move movies.py to /src + add volume to hot reload

docker-compose.yaml

@@ -8,7 +8,15 @@ services:
             - "5001:5001"
         networks:
             - microservices-net #allows communication to all services on this network, ie, to stservice
-
+#next let us make it such that we can edit the movie service and change it on the fly
+        environment:
+            FLASK_ENV: development #set flask env so that it reloads when source code changes
+        volumes:
+            - .:/src
+        # The above mapping should correspond to where py files are copied over in movieservice/Dockerfile
+        # Now, when the source code changes in host, it is reflected in the "/" working dir of the container
+        # This change is detected by Flask and reloads the movie service
+        # Note that this reloading does NOT happen for stservice below as it lacks this config!
     stservice:
         image: stservice-img
         build:

movies.py

@@ -26,7 +26,9 @@ def movie_info(movieid):
 
     result = movies[movieid]
     result["uri"] = "/movies/{}".format(movieid)
-
+    #show that this change is visible. Uncomment the below and see the title change
+    #Note that you dont have to restart the container or service. Flask in dev mode restarts itself!
+    #result["title"] = "hello world"
     return json.dumps(result)
 
 

movieservice/Dockerfile

@@ -2,7 +2,7 @@ FROM python:3.8-alpine
 WORKDIR /
 COPY movieservice/requirements.txt .
 RUN pip install -r requirements.txt
-COPY ./movies.py /
+COPY ./movies.py /src/
 COPY ./database /database
 EXPOSE 5001
-CMD python movies.py
+CMD python src/movies.py