New directory for OpenTelemetry QuickStart (GoogleCloudPlatform#4016)

* creating new directory for opentelemetry version of quickstart

* slight modification to README

* updating requirements.txt

* Making modifications suggested by Shawn

* adding Shawn suggested documentation changes

* making suggested edits

* making more suggested changes to README.md

* adding production PyPi librarires

* fixing undefined issues

* fixing test issues and simplyfying example

* fixing mismatched region tag issue

* reworking service for GKE

* linting and adding more descriptive README.md

* fixing test issues

* linting

* adding suggested changes by Shawn

* linting and adding Shawn suggested changes

Co-authored-by: Leah E. Cole <[email protected]>

Author: aravinsiva

trace/cloud-trace-demo-app-opentelemetry/README.md

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+# cloud-trace-demo-app-opentelemetry
+
+Open this demo app in [Google Cloud Shell](https://cloud.google.com/shell/docs/). This includes necessary tools.
+
+
+[![Open Cloud Trace Demo APP in Cloud Shell](http://gstatic.com/cloudssh/images/open-btn.svg)](https://console.cloud.google.com/cloudshell/open?cloudshell_git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=trace/cloud-trace-demo-app/README.md&cloudshell_tutorial=trace/cloud-trace-demo-app/README.md)
+
+#### Demo Requirements
+If you are using Cloud Shell, skip to the next section.
+
+1. Install gcloud <https://cloud.google.com/sdk/install>
+2. Install kubectl <https://kubernetes.io/docs/tasks/tools/install-kubectl/>
+3. Install docker <https://docs.docker.com/install/>
+
+    
+#### Create a GKE cluster
+
+4. Enable Google Cloud and set up region and zone.
+
+    `gcloud init`
+5. Enable the GKE API & billing:
+
+    `gcloud services enable container.googleapis.com`
+6. Create a GKE cluster named "cloud-trace-demo", replacing `your-gcp-zone`  below
+with the 
+[GCP Zone](https://cloud.google.com/compute/docs/regions-zones) closest in proximity to you:
+
+     ```
+     gcloud container clusters create cloud-trace-demo\`
+     --num-nodes 1 \
+     --enable-basic-auth \
+     --issue-client-certificate \
+     --zone your-gcp-zone
+     ```
+7. Verify that you have access to the cluster:
+    
+    `kubectl get nodes`
+
+#### Deploy The Cloud Trace Demo App
+
+8. Build and tag the docker image for demo app:
+
+    `docker build -t gcr.io/${PROJECT_ID}/cloud-trace-demo:v1 .`
+9. Deploy resource to the cluster:
+
+    `kubectl apply -f deployment.yaml`
+10. Track the status of the deployment:
+
+    `kubectl get deployments`
+    
+    Deployment is complete when all of the available deployments are ready. 
+11. Run the following command to see the pods the deployment created:
+    
+    `kubectl get pods`  
+
+#### Deploy The Cloud Trace Demo Service
+
+12. Create the cloud trace demo service:
+    
+    `kubectl apply -f service.yaml`
+13. Get the services IP address by running the following command:
+    
+    `kubectl get services`
+14. Send a curl request to the EXTERNAL_IP, replacing `EXTERNAL_IP` with the external IP address found
+in step 13:
+    
+    `curl EXTERNAL_IP`
+15. Visit [Trace List](https://console.cloud.google.com/traces/list) to check traces generated.
+    Click on any trace in the graph to see the Waterfall View.
+    
+    ![Screenshot](example-trace.png)
+16. Clean up GKE cluster/pods/services:
+
+    `gcloud container clusters delete cloud-trace-demo`

trace/cloud-trace-demo-app-opentelemetry/app/Dockerfile

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+# Use the official lightweight Python image.
+# https://hub.docker.com/_/python
+FROM python:3.7-slim
+
+# Copy local code to the container image.
+ENV APP_HOME /app
+WORKDIR $APP_HOME
+COPY . ./
+COPY requirements.txt /app/
+RUN pip install Flask gunicorn
+RUN pip install -r requirements.txt
+
+CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 app:app

trace/cloud-trace-demo-app-opentelemetry/app/app.py

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+# 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
+#
+#     https://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.
+"""
+A sample app demonstrating CloudTraceSpanExporter
+"""
+import random
+import time
+
+# [START trace_demo_imports]
+import flask
+
+from opentelemetry import trace
+from opentelemetry.exporter.cloud_trace import CloudTraceSpanExporter
+from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.sdk.trace.export import SimpleExportSpanProcessor
+
+# [END trace_demo_imports]
+
+app = flask.Flask(__name__)
+
+
+def configure_exporter(exporter):
+    trace.set_tracer_provider(TracerProvider())
+
+    trace.get_tracer_provider().add_span_processor(SimpleExportSpanProcessor(exporter))
+
+
+tracer = trace.get_tracer(__name__)
+
+
+@app.route("/")
+def template_test():
+    # Sleep for a random time to imitate a random processing time
+    time.sleep(random.uniform(0, 0.5))
+
+    with tracer.start_as_current_span("span1"):
+        with tracer.start_as_current_span("span2"):
+            with tracer.start_as_current_span("span3"):
+                print("Hello world from Cloud Trace Exporter!")
+
+    return "Hello World"
+
+
+if __name__ == "__main__":
+    app.run(debug=True, host="0.0.0.0", port=8080)
+    configure_exporter(CloudTraceSpanExporter())

trace/cloud-trace-demo-app-opentelemetry/app/app_test.py

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+# 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
+#
+#     https://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.
+"""
+A sample app demonstrating Stackdriver Trace
+"""
+import mock
+
+import app
+
+
+def test_traces():
+    exporter = mock.Mock()
+    app.configure_exporter(exporter)
+    client = app.app.test_client()
+    resp = client.get("/")
+    assert resp.status_code == 200

trace/cloud-trace-demo-app-opentelemetry/app/deployment.yaml

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+# This file configures the hello-world app which serves public web traffic.
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: cloud-trace-demo
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: trace-demo
+  template:
+    metadata:
+      labels:
+        app: trace-demo
+    spec:
+      containers:
+      - name: trace-demo-app
+        # Replace $GCLOUD_PROJECT with your project ID
+        image: gcr.io/$GCLOUD_PROJECT/cloud-trace-demo:latest
+        # This app listens on port 8080 for web traffic by default.
+        ports:
+        - containerPort: 8080
+        env:
+          - name: PORT
+            value: "8080"

trace/cloud-trace-demo-app-opentelemetry/app/requirements-test.txt

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+pytest==5.3.2
+mock==3.0.5

trace/cloud-trace-demo-app-opentelemetry/app/requirements.txt

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+Flask==1.1.2
+opentelemetry-api==0.9b0
+opentelemetry-auto-instrumentation==0.8b0
+opentelemetry-exporter-cloud-trace==0.9b0
+opentelemetry-ext-flask==0.8b0
+opentelemetry-ext-grpc==0.9b0
+opentelemetry-ext-jaeger==0.8b0
+opentelemetry-ext-requests==0.8b0
+opentelemetry-ext-wsgi==0.8b0
+opentelemetry-sdk==0.9b0
+grpcio==1.29.0
+httpretty==1.0.2
+google-cloud-monitoring==1.0.0
+google-cloud-trace==0.23.0
+

trace/cloud-trace-demo-app-opentelemetry/app/service.yaml

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+# The hello service provides a load-balancing proxy over the hello-app
+# pods. By specifying the type as a 'LoadBalancer', Kubernetes Engine will
+# create an external HTTP load balancer.
+apiVersion: v1
+kind: Service
+metadata:
+  name: trace-demo
+spec:
+  type: LoadBalancer
+  selector:
+    app: trace-demo
+  ports:
+  - port: 80
+    targetPort: 8080

trace/cloud-trace-demo-app-opentelemetry/example-trace.png

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+#!/bin/bash
+################## Set up service a ###########################
+
+echo "Creating service a"
+kubectl apply -f app/demo-service-a.yaml
+
+################## Set up service b ###########################
+echo "Fetching the external IP of service a"
+endpoint=""
+for run in {1..20}
+do
+  echo "Attempt #${run} to fetch the external IP of service a..."
+  sleep 5
+  endpoint=`kubectl get svc cloud-trace-demo-a -ojsonpath='{.status.loadBalancer.ingress[0].ip}'`
+  if [[ "$endpoint" != "" ]]; then
+    break
+  fi
+done
+
+if [[ "$endpoint" == "" ]]; then
+  echo "Unable to get external IP for service cloud-trace-demo-a"
+  exit 1
+fi
+
+echo "Passing external IP for the first service ${endpoint} to the second service template"
+sed "s/{{ endpoint }}/${endpoint}/g" app/demo-service-b.yaml.template > app/demo-service-b.yaml
+kubectl apply -f app/demo-service-b.yaml
+rm app/demo-service-b.yaml
+
+################## Set up service c ###########################
+echo "Fetching the external IP of service b"
+endpoint=""
+for run in {1..20}
+do
+  echo "Attempt #${run} to fetch the external IP of service b..."
+  sleep 5
+  endpoint=`kubectl get svc cloud-trace-demo-b -ojsonpath='{.status.loadBalancer.ingress[0].ip}'`
+  if [[ "$endpoint" != "" ]]; then
+    break
+  fi
+done
+
+if [[ "$endpoint" == "" ]]; then
+  echo "Unable to get external IP for service cloud-trace-demo-a"
+  exit 1
+fi
+
+echo "Passing external IP for the service b ${endpoint} to the service c"
+sed "s/{{ endpoint }}/${endpoint}/g" app/demo-service-c.yaml.template > app/demo-service-c.yaml
+kubectl apply -f app/demo-service-c.yaml
+rm app/demo-service-c.yaml
+
+echo "Successfully deployed all services"