def get_qgs_project(path):
"""Reads and returns a project from the cache, trying to load it
if it's not there.
A None is returned if the project could not be loaded.
:param path: the filesystem path to the project
:type path: str
:return: the QgsProject instance or None
:rtype: QgsProject or None
"""
try:
# Call process events in case the project has been updated and the cache
# needs rebuilt
QgsApplication.instance().processEvents()
project = QgsConfigCache.instance().project(path, QGS_SERVER_SETTINGS)
# This is required after QGIS 3.10.11, see https://github.com/qgis/QGIS/pull/38488#issuecomment-692190106
if project is not None and project != QgsProject.instance():
try:
QgsProject.setInstance(project)
except AttributeError: # Temporary workaround for 3.10.10
QgsProject.instance().read(path)
return project
except:
logger.warning(
'There was an error loading the project from path: %s, this is normally due to unavailable layers. If this is unexpected, please turn on and check server debug logs for further details.'
% path)
return None
def get_qgs_project(path):
"""Reads and returns a project from the cache, trying to load it
if it's not there.
A None is returned if the project could not be loaded.
:param path: the filesystem path to the project
:type path: str
:return: the QgsProject instance or None
:rtype: QgsProject or None
"""
try:
# Call process events in case the project has been updated and the cache
# needs rebuilt. This triggers the QGIS server internal cache manager that
# invalidates the cache if the file has changed. QGIS internal implementation
# does not work reliably with project that are stored on network mounted
# volumes, in that case we need to use our own cache manager, enable it with
# G3WADMIN_USE_CUSTOM_CACHE_INVALIDATOR=True
QgsApplication.instance().processEvents()
if USE_CUSTOM_CACHE_INVALIDATOR:
ProjectCacheInvalidator.check_cache(path)
project = QgsConfigCache.instance().project(path, QGS_SERVER_SETTINGS)
# This is required after QGIS 3.10.11, see https://github.com/qgis/QGIS/pull/38488#issuecomment-692190106
if project is not None and project != QgsProject.instance():
try:
# Workaround for virtual layers bug https://github.com/qgis/QGIS/pull/38488#issuecomment-692190106
QgsProject.setInstance(project)
needs_reload = False
for l in list(project.mapLayers().values()):
if not l.isValid():
logger.warning('Invalid layer %s found in project %s' %
(l.id(), project.fileName()))
if l.dataProvider().name() == 'virtual':
needs_reload = True
logger.warning(
'Invalid virtual layer found in project %s: %s'
% (project.fileName(), l.publicSource()))
if needs_reload:
logger.warning('Reload project %s' % project.fileName())
QgsProject.instance().read(path)
except AttributeError: # Temporary workaround for 3.10.10
logger.warning(
'Project reloaded because QgsProject.setInstance() is not available in this QGIS version: %s'
% path)
QgsProject.instance().read(path)
return QgsProject.instance()
except Exception as ex:
logger.warning(
'There was an error loading the project from path: %s, this is normally due to unavailable layers. If this is unexpected, please turn on and check server debug logs for further details.\n%s.'
% (path, ex))
return None