Allow reading of config in sql backends

builtin/logical/postgresql/backend_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"reflect"
 	"testing"
 
 	"github.com/hashicorp/vault/logical"
@@ -13,6 +14,48 @@ import (
 	"github.com/mitchellh/mapstructure"
 )
 
+func TestBackend_config_connection(t *testing.T) {
+	var resp *logical.Response
+	var err error
+	config := logical.TestBackendConfig()
+	config.StorageView = &logical.InmemStorage{}
+	b, err := Factory(config)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	configData := map[string]interface{}{
+		"connection_url":       "sample_connection_url",
+		"max_open_connections": 9,
+		"max_idle_connections": 7,
+		"verify_connection":    false,
+	}
+
+	configReq := &logical.Request{
+		Operation: logical.UpdateOperation,
+		Path:      "config/connection",
+		Storage:   config.StorageView,
+		Data:      configData,
+	}
+	resp, err = b.HandleRequest(configReq)
+	if err != nil || (resp != nil && resp.IsError()) {
+		t.Fatalf("err:%s resp:%#v\n", err, resp)
+	}
+	if resp != nil {
+		t.Fatalf("expected a nil response")
+	}
+
+	configReq.Operation = logical.ReadOperation
+	resp, err = b.HandleRequest(configReq)
+	if err != nil || (resp != nil && resp.IsError()) {
+		t.Fatalf("err:%s resp:%#v\n", err, resp)
+	}
+
+	if !reflect.DeepEqual(configData, resp.Data) {
+		t.Fatalf("bad: expected:%#v\nactual:%#v\n", configData, resp.Data)
+	}
+}
+
 func TestBackend_basic(t *testing.T) {
 	b, _ := Factory(logical.TestBackendConfig())