[VB6] How to reduce SFTP Connection Rate
To whom it may concern
I was develop simple Function for Connect SFTP Server and Put File via VB6. Also, I was confirm that my code works fine.
After a few months, I receive E-mail from my clients that said too many SFTP connection were encountered.
Their request is below :
Polling of Directories and File Transfer Rate
- SFTP Users may not poll their directories more than once per minute.
- Maximum number of file transfers per account per hour not to exceed 300.(They told to me that Our Connection per hour is 800.)
My Function is called by Program 4 times per every day. So It is impossible that Our Connection per hour is almost 800. But It is happend.
Unfortunately, I couldn't find the cause of the Problem from My Function.
I would be grateful if you could check my Code and Find the problem if you could.
Here is my CODE below :
The dubious part that I think is ' Dissconnect, Clean Up Section. In my opinion, session.Close should be added before session.dispose.
But I confused Because I don't know about difference between session.close and session.dispose.
Sincerely.
I was develop simple Function for Connect SFTP Server and Put File via VB6. Also, I was confirm that my code works fine.
After a few months, I receive E-mail from my clients that said too many SFTP connection were encountered.
Their request is below :
Polling of Directories and File Transfer Rate
- SFTP Users may not poll their directories more than once per minute.
- Maximum number of file transfers per account per hour not to exceed 300.(They told to me that Our Connection per hour is 800.)
My Function is called by Program 4 times per every day. So It is impossible that Our Connection per hour is almost 800. But It is happend.
Unfortunately, I couldn't find the cause of the Problem from My Function.
I would be grateful if you could check my Code and Find the problem if you could.
Here is my CODE below :
Public Function SendSFTP_By_WINSCP(Addr As String, _
Uid As String, _
Attach As String, _
FileName As String, _
HostKey As String, _
sPPK As String, _
Optional Pwd As String = "", _
Optional remotePath As String = "", _
Optional mkdirDirectory As String = "") As Boolean
On Error GoTo err
' Connection Option
Dim session
Dim sessionOptions
Set session = New session
Set sessionOptions = CreateObject("WinSCP.SessionOptions")
Dim myTransferOptions As New TransferOptions
If sPPK <> "" Then
With sessionOptions
.SshPrivateKeyPath = App.path & "\SSH_PPK\" & sPPK
.PortNumber = 22
.Protocol = Protocol_Sftp
.HostName = Addr
.UserName = Uid
.SshHostKeyFingerprint = HostKey
End With
ElseIf Pwd <> "" Then
With sessionOptions
.PortNumber = 22
.Protocol = Protocol_Sftp
.HostName = Addr
.UserName = Uid
.Password = Pwd
.SshHostKeyFingerprint = HostKey
End With
Else
GoTo err
End If
' Binary Mode로 고정
myTransferOptions.TransferMode = TransferMode_Binary
' Connect
session.DisableVersionCheck = True
session.Open (sessionOptions)
If mkdirDirectory <> "" Then
If (session.FileExists(mkdirDirectory) = False) Then
session.CreateDirectory (mkdirDirectory)
End If
End If
' UpLoad File
Dim transferResult As TransferOperationResult
Set transferResult = session.PutFiles(Attach, remotePath & FileName, False, myTransferOptions)
' Throw on Any Error
If transferResult.check Then
SendSFTP_By_WINSCP = False
Else
SendSFTP_By_WINSCP = True
End If
' Dissconnect, Clean Up
session.dispose
Set sessionOptions = Nothing
Set session = Nothing
Exit Function
err:
' Exception Error
SendSFTP_By_WINSCP = False
session.dispose
Set sessionOptions = Nothing
Set session = Nothing
End FunctionThe dubious part that I think is ' Dissconnect, Clean Up Section. In my opinion, session.Close should be added before session.dispose.
But I confused Because I don't know about difference between session.close and session.dispose.
Sincerely.
