Additional fix for #1407 (metadata.db is now held in memory, app.db is attached to it -> joins between both databases possible -> book_read_link is joined for getting result)

cps/__init__.py

@@ -98,7 +98,7 @@ def create_app():
     app.secret_key = os.getenv('SECRET_KEY', config_sql.get_flask_session_key(ub.session))
 
     web_server.init_app(app, config)
-    db.setup_db(config)
+    db.setup_db(config, cli.settingspath)
 
     babel.init_app(app)
     _BABEL_TRANSLATIONS.update(str(item) for item in babel.list_translations())

cps/admin.py

@@ -99,7 +99,7 @@ def shutdown():
 
     if task == 2:
         log.warning("reconnecting to calibre database")
-        db.setup_db(config)
+        db.setup_db(config, ub.app_DB_path)
         showtext['text'] = _(u'Reconnect successful')
         return json.dumps(showtext)
 
@@ -688,7 +688,7 @@ def _configuration_update_helper():
         return _configuration_result('%s' % e, gdriveError)
 
     if db_change:
-        if not db.setup_db(config):
+        if not db.setup_db(config, ub.app_DB_path):
             return _configuration_result(_('DB Location is not Valid, Please Enter Correct Path'), gdriveError)
         if not os.access(os.path.join(config.config_calibre_dir, "metadata.db"), os.W_OK):
             flash(_(u"DB is not Writeable"), category="warning")

cps/db.py

@@ -24,7 +24,7 @@ import re
 import ast
 from datetime import datetime
 
-from sqlalchemy import create_engine
+from sqlalchemy import create_engine, event
 from sqlalchemy import Table, Column, ForeignKey, CheckConstraint
 from sqlalchemy import String, Integer, Boolean, TIMESTAMP, Float
 from sqlalchemy.orm import relationship, sessionmaker, scoped_session
@@ -329,7 +329,7 @@ def update_title_sort(config, conn=None):
     conn.create_function("title_sort", 1, _title_sort)
 
 
-def setup_db(config):
+def setup_db(config, app_db_path):
     dispose()
     global engine
 
@@ -343,10 +343,14 @@ def setup_db(config):
         return False
 
     try:
-        engine = create_engine('sqlite:///{0}'.format(dbpath),
+        #engine = create_engine('sqlite:///{0}'.format(dbpath),
+        engine = create_engine('sqlite://',
                                echo=False,
                                isolation_level="SERIALIZABLE",
                                connect_args={'check_same_thread': False})
+        engine.execute("attach database '{}' as calibre;".format(dbpath))
+        engine.execute("attach database '{}' as app_settings;".format(app_db_path))
+
         conn = engine.connect()
         # conn.text_factory = lambda b: b.decode(errors = 'ignore') possible fix for #1302
     except Exception as e:
@@ -438,7 +442,8 @@ def dispose():
             if table is not None:
                 Base.metadata.remove(table)
 
-def reconnect_db(config):
+
+def reconnect_db(config, app_db_path):
     session.close()
     engine.dispose()
-    setup_db(config)
+    setup_db(config, app_db_path)

cps/gdrive.py

@@ -39,7 +39,7 @@ try:
 except ImportError:
     pass
 
-from . import logger, gdriveutils, config, db
+from . import logger, gdriveutils, config, db, ub
 from .web import admin_required
 
 
@@ -145,7 +145,8 @@ def on_received_watch_confirmation():
                         dbpath = os.path.join(config.config_calibre_dir, "metadata.db")
                     else:
                         dbpath = os.path.join(config.config_calibre_dir, "metadata.db").encode()
-                    if not response['deleted'] and response['file']['title'] == 'metadata.db' and response['file']['md5Checksum'] != hashlib.md5(dbpath):
+                    if not response['deleted'] and response['file']['title'] == 'metadata.db' \
+                       and response['file']['md5Checksum'] != hashlib.md5(dbpath):
                         tmpDir = tempfile.gettempdir()
                         log.info('Database file updated')
                         copyfile(dbpath, os.path.join(tmpDir, "metadata.db_" + str(current_milli_time())))
@@ -154,7 +155,7 @@ def on_received_watch_confirmation():
                         log.info('Setting up new DB')
                         # prevent error on windows, as os.rename does on exisiting files
                         move(os.path.join(tmpDir, "tmp_metadata.db"), dbpath)
-                        db.setup_db(config)
+                        db.setup_db(config, ub.app_DB_path)
             except Exception as e:
                 log.exception(e)
         updateMetaData()

cps/kobo.py

@@ -143,7 +143,7 @@ def HandleSyncRequest():
 
     # We reload the book database so that the user get's a fresh view of the library
     # in case of external changes (e.g: adding a book through Calibre).
-    db.reconnect_db(config)
+    db.reconnect_db(config, ub.app_DB_path)
 
     archived_books = (
         ub.session.query(ub.ArchivedBook)

cps/ub.py

@@ -49,6 +49,7 @@ from . import constants
 
 
 session = None
+app_DB_path = None
 Base = declarative_base()
 
 
@@ -664,8 +665,12 @@ def create_admin_user(session):
 def init_db(app_db_path):
     # Open session for database connection
     global session
+    global app_DB_path
 
+    app_DB_path = app_db_path
     engine = create_engine(u'sqlite:///{0}'.format(app_db_path), echo=False)
+    # engine.execute("attach database '{0}' as app_settings;".format(app_db_path))
+
 
     Session = sessionmaker()
     Session.configure(bind=engine)

cps/web.py

@@ -970,7 +970,7 @@ def get_tasks_status():
 
 @app.route("/reconnect")
 def reconnect():
-    db.reconnect_db(config)
+    db.reconnect_db(config, ub.app_DB_path)
     return json.dumps({})
 
 
@@ -1154,30 +1154,33 @@ def advanced_search():
 def render_read_books(page, are_read, as_xml=False, order=None, *args, **kwargs):
     order = order or []
     if not config.config_read_column:
-        readBooks = ub.session.query(ub.ReadBook).filter(ub.ReadBook.user_id == int(current_user.id))\
-            .filter(ub.ReadBook.read_status == ub.ReadBook.STATUS_FINISHED).all()
-        readBookIds = [x.book_id for x in readBooks]
         if are_read:
-            db_filter = db.Books.id.in_(readBookIds)
+            db_filter = and_(ub.ReadBook.user_id == int(current_user.id),
+                             ub.ReadBook.read_status == ub.ReadBook.STATUS_FINISHED)
         else:
-            db_filter = ~db.Books.id.in_(readBookIds)
+            db_filter = coalesce(ub.ReadBook.read_status, 0) != ub.ReadBook.STATUS_FINISHED
-        entries, random, pagination = fill_indexpage(page, db.Books, db_filter, order)
+        entries, random, pagination = fill_indexpage(page, db.Books,
+                                                     db_filter,
+                                                     order,
+                                                     ub.ReadBook, db.Books.id==ub.ReadBook.book_id)
     else:
         try:
             if are_read:
                 db_filter = db.cc_classes[config.config_read_column].value == True
             else:
                 db_filter = coalesce(db.cc_classes[config.config_read_column].value, False) != True
-            # book_count = db.session.query(func.count(db.Books.id)).filter(common_filters()).filter(db_filter).scalar()
             entries, random, pagination = fill_indexpage(page, db.Books,
                                                          db_filter,
                                                          order,
                                                          db.cc_classes[config.config_read_column])
         except KeyError:
             log.error("Custom Column No.%d is not existing in calibre database", config.config_read_column)
-            book_count = 0
+            if not as_xml:
-
+                flash(_("Custom Column No.%(column)d is not existing in calibre database",
-
+                        column=config.config_read_column),
+                      category="error")
+                return redirect(url_for("web.index"))
+            # ToDo: Handle error Case for opds
     if as_xml:
         return entries, pagination
     else: