Messaging: Rework mail fetcher to build client adhoc

Messaging/Mail/MailFetcher.vb

@@ -7,7 +7,7 @@ Imports Limilabs.Mail
 Namespace Mail
     Public Class MailFetcher
         Inherits BaseClass
-        Private ReadOnly MailSession As MailSession
+        Private MailSession As MailSession
         Private ReadOnly MailBuilder As New MailBuilder
 
         Public ReadOnly Property Connected2Server As Boolean
@@ -24,35 +24,50 @@ Namespace Mail
 
         Public Sub New(pLogConfig As LogConfig)
             MyBase.New(pLogConfig)
-            MailSession = New MailSession(pLogConfig, New Imap)
-
             Log.Enabled = pLogConfig.Debug
         End Sub
 
         Public Function Connect(pServer As String, pPort As Integer, pUser As String, pPassword As String, pAuthType As String) As MailSession.SessionInfo
+            MailSession = New MailSession(LogConfig, New Imap)
+
             Return MailSession.ConnectToServerWithBasicAuth(pServer, pPort, pUser, pPassword, pAuthType, New MailSession.MailSessionOptions)
         End Function
 
         Public Function ConnectToO365(pUser As String, pClientId As String, pTenantId As String, pClientSecret As String)
+            MailSession = New MailSession(LogConfig, New Imap)
+
             Dim oOptions = New MailSession.MailSessionOptions With {.EnableTls1_2 = True}
             Return MailSession.ConnectToServerWithO365OAuth(pUser, pClientId, pTenantId, pClientSecret, oOptions)
         End Function
 
         Public Function Connect(pServer As String, pPort As Integer, pUser As String, pPassword As String, pAuthType As String, pOptions As MailSession.MailSessionOptions) As MailSession.SessionInfo
+            MailSession = New MailSession(LogConfig, New Imap)
+
             Return MailSession.ConnectToServerWithBasicAuth(pServer, pPort, pUser, pPassword, pAuthType, pOptions)
         End Function
 
         Public Function Disconnect() As Boolean
+            If (MailSession.Session.Connected = False) Then
+                Return True
+            End If
+
             Return MailSession.DisconnectFromServer()
         End Function
 
-        Public Async Function FetchAllMails() As Task(Of List(Of IMail))
+        Public Async Function FetchAllMailsAsync() As Task(Of List(Of IMail))
             Return Await FetchMailsAsync(Flag.All)
         End Function
 
-        Public Async Function FetchUnreadMails() As Task(Of List(Of IMail))
+        Public Async Function FetchUnreadMailsAsync() As Task(Of List(Of IMail))
             Return Await FetchMailsAsync(Flag.Unseen)
         End Function
+        Public Function FetchAllMails() As List(Of IMail)
+            Return FetchMails(Flag.All)
+        End Function
+
+        Public Function FetchUnreadMails() As List(Of IMail)
+            Return FetchMails(Flag.Unseen)
+        End Function
 
         Public Function ListAllMails() As List(Of Long)
             Return ListMails(Flag.All)
@@ -62,18 +77,54 @@ Namespace Mail
             Return ListMails(Flag.Unseen)
         End Function
 
+        Public Function FetchMails(pMailFlag As Flag) As List(Of IMail)
+            Try
+                If MailSession.Session.Connected Then
+                    Dim oMailIds = ListMails(pMailFlag)
+                    Dim oMails As New List(Of IMail)
+
+                    For Each oId In oMailIds
+
+                        Dim oMail As IMail = FetchMail(oId)
+                        oMails.Add(oMail)
+
+                    Next
+
+                    Return oMails
+                Else
+                    Logger.Error("No connection to Server. Exiting.")
+                    Return Nothing
+                End If
+            Catch ex As Exception
+                Logger.Error(ex)
+                Return Nothing
+            End Try
+
+        End Function
+
         Public Async Function FetchMailsAsync(pMailFlag As Flag) As Task(Of List(Of IMail))
-            Dim oMailIds = ListMails(pMailFlag)
-            Dim oMails As New List(Of IMail)
+            Try
+                If MailSession.Session.Connected Then
+                    Dim oMailIds = ListMails(pMailFlag)
+                    Dim oMails As New List(Of IMail)
 
-            For Each oId In oMailIds
+                    For Each oId In oMailIds
 
-                Dim oMail As IMail = Await FetchMailAsync(oId)
-                oMails.Add(oMail)
+                        Dim oMail As IMail = Await FetchMailAsync(oId)
+                        oMails.Add(oMail)
 
-            Next
+                    Next
+
+                    Return oMails
+                Else
+                    Logger.Error("No connection to Server. Exiting.")
+                    Return Nothing
+                End If
+            Catch ex As Exception
+                Logger.Error(ex)
+                Return Nothing
+            End Try
 
-            Return oMails
         End Function
 
         Public Function ListMails(pMailFlag As Flag) As List(Of Long)