Improved ICCC

It is now necessary, that every command sends an answer.

System/ICCCStart.go

@@ -1,6 +1,7 @@
 package System
 
 import (
+	"fmt"
 	"github.com/SommerEngineering/Ocean/ICCC"
 	"github.com/SommerEngineering/Ocean/ICCC/SystemMessages"
 	"github.com/SommerEngineering/Ocean/Log"
@@ -8,14 +9,36 @@ import (
 )
 
 // The receiver function for the ICCC message, that a server is up and running.
-func icccSystemStart(data map[string][]string) {
+func icccSystemStart(data map[string][]string) (result map[string][]string) {
+
+	// Recover from errors:
+	defer func() {
+		if err := recover(); err != nil {
+			Log.LogFull(senderName, LM.CategorySYSTEM, LM.LevelERROR, LM.SeverityUnknown, LM.ImpactUnknown, LM.MessageNamePARSE, fmt.Sprintf("Was not able to execute the ICCC server startup message. %s", err))
+			result = make(map[string][]string, 0)
+			return
+		}
+	}()
 
 	// Converts the HTTP form data into an object:
-	_, _, obj := ICCC.Data2Message(&SystemMessages.ICCCStartUpMessage{}, data)
+	_, _, obj := ICCC.Data2Message(SystemMessages.ICCCStartUpMessage{}, data)
 
-	// Cast the object to the right type:
-	messageData := obj.(*SystemMessages.ICCCStartUpMessage)
+	// Was it possible to convert the data?
+	if obj != nil {
+		// Cast the object to the right type:
+		messageData := obj.(SystemMessages.ICCCStartUpMessage)
 
-	// Provide a log entry:
-	Log.LogShort(senderName, LM.CategorySYSTEM, LM.LevelINFO, LM.MessageNameSTARTUP, `ICCC message: The server is now up and ready.`, messageData.PublicIPAddressAndPort, messageData.AdminIPAddressAndPort)
+		// Provide a log entry:
+		Log.LogShort(senderName, LM.CategorySYSTEM, LM.LevelINFO, LM.MessageNameSTARTUP, `ICCC message: The server is now up and ready.`, messageData.PublicIPAddressAndPort, messageData.AdminIPAddressAndPort)
+
+		// An answer is necessary:
+		return ICCC.Message2Data("", "", SystemMessages.AnswerACK)
+	} else {
+		Log.LogShort(senderName, LM.CategorySYSTEM, LM.LevelINFO, LM.MessageNameSTARTUP, `ICCC message: Was not able to create the message.`)
+		fmt.Println(`[Error] ICCC message: Was not able to create the message.`)
+	}
+
+	// In any other error case:
+	result = make(map[string][]string, 0)
+	return
 }