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no_chain_backend.go
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/
no_chain_backend.go
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package chainreg
import (
"errors"
"time"
"github.com/brsuite/brond/bronutil"
"github.com/brsuite/brond/chaincfg/chainhash"
"github.com/brsuite/brond/wire"
"github.com/btcsuite/btcwallet/chain"
"github.com/btcsuite/btcwallet/waddrmgr"
"github.com/brolightningnetwork/broln/chainntnfs"
"github.com/brolightningnetwork/broln/channeldb"
"github.com/brolightningnetwork/broln/lnwallet/chainfee"
"github.com/brolightningnetwork/broln/routing/chainview"
)
var (
// defaultFee is the fee that is returned by NoChainBackend.
defaultFee = chainfee.FeePerKwFloor
// noChainBackendName is the backend name returned by NoChainBackend.
noChainBackendName = "nochainbackend"
// errNotImplemented is the error that is returned by NoChainBackend for
// any operation that is not supported by it. Such paths should in
// practice never been hit, so seeing this error either means a remote
// signing instance was used for an unsupported purpose or a previously
// forgotten edge case path was hit.
errNotImplemented = errors.New("not implemented in nochainbackend " +
"mode")
// noChainBackendBestHash is the chain hash of the chain tip that is
// returned by NoChainBackend.
noChainBackendBestHash = &chainhash.Hash{0x01}
// noChainBackendBestHeight is the best height that is returned by
// NoChainBackend.
noChainBackendBestHeight int32 = 1
)
// NoChainBackend is a mock implementation of the following interfaces:
// - chainview.FilteredChainView
// - chainntnfs.ChainNotifier
// - chainfee.Estimator
type NoChainBackend struct {
}
func (n *NoChainBackend) EstimateFeePerKW(uint32) (chainfee.SatPerKWeight,
error) {
return defaultFee, nil
}
func (n *NoChainBackend) RelayFeePerKW() chainfee.SatPerKWeight {
return defaultFee
}
func (n *NoChainBackend) RegisterConfirmationsNtfn(*chainhash.Hash, []byte,
uint32, uint32) (*chainntnfs.ConfirmationEvent, error) {
return nil, errNotImplemented
}
func (n *NoChainBackend) RegisterSpendNtfn(*wire.OutPoint, []byte,
uint32) (*chainntnfs.SpendEvent, error) {
return nil, errNotImplemented
}
func (n *NoChainBackend) RegisterBlockEpochNtfn(
*chainntnfs.BlockEpoch) (*chainntnfs.BlockEpochEvent, error) {
epochChan := make(chan *chainntnfs.BlockEpoch)
return &chainntnfs.BlockEpochEvent{
Epochs: epochChan,
Cancel: func() {
close(epochChan)
},
}, nil
}
func (n *NoChainBackend) Started() bool {
return true
}
func (n *NoChainBackend) FilteredBlocks() <-chan *chainview.FilteredBlock {
return make(chan *chainview.FilteredBlock)
}
func (n *NoChainBackend) DisconnectedBlocks() <-chan *chainview.FilteredBlock {
return make(chan *chainview.FilteredBlock)
}
func (n *NoChainBackend) UpdateFilter([]channeldb.EdgePoint, uint32) error {
return nil
}
func (n *NoChainBackend) FilterBlock(*chainhash.Hash) (*chainview.FilteredBlock,
error) {
return nil, errNotImplemented
}
func (n *NoChainBackend) Start() error {
return nil
}
func (n *NoChainBackend) Stop() error {
return nil
}
var _ chainview.FilteredChainView = (*NoChainBackend)(nil)
var _ chainntnfs.ChainNotifier = (*NoChainBackend)(nil)
var _ chainfee.Estimator = (*NoChainBackend)(nil)
// NoChainSource is a mock implementation of chain.Interface.
// The mock is designed to return static values where necessary to make any
// caller believe the chain is fully synced to virtual block height 1 (hash
// 0x0000..0001). That should avoid calls to other methods completely since they
// are only used for advancing the chain forward.
type NoChainSource struct {
notifChan chan interface{}
BestBlockTime time.Time
}
func (n *NoChainSource) Start() error {
n.notifChan = make(chan interface{})
go func() {
n.notifChan <- &chain.RescanFinished{
Hash: noChainBackendBestHash,
Height: noChainBackendBestHeight,
Time: n.BestBlockTime,
}
}()
return nil
}
func (n *NoChainSource) Stop() {
}
func (n *NoChainSource) WaitForShutdown() {
}
func (n *NoChainSource) GetBestBlock() (*chainhash.Hash, int32, error) {
return noChainBackendBestHash, noChainBackendBestHeight, nil
}
func (n *NoChainSource) GetBlock(*chainhash.Hash) (*wire.MsgBlock, error) {
return &wire.MsgBlock{
Header: wire.BlockHeader{
Timestamp: n.BestBlockTime,
},
Transactions: []*wire.MsgTx{},
}, nil
}
func (n *NoChainSource) GetBlockHash(int64) (*chainhash.Hash, error) {
return noChainBackendBestHash, nil
}
func (n *NoChainSource) GetBlockHeader(*chainhash.Hash) (*wire.BlockHeader,
error) {
return &wire.BlockHeader{
Timestamp: n.BestBlockTime,
}, nil
}
func (n *NoChainSource) IsCurrent() bool {
return true
}
func (n *NoChainSource) FilterBlocks(
*chain.FilterBlocksRequest) (*chain.FilterBlocksResponse, error) {
return nil, errNotImplemented
}
func (n *NoChainSource) BlockStamp() (*waddrmgr.BlockStamp, error) {
return nil, errNotImplemented
}
func (n *NoChainSource) SendRawTransaction(*wire.MsgTx, bool) (*chainhash.Hash,
error) {
return nil, errNotImplemented
}
func (n *NoChainSource) Rescan(*chainhash.Hash, []bronutil.Address,
map[wire.OutPoint]bronutil.Address) error {
return nil
}
func (n *NoChainSource) NotifyReceived([]bronutil.Address) error {
return nil
}
func (n *NoChainSource) NotifyBlocks() error {
return nil
}
func (n *NoChainSource) Notifications() <-chan interface{} {
return n.notifChan
}
func (n *NoChainSource) BackEnd() string {
return noChainBackendName
}
var _ chain.Interface = (*NoChainSource)(nil)