allow to toggle features in backend

config/pre_release_features.json

@@ -1,6 +0,0 @@
-[
-    {
-        "label": "#1389",
-        "description": "Show markdown preview option in message input box"
-    }
-]

store/sql_preference_store.go

@@ -4,6 +4,7 @@
 package store
 
 import (
+	l4g "code.google.com/p/log4go"
 	"github.com/go-gorp/gorp"
 	"github.com/mattermost/platform/model"
 	"github.com/mattermost/platform/utils"
@@ -13,6 +14,10 @@ type SqlPreferenceStore struct {
 	*SqlStore
 }
 
+const (
+	FEATURE_TOGGLE_PREFIX = "feature_enabled_"
+)
+
 func NewSqlPreferenceStore(sqlStore *SqlStore) PreferenceStore {
 	s := &SqlPreferenceStore{sqlStore}
 
@@ -36,6 +41,23 @@ func (s SqlPreferenceStore) CreateIndexesIfNotExists() {
 	s.CreateIndexIfNotExists("idx_preferences_name", "Preferences", "Name")
 }
 
+func (s SqlPreferenceStore) DeleteUnusedFeatures() {
+	l4g.Debug("Deleting any unused pre-release features")
+
+	sql := `DELETE
+		FROM Preferences
+	WHERE
+	Category = :Category
+	AND Value = :Value
+	AND Name LIKE '` + FEATURE_TOGGLE_PREFIX + `%'`
+
+	queryParams := map[string]string{
+		"Category": "advanced_settings",
+		"Value":    "false",
+	}
+	s.GetMaster().Exec(sql, queryParams)
+}
+
 func (s SqlPreferenceStore) Save(preferences *model.Preferences) StoreChannel {
 	storeChannel := make(StoreChannel)
 
@@ -257,3 +279,28 @@ func (s SqlPreferenceStore) PermanentDeleteByUser(userId string) StoreChannel {
 
 	return storeChannel
 }
+
+func (s SqlPreferenceStore) FeatureToggle(feature, userId string) StoreChannel {
+	storeChannel := make(StoreChannel)
+
+	go func() {
+		result := StoreResult{}
+		if value, err := s.GetReplica().SelectStr(`SELECT
+				value
+			FROM
+				Preferences
+			WHERE
+				UserId = :UserId
+				AND Category = :Category
+				AND Name = :Name`, map[string]interface{}{"UserId": userId, "Category": "advanced_settings", "Name": FEATURE_TOGGLE_PREFIX + feature}); err != nil {
+			result.Err = model.NewAppError("SqlPreferenceStore.featureToggle", "We encountered an error while finding a pre release feature preference", err.Error())
+		} else {
+			result.Data = value == "true"
+		}
+
+		storeChannel <- result
+		close(storeChannel)
+	}()
+
+	return storeChannel
+}

store/sql_store.go

@@ -148,6 +148,8 @@ func NewSqlStore() Store {
 	sqlStore.webhook.(*SqlWebhookStore).CreateIndexesIfNotExists()
 	sqlStore.preference.(*SqlPreferenceStore).CreateIndexesIfNotExists()
 
+	sqlStore.preference.(*SqlPreferenceStore).DeleteUnusedFeatures()
+
 	if model.IsPreviousVersion(schemaVersion) || isSchemaVersion07 || isSchemaVersion10 {
 		sqlStore.system.Update(&model.System{Name: "Version", Value: model.CurrentVersion})
 		l4g.Warn("The database schema has been upgraded to version " + model.CurrentVersion)

store/store.go

@@ -186,4 +186,5 @@ type PreferenceStore interface {
 	GetCategory(userId string, category string) StoreChannel
 	GetAll(userId string) StoreChannel
 	PermanentDeleteByUser(userId string) StoreChannel
-}
+	FeatureToggle(feature, userId string) StoreChannel
+}

web/static/config/pre_release_features.json

@@ -1 +0,0 @@
-../../../config/pre_release_features.json

web/static/config/pre_release_features.json

@@ -0,0 +1,6 @@
+[
+    {
+        "label": "#1389",
+        "description": "Show markdown preview option in message input box"
+    }
+]