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rethinkdb-changefeed-reconnect

v0.3.2

Published

automatically reconnect changefeed processors when connection is lost

Downloads

1,695

Readme

rethinkdb-changefeed-reconnect

Code Climate GPA Code Climate Issue Count Test Coverage

Simple helper module for having RethinkDB changefeed listeners automatically reconnect if they lose their connection (i.e., if the database server goes down or restarts).

Right now, there is a single (default) function exported: processChangeFeedWithAutoReconnect.

Getting Started

  1. Install the module in your project

     $ npm install --save rethinkdb-changefeed-reconnect

How to Use

Basically, you need to implement 3 functions and configure your options:

  1. getFeed(): this should return a RethinkDB .changes() query Promise
  2. onFeedItem(item): this is the function that processes each new data item
  3. onError(err): this function is where errors will be sent

The available options are:

  • changefeedName: used for logging purposes so you can differentiate your different feeds
  • attemptDelay: how long (in milliseconds) to wait between reconnect attempts
  • maxAttempts: how many reconnect attempts to try before giving up
  • silent: whether or not you want the logger to be silenced (default = false)
  • logger: must be an object with 4 functions: log, info, warn, and error (default = global.console)

Example

import rethinkdbdash from 'rethinkdbdash'
import processChangefeed from 'rethinkdb-changefeed-reconnect'

const r = rethinkdbdash({servers: {host: 'localhost', port: 28015, db: 'todo'}, silent: true})

processChangefeed(newTasksFeed, handleNewTask, handleError, {
  changefeedName: 'my changefeed',
  attemptDelay: 3000,
  maxAttempts: 3,
  silent: false,
  logger: global.console,
})

function newTasksFeed() {
  r.table('tasks')
    .changes()
    .filter(r.row('old_val').eq(null))
}

function handleNewTask(task) {
  console.log({task})
}

function handleError(err) {
  console.error(err.stack)
}

See also the provided example.

You can run it like so: node example

Then, after you run it, stop your RethinkDB server and watch what gets logged (assuming you passed silent: false in your options).

Notes

This module was developed on top of rethinkdbdash.

Contributing

Read the instructions for contributing.

  1. Clone the repository.

  2. Run the setup tasks:

     $ npm install
     $ npm test

License

See the LICENSE file.