Updated WebUI Dockerfile

src/webui/Dockerfile

@@ -12,14 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM python:3-slim
+FROM python:3.9-slim
 
 # Ref: https://pythonspeed.com/articles/activate-virtualenv-dockerfile/
 
 # Install dependencies
-RUN apt-get --yes --quiet --quiet update && \
-    apt-get --yes --quiet --quiet install wget g++ && \
-    rm -rf /var/lib/apt/lists/*
+# RUN apt-get --yes --quiet --quiet update && \
+#     apt-get --yes --quiet --quiet install wget g++ && \
+#     rm -rf /var/lib/apt/lists/*
 
 # Set Python to show logs as they occur
 ENV PYTHONUNBUFFERED=0
@@ -30,7 +30,7 @@ ENV PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION='python'
 #     wget -qO/bin/grpc_health_probe https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/${GRPC_HEALTH_PROBE_VERSION}/grpc_health_probe-linux-amd64 && \
 #     chmod +x /bin/grpc_health_probe
 
-# creating a user for security reasons
+# Creating a user for security reasons
 RUN groupadd -r webui && useradd --no-log-init -r -m -g webui webui
 USER webui
 
@@ -42,9 +42,21 @@ WORKDIR /home/webui/teraflow
 ENV VIRTUAL_ENV=/home/webui/venv
 RUN python3 -m venv ${VIRTUAL_ENV}
 ENV PATH="${VIRTUAL_ENV}/bin:${PATH}"
-COPY --chown=webui:webui webui/requirements.in /home/webui/teraflow/webui/requirements.in
-RUN pip install --upgrade pip setuptools wheel pip-tools && pip-compile --output-file=webui/requirements.txt webui/requirements.in
-RUN pip install -r webui/requirements.txt
+
+# Get generic Python packages
+RUN python3 -m pip install --upgrade pip
+RUN python3 -m pip install --upgrade setuptools wheel
+RUN python3 -m pip install --upgrade pip-tools
+
+# Get common Python packages
+# Note: this step enables sharing the previous Docker build steps among all the Python components
+COPY --chown=webui:webui common_requirements.in common_requirements.in
+RUN pip-compile --quiet --output-file=common_requirements.txt common_requirements.in
+RUN python3 -m pip install -r common_requirements.txt
+
+COPY --chown=webui:webui src/webui/requirements.in requirements.in
+RUN pip-compile --output-file=requirements.txt requirements.in
+RUN pip install -r requirements.txt
 
 # Add files into working directory
 COPY --chown=webui:webui common/. common
@@ -59,5 +71,5 @@ COPY --chown=webui:webui service/proto/. service/proto
 COPY --chown=webui:webui service/client/. service/client
 COPY --chown=webui:webui webui/. webui
 
-# Start webui service
+# Start the service
 ENTRYPOINT ["python", "-m", "webui.service"]