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db.go
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db.go
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package channeldb
import (
"bytes"
"encoding/binary"
"fmt"
"io/ioutil"
"net"
"os"
"github.com/decred/dcrd/dcrec/secp256k1/v4"
"github.com/decred/dcrd/wire"
mig "github.com/decred/dcrlnd/channeldb/migration"
"github.com/decred/dcrlnd/channeldb/migration12"
"github.com/decred/dcrlnd/channeldb/migration13"
"github.com/decred/dcrlnd/channeldb/migration16"
"github.com/decred/dcrlnd/channeldb/migration20"
"github.com/decred/dcrlnd/channeldb/migration21"
"github.com/decred/dcrlnd/channeldb/migration23"
"github.com/decred/dcrlnd/channeldb/migration24"
"github.com/decred/dcrlnd/channeldb/migration_01_to_11"
"github.com/decred/dcrlnd/clock"
"github.com/decred/dcrlnd/kvdb"
"github.com/decred/dcrlnd/lnwire"
"github.com/decred/dcrlnd/routing/route"
"github.com/go-errors/errors"
)
const (
dbName = "channel.db"
)
var (
// ErrDryRunMigrationOK signals that a migration executed successful,
// but we intentionally did not commit the result.
ErrDryRunMigrationOK = errors.New("dry run migration successful")
)
// migration is a function which takes a prior outdated version of the database
// instances and mutates the key/bucket structure to arrive at a more
// up-to-date version of the database.
type migration func(tx kvdb.RwTx) error
type version struct {
number uint32
migration migration
}
var (
// dbVersions is storing all versions of database. If current version
// of database don't match with latest version this list will be used
// for retrieving all migration function that are need to apply to the
// current db.
dbVersions = []version{
{
// The base DB version requires no migration.
number: 0,
migration: nil,
},
{
// The version of the database where two new indexes
// for the update time of node and channel updates were
// added.
number: 1,
migration: migration_01_to_11.MigrateNodeAndEdgeUpdateIndex,
},
{
// The DB version that added the invoice event time
// series.
number: 2,
migration: migration_01_to_11.MigrateInvoiceTimeSeries,
},
{
// The DB version that updated the embedded invoice in
// outgoing payments to match the new format.
number: 3,
migration: migration_01_to_11.MigrateInvoiceTimeSeriesOutgoingPayments,
},
{
// The version of the database where every channel
// always has two entries in the edges bucket. If
// a policy is unknown, this will be represented
// by a special byte sequence.
number: 4,
migration: migration_01_to_11.MigrateEdgePolicies,
},
{
// The DB version where we persist each attempt to send
// an HTLC to a payment hash, and track whether the
// payment is in-flight, succeeded, or failed.
number: 5,
migration: migration_01_to_11.PaymentStatusesMigration,
},
{
// The DB version that properly prunes stale entries
// from the edge update index.
number: 6,
migration: migration_01_to_11.MigratePruneEdgeUpdateIndex,
},
{
// The DB version that migrates the ChannelCloseSummary
// to a format where optional fields are indicated with
// boolean flags.
number: 7,
migration: migration_01_to_11.MigrateOptionalChannelCloseSummaryFields,
},
{
// The DB version that changes the gossiper's message
// store keys to account for the message's type and
// ShortChannelID.
number: 8,
migration: migration_01_to_11.MigrateGossipMessageStoreKeys,
},
{
// The DB version where the payments and payment
// statuses are moved to being stored in a combined
// bucket.
number: 9,
migration: migration_01_to_11.MigrateOutgoingPayments,
},
{
// The DB version where we started to store legacy
// payload information for all routes, as well as the
// optional TLV records.
number: 10,
migration: migration_01_to_11.MigrateRouteSerialization,
},
{
// Add invoice htlc and cltv delta fields.
number: 11,
migration: migration_01_to_11.MigrateInvoices,
},
{
// Migrate to TLV invoice bodies, add payment address
// and features, remove receipt.
number: 12,
migration: migration12.MigrateInvoiceTLV,
},
{
// Migrate to multi-path payments.
number: 13,
migration: migration13.MigrateMPP,
},
{
// Initialize payment address index and begin using it
// as the default index, falling back to payment hash
// index.
number: 14,
migration: mig.CreateTLB(payAddrIndexBucket),
},
{
// Initialize payment index bucket which will be used
// to index payments by sequence number. This index will
// be used to allow more efficient ListPayments queries.
number: 15,
migration: mig.CreateTLB(paymentsIndexBucket),
},
{
// Add our existing payments to the index bucket created
// in migration 15.
number: 16,
migration: migration16.MigrateSequenceIndex,
},
{
// Create a top level bucket which will store extra
// information about channel closes.
number: 17,
migration: mig.CreateTLB(closeSummaryBucket),
},
{
// Create a top level bucket which holds information
// about our peers.
number: 18,
migration: mig.CreateTLB(peersBucket),
},
{
// Create a top level bucket which holds outpoint
// information.
number: 19,
migration: mig.CreateTLB(outpointBucket),
},
{
// Migrate some data to the outpoint index.
number: 20,
migration: migration20.MigrateOutpointIndex,
},
{
// Migrate to length prefixed wire messages everywhere
// in the database.
number: 21,
migration: migration21.MigrateDatabaseWireMessages,
},
{
// Initialize set id index so that invoices can be
// queried by individual htlc sets.
number: 22,
migration: mig.CreateTLB(setIDIndexBucket),
},
{
number: 23,
migration: migration23.MigrateHtlcAttempts,
},
{
// Remove old forwarding packages of closed channels.
number: 24,
migration: migration24.MigrateFwdPkgCleanup,
},
// Note: There are decred-only changes in the codec which may
// require porting when bringing upstream migrations from lnd.
// In particular:
// - {read,write}Outpoint include the tree.
}
// Big endian is the preferred byte order, due to cursor scans over
// integer keys iterating in order.
byteOrder = binary.BigEndian
// channelOpeningStateBucket is the database bucket used to store the
// channelOpeningState for each channel that is currently in the process
// of being opened.
channelOpeningStateBucket = []byte("channelOpeningState")
)
// DB is the primary datastore for the lnd daemon. The database stores
// information related to nodes, routing data, open/closed channels, fee
// schedules, and reputation data.
type DB struct {
kvdb.Backend
// channelStateDB separates all DB operations on channel state.
channelStateDB *ChannelStateDB
dbPath string
graph *ChannelGraph
clock clock.Clock
dryRun bool
}
// Open opens or creates channeldb. Any necessary schemas migrations due
// to updates will take place as necessary.
// TODO(bhandras): deprecate this function.
func Open(dbPath string, modifiers ...OptionModifier) (*DB, error) {
opts := DefaultOptions()
for _, modifier := range modifiers {
modifier(&opts)
}
backend, err := kvdb.GetBoltBackend(&kvdb.BoltBackendConfig{
DBPath: dbPath,
DBFileName: dbName,
NoFreelistSync: opts.NoFreelistSync,
AutoCompact: opts.AutoCompact,
AutoCompactMinAge: opts.AutoCompactMinAge,
DBTimeout: opts.DBTimeout,
})
if err != nil {
return nil, err
}
db, err := CreateWithBackend(backend, modifiers...)
if err == nil {
db.dbPath = dbPath
}
return db, err
}
// CreateWithBackend creates channeldb instance using the passed kvdb.Backend.
// Any necessary schemas migrations due to updates will take place as necessary.
func CreateWithBackend(backend kvdb.Backend, modifiers ...OptionModifier) (*DB, error) {
if err := initChannelDB(backend); err != nil {
return nil, err
}
opts := DefaultOptions()
for _, modifier := range modifiers {
modifier(&opts)
}
chanDB := &DB{
Backend: backend,
channelStateDB: &ChannelStateDB{
linkNodeDB: &LinkNodeDB{
backend: backend,
},
backend: backend,
},
clock: opts.clock,
dryRun: opts.dryRun,
}
// Set the parent pointer (only used in tests).
chanDB.channelStateDB.parent = chanDB
var err error
chanDB.graph, err = NewChannelGraph(
backend, opts.RejectCacheSize, opts.ChannelCacheSize,
opts.BatchCommitInterval, opts.PreAllocCacheNumNodes,
opts.UseGraphCache,
)
if err != nil {
return nil, err
}
// Synchronize the version of database and apply migrations if needed.
if err := chanDB.syncVersions(dbVersions); err != nil {
backend.Close()
return nil, err
}
// Run dcrlnd-specific init code (that hasn't been ported to lnd).
if err := chanDB.initDcrlndFeatures(); err != nil {
backend.Close()
return nil, err
}
return chanDB, nil
}
// Path returns the file path to the channel database.
func (d *DB) Path() string {
return d.dbPath
}
var dbTopLevelBuckets = [][]byte{
openChannelBucket,
closedChannelBucket,
chanReestablishWaitTimeBucket, // DCR only
forwardingLogBucket,
fwdPackagesKey,
invoiceBucket,
payAddrIndexBucket,
setIDIndexBucket,
paymentsIndexBucket,
peersBucket,
nodeInfoBucket,
metaBucket,
closeSummaryBucket,
outpointBucket,
historicalChannelBucket,
}
// Wipe completely deletes all saved state within all used buckets within the
// database. The deletion is done in a single transaction, therefore this
// operation is fully atomic.
func (d *DB) Wipe() error {
err := kvdb.Update(d, func(tx kvdb.RwTx) error {
for _, tlb := range dbTopLevelBuckets {
err := tx.DeleteTopLevelBucket(tlb)
if err != nil && err != kvdb.ErrBucketNotFound {
return err
}
}
return nil
}, func() {})
if err != nil {
return err
}
return initChannelDB(d.Backend)
}
// initChannelDB creates and initializes a fresh version of channeldb. In the
// case that the target path has not yet been created or doesn't yet exist, then
// the path is created. Additionally, all required top-level buckets used within
// the database are created.
func initChannelDB(db kvdb.Backend) error {
err := kvdb.Update(db, func(tx kvdb.RwTx) error {
meta := &Meta{}
// Check if DB is already initialized.
err := fetchMeta(meta, tx)
if err == nil {
return nil
}
for _, tlb := range dbTopLevelBuckets {
if _, err := tx.CreateTopLevelBucket(tlb); err != nil {
return err
}
}
meta.DbVersionNumber = getLatestDBVersion(dbVersions)
return putMeta(meta, tx)
}, func() {})
if err != nil {
return fmt.Errorf("unable to create new channeldb: %v", err)
}
return nil
}
// fileExists returns true if the file exists, and false otherwise.
func fileExists(path string) bool {
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// ChannelStateDB is a database that keeps track of all channel state.
type ChannelStateDB struct {
// linkNodeDB separates all DB operations on LinkNodes.
linkNodeDB *LinkNodeDB
// parent holds a pointer to the "main" channeldb.DB object. This is
// only used for testing and should never be used in production code.
// For testing use the ChannelStateDB.GetParentDB() function to retrieve
// this pointer.
parent *DB
// backend points to the actual backend holding the channel state
// database. This may be a real backend or a cache middleware.
backend kvdb.Backend
}
// GetParentDB returns the "main" channeldb.DB object that is the owner of this
// ChannelStateDB instance. Use this function only in tests where passing around
// pointers makes testing less readable. Never to be used in production code!
func (c *ChannelStateDB) GetParentDB() *DB {
return c.parent
}
// LinkNodeDB returns the current instance of the link node database.
func (c *ChannelStateDB) LinkNodeDB() *LinkNodeDB {
return c.linkNodeDB
}
// FetchOpenChannels starts a new database transaction and returns all stored
// currently active/open channels associated with the target nodeID. In the case
// that no active channels are known to have been created with this node, then a
// zero-length slice is returned.
func (c *ChannelStateDB) FetchOpenChannels(nodeID *secp256k1.PublicKey) (
[]*OpenChannel, error) {
var channels []*OpenChannel
err := kvdb.View(c.backend, func(tx kvdb.RTx) error {
var err error
channels, err = c.fetchOpenChannels(tx, nodeID)
return err
}, func() {
channels = nil
})
return channels, err
}
// fetchOpenChannels uses and existing database transaction and returns all
// stored currently active/open channels associated with the target nodeID. In
// the case that no active channels are known to have been created with this
// node, then a zero-length slice is returned.
func (c *ChannelStateDB) fetchOpenChannels(tx kvdb.RTx,
nodeID *secp256k1.PublicKey) ([]*OpenChannel, error) {
// Get the bucket dedicated to storing the metadata for open channels.
openChanBucket := tx.ReadBucket(openChannelBucket)
if openChanBucket == nil {
return nil, nil
}
// Within this top level bucket, fetch the bucket dedicated to storing
// open channel data specific to the remote node.
pub := nodeID.SerializeCompressed()
nodeChanBucket := openChanBucket.NestedReadBucket(pub)
if nodeChanBucket == nil {
return nil, nil
}
// Next, we'll need to go down an additional layer in order to retrieve
// the channels for each chain the node knows of.
var channels []*OpenChannel
err := nodeChanBucket.ForEach(func(chainHash, v []byte) error {
// If there's a value, it's not a bucket so ignore it.
if v != nil {
return nil
}
// If we've found a valid chainhash bucket, then we'll retrieve
// that so we can extract all the channels.
chainBucket := nodeChanBucket.NestedReadBucket(chainHash)
if chainBucket == nil {
return fmt.Errorf("unable to read bucket for chain=%x",
chainHash)
}
// Finally, we both of the necessary buckets retrieved, fetch
// all the active channels related to this node.
nodeChannels, err := c.fetchNodeChannels(chainBucket)
if err != nil {
return fmt.Errorf("unable to read channel for "+
"chain_hash=%x, node_key=%x: %v",
chainHash, pub, err)
}
channels = append(channels, nodeChannels...)
return nil
})
return channels, err
}
// fetchNodeChannels retrieves all active channels from the target chainBucket
// which is under a node's dedicated channel bucket. This function is typically
// used to fetch all the active channels related to a particular node.
func (c *ChannelStateDB) fetchNodeChannels(chainBucket kvdb.RBucket) (
[]*OpenChannel, error) {
var channels []*OpenChannel
// A node may have channels on several chains, so for each known chain,
// we'll extract all the channels.
err := chainBucket.ForEach(func(chanPoint, v []byte) error {
// If there's a value, it's not a bucket so ignore it.
if v != nil {
return nil
}
// Once we've found a valid channel bucket, we'll extract it
// from the node's chain bucket.
chanBucket := chainBucket.NestedReadBucket(chanPoint)
var outPoint wire.OutPoint
err := readOutpoint(bytes.NewReader(chanPoint), &outPoint)
if err != nil {
return err
}
oChannel, err := fetchOpenChannel(chanBucket, &outPoint)
if err != nil {
return fmt.Errorf("unable to read channel data for "+
"chan_point=%v: %v", outPoint, err)
}
oChannel.Db = c
channels = append(channels, oChannel)
return nil
})
if err != nil {
return nil, err
}
return channels, nil
}
// FetchChannel attempts to locate a channel specified by the passed channel
// point. If the channel cannot be found, then an error will be returned.
// Optionally an existing db tx can be supplied. Optionally an existing db tx
// can be supplied.
func (c *ChannelStateDB) FetchChannel(tx kvdb.RTx, chanPoint wire.OutPoint) (
*OpenChannel, error) {
var (
targetChan *OpenChannel
targetChanPoint bytes.Buffer
)
if err := writeOutpoint(&targetChanPoint, &chanPoint); err != nil {
return nil, err
}
// chanScan will traverse the following bucket structure:
// * nodePub => chainHash => chanPoint
//
// At each level we go one further, ensuring that we're traversing the
// proper key (that's actually a bucket). By only reading the bucket
// structure and skipping fully decoding each channel, we save a good
// bit of CPU as we don't need to do things like decompress public
// keys.
chanScan := func(tx kvdb.RTx) error {
// Get the bucket dedicated to storing the metadata for open
// channels.
openChanBucket := tx.ReadBucket(openChannelBucket)
if openChanBucket == nil {
return ErrNoActiveChannels
}
// Within the node channel bucket, are the set of node pubkeys
// we have channels with, we don't know the entire set, so
// we'll check them all.
return openChanBucket.ForEach(func(nodePub, v []byte) error {
// Ensure that this is a key the same size as a pubkey,
// and also that it leads directly to a bucket.
if len(nodePub) != 33 || v != nil {
return nil
}
nodeChanBucket := openChanBucket.NestedReadBucket(nodePub)
if nodeChanBucket == nil {
return nil
}
// The next layer down is all the chains that this node
// has channels on with us.
return nodeChanBucket.ForEach(func(chainHash, v []byte) error {
// If there's a value, it's not a bucket so
// ignore it.
if v != nil {
return nil
}
chainBucket := nodeChanBucket.NestedReadBucket(
chainHash,
)
if chainBucket == nil {
return fmt.Errorf("unable to read "+
"bucket for chain=%x", chainHash[:])
}
// Finally we reach the leaf bucket that stores
// all the chanPoints for this node.
chanBucket := chainBucket.NestedReadBucket(
targetChanPoint.Bytes(),
)
if chanBucket == nil {
return nil
}
channel, err := fetchOpenChannel(
chanBucket, &chanPoint,
)
if err != nil {
return err
}
targetChan = channel
targetChan.Db = c
return nil
})
})
}
var err error
if tx == nil {
err = kvdb.View(c.backend, chanScan, func() {})
} else {
err = chanScan(tx)
}
if err != nil {
return nil, err
}
if targetChan != nil {
return targetChan, nil
}
// If we can't find the channel, then we return with an error, as we
// have nothing to backup.
return nil, ErrChannelNotFound
}
// FetchAllChannels attempts to retrieve all open channels currently stored
// within the database, including pending open, fully open and channels waiting
// for a closing transaction to confirm.
func (c *ChannelStateDB) FetchAllChannels() ([]*OpenChannel, error) {
return fetchChannels(c)
}
// FetchAllOpenChannels will return all channels that have the funding
// transaction confirmed, and is not waiting for a closing transaction to be
// confirmed.
func (c *ChannelStateDB) FetchAllOpenChannels() ([]*OpenChannel, error) {
return fetchChannels(
c,
pendingChannelFilter(false),
waitingCloseFilter(false),
)
}
// FetchPendingChannels will return channels that have completed the process of
// generating and broadcasting funding transactions, but whose funding
// transactions have yet to be confirmed on the blockchain.
func (c *ChannelStateDB) FetchPendingChannels() ([]*OpenChannel, error) {
return fetchChannels(c,
pendingChannelFilter(true),
waitingCloseFilter(false),
)
}
// FetchWaitingCloseChannels will return all channels that have been opened,
// but are now waiting for a closing transaction to be confirmed.
//
// NOTE: This includes channels that are also pending to be opened.
func (c *ChannelStateDB) FetchWaitingCloseChannels() ([]*OpenChannel, error) {
return fetchChannels(
c, waitingCloseFilter(true),
)
}
// fetchChannelsFilter applies a filter to channels retrieved in fetchchannels.
// A set of filters can be combined to filter across multiple dimensions.
type fetchChannelsFilter func(channel *OpenChannel) bool
// pendingChannelFilter returns a filter based on whether channels are pending
// (ie, their funding transaction still needs to confirm). If pending is false,
// channels with confirmed funding transactions are returned.
func pendingChannelFilter(pending bool) fetchChannelsFilter {
return func(channel *OpenChannel) bool {
return channel.IsPending == pending
}
}
// waitingCloseFilter returns a filter which filters channels based on whether
// they are awaiting the confirmation of their closing transaction. If waiting
// close is true, channels that have had their closing tx broadcast are
// included. If it is false, channels that are not awaiting confirmation of
// their close transaction are returned.
func waitingCloseFilter(waitingClose bool) fetchChannelsFilter {
return func(channel *OpenChannel) bool {
// If the channel is in any other state than Default,
// then it means it is waiting to be closed.
channelWaitingClose :=
channel.ChanStatus() != ChanStatusDefault
// Include the channel if it matches the value for
// waiting close that we are filtering on.
return channelWaitingClose == waitingClose
}
}
// fetchChannels attempts to retrieve channels currently stored in the
// database. It takes a set of filters which are applied to each channel to
// obtain a set of channels with the desired set of properties. Only channels
// which have a true value returned for *all* of the filters will be returned.
// If no filters are provided, every channel in the open channels bucket will
// be returned.
func fetchChannels(c *ChannelStateDB, filters ...fetchChannelsFilter) (
[]*OpenChannel, error) {
var channels []*OpenChannel
err := kvdb.View(c.backend, func(tx kvdb.RTx) error {
// Get the bucket dedicated to storing the metadata for open
// channels.
openChanBucket := tx.ReadBucket(openChannelBucket)
if openChanBucket == nil {
return ErrNoActiveChannels
}
// Next, fetch the bucket dedicated to storing metadata related
// to all nodes. All keys within this bucket are the serialized
// public keys of all our direct counterparties.
nodeMetaBucket := tx.ReadBucket(nodeInfoBucket)
if nodeMetaBucket == nil {
return fmt.Errorf("node bucket not created")
}
// Finally for each node public key in the bucket, fetch all
// the channels related to this particular node.
return nodeMetaBucket.ForEach(func(k, v []byte) error {
nodeChanBucket := openChanBucket.NestedReadBucket(k)
if nodeChanBucket == nil {
return nil
}
return nodeChanBucket.ForEach(func(chainHash, v []byte) error {
// If there's a value, it's not a bucket so
// ignore it.
if v != nil {
return nil
}
// If we've found a valid chainhash bucket,
// then we'll retrieve that so we can extract
// all the channels.
chainBucket := nodeChanBucket.NestedReadBucket(
chainHash,
)
if chainBucket == nil {
return fmt.Errorf("unable to read "+
"bucket for chain=%x", chainHash)
}
nodeChans, err := c.fetchNodeChannels(chainBucket)
if err != nil {
return fmt.Errorf("unable to read "+
"channel for chain_hash=%x, "+
"node_key=%x: %v", chainHash, k, err)
}
for _, channel := range nodeChans {
// includeChannel indicates whether the channel
// meets the criteria specified by our filters.
includeChannel := true
// Run through each filter and check whether the
// channel should be included.
for _, f := range filters {
// If the channel fails the filter, set
// includeChannel to false and don't bother
// checking the remaining filters.
if !f(channel) {
includeChannel = false
break
}
}
// If the channel passed every filter, include it in
// our set of channels.
if includeChannel {
channels = append(channels, channel)
}
}
return nil
})
})
}, func() {
channels = nil
})
if err != nil {
return nil, err
}
return channels, nil
}
// FetchClosedChannels attempts to fetch all closed channels from the database.
// The pendingOnly bool toggles if channels that aren't yet fully closed should
// be returned in the response or not. When a channel was cooperatively closed,
// it becomes fully closed after a single confirmation. When a channel was
// forcibly closed, it will become fully closed after _all_ the pending funds
// (if any) have been swept.
func (c *ChannelStateDB) FetchClosedChannels(pendingOnly bool) (
[]*ChannelCloseSummary, error) {
var chanSummaries []*ChannelCloseSummary
if err := kvdb.View(c.backend, func(tx kvdb.RTx) error {
closeBucket := tx.ReadBucket(closedChannelBucket)
if closeBucket == nil {
return ErrNoClosedChannels
}
return closeBucket.ForEach(func(chanID []byte, summaryBytes []byte) error {
summaryReader := bytes.NewReader(summaryBytes)
chanSummary, err := deserializeCloseChannelSummary(summaryReader)
if err != nil {
return err
}
// If the query specified to only include pending
// channels, then we'll skip any channels which aren't
// currently pending.
if !chanSummary.IsPending && pendingOnly {
return nil
}
chanSummaries = append(chanSummaries, chanSummary)
return nil
})
}, func() {
chanSummaries = nil
}); err != nil {
return nil, err
}
return chanSummaries, nil
}
// ErrClosedChannelNotFound signals that a closed channel could not be found in
// the channeldb.
var ErrClosedChannelNotFound = errors.New("unable to find closed channel summary")
// FetchClosedChannel queries for a channel close summary using the channel
// point of the channel in question.
func (c *ChannelStateDB) FetchClosedChannel(chanID *wire.OutPoint) (
*ChannelCloseSummary, error) {
var chanSummary *ChannelCloseSummary
if err := kvdb.View(c.backend, func(tx kvdb.RTx) error {
closeBucket := tx.ReadBucket(closedChannelBucket)
if closeBucket == nil {
return ErrClosedChannelNotFound
}
var b bytes.Buffer
var err error
if err = writeOutpoint(&b, chanID); err != nil {
return err
}
summaryBytes := closeBucket.Get(b.Bytes())
if summaryBytes == nil {
return ErrClosedChannelNotFound
}
summaryReader := bytes.NewReader(summaryBytes)
chanSummary, err = deserializeCloseChannelSummary(summaryReader)
return err
}, func() {
chanSummary = nil
}); err != nil {
return nil, err
}
return chanSummary, nil
}
// FetchClosedChannelForID queries for a channel close summary using the
// channel ID of the channel in question.
func (c *ChannelStateDB) FetchClosedChannelForID(cid lnwire.ChannelID) (
*ChannelCloseSummary, error) {
var chanSummary *ChannelCloseSummary
if err := kvdb.View(c.backend, func(tx kvdb.RTx) error {
closeBucket := tx.ReadBucket(closedChannelBucket)
if closeBucket == nil {
return ErrClosedChannelNotFound
}
// The first 30 bytes of the channel ID and outpoint will be
// equal.
cursor := closeBucket.ReadCursor()
op, c := cursor.Seek(cid[:30])
// We scan over all possible candidates for this channel ID.
for ; op != nil && bytes.Compare(cid[:30], op[:30]) <= 0; op, c = cursor.Next() {
var outPoint wire.OutPoint
err := readOutpoint(bytes.NewReader(op), &outPoint)
if err != nil {
return err
}
// If the found outpoint does not correspond to this
// channel ID, we continue.
if !cid.IsChanPoint(&outPoint) {
continue
}
// Deserialize the close summary and return.
r := bytes.NewReader(c)
chanSummary, err = deserializeCloseChannelSummary(r)
if err != nil {
return err
}
return nil
}
return ErrClosedChannelNotFound
}, func() {
chanSummary = nil
}); err != nil {
return nil, err
}
return chanSummary, nil
}
// MarkChanFullyClosed marks a channel as fully closed within the database. A
// channel should be marked as fully closed if the channel was initially
// cooperatively closed and it's reached a single confirmation, or after all
// the pending funds in a channel that has been forcibly closed have been
// swept.
func (c *ChannelStateDB) MarkChanFullyClosed(chanPoint *wire.OutPoint) error {
var (
openChannels []*OpenChannel
pruneLinkNode *secp256k1.PublicKey
)
err := kvdb.Update(c.backend, func(tx kvdb.RwTx) error {
var b bytes.Buffer
if err := writeOutpoint(&b, chanPoint); err != nil {
return err
}
chanID := b.Bytes()
closedChanBucket, err := tx.CreateTopLevelBucket(
closedChannelBucket,
)
if err != nil {
return err
}
chanSummaryBytes := closedChanBucket.Get(chanID)
if chanSummaryBytes == nil {
return fmt.Errorf("no closed channel for "+
"chan_point=%v found", chanPoint)
}
chanSummaryReader := bytes.NewReader(chanSummaryBytes)
chanSummary, err := deserializeCloseChannelSummary(
chanSummaryReader,
)
if err != nil {
return err
}
chanSummary.IsPending = false
var newSummary bytes.Buffer
err = serializeChannelCloseSummary(&newSummary, chanSummary)
if err != nil {
return err
}
err = closedChanBucket.Put(chanID, newSummary.Bytes())
if err != nil {
return err