Topcoder - Legacy Challenge Processor

Dependencies

• nodejs https://nodejs.org/en/ (v8)
• Kafka
• Informix
• Docker, Docker Compose

Configuration

Configuration for the legacy groups processor is at config/default.js. The following parameters can be set in config files or in env variables:

• LOG_LEVEL: the log level; default value: 'debug'
• KAFKA_URL: comma separated Kafka hosts; default value: 'localhost:9092'
• KAFKA_CLIENT_CERT: Kafka connection certificate, optional; default value is undefined; if not provided, then SSL connection is not used, direct insecure connection is used; if provided, it can be either path to certificate file or certificate content
• KAFKA_CLIENT_CERT_KEY: Kafka connection private key, optional; default value is undefined; if not provided, then SSL connection is not used, direct insecure connection is used; if provided, it can be either path to private key file or private key content
• KAFKA_GROUP_ID: the Kafka group id, default value is 'legacy-challenge-processor'
• CREATE_CHALLENGE_TOPIC: the create challenge Kafka message topic, default value is 'challenge.notification.create'
• UPDATE_CHALLENGE_TOPIC: the update challenge Kafka message topic, default value is 'challenge.notification.update'
• AUTH0_URL: Auth0 URL, used to get TC M2M token
• AUTH0_AUDIENCE: Auth0 audience, used to get TC M2M token
• TOKEN_CACHE_TIME: Auth0 token cache time, used to get TC M2M token
• AUTH0_CLIENT_ID: Auth0 client id, used to get TC M2M token
• AUTH0_CLIENT_SECRET: Auth0 client secret, used to get TC M2M token
• AUTH0_PROXY_SERVER_URL: Proxy Auth0 URL, used to get TC M2M token
• V5_CHALLENGE_API_URL: v5 challenge api url, default value is 'http://localhost:4000/v5/challenges'
• V5_CHALLENGE_TYPE_API_URL: v5 challenge type api url, default value is 'http://localhost:4000/v5/challengeTypes'
• INFORMIX: Informix database configuration parameters, refer config/default.js for more information

There is a /health endpoint that checks for the health of the app. This sets up an expressjs server and listens on the environment variable PORT. It's not part of the configuration file and needs to be passed as an environment variable

Configuration for the tests is at config/test.js, only add such new configurations different from config/default.js

• MOCK_API_PORT: the mock server port, default is 4000
• WAIT_TIME: wait time used in test, default is 1500 or 1.5 second
• V4_CHALLENGE_API_URL: the v4 challenge api url, used mock v4 challenge api in testing

Local Kafka setup

• http://kafka.apache.org/quickstart contains details to setup and manage Kafka server, below provides details to setup Kafka server in Linux/Mac, Windows will use bat commands in bin/windows instead

• download kafka at https://www.apache.org/dyn/closer.cgi?path=/kafka/1.1.0/kafka_2.11-1.1.0.tgz

• extract out the downloaded tgz file

• go to extracted directory kafka_2.11-0.11.0.1

• start ZooKeeper server: bin/zookeeper-server-start.sh config/zookeeper.properties

• use another terminal, go to same directory, start the Kafka server: bin/kafka-server-start.sh config/server.properties

• note that the zookeeper server is at localhost:2181, and Kafka server is at localhost:9092

• use another terminal, go to same directory, create the needed topics: bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic challenge.notification.create

  bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic challenge.notification.update

• verify that the topics are created: bin/kafka-topics.sh --list --zookeeper localhost:2181, it should list out the created topics

• run the producer and then write some message into the console to send to the challenge.notification.create topic: bin/kafka-console-producer.sh --broker-list localhost:9092 --topic challenge.notification.create in the console, write message, one message per line: { "topic": "challenge.notification.create", "originator": "challenge-api", "timestamp": "2019-05-14T00:00:00.000Z", "mime-type": "application/json", "payload": { "id": "1a4ef3a8-ed35-40d1-b8a6-7371a700d011", "typeId": "2f4ef3a8-ed35-40d1-b8a6-7371a700d098", "track": "CODE", "name": "test-for-legacy-challenge-processor", "description": "<p>test</p>", "phases": [{ "id": "id-1", "name": "registration", "isActive": true, "duration": 345600000 }, { "id": "id-2", "name": "submission", "isActive": true, "duration": 345600000 }, { "id": "id-3", "name": "checkpoint", "isActive": true, "duration": 172800000 } ], "prizeSets": [{ "type": "Code", "prizes": [{ "type": "first-place", "value": 1000 }, { "type": "second-place", "value": 500 }] }, { "type": "Check Point", "prizes": [{ "type": "first-place", "value": 200 }, { "type": "second-place", "value": 200 }, { "type": "third-place", "value": 200 }] }], "reviewType": "COMMUNITY", "markdown": false, "tags": ["Node.js", "NodeJS", "MongoDB", "AWS"], "projectId": 5087, "forumId": 33059 } }

• optionally, use another terminal, go to same directory, start a consumer to view the messages: bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic challenge.notification.create --from-beginning

• writing/reading messages to/from other topics are similar

Topcoder Informix Database Setup

We will use Topcoder Informix database setup on Docker.

Go to docker-ifx folder and run docker-compose up After the database has initialized, You can use a database GUI tool(example DBeaver) to run the sql script docker-ifx/update.sql.

Mock V5 Challenge API

Mock V5 challenge api is under test/mock folder. You can use command npm run mock-api to start the server.

Local deployment

• Given the fact that the library used to access Informix DB depends on Informix Client SDK. We will run the application on Docker using a base image with Informix Client SDK installed and properly configured. For deployment, please refer to next section 'Local Deployment with Docker'

Local Deployment with Docker

1. Make sure that Kafka, mock server and Informix are running as per instructions above.

2. Go to docker folder

3. Rename the file sample.api.env to api.env And properly update the IP addresses to match your environment for the variables : KAFKA_URL, INFORMIX_HOST and V5_CHALLENGE_TYPE_API_URL( make sure to use IP address instead of hostname ( i.e localhost will not work)).Here is an example:

KAFKA_URL=192.168.31.8:9092
INFORMIX_HOST=192.168.31.8
V5_CHALLENGE_TYPE_API_URL=http://192.168.31.8:4000/v5/challengeTypes

4. Once that is done, go to run the following command

docker-compose up

5. When you are running the application for the first time, It will take some time initially to download the image and install the dependencies

Verification

Refer Verification.md