zookeeper-cluster-client

Sharing one zookeeper connection among Multi-Process on Node.js

zookeeper-cluster-client

Support cluster-client process model on node-zookeeper-client.

Install

npm i zookeeper-cluster-client --save

Usage

1. Create a node using given path:

const zookeeper = require('zookeeper-cluster-client');
const client = zookeeper.createClient('localhost:2181');
const path = process.argv[2];

client.once('connected', async function() {
  await client.create(path);
  console.log('Node: %s is successfully created.', path);
  await client.close();
});

client.connect();

2. List and watch the children of given node:

const zookeeper = require('zookeeper-cluster-client');
const client = zookeeper.createClient('localhost:2181');
const path = process.argv[2];

async function listChildren(client, path) {
  const children = await client.getChildren(
    path,
    event => {
      console.log('Got watcher event: %s', event);
      listChildren(client, path);
    });
  console.log('Children of %s are: %j.', path, children);
}

client.once('connected', () => {
  console.log('Connected to ZooKeeper.');
  listChildren(client, path);
});

client.connect();

Support APIs

  • createClient(connectionString, [options])
  • connect()
  • close(): return promise
  • async create(path, [data], [acls], [mode])
  • async remove(path, [version])
  • async setData(path, data, [version])
  • async getACL(path, [options])
  • async setACL(path, acls, [version])
  • async mkdirp(path, [data], [acls], [mode])
  • async exists(path, [watcher])
  • async getChildren(path, [watcher], [options])
  • async getData(path, [watcher], [options])
  • addAuthInfo(scheme, auth)
  • State getState()
  • Buffer getSessionId()
  • Buffer getSessionPassword()
  • Number getSessionTimeout()
  • transaction()

Extends APIs

Provides some useful APIs beyond node-zookeeper-client.

  • watch(path, listener)

    client.watch('/foo', (err, data, stat) => {
      if (err) {
        // handle error
        return;
      }
      console.log('data => %s', data.toString());
      console.log('stat => %s', stat);
    });
  • watchChildren(path, listener)

    client.watchChildren('/foo', (err, children, stat) => {
      if (err) {
        // handle error
        return;
      }
      console.log('children => %j', children);
      console.log('stat => %s', stat);
    });

License

MIT

Repository

https@github.com:node-modules/zookeeper-cluster-client


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