neutrino: enable user to assert filter header chain.

chainregistry.go

@@ -19,6 +19,7 @@ import (
 	"github.com/btcsuite/btcwallet/wallet"
 	"github.com/btcsuite/btcwallet/walletdb"
 	"github.com/lightninglabs/neutrino"
+	"github.com/lightninglabs/neutrino/headerfs"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/chainntnfs/bitcoindnotify"
 	"github.com/lightningnetwork/lnd/chainntnfs/btcdnotify"
@@ -705,6 +706,13 @@ func initNeutrinoBackend(chainDir string) (*neutrino.ChainService, func(), error
 			"database: %v", err)
 	}
 
+	headerStateAssertion, err := parseHeaderStateAssertion(
+		cfg.NeutrinoMode.AssertFilterHeader,
+	)
+	if err != nil {
+		return nil, nil, err
+	}
+
 	// With the database open, we can now create an instance of the
 	// neutrino light client. We pass in relevant configuration parameters
 	// required.
@@ -735,6 +743,7 @@ func initNeutrinoBackend(chainDir string) (*neutrino.ChainService, func(), error
 
 			return ips, nil
 		},
+		AssertFilterHeader: headerStateAssertion,
 	}
 
 	neutrino.MaxPeers = 8
@@ -758,3 +767,32 @@ func initNeutrinoBackend(chainDir string) (*neutrino.ChainService, func(), error
 
 	return neutrinoCS, cleanUp, nil
 }
+
+// parseHeaderStateAssertion parses the user-specified neutrino header state
+// into a headerfs.FilterHeader.
+func parseHeaderStateAssertion(state string) (*headerfs.FilterHeader, error) {
+	if len(state) == 0 {
+		return nil, nil
+	}
+
+	split := strings.Split(state, ":")
+	if len(split) != 2 {
+		return nil, fmt.Errorf("header state assertion %v in "+
+			"unexpected format, expected format height:hash", state)
+	}
+
+	height, err := strconv.ParseUint(split[0], 10, 32)
+	if err != nil {
+		return nil, fmt.Errorf("invalid filter header height: %v", err)
+	}
+
+	hash, err := chainhash.NewHashFromStr(split[1])
+	if err != nil {
+		return nil, fmt.Errorf("invalid filter header hash: %v", err)
+	}
+
+	return &headerfs.FilterHeader{
+		Height:     uint32(height),
+		FilterHash: *hash,
+	}, nil
+}

config.go

@@ -169,12 +169,13 @@ type chainConfig struct {
 }
 
 type neutrinoConfig struct {
-	AddPeers     []string      `short:"a" long:"addpeer" description:"Add a peer to connect with at startup"`
-	ConnectPeers []string      `long:"connect" description:"Connect only to the specified peers at startup"`
-	MaxPeers     int           `long:"maxpeers" description:"Max number of inbound and outbound peers"`
-	BanDuration  time.Duration `long:"banduration" description:"How long to ban misbehaving peers.  Valid time units are {s, m, h}.  Minimum 1 second"`
-	BanThreshold uint32        `long:"banthreshold" description:"Maximum allowed ban score before disconnecting and banning misbehaving peers."`
-	FeeURL       string        `long:"feeurl" description:"Optional URL for fee estimation. If a URL is not specified, static fees will be used for estimation."`
+	AddPeers           []string      `short:"a" long:"addpeer" description:"Add a peer to connect with at startup"`
+	ConnectPeers       []string      `long:"connect" description:"Connect only to the specified peers at startup"`
+	MaxPeers           int           `long:"maxpeers" description:"Max number of inbound and outbound peers"`
+	BanDuration        time.Duration `long:"banduration" description:"How long to ban misbehaving peers.  Valid time units are {s, m, h}.  Minimum 1 second"`
+	BanThreshold       uint32        `long:"banthreshold" description:"Maximum allowed ban score before disconnecting and banning misbehaving peers."`
+	FeeURL             string        `long:"feeurl" description:"Optional URL for fee estimation. If a URL is not specified, static fees will be used for estimation."`
+	AssertFilterHeader string        `long:"assertfilterheader" description:"Optional filter header in height:hash format to assert the state of neutrino's filter header chain on startup. If the assertion does not hold, then the filter header chain will be re-synced from the genesis block."`
 }
 
 type btcdConfig struct {

go.mod

@@ -5,7 +5,7 @@ require (
 	github.com/NebulousLabs/fastrand v0.0.0-20180208210444-3cf7173006a0 // indirect
 	github.com/NebulousLabs/go-upnp v0.0.0-20180202185039-29b680b06c82
 	github.com/Yawning/aez v0.0.0-20180114000226-4dad034d9db2
-	github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c
+	github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50
 	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
 	github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
 	github.com/btcsuite/btcwallet v0.0.0-20190524003533-2c05240dff28
@@ -27,7 +27,7 @@ require (
 	github.com/juju/utils v0.0.0-20180820210520-bf9cc5bdd62d // indirect
 	github.com/juju/version v0.0.0-20180108022336-b64dbd566305 // indirect
 	github.com/kkdai/bstream v0.0.0-20181106074824-b3251f7901ec
-	github.com/lightninglabs/neutrino v0.0.0-20190521105038-03deaa76ddc2
+	github.com/lightninglabs/neutrino v0.0.0-20190606084233-98b149cd0468
 	github.com/lightningnetwork/lightning-onion v0.0.0-20190430041606-751fb4dd8b72
 	github.com/lightningnetwork/lnd/queue v1.0.1
 	github.com/lightningnetwork/lnd/ticker v1.0.0

go.sum

@@ -19,6 +19,8 @@ github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32 h1:qkOC5Gd33k54tobS3
 github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32/go.mod h1:DrZx5ec/dmnfpw9KyYoQyYo7d0KEvTkk/5M/vbZjAr8=
 github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c h1:aEbSeNALREWXk0G7UdNhR3ayBV7tZ4M2PNmnrCAph6Q=
 github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
+github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50 h1:4i3KsuVA0o0KoBxAC5x+MY7RbteiMK1V7gf/G08NGIQ=
+github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f h1:bAs4lUbRJpnnkd9VhRV3jjAVU7DJVjMaK+IsvSeZvFo=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
 github.com/btcsuite/btcutil v0.0.0-20180706230648-ab6388e0c60a/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
@@ -28,7 +30,6 @@ github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d h1:yJzD/yFppdVCf6
 github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
 github.com/btcsuite/btcwallet v0.0.0-20180904010540-284e2e0e696e33d5be388f7f3d9a26db703e0c06/go.mod h1:/d7QHZsfUAruXuBhyPITqoYOmJ+nq35qPsJjz/aSpCg=
 github.com/btcsuite/btcwallet v0.0.0-20190313032608-acf3b04b0273/go.mod h1:mkOYY8/psBiL5E+Wb0V7M0o+N7NXi2SZJz6+RKkncIc=
-github.com/btcsuite/btcwallet v0.0.0-20190319010515-89ab2044f962 h1:/6EtNbubaGgo10bFyYyE6S6yXfxtc3dxKpvLHxMt5rg=
 github.com/btcsuite/btcwallet v0.0.0-20190319010515-89ab2044f962/go.mod h1:qMi4jGpAO6YRsd81RYDG7o5pBIGqN9faCioJdagLu64=
 github.com/btcsuite/btcwallet v0.0.0-20190524003533-2c05240dff28 h1:jn9dKmISiudJAihPQ2XRQenffPkhQeoBh3SCiZSfFXE=
 github.com/btcsuite/btcwallet v0.0.0-20190524003533-2c05240dff28/go.mod h1:GlcKHrCBxtujd/6coLUvczN68EkaBezgyN+JnEGVDUY=
@@ -38,9 +39,11 @@ github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd h1:R/opQEbFEy9JG
 github.com/btcsuite/go-socks v0.0.0-20170105172521-4720035b7bfd/go.mod h1:HHNXQzUsZCxOoE+CPiyCTO6x34Zs86zZUiwtpXoGdtg=
 github.com/btcsuite/golangcrypto v0.0.0-20150304025918-53f62d9b43e8 h1:nOsAWScwueMVk/VLm/dvQQD7DuanyvAUb6B3P3eT274=
 github.com/btcsuite/golangcrypto v0.0.0-20150304025918-53f62d9b43e8/go.mod h1:tYvUd8KLhm/oXvUeSEs2VlLghFjQt9+ZaF9ghH0JNjc=
+github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd h1:qdGvebPBDuYDPGi1WCPjy1tGyMpmDK8IEapSsszn7HE=
 github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVaaLLH7j4eDXPRvw78tMflu7Ie2bzYOH4Y8rRKBY=
 github.com/btcsuite/goleveldb v1.0.0 h1:Tvd0BfvqX9o823q1j2UZ/epQo09eJh6dTcRp79ilIN4=
 github.com/btcsuite/goleveldb v1.0.0/go.mod h1:QiK9vBlgftBg6rWQIj6wFzbPfRjiykIEhBH4obrXJ/I=
+github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723 h1:ZA/jbKoGcVAnER6pCHPEkGdZOV7U1oLUedErBHCUMs0=
 github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
 github.com/btcsuite/snappy-go v1.0.0 h1:ZxaA6lo2EpxGddsA8JwWOcxlzRybb444sgmeJQMJGQE=
 github.com/btcsuite/snappy-go v1.0.0/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
@@ -107,12 +110,11 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lightninglabs/gozmq v0.0.0-20180324010646-462a8a753885 h1:fTLuPUkaKIIV0+gA1IxiBDvDxtF8tzpSF6N6NfFGmsU=
 github.com/lightninglabs/gozmq v0.0.0-20180324010646-462a8a753885/go.mod h1:KUh15naRlx/TmUMFS/p4JJrCrE6F7RGF7rsnvuu45E4=
 github.com/lightninglabs/neutrino v0.0.0-20181017011010-4d6069299130/go.mod h1:KJq43Fu9ceitbJsSXMILcT4mGDNI/crKmPIkDOZXFyM=
-github.com/lightninglabs/neutrino v0.0.0-20190213031021-ae4583a89cfb h1:Bwqgn9JXHo7I19lb4zTH2Xb0bfHgNuAJugQE7s00xqA=
 github.com/lightninglabs/neutrino v0.0.0-20190213031021-ae4583a89cfb/go.mod h1:g6cMQd+hfAU8pQTJAdjm6/EQREhupyd22f+CL0qYFOE=
 github.com/lightninglabs/neutrino v0.0.0-20190313035638-e1ad4c33fb18 h1:lxD7RgKYrjRRht6Cn1AiBPn4Rjgr5pkKSRxTs++EgaI=
 github.com/lightninglabs/neutrino v0.0.0-20190313035638-e1ad4c33fb18/go.mod h1:v6tz6jbuAubTrRpX8ke2KH9sJxml8KlPQTKgo9mAp1Q=
-github.com/lightninglabs/neutrino v0.0.0-20190521105038-03deaa76ddc2 h1:309vLN4dOi1CTqylpb8CsCWo1nT59rMrluZUF2228e0=
-github.com/lightninglabs/neutrino v0.0.0-20190521105038-03deaa76ddc2/go.mod h1:/XWY/6/btfsknUpLPV8vvIZyhod61zYaUJiE8HxsFUs=
+github.com/lightninglabs/neutrino v0.0.0-20190606084233-98b149cd0468 h1:ZNpidNxlh+KjLNvcqudStfNOjwQi/qqE7yJenyjThEA=
+github.com/lightninglabs/neutrino v0.0.0-20190606084233-98b149cd0468/go.mod h1:vzLU75ll8qbRJIzW5dvK/UXtR9c2FecJ6VNOM8chyVM=
 github.com/lightningnetwork/lightning-onion v0.0.0-20190430041606-751fb4dd8b72 h1:KgmypyQfJnEf2vhwboKCtTp4mHxIcLeXPBPWDbPuzFQ=
 github.com/lightningnetwork/lightning-onion v0.0.0-20190430041606-751fb4dd8b72/go.mod h1:Sooe/CoCqa85JxqHV+IBR2HW+6t2Cv+36awSmoccswM=
 github.com/ltcsuite/ltcd v0.0.0-20190101042124-f37f8bf35796 h1:sjOGyegMIhvgfq5oaue6Td+hxZuf3tDC8lAPrFldqFw=