msousa@2649: #!/usr/bin/env python
msousa@2649: # -*- coding: utf-8 -*-
msousa@2649: 
msousa@2649: # This file is part of Beremiz runtime.
msousa@2649: #
msousa@2649: # Copyright (C) 2020: Mario de Sousa
msousa@2649: #
msousa@2649: # See COPYING.Runtime file for copyrights details.
msousa@2649: #
msousa@2649: # This library is free software; you can redistribute it and/or
msousa@2649: # modify it under the terms of the GNU Lesser General Public
msousa@2649: # License as published by the Free Software Foundation; either
msousa@2649: # version 2.1 of the License, or (at your option) any later version.
msousa@2649: 
msousa@2649: # This library is distributed in the hope that it will be useful,
msousa@2649: # but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@2649: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
msousa@2649: # Lesser General Public License for more details.
msousa@2649: 
msousa@2649: # You should have received a copy of the GNU Lesser General Public
msousa@2649: # License along with this library; if not, write to the Free Software
msousa@2649: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
msousa@2649: 
msousa@2649: 
msousa@2649: import json
msousa@2649: import os
msousa@2649: import ctypes
msousa@2649: 
msousa@2649: from formless import annotate, webform
msousa@2649: 
Edouard@2669: import runtime.NevowServer as NS
msousa@2649: 
msousa@2649: 
msousa@2649: # Will contain references to the C functions 
msousa@2649: # (implemented in beremiz/bacnet/runtime/server.c)
msousa@2649: # used to get/set the BACnet specific configuration paramters
msousa@2649: GetParamFuncs = {}
msousa@2649: SetParamFuncs = {}
msousa@2649: 
msousa@2649: 
msousa@2649: # Upon PLC load, this Dictionary is initialised with the BACnet configuration
msousa@2649: # hardcoded in the C file
msousa@2649: # (i.e. the configuration inserted in Beremiz IDE when project was compiled)
msousa@2649: _DefaultConfiguration = None
msousa@2649: 
msousa@2649: 
msousa@2649: # Dictionary that contains the BACnet configuration currently being shown
msousa@2649: # on the web interface
msousa@2649: # This configuration will almost always be identical to the current
msousa@2649: # configuration in the PLC (i.e., the current state stored in the 
msousa@2649: # C variables in the .so file).
msousa@2649: # The configuration viewed on the web will only be different to the current 
msousa@2649: # configuration when the user edits the configuration, and when
msousa@2649: # the user asks to save the edited configuration but it contains an error.
msousa@2649: _WebviewConfiguration = None
msousa@2649: 
msousa@2649: 
msousa@2649: # Dictionary that stores the BACnet configuration currently stored in a file
msousa@2649: # Currently only used to decide whether or not to show the "Delete" button on the
msousa@2649: # web interface (only shown if _SavedConfiguration is not None)
msousa@2649: _SavedConfiguration = None
msousa@2649: 
msousa@2649: 
msousa@2649: # File to which the new BACnet configuration gets stored on the PLC
msousa@2649: # Note that the stored configuration is likely different to the
msousa@2649: # configuration hardcoded in C generated code (.so file), so
msousa@2649: # this file should be persistent across PLC reboots so we can
msousa@2649: # re-configure the PLC (change values of variables in .so file)
msousa@2649: # before it gets a chance to start running
msousa@2649: #
msousa@2649: #_BACnetConfFilename = None
msousa@2649: _BACnetConfFilename = "/tmp/BeremizBACnetConfig.json"
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2667: class BN_StrippedString(annotate.String):
msousa@2667:     def __init__(self, *args, **kwargs):
msousa@2667:         annotate.String.__init__(self, strip = True, *args, **kwargs)
msousa@2667: 
msousa@2649: 
msousa@2649: 
msousa@2649: BACnet_parameters = [
msousa@2649:     #    param. name             label                                            ctype type      annotate type
msousa@2649:     # (C code var name)         (used on web interface)                          (C data type)    (web data type)
msousa@2649:     #                                                                                             (annotate.String,
msousa@2649:     #                                                                                              annotate.Integer, ...)
msousa@2667:     ("network_interface"      , _("Network Interface")                         , ctypes.c_char_p, BN_StrippedString),
msousa@2667:     ("port_number"            , _("UDP Port Number")                           , ctypes.c_char_p, BN_StrippedString),
msousa@2649:     ("comm_control_passwd"    , _("BACnet Communication Control Password")     , ctypes.c_char_p, annotate.String),
msousa@2649:     ("device_id"              , _("BACnet Device ID")                          , ctypes.c_int,    annotate.Integer),
msousa@2649:     ("device_name"            , _("BACnet Device Name")                        , ctypes.c_char_p, annotate.String),
msousa@2649:     ("device_location"        , _("BACnet Device Location")                    , ctypes.c_char_p, annotate.String),
msousa@2649:     ("device_description"     , _("BACnet Device Description")                 , ctypes.c_char_p, annotate.String),
msousa@2649:     ("device_appsoftware_ver" , _("BACnet Device Application Software Version"), ctypes.c_char_p, annotate.String)
msousa@2649:     ]
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: def _CheckPortnumber(port_number):
msousa@2649:     """ check validity of the port number """
msousa@2649:     try:
msousa@2649:         portnum = int(port_number)
msousa@2649:         if (portnum < 0) or (portnum > 65535):
msousa@2649:            raise Exception
msousa@2649:     except Exception:    
msousa@2649:         return False
msousa@2649:         
msousa@2649:     return True    
msousa@2649:     
msousa@2649: 
msousa@2649: 
msousa@2649: def _CheckDeviceID(device_id):
msousa@2649:     """ 
msousa@2649:     # check validity of the Device ID 
msousa@2649:     # NOTE: BACnet device (object) IDs are 22 bits long (not counting the 10 bits for the type ID)
msousa@2649:     #       so the Device instance ID is limited from 0 to 22^2-1 = 4194303
msousa@2649:     #       However, 4194303 is reserved for special use (similar to NULL pointer), so last
msousa@2649:     #       valid ID becomes 4194302
msousa@2649:     """
msousa@2649:     try:
msousa@2649:         devid = int(device_id)
msousa@2649:         if (devid < 0) or (devid > 4194302):
msousa@2649:             raise Exception
msousa@2649:     except Exception:    
msousa@2649:         return False
msousa@2649:         
msousa@2649:     return True    
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: def _CheckConfiguration(BACnetConfig):
msousa@2649:     res = True    
msousa@2649:     res = res and _CheckPortnumber(BACnetConfig["port_number"])
msousa@2649:     res = res and _CheckDeviceID  (BACnetConfig["device_id"])
msousa@2649:     return res
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: def _CheckWebConfiguration(BACnetConfig):
msousa@2649:     res = True
msousa@2649:     
msousa@2649:     # check the port number
msousa@2649:     if not _CheckPortnumber(BACnetConfig["port_number"]):
msousa@2649:         raise annotate.ValidateError(
msousa@2649:             {"port_number": "Invalid port number: " + str(BACnetConfig["port_number"])},
msousa@2649:             _("BACnet configuration error:"))
msousa@2649:         res = False
msousa@2649:     
msousa@2649:     if not _CheckDeviceID(BACnetConfig["device_id"]):
msousa@2649:         raise annotate.ValidateError(
msousa@2649:             {"device_id": "Invalid device ID: " + str(BACnetConfig["device_id"])},
msousa@2649:             _("BACnet configuration error:"))
msousa@2649:         res = False
msousa@2649:         
msousa@2649:     return res
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: def _SetSavedConfiguration(BACnetConfig):
msousa@2649:     """ Stores in a file a dictionary containing the BACnet parameter configuration """
msousa@2649:     with open(os.path.realpath(_BACnetConfFilename), 'w') as f:
msousa@2649:         json.dump(BACnetConfig, f, sort_keys=True, indent=4)
msousa@2649:     global _SavedConfiguration
msousa@2649:     _SavedConfiguration = BACnetConfig
msousa@2649: 
msousa@2649: 
msousa@2649: def _DelSavedConfiguration():
msousa@2649:     """ Deletes the file cotaining the persistent BACnet configuration """
msousa@2649:     if os.path.exists(_BACnetConfFilename):
msousa@2649:         os.remove(_BACnetConfFilename)
msousa@2649: 
msousa@2649: 
msousa@2649: def _GetSavedConfiguration():
msousa@2649:     """
msousa@2649:     # Returns a dictionary containing the BACnet parameter configuration
msousa@2649:     # that was last saved to file. If no file exists, then return None
msousa@2649:     """
msousa@2649:     try:
msousa@2649:         #if os.path.isfile(_BACnetConfFilename):
msousa@2649:         saved_config = json.load(open(_BACnetConfFilename))
msousa@2649:     except Exception:    
msousa@2649:         return None
msousa@2649: 
msousa@2649:     if _CheckConfiguration(saved_config):
msousa@2649:         return saved_config
msousa@2649:     else:
msousa@2649:         return None
msousa@2649: 
msousa@2649: 
msousa@2649: def _GetPLCConfiguration():
msousa@2649:     """
msousa@2649:     # Returns a dictionary containing the current BACnet parameter configuration
msousa@2649:     # stored in the C variables in the loaded PLC (.so file)
msousa@2649:     """
msousa@2649:     current_config = {}
msousa@2649:     for par_name, x1, x2, x3 in BACnet_parameters:
msousa@2649:         value = GetParamFuncs[par_name]()
msousa@2649:         if value is not None:
msousa@2649:             current_config[par_name] = value
msousa@2649:     
msousa@2649:     return current_config
msousa@2649: 
msousa@2649: 
msousa@2649: def _SetPLCConfiguration(BACnetConfig):
msousa@2649:     """
msousa@2649:     # Stores the BACnet parameter configuration into the
msousa@2649:     # the C variables in the loaded PLC (.so file)
msousa@2649:     """
msousa@2649:     for par_name in BACnetConfig:
msousa@2649:         value = BACnetConfig[par_name]
Edouard@2669:         #PLCObject.LogMessage("BACnet web server extension::_SetPLCConfiguration()  Setting "
msousa@2649:         #                       + par_name + " to " + str(value) )
msousa@2649:         if value is not None:
msousa@2649:             SetParamFuncs[par_name](value)
msousa@2649:     # update the configuration shown on the web interface
msousa@2649:     global _WebviewConfiguration 
msousa@2649:     _WebviewConfiguration = _GetPLCConfiguration()
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: def _GetWebviewConfigurationValue(ctx, argument):
msousa@2649:     """
msousa@2649:     # Callback function, called by the web interface (NevowServer.py)
msousa@2649:     # to fill in the default value of each parameter
msousa@2649:     """
msousa@2649:     try:
msousa@2649:         return _WebviewConfiguration[argument.name]
msousa@2649:     except Exception:
msousa@2649:         return ""
msousa@2649: 
msousa@2649: 
msousa@2649: # The configuration of the web form used to see/edit the BACnet parameters
msousa@2649: webFormInterface = [(name, web_dtype (label=web_label, default=_GetWebviewConfigurationValue)) 
msousa@2649:                     for name, web_label, c_dtype, web_dtype in BACnet_parameters]
msousa@2649: 
msousa@2649: 
msousa@2649: def OnButtonSave(**kwargs):
msousa@2649:     """
msousa@2649:     # Function called when user clicks 'Save' button in web interface
msousa@2649:     # The function will configure the BACnet plugin in the PLC with the values
msousa@2649:     # specified in the web interface. However, values must be validated first!
msousa@2649:     """
msousa@2649: 
Edouard@2669:     #PLCObject.LogMessage("BACnet web server extension::OnButtonSave()  Called")
msousa@2649:     
msousa@2649:     newConfig = {}
msousa@2649:     for par_name, x1, x2, x3 in BACnet_parameters:
msousa@2649:         value = kwargs.get(par_name, None)
msousa@2649:         if value is not None:
msousa@2649:             newConfig[par_name] = value
msousa@2649: 
msousa@2649:     
msousa@2649:     # First check if configuration is OK.
msousa@2649:     if not _CheckWebConfiguration(newConfig):
msousa@2649:         return
msousa@2649: 
msousa@2649:     # store to file the new configuration so that 
msousa@2649:     # we can recoup the configuration the next time the PLC
msousa@2649:     # has a cold start (i.e. when Beremiz_service.py is retarted)
msousa@2649:     _SetSavedConfiguration(newConfig)
msousa@2649: 
msousa@2649:     # Configure PLC with the current BACnet parameters
msousa@2649:     _SetPLCConfiguration(newConfig)
msousa@2649: 
Edouard@2670: 
Edouard@2670: 
Edouard@2670: def OnButtonReset(**kwargs):
msousa@2649:     """
msousa@2649:     # Function called when user clicks 'Delete' button in web interface
msousa@2649:     # The function will delete the file containing the persistent
msousa@2649:     # BACnet configution
msousa@2649:     """
msousa@2649: 
msousa@2649:     # Delete the file
msousa@2649:     _DelSavedConfiguration()
msousa@2649:     # Set the current configuration to the default (hardcoded in C)
msousa@2649:     _SetPLCConfiguration(_DefaultConfiguration)
msousa@2649:     # Reset global variable
msousa@2649:     global _SavedConfiguration
msousa@2649:     _SavedConfiguration = None
Edouard@2670: 
Edouard@2670: 
Edouard@2670: 
Edouard@2670: # location_str is replaced by extension's value in CTNGenerateC call
Edouard@2669: def _runtime_bacnet_websettings_%(location_str)s_init():
msousa@2649:     """
msousa@2649:     # Callback function, called (by PLCObject.py) when a new PLC program
msousa@2649:     # (i.e. XXX.so file) is transfered to the PLC runtime
msousa@2649:     # and oaded into memory
msousa@2649:     """
msousa@2649: 
Edouard@2669:     #PLCObject.LogMessage("BACnet web server extension::OnLoadPLC() Called...")
Edouard@2669: 
Edouard@2669:     if PLCObject.PLClibraryHandle is None:
msousa@2649:         # PLC was loaded but we don't have access to the library of compiled code (.so lib)?
msousa@2649:         # Hmm... This shold never occur!! 
msousa@2649:         return  
msousa@2649: 
msousa@2649:     # Map the get/set functions (written in C code) we will be using to get/set the configuration parameters
msousa@2649:     for name, web_label, c_dtype, web_dtype in BACnet_parameters:
Edouard@2670:         # location_str is replaced by extension's value in CTNGenerateC call
Edouard@2670:         GetParamFuncName = "__bacnet_%(location_str)s_get_ConfigParam_" + name
Edouard@2670:         SetParamFuncName = "__bacnet_%(location_str)s_set_ConfigParam_" + name
msousa@2649:         
Edouard@2669:         GetParamFuncs[name]          = getattr(PLCObject.PLClibraryHandle, GetParamFuncName)
msousa@2649:         GetParamFuncs[name].restype  = c_dtype
msousa@2649:         GetParamFuncs[name].argtypes = None
msousa@2649:         
Edouard@2669:         SetParamFuncs[name]          = getattr(PLCObject.PLClibraryHandle, SetParamFuncName)
msousa@2649:         SetParamFuncs[name].restype  = None
msousa@2649:         SetParamFuncs[name].argtypes = [c_dtype]
msousa@2649: 
msousa@2649:     # Default configuration is the configuration done in Beremiz IDE
msousa@2649:     # whose parameters get hardcoded into C, and compiled into the .so file
msousa@2649:     # We read the default configuration from the .so file before the values
msousa@2649:     # get changed by the user using the web server, or by the call (further on)
msousa@2649:     # to _SetPLCConfiguration(SavedConfiguration)
msousa@2649:     global _DefaultConfiguration 
msousa@2649:     _DefaultConfiguration = _GetPLCConfiguration()
msousa@2649:     
msousa@2649:     # Show the current PLC configuration on the web interface        
msousa@2649:     global _WebviewConfiguration
msousa@2649:     _WebviewConfiguration = _GetPLCConfiguration()
msousa@2649:  
msousa@2649:     # Read from file the last used configuration, which is likely
msousa@2649:     # different to the hardcoded configuration.
msousa@2649:     # We Reset the current configuration (i.e., the config stored in the 
msousa@2649:     # variables of .so file) to this saved configuration
msousa@2649:     # so the PLC will start off with this saved configuration instead
msousa@2649:     # of the hardcoded (in Beremiz C generated code) configuration values.
msousa@2649:     #
msousa@2649:     # Note that _SetPLCConfiguration() will also update 
msousa@2649:     # _WebviewConfiguration , if necessary.
msousa@2649:     global _SavedConfiguration
msousa@2649:     _SavedConfiguration  = _GetSavedConfiguration()
msousa@2649:     if _SavedConfiguration is not None:
msousa@2649:         if _CheckConfiguration(_SavedConfiguration):
msousa@2649:             _SetPLCConfiguration(_SavedConfiguration)
msousa@2649:             
Edouard@2672:     WebSettings = NS.newExtensionSetting("BACnet extension", "bacnet_token")
Edouard@2670: 
msousa@2649:     # Configure the web interface to include the BACnet config parameters
Edouard@2670:     WebSettings.addSettings(
msousa@2649:         "BACnetConfigParm",                # name
msousa@2649:         _("BACnet Configuration"),         # description
msousa@2649:         webFormInterface,                  # fields
Edouard@2670:         _("Apply"),  # button label
msousa@2649:         OnButtonSave)                      # callback    
Edouard@2670: 
Edouard@2670:     # Add the Delete button to the web interface
Edouard@2670:     WebSettings.addSettings(
Edouard@2670:         "BACnetConfigDelSaved",                   # name
msousa@2649:         _("BACnet Configuration"),                # description
Edouard@2670:         [ ("status",
Edouard@2670:            annotate.String(label=_("Current state"),
Edouard@2670:                            immutable=True,
Edouard@2670:                            default=lambda *k:getConfigStatus())),
Edouard@2670:         ],                                       # fields  (empty, no parameters required!)
Edouard@2670:         _("Reset"), # button label
Edouard@2670:         OnButtonReset) 
Edouard@2670: 
Edouard@2670: 
Edouard@2670: 
Edouard@2670: def getConfigStatus():
Edouard@2670:     if _WebviewConfiguration == _DefaultConfiguration :
Edouard@2670:         return "Unchanged"
Edouard@2670:     return "Modified"
Edouard@2670: 
Edouard@2670: 
Edouard@2670: # location_str is replaced by extension's value in CTNGenerateC call
Edouard@2669: def _runtime_bacnet_websettings_%(location_str)s_cleanup():
msousa@2649:     """
msousa@2649:     # Callback function, called (by PLCObject.py) when a PLC program is unloaded from memory
msousa@2649:     """
msousa@2649: 
Edouard@2669:     #PLCObject.LogMessage("BACnet web server extension::OnUnLoadPLC() Called...")
msousa@2649:     
Edouard@2672:     NS.removeExtensionSetting("bacnet_token")
Edouard@2670:     
msousa@2649:     GetParamFuncs = {}
msousa@2649:     SetParamFuncs = {}
msousa@2649:     _WebviewConfiguration = None
msousa@2649:     _SavedConfiguration   = None
msousa@2649: 
msousa@2649: 
msousa@2649: 
msousa@2649: