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sunbird-dial-service

Micro-service for DIAL code management

DIAL-Service local setup

This readme file contains the instruction to set up and run the DIAL-service in local machine.

Prerequisites:

  • Elasticsearch
  • Redis
  • Cassandra

Prepare folders for database data and logs

mkdir -p ~/sunbird-dbs/neo4j ~/sunbird-dbs/cassandra ~/sunbird-dbs/redis ~/sunbird-dbs/es ~/sunbird-dbs/kafka
export sunbird_dbs_path=~/sunbird-dbs

Elasticsearch database setup in docker:

docker run --name sunbird_es -d -p 9200:9200 -p 9300:9300 \
-v $sunbird_dbs_path/es/data:/usr/share/elasticsearch/data \
-v $sunbird_dbs_path/es/logs://usr/share/elasticsearch/logs \
-v $sunbird_dbs_path/es/backups:/opt/elasticsearch/backup \
 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:6.8.22

--name - Name your container (avoids generic id)

-p - Specify container ports to expose

Using the -p option with ports 7474 and 7687 allows us to expose and listen for traffic on both the HTTP and Bolt ports. Having the HTTP port means we can connect to our database with Neo4j Browser, and the Bolt port means efficient and type-safe communication requests between other layers and the database.

-d - This detaches the container to run in the background, meaning we can access the container separately and see into all of its processes.

-v - The next several lines start with the -v option. These lines define volumes we want to bind in our local directory structure so we can access certain files locally.

--env - Set config as environment variables for Neo4j database

Redis database setup in docker:

  1. we need to get the redis image from docker hub using the below command.
docker pull redis:6.0.8
  1. We need to create the redis instance, By using the below command we can create the same and run in a container.
docker run --name sunbird_redis -d -p 6379:6379 redis:6.0.8
  1. To SSH to redis docker container, run the below command
docker exec -it sunbird_redis bash

cassandra database setup in docker:

  1. we need to get the cassandra image and can be done using the below command.
docker pull cassandra:3.11.8
  1. We need to create the cassandra instance, By using the below command we can create the same and run in a container.
docker run --name sunbird_cassandra -d -p 9042:9042 \
-v $sunbird_dbs_path/cassandra/data:/var/lib/cassandra \
-v $sunbird_dbs_path/cassandra/logs:/opt/cassandra/logs \
-v $sunbird_dbs_path/cassandra/backups:/mnt/backups \
--network bridge cassandra:3.11.8

For network, we can use the existing network or create a new network using the following command and use it.

docker network create sunbird_db_network
  1. To start cassandra cypher shell run the below command.
docker exec -it sunbird_cassandra cqlsh
  1. To ssh to cassandra docker container, run the below command.
docker exec -it sunbird_cassandra /bin/bash
  1. Load seed data to cassandra using the instructions provided in the link

Running kafka using docker:

  1. Kafka stores information about the cluster and consumers into Zookeeper. ZooKeeper acts as a coordinator between them. we need to run two services(zookeeper & kafka), Prepare your docker-compose.yml file using the following reference.
version: '3'

services:
  zookeeper:
    image: 'wurstmeister/zookeeper:latest'
    container_name: zookeeper
    ports:
      - "2181:2181"    
    environment:
      - KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://127.0.0.1:2181     
    
  kafka:
    image: 'wurstmeister/kafka:2.11-1.0.1'
    container_name: kafka
    ports:
      - "9092:9092"
    environment:
      - KAFKA_BROKER_ID=1
      - KAFKA_LISTENERS=PLAINTEXT://:9092
      - KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://127.0.0.1:9092
      - KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181      
      - ALLOW_PLAINTEXT_LISTENER=yes
    depends_on:
      - zookeeper
  1. Go to the path where docker-compose.yml placed and run the below command to create and run the containers (zookeeper & kafka).
docker-compose -f docker-compose.yml up -d
  1. To start kafka docker container shell, run the below command.
docker exec -it kafka sh

Go to path /opt/kafka/bin, where we will have executable files to perform operations(creating topics, running producers and consumers, etc). Example:

kafka-topics.sh --create --zookeeper zookeeper:2181 --replication-factor 1 --partitions 1 --topic test_topic

Running DIAL-service:

  1. Go to the path: /sunbird-dial-service and run the below maven command to build the application.
mvn clean install -DskipTests
  1. Go to the path: /sunbird-dial-service and run the below maven command to run the netty server.
mvn play2:run
  1. Using the below command we can verify whether the databases(neoj,redis & cassandra) connection is established or not. If all connections are good, health is shown as 'true' otherwise it will be 'false'.
curl http://localhost:9000/health

DIAL code Custom Context Setup

  1. 'jsonld-schema' folder is used to save context and json-ld files.
  2. For implementing custom context, you can create a folder under 'jsonld-schema'. Folder should contain 'context.json' file. Specify the folder name in 'jsonld.type' attribute in 'application.conf' file for application to refer to new context.
  3. 'contextValidation.json' file is optional. If available, context data input validation will happen when dial code update v2 API call is made with 'contextInfo'.
  4. Reference of 'sb' vocabulary (schema.jsonld) in the custom 'context.json' is a must.