logger to output package logging info.

Types

type ContractState

type ContractState uint8

ContractState describes the state the invoice is in.

type ContractTerm

type ContractTerm struct {
	// PaymentPreimage is the preimage which is to be revealed in the
	// occasion that an HTLC paying to the hash of this preimage is
	// extended.
	PaymentPreimage lntypes.Preimage

	// Value is the expected amount of milli-satoshis to be paid to an HTLC
	// which can be satisfied by the above preimage.
	Value lnwire.MilliSatoshi

	// State describes the state the invoice is in.
	State ContractState

	// PaymentAddr is a randomly generated value include in the MPP record
	// by the sender to prevent probing of the receiver.
	PaymentAddr [32]byte

	// Features is the feature vectors advertised on the payment request.
	Features *lnwire.FeatureVector
}

ContractTerm is a companion struct to the Invoice struct. This struct houses the necessary conditions required before the invoice can be considered fully settled by the payee.

type Invoice

type Invoice struct {
	// Memo is an optional memo to be stored along side an invoice.  The
	// memo may contain further details pertaining to the invoice itself,
	// or any other message which fits within the size constraints.
	Memo []byte

	// PaymentRequest is an optional field where a payment request created
	// for this invoice can be stored.
	PaymentRequest []byte

	// FinalCltvDelta is the minimum required number of blocks before htlc
	// expiry when the invoice is accepted.
	FinalCltvDelta int32

	// Expiry defines how long after creation this invoice should expire.
	Expiry time.Duration

	// CreationDate is the exact time the invoice was created.
	CreationDate time.Time

	// SettleDate is the exact time the invoice was settled.
	SettleDate time.Time

	// Terms are the contractual payment terms of the invoice. Once all the
	// terms have been satisfied by the payer, then the invoice can be
	// considered fully fulfilled.
	//
	// TODO(roasbeef): later allow for multiple terms to fulfill the final
	// invoice: payment fragmentation, etc.
	Terms ContractTerm

	// AddIndex is an auto-incrementing integer that acts as a
	// monotonically increasing sequence number for all invoices created.
	// Clients can then use this field as a "checkpoint" of sorts when
	// implementing a streaming RPC to notify consumers of instances where
	// an invoice has been added before they re-connected.
	//
	// NOTE: This index starts at 1.
	AddIndex uint64

	// SettleIndex is an auto-incrementing integer that acts as a
	// monotonically increasing sequence number for all settled invoices.
	// Clients can then use this field as a "checkpoint" of sorts when
	// implementing a streaming RPC to notify consumers of instances where
	// an invoice has been settled before they re-connected.
	//
	// NOTE: This index starts at 1.
	SettleIndex uint64

	// AmtPaid is the final amount that we ultimately accepted for pay for
	// this invoice. We specify this value independently as it's possible
	// that the invoice originally didn't specify an amount, or the sender
	// overpaid.
	AmtPaid lnwire.MilliSatoshi

	// Htlcs records all htlcs that paid to this invoice. Some of these
	// htlcs may have been marked as canceled.
	Htlcs []byte
}

Invoice is a payment invoice generated by a payee in order to request payment for some good or service. The inclusion of invoices within Lightning creates a payment work flow for merchants very similar to that of the existing financial system within PayPal, etc. Invoices are added to the database when a payment is requested, then can be settled manually once the payment is received at the upper layer. For record keeping purposes, invoices are never deleted from the database, instead a bit is toggled denoting the invoice has been fully settled. Within the database, all invoices must have a unique payment hash which is generated by taking the sha256 of the payment preimage.

func LegacyDeserializeInvoice

func LegacyDeserializeInvoice(r io.Reader) (Invoice, error)

LegacyDeserializeInvoice decodes an invoice from the passed io.Reader using the pre-TLV serialization.