Description

This Library should handle all interactions between kafka and couch

Data Asumptions,

It Monitor's created and updated,

• Created assume's no document exists, and creates a new one
• Updated assumes Document exits
• message has an id field, that is the id for the document

#Usage

import { taskSchema } from "bf-legal-task";
import { KafkaCouchWatcher } from "lib-kafkacouch";
const TaskWatcher = new KafkaCouchWatcher({
  subject: "task",
  couch: `workflow-task_management`,
  kafka: { topic: `WORKFLOW.TASK_MANAGEMENT`, groupId: "app-asdf" },
  bodyValidation: taskSchema,
  id: "id",
  filter: (body, type, header) => {
    return true;
  },
  map: (body, type, header) => {
    return body;
  }
});
//After a commit happens
TaskWatcher.on("updated", async (body, type, header) => {
  console.log(packet);
});

Without couch ( for command's ext... )

import { taskSchema } from "bf-legal-task";
import { KafkaCouchWatcher } from "lib-kafkacouch";
const TaskWatcher = new KafkaCouchWatcher({
  subject: "task",
  couch: false,
  kafka: { topic: `WORKFLOW.TASK_MANAGEMENT`, groupId: "app-asdf" },
  bodyValidation: taskSchema,
  filter: (body, type, header) => {
    return true;
  },
  map: (body, type, header) => {
    return body;
  }
});
//After a commit happens
TaskWatcher.on("updated", async (body, type, header) => {
  console.log(packet);
});

Config Stuff

Couch by default get's it's creds from enviromental variables

const COUCH_USER: string = process.env.COUCH_USER || "admin";
const COUCH_PASSWORD: string = process.env.COUCH_PASSWORD || "password";
const COUCH_PORT: string = process.env.COUCH_PORT || "5984";
const COUCH_HOST: string = process.env.COUCH_HOST || "couchdb";
const COUCH_PROTO: string = process.env.COUCH_PROTO || "http";

KafkaCouchWatcher.kafka

| Key | Description | Required | | ------------------------ | ----------------------------------- | -------- | | topic | Kafka Topic | true | | groupId | Group ID ( for Round Robin Groups ) | true | | host | Kafka Host | false | | sessionTimeout | | false | | protocol | | false | | fromOffset | | false | | protocol | | false | | commitOffsetsOnFirstJoin | | false | | outOfRangeOffset | | false | | onRebalance | | false |

const k = {
  topic: `WORKFLOW.TASK_MANAGEMENT`,
  host: process.env.ZOOKEEPER_HOST || "zookeeper:2181",
  groupId: process.env.KAFKA_GROUP_ID || "default-groupa",
  sessionTimeout: 15000,
  protocol: ["roundrobin"],
  fromOffset: "earliest",
  commitOffsetsOnFirstJoin: true,
  outOfRangeOffset: "earliest",
  onRebalance: (isAlreadyMember: any, callback: any) => {
    callback();
  } // or null
};