mirror of
https://github.com/qgis/QGIS.git
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2628c480c5
Prevent changes to files that weren't changed between releases. This eases review of the changes between releases significantly.
792 lines
25 KiB
Python
792 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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utils.py
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---------------------
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Date : November 2009
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Copyright : (C) 2009 by Martin Dobias
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Email : wonder dot sk at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Martin Dobias'
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__date__ = 'November 2009'
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__copyright__ = '(C) 2009, Martin Dobias'
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"""
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QGIS utilities module
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"""
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from qgis.PyQt.QtCore import QCoreApplication, QLocale, QThread, qDebug
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from qgis.PyQt.QtWidgets import QPushButton, QApplication
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from qgis.core import Qgis, QgsMessageLog, qgsfunction, QgsMessageOutput
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from qgis.gui import QgsMessageBar
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import os
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import sys
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import traceback
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import glob
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import os.path
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import configparser
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import warnings
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import codecs
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import time
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import functools
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import builtins
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builtins.__dict__['unicode'] = str
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builtins.__dict__['basestring'] = str
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builtins.__dict__['long'] = int
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builtins.__dict__['Set'] = set
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# ######################
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# ERROR HANDLING
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warnings.simplefilter('default')
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warnings.filterwarnings("ignore", "the sets module is deprecated")
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def showWarning(message, category, filename, lineno, file=None, line=None):
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stk = ""
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for s in traceback.format_stack()[:-2]:
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if hasattr(s, 'decode'):
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stk += s.decode(sys.getfilesystemencoding())
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else:
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stk += s
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if hasattr(filename, 'decode'):
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decoded_filename = filename.decode(sys.getfilesystemencoding())
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else:
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decoded_filename = filename
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QgsMessageLog.logMessage(
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u"warning:{}\ntraceback:{}".format(warnings.formatwarning(message, category, decoded_filename, lineno), stk),
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QCoreApplication.translate("Python", "Python warning")
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)
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def showException(type, value, tb, msg, messagebar=False):
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if msg is None:
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msg = QCoreApplication.translate('Python', 'An error has occurred while executing Python code:')
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logmessage = ''
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for s in traceback.format_exception(type, value, tb):
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logmessage += s.decode('utf-8', 'replace') if hasattr(s, 'decode') else s
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title = QCoreApplication.translate('Python', 'Python error')
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QgsMessageLog.logMessage(logmessage, title)
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try:
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blockingdialog = QApplication.instance().activeModalWidget()
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window = QApplication.instance().activeWindow()
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except:
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blockingdialog = QApplication.activeModalWidget()
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window = QApplication.activeWindow()
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# Still show the normal blocking dialog in this case for now.
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if blockingdialog or not window or not messagebar or not iface:
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open_stack_dialog(type, value, tb, msg)
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return
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bar = iface.messageBar() if iface else None
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# If it's not the main window see if we can find a message bar to report the error in
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if not window.objectName() == "QgisApp":
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widgets = window.findChildren(QgsMessageBar)
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if widgets:
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# Grab the first message bar for now
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bar = widgets[0]
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item = bar.currentItem()
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if item and item.property("Error") == msg:
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# Return of we already have a message with the same error message
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return
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widget = bar.createMessage(title, msg + " " + QCoreApplication.translate("Python", "See message log (Python Error) for more details."))
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widget.setProperty("Error", msg)
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stackbutton = QPushButton(QCoreApplication.translate("Python", "Stack trace"), pressed=functools.partial(open_stack_dialog, type, value, tb, msg))
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button = QPushButton(QCoreApplication.translate("Python", "View message log"), pressed=show_message_log)
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widget.layout().addWidget(stackbutton)
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widget.layout().addWidget(button)
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bar.pushWidget(widget, Qgis.Warning)
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def show_message_log(pop_error=True):
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if pop_error:
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iface.messageBar().popWidget()
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iface.openMessageLog()
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def open_stack_dialog(type, value, tb, msg, pop_error=True):
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if pop_error and iface is not None:
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iface.messageBar().popWidget()
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if msg is None:
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msg = QCoreApplication.translate('Python', 'An error has occurred while executing Python code:')
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# TODO Move this to a template HTML file
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txt = u'''<font color="red"><b>{msg}</b></font>
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<br>
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<h3>{main_error}</h3>
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<pre>
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{error}
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</pre>
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<br>
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<b>{version_label}</b> {num}
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<br>
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<b>{qgis_label}</b> {qversion} {qgisrelease}, {devversion}
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<br>
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<h4>{pypath_label}</h4>
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<ul>
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{pypath}
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</ul>'''
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error = ''
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lst = traceback.format_exception(type, value, tb)
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for s in lst:
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error += s.decode('utf-8', 'replace') if hasattr(s, 'decode') else s
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error = error.replace('\n', '<br>')
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main_error = lst[-1].decode('utf-8', 'replace') if hasattr(lst[-1], 'decode') else lst[-1]
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version_label = QCoreApplication.translate('Python', 'Python version:')
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qgis_label = QCoreApplication.translate('Python', 'QGIS version:')
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pypath_label = QCoreApplication.translate('Python', 'Python Path:')
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txt = txt.format(msg=msg,
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main_error=main_error,
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error=error,
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version_label=version_label,
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num=sys.version,
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qgis_label=qgis_label,
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qversion=Qgis.QGIS_VERSION,
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qgisrelease=Qgis.QGIS_RELEASE_NAME,
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devversion=Qgis.QGIS_DEV_VERSION,
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pypath_label=pypath_label,
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pypath=u"".join(u"<li>{}</li>".format(path) for path in sys.path))
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txt = txt.replace(' ', ' ') # preserve whitespaces for nicer output
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dlg = QgsMessageOutput.createMessageOutput()
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dlg.setTitle(msg)
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dlg.setMessage(txt, QgsMessageOutput.MessageHtml)
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dlg.showMessage()
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def qgis_excepthook(type, value, tb):
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# detect if running in the main thread
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in_main_thread = QCoreApplication.instance() is None or QThread.currentThread() == QCoreApplication.instance().thread()
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# only use messagebar if running in main thread - otherwise it will crash!
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showException(type, value, tb, None, messagebar=in_main_thread)
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def installErrorHook():
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"""
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Installs the QGIS application error/warning hook. This causes Python exceptions
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to be intercepted by the QGIS application and shown in the main window message bar
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and in custom dialogs.
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Generally you shouldn't call this method - it's automatically called by
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the QGIS app on startup, and has no use in standalone applications and scripts.
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"""
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sys.excepthook = qgis_excepthook
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warnings.showwarning = showWarning
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def uninstallErrorHook():
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sys.excepthook = sys.__excepthook__
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# initialize 'iface' object
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iface = None
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def initInterface(pointer):
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from qgis.gui import QgisInterface
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from sip import wrapinstance
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global iface
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iface = wrapinstance(pointer, QgisInterface)
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#######################
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# PLUGINS
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# list of plugin paths. it gets filled in by the QGIS python library
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plugin_paths = []
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# dictionary of plugins
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plugins = {}
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plugin_times = {}
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# list of active (started) plugins
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active_plugins = []
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# list of plugins in plugin directory and home plugin directory
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available_plugins = []
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# dictionary of plugins providing metadata in a text file (metadata.txt)
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# key = plugin package name, value = config parser instance
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plugins_metadata_parser = {}
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def findPlugins(path):
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""" for internal use: return list of plugins in given path """
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for plugin in glob.glob(path + "/*"):
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if not os.path.isdir(plugin):
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continue
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if not os.path.exists(os.path.join(plugin, '__init__.py')):
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continue
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metadataFile = os.path.join(plugin, 'metadata.txt')
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if not os.path.exists(metadataFile):
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continue
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cp = configparser.ConfigParser()
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try:
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with codecs.open(metadataFile, "r", "utf8") as f:
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cp.read_file(f)
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except:
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cp = None
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pluginName = os.path.basename(plugin)
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yield (pluginName, cp)
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def metadataParser():
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"""Used by other modules to access the local parser object"""
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return plugins_metadata_parser
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def updateAvailablePlugins():
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""" Go through the plugin_paths list and find out what plugins are available. """
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# merge the lists
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plugins = []
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metadata_parser = {}
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for pluginpath in plugin_paths:
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for pluginName, parser in findPlugins(pluginpath):
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if parser is None:
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continue
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if pluginName not in plugins:
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plugins.append(pluginName)
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metadata_parser[pluginName] = parser
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global available_plugins
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available_plugins = plugins
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global plugins_metadata_parser
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plugins_metadata_parser = metadata_parser
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def pluginMetadata(packageName, fct):
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""" fetch metadata from a plugin - use values from metadata.txt """
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try:
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return plugins_metadata_parser[packageName].get('general', fct)
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except Exception:
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return "__error__"
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def loadPlugin(packageName):
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""" load plugin's package """
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try:
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__import__(packageName)
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return True
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except:
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pass # continue...
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# snake in the grass, we know it's there
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sys.path_importer_cache.clear()
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# retry
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try:
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__import__(packageName)
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return True
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except:
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msg = QCoreApplication.translate("Python", "Couldn't load plugin '{0}'").format(packageName)
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return False
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def _startPlugin(packageName):
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""" initializes a plugin, but does not load GUI """
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global plugins, active_plugins, iface, plugin_times
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if packageName in active_plugins:
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return False
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if packageName not in sys.modules:
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return False
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package = sys.modules[packageName]
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# create an instance of the plugin
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try:
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plugins[packageName] = package.classFactory(iface)
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except:
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_unloadPluginModules(packageName)
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errMsg = QCoreApplication.translate("Python", "Couldn't load plugin '{0}'").format(packageName)
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msg = QCoreApplication.translate("Python", "{0} due to an error when calling its classFactory() method").format(errMsg)
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return False
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return True
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def _addToActivePlugins(packageName, duration):
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""" Adds a plugin to the list of active plugins """
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active_plugins.append(packageName)
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plugin_times[packageName] = "{0:02f}s".format(duration)
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def startPlugin(packageName):
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""" initialize the plugin """
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global plugins, active_plugins, iface, plugin_times
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start = time.process_time()
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if not _startPlugin(packageName):
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return False
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# initGui
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try:
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plugins[packageName].initGui()
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except:
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del plugins[packageName]
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_unloadPluginModules(packageName)
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errMsg = QCoreApplication.translate("Python", "Couldn't load plugin '{0}'").format(packageName)
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msg = QCoreApplication.translate("Python", "{0} due to an error when calling its initGui() method").format(errMsg)
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return False
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end = time.process_time()
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_addToActivePlugins(packageName, end - start)
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return True
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def startProcessingPlugin(packageName):
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""" initialize only the Processing components of a plugin """
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global plugins, active_plugins, iface, plugin_times
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start = time.process_time()
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if not _startPlugin(packageName):
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return False
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errMsg = QCoreApplication.translate("Python", "Couldn't load plugin '{0}'").format(packageName)
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if not hasattr(plugins[packageName], 'initProcessing'):
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del plugins[packageName]
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_unloadPluginModules(packageName)
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msg = QCoreApplication.translate("Python", "{0} - plugin has no initProcessing() method").format(errMsg)
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return False
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# initProcessing
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try:
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plugins[packageName].initProcessing()
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except:
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del plugins[packageName]
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_unloadPluginModules(packageName)
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msg = QCoreApplication.translate("Python", "{0} due to an error when calling its initProcessing() method").format(errMsg)
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return False
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end = time.process_time()
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_addToActivePlugins(packageName, end - start)
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return True
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def canUninstallPlugin(packageName):
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""" confirm that the plugin can be uninstalled """
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global plugins, active_plugins
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if packageName not in plugins:
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return False
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if packageName not in active_plugins:
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return False
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try:
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metadata = plugins[packageName]
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if "canBeUninstalled" not in dir(metadata):
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return True
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return bool(metadata.canBeUninstalled())
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except:
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msg = "Error calling " + packageName + ".canBeUninstalled"
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return True
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def unloadPlugin(packageName):
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""" unload and delete plugin! """
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global plugins, active_plugins
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if packageName not in plugins:
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return False
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if packageName not in active_plugins:
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return False
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try:
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plugins[packageName].unload()
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del plugins[packageName]
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active_plugins.remove(packageName)
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_unloadPluginModules(packageName)
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return True
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except Exception as e:
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msg = QCoreApplication.translate("Python", "Error while unloading plugin {0}").format(packageName)
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showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg, messagebar=True)
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return False
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def _unloadPluginModules(packageName):
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""" unload plugin package with all its modules (files) """
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global _plugin_modules
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mods = _plugin_modules[packageName]
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for mod in mods:
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if not mod in sys.modules:
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continue
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# if it looks like a Qt resource file, try to do a cleanup
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# otherwise we might experience a segfault next time the plugin is loaded
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# because Qt will try to access invalid plugin resource data
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try:
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if hasattr(sys.modules[mod], 'qCleanupResources'):
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sys.modules[mod].qCleanupResources()
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except:
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# Print stack trace for debug
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qDebug("qCleanupResources error:\n%s" % traceback.format_exc())
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# try removing path
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if hasattr(sys.modules[mod], '__path__'):
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for path in sys.modules[mod].__path__:
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try:
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sys.path.remove(path)
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except ValueError:
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# Discard if path is not there
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pass
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# try to remove the module from python
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try:
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del sys.modules[mod]
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except:
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qDebug("Error when removing module:\n%s" % traceback.format_exc())
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# remove the plugin entry
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del _plugin_modules[packageName]
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def isPluginLoaded(packageName):
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""" find out whether a plugin is active (i.e. has been started) """
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global plugins, active_plugins
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if packageName not in plugins:
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return False
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return (packageName in active_plugins)
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def reloadPlugin(packageName):
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""" unload and start again a plugin """
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global active_plugins
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if packageName not in active_plugins:
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return # it's not active
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unloadPlugin(packageName)
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loadPlugin(packageName)
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startPlugin(packageName)
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def showPluginHelp(packageName=None, filename="index", section=""):
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""" show a help in the user's html browser. The help file should be named index-ll_CC.html or index-ll.html"""
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try:
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source = ""
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if packageName is None:
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import inspect
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source = inspect.currentframe().f_back.f_code.co_filename
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else:
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source = sys.modules[packageName].__file__
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except:
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return
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path = os.path.dirname(source)
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locale = str(QLocale().name())
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helpfile = os.path.join(path, filename + "-" + locale + ".html")
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if not os.path.exists(helpfile):
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helpfile = os.path.join(path, filename + "-" + locale.split("_")[0] + ".html")
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if not os.path.exists(helpfile):
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helpfile = os.path.join(path, filename + "-en.html")
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if not os.path.exists(helpfile):
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helpfile = os.path.join(path, filename + "-en_US.html")
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if not os.path.exists(helpfile):
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helpfile = os.path.join(path, filename + ".html")
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if os.path.exists(helpfile):
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url = "file://" + helpfile
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if section != "":
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url = url + "#" + section
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iface.openURL(url, False)
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def pluginDirectory(packageName):
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""" return directory where the plugin resides. Plugin must be loaded already """
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return os.path.dirname(sys.modules[packageName].__file__)
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|
def reloadProjectMacros():
|
|
# unload old macros
|
|
unloadProjectMacros()
|
|
|
|
from qgis.core import QgsProject
|
|
|
|
code, ok = QgsProject.instance().readEntry("Macros", "/pythonCode")
|
|
if not ok or not code or code == '':
|
|
return
|
|
|
|
# create a new empty python module
|
|
import imp
|
|
|
|
mod = imp.new_module("proj_macros_mod")
|
|
|
|
# set the module code and store it sys.modules
|
|
exec(str(code), mod.__dict__)
|
|
sys.modules["proj_macros_mod"] = mod
|
|
|
|
# load new macros
|
|
openProjectMacro()
|
|
|
|
|
|
def unloadProjectMacros():
|
|
if "proj_macros_mod" not in sys.modules:
|
|
return
|
|
# unload old macros
|
|
closeProjectMacro()
|
|
# destroy the reference to the module
|
|
del sys.modules["proj_macros_mod"]
|
|
|
|
|
|
def openProjectMacro():
|
|
if "proj_macros_mod" not in sys.modules:
|
|
return
|
|
mod = sys.modules["proj_macros_mod"]
|
|
if hasattr(mod, 'openProject'):
|
|
mod.openProject()
|
|
|
|
|
|
def saveProjectMacro():
|
|
if "proj_macros_mod" not in sys.modules:
|
|
return
|
|
mod = sys.modules["proj_macros_mod"]
|
|
if hasattr(mod, 'saveProject'):
|
|
mod.saveProject()
|
|
|
|
|
|
def closeProjectMacro():
|
|
if "proj_macros_mod" not in sys.modules:
|
|
return
|
|
mod = sys.modules["proj_macros_mod"]
|
|
if hasattr(mod, 'closeProject'):
|
|
mod.closeProject()
|
|
|
|
|
|
#######################
|
|
# SERVER PLUGINS
|
|
#
|
|
# TODO: move into server_utils.py ?
|
|
|
|
# list of plugin paths. it gets filled in by the QGIS python library
|
|
server_plugin_paths = []
|
|
|
|
# dictionary of plugins
|
|
server_plugins = {}
|
|
|
|
# list of active (started) plugins
|
|
server_active_plugins = []
|
|
|
|
|
|
# initialize 'serverIface' object
|
|
serverIface = None
|
|
|
|
|
|
def initServerInterface(pointer):
|
|
from qgis.server import QgsServerInterface
|
|
from sip import wrapinstance
|
|
sys.excepthook = sys.__excepthook__
|
|
global serverIface
|
|
serverIface = wrapinstance(pointer, QgsServerInterface)
|
|
|
|
|
|
def startServerPlugin(packageName):
|
|
""" initialize the plugin """
|
|
global server_plugins, server_active_plugins, serverIface
|
|
|
|
if packageName in server_active_plugins:
|
|
return False
|
|
if packageName not in sys.modules:
|
|
return False
|
|
|
|
package = sys.modules[packageName]
|
|
|
|
errMsg = QCoreApplication.translate("Python", "Couldn't load server plugin {0}").format(packageName)
|
|
|
|
# create an instance of the plugin
|
|
try:
|
|
server_plugins[packageName] = package.serverClassFactory(serverIface)
|
|
except:
|
|
_unloadPluginModules(packageName)
|
|
msg = QCoreApplication.translate("Python",
|
|
"{0} due to an error when calling its serverClassFactory() method").format(errMsg)
|
|
showException(sys.exc_info()[0], sys.exc_info()[1], sys.exc_info()[2], msg)
|
|
return False
|
|
|
|
# add to active plugins
|
|
server_active_plugins.append(packageName)
|
|
return True
|
|
|
|
|
|
def spatialite_connect(*args, **kwargs):
|
|
"""returns a dbapi2.Connection to a SpatiaLite db
|
|
using the "mod_spatialite" extension (python3)"""
|
|
import sqlite3
|
|
import re
|
|
|
|
def fcnRegexp(pattern, string):
|
|
result = re.search(pattern, string)
|
|
return True if result else False
|
|
|
|
con = sqlite3.dbapi2.connect(*args, **kwargs)
|
|
con.enable_load_extension(True)
|
|
cur = con.cursor()
|
|
libs = [
|
|
# SpatiaLite >= 4.2 and Sqlite >= 3.7.17, should work on all platforms
|
|
("mod_spatialite", "sqlite3_modspatialite_init"),
|
|
# SpatiaLite >= 4.2 and Sqlite < 3.7.17 (Travis)
|
|
("mod_spatialite.so", "sqlite3_modspatialite_init"),
|
|
# SpatiaLite < 4.2 (linux)
|
|
("libspatialite.so", "sqlite3_extension_init")
|
|
]
|
|
found = False
|
|
for lib, entry_point in libs:
|
|
try:
|
|
cur.execute("select load_extension('{}', '{}')".format(lib, entry_point))
|
|
except sqlite3.OperationalError:
|
|
continue
|
|
else:
|
|
found = True
|
|
break
|
|
if not found:
|
|
raise RuntimeError("Cannot find any suitable spatialite module")
|
|
cur.close()
|
|
con.enable_load_extension(False)
|
|
con.create_function("regexp", 2, fcnRegexp)
|
|
return con
|
|
|
|
|
|
class OverrideCursor():
|
|
"""
|
|
Executes a code block with a different cursor set and makes sure the cursor
|
|
is restored even if exceptions are raised or an intermediate ``return``
|
|
statement is hit.
|
|
|
|
Example:
|
|
```
|
|
with OverrideCursor(Qt.WaitCursor):
|
|
do_a_slow(operation)
|
|
```
|
|
"""
|
|
|
|
def __init__(self, cursor):
|
|
self.cursor = cursor
|
|
|
|
def __enter__(self):
|
|
QApplication.setOverrideCursor(self.cursor)
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
QApplication.restoreOverrideCursor()
|
|
|
|
#######################
|
|
# IMPORT wrapper
|
|
|
|
|
|
_uses_builtins = True
|
|
try:
|
|
import builtins
|
|
_builtin_import = builtins.__import__
|
|
except AttributeError:
|
|
_uses_builtins = False
|
|
import __builtin__
|
|
_builtin_import = __builtin__.__import__
|
|
|
|
_plugin_modules = {}
|
|
|
|
|
|
def _import(name, globals={}, locals={}, fromlist=[], level=None):
|
|
"""
|
|
Wrapper around builtin import that keeps track of loaded plugin modules and blocks
|
|
certain unsafe imports
|
|
"""
|
|
if level is None:
|
|
level = 0
|
|
|
|
if 'PyQt4' in name:
|
|
msg = 'PyQt4 classes cannot be imported in QGIS 3.x.\n' \
|
|
'Use {} or the version independent {} import instead.'.format(name.replace('PyQt4', 'PyQt5'), name.replace('PyQt4', 'qgis.PyQt'))
|
|
raise ImportError(msg)
|
|
|
|
mod = _builtin_import(name, globals, locals, fromlist, level)
|
|
|
|
if mod and '__file__' in mod.__dict__:
|
|
module_name = mod.__name__ if fromlist else name
|
|
package_name = module_name.split('.')[0]
|
|
# check whether the module belongs to one of our plugins
|
|
if package_name in available_plugins:
|
|
if package_name not in _plugin_modules:
|
|
_plugin_modules[package_name] = set()
|
|
_plugin_modules[package_name].add(module_name)
|
|
# check the fromlist for additional modules (from X import Y,Z)
|
|
if fromlist:
|
|
for fromitem in fromlist:
|
|
frmod = module_name + "." + fromitem
|
|
if frmod in sys.modules:
|
|
_plugin_modules[package_name].add(frmod)
|
|
|
|
return mod
|
|
|
|
|
|
if not os.environ.get('QGIS_NO_OVERRIDE_IMPORT'):
|
|
if _uses_builtins:
|
|
builtins.__import__ = _import
|
|
else:
|
|
__builtin__.__import__ = _import
|
|
|
|
|
|
def run_script_from_file(filepath):
|
|
"""
|
|
Runs a Python script from a given file. Supports loading processing scripts.
|
|
:param filepath: The .py file to load.
|
|
"""
|
|
import sys
|
|
import inspect
|
|
from qgis.processing import alg
|
|
try:
|
|
from qgis.core import QgsApplication, QgsProcessingAlgorithm, QgsProcessingFeatureBasedAlgorithm
|
|
from processing.gui.AlgorithmDialog import AlgorithmDialog
|
|
_locals = {}
|
|
exec(open(filepath.replace("\\\\", "/").encode(sys.getfilesystemencoding())).read(), _locals)
|
|
alginstance = None
|
|
try:
|
|
alginstance = alg.instances.pop().createInstance()
|
|
except IndexError:
|
|
for name, attr in _locals.items():
|
|
if inspect.isclass(attr) and issubclass(attr, (QgsProcessingAlgorithm, QgsProcessingFeatureBasedAlgorithm)) and attr.__name__ not in ("QgsProcessingAlgorithm", "QgsProcessingFeatureBasedAlgorithm"):
|
|
alginstance = attr()
|
|
break
|
|
if alginstance:
|
|
alginstance.setProvider(QgsApplication.processingRegistry().providerById("script"))
|
|
alginstance.initAlgorithm()
|
|
dlg = AlgorithmDialog(alginstance)
|
|
dlg.show()
|
|
except ImportError:
|
|
pass
|