emailservice: Reduced Docker image size to ~240 MB. Used multi stage builds and alpine image

src/emailservice/Dockerfile

@@ -1,27 +1,52 @@
+FROM python:2.7-alpine3.8 as base
+
+FROM base as builder
+
+# gRPC deps
+RUN apk add --update --no-cache \
+    gcc \
+    linux-headers \
+    make \
+    musl-dev \
+    python-dev \
+    g++ \
+    cairo-dev \
+    cairo \
+    openssl-dev \ 
+    gobject-introspection-dev
+
+ENV GRPC_PYTHON_VERSION 1.15.0
+
+# Install grpcio
+RUN python -m pip install --upgrade pip
+RUN pip install grpcio==${GRPC_PYTHON_VERSION} grpcio-tools==${GRPC_PYTHON_VERSION}
+
+# get packages
+COPY requirements.txt .
+
+RUN pip install -r requirements.txt
 
 
-# Use the grpc.io provided Python image as the base image
-FROM grpc/python:1.0
+FROM base as final
 
-# download the grpc health probe
+# Download the grpc health probe
 RUN GRPC_HEALTH_PROBE_VERSION=v0.1.0-alpha.1 && \
     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
 
-# show python logs as they occur
+# Show python logs as they occur
 ENV PYTHONUNBUFFERED=0
 
-# install pip for python3
-RUN apt-get -qqy update && \
-        apt-get -qqy install python3-pip
-
-# get packages
 WORKDIR /email_server
-COPY requirements.txt .
-RUN pip3 install -r requirements.txt
+
+# Grab packages from builder
+COPY --from=builder /usr/local/lib/python2.7/ /usr/local/lib/python2.7/
+
+# Need libstdc++ for grpc
+RUN apk add --no-cache libstdc++
 
 # Add the application
 COPY . .
 
 EXPOSE 8080
-ENTRYPOINT [ "python3", "email_server.py" ]
+ENTRYPOINT [ "python", "email_server.py" ]

src/emailservice/requirements.txt

@@ -1,31 +1,41 @@
+drive.web-frontend_20180920.00_p1
+asn1crypto==0.24.0
 cachetools==2.1.0
-certifi==2018.4.16
+certifi==2018.8.24
+cffi==1.11.5
 chardet==3.0.4
-cryptography==1.7.1
-google-api-core==1.2.1
-google-auth==1.5.0
+configparser==3.5.0
+cryptography==2.3.1
+entrypoints==0.2.3
+enum34==1.1.6
+futures==3.2.0
+google-api-core==1.4.0
+google-auth==1.5.1
 google-cloud-core==0.28.1
 google-cloud-trace==0.19.0
 googleapis-common-protos==1.5.3
 grpc-google-iam-v1==0.11.4
-grpcio==1.12.1
-grpcio-health-checking==1.14.1
-grpcio-tools==1.12.1
+grpcio==1.15.0
+grpcio-health-checking==1.15.0
+grpcio-tools==1.15.0
 idna==2.7
+ipaddress==1.0.22
 Jinja2==2.10
-keyring==10.1
-keyrings.alt==1.3
+keyring==15.1.0
+keyrings.alt==3.1
 MarkupSafe==1.0
-opencensus==0.1.5
-protobuf==3.6.0
-pyasn1==0.4.3
+opencensus==0.1.7
+protobuf==3.6.1
+pyasn1==0.4.4
 pyasn1-modules==0.2.2
+pycairo==1.17.1
+pycparser==2.19
 pycrypto==2.6.1
-pygobject==3.22.0
+PyGObject==3.30.1
 pytz==2018.5
-pyxdg==0.25
+pyxdg==0.26
 requests==2.19.1
-rsa==3.4.2
+rsa==4.0
 SecretStorage==2.3.1
 six==1.11.0
-urllib3==1.23
+urllib3==1.23