Prepare support for shared libraries

gui.py

@@ -17,6 +17,7 @@ import re
 import logging
 import optparse
 import time
+from ctypes import CDLL
 
 log = logging.getLogger(__name__)
 terminal_formatter = logging.Formatter(
@@ -131,6 +132,8 @@ def gui():
                       help='Display debug information')
     parser.add_option('--udp', dest='udp', metavar='RemoteIP:inPort:outPort',
                       help='Use UDP sockets instead of message queues')
+    parser.add_option('-l', '--shared_lib', action='store_true', default=False,
+                      help='Use a shared library instead of msgQ or UDP')
     parser.add_option('-r', '--reset', action='store_true', default=False,
                       help='Do not try to restore windows layout')
     parser.add_option('-i', '--ivpath', dest='ivpath',
@@ -151,10 +154,18 @@ def gui():
         log.error('You entered ' + options.udp)
         sys.exit(-1)
 
+    try:
+        import datamodel
+    except ImportError:
+        log.error('Could not import project data')
+        return -1
+
     msgQ = True
     udp = None
+    dll = None
     hasTM = False
-    if options.udp is None:
+    if options.udp is None and options.shared_lib is None:
+        # Default: use message queue
         try:
             from PythonController import(OpenMsgQueueForReading,
                         GetMsgQueueBufferSize, DV, RetrieveMessageFromQueue)
@@ -162,7 +173,7 @@ def gui():
         except ImportError:
             log.error('Python module "PythonController" is missing')
             return -1
-    else:
+    elif options.udp:
         msgQ = False
         udpConfig = options.udp.split(':')
         log.debug('UDP with IP={cfg[0]} inPort={cfg[1]} outPort={cfg[2]}'
@@ -175,12 +186,16 @@ def gui():
         except ImportError:
             log.error('Python module "udpcontroller" is missing')
             return -1
-
-    try:
-        import datamodel
-    except ImportError:
-        log.error('Could not import user-defined datamodel')
-        return -1
+    elif options.options.shared_lib:
+        # Load and run the startup transition of the shared library (Ada only?)
+        try:
+            dll = CDLL('./{}.so'.format(datamodel.FVname))
+            dll_init = getattr(dll, 'lib{}init'.format(datamodel.FVname))
+            dll_init()
+        except OSError:
+            log.error('Shared library ./{}.so not found'
+                      .format(datamodel.FVname))
+            return -1
 
     # Define a Qt application (mandatory)
     app = QApplication(sys.argv)
@@ -295,8 +310,10 @@ def gui():
         editor.msc.connect(msc.addToMsc)
         if msgQ:
             encoder_backend.setMsgQ()
-        else:
+        elif udp:
             encoder_backend.setUDP()
+        elif dll:
+            encoder_backend.setSharedLib(dll)
         editor.backend = encoder_backend
         editor.log = log
         dockWidget = editor.parent()
@@ -340,10 +357,13 @@ def gui():
                 if isinstance(editor, asn1Viewer):
                     pollingThread.tm.connect(editor.receivedTM)
             pollingThread.start()
-    else:  # use UDP
+    elif udp:
         if hasTM:
             udp.tmPool = g_tmPool
         udp.start(hasTM)
+    elif dll:
+        # TODO Should register the TMs callbacks
+        pass
 
     # Associate the plotter manager to the main app
     myWidget.plotter = plotter