Merge pull request #5337 from dmarteau/qgis_utils_refactoring

Disable message hook and import override at runtime

.docker/docker-compose.travis.yml

@@ -23,3 +23,6 @@ services:
       - TRAVIS_OS_NAME=${TRAVIS_OS_NAME}
       - TRAVIS_CONFIG=${TRAVIS_CONFIG}
       - TRAVIS=${TRAVIS}
+      - QGIS_DISABLE_MESSAGE_HOOKS=1
+      - QGIS_NO_OVERRIDE_IMPORT=1
+

python/plugins/processing/tests/QgisAlgorithmsTest.py

@@ -50,7 +50,7 @@ class TestAlg(QgsProcessingAlgorithm):
     def displayName(self):
         return 'testalg'
 
-    def initAlgorithm(self):
+    def initAlgorithm(self, config=None):
         pass
 
     def createInstance(self):

python/utils.py

@@ -33,6 +33,7 @@ from qgis.PyQt.QtWidgets import QPushButton, QApplication
 from qgis.core import Qgis, QgsExpression, QgsMessageLog, qgsfunction, QgsMessageOutput, QgsWkbTypes
 from qgis.gui import QgsMessageBar
 
+import os
 import sys
 import traceback
 import glob
@@ -76,7 +77,8 @@ def showWarning(message, category, filename, lineno, file=None, line=None):
     )
 
 
-warnings.showwarning = showWarning
+if not os.environ.get('QGIS_DISABLE_MESSAGE_HOOKS'):
+    warnings.showwarning = showWarning
 
 
 def showException(type, value, tb, msg, messagebar=False):
@@ -204,7 +206,8 @@ def uninstallErrorHook():
 
 
 # install error hook() on module load
-installErrorHook()
+if not os.environ.get('QGIS_DISABLE_MESSAGE_HOOKS'):
+    installErrorHook()
 
 # initialize 'iface' object
 iface = None
@@ -683,7 +686,8 @@ def _import(name, globals={}, locals={}, fromlist=[], level=None):
     return mod
 
 
-if _uses_builtins:
-    builtins.__import__ = _import
-else:
-    __builtin__.__import__ = _import
+if not os.environ.get('QGIS_NO_OVERRIDE_IMPORT'):
+    if _uses_builtins:
+        builtins.__import__ = _import
+    else:
+        __builtin__.__import__ = _import