Add waitress and resolve port conflict

Signed-off-by: eyuen <eyuen@redhat.com>

Author: elsony

app.py

@@ -1,11 +1,11 @@
 from flask import Flask
+from waitress import serve
 
 app = Flask(__name__)
 
-
 @app.route('/')
 def hello():
     return "Hello World!"
 
 if __name__ == '__main__':
-    app.run(port=8080,host='0.0.0.0')
+    serve(app, host='0.0.0.0', port=8080)

devfile.yaml

@@ -18,8 +18,8 @@ components:
       image: buildguidanceimage-placeholder
       memoryLimit: 1024Mi
       endpoints:
-        - name: http-8080
-          targetPort: 8080
+        - name: http-8081
+          targetPort: 8081
   - name: py-web
     container:
       image: quay.io/eclipse/che-python-3.7:nightly

docker/Dockerfile

@@ -7,17 +7,20 @@
 #
 # Then run the container using:
 #
-# docker run -i --rm -p 8080:8080 python/sample-basic
+# docker run -i --rm -p 8081:8081 python/sample-basic
 ####
 FROM python:slim
 
 WORKDIR /projects
-COPY . .
+
+COPY requirements.txt requirements.txt
 
 RUN python3 -m venv venv
 RUN . venv/bin/activate
 RUN pip install -r requirements.txt
 
-EXPOSE 8080
-CMD [ "python", "app.py"]
+COPY . .
+
+EXPOSE 8081
+CMD [ "waitress-serve", "--port=8081", "app:app"]
 

requirements.txt

@@ -1 +1,2 @@
 Flask==1.1.2
+waitress==2.0.0