multi: remove static default channel types instead select them based on lnd's verison

cmd/pool/order.go

@@ -115,10 +115,6 @@ var sharedFlags = []cli.Flag{
 			"order being matched (%q, %q)",
 			channelTypePeerDependent,
 			channelTypeScriptEnforced),
-		// TODO: Switch to script enforcement by default once we can
-		// enforce the lnd release supporting script enforced channels
-		// as the minimalCompatibleVersion.
-		Value: channelTypePeerDependent,
 	},
 }
 
@@ -248,6 +244,8 @@ func parseCommonParams(ctx *cli.Context, blockDuration uint32) (*poolrpc.Order,
 	// order match.
 	channelType := ctx.String("channel_type")
 	switch channelType {
+	// No values means that the unknown type will be set, which means the
+	// sever will select a type based on the version of the connected node.
 	case "":
 		break
 	case channelTypePeerDependent:

go.mod

@@ -14,7 +14,7 @@ require (
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.5.0
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/lightninglabs/aperture v0.1.6-beta
-	github.com/lightninglabs/lndclient v0.14.0-5
+	github.com/lightninglabs/lndclient v0.14.0-7
 	github.com/lightninglabs/pool/auctioneerrpc v1.0.5
 	github.com/lightninglabs/protobuf-hex-display v1.4.3-hex-display
 	github.com/lightningnetwork/lnd v0.14.1-beta

go.sum

@@ -461,8 +461,8 @@ github.com/lightninglabs/aperture v0.1.6-beta/go.mod h1:9xl4mx778ZAzrB87nLHMqk+X
 github.com/lightninglabs/gozmq v0.0.0-20191113021534-d20a764486bf h1:HZKvJUHlcXI/f/O0Avg7t8sqkPo78HFzjmeYFl6DPnc=
 github.com/lightninglabs/gozmq v0.0.0-20191113021534-d20a764486bf/go.mod h1:vxmQPeIQxPf6Jf9rM8R+B4rKBqLA2AjttNxkFBL2Plk=
 github.com/lightninglabs/lndclient v0.11.0-4/go.mod h1:8/cTKNwgL87NX123gmlv3Xh6p1a7pvzu+40Un3PhHiI=
-github.com/lightninglabs/lndclient v0.14.0-5 h1:dI2/Y2fn9m5VuwMTd/DcF6y0DYdMy3pk0MPu4xNjj54=
-github.com/lightninglabs/lndclient v0.14.0-5/go.mod h1:2kH9vNoc29ghIkfMjxwSeK8yCxsYfR80XAJ9PU/QWWk=
+github.com/lightninglabs/lndclient v0.14.0-7 h1:muqPju9ixBtQNcO0SkvbZ2b2oORUMRqQ4e+aC077Qa8=
+github.com/lightninglabs/lndclient v0.14.0-7/go.mod h1:2kH9vNoc29ghIkfMjxwSeK8yCxsYfR80XAJ9PU/QWWk=
 github.com/lightninglabs/neutrino v0.11.0/go.mod h1:CuhF0iuzg9Sp2HO6ZgXgayviFTn1QHdSTJlMncK80wg=
 github.com/lightninglabs/neutrino v0.11.1-0.20200316235139-bffc52e8f200/go.mod h1:MlZmoKa7CJP3eR1s5yB7Rm5aSyadpKkxqAwLQmog7N0=
 github.com/lightninglabs/neutrino v0.12.1/go.mod h1:GlKninWpRBbL7b8G0oQ36/8downfnFwKsr0hbRA6E/E=

order/rpc_parse.go

@@ -19,10 +19,41 @@ import (
 	"github.com/lightningnetwork/lnd/tor"
 )
 
+// OrderParseOption defines a set of functional param options that can be used
+// to modify our we parse orders based on some optional directives.
+type OrderParseOption func(*parseOptions)
+
+// parseOptions houses the set of functional options used to parse RPC orders.
+type parseOptions struct {
+	chanTypeSelector func() ChannelType
+}
+
+// ChanTypeSelector defines a function capable of selecting a channel type
+// based on the version of an lnd node.
+type ChanTypeSelector func() ChannelType
+
+// WithDefaultChannelType allows a caller to select a default channel type
+// based on the version of the lnd node attempting to create the order.
+func WithDefaultChannelType(selector ChanTypeSelector) OrderParseOption {
+	return func(o *parseOptions) {
+		o.chanTypeSelector = selector
+	}
+}
+
+// defaultParseOptions returns the set of default parse options.
+func defaultParseOptions() *parseOptions {
+	return &parseOptions{}
+}
+
 // ParseRPCOrder parses the incoming raw RPC order into the go native data
 // types used in the order struct.
 func ParseRPCOrder(version, leaseDuration uint32,
-	details *poolrpc.Order) (*Kit, error) {
+	details *poolrpc.Order, parseOpts ...OrderParseOption) (*Kit, error) {
+
+	opts := defaultParseOptions()
+	for _, newOpt := range parseOpts {
+		newOpt(opts)
+	}
 
 	var nonce Nonce
 	copy(nonce[:], details.OrderNonce)
@@ -65,10 +96,13 @@ func ParseRPCOrder(version, leaseDuration uint32,
 	switch details.ChannelType {
 	// Default value, trader didn't specify a channel type.
 	case auctioneerrpc.OrderChannelType_ORDER_CHANNEL_TYPE_UNKNOWN:
-		// TODO: Switch to script enforcement by default once we can
-		// enforce the lnd release supporting script enforced channels
-		// as the minimalCompatibleVersion.
-		kit.ChannelType = ChannelTypePeerDependent
+		// If we have a chan type selector, we'll use that, otherwise
+		// we'll just use peer dependent channels as as default.
+		if opts.chanTypeSelector != nil {
+			kit.ChannelType = opts.chanTypeSelector()
+		} else {
+			kit.ChannelType = ChannelTypePeerDependent
+		}
 
 	case auctioneerrpc.OrderChannelType_ORDER_CHANNEL_TYPE_PEER_DEPENDENT:
 		kit.ChannelType = ChannelTypePeerDependent

rpcserver.go

@@ -1191,12 +1191,30 @@ func prepareAndSubmitOrder(ctx context.Context, o order.Order,
 func (s *rpcServer) SubmitOrder(ctx context.Context,
 	req *poolrpc.SubmitOrderRequest) (*poolrpc.SubmitOrderResponse, error) {
 
+	// We'll use this channel type selector to pick a channel type based on
+	// the current connected lnd version. This lets us graceful update to
+	// new features as they're available, while still supporting older
+	// versions of lnd.
+	chanTypeSelector := order.WithDefaultChannelType(func() order.ChannelType {
+		// If they didn't specify a value, then we'll select one based
+		// on the version of lnd we detect.
+		verErr := lndclient.AssertVersionCompatible(
+			s.server.lndVersion, scriptEnforceVersion,
+		)
+		if verErr == nil {
+			return order.ChannelTypeScriptEnforced
+		}
+
+		return order.ChannelTypePeerDependent
+	})
+
 	var o order.Order
 	switch requestOrder := req.Details.(type) {
 	case *poolrpc.SubmitOrderRequest_Ask:
 		a := requestOrder.Ask
 		kit, err := order.ParseRPCOrder(
 			a.Version, a.LeaseDurationBlocks, a.Details,
+			chanTypeSelector,
 		)
 		if err != nil {
 			return nil, err
@@ -1210,6 +1228,7 @@ func (s *rpcServer) SubmitOrder(ctx context.Context,
 		b := requestOrder.Bid
 		kit, err := order.ParseRPCOrder(
 			b.Version, b.LeaseDurationBlocks, b.Details,
+			chanTypeSelector,
 		)
 		if err != nil {
 			return nil, err

server.go

@@ -52,6 +52,18 @@ var (
 			"signrpc", "walletrpc", "chainrpc", "invoicesrpc",
 		},
 	}
+
+	// scriptEnforceVersion is the version of lnd that enabled lease duration script
+	// enforcement as a new channel type. We'll use this to decide what
+	// order type to default to.
+	scriptEnforceVersion = &verrpc.Version{
+		AppMajor: 0,
+		AppMinor: 14,
+		AppPatch: 0,
+		BuildTags: []string{
+			"signrpc", "walletrpc", "chainrpc", "invoicesrpc",
+		},
+	}
 )
 
 // Server is the main poold trader server.
@@ -71,6 +83,8 @@ type Server struct {
 	// client or an error if none has been established yet.
 	GetIdentity func() (*lsat.TokenID, error)
 
+	lndVersion *verrpc.Version
+
 	cfg             *Config
 	db              *clientdb.DB
 	fundingManager  *funding.Manager
@@ -128,6 +142,11 @@ func (s *Server) Start() error {
 		return nil
 	}
 
+	// Now that we have lnd, lets extract the current version so we can use
+	// this to gate features that we'll use based on the functionality
+	// available.
+	s.lndVersion = s.lndServices.Version
+
 	// As there're some other lower-level operations we may need access to,
 	// we'll also make a connection for a "basic client".
 	//