fix docker issue

Author: wasin-waeosri

.dockerignore

@@ -1,4 +1,4 @@
-notebook
+notebook/
 .vscode
 mrn_python
 .gitignore

Dockerfile

@@ -1,16 +1,25 @@
-FROM python:3.7-alpine
+#Build stage, using slim based-image because alpine cannot use Pandas and Matplotlib
+FROM python:3.8.11-slim AS builder
 
 LABEL maintainer="Wasin Waeosri <wasin.waeosri@rifinitiv.com>"
-LABEL build_date="2021-05-18"
-# set working directory
-WORKDIR /app
 
-# Copy requirements.txt first 
+#Copy requirements.txt
 COPY requirements.txt .
-# instruction to be run during image build
-RUN pip install -r requirements.txt
 
-# then copy the application
+# install dependencies to the local user directory (eg. /root/.local)
+RUN pip install --user -r requirements.txt
+
+# Run stage, using slim based-image because alpine cannot use Pandas and Matplotlib
+FROM python:3.8.11-alpine
+WORKDIR /app
+
+# Update PATH environment variable + set Python buffer to make Docker print every message instantly.
+ENV PATH=/root/.local:$PATH \
+    PYTHONUNBUFFERED=1
+
+# copy only the dependencies installation from the 1st stage image
+COPY --from=builder /root/.local /root/.local
 COPY mrn_console_app.py .
 
+#Run Python
 ENTRYPOINT ["python", "./mrn_console_app.py"]

README.md

@@ -1,5 +1,5 @@
 # WebSocket API Machine Readable News Example with Python
-- Last update: May 2021
+- Last update: September 2021
 - Environment: Windows and Linux OS 
 - Compiler: Python
 - Prerequisite: Refinitiv Real-Time Advanced Data Hub and Refinitiv Real-Time Advanced Distribution servers version 3.2.1 and above, MRN service
@@ -59,7 +59,7 @@ This example requires the following dependencies software and libraries.
 6. [Docker Engine - Community Edition](https://docs.docker.com/install/) (for running a console example in Docker only)
 
 *Note:* 
-- The Python example has been qualified with Python versions 3.6.5 and Python 3.7.4 (Docker 19.03.1 - CentOS 7)
+- The Python example has been qualified with Python versions 3.6.5, Python 3.7.4 and Python 3.8.x (Docker 19.03.1 - CentOS 7)
 - Please refer to the [pip installation guide page](https://pip.pypa.io/en/stable/installing/) if your environment does not have the [pip tool](https://pypi.org/project/pip/) installed. 
 - If your environment already have a websocket-client library installed, you can use ```pip list``` command to verify a library version, then use ```pip install --upgrade websocket-client``` command to upgrade websocket-client library. 
 - It is not advisable to change the Refinitiv Real-Time Distribution System configuration if you are not familiar with the configuration procedures. Please consult your Market Data administrator for any questions regarding Refinitiv Real-Time Distribution System-MRN service configuration.
@@ -95,9 +95,10 @@ Optionally, the application subscribes ```MRN_STORY``` RIC code from Real-Time A
     ```
 3. Once the build is a success, you can create and run the container with the following command
     ```
-    $> docker run rtsdk_ws_mrn_python --hostname Real-Time Advanced Distribution Server IP Address/Hostname> --port <WebSocket Port> --ric <MRN RIC name>
+    $> docker run --name mrn_console -it rtsdk_ws_mrn_python --hostname Real-Time Advanced Distribution Server IP Address/Hostname> --port <WebSocket Port> --ric <MRN RIC name>
     ```
 4. If you want to connect the Docker container to a localhost, please use ```host.docker.internal``` as the Host name. 
+5. Press Ctrl+C buttons to stop the application
 
 ### Classic Jupyter Notebook example
 
@@ -106,7 +107,7 @@ Please be informed that  Python [Anaconda](https://www.anaconda.com/distribution
 1. Open Anaconda Prompt and go to the project's folder
 2. Run the following command in an Anaconda Prompt to create a Conda environment named *mrn_python_notebook* for the project.
   ```
-  (base) $>conda create --name mrn_python_notebook python=3.7
+  (base) $>conda create --name mrn_python_notebook python=3.8
   ```
 3. Once the environment is created, activate Conda environment named ```mrn_python_notebook``` with this command in Anaconda Prompt
   ```

requirements.txt

@@ -12,7 +12,7 @@ pylint==2.6.0
 requests==2.25.1
 six==1.12.0
 toml==0.10.1
-typed-ast==1.4.1
+typed-ast==1.4.3
 urllib3>=1.25.8
 websocket-client==0.56.0
 wrapt==1.12.1