Refactoring taskqueue sample

Change-Id: I1c78d57979bde942c5a5a6b232ef87cca10944b2

appengine/taskqueue/counter/README.md

@@ -1,5 +1,13 @@
 # App Engine Task Queue Counter
 
+To run this app locally, specify both `.yaml` files to `dev_appserver.py`:
+
+    dev_appserver.py -A your-app-id application.yaml worker.yaml
+
+To deploy this application, specify both `.yaml` files to `appcfg.py`:
+
+    appcfg.py update -A your-app-id -V 1 application.yaml worker.yaml
+
 <!-- auto-doc-link -->
 These samples are used on the following documentation page:
 

appengine/taskqueue/counter/application.py

@@ -0,0 +1,74 @@
+# Copyright 2016 Google Inc. All rights reserved.
+#
+# 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 google.appengine.api import taskqueue
+from google.appengine.ext import ndb
+import webapp2
+
+
+COUNTER_KEY = 'default counter'
+
+
+class Counter(ndb.Model):
+    count = ndb.IntegerProperty(indexed=False)
+
+
+class MainPageHandler(webapp2.RequestHandler):
+    def get(self):
+        counter = Counter.get_by_id(COUNTER_KEY)
+        count = counter.count if counter else 0
+
+        self.response.write("""
+            Count: {count}<br>
+            <form method="post" action="/enqueue">
+                <label>Increment amount</label>
+                <input name="amount" value="1">
+                <button>Enqueue task</button>
+            </form>
+        """.format(count=count))
+
+
+class EnqueueTaskHandler(webapp2.RequestHandler):
+    def post(self):
+        amount = int(self.request.get('amount'))
+
+        task = taskqueue.add(
+            url='/update_counter',
+            target='worker',
+            params={'amount': amount})
+
+        self.response.write(
+            'Task {} enqueued, ETA {}.'.format(task.name, task.eta))
+
+
+class AsyncEnqueueTaskHandler(webapp2.RequestHandler):
+    def post(self):
+        amount = int(self.request.get('amount'))
+
+        future = taskqueue.add_async(
+            url='/update_counter',
+            target='worker',
+            params={'amount': amount})
+
+        task = future.wait()
+
+        self.response.write(
+            'Task {} enqueued, ETA {}.'.format(task.name, task.eta))
+
+
+app = webapp2.WSGIApplication([
+    ('/', MainPageHandler),
+    ('/enqueue', EnqueueTaskHandler),
+    ('/enqueue_async', EnqueueTaskHandler)
+], debug=True)

appengine/taskqueue/counter/app.yaml → appengine/taskqueue/counter/application.yaml

@@ -1,11 +1,8 @@
 runtime: python27
 api_version: 1
 threadsafe: true
+module: default
 
 handlers:
 - url: /.*
-  script: main.app
-
-libraries:
-- name: jinja2
-  version: 2.6
+  script: application.app

appengine/taskqueue/counter/counter_test.py → appengine/taskqueue/counter/application_test.py

@@ -12,18 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from google.appengine.ext import ndb
-import main
+import application
 import webtest
+import worker
 
 
-def test_app(testbed, run_tasks):
-    key_name = 'foo'
+def test_all(testbed, run_tasks):
+    test_app = webtest.TestApp(application.app)
+    test_worker = webtest.TestApp(worker.app)
 
-    app = webtest.TestApp(main.app)
-    app.post('/', {'key': key_name})
-    run_tasks(app)
+    response = test_app.get('/')
+    assert '0' in response.body
 
-    key = ndb.Key('Counter', key_name)
-    counter = key.get()
-    assert counter.count == 1
+    test_app.post('/enqueue', {'amount': 5})
+    run_tasks(test_worker)
+
+    response = test_app.get('/')
+    assert '5' in response.body

appengine/taskqueue/counter/queue.yaml

@@ -1,4 +1,4 @@
 queue:
-# Change the refresh rate of the default queue from 5/s to 1/s
+# Change the refresh rate of the default queue from 5/s to 1/s.
 - name: default
   rate: 1/s

appengine/taskqueue/counter/worker.py

@@ -0,0 +1,44 @@
+# Copyright 2016 Google Inc. All rights reserved.
+#
+# 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 google.appengine.ext import ndb
+import webapp2
+
+
+COUNTER_KEY = 'default counter'
+
+
+class Counter(ndb.Model):
+    count = ndb.IntegerProperty(indexed=False)
+
+
+class UpdateCounterHandler(webapp2.RequestHandler):
+    def post(self):
+        amount = int(self.request.get('amount'))
+
+        # This task should run at most once per second because of the datastore
+        # transaction write throughput.
+        @ndb.transactional
+        def update_counter():
+            counter = Counter.get_or_insert(COUNTER_KEY, count=0)
+            counter.count += amount
+            counter.put()
+
+        update_counter()
+
+
+app = webapp2.WSGIApplication([
+    ('/update_counter', UpdateCounterHandler)
+], debug=True)
+# [END all]

appengine/taskqueue/counter/worker.yaml

@@ -0,0 +1,8 @@
+runtime: python27
+api_version: 1
+threadsafe: true
+module: worker
+
+handlers:
+- url: /.*
+  script: worker.app