channeldb: create new channeldb package, update lnwallet to use new API

* Initial draft of brain dump of chandler. Nothing yet set in stone.
* Will most likely move the storage of all structs to a more “column”
oriented approach. Such that, small updates like incrementing the total
satoshi sent don’t result in the entire struct being serialized and
written.
* Some skeleton structs for other possible data we might want to store
are also included.
* Seem valuable to record as much data as possible for record keeping,
visualization, debugging, etc. Will need to set up a time+space+dirty
cache to ensure performance isn’t impacted too much.

channeldb/channel.go

@@ -1,4 +1,4 @@
-package lnwallet
+package channeldb
 
 import (
 	"bytes"
@@ -7,137 +7,38 @@ import (
 	"io"
 	"time"
 
-	"li.lan/labs/plasma/shachain"
-
 	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
 	"github.com/btcsuite/btcwallet/waddrmgr"
 	"github.com/btcsuite/btcwallet/walletdb"
+	"li.lan/labs/plasma/shachain"
 )
 
 var (
-	// Namespace bucket keys.
-	lightningNamespaceKey = []byte("ln-wallet")
-	waddrmgrNamespaceKey  = []byte("waddrmgr")
-	wtxmgrNamespaceKey    = []byte("wtxmgr")
-
 	openChannelBucket   = []byte("o")
 	closedChannelBucket = []byte("c")
 	activeChanKey       = []byte("a")
 
-	endian = binary.BigEndian
+	// TODO(roasbeef): replace w/ tesnet-L also revisit dependancy...
+	ActiveNetParams = &chaincfg.TestNet3Params
 )
 
-// ChannelDB...
-// TODO(roasbeef): CHECKSUMS, REDUNDANCY, etc etc.
-type ChannelDB struct {
-	// TODO(roasbeef): caching, etc?
-	addrmgr *waddrmgr.Manager
-
-	namespace walletdb.Namespace
+// Payment...
+type Payment struct {
+	// r [32]byte
+	// path *Route
 }
 
-// PutOpenChannel...
-func (c *ChannelDB) PutOpenChannel(channel *OpenChannelState) error {
-	return c.namespace.Update(func(tx walletdb.Tx) error {
-		// Get the bucket dedicated to storing the meta-data for open
-		// channels.
-		rootBucket := tx.RootBucket()
-		openChanBucket, err := rootBucket.CreateBucketIfNotExists(openChannelBucket)
-		if err != nil {
-			return err
-		}
-
-		return dbPutOpenChannel(openChanBucket, channel, c.addrmgr)
-	})
+// ClosedChannel...
+type ClosedChannel struct {
 }
 
-// GetOpenChannel...
-// TODO(roasbeef): assumes only 1 active channel per-node
-func (c *ChannelDB) FetchOpenChannel(nodeID [32]byte) (*OpenChannelState, error) {
-	var channel *OpenChannelState
-
-	dbErr := c.namespace.View(func(tx walletdb.Tx) error {
-		// Get the bucket dedicated to storing the meta-data for open
-		// channels.
-		rootBucket := tx.RootBucket()
-		openChanBucket := rootBucket.Bucket(openChannelBucket)
-		if openChannelBucket == nil {
-			return fmt.Errorf("open channel bucket does not exist")
-		}
-
-		oChannel, err := dbGetOpenChannel(openChanBucket, nodeID, c.addrmgr)
-		if err != nil {
-			return err
-		}
-		channel = oChannel
-		return nil
-	})
-
-	return channel, dbErr
-}
-
-// dbPutChannel...
-func dbPutOpenChannel(activeChanBucket walletdb.Bucket, channel *OpenChannelState,
-	addrmgr *waddrmgr.Manager) error {
-
-	// Generate a serialized version of the open channel. The addrmgr is
-	// required in order to encrypt densitive data.
-	var b bytes.Buffer
-	if err := channel.Encode(&b, addrmgr); err != nil {
-		return err
-	}
-
-	// Grab the bucket dedicated to storing data related to this particular
-	// node.
-	nodeBucket, err := activeChanBucket.CreateBucketIfNotExists(channel.TheirLNID[:])
-	if err != nil {
-		return err
-	}
-
-	return nodeBucket.Put(activeChanKey, b.Bytes())
-}
-
-// dbPutChannel...
-func dbGetOpenChannel(bucket walletdb.Bucket, nodeID [32]byte,
-	addrmgr *waddrmgr.Manager) (*OpenChannelState, error) {
-
-	// Grab the bucket dedicated to storing data related to this particular
-	// node.
-	nodeBucket := bucket.Bucket(nodeID[:])
-	if nodeBucket == nil {
-		return nil, fmt.Errorf("channel bucket for node does not exist")
-	}
-
-	serializedChannel := nodeBucket.Get(activeChanKey)
-	if serializedChannel == nil {
-		// TODO(roasbeef): make proper in error.go
-		return nil, fmt.Errorf("node has no open channels")
-	}
-
-	// Decode the serialized channel state, using the addrmgr to decrypt
-	// sensitive information.
-	channel := &OpenChannelState{}
-	reader := bytes.NewReader(serializedChannel)
-	if err := channel.Decode(reader, addrmgr); err != nil {
-		return nil, err
-	}
-
-	return channel, nil
-}
-
-// NewChannelDB...
-// TODO(roasbeef): re-visit this dependancy...
-func NewChannelDB(addrmgr *waddrmgr.Manager, namespace walletdb.Namespace) *ChannelDB {
-	// TODO(roasbeef): create buckets if not created?
-	return &ChannelDB{addrmgr, namespace}
-}
-
-// OpenChannelState...
+// OpenChannel...
 // TODO(roasbeef): store only the essentials? optimize space...
 // TODO(roasbeef): switch to "column store"
-type OpenChannelState struct {
+type OpenChannel struct {
 	// Hash? or Their current pubKey?
 	// TODO(roasbeef): switch to Tadge's LNId
 	TheirLNID [wire.HashSize]byte
@@ -194,9 +95,99 @@ type OpenChannelState struct {
 	CreationTime          time.Time
 }
 
+// PutOpenChannel...
+func (c *DB) PutOpenChannel(channel *OpenChannel) error {
+	return c.namespace.Update(func(tx walletdb.Tx) error {
+		// Get the bucket dedicated to storing the meta-data for open
+		// channels.
+		rootBucket := tx.RootBucket()
+		openChanBucket, err := rootBucket.CreateBucketIfNotExists(openChannelBucket)
+		if err != nil {
+			return err
+		}
+
+		return putOpenChannel(openChanBucket, channel, c.addrmgr)
+	})
+}
+
+// GetOpenChannel...
+// TODO(roasbeef): assumes only 1 active channel per-node
+func (c *DB) FetchOpenChannel(nodeID [32]byte) (*OpenChannel, error) {
+	var channel *OpenChannel
+
+	err := c.namespace.View(func(tx walletdb.Tx) error {
+		// Get the bucket dedicated to storing the meta-data for open
+		// channels.
+		rootBucket := tx.RootBucket()
+		openChanBucket := rootBucket.Bucket(openChannelBucket)
+		if openChannelBucket == nil {
+			return fmt.Errorf("open channel bucket does not exist")
+		}
+
+		oChannel, err := fetchOpenChannel(openChanBucket, nodeID,
+			c.addrmgr)
+		if err != nil {
+			return err
+		}
+		channel = oChannel
+		return nil
+	})
+
+	return channel, err
+}
+
+// putChannel...
+func putOpenChannel(activeChanBucket walletdb.Bucket, channel *OpenChannel,
+	addrmgr *waddrmgr.Manager) error {
+
+	// Generate a serialized version of the open channel. The addrmgr is
+	// required in order to encrypt densitive data.
+	var b bytes.Buffer
+	if err := channel.Encode(&b, addrmgr); err != nil {
+		return err
+	}
+
+	// Grab the bucket dedicated to storing data related to this particular
+	// node.
+	nodeBucket, err := activeChanBucket.CreateBucketIfNotExists(channel.TheirLNID[:])
+	if err != nil {
+		return err
+	}
+
+	return nodeBucket.Put(activeChanKey, b.Bytes())
+}
+
+// fetchOpenChannel
+func fetchOpenChannel(bucket walletdb.Bucket, nodeID [32]byte,
+	addrmgr *waddrmgr.Manager) (*OpenChannel, error) {
+
+	// Grab the bucket dedicated to storing data related to this particular
+	// node.
+	nodeBucket := bucket.Bucket(nodeID[:])
+	if nodeBucket == nil {
+		return nil, fmt.Errorf("channel bucket for node does not exist")
+	}
+
+	serializedChannel := nodeBucket.Get(activeChanKey)
+	if serializedChannel == nil {
+		// TODO(roasbeef): make proper in error.go
+		return nil, fmt.Errorf("node has no open channels")
+	}
+
+	// Decode the serialized channel state, using the addrmgr to decrypt
+	// sensitive information.
+	channel := &OpenChannel{}
+	reader := bytes.NewReader(serializedChannel)
+	if err := channel.Decode(reader, addrmgr); err != nil {
+		return nil, err
+	}
+
+	return channel, nil
+}
+
 // Encode...
 // TODO(roasbeef): checksum
-func (o *OpenChannelState) Encode(b io.Writer, addrManager *waddrmgr.Manager) error {
+func (o *OpenChannel) Encode(b io.Writer, addrManager *waddrmgr.Manager) error {
 	if _, err := b.Write(o.TheirLNID[:]); err != nil {
 		return err
 	}
@@ -289,7 +280,7 @@ func (o *OpenChannelState) Encode(b io.Writer, addrManager *waddrmgr.Manager) er
 }
 
 // Decode...
-func (o *OpenChannelState) Decode(b io.Reader, addrManager *waddrmgr.Manager) error {
+func (o *OpenChannel) Decode(b io.Reader, addrManager *waddrmgr.Manager) error {
 	var scratch [8]byte
 
 	if _, err := b.Read(o.TheirLNID[:]); err != nil {

channeldb/channel_test.go

@@ -1,7 +1,8 @@
-package lnwallet
+package channeldb
 
 import (
 	"bytes"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -14,6 +15,7 @@ import (
 	"github.com/btcsuite/btcutil"
 	"github.com/btcsuite/btcwallet/waddrmgr"
 	"github.com/btcsuite/btcwallet/walletdb"
+	_ "github.com/btcsuite/btcwallet/walletdb/bdb"
 )
 
 var (
@@ -69,10 +71,11 @@ var (
 func createDbNamespace(dbPath string) (walletdb.DB, walletdb.Namespace, error) {
 	db, err := walletdb.Create("bdb", dbPath)
 	if err != nil {
+		fmt.Println("fuk")
 		return nil, nil, err
 	}
 
-	namespace, err := db.Namespace(waddrmgrNamespaceKey)
+	namespace, err := db.Namespace([]byte("waddr"))
 	if err != nil {
 		db.Close()
 		return nil, nil, err
@@ -115,11 +118,11 @@ func createTestManager(t *testing.T) (tearDownFunc func(), mgr *waddrmgr.Manager
 	return tearDownFunc, mgr
 }
 
-func TestOpenChannelStateEncodeDecode(t *testing.T) {
+func TestOpenChannelEncodeDecode(t *testing.T) {
 	teardown, manager := createTestManager(t)
 	defer teardown()
 
-	privKey, pubKey := btcec.PrivKeyFromBytes(btcec.S256(), testWalletPrivKey)
+	privKey, pubKey := btcec.PrivKeyFromBytes(btcec.S256(), key[:])
 	addr, err := btcutil.NewAddressPubKey(pubKey.SerializeCompressed(), ActiveNetParams)
 	if err != nil {
 		t.Fatalf("unable to create delivery address")
@@ -130,7 +133,7 @@ func TestOpenChannelStateEncodeDecode(t *testing.T) {
 		t.Fatalf("unable to create redeemScript")
 	}
 
-	state := OpenChannelState{
+	state := OpenChannel{
 		TheirLNID:              id,
 		ChanID:                 id,
 		MinFeePerKb:            btcutil.Amount(5000),
@@ -161,7 +164,7 @@ func TestOpenChannelStateEncodeDecode(t *testing.T) {
 	}
 
 	reader := bytes.NewReader(b.Bytes())
-	newState := &OpenChannelState{}
+	newState := &OpenChannel{}
 	if err := newState.Decode(reader, manager); err != nil {
 		t.Fatalf("unable to decode channel state: %v", err)
 	}
@@ -274,5 +277,5 @@ func TestOpenChannelStateEncodeDecode(t *testing.T) {
 	}
 }
 
-func TestOpenChannelStateEncodeDecodeCorruption(t *testing.T) {
+func TestOpenChannelEncodeDecodeCorruption(t *testing.T) {
 }

channeldb/db.go

@@ -0,0 +1,54 @@
+package channeldb
+
+import (
+	"bytes"
+	"encoding/binary"
+	"sync"
+
+	"github.com/btcsuite/btcwallet/waddrmgr"
+	"github.com/btcsuite/btcwallet/walletdb"
+)
+
+var (
+	endian = binary.BigEndian
+)
+
+var bufPool = &sync.Pool{
+	New: func() interface{} { return new(bytes.Buffer) },
+}
+
+// Store...
+// TODO(roasbeef): CHECKSUMS, REDUNDANCY, etc etc.
+type DB struct {
+	// TODO(roasbeef): caching, etc?
+	addrmgr *waddrmgr.Manager
+
+	namespace walletdb.Namespace
+}
+
+// Wipe...
+func (d *DB) Wipe() error {
+	return d.namespace.Update(func(tx walletdb.Tx) error {
+		rootBucket := tx.RootBucket()
+		// TODO(roasbeef): other buckets
+		return rootBucket.DeleteBucket(openChannelBucket)
+	})
+}
+
+// New...
+// TODO(roasbeef): re-visit this dependancy...
+func New(addrmgr *waddrmgr.Manager, namespace walletdb.Namespace) *DB {
+	// TODO(roasbeef): create buckets if not created?
+	return &DB{addrmgr, namespace}
+}
+
+// Open...
+// TODO(roasbeef): create+open, ditch New, fixes above
+func Open() *DB {
+	return nil
+}
+
+// Create...
+func Create() *DB {
+	return nil
+}

channeldb/doc.go

@@ -0,0 +1 @@
+package channeldb

channeldb/error.go

@@ -0,0 +1 @@
+package channeldb

channeldb/fees.go

@@ -0,0 +1 @@
+package channeldb

channeldb/log.go

@@ -0,0 +1 @@
+package channeldb

channeldb/nodes.go

@@ -0,0 +1 @@
+package channeldb

channeldb/route.go

@@ -0,0 +1 @@
+package channeldb

lnwallet/channel.go

@@ -27,11 +27,11 @@ type LightningChannel struct {
 	// commitment update, plus some other meta-data...Or just use OP_RETURN
 	// to help out?
 	// currently going for: nSequence/nLockTime overloading
-	channelDB *ChannelDB
+	channelDB *channeldb.DB
 
 	// stateMtx protects concurrent access to the state struct.
 	stateMtx     sync.RWMutex
-	channelState OpenChannelState
+	channelState channeldb.OpenChannel
 
 	// TODO(roasbeef): create and embed 'Service' interface w/ below?
 	started  int32
@@ -44,6 +44,7 @@ type LightningChannel struct {
 // newLightningChannel...
 func newLightningChannel(wallet *LightningWallet, events *chainntnfs.ChainNotifier,
 	chanDB *ChannelDB, state OpenChannelState) (*LightningChannel, error) {
+	chanDB *channeldb.DB, state channeldb.OpenChannel) (*LightningChannel, error) {
 
 	return &LightningChannel{
 		wallet:        wallet,

lnwallet/reservation.go

@@ -3,6 +3,8 @@ package lnwallet
 import (
 	"sync"
 
+	"li.lan/labs/plasma/channeldb"
+
 	"github.com/btcsuite/btcd/btcec"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
@@ -64,7 +66,7 @@ type ChannelReservation struct {
 	ourContribution   *ChannelContribution
 	theirContribution *ChannelContribution
 
-	partialState *OpenChannelState
+	partialState *channeldb.OpenChannel
 
 	// The ID of this reservation, used to uniquely track the reservation
 	// throughout its lifetime.
@@ -90,7 +92,7 @@ func newChannelReservation(t FundingType, fundingAmt btcutil.Amount,
 		theirContribution: &ChannelContribution{
 			FundingAmount: fundingAmt,
 		},
-		partialState: &OpenChannelState{
+		partialState: &channeldb.OpenChannel{
 			// TODO(roasbeef): assumes balanced symmetric channels.
 			Capacity:     fundingAmt * 2,
 			OurBalance:   fundingAmt,

lnwallet/wallet.go

@@ -1,6 +1,7 @@
 package lnwallet
 
 import (
+	"encoding/binary"
 	"errors"
 	"fmt"
 	"math"
@@ -9,6 +10,7 @@ import (
 	"sync"
 	"sync/atomic"
 
+	"li.lan/labs/plasma/channeldb"
 	"li.lan/labs/plasma/shachain"
 
 	"github.com/btcsuite/btcd/btcec"
@@ -34,7 +36,14 @@ var (
 		"create funding transaction")
 
 	// Which bitcoin network are we using?
+	// TODO(roasbeef): config
 	ActiveNetParams = &chaincfg.TestNet3Params
+	// Namespace bucket keys.
+	lightningNamespaceKey = []byte("ln-wallet")
+	waddrmgrNamespaceKey  = []byte("waddrmgr")
+	wtxmgrNamespaceKey    = []byte("wtxmgr")
+
+	endian = binary.BigEndian
 )
 
 type FundingType uint16
@@ -137,7 +146,7 @@ type LightningWallet struct {
 
 	// A wrapper around a namespace within boltdb reserved for ln-based
 	// wallet meta-data.
-	channelDB *ChannelDB
+	channelDB *channeldb.DB
 
 	wallet *btcwallet.Wallet
 	rpc    *chain.Client
@@ -210,7 +219,7 @@ func NewLightningWallet(privWalletPass, pubWalletPass, hdSeed []byte, dataDir st
 	return &LightningWallet{
 		DB:        db,
 		wallet:    wallet,
-		channelDB: NewChannelDB(wallet.Manager, lnNamespace),
+		channelDB: channeldb.New(wallet.Manager, lnNamespace),
 		msgChan:   make(chan interface{}, msgBufferSize),
 		// TODO(roasbeef): make this atomic.Uint32 instead? Which is
 		// faster, locks or CAS? I'm guessing CAS because assembly:

lnwallet/wallet_test.go

@@ -591,10 +591,7 @@ func clearWalletState(w *LightningWallet) error {
 	w.nextFundingID = 0
 	w.fundingLimbo = make(map[uint64]*ChannelReservation)
 	w.wallet.ResetLockedOutpoints()
-	return w.channelDB.namespace.Update(func(tx walletdb.Tx) error {
-		rootBucket := tx.RootBucket()
-		return rootBucket.DeleteBucket(openChannelBucket)
-	})
+	return w.channelDB.Wipe()
 }
 
 // TODO(roasbeef): why is wallet so slow to create+open?