Adding a cron job and a new workload for it.

src/pingjob/Dockerfile

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+FROM python:3-slim as base
+
+FROM base as builder
+
+RUN apt-get -qq update \
+    && apt-get install -y --no-install-recommends \
+        g++
+
+COPY requirements.txt .
+
+RUN pip install --install-option="--prefix=/install" -r requirements.txt
+
+FROM base
+COPY --from=builder /install /usr/local
+
+COPY . .
+ENTRYPOINT ["./pinger.sh"]
+

src/pingjob/pinger.py

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+#!/usr/bin/python
+#
+# Copyright 2018 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.
+
+import random
+
+import requests
+import sys
+
+BASE = sys.argv[1]
+
+products = [
+    '0PUK6V6EV0',
+    '1YMWWN1N4O',
+    '2ZYFJ3GM2N',
+    '66VCHSJNUP',
+    '6E92ZMYYFZ',
+    '9SIQT8TOJO',
+    'L9ECAV7KIM',
+    'LS4PSXUNUM',
+    'OLJCESPC7Z']
+
+
+def index():
+  requests.get(BASE + "/")
+
+
+def setCurrency():
+  currencies = ['EUR', 'USD', 'JPY', 'CAD']
+  requests.post(BASE + "/setCurrency",
+                {'currency_code': random.choice(currencies)})
+
+
+def browseProduct():
+  requests.get(BASE + "/product/" + random.choice(products))
+
+
+def viewCart():
+  requests.get(BASE + "/cart")
+
+
+def addToCart():
+  product = random.choice(products)
+  requests.get(BASE + "/product/" + product)
+  requests.post(BASE + "/cart", {
+      'product_id': product,
+      'quantity': random.choice([1, 2, 3, 4, 5, 10])})
+
+
+def checkout():
+  addToCart()
+  requests.post(BASE + "/cart/checkout", {
+      'email': 'someone@example.com',
+      'street_address': '1600 Amphitheatre Parkway',
+      'zip_code': '94043',
+      'city': 'Mountain View',
+      'state': 'CA',
+      'country': 'United States',
+      'credit_card_number': '4432-8015-6152-0454',
+      'credit_card_expiration_month': '1',
+      'credit_card_expiration_year': '2039',
+      'credit_card_cvv': '672',
+  })
+
+
+if not BASE:
+  print("ERROR: no frontend address")
+else:
+  print("pinging" + BASE)
+index()
+browseProduct()
+addToCart()
+viewCart()
+checkout()

src/pingjob/pinger.sh

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+#!/bin/sh -eu
+#
+# Copyright 2018 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.
+
+#!/bin/bash
+set -e
+trap "exit" TERM
+
+if [ -z "${FRONTEND_ADDR}" ]; then
+    echo >&2 "FRONTEND_ADDR not specified"
+    exit 1
+fi
+
+set -x
+python pinger.py "${FRONTEND_ADDR}"

src/pingjob/requirements.in

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+requests

src/pingjob/requirements.txt

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+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --output-file=requirements.txt requirements.in
+#
+certifi==2018.11.29       # via requests
+chardet==3.0.4            # via requests
+idna==2.8                 # via requests
+requests==2.21.0
+urllib3==1.24.1           # via requests