Add code sample for Google Cloud Memorystore. (GoogleCloudPlatform#614)

* Add code sample for Google Cloud Memorystore.

* addressing review comments
adding links

memorystore/redis/README.md

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+# Getting started with Googe Cloud Memorystore
+Simple HTTP server example to demonstrate connecting to [Google Cloud Memorystore](https://cloud.google.com/memorystore/docs/redis).
+This sample uses the [node_redis client](https://github.com/NodeRedis/node_redis).
+
+## Running on GCE
+
+Follow the instructions in [this guide](https://cloud.google.com/memorystore/docs/redis/connect-redis-instance-gce) to deploy the sample application on a GCE VM.
+
+## Running on GKE
+
+Follow the instructions in [this guide](https://cloud.google.com/memorystore/docs/redis/connect-redis-instance-gke) to deploy the sample application on GKE.
+
+## Running on Google App Engine Flex
+
+Follow the instructions in [this guide](https://cloud.google.com/memorystore/docs/redis/connect-redis-instance-flex) to deploy the sample application on GAE Flex.

memorystore/redis/app.yaml

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+# Copyright 2018 Google, Inc.
+# 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.
+# [START memorystore_app_yaml]
+runtime: nodejs
+env: flex
+
+# update with Redis instance details
+env_variables:
+  REDISHOST: '127.0.0.1'
+  REDISPORT: '6379'
+
+# update with Redis instance network name
+network:
+  name: default
+# [END memorystore_app_yaml]

memorystore/redis/gce_deployment/deploy.sh

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+#!/bin/bash
+
+# Copyright 2018 Google Inc.
+#
+# 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.
+# [START memorystore_deploy_sh]
+if [ -z "$REDISHOST" ]; then
+  echo "Must set \$REDISHOST. For example: REDISHOST=127.0.0.1"
+  exit 1
+fi
+
+if [ -z "$REDISPORT" ]; then
+  echo "Must set \$REDISPORT. For example: REDISPORT=6379"
+  exit 1
+fi
+
+if [ -z "$GCS_APP_LOCATION" ]; then
+  echo "Must set \$GCS_APP_LOCATION. For example: GCS_APP_LOCATION=gs://my-bucket/app"
+  exit 1
+fi
+
+if [ -z "$ZONE" ]; then
+  ZONE=$(gcloud config get-value compute/zone -q)
+  echo $ZONE
+fi
+
+#Upload the tar to GCS
+tar -cvf app.tar -C .. package.json server.js
+# Copy to GCS bucket
+gsutil cp app.tar $GCS_APP_LOCATION
+
+# Create an instance
+gcloud compute instances create my-instance \
+    --image-family=debian-8 \
+    --image-project=debian-cloud \
+    --machine-type=g1-small \
+    --scopes cloud-platform \
+    --metadata-from-file startup-script=startup-script.sh \
+    --metadata app-location=$GCS_APP_LOCATION,redis-host=$REDISHOST,redis-port=$REDISPORT \
+    --zone $ZONE \
+    --tags http-server
+
+gcloud compute firewall-rules create allow-http-server-8080 \
+    --allow tcp:8080 \
+    --source-ranges 0.0.0.0/0 \
+    --target-tags http-server \
+    --description "Allow port 8080 access to http-server"
+# [END memorystore_deploy_sh]

memorystore/redis/gce_deployment/startup-script.sh

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+#! /bin/bash
+
+# Copyright 2018 Google Inc.
+#
+# 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.
+# [START memorystore_startup_script_sh]
+set -ex
+
+# Talk to the metadata server to get the project id and location of application binary.
+PROJECTID=$(curl -s "http://metadata.google.internal/computeMetadata/v1/project/project-id" -H "Metadata-Flavor: Google")
+GCS_APP_LOCATION=$(curl -s "http://metadata.google.internal/computeMetadata/v1/instance/attributes/app-location" -H "Metadata-Flavor: Google")
+REDISHOST=$(curl -s "http://metadata.google.internal/computeMetadata/v1/instance/attributes/redis-host" -H "Metadata-Flavor: Google")
+REDISPORT=$(curl -s "http://metadata.google.internal/computeMetadata/v1/instance/attributes/redis-port" -H "Metadata-Flavor: Google")
+
+# Install dependencies from apt
+apt-get update
+# Install Node.js 9
+curl -sL https://deb.nodesource.com/setup_9.x | sudo -E bash -
+apt-get install -yq ca-certificates supervisor nodejs build-essential
+
+
+# Install logging monitor. The monitor will automatically pickup logs send to
+# syslog.
+curl -s "https://storage.googleapis.com/signals-agents/logging/google-fluentd-install.sh" | bash
+service google-fluentd restart &
+
+gsutil cp $GCS_APP_LOCATION /app.tar
+mkdir -p /app
+tar -x -f /app.tar -C /app
+cd /app
+# Install the app dependencies
+npm install
+
+# Create a nodeapp user. The application will run as this user.
+getent passwd nodeapp || useradd -m -d /home/nodeapp nodeapp
+chown -R nodeapp:nodeapp /app
+
+# Configure supervisor to run the Go app.
+cat >/etc/supervisor/conf.d/nodeapp.conf << EOF
+[program:nodeapp]
+directory=/app
+environment=HOME="/home/nodeapp",USER="nodeapp",REDISHOST=$REDISHOST,REDISPORT=$REDISPORT
+command=node server.js
+autostart=true
+autorestart=true
+user=nodeapp
+stdout_logfile=syslog
+stderr_logfile=syslog
+EOF
+
+supervisorctl reread
+supervisorctl update
+# [END memorystore_startup_script_sh]

memorystore/redis/gce_deployment/teardown.sh

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+#!/bin/bash
+
+# Copyright 2018 Google Inc.
+#
+# 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.
+# [START memorystore_teardown_sh]
+gcloud compute instances delete my-instance
+
+gcloud compute firewall-rules delete allow-http-server-8080
+# [END memorystore_teardown_sh]

memorystore/redis/gke_deployment/Dockerfile

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+# Copyright 2018, Google, Inc.
+# 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 node:6-alpine
+
+ENV REDISHOST redis
+ENV REDISPORT 6379
+
+COPY package.json .
+RUN npm install
+
+COPY server.js .
+CMD node server.js
+
+EXPOSE 8080
+

memorystore/redis/gke_deployment/visit-counter.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: visit-counter
+  labels:
+    app: visit-counter
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: visit-counter
+    spec:
+      containers:
+      - name: visit-counter
+        image: "gcr.io/<PROJECT_ID>/visit-counter:v1"
+        env:
+        - name: REDISHOST
+          valueFrom:
+            configMapKeyRef:
+              name: redishost
+              key: REDISHOST
+        ports:
+        - name: http
+          containerPort: 8080
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: visit-counter
+spec:
+  type: LoadBalancer
+  selector:
+    app: visit-counter
+  ports:
+  - port: 80
+    targetPort: 8080
+    protocol: TCP
+

memorystore/redis/package.json

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+{
+  "name": "memorystore-redis",
+  "description": "An example of using Memorystore(Redis) with Node.js",
+  "version": "0.0.1",
+  "private": true,
+  "license": "Apache Version 2.0",
+  "author": "Google Inc.",
+  "engines": {
+    "node": ">=6"
+  },
+  "devDependencies": {
+    "lint": "^1.1.2"
+  },
+  "dependencies": {
+    "redis": "2.6.5"
+  }
+}
+

memorystore/redis/server.js

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+/**
+ * Copyright 2018 Google, Inc.
+ * 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.
+ */
+// [START memorystore_server_js]
+'use strict';
+const http = require('http');
+const redis = require('redis');
+
+const REDISHOST = process.env.REDISHOST || 'localhost';
+const REDISPORT = process.env.REDISPORT || 6379;
+
+const client = redis.createClient(REDISPORT, REDISHOST);
+client.on('error', (err) => console.error('ERR:REDIS:', err));
+
+// create a server
+http.createServer((req, res) => {
+// increment the visit counter
+  client.incr('visits', (err, reply) => {
+    if (err) {
+      console.log(err);
+      res.status(500).send(err.message);
+      return;
+    }
+    res.writeHead(200, { 'Content-Type': 'text/plain' });
+    res.end(`Visitor number: ${reply}\n`);
+  });
+}).listen(8080);
+// [END memorystore_server_js]