Bug fixing

+ DB access is now right and uses copied sessions
+ DB session is now specifying the safe state and the mode
+ Fixed the issue with too early ICCC messages regarding to late cache
+ Add the MIME type for Dart
+ Fixed the issuse with wrong order of shutdown handlers
- TODO: Testing of these changes

CustomerDB/AccessDB.go

@@ -5,15 +5,22 @@ import "labix.org/v2/mgo"
 /*
 Get the database instance of the MGo Mongo driver.
 */
-func DB() (result *mgo.Database) {
-	result = db
+func DB() (session *mgo.Session, database *mgo.Database) {
+	session = mainSession.Copy()
+	database = session.DB(databaseDB)
+	database.Login(databaseUsername, databasePassword)
+
 	return
 }
 
 /*
 Get directly the GridFS instance of the Mgo Mongo driver.
 */
-func GridFS() (result *mgo.GridFS) {
-	result = gridFS
+func GridFS() (session *mgo.Session, filesystem *mgo.GridFS) {
+	session = mainSession.Copy()
+	database := session.DB(databaseDB)
+	database.Login(databaseUsername, databasePassword)
+	filesystem = database.GridFS(`fs`)
+
 	return
 }

CustomerDB/Init.go

@@ -10,20 +10,20 @@ func init() {
 	Log.LogShort(senderName, LM.CategorySYSTEM, LM.LevelINFO, LM.MessageNameDATABASE, `Init the customer database.`)
 
 	databaseHost := ConfigurationDB.Read(`CustomerDBHost`)
-	databaseDB := ConfigurationDB.Read(`CustomerDBDatabase`)
-	databaseUsername := ConfigurationDB.Read(`CustomerDBUsername`)
-	databasePassword := ConfigurationDB.Read(`CustomerDBPassword`)
+	databaseDB = ConfigurationDB.Read(`CustomerDBDatabase`)
+	databaseUsername = ConfigurationDB.Read(`CustomerDBUsername`)
+	databasePassword = ConfigurationDB.Read(`CustomerDBPassword`)
 
 	// Connect to MongoDB:
 	if newSession, errDial := mgo.Dial(databaseHost); errDial != nil {
 		Log.LogFull(senderName, LM.CategorySYSTEM, LM.LevelERROR, LM.SeverityUnknown, LM.ImpactUnknown, LM.MessageNameDATABASE, `It was not possible to connect to the MongoDB host `+databaseHost, errDial.Error())
 		return
 	} else {
-		session = newSession
+		mainSession = newSession
 	}
 
 	// Use the correct database:
-	db = session.DB(databaseDB)
+	db := mainSession.DB(databaseDB)
 	if db == nil {
 		Log.LogFull(senderName, LM.CategorySYSTEM, LM.LevelERROR, LM.SeverityCritical, LM.ImpactCritical, LM.MessageNameDATABASE, `Was not able to get the customer database.`)
 		return
@@ -35,8 +35,15 @@ func init() {
 		return
 	}
 
+	// In case of write operations, wait for the majority of servers to be done:
+	mainSession.SetSafe(&mgo.Safe{WMode: "majority"})
+
+	// Set the consistency mode to read from any secondary server and write to the primary.
+	// Copied sessions can overwrite this setting of necessary.
+	mainSession.SetMode(mgo.Eventual, true)
+
 	// Get the GridFS:
-	gridFS = db.GridFS(`fs`)
+	gridFS := db.GridFS(`fs`)
 	if gridFS == nil {
 		Log.LogFull(senderName, LM.CategorySYSTEM, LM.LevelERROR, LM.SeverityCritical, LM.ImpactCritical, LM.MessageNameDATABASE, `Was not able to get the GridFS from the database.`)
 		return

CustomerDB/Shutdown.go

@@ -14,6 +14,4 @@ This function is called if the Ocean server is shutting down.
 */
 func (a ShutdownFunction) Shutdown() {
 	Log.LogShort(senderName, LM.CategoryAPP, LM.LevelWARN, LM.MessageNameSHUTDOWN, `Close now the customer database connection.`)
-	db.Logout()
-	session.Close()
 }

CustomerDB/Variables.go

@@ -4,8 +4,9 @@ import "labix.org/v2/mgo"
 import LM "github.com/SommerEngineering/Ocean/Log/Meta"
 
 var (
-	session    *mgo.Session  = nil
-	db         *mgo.Database = nil
-	gridFS     *mgo.GridFS   = nil
-	senderName LM.Sender     = `System::CustomerDB`
+	mainSession      *mgo.Session = nil
+	senderName       LM.Sender    = `System::CustomerDB`
+	databaseUsername string       = ``
+	databasePassword string       = ``
+	databaseDB       string       = ``
 )