B4J Code Snippet [PyBridge][Server] PyBridge with standard handlers

The previous tutorial: https://www.b4x.com/android/forum/threads/pybridge-server-using-pybridge-in-web-apps.166154/#content explains how to use PyBridge within a server solution. The tutorial is based on WebSocket handlers. Calling PyBridge from standard handlers is quite similar, but requires starting and stopping a message loop.

The important code is:

Sub Handle(req As ServletRequest, resp As ServletResponse)
    Dim code As String = req.GetParameter("code")
    SendAndWait(code, resp) 'must be a separate sub
    StartMessageLoop
End Sub

Private Sub SendAndWait (code As String, resp As ServletResponse)
    CallSubDelayed3(Main.PyWorker, "Run_Eval", Me, code)
    Wait For Run_Eval (Result As PyWrapper)
    resp.ContentType = "text/html"
    resp.Write("Code: " & code)
    resp.Write("<br/>")
    If Result.IsSuccess Then
        resp.Write("Success: " & Result.Value)
    Else
        resp.Write("Error: " & Result.ErrorMessage)
    End If
    StopMessageLoop
End Sub

The handler expects a "code" parameter that is evaluated and the result is returned. Never evaluate user input in non-trusted environments (internet for example) as it will lead to execution of malicious code on the server.

 

[ilan]

thank you so much Erel. You are the best!