Email user their OPML file when it takes >15s to export. Thanks to readerman_nb for the nudge.

apps/feed_import/tasks.py

@@ -24,3 +24,13 @@ def ProcessOPML(user_id):
 
     UserSubscription.queue_new_feeds(user)
     UserSubscription.refresh_stale_feeds(user, exclude_new=True)
+
+
+@app.task()
+def ProcessOPMLExport(user_id):
+    user = User.objects.get(pk=user_id)
+    logging.user(user, "~FR~SBOPML export (task) starting...")
+
+    user.profile.send_opml_export_email(reason="Your OPML export is ready.", force=True)
+
+    logging.user(user, "~FR~SBOPML export (task) complete: sent email to %s" % user.email)

apps/feed_import/views.py

@@ -15,13 +15,15 @@ from django.urls import reverse
 from mongoengine.errors import ValidationError
 from oauth2client.client import FlowExchangeError, OAuth2WebServerFlow
 
+from django.conf import settings
+
 from apps.feed_import.models import OAuthToken, OPMLExporter, OPMLImporter, UploadedOPML
-from apps.feed_import.tasks import ProcessOPML
+from apps.feed_import.tasks import ProcessOPML, ProcessOPMLExport
 from apps.reader.forms import SignupForm
 from apps.reader.models import UserSubscription
 from utils import json_functions as json
 from utils import log as logging
-from utils.feed_functions import TimeoutError
+from utils.feed_functions import TimeoutError, timelimit
 from utils.user_functions import ajax_login_required, get_user
 
 
@@ -86,17 +88,54 @@ def opml_export(request):
     now = datetime.datetime.now()
     if request.GET.get("user_id") and user.is_staff:
         user = User.objects.get(pk=request.GET["user_id"])
-    exporter = OPMLExporter(user)
-    opml = exporter.process()
 
-    from apps.social.models import MActivity
+    # Try to export OPML with a 15 second timeout (0.01s in dev for testing)
+    timeout_seconds = 0.01 if settings.DEBUG else 15
+    
+    @timelimit(timeout_seconds)
+    def try_opml_export():
+        exporter = OPMLExporter(user)
+        opml = exporter.process()
+        return exporter, opml
 
-    MActivity.new_opml_export(user_id=user.pk, count=exporter.feed_count)
+    try:
+        exporter, opml = try_opml_export()
 
-    response = HttpResponse(opml, content_type="text/xml; charset=utf-8")
-    response["Content-Disposition"] = "attachment; filename=NewsBlur-%s-%s.opml" % (
-        user.username,
-        now.strftime("%Y-%m-%d"),
-    )
+        from apps.social.models import MActivity
 
-    return response
+        MActivity.new_opml_export(user_id=user.pk, count=exporter.feed_count)
+
+        response = HttpResponse(opml, content_type="text/xml; charset=utf-8")
+        response["Content-Disposition"] = "attachment; filename=NewsBlur-%s-%s.opml" % (
+            user.username,
+            now.strftime("%Y-%m-%d"),
+        )
+        return response
+
+    except TimeoutError:
+        # If export takes too long, queue task to email user
+        ProcessOPMLExport.delay(user.pk)
+        logging.user(user, "~FR~SBOPML export took too long, emailing...")
+
+        # Check if this is an AJAX request
+        if request.headers.get("X-Requested-With") == "XMLHttpRequest":
+            return HttpResponse(
+                json.encode(
+                    {
+                        "code": 2,
+                        "message": "Your OPML export is being processed. You will receive an email shortly with your subscription backup.",
+                    }
+                ),
+                content_type="application/json",
+            )
+        else:
+            # Return HTML page for non-AJAX requests
+            from django.shortcuts import render
+
+            return render(
+                request,
+                "reader/opml_export_delayed.xhtml",
+                {
+                    "user": user,
+                },
+            )

templates/reader/opml_export_delayed.xhtml

@@ -0,0 +1,74 @@
+{% extends 'base.html' %}
+
+{% load utils_tags %}
+
+{% block extra_head_js %}
+    <style>
+        .NB-opml-export-delayed {
+            text-align: center;
+            padding: 100px 20px;
+            max-width: 600px;
+            margin: 0 auto;
+        }
+        
+        .NB-opml-export-delayed h1 {
+            font-size: 36px;
+            color: #282F33;
+            margin-bottom: 20px;
+            font-weight: bold;
+        }
+        
+        .NB-opml-export-delayed p {
+            font-size: 18px;
+            color: #484F53;
+            line-height: 1.6;
+            margin-bottom: 30px;
+        }
+        
+        .NB-opml-export-delayed .NB-logo {
+            margin-bottom: 40px;
+        }
+        
+        .NB-opml-export-delayed .NB-button {
+            display: inline-block;
+            padding: 12px 24px;
+            background-color: #3B7FC4;
+            color: white;
+            text-decoration: none;
+            border-radius: 4px;
+            font-size: 16px;
+            font-weight: bold;
+            transition: background-color 0.2s;
+        }
+        
+        .NB-opml-export-delayed .NB-button:hover {
+            background-color: #2968A8;
+        }
+    </style>
+{% endblock %}
+
+{% block bodyclass %}NB-opml-export-delayed{% endblock %}
+
+{% block content %}
+<div class="NB-opml-export-delayed">
+    <div class="NB-logo">
+        <img src="{{ MEDIA_URL }}img/logo_512.png" style="height: 128px;" alt="NewsBlur" />
+    </div>
+    
+    <h1>Your OPML export is being processed</h1>
+    
+    <p>
+        You have a lot of subscriptions! We're preparing your OPML export file now.
+    </p>
+    
+    <p>
+        <strong>You will receive an email shortly with your subscription backup attached.</strong>
+    </p>
+    
+    <p>
+        The email will be sent to: <strong>{{ user.email|safe }}</strong>
+    </p>
+    
+    <a href="/" class="NB-button">Return to NewsBlur</a>
+</div>
+{% endblock %}