4ea494e8c5
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.
70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
// +build chainrpc
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package chainrpc
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import (
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"fmt"
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"github.com/lightningnetwork/lnd/lnrpc"
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)
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// createNewSubServer is a helper method that will create the new chain notifier
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// sub server given the main config dispatcher method. If we're unable to find
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// the config that is meant for us in the config dispatcher, then we'll exit
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// with an error.
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func createNewSubServer(configRegistry lnrpc.SubServerConfigDispatcher) (
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*Server, lnrpc.MacaroonPerms, error) {
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// We'll attempt to look up the config that we expect, according to our
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// subServerName name. If we can't find this, then we'll exit with an
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// error, as we're unable to properly initialize ourselves without this
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// config.
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chainNotifierServerConf, ok := configRegistry.FetchConfig(subServerName)
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if !ok {
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return nil, nil, fmt.Errorf("unable to find config for "+
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"subserver type %s", subServerName)
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}
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// Now that we've found an object mapping to our service name, we'll
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// ensure that it's the type we need.
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config, ok := chainNotifierServerConf.(*Config)
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if !ok {
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return nil, nil, fmt.Errorf("wrong type of config for "+
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"subserver %s, expected %T got %T", subServerName,
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&Config{}, chainNotifierServerConf)
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}
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// Before we try to make the new chain notifier service instance, we'll
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// perform some sanity checks on the arguments to ensure that they're
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// usable.
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switch {
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// If the macaroon service is set (we should use macaroons), then
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// ensure that we know where to look for them, or create them if not
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// found.
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case config.MacService != nil && config.NetworkDir == "":
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return nil, nil, fmt.Errorf("NetworkDir must be set to create " +
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"chainrpc")
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case config.ChainNotifier == nil:
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return nil, nil, fmt.Errorf("ChainNotifier must be set to " +
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"create chainrpc")
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}
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return New(config)
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}
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func init() {
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subServer := &lnrpc.SubServerDriver{
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SubServerName: subServerName,
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NewGrpcHandler: func() lnrpc.GrpcHandler {
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return &ServerShell{}
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},
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}
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// If the build tag is active, then we'll register ourselves as a
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// sub-RPC server within the global lnrpc package namespace.
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if err := lnrpc.RegisterSubServer(subServer); err != nil {
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panic(fmt.Sprintf("failed to register subserver driver %s: %v",
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subServerName, err))
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}
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}
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