Runtime: Added PostStart methot to PLCObject, called after PLC is started, with all libraries and python object already created, and python extensions "Start" methods being called.
This is called before python thread processing py_eval blocks starts. Example purpose: attach additional ressource to web services
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz.
# See COPYING file for copyrights details.
from __future__ import absolute_import
import os
from lxml import etree
import util.paths as paths
from plcopen.structures import StdBlckLibs
from XSLTransform import XSLTransform
ScriptDirectory = paths.AbsDir(__file__)
class XSLTModelQuery(XSLTransform):
""" a class to handle XSLT queries on project and libs """
def __init__(self, controller, xsltpath, ext=None):
# arbitrary set debug to false, updated later
self.debug = False
# merge xslt extensions for library access to query specific ones
xsltext = [
("GetProject", lambda *_ignored:
[controller.GetProject(self.debug)]),
("GetStdLibs", lambda *_ignored:
[lib for lib in StdBlckLibs.values()]),
("GetExtensions", lambda *_ignored:
[ctn["types"] for ctn in controller.ConfNodeTypes])
]
if ext is not None:
xsltext.extend(ext)
XSLTransform.__init__(self,
os.path.join(ScriptDirectory, xsltpath),
xsltext)
def _process_xslt(self, root, debug, **kwargs):
self.debug = debug
return self.transform(root, **kwargs)
# -------------------------------------------------------------------------------
# Helpers functions for translating list of arguments
# from xslt to valid arguments
# -------------------------------------------------------------------------------
def _StringValue(x):
return x
def _BoolValue(x):
return x in ["true", "0"]
def _translate_args(translations, args):
return [translate(arg[0]) if len(arg) > 0 else None
for translate, arg in
zip(translations, args)]