Add multiplexing support (#74)

* Add multiplexing support

* use NewWithMultiplex constructor

* revert to using New constructor; remove NewWithMultiplex

* point to pseudo tag in vault repo

* update to v0.4.0 vault sdk

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-retryablehttp v0.7.0 // indirect
 	github.com/hashicorp/vault/api v1.3.0
-	github.com/hashicorp/vault/sdk v0.3.0
+	github.com/hashicorp/vault/sdk v0.4.0
 	github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/lib/pq v1.1.1 // indirect

go.sum

@@ -301,8 +301,9 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/hashicorp/vault/api v1.3.0 h1:uDy39PLSvy6gtKyjOCRPizy2QdFiIYSWBR2pxCEzYL8=
 github.com/hashicorp/vault/api v1.3.0/go.mod h1:EabNQLI0VWbWoGlA+oBLC8PXmR9D60aUVgQGvangFWQ=
-github.com/hashicorp/vault/sdk v0.3.0 h1:kR3dpxNkhh/wr6ycaJYqp6AFT/i2xaftbfnwZduTKEY=
 github.com/hashicorp/vault/sdk v0.3.0/go.mod h1:aZ3fNuL5VNydQk8GcLJ2TV8YCRVvyaakYkhZRoVuhj0=
+github.com/hashicorp/vault/sdk v0.4.0 h1:r60AsH84FZOPKJWP0OyS/chxcD98lKa/FN0VSJhSLWc=
+github.com/hashicorp/vault/sdk v0.4.0/go.mod h1:aZ3fNuL5VNydQk8GcLJ2TV8YCRVvyaakYkhZRoVuhj0=
 github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb/go.mod h1:+NfK9FKeTrX5uv1uIXGdwYDTeHna2qgaIlx54MXqjAM=
 github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d h1:kJCB4vdITiW1eC1vq2e6IsrXKrZit1bv/TDYFGMp4BQ=
 github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d/go.mod h1:+NfK9FKeTrX5uv1uIXGdwYDTeHna2qgaIlx54MXqjAM=

plugin/main.go

@@ -23,12 +23,7 @@ func main() {
 
 // Run instantiates an Oracle object, and runs the RPC server for the plugin
 func Run() error {
-	db, err := plugin.New()
-	if err != nil {
-		return err
-	}
-
-	dbplugin.Serve(db.(dbplugin.Database))
+	dbplugin.ServeMultiplex(plugin.New)
 
 	return nil
 }