andrej@1731: #!/usr/bin/env python
andrej@1731: # -*- coding: utf-8 -*-
andrej@1731: 
andrej@1731: # This file is part of Beremiz, a Integrated Development Environment for
andrej@1731: # programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
andrej@1731: #
andrej@1731: # Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
andrej@1731: # Copyright (C) 2017: Andrey Skvortsov
andrej@1731: #
andrej@1731: # See COPYING file for copyrights details.
andrej@1731: #
andrej@1731: # This program is free software; you can redistribute it and/or
andrej@1731: # modify it under the terms of the GNU General Public License
andrej@1731: # as published by the Free Software Foundation; either version 2
andrej@1731: # of the License, or (at your option) any later version.
andrej@1731: #
andrej@1731: # This program is distributed in the hope that it will be useful,
andrej@1731: # but WITHOUT ANY WARRANTY; without even the implied warranty of
andrej@1731: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
andrej@1731: # GNU General Public License for more details.
andrej@1731: #
andrej@1731: # You should have received a copy of the GNU General Public License
andrej@1731: # along with this program; if not, write to the Free Software
andrej@1731: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
andrej@1731: 
andrej@1731: # Package initialisation
andrej@1731: 
andrej@1881: 
edouard@3721: import os
kinsamanka@3757: import importlib
andrej@1731: from os import listdir, path
Edouard@2463: from connectors.ConnectorBase import ConnectorBase
andrej@1731: 
edouard@3884: connectors_packages = ["ERPC", "WAMP"]
Edouard@2329: 
andrej@1731: 
andrej@1731: def _GetLocalConnectorClassFactory(name):
kinsamanka@3757:     return lambda: getattr(importlib.import_module(f"connectors.{name}"),
kinsamanka@3757:                            f"{name}_connector_factory")
andrej@1731: 
andrej@2182: 
Edouard@2329: connectors = {name: _GetLocalConnectorClassFactory(name)
Edouard@2329:               for name in connectors_packages}
denis@2007: 
Edouard@2329: _dialogs_imported = False
Edouard@2329: per_URI_connectors = None
edouard@2492: schemes = None
edouard@2492: 
andrej@2182: 
Edouard@2329: # lazy import of connectors dialogs, only if used
Edouard@2329: def _Import_Dialogs():
Edouard@2329:     global per_URI_connectors, schemes, _dialogs_imported
edouard@2492:     if not _dialogs_imported:
Edouard@2329:         _dialogs_imported = True
Edouard@2329:         per_URI_connectors = {}
Edouard@2329:         schemes = []
Edouard@2329:         for con_name in connectors_packages:
kinsamanka@3757:             module = importlib.import_module(f"connectors.{con_name}_dialog")
denis@2007: 
Edouard@2329:             for scheme in module.Schemes:
Edouard@2329:                 per_URI_connectors[scheme] = getattr(module, con_name + '_dialog')
Edouard@2329:                 schemes += [scheme]
denis@2007: 
andrej@1731: 
edouard@3847: LocalHost = os.environ.get("BEREMIZ_LOCAL_HOST", "127.0.0.1")
edouard@3721: 
andrej@1731: def ConnectorFactory(uri, confnodesroot):
andrej@1731:     """
andrej@1731:     Return a connector corresponding to the URI
andrej@1731:     or None if cannot connect to URI
andrej@1731:     """
Edouard@2463:     _scheme = uri.split("://")[0].upper()
Edouard@2478: 
Edouard@2463:     if _scheme == "LOCAL":
andrej@1731:         # Local is special case
edouard@3884:         # ERPC connection to local runtime
andrej@1731:         # started on demand, listening on random port
edouard@3884:         scheme = "ERPC"
edouard@3501:         runtime_port = confnodesroot.StartLocalRuntime()
edouard@3884:         uri = f"ERPC://{LocalHost}:{runtime_port}"
Edouard@2478: 
Edouard@2463:     elif _scheme in connectors:
Edouard@2463:         scheme = _scheme
Edouard@2463:     elif _scheme[-1] == 'S' and _scheme[:-1] in connectors:
Edouard@2463:         scheme = _scheme[:-1]
andrej@1731:     else:
andrej@1731:         return None
andrej@1731: 
edouard@3884:     return (connectors[scheme]
edouard@3884:             ()  # triggers import
edouard@3884:             (uri, confnodesroot))  # creates object
edouard@2492: 
Edouard@2329: def EditorClassFromScheme(scheme):
Edouard@2329:     _Import_Dialogs()
edouard@2492:     return per_URI_connectors.get(scheme, None)
edouard@2492: 
denis@2007: 
Edouard@2329: def ConnectorSchemes():
Edouard@2329:     _Import_Dialogs()
Edouard@2329:     return schemes