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lnrpc: wrap subservers in GrpcHandler

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In order to be able to register the subservers with the root grpc server
before we have all dependencies available, we wrap them in an
GrpcHandler struct. This struct will initially hold an empty reference
to the subservers, which allows us to register with the GRPC server, and
later populate and create the subserver instance.
This commit is contained in:
Johan T. Halseth
2021-01-29 15:49:48 +01:00
parent c623d21bd2
commit 4ea494e8c5
20 changed files with 341 additions and 106 deletions
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6
lnrpc/verrpc/driver.go
View File

@@ -9,10 +9,8 @@ import (
func init() {
subServer := &lnrpc.SubServerDriver{
SubServerName: subServerName,
New: func(c lnrpc.SubServerConfigDispatcher) (lnrpc.SubServer,
lnrpc.MacaroonPerms, error) {
return &Server{}, macPermissions, nil
NewGrpcHandler: func() lnrpc.GrpcHandler {
return &ServerShell{}
},
}

33
lnrpc/verrpc/server.go
View File

@@ -5,6 +5,7 @@ import (
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/lightningnetwork/lnd/build"
"github.com/lightningnetwork/lnd/lnrpc"
"google.golang.org/grpc"
"gopkg.in/macaroon-bakery.v2/bakery"
)
@@ -18,6 +19,13 @@ var macPermissions = map[string][]bakery.Op{
}},
}
// ServerShell is a shell struct holding a reference to the actual sub-server.
// It is used to register the gRPC sub-server with the root server before we
// have the necessary dependencies to populate the actual sub-server.
type ServerShell struct {
VersionerServer
}
// Server is an rpc server that supports querying for information about the
// running binary.
type Server struct{}
@@ -48,9 +56,9 @@ func (s *Server) Name() string {
// sub RPC server to register itself with the main gRPC root server. Until this
// is called, each sub-server won't be able to have requests routed towards it.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) RegisterWithRootServer(grpcServer *grpc.Server) error {
RegisterVersionerServer(grpcServer, s)
// NOTE: This is part of the lnrpc.GrpcHandler interface.
func (r *ServerShell) RegisterWithRootServer(grpcServer *grpc.Server) error {
RegisterVersionerServer(grpcServer, r)
log.Debugf("Versioner RPC server successfully registered with root " +
"gRPC server")
@@ -62,8 +70,8 @@ func (s *Server) RegisterWithRootServer(grpcServer *grpc.Server) error {
// RPC server to register itself with the main REST mux server. Until this is
// called, each sub-server won't be able to have requests routed towards it.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) RegisterWithRestServer(ctx context.Context,
// NOTE: This is part of the lnrpc.GrpcHandler interface.
func (r *ServerShell) RegisterWithRestServer(ctx context.Context,
mux *runtime.ServeMux, dest string, opts []grpc.DialOption) error {
// We make sure that we register it with the main REST server to ensure
@@ -80,6 +88,21 @@ func (s *Server) RegisterWithRestServer(ctx context.Context,
return nil
}
// CreateSubServer populates the subserver's dependencies using the passed
// SubServerConfigDispatcher. This method should fully initialize the
// sub-server instance, making it ready for action. It returns the macaroon
// permissions that the sub-server wishes to pass on to the root server for all
// methods routed towards it.
//
// NOTE: This is part of the lnrpc.GrpcHandler interface.
func (r *ServerShell) CreateSubServer(_ lnrpc.SubServerConfigDispatcher) (
lnrpc.SubServer, lnrpc.MacaroonPerms, error) {
subServer := &Server{}
r.VersionerServer = subServer
return subServer, macPermissions, nil
}
// GetVersion returns information about the compiled binary.
func (s *Server) GetVersion(_ context.Context,
_ *VersionRequest) (*Version, error) {