package invoicesrpc

import (
	"github.com/lightningnetwork/lnd/graph/db/models"
)

// GraphSource defines the graph interface required by the invoice rpc server.
type GraphSource interface {
	// FetchChannelEdgesByID attempts to look up the two directed edges for
	// the channel identified by the channel ID. If the channel can't be
	// found, then graphdb.ErrEdgeNotFound is returned.
	FetchChannelEdgesByID(chanID uint64) (*models.ChannelEdgeInfo,
		*models.ChannelEdgePolicy, *models.ChannelEdgePolicy, error)

	// IsPublicNode is a helper method that determines whether the node with
	// the given public key is seen as a public node in the graph from the
	// graph's source node's point of view.
	IsPublicNode(pubKey [33]byte) (bool, error)
}