hive-io-domain-example

hive-io-domain-example

An example CQRS/ES domain module to help describe implementation details when leveraging the Hive^io framework.

Contents

• Overview
  • Endpoints
  • Source Code
• Getting Started
  • Prerequisites
  • Installing
  • Environment Variables

Overview

This example evolves the previous hive-io-rest-example into a highly distributed architecture in order to handle different magnitudes of network traffic for viewed metrics and text management. It is a contrived but slightly more robust example to illustrate different ways to use Actors in the Hive^io framework.

Endpoints

Once you get the app running using the setup instructions below, you can use the application from the following endpoint(s):

• http://localhost/contents (GET, POST)
  • POST API JSON Schema

    {
      "text": "something"
    }
    

• http://localhost/contents/<id> (GET, PATCH, DELETE)
  • PATCH API JSON Schema

    {
      "text": "something different"
    }
    

  • DELETE

NOTE: Network data models follow the Flux Standard Action specification for network transport. type and payload are derived from the routes and data sent respectively in this example.

Source Code

Getting Started

This is a straight forward CQRS/ES example of a Content Entity that contains text, a couple Boolean flags, and a count of how many views it has. It is a highly distributed application with the expectation that viewed traffic will be much larger than text management traffic. It stores these Contents in MongoDB. It leverages Hive^io's built-in telemetry solution with OpenTelemetry. Here's how to use it.

NOTE: This does not include error handling, authentication, and other strategies to keep the example straight forward.

Prerequisites

To use, you'll need:

• Required
  • Docker
  • Docker Compose
  • Proxy/Load Balancer (HAProxy)

Installing

To start using:

1. Create the following files:
   • Producer.dockerfile

     FROM fnalabs/hive-producer-js:latest
     RUN npm install hive-io-domain-example
     

   • Stream-Processor.dockerfile

     FROM fnalabs/hive-stream-processor-js:latest
     RUN npm install hive-io-domain-example
     

   • Consumer.dockerfile

     FROM fnalabs/hive-consumer-js:latest
     RUN npm install hive-io-domain-example
     

   • Rest.dockerfile

     FROM fnalabs/hive-base-js:latest
     RUN npm install hive-io-domain-example
     

   • docker-compose.yml

     version: '3.5'
     services:
       # proxy for layer 7 routing
       # NOTE: this is an example, you will need to define your own config
       #       ex. https://github.com/fnalabs/hive-io/tree/master/dev/proxy
       proxy:
         image: haproxy:2.3.2-alpine
         container_name: proxy
         depends_on:
           - hive-base-js
           - hive-stream-processor-js
         ports:
           - 80:80
         networks:
           - hive-io
         restart: on-failure
     
       # producers
       hive-producer-js:
         build:
           context: .
           dockerfile: Producer.dockerfile
         image: hive-producer-js:production
         container_name: hive-producer-js
         environment:
           ACTOR: ViewContentActor
           ACTOR_LIB: hive-io-domain-example
           ACTOR_URLS: "/contents/:id"
           CLUSTER_SIZE: 1
           HTTP_VERSION: 1
           SECURE: "false"
           TELEMETRY: "true"
           TELEMETRY_URL_METRICS: "http://collector:55681/v1/metrics"
           TELEMETRY_URL_TRACES: "http://collector:55681/v1/trace"
           EVENT_STORE_TOPIC: view
           EVENT_STORE_BROKERS: "kafka:29092"
           EVENT_STORE_ID: producer-client
         depends_on:
           - collector
           - kafka
         networks:
           - hive-io
     
       # stream processors
       hive-stream-processor-js:
         build:
           context: .
           dockerfile: Stream-Processor.dockerfile
         image: hive-stream-processor-js:production
         container_name: hive-stream-processor-js
         environment:
           ACTOR: ContentCommandActor
           ACTOR_LIB: hive-io-domain-example
           ACTOR_URLS: "/contents,/contents/:id"
           CLUSTER_SIZE: 1
           HTTP_VERSION: 1
           SECURE: "false"
           TELEMETRY: "true"
           TELEMETRY_URL_METRICS: "http://collector:55681/v1/metrics"
           TELEMETRY_URL_TRACES: "http://collector:55681/v1/trace"
           CACHE_URL: "redis://redis:6379"
           EVENT_STORE_PRODUCER_TOPIC: content
           EVENT_STORE_BROKERS: "kafka:29092"
           EVENT_STORE_ID: stream-processor-client
         depends_on:
           - collector
           - kafka
           - redis
         networks:
           - hive-io
       redis:
         image: redis:6.0.9-alpine
         container_name: redis
         networks:
           - hive-io
         restart: on-failure
     
       # log stream containers
       kafka:
         image: confluentinc/cp-kafka:5.4.3
         container_name: kafka
         depends_on:
           - zookeeper
         environment:
           KAFKA_ZOOKEEPER_CONNECT: "zookeeper:32181"
           KAFKA_ADVERTISED_LISTENERS: "PLAINTEXT://kafka:29092"
           KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
           KAFKA_COMPRESSION_TYPE: gzip
         expose:
           - 29092
         networks:
           - hive-io
         restart: on-failure
       zookeeper:
         image: confluentinc/cp-zookeeper:5.4.3
         container_name: zookeeper
         environment:
           ZOOKEEPER_CLIENT_PORT: 32181
         expose:
           - 32181
         networks:
           - hive-io
         restart: on-failure
     
       # consumers
       hive-consumer-js:
         build:
           context: .
           dockerfile: Consumer.dockerfile
         image: hive-consumer-js:production
         container_name: hive-consumer-js
         environment:
           ACTOR: ContentEventActor
           ACTOR_LIB: hive-io-domain-example
           CLUSTER_SIZE: 1
           HTTP_VERSION: 1
           SECURE: "false"
           TELEMETRY: "true"
           TELEMETRY_PLUGINS: '{"mongodb":{"enabled":true,"path":"@opentelemetry/plugin-mongodb"},"mongoose":{"enabled":true,"path":"@wdalmut/opentelemetry-plugin-mongoose"}}'
           TELEMETRY_URL_METRICS: "http://collector:55681/v1/metrics"
           TELEMETRY_URL_TRACES: "http://collector:55681/v1/trace"
           EVENT_STORE_TOPIC: "content|view"
           EVENT_STORE_BROKERS: "kafka:29092"
           EVENT_STORE_ID: consumer-client
           EVENT_STORE_GROUP_ID: consumer-group
           EVENT_STORE_FROM_START: "true"
           MONGO_URL: "mongodb://mongo:27017/content"
         depends_on:
           - collector
           - kafka
           - mongo
         networks:
           - hive-io
       mongo:
         image: mongo:4.4.2
         networks:
           - hive-io
         restart: on-failure
     
       # rest services
       hive-base-js:
         build:
           context: .
           dockerfile: Rest.dockerfile
         image: hive-base-js:production
         container_name: hive-base-js
         environment:
           ACTOR: ContentQueryActor
           ACTOR_LIB: hive-io-domain-example
           ACTOR_URLS: "/contents,/contents/:id"
           CLUSTER_SIZE: 1
           HTTP_VERSION: 1
           SECURE: "false"
           TELEMETRY: "true"
           TELEMETRY_PLUGINS: '{"mongodb":{"enabled":true,"path":"@opentelemetry/plugin-mongodb"},"mongoose":{"enabled":true,"path":"@wdalmut/opentelemetry-plugin-mongoose"}}'
           TELEMETRY_URL_METRICS: "http://collector:55681/v1/metrics"
           TELEMETRY_URL_TRACES: "http://collector:55681/v1/trace"
           MONGO_URL: "mongodb://mongo:27017/content"
         depends_on:
           - collector
           - hive-producer-js
           - mongo
         networks:
           - hive-io
     
       # Tracing
       collector:
         # NOTE: this is an example, you will need to define your own config
         #       ex. https://github.com/fnalabs/hive-io/tree/master/dev/collector
         image: otel/opentelemetry-collector:0.16.0
         container_name: collector
         command: ["--config=/conf/collector-config.yml", "--log-level=WARN"]
         depends_on:
           - zipkin
         networks:
           - hive-io
         restart: on-failure
       zipkin:
         image: openzipkin/zipkin:2.23.1
         container_name: zipkin
         ports:
           - 9411:9411
         networks:
           - hive-io
         restart: on-failure
     
     # networking specifics
     networks:
       hive-io:
         driver: bridge
     

2. Run the following commands:

   docker-compose up
   

NOTE: There is a chicken or egg scenario when you run this example for the first time. In this example, the topics are not created until events are sent from hive-producer-js and hive-stream-processor-js. Therefore, you will need to restart hive-consumer-js after the topics are created to finally see events flow through the system.

Environment Variables

The table below contains a reference to the custom environment variables used in the example. Standard environment variables are documented for all service containers.

Name	Type	Default	Description
MONGO_URL	String	'mongodb://mongo:27017/post'	url to connect to MongoDB instance