Only use one generic function for socketio background tasks and rename the socketio event (it's no connect so don't name it like one)

app/main/events.py

@@ -5,7 +5,6 @@ from .. import db, socketio
 from ..models import User
 import json
 import jsonpatch
-import logging
 
 
 '''
@@ -24,18 +23,16 @@ def connect():
     ' will be used for further information exchange generated by a background
     ' task associated with the sid.
     '''
-    logger = logging.getLogger(__name__)
-    logger.warning('[connect] Session id is: {}.'.format(request.sid))
     socketio.start_background_task(background_task,
                                    current_app._get_current_object(),
                                    current_user.id,
                                    request.sid)
 
 
-@socketio.on('connect_admin')
+@socketio.on('inspect_user')
 @login_required
 @admin_required
-def connect_admin(selected_user_id):
+def inspect_user(user_id):
     '''
     ' The Socket.IO module creates a session id (sid) on each request. The
     ' initiating admin is automatically placed in a room with that sid, which
@@ -43,14 +40,11 @@ def connect_admin(selected_user_id):
     ' task associated with the sid. Admin will be placed in that room on emiting
     ' "conncect_admin".
     '''
-    logger = logging.getLogger(__name__)
+    socketio.start_background_task(background_task,
-    logger.warning('Admin emitted "connect_admin".')
-    logger.warning('[connect_admin] Session id is: {}.'.format(request.sid))
-    logger.warning('Selected user id is: {}'.format(selected_user_id))
-    socketio.start_background_task(background_task_foreign,
                                    current_app._get_current_object(),
-                                   selected_user_id,
+                                   user_id,
-                                   request.sid)
+                                   request.sid,
+                                   True)
 
 
 @socketio.on('disconnect')
@@ -63,7 +57,7 @@ def disconnect():
     disconnected.append(request.sid)
 
 
-def background_task(app, user_id, session_id):
+def background_task(app, user_id, session_id, foreign=False):
     '''
     ' Sends initial corpus and job lists to the client. Afterwards it checks
     ' every 3 seconds if changes to the initial values appeared. If changes are
@@ -76,18 +70,14 @@ def background_task(app, user_id, session_id):
     '''
     with app.app_context():
         user = db.session.query(User).filter_by(id=user_id).first()
-        logging.getLogger(__name__)
-        logging.warning('User object is: {}'.format(user))
         ''' Get current values from the database. '''
         corpora = user.corpora_as_dict()
-        logging.warning('Corpora are: {}'.format(corpora))
         jobs = user.jobs_as_dict()
-        logging.warning('Jobs are: {}'.format(jobs))
         ''' Send initial values. '''
-        socketio.emit('init-corpora',
+        socketio.emit('init-foreign-corpora' if foreign else 'init-corpora',
                       json.dumps(corpora),
                       room=session_id)
-        socketio.emit('init-jobs',
+        socketio.emit('init-foreign-jobs' if foreign else 'init-jobs',
                       json.dumps(jobs),
                       room=session_id)
         ''' TODO: Implement maximum runtime for this loop. '''
@@ -100,62 +90,11 @@ def background_task(app, user_id, session_id):
             jobs_patch = jsonpatch.JsonPatch.from_diff(jobs, new_jobs)
             ''' In case there are patches, send them to the user. '''
             if corpus_patch:
-                socketio.emit('update-corpora',
+                socketio.emit('update-foreign-corpora' if foreign else 'update-corpora',
                               corpus_patch.to_string(),
                               room=session_id)
             if jobs_patch:
-                socketio.emit('update-jobs',
+                socketio.emit('update-foreign-jobs' if foreign else 'update-jobs',
-                              jobs_patch.to_string(),
-                              room=session_id)
-            ''' Set new values as references for the next iteration. '''
-            corpora = new_corpora
-            jobs = new_jobs
-            socketio.sleep(3)
-    disconnected.remove(session_id)
-
-
-def background_task_foreign(app, user_id, session_id):
-    '''
-    ' Sends initial corpus and job lists to the client. Afterwards it checks
-    ' every 3 seconds if changes to the initial values appeared. If changes are
-    ' detected, a RFC 6902 compliant JSON patch gets send.
-    '
-    ' NOTE: The initial values are send as a init-* events.
-    '       The JSON patches are send as update-* events.
-    '
-    '       > where '*' is either 'corpora' or 'jobs'
-    '''
-    with app.app_context():
-        user = db.session.query(User).filter_by(id=user_id).first()
-        logging.getLogger(__name__)
-        logging.warning('User object is: {}'.format(user))
-        ''' Get current values from the database. '''
-        corpora = user.corpora_as_dict()
-        logging.warning('Corpora are: {}'.format(corpora))
-        jobs = user.jobs_as_dict()
-        logging.warning('Jobs are: {}'.format(jobs))
-        ''' Send initial values. '''
-        socketio.emit('init-foreign-corpora',
-                      json.dumps(corpora),
-                      room=session_id)
-        socketio.emit('init-foreign-jobs',
-                      json.dumps(jobs),
-                      room=session_id)
-        ''' TODO: Implement maximum runtime for this loop. '''
-        while session_id not in disconnected:
-            ''' Get current values from the database '''
-            new_corpora = user.corpora_as_dict()
-            new_jobs = user.jobs_as_dict()
-            ''' Compute JSON patches. '''
-            corpus_patch = jsonpatch.JsonPatch.from_diff(corpora, new_corpora)
-            jobs_patch = jsonpatch.JsonPatch.from_diff(jobs, new_jobs)
-            ''' In case there are patches, send them to the user. '''
-            if corpus_patch:
-                socketio.emit('update-foreign-corpora',
-                              corpus_patch.to_string(),
-                              room=session_id)
-            if jobs_patch:
-                socketio.emit('update-foreign-jobs',
                               jobs_patch.to_string(),
                               room=session_id)
             ''' Set new values as references for the next iteration. '''

app/templates/admin/admin_user_page.html.j2

@@ -35,7 +35,7 @@
 </div>
 <script>
   var selected_user_id = {{selected_user.id|tojson|safe}}
-  socket.emit('connect_admin', selected_user_id);
+  socket.emit('inspect_user', selected_user_id);
 </script>
 <div class="col s12 m6">
   <div id="job-foreign-list">