mod19: update tmpl, add maker script

Author: wescpy

Diff for: README.md

@@ -304,7 +304,7 @@ If your original app users does *not* have a user interface, i.e., mobile backen
 
 ## Accessing legacy services in second generation
 
-Many legacy App Engine first generation platform (Python 2, Java 8, PHP 5, and Go 1.11 & older) services are available ([as of Sep 2021](https://twitter.com/googledevs/status/1445916786755571712) for second generation runtimes (Python 3, Java 11, PHP 7, and Go 1.12 & newer) in a public preview. There are no videos or codelabs yet, however the Module 1 Flask migration using App Engine `ndb` [Python 2 sample ](/mod1-flask) is available in [Python 3](/mod1b-flask) if you have access. Similarly, Python 3 editions are also available for Modules 7 and 12 which add usage of App Engine `taskqueue` and `memcache`, respectively. Also see the [documentation on accessing bundled services from Python 3](https://cloud.google.com/appengine/docs/standard/python3/services/access).
+Many legacy App Engine first generation platform (Python 2, Java 8, PHP 5, and Go 1.11 & older) services are available ([as of Sep 2021](https://twitter.com/googledevs/status/1445916786755571712) for second generation runtimes (Python 3, Java 11/17, PHP 7/8, and Go 1.12 & newer) in a public preview. There are no videos or codelabs yet, however the Module 1 Flask migration using App Engine `ndb` [Python 2 sample](/mod1-flask) is available in [Python 3](/mod1b-flask) if you have access. Similarly, Python 3 editions are also available for Modules 7 and 12 which add usage of App Engine `taskqueue` and `memcache`, respectively. Also see the [documentation on accessing bundled services from Python 3](https://cloud.google.com/appengine/docs/standard/python3/services/access).
 
 
 ## References

Diff for: mod19-pubsub/maker.py

@@ -0,0 +1,44 @@
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+import google.auth
+from google.api_core import exceptions
+from google.cloud import pubsub
+
+_, PROJECT_ID = google.auth.default()
+TOPIC = 'pullq'
+SBSCR = 'worker'
+ppc_client = pubsub.PublisherClient()
+psc_client = pubsub.SubscriberClient()
+TOP_PATH = ppc_client.topic_path(PROJECT_ID, TOPIC)
+SUB_PATH = psc_client.subscription_path(PROJECT_ID, SBSCR)
+
+def make_top():
+    try:
+        top = ppc_client.create_topic(name=TOP_PATH)
+        print('Created topic %r (%s)' % (TOPIC, top.name))
+    except exceptions.AlreadyExists:
+        print('Topic %r already exists at %r' % (TOPIC, TOP_PATH))
+
+def make_sub():
+    with psc_client:
+        try:
+            sub = psc_client.create_subscription(name=SUB_PATH, topic=TOP_PATH)
+            print('Subscription created %r (%s)' % (SBSCR, sub.name))
+        except exceptions.AlreadyExists:
+            print('Subscription %r already exists at %r' % (SBSCR, SUB_PATH))
+
+make_top()
+make_sub()

Diff for: mod19-pubsub/templates/index.html

@@ -9,9 +9,13 @@ <h1>VisitMe example</h1>
 <h3>Top {{ limit }} visitors</h3>
 <table border=1 cellspacing=0 cellpadding=2>
     <tr><th>Visitor</th><th>Visits</th></tr>
-{% for count in counts %}
-    <tr><td>{{ count.visitor|e }}</td><td align="center">{{ count.counter }}</td></tr>
-{% endfor %}
+{% if counts %}
+    {% for count in counts %}
+        <tr><td>{{ count.visitor|e }}</td><td align="center">{{ count.counter }}</td></tr>
+    {% endfor %}
+{% else %}
+    <tr><td colspan=2 align="center"><i>(none yet; visit the <code>/log</code> endpoint)</i></td></tr>
+{% endif %}
 </table>
 
 <h3>Last {{ limit }} visits</h3>