Added code

Dockerfile

+# Copyright 2020 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 python:3.7-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 --prefix="/install" -r requirements.txt
+
+FROM base
+COPY --from=builder /install /usr/local
+
+COPY . .
+RUN chmod +x ./loadgen.sh
+RUN apt-get -qq update \
+    && apt-get install -y --no-install-recommends \
+        curl
+ENTRYPOINT ./loadgen.sh

loadgen.sh

+#!/bin/bash
+#
+# 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.
+
+set -e
+trap "exit" TERM
+
+if [[ -z "${FRONTEND_ADDR}" ]]; then
+    echo >&2 "FRONTEND_ADDR not specified"
+    exit 1
+fi
+
+set -x
+
+# if one request to the frontend fails, then exit
+STATUSCODE=$(curl --silent --output /dev/stderr --write-out "%{http_code}" http://${FRONTEND_ADDR})
+if test $STATUSCODE -ne 200; then
+    echo "Error: Could not reach frontend - Status code: ${STATUSCODE}"
+    exit 1
+fi
+
+# else, run loadgen
+locust --host="http://${FRONTEND_ADDR}" --headless -u "${USERS:-10}" 2>&1

locustfile.py

+#!/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
+from locust import HttpUser, TaskSet, between
+
+products = [
+    '0PUK6V6EV0',
+    '1YMWWN1N4O',
+    '2ZYFJ3GM2N',
+    '66VCHSJNUP',
+    '6E92ZMYYFZ',
+    '9SIQT8TOJO',
+    'L9ECAV7KIM',
+    'LS4PSXUNUM',
+    'OLJCESPC7Z']
+
+def index(l):
+    l.client.get("/")
+
+def setCurrency(l):
+    currencies = ['EUR', 'USD', 'JPY', 'CAD']
+    l.client.post("/setCurrency",
+        {'currency_code': random.choice(currencies)})
+
+def browseProduct(l):
+    l.client.get("/product/" + random.choice(products))
+
+def viewCart(l):
+    l.client.get("/cart")
+
+def addToCart(l):
+    product = random.choice(products)
+    l.client.get("/product/" + product)
+    l.client.post("/cart", {
+        'product_id': product,
+        'quantity': random.choice([1,2,3,4,5,10])})
+
+def checkout(l):
+    addToCart(l)
+    l.client.post("/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',
+    })
+
+class UserBehavior(TaskSet):
+
+    def on_start(self):
+        index(self)
+
+    tasks = {index: 1,
+        setCurrency: 2,
+        browseProduct: 10,
+        addToCart: 2,
+        viewCart: 3,
+        checkout: 1}
+
+class WebsiteUser(HttpUser):
+    tasks = [UserBehavior]
+    wait_time = between(1, 10)

requirements.in

+locust==1.0.2

requirements.txt

+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --output-file=requirements.txt requirements.in
+#
+certifi==2018.11.29       # via geventhttpclient, requests
+chardet==3.0.4            # via requests
+click==7.0                # via flask
+configargparse==1.2.3     # via locust
+flask-basicauth==0.2.0    # via locust
+flask==1.1.2              # via flask-basicauth, locust
+gevent==20.5.2            # via geventhttpclient, locust
+geventhttpclient==1.4.2   # via locust
+greenlet==0.4.15          # via gevent
+idna==2.8                 # via requests
+itsdangerous==1.1.0       # via flask
+jinja2==2.11.2            # via flask
+locust==1.0.2             # via -r requirements.in
+markupsafe==1.1.0         # via jinja2
+msgpack==1.0.0            # via locust
+psutil==5.7.0             # via locust
+pyzmq==17.0.0             # via locust
+requests==2.21.0          # via locust
+six==1.12.0               # via geventhttpclient
+urllib3==1.24.2           # via requests
+werkzeug==1.0.1           # via flask
+zope.event==4.4           # via gevent
+zope.interface==5.1.0     # via gevent
+
+# The following packages are considered to be unsafe in a requirements file:
+# setuptools