(screams) the time is nigh

model.py

@@ -77,6 +77,20 @@ class Account(TimestampMixin, RemoteIDMixin):
     def post_count(self):
         return Post.query.with_parent(self).count()
 
+    def estimate_eligible_for_delete(self):
+        """
+        this is an estimation because we do not know if favourite status has changed since last time a post was refreshed
+        and it is unfeasible to refresh every single post every time we need to know how many posts are eligible to delete
+        """
+        latest_n_posts = db.session.query(Post.id).with_parent(self).order_by(db.desc(Post.created_at)).limit(self.policy_keep_latest)
+        query = Post.query.with_parent(self).\
+            filter(Post.created_at + self.policy_keep_younger <= db.func.now()).\
+            filter(~Post.id.in_(latest_n_posts))
+        if(self.policy_keep_favourites):
+            query = query.filter_by(favourite = False)
+        return query.count()
+
+
 
 
 class Account(Account, db.Model):

routes.py

@@ -1,6 +1,6 @@
 from app import app
 from flask import render_template, url_for, redirect, request, g, Response
-from datetime import datetime
+from datetime import datetime, timedelta
 import lib.twitter
 import lib
 from lib import require_auth
@@ -101,6 +101,20 @@ def enable():
     # i.e. about to instantly delete a lot of posts,
     # or when enabling for the first time (last_delete is >1 year in the past)
 
+    risky = False
+    if not 'confirm' in request.form and not g.viewer.account.policy_enabled:
+        if g.viewer.account.policy_delete_every == timedelta(0):
+            approx = g.viewer.account.estimate_eligible_for_delete()
+            return render_template('warn.html', message=f"""You've set the time between deleting posts to 0. Every post that matches your expiration rules will be deleted within minutes.
+                    { ("That's about " + str(approx) + " posts.") if approx > 0 else "" }
+                    Go ahead?""")
+        if g.viewer.account.last_delete < datetime.now() - timedelta(days=365):
+            return render_template('warn.html', message="""Once you enable Forget, posts that match your expiration rules will be deleted <b>permanently</b>. We can't bring them back. Make sure that you won't miss them.""")
+
+
+    if not g.viewer.account.policy_enabled:
+        g.viewer.account.last_delete = db.func.now()
+
     g.viewer.account.policy_enabled = True
     db.session.commit()
 

static/style.css

@@ -106,3 +106,7 @@ body > section > .banner {
 .banner form {
     display: inline;
 }
+
+label {
+    display: inline-block;
+}

tasks.py

@@ -123,8 +123,8 @@ def delete_from_account(account_id):
         filter(~Post.id.in_(latest_n_posts)).\
         order_by(db.func.random()).limit(100).all()
 
+    posts = refresh_account(account_id)
     if account.service == 'twitter':
-        posts = lib.twitter.refresh_posts(posts)
         eligible = list((post for post in posts if not account.policy_keep_favourites or not post.favourite))
         if eligible:
             if account.policy_delete_every == timedelta(0):
@@ -139,9 +139,39 @@ def delete_from_account(account_id):
 
     db.session.commit()
 
+def refresh_posts(posts):
+    posts = list(posts)
+    if len(posts) == 0:
+        return []
+
+    if posts[0].service == 'twitter':
+        return lib.twitter.refresh_posts(posts)
+
+@app.task
+def refresh_account(account_id):
+    account = Account.query.get(account_id)
+
+    oldest_post = Post.query.with_parent(account).order_by(db.asc(Post.updated_at)).first()
+
+    if not oldest_post:
+        return []
+
+    posts = Post.query.with_parent(account).filter(Post.id != oldest_post.id).order_by(db.func.random()).limit(99).all()
+    posts.append(oldest_post)
+
+    posts = refresh_posts(posts)
+    db.session.commit()
+    return posts
+
+@app.task
+def refresh_account_with_oldest_post():
+    post = Post.query.options(db.joinedload(Post.author)).order_by(db.asc(Post.updated_at)).first()
+    return refresh_account(post.author_id)
+
 app.add_periodic_task(6*60*60, periodic_cleanup)
 app.add_periodic_task(45, queue_fetch_for_most_stale_accounts)
 app.add_periodic_task(45, queue_deletes)
+app.add_periodic_task(30*60, refresh_account_with_oldest_post)
 
 if __name__ == '__main__':
     app.worker_main()

templates/logged_in.html

@@ -21,7 +21,7 @@
 {% endif %}
 </div>
 {% set post_count = g.viewer.account.post_count() %}
-<p>Currently keeping track of {{ post_count }} posts</p>
+<p>Currently keeping track of {{ post_count }} of your posts, roughly {{ g.viewer.account.estimate_eligible_for_delete() }} of which currently match your expiration rules.</p>
 {% if g.viewer.account.service == 'twitter'
         and post_count < g.viewer.account.reported_post_count * 3/4
         and g.viewer.account.reported_post_count > 3200 -%}
@@ -37,21 +37,21 @@
 {% endif %}
 
 <form action='{{url_for("settings")}}' method='post' enctype='multipart/form-data'>
-<p>Delete one post every
-    {{interval_input(g.viewer.account, 'policy_delete_every', scales)}}
-</p>
-<p>Keep posts less than
+<p>Posts that are less than
     {{interval_input(g.viewer.account, 'policy_keep_younger', scales)}}
-    old
+    old are considered fresh
 </p>
-<p>Keep my
+<p>Your latest
     <input type=number name=policy_keep_latest min=0 step=1 style='max-width:8ch' value={{g.viewer.account.policy_keep_latest}}>
-    latest posts
+    posts are considered fresh
 </p>
-<p>Keep posts that I have favourited
+<p>Posts that you have given a like to stay fresh forever
     <label><input type=radio name=policy_keep_favourites value=true {{ "checked" if g.viewer.account.policy_keep_favourites }}> Yes</label>
     <label><input type=radio name=policy_keep_favourites value=false {{ "checked" if not g.viewer.account.policy_keep_favourites }}> No</label>
 </p>
+<p>Any post that is not kept fresh by any of these rules is considered expired. One random expired post will be deleted every
+    {{interval_input(g.viewer.account, 'policy_delete_every', scales)}}
+</p>
 <input type=submit value='Save settings'>
 </form>
 

templates/warn.html

@@ -0,0 +1,20 @@
+{% extends 'lib/layout.html' %}
+{% block body %}
+<section>
+    <h2>Ahhhh (dats me yellin)</h2>
+
+<div class="banner warning">
+    <p>{{message|safe}}</p>
+
+    <div>
+        <form method='post'>
+            <input name='confirm' value='Do it' type='submit'/>
+        </form>
+        <form action='{{url_for("index")}}'>
+            <input name='confirm' value='Cancel' type='submit'/>
+        </form>
+    </div>
+
+</div>
+</section>
+{% endblock %}