Re enabled gevent as dependency

Fix #1399 (Calibre-web starting with installed and not activated gdrive denpendencies without internet connection again)

cps/admin.py

@@ -724,7 +724,7 @@ def _configuration_result(error_flash=None, gdriveError=None):
         gdriveError = _(gdriveError)
     else:
         # if config.config_use_google_drive and\
-        if not gdrive_authenticate:
+        if not gdrive_authenticate and gdrive_support:
             gdrivefolders = gdriveutils.listRootFolders()
 
     show_back_button = current_user.is_authenticated

cps/gdriveutils.py

@@ -33,6 +33,7 @@ try:
     from pydrive.drive import GoogleDrive
     from pydrive.auth import RefreshError
     from apiclient import errors
+    from httplib2 import ServerNotFoundError
     gdrive_support = True
 except ImportError:
     gdrive_support = False
@@ -192,9 +193,13 @@ def getDrive(drive=None, gauth=None):
     return drive
 
 def listRootFolders():
-    drive = getDrive(Gdrive.Instance().drive)
-    folder = "'root' in parents and mimeType = 'application/vnd.google-apps.folder' and trashed = false"
-    fileList = drive.ListFile({'q': folder}).GetList()
+    try:
+        drive = getDrive(Gdrive.Instance().drive)
+        folder = "'root' in parents and mimeType = 'application/vnd.google-apps.folder' and trashed = false"
+        fileList = drive.ListFile({'q': folder}).GetList()
+    except ServerNotFoundError as e:
+        log.info("GDrive Error %s" % e)
+        fileList = []
     return fileList
 
 

optional-requirements.txt

@@ -1,6 +1,6 @@
 # GDrive Integration
 google-api-python-client==1.7.11,<1.8.0
-#gevent>=1.2.1,<20.6.0
+gevent>=1.2.1,<20.6.0
 greenlet>=0.4.12,<0.5.0
 httplib2>=0.9.2,<0.18.0
 oauth2client>=4.0.0,<4.1.4