Catch some errors related to non writable settings db

cps/admin.py

@@ -34,7 +34,7 @@ from flask import Blueprint, flash, redirect, url_for, abort, request, make_resp
 from flask_login import login_required, current_user, logout_user
 from flask_babel import gettext as _
 from sqlalchemy import and_
-from sqlalchemy.exc import IntegrityError
+from sqlalchemy.exc import IntegrityError, OperationalError, InvalidRequestError
 from sqlalchemy.sql.expression import func
 
 from . import constants, logger, helper, services
@@ -615,6 +615,7 @@ def _configuration_update_helper():
     to_save = request.form.to_dict()
 
     to_save['config_calibre_dir'] = re.sub('[\\/]metadata\.db$', '', to_save['config_calibre_dir'], flags=re.IGNORECASE)
+    try:
         db_change |= _config_string(to_save, "config_calibre_dir")
 
         # Google drive setup
@@ -654,6 +655,7 @@ def _configuration_update_helper():
             reboot_required |= reboot
 
         # Remote login configuration
+
         _config_checkbox(to_save, "config_remote_login")
         if not config.config_remote_login:
             ub.session.query(ub.RemoteAuthToken).filter(ub.RemoteAuthToken.token_type==0).delete()
@@ -687,6 +689,9 @@ def _configuration_update_helper():
             unrar_status = helper.check_unrar(config.config_rarfile_location)
             if unrar_status:
                 return _configuration_result(unrar_status, gdriveError)
+    except (OperationalError, InvalidRequestError):
+        ub.session.rollback()
+        _configuration_result(_(u"Settings DB is not Writeable"), gdriveError)
 
     try:
         metadata_db = os.path.join(config.config_calibre_dir, "metadata.db")
@@ -783,6 +788,9 @@ def _handle_new_user(to_save, content,languages, translations, kobo_support):
     except IntegrityError:
         ub.session.rollback()
         flash(_(u"Found an existing account for this e-mail address or nickname."), category="error")
+    except OperationalError:
+        ub.session.rollback()
+        flash(_(u"Settings DB is not Writeable"), category="error")
 
 
 def _handle_edit_user(to_save, content,languages, translations, kobo_support, downloads):
@@ -872,6 +880,9 @@ def _handle_edit_user(to_save, content,languages, translations, kobo_support, do
     except IntegrityError:
         ub.session.rollback()
         flash(_(u"An unknown error occured."), category="error")
+    except OperationalError:
+        ub.session.rollback()
+        flash(_(u"Settings DB is not Writeable"), category="error")
 
 
 @admi.route("/admin/user/new", methods=["GET", "POST"])
@@ -916,7 +927,12 @@ def update_mailsettings():
     _config_string(to_save, "mail_password")
     _config_string(to_save, "mail_from")
     _config_int(to_save, "mail_size", lambda y: int(y)*1024*1024)
+    try:
         config.save()
+    except (OperationalError, InvalidRequestError):
+        ub.session.rollback()
+        flash(_(u"Settings DB is not Writeable"), category="error")
+        return edit_mailsettings()
 
     if to_save.get("test"):
         if current_user.email:

cps/services/simpleldap.py

@@ -64,7 +64,6 @@ def init_app(app, config):
     app.config['LDAP_OPENLDAP'] = bool(config.config_ldap_openldap)
     app.config['LDAP_GROUP_OBJECT_FILTER'] = config.config_ldap_group_object_filter
     app.config['LDAP_GROUP_MEMBERS_FIELD'] = config.config_ldap_group_members_field
-    # app.config['LDAP_CUSTOM_OPTIONS'] = {'OPT_NETWORK_TIMEOUT': 10}
 
     _ldap.init_app(app)
 

cps/shelf.py

@@ -27,8 +27,9 @@ from flask import Blueprint, request, flash, redirect, url_for
 from flask_babel import gettext as _
 from flask_login import login_required, current_user
 from sqlalchemy.sql.expression import func
+from sqlalchemy.exc import OperationalError, InvalidRequestError
 
-from . import logger, ub, searched_ids, db, calibre_db
+from . import logger, ub, searched_ids, calibre_db
 from .web import render_title_template
 
 
@@ -91,8 +92,16 @@ def add_to_shelf(shelf_id, book_id):
 
     shelf.books.append(ub.BookShelf(shelf=shelf.id, book_id=book_id, order=maxOrder + 1))
     shelf.last_modified = datetime.utcnow()
+    try:
         ub.session.merge(shelf)
         ub.session.commit()
+    except (OperationalError, InvalidRequestError):
+        ub.session.rollback()
+        flash(_(u"Settings DB is not Writeable"), category="error")
+        if "HTTP_REFERER" in request.environ:
+            return redirect(request.environ["HTTP_REFERER"])
+        else:
+            return redirect(url_for('web.index'))
     if not xhr:
         flash(_(u"Book has been added to shelf: %(sname)s", sname=shelf.name), category="success")
         if "HTTP_REFERER" in request.environ:
@@ -143,9 +152,13 @@ def search_to_shelf(shelf_id):
             maxOrder = maxOrder + 1
             shelf.books.append(ub.BookShelf(shelf=shelf.id, book_id=book, order=maxOrder))
         shelf.last_modified = datetime.utcnow()
+        try:
             ub.session.merge(shelf)
             ub.session.commit()
             flash(_(u"Books have been added to shelf: %(sname)s", sname=shelf.name), category="success")
+        except (OperationalError, InvalidRequestError):
+            ub.session.rollback()
+            flash(_(u"Settings DB is not Writeable"), category="error")
     else:
         flash(_(u"Could not add books to shelf: %(sname)s", sname=shelf.name), category="error")
     return redirect(url_for('web.index'))
@@ -180,10 +193,17 @@ def remove_from_shelf(shelf_id, book_id):
                 return redirect(url_for('web.index'))
             return "Book already removed from shelf", 410
 
+        try:
             ub.session.delete(book_shelf)
             shelf.last_modified = datetime.utcnow()
             ub.session.commit()
-
+        except (OperationalError, InvalidRequestError):
+            ub.session.rollback()
+            flash(_(u"Settings DB is not Writeable"), category="error")
+            if "HTTP_REFERER" in request.environ:
+                return redirect(request.environ["HTTP_REFERER"])
+            else:
+                return redirect(url_for('web.index'))
         if not xhr:
             flash(_(u"Book has been removed from shelf: %(sname)s", sname=shelf.name), category="success")
             if "HTTP_REFERER" in request.environ:
@@ -235,7 +255,11 @@ def create_shelf():
                 ub.session.commit()
                 flash(_(u"Shelf %(title)s created", title=to_save["title"]), category="success")
                 return redirect(url_for('shelf.show_shelf', shelf_id=shelf.id))
+            except (OperationalError, InvalidRequestError):
+                ub.session.rollback()
+                flash(_(u"Settings DB is not Writeable"), category="error")
             except Exception:
+                ub.session.rollback()
                 flash(_(u"There was an error"), category="error")
         return render_title_template('shelf_edit.html', shelf=shelf, title=_(u"Create a Shelf"), page="shelfcreate")
     else:
@@ -280,7 +304,11 @@ def edit_shelf(shelf_id):
             try:
                 ub.session.commit()
                 flash(_(u"Shelf %(title)s changed", title=to_save["title"]), category="success")
+            except (OperationalError, InvalidRequestError):
+                ub.session.rollback()
+                flash(_(u"Settings DB is not Writeable"), category="error")
             except Exception:
+                ub.session.rollback()
                 flash(_(u"There was an error"), category="error")
         return render_title_template('shelf_edit.html', shelf=shelf, title=_(u"Edit a shelf"), page="shelfedit")
     else:
@@ -298,11 +326,16 @@ def delete_shelf_helper(cur_shelf):
     log.info("successfully deleted %s", cur_shelf)
 
 
+
 @shelf.route("/shelf/delete/<int:shelf_id>")
 @login_required
 def delete_shelf(shelf_id):
     cur_shelf = ub.session.query(ub.Shelf).filter(ub.Shelf.id == shelf_id).first()
+    try:
         delete_shelf_helper(cur_shelf)
+    except (OperationalError, InvalidRequestError):
+        ub.session.rollback()
+        flash(_(u"Settings DB is not Writeable"), category="error")
     return redirect(url_for('web.index'))
 
 
@@ -327,8 +360,12 @@ def show_shelf(shelf_type, shelf_id):
                 cur_book = calibre_db.get_book(book.book_id)
                 if not cur_book:
                     log.info('Not existing book %s in %s deleted', book.book_id, shelf)
+                    try:
                         ub.session.query(ub.BookShelf).filter(ub.BookShelf.book_id == book.book_id).delete()
                         ub.session.commit()
+                    except (OperationalError, InvalidRequestError):
+                        ub.session.rollback()
+                        flash(_(u"Settings DB is not Writeable"), category="error")
         return render_title_template(page, entries=result, title=_(u"Shelf: '%(name)s'", name=shelf.name),
                                      shelf=shelf, page="shelf")
     else:
@@ -348,7 +385,11 @@ def order_shelf(shelf_id):
             setattr(book, 'order', to_save[str(book.book_id)])
             counter += 1
             # if order diffrent from before -> shelf.last_modified = datetime.utcnow()
+        try:
             ub.session.commit()
+        except (OperationalError, InvalidRequestError):
+            ub.session.rollback()
+            flash(_(u"Settings DB is not Writeable"), category="error")
 
     shelf = ub.session.query(ub.Shelf).filter(ub.Shelf.id == shelf_id).first()
     result = list()

cps/ub.py

@@ -19,6 +19,7 @@
 
 from __future__ import division, print_function, unicode_literals
 import os
+import sys
 import datetime
 import itertools
 import uuid
@@ -603,9 +604,13 @@ def migrate_Database(session):
         session.commit()
 
     # Remove login capability of user Guest
+    try:
         conn = engine.connect()
         conn.execute("UPDATE user SET password='' where nickname = 'Guest' and password !=''")
         session.commit()
+    except exc.OperationalError:
+        print('Settings database is not writeable. Exiting...')
+        sys.exit(1)
 
 
 def clean_database(session):