plcopen/XSLTModelQuery.py
author Edouard Tisserant
Wed, 01 Mar 2023 10:54:54 +0100
changeset 3740 ac0e6de439b5
parent 2627 3ba6a2d26507
child 3750 f62625418bff
permissions -rw-r--r--
Linux runtime: overrun detection for real-time timers and for plc execution.

If real-time timer wakes-up PLC thread too late (10% over period), then
warning is logged.

If PLC code (IO retreive, execution, IO publish) takes longer than requested
PLC execution cycle, then warning is logged, and CPU hoogging is mitigated
by delaying next PLC execution a few cylces more until having at least
1ms minimal idle time.
#!/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)]