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Backend part of the source code of the post Fullstack Kafka

You can read Fullstack Kafka as a documentation for this repository, particulary the section Building the Microservices.

You can see a video of the example application in action.

demo video

Deployment guide

Prerequisites

You need to install Kafka Streaming Platform and Cassandra before starting this guide. Please read the section Setting the infrastructrue of the Fullstack Kafka post to setup Kafka topics, Cassandra tables and materialized views, and Datastax Sink Connector.

Deployment

We recommend using Docker for deployment.

In this guide, we will put everything in one container. It is not recommended for production.

1 - clone the backend and frontend repositories

git clone git://github.com/acmoune/product-reviewer.git product-reviewer
git clone git://github.com/acmoune/product-reviewer-client.git product-reviewer-client

2 - Create the root folder for your docker image, and add a src folder inside.

mkdir /path/to/docker-image
mkdir /path/to/docker-image/src

3 - Copy the client to the docker-image's src folder

cp -r product-reviewer-client /path/to/docker-image/src/

4 - Build each Microservice and copy it to the docker-image's src folder

cd product-reviewer
sbt
sbt:product-reviewer> security/stage
sbt:product-reviewer> reviews/stage
sbt:product-reviewer> statistics/stage
sbt:product-reviewer> webserver/universal:packageZipTarball
sbt:product-reviewer> exit

cp -r security/target/univrsal /path/to/docker-image/src/security
cp -r reviews/target/univrsal /path/to/docker-image/src/reviews
cp -r statistics/target/univrsal /path/to/docker-image/src/statistics
cp webserver/target/universal/webserver-1.0.0.tgz /path/to/docker-image/src/

Then, from the /path/to/docker-image/src/ folder, extract the folder from the archive webserver-1.0.0.tgz and rename it to webserver, then delete the file webserver-1.0.0.tgz.

By the end of this step, the /path/to/docker-image/src/ folder most contain five directories: product-reviewer-client, security, reviews, statistics, and webserver.

5 - Create a Dockerfile in the /path/to/docker-image/ folder and put this content inside:

FROM ubuntu:bionic
LABEL maintainer="[email protected]"

# Init
# Use bash as replacement for sh
RUN rm /bin/sh && ln -s /bin/bash /bin/sh
RUN apt-get update && \
    apt-get install -y apt-utils curl software-properties-common build-essential

# Install nodejs and npm
RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
    apt-get install -y nodejs && \
    echo NodeJS version && node -v && \
    echo Npm version && npm -v
    
# Install Java
RUN mkdir -p /var/cache/oracle-jdk11-installer-local/
COPY java/jdk-11.0.7_linux-x64_bin.tar.gz /var/cache/oracle-jdk11-installer-local/
RUN add-apt-repository -y ppa:linuxuprising/java && \
    apt-get update && \
    echo oracle-java11-installer shared/accepted-oracle-license-v1-2 select true | /usr/bin/debconf-set-selections && \
    apt-get install -y oracle-java11-installer-local && \
    apt-get install -y oracle-java11-set-default-local && java -version

RUN source /etc/profile
COPY src /src/
WORKDIR /src/product-reviewer-client
RUN npm install
RUN npm build
EXPOSE 9000 3000
WORKDIR /

# Kafka
ENV KAFKA_BOOTSTRAP_SERVERS 172.17.0.1:9092
ENV SCHEMA_REGISTRY_URL http://172.17.0.1:8081

# Topics
# ENV SECURITY_EVENTSOURCE_TOPIC_NAME security-eventsource
# ENV REVIEWS_EVENTSOURCE_TOPIC_NAME reviews-eventsource
# ENV REVIEWS_CHANGELOG_TOPIC_NAME reviews-changelog
# ENV TASKS_CHANGELOG_TOPIC_NAME tasks-changelog
# ENV STATS_CHANGELOG_TOPIC_NAME tasks-changelog

# Cassandra
ENV CONTACT_POINTS 172.17.0.1:9042
# ENV LOAD_BALANCING_LOCAL_DATACENTER datacenter1
# ENV SESSION_KEYSPACE proreviewer

ENTRYPOINT /src/security/stage/bin/security& /src/reviews/stage/bin/reviews& /src/statistics/stage/bin/statistics& /src/webserver/bin/webserver -Dhttp.port=9000& cd /src/product-reviewer-client && npm start& wait

You can adjust the Env variables to match your environment. You can see the default values on those commented.

6 - As you can see from the Dockerfile, you must create a java folder in /path/to/docker-image/ and put JDK inside. Make sur you download the exact same version.

/path/to/docker-image/java/jdk-11.0.7_linux-x64_bin.tar.gz

By the end of this step, your docker-image folder most contain two directories: java and src, and the Dockerfile.

7 - Build the docker image

cd /path/to/docker-image/
docker image build -t proreviewer:beta .

8 - Run the application

Again, make sure you went throug the section Setting the infrastructrue of the Fullstack Kafka post to setup Kafka topics, Cassandra tables and materialized views, and Datastax Sink Connector before running your container.

docker container run -d --name proreviewer -p 3000:3000 -p 9000:9000 proreviewer:beta

That is it! If everything went well and all the configurations are corrects, you should access the application on http://localhost:3000

Do not hesitate to open an issue if needed.

Good luck!