Update Type() to return an error

builtin/logical/database/backend.go

@@ -162,5 +162,5 @@ as secret backends, including but not limited to:
 cassandra, msslq, mysql, postgres
 
 After mounting this backend, configure it using the endpoints within
-the "database/dbs/" path.
+the "database/config/" path.
 `

builtin/logical/database/dbplugin/client.go

@@ -52,10 +52,11 @@ func newPluginClient(sys pluginutil.Wrapper, pluginRunner *pluginutil.PluginRunn
 		return nil, err
 	}
 
-	// We should have a Greeter now! This feels like a normal interface
+	// We should have a database type now. This feels like a normal interface
 	// implementation but is in fact over an RPC connection.
 	databaseRPC := raw.(*databasePluginRPCClient)
 
+	// Wrap RPC implimentation in DatabasePluginClient
 	return &DatabasePluginClient{
 		client:                  client,
 		databasePluginRPCClient: databaseRPC,
@@ -70,12 +71,11 @@ type databasePluginRPCClient struct {
 	client *rpc.Client
 }
 
-func (dr *databasePluginRPCClient) Type() string {
+func (dr *databasePluginRPCClient) Type() (string, error) {
 	var dbType string
-	//TODO: catch error
+	err := dr.client.Call("Plugin.Type", struct{}{}, &dbType)
-	dr.client.Call("Plugin.Type", struct{}{}, &dbType)
 
-	return fmt.Sprintf("plugin-%s", dbType)
+	return fmt.Sprintf("plugin-%s", dbType), err
 }
 
 func (dr *databasePluginRPCClient) CreateUser(statements Statements, usernamePrefix string, expiration time.Time) (username string, password string, err error) {

builtin/logical/database/dbplugin/databasemiddleware.go

@@ -18,7 +18,7 @@ type databaseTracingMiddleware struct {
 	typeStr string
 }
 
-func (mw *databaseTracingMiddleware) Type() string {
+func (mw *databaseTracingMiddleware) Type() (string, error) {
 	return mw.next.Type()
 }
 
@@ -87,7 +87,7 @@ type databaseMetricsMiddleware struct {
 	typeStr string
 }
 
-func (mw *databaseMetricsMiddleware) Type() string {
+func (mw *databaseMetricsMiddleware) Type() (string, error) {
 	return mw.next.Type()
 }
 

builtin/logical/database/dbplugin/plugin.go

@@ -2,6 +2,7 @@ package dbplugin
 
 import (
 	"errors"
+	"fmt"
 	"net/rpc"
 	"time"
 
@@ -16,7 +17,7 @@ var (
 
 // DatabaseType is the interface that all database objects must implement.
 type DatabaseType interface {
-	Type() string
+	Type() (string, error)
 	CreateUser(statements Statements, usernamePrefix string, expiration time.Time) (username string, password string, err error)
 	RenewUser(statements Statements, username string, expiration time.Time) error
 	RevokeUser(statements Statements, username string) error
@@ -52,16 +53,21 @@ func PluginFactory(pluginName string, sys pluginutil.LookWrapper, logger log.Log
 		return nil, err
 	}
 
+	typeStr, err := db.Type()
+	if err != nil {
+		return nil, fmt.Errorf("error getting plugin type: %s", err)
+	}
+
 	// Wrap with metrics middleware
 	db = &databaseMetricsMiddleware{
 		next:    db,
-		typeStr: db.Type(),
+		typeStr: typeStr,
 	}
 
 	// Wrap with tracing middleware
 	db = &databaseTracingMiddleware{
 		next:    db,
-		typeStr: db.Type(),
+		typeStr: typeStr,
 		logger:  logger,
 	}
 

builtin/logical/database/dbplugin/plugin_test.go

@@ -19,7 +19,7 @@ type mockPlugin struct {
 	users map[string][]string
 }
 
-func (m *mockPlugin) Type() string { return "mock" }
+func (m *mockPlugin) Type() (string, error) { return "mock", nil }
 func (m *mockPlugin) CreateUser(statements dbplugin.Statements, usernamePrefix string, expiration time.Time) (username string, password string, err error) {
 	err = errors.New("err")
 	if usernamePrefix == "" || expiration.IsZero() {
@@ -59,7 +59,7 @@ func (m *mockPlugin) RevokeUser(statements dbplugin.Statements, username string)
 	delete(m.users, username)
 	return nil
 }
-func (m *mockPlugin) Initialize(conf map[string]interface{}) error {
+func (m *mockPlugin) Initialize(conf map[string]interface{}, _ bool) error {
 	err := errors.New("err")
 	if len(conf) != 1 {
 		return err
@@ -108,7 +108,7 @@ func TestPlugin_Initialize(t *testing.T) {
 		"test": 1,
 	}
 
-	err = dbRaw.Initialize(connectionDetails)
+	err = dbRaw.Initialize(connectionDetails, true)
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
@@ -133,7 +133,7 @@ func TestPlugin_CreateUser(t *testing.T) {
 		"test": 1,
 	}
 
-	err = db.Initialize(connectionDetails)
+	err = db.Initialize(connectionDetails, true)
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
@@ -167,7 +167,7 @@ func TestPlugin_RenewUser(t *testing.T) {
 	connectionDetails := map[string]interface{}{
 		"test": 1,
 	}
-	err = db.Initialize(connectionDetails)
+	err = db.Initialize(connectionDetails, true)
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
@@ -196,7 +196,7 @@ func TestPlugin_RevokeUser(t *testing.T) {
 	connectionDetails := map[string]interface{}{
 		"test": 1,
 	}
-	err = db.Initialize(connectionDetails)
+	err = db.Initialize(connectionDetails, true)
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}

builtin/logical/database/dbplugin/server.go

@@ -42,8 +42,9 @@ type databasePluginRPCServer struct {
 }
 
 func (ds *databasePluginRPCServer) Type(_ struct{}, resp *string) error {
-	*resp = ds.impl.Type()
+	var err error
-	return nil
+	*resp, err = ds.impl.Type()
+	return err
 }
 
 func (ds *databasePluginRPCServer) CreateUser(args *CreateUserRequest, resp *CreateUserResponse) error {