check whether file already exists and correctly receive it

LaunchScript/VirtualAcousticsStarterServer.py

@@ -158,9 +158,23 @@ try:
                     ProjectName = aMessageParts[3]
                     Fullpath = os.path.join(sCurrentScriptsDirectory, "..", "tmp", ProjectName, Path, "")
                     print("Should receive file: "+Filename+" in path "+Fullpath+ " with "+str(iBytesToReceive)+" bytes")
+
+                    #check whether the file with this exact size already exists
+                    if os.path.isfile(Fullpath+Filename) and os.stat(Fullpath+Filename).st_size==iBytesToReceive:
+                      oConnection.send( b'exists' )
+                      print("File already exists with this size, so no need for resending")
+
+                    else: #file need to be received
+                      #create dir if it does not exist
                       if not os.path.exists(Fullpath):
                         os.makedirs(Fullpath)
-                    oConnection.send( b'a' ) #send acceptance
+
+                      #send acceptance
+                      oConnection.send( b'ack' ) 
+                      #print("Send ack")
+
+                      #receive file
+                      iBytesReceived = 0
                       with open(Fullpath+Filename, "wb") as f:
                         bReceivingFile = True
                         while bReceivingFile:
@@ -174,12 +188,21 @@ try:
                           else:
                             # write to the file the bytes we just received
                             f.write(bytes_read)
-                    print("File received")
+                            iBytesReceived += len(bytes_read)
+                          if iBytesReceived == iBytesToReceive:
+                            bReceivingFile = False
+                        f.close()
+
+                      #check whether received file seems ok  
+                      if iBytesReceived == iBytesToReceive:
+                        oConnection.send( b'ack' ) #send acceptance
+                        print("File received successfully")
                       else:
-                    print( "Received message: "+sResult.decode("utf-8"))
-                    print( "First byte: "+str(sResult[0]))
-                  #print( "Received quit event" )
-                  #bContinue = False
+                        oConnection.send( b'fail' ) #send failure
+                        print("File receive failed")
+                  else: #NOT sMessage.startswith("file")      
+                    print( "Received quit event: "+sMessage )
+                    bContinue = False
                     
               except socket.timeout:
                 bContinue = True # timeouts are okay